From 0b629eae7a518d5b735a0f34519dcb85ad5fb996 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mika=C3=ABl=20Mayer?= <MikaelMayer@users.noreply.github.com>
Date: Mon, 29 Apr 2024 16:53:15 -0500
Subject: [PATCH] Feat rust operators (#5380)

This PR is a replay of https://github.com/dafny-lang/dafny/pull/5081
after fixing the issue with the paths too long for Windows, so it should
no longer break the CI.

### Description
This PR implements most immutable types in Dafny (Sequence, Set,
Multiset, Map) and implements most if not all operators on them. It also
sets an architecture that can now be relied on.
List of features in this PR:
- More comprehensive Rust AST, precedence and associativity to render
parentheses
- The Rust compiler no longer crash when not in /runAllTests, but emits
invalid code. It makes it possible to see which features are missing by
searching for `<i>` in the generated code.
- Made verification of GenExpr less brittle
- Previous PR review comments
- Ability to use shadowed identifiers to avoid numbers in names. Rust
has the same rules as Dafny for shadowing, and I will continue to
monitor cases where semantics might differ.

### How has this been tested?
I added an integration test for compiling Dafny to Rust, and I added
unit tests for the runtime in Rust
*All tests for each compiler now have a `.rs.check` if they fail.*.

<small>By submitting this pull request, I confirm that my contribution
is made under the terms of the [MIT
license](https://github.com/dafny-lang/dafny/blob/master/LICENSE.txt).</small>

---------

Co-authored-by: Robin Salkeld <salkeldr@amazon.com>
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 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-684.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-686.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697b.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697d.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697e.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697f.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697g.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697j.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697k.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-698.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-698b.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-701.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-731.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-731b.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-784.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-817.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-817a.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-859.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-864rr.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-953.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-2928.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-3766-a.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-3766-b.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-3766-c.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-3871.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-3874.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-4483.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/hofs/Compilation.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/hofs/Fold.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/hofs/Renaming.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/hofs/TreeMapSimple.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/hofs/VectorUpdate.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/hofs/WhileLoop.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/metatests/ConsistentWhenSupported.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/metatests/OutputEncoding.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/patterns/OrPatterns.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/patterns/PatternMatching.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/stdlibs/StandardLibraries.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/traits/GeneralTraitsCompile.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/traits/NonReferenceTraitsCompile.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/traits/TraitCompile.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/traits/TraitExample.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/traits/Traits-Fields.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/traits/TraitsMultipleInheritance.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodechars/comp/Arrays.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodechars/comp/Collections.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodechars/comp/Comprehensions.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodechars/comp/NativeNumbers.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodechars/comp/Numbers.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodechars/git-issues/github-issue-2928.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodecharsFalse/comp/Collections.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodecharsFalse/comp/Comprehensions.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodecharsFalse/comp/NativeNumbers.dfy.rs.check
 create mode 100644 Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodecharsFalse/git-issues/github-issue-2928.dfy.rs.check
 create mode 100644 docs/DafnyRef/integration- rust/IntegrationRust.md
 create mode 100644 docs/dev/news/5081.feat

diff --git a/.github/workflows/msbuild.yml b/.github/workflows/msbuild.yml
index ee69aec54c3..41fc5b53520 100644
--- a/.github/workflows/msbuild.yml
+++ b/.github/workflows/msbuild.yml
@@ -37,7 +37,7 @@ jobs:
       run: dotnet tool restore
     - name: Check whitespace and style
       working-directory: dafny
-      run: dotnet format whitespace Source/Dafny.sln --verify-no-changes --exclude Source/DafnyCore/Scanner.cs --exclude Source/DafnyCore/Parser.cs --exclude Source/DafnyCore/GeneratedFromDafny.cs --exclude Source/DafnyRuntime/DafnyRuntimeSystemModule.cs
+      run: dotnet format whitespace Source/Dafny.sln --verify-no-changes --exclude Source/DafnyCore/Scanner.cs --exclude Source/DafnyCore/Parser.cs --exclude Source/DafnyCore/GeneratedFromDafny/* --exclude Source/DafnyCore.Test/GeneratedFromDafny/* --exclude Source/DafnyRuntime/DafnyRuntimeSystemModule.cs
     - name: Get Boogie Version
       run: |
         sudo apt-get update
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 9c4a8290fd2..daba3a64a4d 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -4,5 +4,5 @@ repos:
     -   id: dotnet-format
         name: dotnet-format
         language: system
-        entry: dotnet format whitespace Source/Dafny.sln --include
+        entry: dotnet format whitespace Source/Dafny.sln -v:d --include 
         types_or: ["c#"]
diff --git a/Makefile b/Makefile
index d6256e00c2e..45248b3bf74 100644
--- a/Makefile
+++ b/Makefile
@@ -17,7 +17,7 @@ dfyprod: dfyprodformat dfyprodinit
 	(cd "${DIR}" ; dotnet build Source/Dafny.sln ) ## includes parser
 
 dfydevinit:
-	(cd "${DIR}"/Source/DafnyCore ; bash DafnyGeneratedFromDafny.sh --no-verify --no-format)
+	(cd "${DIR}"/Source/DafnyCore ; bash DafnyGeneratedFromDafny.sh --no-verify)
 
 dfydev: dfydevinit
 	(cd "${DIR}" ; dotnet build Source/Dafny.sln ) ## includes parser
@@ -73,7 +73,7 @@ z3-ubuntu:
 	chmod +x ${DIR}/Binaries/z3/bin/z3-*
 
 format:
-	dotnet format whitespace Source/Dafny.sln --exclude Source/DafnyCore/Scanner.cs --exclude Source/DafnyCore/Parser.cs --exclude boogie --exclude Source/DafnyCore/GeneratedFromDafny.cs --exclude Source/DafnyRuntime/DafnyRuntimeSystemModule.cs
+	dotnet format whitespace Source/Dafny.sln --exclude Source/DafnyCore/Scanner.cs --exclude Source/DafnyCore/Parser.cs --exclude boogie --exclude Source/DafnyCore/GeneratedFromDafny/* --exclude Source/DafnyCore.Test/GeneratedFromDafny/* --exclude Source/DafnyRuntime/DafnyRuntimeSystemModule.cs
 
 clean:
 	(cd ${DIR}; cd Source; rm -rf Dafny/bin Dafny/obj DafnyDriver/bin DafnyDriver/obj DafnyRuntime/obj DafnyRuntime/bin DafnyServer/bin DafnyServer/obj DafnyPipeline/obj DafnyPipeline/bin DafnyCore/obj DafnyCore/bin)
diff --git a/Source/DafnyCore.Test/GeneratedDafnyTest.cs b/Source/DafnyCore.Test/GeneratedDafnyTest.cs
new file mode 100644
index 00000000000..72600e6f7c6
--- /dev/null
+++ b/Source/DafnyCore.Test/GeneratedDafnyTest.cs
@@ -0,0 +1,11 @@
+using System.Collections.Concurrent;
+using Microsoft.Dafny;
+
+namespace DafnyCore.Test;
+
+public class GeneratedDafnyTest {
+  [Fact]
+  public void TestDafnyGeneratedCode() {
+    DafnyToRustCompilerCoverage.RASTCoverage.__default.TestExpr();
+  }
+}
\ No newline at end of file
diff --git a/Source/DafnyCore.Test/GeneratedFromDafny/DafnyToRustCompilerCoverage_RASTCoverage.cs b/Source/DafnyCore.Test/GeneratedFromDafny/DafnyToRustCompilerCoverage_RASTCoverage.cs
new file mode 100644
index 00000000000..015267d20c0
--- /dev/null
+++ b/Source/DafnyCore.Test/GeneratedFromDafny/DafnyToRustCompilerCoverage_RASTCoverage.cs
@@ -0,0 +1,162 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace DafnyToRustCompilerCoverage.RASTCoverage {
+
+  public partial class __default {
+    public static void TestNoOptimize(RAST._IExpr e)
+    {
+    }
+    public static void TestOptimizeToString()
+    {
+      RAST._IExpr _1833_x;
+      _1833_x = RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x"));
+      RAST._IExpr _1834_y;
+      _1834_y = RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("y"));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_UnaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), RAST.Expr.create_Call(RAST.Expr.create_Select(_1833_x, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("clone")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements()), DAST.Format.UnaryOpFormat.create_NoFormat())).Optimize(), RAST.Expr.create_UnaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), _1833_x, DAST.Format.UnaryOpFormat.create_NoFormat())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.TestNoOptimize(RAST.Expr.create_UnaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), RAST.Expr.create_Call(RAST.Expr.create_Select(_1833_x, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("clone")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_1834_y)), DAST.Format.UnaryOpFormat.create_NoFormat()));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_UnaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!"), RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("=="), _1833_x, _1834_y, DAST.Format.BinaryOpFormat.create_NoFormat()), DAST.Format.UnaryOpFormat.create_CombineFormat())).Optimize(), RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!="), _1833_x, _1834_y, DAST.Format.BinaryOpFormat.create_NoFormat())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_UnaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!"), RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _1833_x, _1834_y, DAST.Format.BinaryOpFormat.create_NoFormat()), DAST.Format.UnaryOpFormat.create_CombineFormat())).Optimize(), RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">="), _1833_x, _1834_y, DAST.Format.BinaryOpFormat.create_NoFormat())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_UnaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!"), RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _1833_x, _1834_y, DAST.Format.BinaryOpFormat.create_ReverseFormat()), DAST.Format.UnaryOpFormat.create_CombineFormat())).Optimize(), RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<="), _1834_y, _1833_x, DAST.Format.BinaryOpFormat.create_NoFormat())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_ConversionNum(RAST.Type.create_I128(), RAST.Expr.create_Call(RAST.Expr.create_MemberSelect(RAST.Expr.create_MemberSelect(RAST.Expr.create_MemberSelect(RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("dafny_runtime")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("DafnyInt")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("from")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(RAST.Expr.create_LiteralInt(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("1")))))).Optimize(), RAST.Expr.create_LiteralInt(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/*optimized*/1"))));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_ConversionNum(RAST.Type.create_I128(), RAST.Expr.create_Call(RAST.Expr.create_MemberSelect(RAST.Expr.create_MemberSelect(RAST.Expr.create_MemberSelect(RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("dafny_runtime")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("DafnyInt")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("from")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(RAST.Expr.create_LiteralString(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("1"), false))))).Optimize(), RAST.Expr.create_LiteralInt(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/*optimized*/1"))));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.TestNoOptimize((RAST.Expr.create_ConversionNum(RAST.Type.create_I128(), RAST.Expr.create_Call(RAST.Expr.create_MemberSelect(RAST.Expr.create_MemberSelect(RAST.Expr.create_MemberSelect(RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("dafny_runtime")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("DafnyInt")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("from")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_1833_x)))).Optimize());
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.TestNoOptimize((RAST.Expr.create_ConversionNum(RAST.Type.create_I128(), RAST.Expr.create_Call(RAST.Expr.create_MemberSelect(RAST.Expr.create_MemberSelect(RAST.Expr.create_MemberSelect(RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("dafny_runtime")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("DafnyInt")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("from")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(RAST.Expr.create_LiteralInt(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("1")), RAST.Expr.create_LiteralInt(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("2")))))).Optimize());
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.TestNoOptimize(RAST.Expr.create_ConversionNum(RAST.Type.create_I128(), _1833_x));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_StmtExpr(RAST.Expr.create_DeclareVar(RAST.DeclareType.create_MUT(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("z"), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_I128()), Std.Wrappers.Option<RAST._IExpr>.create_None()), RAST.Expr.create_StmtExpr(RAST.Expr.create_AssignVar(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("z"), _1834_y), RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("return"))))).Optimize(), RAST.Expr.create_StmtExpr(RAST.Expr.create_DeclareVar(RAST.DeclareType.create_MUT(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("z"), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_I128()), Std.Wrappers.Option<RAST._IExpr>.create_Some(_1834_y)), RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("return")))));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.TestNoOptimize(RAST.Expr.create_StmtExpr(RAST.Expr.create_DeclareVar(RAST.DeclareType.create_MUT(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("z"), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_I128()), Std.Wrappers.Option<RAST._IExpr>.create_None()), RAST.Expr.create_StmtExpr(RAST.Expr.create_AssignVar(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("w"), _1834_y), RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("return")))));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.TestNoOptimize(_1833_x);
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.TestNoOptimize(RAST.Expr.create_StmtExpr(_1833_x, _1833_x));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.TestNoOptimize(RAST.Expr.create_StmtExpr(RAST.Expr.create_Match(_1833_x, Dafny.Sequence<RAST._IMatchCase>.FromElements()), _1833_x));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.TestNoOptimize(RAST.Expr.create_StmtExpr(RAST.Expr.create_StructBuild(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x"), Dafny.Sequence<RAST._IAssignIdentifier>.FromElements()), _1833_x));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.TestNoOptimize(RAST.Expr.create_StmtExpr(RAST.Expr.create_Tuple(Dafny.Sequence<RAST._IExpr>.FromElements()), _1833_x));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.TestNoOptimize(RAST.Expr.create_StmtExpr(RAST.Expr.create_UnaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), _1833_x, DAST.Format.UnaryOpFormat.create_NoFormat()), _1833_x));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.TestNoOptimize(RAST.Expr.create_StmtExpr(RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&&"), _1833_x, _1833_x, DAST.Format.BinaryOpFormat.create_NoFormat()), _1833_x));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.TestNoOptimize(RAST.Expr.create_StmtExpr(RAST.Expr.create_TypeAscription(_1833_x, RAST.Type.create_I128()), _1833_x));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.TestNoOptimize(RAST.Expr.create_StmtExpr(RAST.Expr.create_LiteralInt(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("1")), _1833_x));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.TestNoOptimize(RAST.Expr.create_StmtExpr(RAST.Expr.create_LiteralString(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("1"), true), _1833_x));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.TestNoOptimize(RAST.Expr.create_StmtExpr(RAST.Expr.create_ConversionNum(RAST.Type.create_I128(), _1833_x), _1833_x));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_StmtExpr(RAST.Expr.create_DeclareVar(RAST.DeclareType.create_MUT(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("z"), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_I128()), Std.Wrappers.Option<RAST._IExpr>.create_None()), RAST.Expr.create_StmtExpr(RAST.Expr.create_AssignVar(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("z"), _1834_y), RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("return"))))).Optimize(), RAST.Expr.create_StmtExpr(RAST.Expr.create_DeclareVar(RAST.DeclareType.create_MUT(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("z"), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_I128()), Std.Wrappers.Option<RAST._IExpr>.create_Some(_1834_y)), RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("return")))));
+      Dafny.ISequence<RAST._IExpr> _1835_coverageExpression;
+      _1835_coverageExpression = Dafny.Sequence<RAST._IExpr>.FromElements(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("abc")), RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x")), RAST.Expr.create_Match(RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x")), Dafny.Sequence<RAST._IMatchCase>.FromElements(RAST.MatchCase.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("abc"), RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x"))))), RAST.Expr.create_StmtExpr(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("panic!()")), RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("a"))), RAST.Expr.create_Block(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("abc"))), RAST.Expr.create_StructBuild(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("dummy"), Dafny.Sequence<RAST._IAssignIdentifier>.FromElements(RAST.AssignIdentifier.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("foo"), RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("bar"))))), RAST.Expr.create_StructBuild(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("dummy"), Dafny.Sequence<RAST._IAssignIdentifier>.FromElements(RAST.AssignIdentifier.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("foo"), RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("bar"))), RAST.AssignIdentifier.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("foo2"), RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("bar"))))), RAST.Expr.create_Tuple(Dafny.Sequence<RAST._IExpr>.FromElements(RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x")))), RAST.Expr.create_UnaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("-"), RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x")), DAST.Format.UnaryOpFormat.create_NoFormat()), RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("+"), RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x")), RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("y")), DAST.Format.BinaryOpFormat.create_NoFormat()), RAST.Expr.create_TypeAscription(RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x")), RAST.Type.create_I128()), RAST.Expr.create_LiteralInt(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("322")), RAST.Expr.create_LiteralString(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("abc"), true), RAST.Expr.create_LiteralString(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("abc"), false), RAST.Expr.create_ConversionNum(RAST.Type.create_I128(), RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x"))), RAST.Expr.create_ConversionNum(RAST.__default.RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("X")), RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x"))), RAST.Expr.create_DeclareVar(RAST.DeclareType.create_MUT(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("abc"), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_I128()), Std.Wrappers.Option<RAST._IExpr>.create_None()), RAST.Expr.create_DeclareVar(RAST.DeclareType.create_CONST(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("abc"), Std.Wrappers.Option<RAST._IType>.create_None(), Std.Wrappers.Option<RAST._IExpr>.create_Some(RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x")))), RAST.Expr.create_AssignVar(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("abc"), RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x"))), RAST.Expr.create_IfExpr(RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x")), RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x")), RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x"))), RAST.Expr.create_Loop(Std.Wrappers.Option<RAST._IExpr>.create_Some(RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x"))), RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x"))), RAST.Expr.create_For(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("abc"), RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x")), RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x"))), RAST.Expr.create_Labelled(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("abc"), RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x"))), RAST.Expr.create_Break(Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None()), RAST.Expr.create_Break(Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_Some(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("l"))), RAST.Expr.create_Continue(Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None()), RAST.Expr.create_Continue(Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_Some(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("l"))), RAST.Expr.create_Return(Std.Wrappers.Option<RAST._IExpr>.create_None()), RAST.Expr.create_Return(Std.Wrappers.Option<RAST._IExpr>.create_Some(RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x")))), RAST.Expr.create_Call(RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements()), RAST.Expr.create_Call(RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x")), Dafny.Sequence<RAST._IType>.FromElements(RAST.Type.create_I128(), RAST.Type.create_I32()), Dafny.Sequence<RAST._IExpr>.FromElements(RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x")), RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("y")))), RAST.Expr.create_Select(RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("abc")), RAST.Expr.create_MemberSelect(RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("abc")));
+      BigInteger _hi4 = new BigInteger((_1835_coverageExpression).Count);
+      for (BigInteger _1836_i = BigInteger.Zero; _1836_i < _hi4; _1836_i++) {
+        RAST._IExpr _1837_c;
+        _1837_c = (_1835_coverageExpression).Select(_1836_i);
+        RAST._IPrintingInfo _1838___v0;
+        _1838___v0 = (_1837_c).printingInfo;
+        RAST._IExpr _1839___v1;
+        _1839___v1 = (_1837_c).Optimize();
+        Dafny.IMap<RAST._IExpr,Dafny.ISequence<Dafny.Rune>> _1840___v2;
+        _1840___v2 = Dafny.Map<RAST._IExpr, Dafny.ISequence<Dafny.Rune>>.FromElements(new Dafny.Pair<RAST._IExpr, Dafny.ISequence<Dafny.Rune>>(_1837_c, (_1837_c)._ToString(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))));
+        RAST._IExpr _1841___v3;
+        _1841___v3 = (RAST.Expr.create_StmtExpr(RAST.Expr.create_DeclareVar(RAST.DeclareType.create_MUT(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("abc"), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_I128()), Std.Wrappers.Option<RAST._IExpr>.create_None()), _1837_c)).Optimize();
+        RAST._IExpr _1842___v4;
+        _1842___v4 = (RAST.Expr.create_StmtExpr(RAST.Expr.create_DeclareVar(RAST.DeclareType.create_MUT(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("abc"), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_I128()), Std.Wrappers.Option<RAST._IExpr>.create_None()), RAST.Expr.create_StmtExpr(RAST.Expr.create_AssignVar(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("abc"), _1837_c), RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))))).Optimize();
+        RAST._IExpr _1843___v5;
+        _1843___v5 = (RAST.Expr.create_UnaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), _1837_c, DAST.Format.UnaryOpFormat.create_NoFormat())).Optimize();
+        RAST._IExpr _1844___v6;
+        _1844___v6 = (RAST.Expr.create_UnaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!"), _1837_c, DAST.Format.UnaryOpFormat.create_NoFormat())).Optimize();
+        RAST._IExpr _1845___v7;
+        _1845___v7 = (RAST.Expr.create_ConversionNum(RAST.Type.create_U8(), _1837_c)).Optimize();
+        RAST._IExpr _1846___v8;
+        _1846___v8 = (RAST.Expr.create_ConversionNum(RAST.Type.create_U8(), RAST.Expr.create_Call(_1837_c, Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements()))).Optimize();
+        RAST._IExpr _1847___v9;
+        _1847___v9 = (RAST.Expr.create_ConversionNum(RAST.Type.create_U8(), RAST.Expr.create_Call(RAST.Expr.create_MemberSelect(_1837_c, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("from")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements()))).Optimize();
+        RAST._IExpr _1848___v10;
+        _1848___v10 = (RAST.Expr.create_ConversionNum(RAST.Type.create_U8(), RAST.Expr.create_Call(RAST.Expr.create_MemberSelect(RAST.Expr.create_MemberSelect(_1837_c, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("DafnyInt")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("from")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements()))).Optimize();
+        RAST._IExpr _1849___v11;
+        _1849___v11 = (RAST.Expr.create_ConversionNum(RAST.Type.create_U8(), RAST.Expr.create_Call(RAST.Expr.create_MemberSelect(RAST.Expr.create_MemberSelect(RAST.Expr.create_MemberSelect(_1837_c, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("dafny_runtime")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("DafnyInt")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("from")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements()))).Optimize();
+        RAST._IExpr _1850___v12;
+        _1850___v12 = (RAST.Expr.create_ConversionNum(RAST.Type.create_U8(), RAST.Expr.create_Call(RAST.Expr.create_MemberSelect(RAST.Expr.create_MemberSelect(RAST.Expr.create_MemberSelect(RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("dafny_runtime")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("DafnyInt")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("from")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_1837_c)))).Optimize();
+        Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1851___v13;
+        _1851___v13 = (_1837_c).RightMostIdentifier();
+      }
+    }
+    public static void TestPrintingInfo()
+    {
+      RAST._IExpr _1852_x;
+      _1852_x = RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x"));
+      RAST._IExpr _1853_y;
+      _1853_y = RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("y"));
+      DAST.Format._IBinaryOpFormat _1854_bnf;
+      _1854_bnf = DAST.Format.BinaryOpFormat.create_NoFormat();
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(((RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x"))).printingInfo).is_UnknownPrecedence);
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((_1852_x).printingInfo, RAST.PrintingInfo.create_Precedence(BigInteger.One)));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_LiteralInt(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("3"))).printingInfo, RAST.PrintingInfo.create_Precedence(BigInteger.One)));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_LiteralString(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("abc"), true)).printingInfo, RAST.PrintingInfo.create_Precedence(BigInteger.One)));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_UnaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("?"), _1852_x, DAST.Format.UnaryOpFormat.create_NoFormat())).printingInfo, RAST.PrintingInfo.create_SuffixPrecedence(new BigInteger(5))));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_UnaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("-"), _1852_x, DAST.Format.UnaryOpFormat.create_NoFormat())).printingInfo, RAST.PrintingInfo.create_Precedence(new BigInteger(6))));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_UnaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("*"), _1852_x, DAST.Format.UnaryOpFormat.create_NoFormat())).printingInfo, RAST.PrintingInfo.create_Precedence(new BigInteger(6))));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_UnaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!"), _1852_x, DAST.Format.UnaryOpFormat.create_NoFormat())).printingInfo, RAST.PrintingInfo.create_Precedence(new BigInteger(6))));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_UnaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), _1852_x, DAST.Format.UnaryOpFormat.create_NoFormat())).printingInfo, RAST.PrintingInfo.create_Precedence(new BigInteger(6))));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_UnaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&mut"), _1852_x, DAST.Format.UnaryOpFormat.create_NoFormat())).printingInfo, RAST.PrintingInfo.create_Precedence(new BigInteger(6))));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_UnaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!!"), _1852_x, DAST.Format.UnaryOpFormat.create_NoFormat())).printingInfo, RAST.PrintingInfo.create_UnknownPrecedence()));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_Select(_1852_x, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("name"))).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(2), RAST.Associativity.create_LeftToRight())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_MemberSelect(_1852_x, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("name"))).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(2), RAST.Associativity.create_LeftToRight())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_Call(_1852_x, Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements())).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(2), RAST.Associativity.create_LeftToRight())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_TypeAscription(_1852_x, RAST.Type.create_I128())).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(10), RAST.Associativity.create_LeftToRight())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("*"), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(20), RAST.Associativity.create_LeftToRight())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/"), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(20), RAST.Associativity.create_LeftToRight())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("%"), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(20), RAST.Associativity.create_LeftToRight())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("+"), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(30), RAST.Associativity.create_LeftToRight())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("-"), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(30), RAST.Associativity.create_LeftToRight())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<<"), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(40), RAST.Associativity.create_LeftToRight())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">>"), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(40), RAST.Associativity.create_LeftToRight())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(50), RAST.Associativity.create_LeftToRight())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("^"), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(60), RAST.Associativity.create_LeftToRight())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("|"), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(70), RAST.Associativity.create_LeftToRight())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("=="), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(80), RAST.Associativity.create_RequiresParentheses())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!="), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(80), RAST.Associativity.create_RequiresParentheses())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(80), RAST.Associativity.create_RequiresParentheses())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">"), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(80), RAST.Associativity.create_RequiresParentheses())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<="), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(80), RAST.Associativity.create_RequiresParentheses())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">="), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(80), RAST.Associativity.create_RequiresParentheses())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&&"), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(90), RAST.Associativity.create_LeftToRight())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("||"), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(100), RAST.Associativity.create_LeftToRight())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".."), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RequiresParentheses())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("..="), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RequiresParentheses())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("="), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RightToLeft())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("+="), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RightToLeft())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("-="), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RightToLeft())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("*="), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RightToLeft())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/="), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RightToLeft())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("%="), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RightToLeft())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&="), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RightToLeft())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("|="), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RightToLeft())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("^="), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RightToLeft())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<<="), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RightToLeft())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">>="), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RightToLeft())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("?!?"), _1852_x, _1853_y, _1854_bnf)).printingInfo, RAST.PrintingInfo.create_PrecedenceAssociativity(BigInteger.Zero, RAST.Associativity.create_RequiresParentheses())));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(object.Equals((RAST.Expr.create_Break(Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None())).printingInfo, RAST.PrintingInfo.create_UnknownPrecedence()));
+    }
+    public static void TestExpr()
+    {
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.TestOptimizeToString();
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.TestPrintingInfo();
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.TestNoExtraSemicolonAfter();
+    }
+    public static void AssertCoverage(bool x)
+    {
+    }
+    public static void TestNoExtraSemicolonAfter()
+    {
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage((RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";"))).NoExtraSemicolonAfter());
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(!((RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("a"))).NoExtraSemicolonAfter()));
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage((RAST.Expr.create_Return(Std.Wrappers.Option<RAST._IExpr>.create_None())).NoExtraSemicolonAfter());
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage((RAST.Expr.create_Continue(Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None())).NoExtraSemicolonAfter());
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage((RAST.Expr.create_Break(Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None())).NoExtraSemicolonAfter());
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage((RAST.Expr.create_AssignVar(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x"), RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("y")))).NoExtraSemicolonAfter());
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage((RAST.Expr.create_DeclareVar(RAST.DeclareType.create_MUT(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x"), Std.Wrappers.Option<RAST._IType>.create_None(), Std.Wrappers.Option<RAST._IExpr>.create_None())).NoExtraSemicolonAfter());
+      DafnyToRustCompilerCoverage.RASTCoverage.__default.AssertCoverage(!((RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("x"))).NoExtraSemicolonAfter()));
+    }
+  }
+} // end of namespace DafnyToRustCompilerCoverage.RASTCoverage
\ No newline at end of file
diff --git a/Source/DafnyCore/AST/Expressions/Variables/IVariable.cs b/Source/DafnyCore/AST/Expressions/Variables/IVariable.cs
index 36f35a0ed1f..b262ff36001 100644
--- a/Source/DafnyCore/AST/Expressions/Variables/IVariable.cs
+++ b/Source/DafnyCore/AST/Expressions/Variables/IVariable.cs
@@ -24,6 +24,10 @@ string UniqueName {
   string SanitizedName {
     get;
   }
+  string SanitizedNameShadowable { // A name suitable for compilation, but without the unique identifier.
+                                   // Useful to generate readable identifiers in the generated source code.
+    get;
+  }
   string CompileName {
     get;
   }
diff --git a/Source/DafnyCore/AST/Expressions/Variables/IVariableContracts.cs b/Source/DafnyCore/AST/Expressions/Variables/IVariableContracts.cs
index 0fe8374904f..9ebe8a5af79 100644
--- a/Source/DafnyCore/AST/Expressions/Variables/IVariableContracts.cs
+++ b/Source/DafnyCore/AST/Expressions/Variables/IVariableContracts.cs
@@ -41,6 +41,13 @@ public string SanitizedName {
       throw new NotImplementedException();  // this getter implementation is here only so that the Ensures contract can be given here
     }
   }
+
+  public string SanitizedNameShadowable {
+    get {
+      Contract.Ensures(Contract.Result<string>() != null);
+      throw new NotImplementedException();  // this getter implementation is here only so that the Ensures contract can be given here
+    }
+  }
   public string CompileName {
     get {
       Contract.Ensures(Contract.Result<string>() != null);
diff --git a/Source/DafnyCore/AST/Expressions/Variables/NonglobalVariable.cs b/Source/DafnyCore/AST/Expressions/Variables/NonglobalVariable.cs
index f81d643d644..98c24af35d7 100644
--- a/Source/DafnyCore/AST/Expressions/Variables/NonglobalVariable.cs
+++ b/Source/DafnyCore/AST/Expressions/Variables/NonglobalVariable.cs
@@ -74,9 +74,14 @@ public static string SanitizeName(string nm) {
     }
   }
 
+  private string sanitizedNameShadowable;
+
+  public virtual string SanitizedNameShadowable =>
+    sanitizedNameShadowable ??= SanitizeName(Name);
+
   private string sanitizedName;
   public virtual string SanitizedName =>
-    sanitizedName ??= $"_{IVariable.CompileNameIdGenerator.FreshNumericId()}_{SanitizeName(Name)}";
+    sanitizedName ??= $"_{IVariable.CompileNameIdGenerator.FreshNumericId()}_{SanitizedNameShadowable}";
 
   protected string compileName;
   public virtual string CompileName =>
diff --git a/Source/DafnyCore/AST/Statements/Assignment/LocalVariable.cs b/Source/DafnyCore/AST/Statements/Assignment/LocalVariable.cs
index 3ae978865a6..880044f70ee 100644
--- a/Source/DafnyCore/AST/Statements/Assignment/LocalVariable.cs
+++ b/Source/DafnyCore/AST/Statements/Assignment/LocalVariable.cs
@@ -68,9 +68,15 @@ public string AssignUniqueName(FreshIdGenerator generator) {
     return uniqueName ??= generator.FreshId(Name + "#");
   }
 
+  private string sanitizedNameShadowable;
+
+  public string SanitizedNameShadowable =>
+    sanitizedNameShadowable ??= NonglobalVariable.SanitizeName(Name);
+
   private string sanitizedName;
+
   public string SanitizedName =>
-    sanitizedName ??= $"_{IVariable.CompileNameIdGenerator.FreshNumericId()}_{NonglobalVariable.SanitizeName(Name)}";
+    sanitizedName ??= $"_{IVariable.CompileNameIdGenerator.FreshNumericId()}_{SanitizedNameShadowable}";
 
   string compileName;
   public string CompileName =>
diff --git a/Source/DafnyCore/AST/TypeDeclarations/NewtypeDecl.cs b/Source/DafnyCore/AST/TypeDeclarations/NewtypeDecl.cs
index 8d9e9b7414a..efd594d52f4 100644
--- a/Source/DafnyCore/AST/TypeDeclarations/NewtypeDecl.cs
+++ b/Source/DafnyCore/AST/TypeDeclarations/NewtypeDecl.cs
@@ -174,7 +174,7 @@ public class NativeType {
   public readonly BigInteger LowerBound;
   public readonly BigInteger UpperBound;
   public readonly int Bitwidth;  // for unassigned types, this shows the number of bits in the type; else is 0
-  public enum Selection { Byte, SByte, UShort, Short, UInt, Int, Number, ULong, Long }
+  public enum Selection { Byte, SByte, UShort, Short, UInt, Int, Number, ULong, Long, UDoubleLong, DoubleLong }
   public readonly Selection Sel;
   public NativeType(string Name, BigInteger LowerBound, BigInteger UpperBound, int bitwidth, Selection sel) {
     Contract.Requires(Name != null);
diff --git a/Source/DafnyCore/Backends/CSharp/CsharpCodeGenerator.cs b/Source/DafnyCore/Backends/CSharp/CsharpCodeGenerator.cs
index 3b3b7d85dfc..e1f169c90f0 100644
--- a/Source/DafnyCore/Backends/CSharp/CsharpCodeGenerator.cs
+++ b/Source/DafnyCore/Backends/CSharp/CsharpCodeGenerator.cs
@@ -3422,15 +3422,16 @@ protected override ConcreteSyntaxTree EmitMapBuilder_Add(MapType mt, IToken tok,
       return termLeftWriter;
     }
 
-    protected override string GetCollectionBuilder_Build(CollectionType ct, IToken tok, string collName, ConcreteSyntaxTree wr) {
+    protected override void GetCollectionBuilder_Build(CollectionType ct, IToken tok, string collName,
+      ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmt) {
       if (ct is SetType) {
         var typeName = TypeName(ct.Arg, wr, tok);
-        return string.Format($"{DafnySetClass}<{typeName}>.FromCollection({collName})");
+        wr.Write(string.Format($"{DafnySetClass}<{typeName}>.FromCollection({collName})"));
       } else if (ct is MapType) {
         var mt = (MapType)ct;
         var domtypeName = TypeName(mt.Domain, wr, tok);
         var rantypeName = TypeName(mt.Range, wr, tok);
-        return $"{DafnyMapClass}<{domtypeName},{rantypeName}>.FromCollection({collName})";
+        wr.Write($"{DafnyMapClass}<{domtypeName},{rantypeName}>.FromCollection({collName})");
       } else {
         Contract.Assume(false);  // unexpected collection type
         throw new cce.UnreachableException();  // please compiler
diff --git a/Source/DafnyCore/Backends/Cplusplus/CppCodeGenerator.cs b/Source/DafnyCore/Backends/Cplusplus/CppCodeGenerator.cs
index 4daa13de548..ca0ecc56b6d 100644
--- a/Source/DafnyCore/Backends/Cplusplus/CppCodeGenerator.cs
+++ b/Source/DafnyCore/Backends/Cplusplus/CppCodeGenerator.cs
@@ -2455,9 +2455,10 @@ protected override ConcreteSyntaxTree EmitMapBuilder_Add(MapType mt, IToken tok,
       throw new UnsupportedFeatureException(tok, Feature.MapComprehensions);
     }
 
-    protected override string GetCollectionBuilder_Build(CollectionType ct, IToken tok, string collName, ConcreteSyntaxTree wr) {
+    protected override void GetCollectionBuilder_Build(CollectionType ct, IToken tok, string collName,
+      ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmt) {
       // collections are built in place
-      return collName;
+      wr.Write(collName);
     }
 
     protected override void EmitSingleValueGenerator(Expression e, bool inLetExprBody, string type,
diff --git a/Source/DafnyCore/Backends/Dafny/AST.dfy b/Source/DafnyCore/Backends/Dafny/AST.dfy
index 32721b9e081..7d508fa1060 100644
--- a/Source/DafnyCore/Backends/Dafny/AST.dfy
+++ b/Source/DafnyCore/Backends/Dafny/AST.dfy
@@ -1,3 +1,22 @@
+module {:extern "DAST.Format"} DAST.Format
+  /* Cues about how to format different AST elements if necessary,
+     e.g. to generate idiomatic code when needed. */
+{
+  // Dafny AST compilation tenets:
+  // - The Compiled Dafny AST should be minimal
+  // - The generated code should look idiomatic and close to the original Dafny file if possible
+  // Since the two might conflict, the second one is taken care of by adding formatting information
+
+  datatype UnaryOpFormat =
+    | NoFormat
+    | CombineFormat
+  datatype BinaryOpFormat =
+    | NoFormat
+    | ImpliesFormat
+    | EquivalenceFormat
+    | ReverseFormat
+}
+
 module {:extern "DAST"} DAST {
   import opened Std.Wrappers
 
@@ -19,13 +38,22 @@ module {:extern "DAST"} DAST {
     Set(element: Type) |
     Multiset(element: Type) |
     Map(key: Type, value: Type) |
+    SetBuilder(element: Type) |
+    MapBuilder(key: Type, value: Type) |
     Arrow(args: seq<Type>, result: Type) |
     Primitive(Primitive) | Passthrough(string) |
     TypeArg(Ident)
 
   datatype Primitive = Int | Real | String | Bool | Char
 
-  datatype ResolvedType = Datatype(path: seq<Ident>) | Trait(path: seq<Ident>) | Newtype(Type)
+  datatype NewtypeRange =
+    | U8 | I8 | U16 | I16 | U32 | I32 | U64 | I64 | U128 | I128 | BigInt
+    | NoRange
+
+  datatype ResolvedType =
+    | Datatype(path: seq<Ident>)
+    | Trait(path: seq<Ident>)
+    | Newtype(baseType: Type, range: NewtypeRange, erase: bool)
 
   datatype Ident = Ident(id: string)
 
@@ -37,7 +65,7 @@ module {:extern "DAST"} DAST {
 
   datatype DatatypeCtor = DatatypeCtor(name: string, args: seq<Formal>, hasAnyArgs: bool /* includes ghost */)
 
-  datatype Newtype = Newtype(name: string, typeParams: seq<Type>, base: Type, witnessStmts: seq<Statement>, witnessExpr: Option<Expression>)
+  datatype Newtype = Newtype(name: string, typeParams: seq<Type>, base: Type, range: NewtypeRange, witnessStmts: seq<Statement>, witnessExpr: Option<Expression>)
 
   datatype ClassItem = Method(Method)
 
@@ -47,6 +75,10 @@ module {:extern "DAST"} DAST {
 
   datatype Method = Method(isStatic: bool, hasBody: bool, overridingPath: Option<seq<Ident>>, name: string, typeParams: seq<Type>, params: seq<Formal>, body: seq<Statement>, outTypes: seq<Type>, outVars: Option<seq<Ident>>)
 
+  datatype CallName =
+    Name(name: string) |
+    MapBuilderAdd | MapBuilderBuild | SetBuilderAdd | SetBuilderBuild
+
   datatype Statement =
     DeclareVar(name: string, typ: Type, maybeValue: Option<Expression>) |
     Assign(lhs: AssignLhs, value: Expression) |
@@ -54,7 +86,7 @@ module {:extern "DAST"} DAST {
     Labeled(lbl: string, body: seq<Statement>) |
     While(cond: Expression, body: seq<Statement>) |
     Foreach(boundName: string, boundType: Type, over: Expression, body: seq<Statement>) |
-    Call(on: Expression, name: string, typeArgs: seq<Type>, args: seq<Expression>, outs: Option<seq<Ident>>) |
+    Call(on: Expression, callName: CallName, typeArgs: seq<Type>, args: seq<Expression>, outs: Option<seq<Ident>>) |
     Return(expr: Expression) |
     EarlyReturn() |
     Break(toLabel: Option<string>) |
@@ -72,13 +104,21 @@ module {:extern "DAST"} DAST {
 
   datatype BinOp =
     Eq(referential: bool, nullable: bool) |
-    Neq(referential: bool, nullable: bool) |
     Div() | EuclidianDiv() |
     Mod() | EuclidianMod() |
-    Implies() | // TODO: REplace by Not Or
+    Lt() | // a <= b is !(b < a)
+    LtChar() |
+    Plus() | Minus() | Times() |
+    BitwiseAnd() | BitwiseOr() | BitwiseXor() |
+    BitwiseShiftRight() | BitwiseShiftLeft() |
+    And() | Or() |
     In() |
-    NotIn() | // TODO: Replace by Not In
-    SetDifference() |
+    SeqProperPrefix() | SeqPrefix() |
+    SetMerge() | SetSubtraction() | SetIntersection() |
+    Subset() | ProperSubset() | SetDisjoint() |
+    MapMerge() | MapSubtraction() |
+    MultisetMerge() | MultisetSubtraction() | MultisetIntersection() |
+    Submultiset() | ProperSubmultiset() | MultisetDisjoint() |
     Concat() |
     Passthrough(string)
 
@@ -94,18 +134,26 @@ module {:extern "DAST"} DAST {
     SeqConstruct(length: Expression, elem: Expression) |
     SeqValue(elements: seq<Expression>, typ: Type) |
     SetValue(elements: seq<Expression>) |
+    MultisetValue(elements: seq<Expression>) |
     MapValue(mapElems: seq<(Expression, Expression)>) |
+    MapBuilder(keyType: Type, valueType: Type) |
+    SeqUpdate(expr: Expression, indexExpr: Expression, value: Expression) |
+    MapUpdate(expr: Expression, indexExpr: Expression, value: Expression) |
+    SetBuilder(elemType: Type) |
+    ToMultiset(Expression) |
     This() |
     Ite(cond: Expression, thn: Expression, els: Expression) |
-    UnOp(unOp: UnaryOp, expr: Expression) |
-    BinOp(op: BinOp, left: Expression, right: Expression) |
+    UnOp(unOp: UnaryOp, expr: Expression, format1: Format.UnaryOpFormat) |
+    BinOp(op: BinOp, left: Expression, right: Expression, format2: Format.BinaryOpFormat) |
     ArrayLen(expr: Expression, dim: nat) |
+    MapKeys(expr: Expression) |
+    MapValues(expr: Expression) |
     Select(expr: Expression, field: string, isConstant: bool, onDatatype: bool) |
     SelectFn(expr: Expression, field: string, onDatatype: bool, isStatic: bool, arity: nat) |
     Index(expr: Expression, collKind: CollKind, indices: seq<Expression>) |
     IndexRange(expr: Expression, isArray: bool, low: Option<Expression>, high: Option<Expression>) |
     TupleSelect(expr: Expression, index: nat) |
-    Call(on: Expression, name: Ident, typeArgs: seq<Type>, args: seq<Expression>) |
+    Call(on: Expression, callName: CallName, typeArgs: seq<Type>, args: seq<Expression>) |
     Lambda(params: seq<Formal>, retType: Type, body: seq<Statement>) |
     BetaRedex(values: seq<(Formal, Expression)>, retType: Type, expr: Expression) |
     IIFE(name: Ident, typ: Type, value: Expression, iifeBody: Expression) |
diff --git a/Source/DafnyCore/Backends/Dafny/ASTBuilder.cs b/Source/DafnyCore/Backends/Dafny/ASTBuilder.cs
index 6d8330abe7a..42f19c75760 100644
--- a/Source/DafnyCore/Backends/Dafny/ASTBuilder.cs
+++ b/Source/DafnyCore/Backends/Dafny/ASTBuilder.cs
@@ -2,12 +2,18 @@
 using System.Collections.Generic;
 using Dafny;
 using DAST;
+using DAST.Format;
+using JetBrains.Annotations;
 using Microsoft.CodeAnalysis;
 using Microsoft.Dafny.Compilers;
 using Std.Wrappers;
 
 namespace Microsoft.Dafny.Compilers {
 
+  interface Container {
+    public void AddUnsupported(string why);
+  }
+
   class ProgramBuilder : ModuleContainer {
     readonly List<Module> items = new();
 
@@ -18,14 +24,23 @@ public void AddModule(Module item) {
     public List<Module> Finish() {
       return items;
     }
+
+    public void AddUnsupported(string why) {
+      items.Add(ModuleContainer.UnsupportedToModule(why));
+    }
   }
 
-  interface ModuleContainer {
+  interface ModuleContainer : Container {
     void AddModule(Module item);
 
     public ModuleBuilder Module(string name, bool isExtern) {
       return new ModuleBuilder(this, name, isExtern);
     }
+
+    static public Module UnsupportedToModule(string why) {
+      return new Module(Sequence<Rune>.UnicodeFromString(why), true,
+        Sequence<ModuleItem>.FromArray(new ModuleItem[] { }));
+    }
   }
 
   class ModuleBuilder : ClassContainer, TraitContainer, NewtypeContainer, DatatypeContainer {
@@ -68,9 +83,13 @@ public object Finish() {
       ));
       return parent;
     }
+
+    public void AddUnsupported(string why) {
+      body.Add((ModuleItem)ModuleItem.create_Module(ModuleContainer.UnsupportedToModule(why)));
+    }
   }
 
-  interface ClassContainer {
+  interface ClassContainer : Container {
     void AddClass(Class item);
 
     public ClassBuilder Class(string name, string enclosingModule, List<DAST.Type> typeParams, List<DAST.Type> superClasses) {
@@ -116,7 +135,7 @@ public object Finish() {
     }
   }
 
-  interface TraitContainer {
+  interface TraitContainer : Container {
     void AddTrait(Trait item);
 
     public TraitBuilder Trait(string name, List<DAST.Type> typeParams) {
@@ -162,11 +181,12 @@ public object Finish() {
     }
   }
 
-  interface NewtypeContainer {
+  interface NewtypeContainer : Container {
     void AddNewtype(Newtype item);
 
-    public NewtypeBuilder Newtype(string name, List<DAST.Type> typeParams, DAST.Type baseType, List<DAST.Statement> witnessStmts, DAST.Expression witness) {
-      return new NewtypeBuilder(this, name, typeParams, baseType, witnessStmts, witness);
+    public NewtypeBuilder Newtype(string name, List<DAST.Type> typeParams,
+      DAST.Type baseType, DAST.NewtypeRange newtypeRange, List<DAST.Statement> witnessStmts, DAST.Expression witness) {
+      return new NewtypeBuilder(this, name, typeParams, newtypeRange, baseType, witnessStmts, witness);
     }
   }
 
@@ -175,13 +195,16 @@ class NewtypeBuilder : ClassLike {
     readonly string name;
     readonly List<DAST.Type> typeParams;
     readonly DAST.Type baseType;
+    private readonly DAST.NewtypeRange newtypeRange;
     readonly List<DAST.Statement> witnessStmts;
     readonly DAST.Expression witness;
 
-    public NewtypeBuilder(NewtypeContainer parent, string name, List<DAST.Type> typeParams, DAST.Type baseType, List<DAST.Statement> statements, DAST.Expression witness) {
+    public NewtypeBuilder(NewtypeContainer parent, string name, List<DAST.Type> typeParams,
+      DAST.NewtypeRange newtypeRange, DAST.Type baseType, List<DAST.Statement> statements, DAST.Expression witness) {
       this.parent = parent;
       this.name = name;
       this.typeParams = typeParams;
+      this.newtypeRange = newtypeRange;
       this.baseType = baseType;
       this.witnessStmts = statements;
       this.witness = witness;
@@ -200,6 +223,7 @@ public object Finish() {
         Sequence<Rune>.UnicodeFromString(this.name),
         Sequence<DAST.Type>.FromArray(this.typeParams.ToArray()),
         this.baseType,
+        newtypeRange,
         Sequence<DAST.Statement>.FromArray(this.witnessStmts.ToArray()),
         this.witness == null ? Option<DAST._IExpression>.create_None() : Option<DAST._IExpression>.create_Some(this.witness)
       ));
@@ -207,7 +231,7 @@ public object Finish() {
     }
   }
 
-  interface DatatypeContainer {
+  interface DatatypeContainer : Container {
     void AddDatatype(Datatype item);
 
     public DatatypeBuilder Datatype(string name, string enclosingModule, List<DAST.Type> typeParams, List<DAST.DatatypeCtor> ctors, bool isCo) {
@@ -335,13 +359,21 @@ public DAST.Method Build() {
         outVars != null ? Option<ISequence<ISequence<Rune>>>.create_Some(Sequence<ISequence<Rune>>.FromArray(outVars.ToArray())) : Option<ISequence<ISequence<Rune>>>.create_None()
       );
     }
+
+    public void AddUnsupported(string why) {
+      AddStatement(StatementContainer.UnsupportedToStatement(why));
+    }
   }
 
-  interface StatementContainer {
+  interface StatementContainer : Container {
     void AddStatement(DAST.Statement item);
 
     void AddBuildable(BuildableStatement item);
 
+    public static DAST.Statement UnsupportedToStatement(string why) {
+      return (DAST.Statement)DAST.Statement.create_Print(ExprContainer.UnsupportedToExpr(why));
+    }
+
     List<object> ForkList();
 
     public StatementContainer Fork() {
@@ -445,6 +477,10 @@ public List<object> ForkList() {
       list.Add(ret);
       return ret;
     }
+
+    public void AddUnsupported(string why) {
+      AddStatement(StatementContainer.UnsupportedToStatement(why));
+    }
   }
 
   class DeclareBuilder : ExprContainer, BuildableStatement {
@@ -482,6 +518,10 @@ public DAST.Statement Build() {
         return (DAST.Statement)DAST.Statement.create_DeclareVar(Sequence<Rune>.UnicodeFromString(name), type, Option<DAST._IExpression>.create_Some(builtValue[0]));
       }
     }
+
+    public void AddUnsupported(string why) {
+      AddExpr(Compilers.ExprContainer.UnsupportedToExpr(why));
+    }
   }
 
   class AssignBuilder : LhsContainer, ExprContainer, BuildableStatement {
@@ -519,18 +559,23 @@ public void AddBuildable(BuildableExpr value) {
         this.value = value;
       }
     }
+    public void AddUnsupported(string why) {
+      AddExpr(Compilers.ExprContainer.UnsupportedToExpr(why));
+    }
 
     public DAST.Statement Build() {
+
+      var builtLhs = LhsContainer.Build(lhs);
+      DAST.Expression rhs;
       if (this.value == null) {
-        throw new InvalidOperationException("Cannot assign null value to variable: " + lhs);
+        rhs = ExprContainer.UnsupportedToExpr("<i>Cannot assign null value to variable</i>: " + lhs);
       } else {
         var builtValue = new List<DAST.Expression>();
         ExprContainer.RecursivelyBuild(new List<object> { value }, builtValue);
-
-        var builtLhs = LhsContainer.Build(lhs);
-
-        return (DAST.Statement)DAST.Statement.create_Assign(builtLhs, builtValue[0]);
+        rhs = builtValue[0];
       }
+
+      return (DAST.Statement)DAST.Statement.create_Assign(builtLhs, rhs);
     }
   }
 
@@ -591,7 +636,9 @@ public ElseBuilder Else() {
 
     public DAST.Statement Build() {
       List<DAST.Expression> builtCondition = new();
-      ExprContainer.RecursivelyBuild(new List<object> { condition }, builtCondition);
+      ExprContainer.RecursivelyBuild(new List<object> {
+        condition ?? ExprContainer.UnsupportedToExpr("<i>condition to if expression</i>")
+      }, builtCondition);
 
       List<DAST.Statement> builtIfStatements = new();
       StatementContainer.RecursivelyBuild(ifBody, builtIfStatements);
@@ -605,6 +652,10 @@ public DAST.Statement Build() {
         Sequence<DAST.Statement>.FromArray(builtElseStatements.ToArray())
       );
     }
+
+    public void AddUnsupported(string why) {
+      condition = ExprContainer.UnsupportedToExpr(why);
+    }
   }
 
   class ElseBuilder : StatementContainer {
@@ -625,6 +676,10 @@ public void AddStatement(DAST.Statement item) {
     public void AddBuildable(BuildableStatement item) {
       parent.AddElseBuildable(item);
     }
+
+    public void AddUnsupported(string why) {
+      AddStatement(StatementContainer.UnsupportedToStatement(why));
+    }
   }
 
   class WhileBuilder : ExprContainer, StatementContainer, BuildableStatement {
@@ -673,6 +728,10 @@ public DAST.Statement Build() {
         Sequence<DAST.Statement>.FromArray(builtStatements.ToArray())
       );
     }
+
+    public void AddUnsupported(string why) {
+      AddStatement(StatementContainer.UnsupportedToStatement(why));
+    }
   }
 
   class ForeachBuilder : ExprContainer, StatementContainer, BuildableStatement {
@@ -718,7 +777,9 @@ public List<object> ForkList() {
 
     public DAST.Statement Build() {
       List<DAST.Expression> builtOver = new();
-      ExprContainer.RecursivelyBuild(new List<object> { over }, builtOver);
+      ExprContainer.RecursivelyBuild(new List<object> {
+        over ?? ExprContainer.UnsupportedToExpr("<i>Foreach over is null</i>")
+      }, builtOver);
 
       List<DAST.Statement> builtStatements = new();
       StatementContainer.RecursivelyBuild(body, builtStatements);
@@ -730,6 +791,10 @@ public DAST.Statement Build() {
         Sequence<DAST.Statement>.FromArray(builtStatements.ToArray())
       );
     }
+
+    public void AddUnsupported(string why) {
+      AddStatement(StatementContainer.UnsupportedToStatement(why));
+    }
   }
 
   class TailRecursiveBuilder : StatementContainer, BuildableStatement {
@@ -759,18 +824,22 @@ public DAST.Statement Build() {
         Sequence<DAST.Statement>.FromArray(builtStatements.ToArray())
       );
     }
+
+    public void AddUnsupported(string why) {
+      AddStatement(StatementContainer.UnsupportedToStatement(why));
+    }
   }
 
   class CallStmtBuilder : ExprContainer, BuildableStatement {
     object on = null;
-    string name = null;
+    DAST.CallName name = null;
     List<DAST.Type> typeArgs = null;
     readonly List<object> args = new();
     List<ISequence<Rune>> outs = null;
 
     public CallStmtBuilder() { }
 
-    public void SetName(string name) {
+    public void SetName(CallName name) {
       if (this.name != null) {
         throw new InvalidOperationException();
       } else {
@@ -819,12 +888,16 @@ public DAST.Statement Build() {
 
       return (DAST.Statement)DAST.Statement.create_Call(
         builtOn[0],
-        Sequence<Rune>.UnicodeFromString(name),
+        name,
         Sequence<DAST.Type>.FromArray(typeArgs.ToArray()),
         Sequence<DAST.Expression>.FromArray(builtArgs.ToArray()),
         outs == null ? Option<ISequence<ISequence<Rune>>>.create_None() : Option<ISequence<ISequence<Rune>>>.create_Some(Sequence<ISequence<Rune>>.FromArray(outs.ToArray()))
       );
     }
+
+    public void AddUnsupported(string why) {
+      AddExpr(ExprContainer.UnsupportedToExpr(why));
+    }
   }
 
   class ReturnBuilder : ExprContainer, BuildableStatement {
@@ -850,10 +923,17 @@ public void AddBuildable(BuildableExpr value) {
 
     public DAST.Statement Build() {
       var builtValue = new List<DAST.Expression>();
+      if (value == null) {
+        return (DAST.Statement)DAST.Statement.create_EarlyReturn();
+      }
       ExprContainer.RecursivelyBuild(new List<object> { value }, builtValue);
 
       return (DAST.Statement)DAST.Statement.create_Return(builtValue[0]);
     }
+
+    public void AddUnsupported(string why) {
+      value = ExprContainer.UnsupportedToExpr(why);
+    }
   }
 
   class LabeledBuilder : BuildableStatement, StatementContainer {
@@ -891,6 +971,10 @@ public DAST.Statement Build() {
         Sequence<DAST.Statement>.FromArray(builtStatements.ToArray())
       );
     }
+
+    public void AddUnsupported(string why) {
+      AddStatement(StatementContainer.UnsupportedToStatement(why));
+    }
   }
 
   class StatementBuffer : StatementContainer {
@@ -916,9 +1000,13 @@ public List<object> ForkList() {
 
       return builtResult;
     }
+
+    public void AddUnsupported(string why) {
+      AddStatement(StatementContainer.UnsupportedToStatement(why));
+    }
   }
 
-  class ExprBuffer : ExprContainer {
+  class ExprBuffer : ExprContainer, BuildableExpr {
     Stack<object> exprs = new();
     public readonly object parent;
 
@@ -956,15 +1044,25 @@ public void AddBuildable(BuildableExpr item) {
 
     public DAST.Expression Finish() {
       if (exprs.Count != 1) {
+        return ExprContainer.UnsupportedToExpr("Expected exactly one expression in buffer, got " +
+                                               exprs.Comma(e => e.ToString()));
         throw new UnsupportedFeatureException(Token.NoToken, Feature.RunAllTests); // Warning: this is an invalid operation
         //throw new InvalidOperationException("Expected exactly one expression in buffer, got " + exprs.Comma(e => e.ToString()));
       } else {
         return PopN(1)[0];
       }
     }
+
+    public void AddUnsupported(string why) {
+      AddExpr(ExprContainer.UnsupportedToExpr(why));
+    }
+
+    public DAST.Expression Build() {
+      return Finish();
+    }
   }
 
-  interface ExprContainer {
+  interface ExprContainer : Container {
     void AddExpr(DAST.Expression item);
 
     void AddBuildable(BuildableExpr item);
@@ -975,6 +1073,12 @@ BinOpBuilder BinOp(DAST.BinOp op) {
       return ret;
     }
 
+    BinOpBuilder BinOp(string op, Func<DAST.Expression, DAST.Expression, DAST.Expression> callback) {
+      var ret = new BinOpBuilder(op, callback);
+      AddBuildable(ret);
+      return ret;
+    }
+
     CallExprBuilder Call() {
       var ret = new CallExprBuilder();
       AddBuildable(ret);
@@ -1024,13 +1128,23 @@ protected static void RecursivelyBuild(List<object> body, List<DAST.Expression>
         } else if (maybeBuilt is BuildableExpr buildable) {
           builtExprs.Add(buildable.Build());
         } else {
-          throw new InvalidOperationException("Unknown buildable type: " + maybeBuilt.GetType());
+          throw new InvalidOperationException(
+            "Unknown buildable type: " +
+            (maybeBuilt == null ? "NULL" :
+             maybeBuilt.GetType())
+            );
         }
       }
     }
+
+    static DAST.Expression UnsupportedToExpr(string why) {
+      return (DAST.Expression)DAST.Expression.create_Ident(
+        Sequence<ISequence<Rune>>.UnicodeFromString($"<b>Unsupported: {why}</b>")
+      );
+    }
   }
 
-  interface LhsContainer {
+  interface LhsContainer : Container {
     void AddLhs(DAST.AssignLhs lhs);
 
     void AddBuildable(BuildableLhs lhs);
@@ -1090,6 +1204,10 @@ public DAST.AssignLhs Build() {
 
       return (DAST.AssignLhs)DAST.AssignLhs.create_Index(builtArrayExpr[0], Sequence<DAST.Expression>.FromArray(indices.ToArray()));
     }
+
+    public void AddUnsupported(string why) {
+      arrayExpr = ExprContainer.UnsupportedToExpr(why);
+    }
   }
 
   interface BuildableExpr {
@@ -1097,11 +1215,19 @@ interface BuildableExpr {
   }
 
   class BinOpBuilder : ExprContainer, BuildableExpr {
-    readonly DAST.BinOp op;
+    private readonly Func<DAST.Expression, DAST.Expression, DAST.Expression> internalBuilder;
     readonly List<object> operands = new();
+    private readonly string op;
 
     public BinOpBuilder(DAST.BinOp op) {
+      this.internalBuilder = (DAST.Expression left, DAST.Expression right) =>
+        (DAST.Expression)DAST.Expression.create_BinOp(op, left, right, new BinaryOpFormat_NoFormat());
+      this.op = op.ToString();
+    }
+
+    public BinOpBuilder(string op, Func<DAST.Expression, DAST.Expression, DAST.Expression> callback) {
       this.op = op;
+      internalBuilder = callback;
     }
 
     public void AddExpr(DAST.Expression item) {
@@ -1113,26 +1239,33 @@ public void AddBuildable(BuildableExpr item) {
     }
 
     public DAST.Expression Build() {
+      var builtOperands = new List<DAST.Expression>();
+      ExprContainer.RecursivelyBuild(operands, builtOperands);
+
       if (operands.Count != 2) {
-        throw new InvalidOperationException("Expected exactly two operands, got " + operands.Comma(o => o.ToString()));
+        builtOperands.Insert(0, ExprContainer.UnsupportedToExpr(op + " with not 2 elements"));
+        return (DAST.Expression)DAST.Expression.create_SetValue(
+          Sequence<DAST.Expression>.FromElements(builtOperands.ToArray()));
       }
 
-      var builtOperands = new List<DAST.Expression>();
-      ExprContainer.RecursivelyBuild(operands, builtOperands);
-      return (DAST.Expression)DAST.Expression.create_BinOp(op, builtOperands[0], builtOperands[1]);
+      return internalBuilder(builtOperands[0], builtOperands[1]);
+    }
+
+    public void AddUnsupported(string why) {
+      AddExpr(ExprContainer.UnsupportedToExpr(why));
     }
   }
 
   class CallExprBuilder : ExprContainer, BuildableExpr {
     object on = null;
-    string name = null;
+    DAST.CallName name = null;
     List<DAST.Type> typeArgs = null;
     readonly List<object> args = new();
     List<ISequence<Rune>> outs = null;
 
     public CallExprBuilder() { }
 
-    public void SetName(string name) {
+    public void SetName(DAST.CallName name) {
       if (this.name != null) {
         throw new InvalidOperationException();
       } else {
@@ -1181,11 +1314,15 @@ public DAST.Expression Build() {
 
       return (DAST.Expression)DAST.Expression.create_Call(
         builtOn[0],
-        Sequence<Rune>.UnicodeFromString(name),
+        name,
         Sequence<DAST.Type>.FromArray((typeArgs ?? new()).ToArray()),
         Sequence<DAST.Expression>.FromArray(builtArgs.ToArray())
       );
     }
+
+    public void AddUnsupported(string why) {
+      AddExpr(ExprContainer.UnsupportedToExpr(why));
+    }
   }
 
   class ApplyExprBuilder : ExprContainer, BuildableExpr {
@@ -1222,6 +1359,10 @@ public DAST.Expression Build() {
         Sequence<DAST.Expression>.FromArray(builtArgs.ToArray())
       );
     }
+
+    public void AddUnsupported(string why) {
+      AddExpr(ExprContainer.UnsupportedToExpr(why));
+    }
   }
 
   class LambdaExprBuilder : StatementContainer, BuildableExpr {
@@ -1258,6 +1399,10 @@ public DAST.Expression Build() {
         Sequence<DAST.Statement>.FromArray(builtBody.ToArray())
       );
     }
+
+    public void AddUnsupported(string why) {
+      AddStatement(StatementContainer.UnsupportedToStatement(why));
+    }
   }
 
   class IIFEExprBuilder : ExprContainer, BuildableExpr {
@@ -1297,7 +1442,9 @@ public DAST.Expression Build() {
       ExprContainer.RecursivelyBuild(new List<object> { body }, builtBody);
 
       var builtValue = new List<DAST.Expression>();
-      ExprContainer.RecursivelyBuild(new List<object> { value }, builtValue);
+      ExprContainer.RecursivelyBuild(new List<object> { value
+       ?? ExprContainer.UnsupportedToExpr("IIFEExprBuilder with empty value")
+       }, builtValue);
 
       return (DAST.Expression)DAST.Expression.create_IIFE(
         Sequence<Rune>.UnicodeFromString(name),
@@ -1306,6 +1453,10 @@ public DAST.Expression Build() {
         builtBody[0]
       );
     }
+
+    public void AddUnsupported(string why) {
+      AddExpr(ExprContainer.UnsupportedToExpr(why));
+    }
   }
 
   class IIFEExprRhs : ExprContainer {
@@ -1330,6 +1481,10 @@ public void AddBuildable(BuildableExpr item) {
         parent.value = item;
       }
     }
+
+    public void AddUnsupported(string why) {
+      AddExpr(ExprContainer.UnsupportedToExpr(why));
+    }
   }
 
   class BetaRedexBuilder : ExprContainer, BuildableExpr {
@@ -1360,6 +1515,10 @@ public DAST.Expression Build() {
         builtBody[0]
       );
     }
+
+    public void AddUnsupported(string why) {
+      AddExpr(ExprContainer.UnsupportedToExpr(why));
+    }
   }
 
   class ConvertBuilder : ExprContainer, BuildableExpr {
@@ -1390,14 +1549,24 @@ public void AddBuildable(BuildableExpr item) {
 
     public DAST.Expression Build() {
       var builtValue = new List<DAST.Expression>();
-      ExprContainer.RecursivelyBuild(new List<object> { value }, builtValue);
+      DAST.Expression v;
+      if (value == null) {
+        v = ExprContainer.UnsupportedToExpr($"Conversion from {fromType} to {toType} of something missing");
+      } else {
+        ExprContainer.RecursivelyBuild(new List<object> { value }, builtValue);
+        v = builtValue[0];
+      }
 
       return (DAST.Expression)DAST.Expression.create_Convert(
-        builtValue[0],
+        v,
         fromType,
         toType
       );
     }
+
+    public void AddUnsupported(string why) {
+      AddExpr(ExprContainer.UnsupportedToExpr(why));
+    }
   }
 
   class IndexBuilder : ExprContainer, BuildableExpr {
@@ -1436,6 +1605,10 @@ public DAST.Expression Build() {
         Sequence<DAST.Expression>.FromArray(indices.ToArray())
       );
     }
+
+    public void AddUnsupported(string why) {
+      AddExpr(ExprContainer.UnsupportedToExpr(why));
+    }
   }
 
 }
diff --git a/Source/DafnyCore/Backends/Dafny/BuilderSyntaxTree.cs b/Source/DafnyCore/Backends/Dafny/BuilderSyntaxTree.cs
index 8cb941f8752..c1a14b17ce1 100644
--- a/Source/DafnyCore/Backends/Dafny/BuilderSyntaxTree.cs
+++ b/Source/DafnyCore/Backends/Dafny/BuilderSyntaxTree.cs
@@ -4,27 +4,29 @@ namespace Microsoft.Dafny.Compilers {
 
   class BuilderSyntaxTree<T> : ConcreteSyntaxTree {
     public readonly T Builder;
+    public readonly DafnyCodeGenerator Compiler;
 
-    public BuilderSyntaxTree(T builder) {
+    public BuilderSyntaxTree(T builder, DafnyCodeGenerator compiler) {
       if (builder == null) {
         throw new ArgumentNullException(nameof(builder));
       }
 
       Builder = builder;
+      Compiler = compiler;
     }
 
     public override ConcreteSyntaxTree Fork(int relativeIndent = 0) {
       if (Builder is StatementContainer statementContainer) {
-        return new BuilderSyntaxTree<StatementContainer>(statementContainer.Fork());
+        return new BuilderSyntaxTree<StatementContainer>(statementContainer.Fork(), Compiler);
       } else {
-        DafnyCodeGenerator.ThrowGeneralUnsupported(); // Warning: this is an invalid operation: cannot fork builder of type Builder.GetType()
-        throw new InvalidOperationException();
+        // Warning: this is an invalid operation: cannot fork builder of type Builder.GetType()
+        throw new InvalidOperationException("<i>Builder not StatementContainer</i> but " + Builder.GetType().ToString());
       }
     }
 
     public override ConcreteSyntaxTree ForkInParens() {
       // TODO(shadaj): perhaps should check if we are an expr container
-      return new BuilderSyntaxTree<T>(Builder);
+      return new BuilderSyntaxTree<T>(Builder, Compiler);
     }
   }
 }
diff --git a/Source/DafnyCore/Backends/Dafny/DafnyCodeGenerator.cs b/Source/DafnyCore/Backends/Dafny/DafnyCodeGenerator.cs
index c205bd9eb76..6ee17e90993 100644
--- a/Source/DafnyCore/Backends/Dafny/DafnyCodeGenerator.cs
+++ b/Source/DafnyCore/Backends/Dafny/DafnyCodeGenerator.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using Dafny;
 using JetBrains.Annotations;
 using DAST;
@@ -7,6 +8,8 @@
 using Microsoft.BaseTypes;
 using System.Linq;
 using System.Diagnostics.Contracts;
+using System.IO;
+using DAST.Format;
 using Std.Wrappers;
 
 namespace Microsoft.Dafny.Compilers {
@@ -14,6 +17,8 @@ namespace Microsoft.Dafny.Compilers {
   class DafnyCodeGenerator : SinglePassCodeGenerator {
     ProgramBuilder items;
     public object currentBuilder;
+    public bool emitUncompilableCode;
+    public bool preventShadowing;
 
     public void Start() {
       if (items != null) {
@@ -31,16 +36,34 @@ public List<Module> Build() {
       return res;
     }
 
-    public DafnyCodeGenerator(DafnyOptions options, ErrorReporter reporter) : base(options, reporter) {
+    public DafnyCodeGenerator(DafnyOptions options, ErrorReporter reporter, bool preventShadowing, bool canEmitUncompilableCode) : base(options, reporter) {
       options.SystemModuleTranslationMode = CommonOptionBag.SystemModuleMode.Include;
       if (Options?.CoverageLegendFile != null) {
         Imports.Add("DafnyProfiling");
       }
+
+      emitUncompilableCode = options.Get(CommonOptionBag.EmitUncompilableCode) && canEmitUncompilableCode;
+      this.preventShadowing = preventShadowing;
+    }
+
+    protected override string GetCompileNameNotProtected(IVariable v) {
+      return preventShadowing ? v.CompileName : v.SanitizedNameShadowable;
+    }
+
+    public void AddUnsupported(string why) {
+      if (emitUncompilableCode && currentBuilder is Container container) {
+        container.AddUnsupported(why);
+      } else {
+        throw new UnsupportedInvalidOperationException(why);
+      }
     }
 
-    public static void ThrowGeneralUnsupported() {
-      // throw new InvalidOperationException(); // (useful for debugging)
-      throw new UnsupportedFeatureException(Token.NoToken, Feature.RunAllTests);
+    public void AddUnsupportedFeature(IToken token, Feature feature) {
+      if (emitUncompilableCode && currentBuilder is Container container) {
+        container.AddUnsupported("<i>" + feature.ToString() + "</i>");
+      } else {
+        throw new RecoverableUnsupportedFeatureException(token, feature);
+      }
     }
 
     public override IReadOnlySet<Feature> UnsupportedFeatures => new HashSet<Feature> {
@@ -67,7 +90,9 @@ public static void ThrowGeneralUnsupported() {
       Feature.TuplesWiderThan20,
       Feature.ForLoops,
       Feature.Traits,
-      Feature.RuntimeCoverageReport
+      Feature.RuntimeCoverageReport,
+      Feature.MultiDimensionalArrays,
+      Feature.NonNativeNewtypes
     };
 
     private readonly List<string> Imports = new() { DafnyDefaultModule };
@@ -81,13 +106,13 @@ protected override void EmitHeader(Program program, ConcreteSyntaxTree wr) {
     }
 
     public override void EmitCallToMain(Method mainMethod, string baseName, ConcreteSyntaxTree wr) {
-      ThrowGeneralUnsupported();
-      throw new InvalidOperationException();
+      AddUnsupported("<i>Call to main</i>");
     }
 
     protected override ConcreteSyntaxTree CreateStaticMain(IClassWriter cw, string argsParameterName) {
-      ThrowGeneralUnsupported();
-      throw new InvalidOperationException();
+      AddUnsupported("<i>create static main</i>");
+      return new BuilderSyntaxTree<ExprContainer>(
+        new ExprBuffer(this), this);
     }
 
     protected override ConcreteSyntaxTree CreateModule(string moduleName, bool isDefault, ModuleDefinition externModule,
@@ -118,7 +143,7 @@ private static string MangleName(string name) {
     protected override ConcreteSyntaxTree EmitCoercionIfNecessary(Type from, Type to, IToken tok, ConcreteSyntaxTree wr, Type toOrig = null) {
       if (currentBuilder is ExprBuffer buf && wr is not BuilderSyntaxTree<ExprContainer>) {
         // the writers are not currently wired properly for DatatypeValue
-        wr = new BuilderSyntaxTree<ExprContainer>(buf);
+        wr = new BuilderSyntaxTree<ExprContainer>(buf, this);
       }
 
       if (from == to) {
@@ -137,13 +162,13 @@ protected override ConcreteSyntaxTree EmitCoercionIfNecessary(Type from, Type to
             to = toNonNull.RhsWithArgument(toUdt.TypeArgs);
           }
 
-          return EmitCoercionIfNecessary(from, to, tok, new BuilderSyntaxTree<ExprContainer>(nullConvert));
+          return EmitCoercionIfNecessary(from, to, tok, new BuilderSyntaxTree<ExprContainer>(nullConvert, this));
         } else {
           return base.EmitCoercionIfNecessary(from, to, tok, wr);
         }
       } else if (from != null && to != null && (from.AsSubsetType != null || to.AsSubsetType != null)) {
         if (wr is BuilderSyntaxTree<ExprContainer> stmt) {
-          return new BuilderSyntaxTree<ExprContainer>(stmt.Builder.Convert(GenType(from), GenType(to)));
+          return new BuilderSyntaxTree<ExprContainer>(stmt.Builder.Convert(GenType(from), GenType(to)), this);
         } else {
           return base.EmitCoercionIfNecessary(from, to, tok, wr);
         }
@@ -151,8 +176,9 @@ protected override ConcreteSyntaxTree EmitCoercionIfNecessary(Type from, Type to
         if (from == null || to == null || from.Equals(to, true)) {
           return wr;
         } else {
-          ThrowGeneralUnsupported();
-          throw new InvalidOperationException();
+          AddUnsupported($"<i>Coercion</i> from {from} to {to}");
+          return new BuilderSyntaxTree<ExprContainer>(
+            new ExprBuffer(this), this);
         }
       }
     }
@@ -162,11 +188,12 @@ protected override IClassWriter CreateClass(string moduleName, string name, bool
       if (currentBuilder is ClassContainer builder) {
         List<DAST.Type> typeParams = new();
         foreach (var tp in typeParameters) {
-          if (!isTpSupported(tp)) {
-            ThrowGeneralUnsupported(); //("Contravariance in type parameters");
+          var compileName = IdProtect(tp.GetCompileName(Options));
+          if (!isTpSupported(tp, out var why)) {
+            AddUnsupported(why);
           }
 
-          typeParams.Add((DAST.Type)DAST.Type.create_TypeArg(Sequence<Rune>.UnicodeFromString(IdProtect(tp.GetCompileName(Options)))));
+          typeParams.Add((DAST.Type)DAST.Type.create_TypeArg(Sequence<Rune>.UnicodeFromString(compileName)));
         }
 
         return new ClassWriter(this, typeParams.Count > 0, builder.Class(name, moduleName, typeParams, superClasses.Select(t => GenType(t)).ToList()));
@@ -177,39 +204,49 @@ protected override IClassWriter CreateClass(string moduleName, string name, bool
 
     protected override IClassWriter CreateTrait(string name, bool isExtern, List<TypeParameter> typeParameters,
       TraitDecl trait, List<Type> superClasses, IToken tok, ConcreteSyntaxTree wr) {
-      throw new UnsupportedFeatureException(Token.NoToken, Feature.Traits);
-      // traits need a bit more work
 
-      // if (currentBuilder is TraitContainer builder) {
-      //   List<DAST.Type> typeParams = new();
-      //   foreach (var tp in trait.TypeArgs) {
-      //     typeParams.Add((DAST.Type)DAST.Type.create_TypeArg(Sequence<Rune>.UnicodeFromString(IdProtect(tp.GetCompileName(Options)))));
-      //   }
+      if (currentBuilder is TraitContainer builder) {
+        List<DAST.Type> typeParams = new();
+        foreach (var tp in trait.TypeArgs) {
+          typeParams.Add((DAST.Type)DAST.Type.create_TypeArg(Sequence<Rune>.UnicodeFromString(IdProtect(tp.GetCompileName(Options)))));
+        }
 
-      //   return new ClassWriter(this, builder.Trait(name, typeParams));
-      // } else {
-      //   throw new InvalidOperationException();
-      // }
+        return new ClassWriter(this, typeParameters.Any(), builder.Trait(name, typeParams));
+      } else {
+        throw new InvalidOperationException();
+      }
     }
 
     protected override ConcreteSyntaxTree CreateIterator(IteratorDecl iter, ConcreteSyntaxTree wr) {
-      throw new UnsupportedFeatureException(Token.NoToken, Feature.Iterators);
+      AddUnsupportedFeature(iter.tok, Feature.Iterators);
+      return wr;
     }
 
-    private static bool isTpSupported(TypeParameter tp) {
-      return tp.Variance == TypeParameter.TPVariance.Non &&
-        tp.Characteristics.EqualitySupport == TypeParameter.EqualitySupportValue.Unspecified;
+    private static bool isTpSupported(TypeParameter tp, [CanBeNull] out string why) {
+      if (tp.Variance != TypeParameter.TPVariance.Non) {
+        why = $"<b>Unsupported: <i>Type variance {tp.Variance} not supported</i></b>";
+        return false;
+      }
+
+      if (tp.Characteristics.EqualitySupport != TypeParameter.EqualitySupportValue.Unspecified) {
+        why = $"<b>Unsupported: <i>Type parameter Equality support {tp.Characteristics.EqualitySupport} not supported for type parameters</i></b>";
+        return false;
+      }
+
+      why = null;
+      return true;
     }
 
     protected override IClassWriter DeclareDatatype(DatatypeDecl dt, ConcreteSyntaxTree wr) {
       if (currentBuilder is DatatypeContainer builder) {
         List<DAST.Type> typeParams = new();
         foreach (var tp in dt.TypeArgs) {
-          if (!isTpSupported(tp) && !(dt is TupleTypeDecl)) {
-            ThrowGeneralUnsupported(); //("Contravariance in type parameters");
+          var compileName = IdProtect(tp.GetCompileName(Options));
+          if (!isTpSupported(tp, out var why) && !(dt is TupleTypeDecl)) {
+            AddUnsupported(why);
           }
 
-          typeParams.Add((DAST.Type)DAST.Type.create_TypeArg(Sequence<Rune>.UnicodeFromString(IdProtect(tp.GetCompileName(Options)))));
+          typeParams.Add((DAST.Type)DAST.Type.create_TypeArg(Sequence<Rune>.UnicodeFromString(compileName)));
         }
 
         List<DAST.DatatypeCtor> ctors = new();
@@ -241,19 +278,22 @@ protected override IClassWriter DeclareNewtype(NewtypeDecl nt, ConcreteSyntaxTre
 
         List<DAST.Statement> witnessStmts = new();
         DAST.Expression witness = null;
+        var buf = new ExprBuffer(null);
+        var statementBuf = new StatementBuffer();
         if (nt.WitnessKind == SubsetTypeDecl.WKind.Compiled) {
-          var buf = new ExprBuffer(null);
-          var statementBuf = new StatementBuffer();
           EmitExpr(
             nt.Witness, false,
-            EmitCoercionIfNecessary(nt.Witness.Type, erasedType, null, new BuilderSyntaxTree<ExprContainer>(buf)),
-            new BuilderSyntaxTree<StatementContainer>(statementBuf)
+            EmitCoercionIfNecessary(nt.Witness.Type, erasedType, null,
+              new BuilderSyntaxTree<ExprContainer>(buf, this)),
+            new BuilderSyntaxTree<StatementContainer>(statementBuf, this)
           );
           witness = buf.Finish();
           witnessStmts = statementBuf.PopAll();
         }
 
-        return new ClassWriter(this, false, builder.Newtype(nt.GetCompileName(Options), new(), GenType(erasedType), witnessStmts, witness));
+        return new ClassWriter(this, false, builder.Newtype(
+          nt.GetCompileName(Options), new(),
+          GenType(erasedType), NativeTypeToNewtypeRange(nt.NativeType), witnessStmts, witness));
       } else {
         throw new InvalidOperationException();
       }
@@ -291,6 +331,8 @@ private DAST.Type GenType(Type typ) {
           NativeType.Selection.UInt => DAST.Type.create_Passthrough(Sequence<Rune>.UnicodeFromString("u32")),
           NativeType.Selection.Long => DAST.Type.create_Passthrough(Sequence<Rune>.UnicodeFromString("i64")),
           NativeType.Selection.ULong => DAST.Type.create_Passthrough(Sequence<Rune>.UnicodeFromString("u64")),
+          NativeType.Selection.DoubleLong => DAST.Type.create_Passthrough(Sequence<Rune>.UnicodeFromString("i128")),
+          NativeType.Selection.UDoubleLong => DAST.Type.create_Passthrough(Sequence<Rune>.UnicodeFromString("u128")),
           _ => throw new InvalidOperationException(),
         });
       } else if (xType is SeqType seq) {
@@ -307,11 +349,12 @@ private DAST.Type GenType(Type typ) {
         var valueType = map.Range;
         return (DAST.Type)DAST.Type.create_Map(GenType(keyType), GenType(valueType));
       } else if (xType is BitvectorType) {
-        ThrowGeneralUnsupported(); //("Bitvector types");
-        throw new InvalidOperationException();
+        AddUnsupported("<i>Bitvector types</i>");
+        return (DAST.Type)DAST.Type.create_Passthrough(Sequence<Rune>.UnicodeFromString("Missing feature: Bitvector types"));
       } else {
-        ThrowGeneralUnsupported(); //("Type name for " + xType + " (" + typ.GetType() + ")");
-        throw new InvalidOperationException();
+        var why = "<i>Type name for " + xType + " (" + typ.GetType() + ")</i>";
+        AddUnsupported(why);
+        return (DAST.Type)DAST.Type.create_Passthrough(Sequence<Rune>.UnicodeFromString($"<b>Unsupported: {why}</b>"));
       }
     }
 
@@ -321,28 +364,33 @@ protected override void DeclareSubsetType(SubsetTypeDecl sst, ConcreteSyntaxTree
 
         List<DAST.Statement> witnessStmts = new();
         DAST.Expression witness = null;
+        var statementBuf = new StatementBuffer();
+        var buf = new ExprBuffer(null);
         if (sst.WitnessKind == SubsetTypeDecl.WKind.Compiled) {
-          var statementBuf = new StatementBuffer();
-          var buf = new ExprBuffer(null);
           EmitExpr(
             sst.Witness, false,
-            EmitCoercionIfNecessary(sst.Witness.Type, erasedType, null, new BuilderSyntaxTree<ExprContainer>(buf)),
-            new BuilderSyntaxTree<StatementContainer>(statementBuf)
+            EmitCoercionIfNecessary(sst.Witness.Type, erasedType, null, new BuilderSyntaxTree<ExprContainer>(buf, this)),
+            new BuilderSyntaxTree<StatementContainer>(statementBuf, this)
           );
           witness = buf.Finish();
           witnessStmts = statementBuf.PopAll();
         }
+        string baseName = sst.Var.CompileName;
+        DAST.Expression baseConstraint = buf.Finish();
+        var baseConstraintStmts = statementBuf.PopAll(); // TODO: Integrate in AST.
 
         List<DAST.Type> typeParams = new();
         foreach (var tp in sst.TypeArgs) {
-          if (!isTpSupported(tp)) {
-            ThrowGeneralUnsupported(); //("Contravariance in type parameters");
+          var compileName = tp.Name;
+          if (!isTpSupported(tp, out var why)) {
+            AddUnsupported(why);
           }
 
-          typeParams.Add((DAST.Type)DAST.Type.create_TypeArg(Sequence<Rune>.UnicodeFromString(tp.Name)));
+          typeParams.Add((DAST.Type)DAST.Type.create_TypeArg(Sequence<Rune>.UnicodeFromString(compileName)));
         }
 
-        builder.Newtype(sst.GetCompileName(Options), typeParams, GenType(erasedType), witnessStmts, witness).Finish();
+        builder.Newtype(sst.GetCompileName(Options), typeParams,
+          GenType(erasedType), (NewtypeRange)NewtypeRange.create_NoRange(), witnessStmts, witness).Finish();
       } else {
         throw new InvalidOperationException();
       }
@@ -369,16 +417,18 @@ public ClassWriter(DafnyCodeGenerator compiler, bool hasTypeArgs, ClassLike buil
       public ConcreteSyntaxTree CreateMethod(Method m, List<TypeArgumentInstantiation> typeArgs, bool createBody,
         bool forBodyInheritance, bool lookasideBody) {
         if (m.IsStatic && this.hasTypeArgs) {
-          ThrowGeneralUnsupported(); //("Static methods with type arguments");
+          compiler.AddUnsupported("<i>Static methods with type arguments</i>");
+          return new ConcreteSyntaxTree();
         }
 
         List<DAST.Type> astTypeArgs = new();
         foreach (var typeArg in typeArgs) {
-          if (!isTpSupported(typeArg.Formal)) {
-            ThrowGeneralUnsupported(); //("Contravariance in type parameters")
+          var compileName = compiler.IdProtect(typeArg.Formal.GetCompileName(compiler.Options));
+          if (!isTpSupported(typeArg.Formal, out var why)) {
+            compiler.AddUnsupported(why);
           }
 
-          astTypeArgs.Add((DAST.Type)DAST.Type.create_TypeArg(Sequence<Rune>.UnicodeFromString(compiler.IdProtect(typeArg.Formal.GetCompileName(compiler.Options)))));
+          astTypeArgs.Add((DAST.Type)DAST.Type.create_TypeArg(Sequence<Rune>.UnicodeFromString(compileName)));
         }
 
         List<DAST.Formal> params_ = new();
@@ -408,7 +458,7 @@ public ConcreteSyntaxTree CreateMethod(Method m, List<TypeArgumentInstantiation>
         methods.Add(builder);
 
         if (createBody) {
-          return new BuilderSyntaxTree<StatementContainer>(builder);
+          return new BuilderSyntaxTree<StatementContainer>(builder, this.compiler);
         } else {
           // TODO(shadaj): actually create a trait
           return null;
@@ -416,23 +466,26 @@ public ConcreteSyntaxTree CreateMethod(Method m, List<TypeArgumentInstantiation>
       }
 
       public ConcreteSyntaxTree SynthesizeMethod(Method m, List<TypeArgumentInstantiation> typeArgs, bool createBody, bool forBodyInheritance, bool lookasideBody) {
-        throw new UnsupportedFeatureException(Token.NoToken, Feature.MethodSynthesis);
+        compiler.AddUnsupportedFeature(m.tok, Feature.MethodSynthesis);
+        return new ConcreteSyntaxTree();
       }
 
       public ConcreteSyntaxTree CreateFunction(string name, List<TypeArgumentInstantiation> typeArgs,
           List<Formal> formals, Type resultType, IToken tok, bool isStatic, bool createBody, MemberDecl member,
           bool forBodyInheritance, bool lookasideBody) {
         if (isStatic && this.hasTypeArgs) {
-          ThrowGeneralUnsupported(); //("Static methods with type arguments");
+          compiler.AddUnsupported("<i>Static functions with type arguments</i>");
+          return new ConcreteSyntaxTree();
         }
 
         List<DAST.Type> astTypeArgs = new();
         foreach (var typeArg in typeArgs) {
-          if (!isTpSupported(typeArg.Formal)) {
-            ThrowGeneralUnsupported(); //("Contravariance in type parameters");
+          var compileName = compiler.IdProtect(typeArg.Formal.GetCompileName(compiler.Options));
+          if (!isTpSupported(typeArg.Formal, out var why)) {
+            compiler.AddUnsupported(why);
           }
 
-          astTypeArgs.Add((DAST.Type)DAST.Type.create_TypeArg(Sequence<Rune>.UnicodeFromString(compiler.IdProtect(typeArg.Formal.GetCompileName(compiler.Options)))));
+          astTypeArgs.Add((DAST.Type)DAST.Type.create_TypeArg(Sequence<Rune>.UnicodeFromString(compileName)));
         }
 
         List<DAST.Formal> params_ = new();
@@ -456,7 +509,7 @@ public ConcreteSyntaxTree CreateFunction(string name, List<TypeArgumentInstantia
         methods.Add(builder);
 
         if (createBody) {
-          return new BuilderSyntaxTree<StatementContainer>(builder);
+          return new BuilderSyntaxTree<StatementContainer>(builder, this.compiler);
         } else {
           return null;
         }
@@ -465,7 +518,8 @@ public ConcreteSyntaxTree CreateFunction(string name, List<TypeArgumentInstantia
       public ConcreteSyntaxTree CreateGetter(string name, TopLevelDecl enclosingDecl, Type resultType, IToken tok,
           bool isStatic, bool isConst, bool createBody, MemberDecl member, bool forBodyInheritance) {
         if (isStatic && this.hasTypeArgs) {
-          ThrowGeneralUnsupported(); //("Static fields with type arguments");
+          compiler.AddUnsupported("<i>Static fields with type arguments</i>");
+          return new ConcreteSyntaxTree();
         }
 
         var overridingTrait = member.OverriddenMember?.EnclosingClass;
@@ -482,7 +536,7 @@ public ConcreteSyntaxTree CreateGetter(string name, TopLevelDecl enclosingDecl,
         methods.Add(builder);
 
         if (createBody) {
-          return new BuilderSyntaxTree<StatementContainer>(builder);
+          return new BuilderSyntaxTree<StatementContainer>(builder, this.compiler);
         } else {
           return null;
         }
@@ -490,8 +544,14 @@ public ConcreteSyntaxTree CreateGetter(string name, TopLevelDecl enclosingDecl,
 
       public ConcreteSyntaxTree CreateGetterSetter(string name, Type resultType, IToken tok,
           bool createBody, MemberDecl member, out ConcreteSyntaxTree setterWriter, bool forBodyInheritance) {
-        ThrowGeneralUnsupported();
-        throw new InvalidOperationException();
+        compiler.AddUnsupported("<i>Create Getter Setter</i>");
+        if (createBody) {
+          setterWriter = new ConcreteSyntaxTree();
+          return new ConcreteSyntaxTree();
+        } else {
+          setterWriter = null;
+          return null;
+        }
       }
 
       public void DeclareField(string name, TopLevelDecl enclosingDecl, bool isStatic, bool isConst, Type type,
@@ -531,7 +591,7 @@ public void Finish() {
 
     protected override ConcreteSyntaxTree EmitReturnExpr(ConcreteSyntaxTree wr) {
       if (wr is BuilderSyntaxTree<StatementContainer> stmtContainer) {
-        return new BuilderSyntaxTree<ExprContainer>(stmtContainer.Builder.Return());
+        return new BuilderSyntaxTree<ExprContainer>(stmtContainer.Builder.Return(), this);
       } else {
         throw new InvalidOperationException();
       }
@@ -572,7 +632,7 @@ protected override ConcreteSyntaxTree EmitMethodReturns(Method m, ConcreteSyntax
     protected override ConcreteSyntaxTree EmitTailCallStructure(MemberDecl member, ConcreteSyntaxTree wr) {
       if (wr is BuilderSyntaxTree<StatementContainer> stmtContainer) {
         var recBuilder = stmtContainer.Builder.TailRecursive();
-        return new BuilderSyntaxTree<StatementContainer>(recBuilder);
+        return new BuilderSyntaxTree<StatementContainer>(recBuilder, this);
       } else {
         throw new InvalidOperationException();
       }
@@ -605,11 +665,11 @@ protected override string TypeInitializationValue(Type type, ConcreteSyntaxTree
         } else {
           if (type.AsNewtype != null && type.AsNewtype.WitnessKind == SubsetTypeDecl.WKind.Compiled) {
             var buf = new ExprBuffer(null);
-            EmitExpr(type.AsNewtype.Witness, false, new BuilderSyntaxTree<ExprContainer>(buf), null);
+            EmitExpr(type.AsNewtype.Witness, false, new BuilderSyntaxTree<ExprContainer>(buf, this), null);
             bufferedInitializationValue = Option<DAST._IExpression>.create_Some(buf.Finish());
           } else if (type.AsSubsetType != null && type.AsSubsetType.WitnessKind == SubsetTypeDecl.WKind.Compiled) {
             var buf = new ExprBuffer(null);
-            EmitExpr(type.AsSubsetType.Witness, false, new BuilderSyntaxTree<ExprContainer>(buf), null);
+            EmitExpr(type.AsSubsetType.Witness, false, new BuilderSyntaxTree<ExprContainer>(buf, this), null);
             bufferedInitializationValue = Option<DAST._IExpression>.create_Some(buf.Finish());
           } else if (type.AsDatatype != null && type.AsDatatype.Ctors.Count == 1 && type.AsDatatype.Ctors[0].EnclosingDatatype is TupleTypeDecl tupleDecl) {
             var elems = new List<DAST._IExpression>();
@@ -629,8 +689,11 @@ protected override string TypeInitializationValue(Type type, ConcreteSyntaxTree
               );
             }
           } else if (type.IsArrowType) {
-            ThrowGeneralUnsupported();
-            throw new InvalidOperationException();
+            if (emitUncompilableCode) {
+              this.AddUnsupported("<i>Initializer for arrow type</i>");
+            } else {
+              throw new UnsupportedInvalidOperationException("<i>Initializer for arrow type</i>");
+            }
           } else {
             bufferedInitializationValue = Option<DAST._IExpression>.create_Some(
               DAST.Expression.create_InitializationValue(GenType(type))
@@ -654,7 +717,7 @@ protected override string TypeName_Companion(Type type, ConcreteSyntaxTree wr, I
         throw new InvalidOperationException();
       }
 
-      EmitTypeName_Companion(type, new BuilderSyntaxTree<ExprContainer>(actualBuilder), wr, tok, member);
+      EmitTypeName_Companion(type, new BuilderSyntaxTree<ExprContainer>(actualBuilder, this), wr, tok, member);
       return "";
     }
 
@@ -666,6 +729,9 @@ protected override void EmitTypeName_Companion(Type type, ConcreteSyntaxTree wr,
             DatatypeWrapperEraser.IsErasableDatatypeWrapper(Options, dt, out _)) {
           container.Builder.AddExpr((DAST.Expression)DAST.Expression.create_Companion(PathFromTopLevel(udt.ResolvedClass)));
         } else {
+          if (type.AsTopLevelTypeWithMembers == null) { // git-issues/git-issue-697g.dfy while iterating over "nat"
+            throw new UnsupportedFeatureException(tok, Feature.RunAllTests);
+          }
           container.Builder.AddExpr((DAST.Expression)DAST.Expression.create_Companion(PathFromTopLevel(type.AsTopLevelTypeWithMembers)));
         }
       } else {
@@ -674,12 +740,16 @@ protected override void EmitTypeName_Companion(Type type, ConcreteSyntaxTree wr,
     }
 
     protected override void EmitNameAndActualTypeArgs(string protectedName, List<Type> typeArgs, IToken tok, ConcreteSyntaxTree wr) {
-      if (wr is BuilderSyntaxTree<ExprContainer> st && st.Builder is CallExprBuilder callExpr) {
-        callExpr.SetName(protectedName);
-      } else if (wr is BuilderSyntaxTree<ExprContainer> st2 && st2.Builder is CallStmtBuilder callStmt) {
-        callStmt.SetName(protectedName);
+      if (GetExprBuilder(wr, out var st) && st.Builder is CallExprBuilder callExpr) {
+        callExpr.SetName((DAST.CallName)DAST.CallName.create_Name(Sequence<Rune>.UnicodeFromString(protectedName)));
+      } else if (GetExprBuilder(wr, out var st2) && st2.Builder is CallStmtBuilder callStmt) {
+        callStmt.SetName((DAST.CallName)DAST.CallName.create_Name(Sequence<Rune>.UnicodeFromString(protectedName)));
       } else {
-        ThrowGeneralUnsupported();
+        AddUnsupported("Builder issue: wr is as " + wr.GetType() +
+                                (GetExprBuilder(wr, out var st3) ?
+                                  " and its builder is a " + st3.Builder.GetType() : ""
+                                  ));
+        return;
       }
 
       base.EmitNameAndActualTypeArgs(protectedName, typeArgs, tok, wr);
@@ -691,8 +761,8 @@ protected override void TypeArgDescriptorUse(bool isStatic, bool lookasideBody,
     }
 
     protected override bool DeclareFormal(string prefix, string name, Type type, IToken tok, bool isInParam, ConcreteSyntaxTree wr) {
-      ThrowGeneralUnsupported();
-      throw new InvalidOperationException();
+      AddUnsupported("<i>Declare formal</i>");
+      return true;
     }
 
     protected override void DeclareLocalVar(string name, Type type, IToken tok, bool leaveRoomForRhs, string rhs,
@@ -709,7 +779,8 @@ protected override void DeclareLocalVar(string name, Type type, IToken tok, bool
           }
         } else if (rhs == "BUFFERED") {
           if (bufferedInitializationValue == null) {
-            throw new InvalidOperationException("Expected a buffered value to have been populated because rhs != null");
+            throw new InvalidOperationException(
+              "Expected a buffered value to have been populated because rhs != null");
           }
 
           var rhsValue = bufferedInitializationValue;
@@ -733,7 +804,7 @@ protected override void DeclareLocalVar(string name, Type type, IToken tok, bool
     protected override ConcreteSyntaxTree DeclareLocalVar(string name, Type type, IToken tok, ConcreteSyntaxTree wr) {
       if (wr is BuilderSyntaxTree<StatementContainer> stmtContainer) {
         var variable = stmtContainer.Builder.DeclareAndAssign(GenType(type), name);
-        return new BuilderSyntaxTree<ExprContainer>(variable);
+        return new BuilderSyntaxTree<ExprContainer>(variable, this);
       } else {
         throw new InvalidOperationException();
       }
@@ -748,7 +819,7 @@ protected override void DeclareLocalOutVar(string name, Type type, IToken tok, s
     }
 
     protected override void EmitCallReturnOuts(List<string> outTmps, ConcreteSyntaxTree wr) {
-      if (wr is BuilderSyntaxTree<ExprContainer> builder && builder.Builder is CallStmtBuilder call) {
+      if (GetExprBuilder(wr, out var builder) && builder.Builder is CallStmtBuilder call) {
         call.SetOuts(outTmps.Select(i => Sequence<Rune>.UnicodeFromString(i)).ToList());
       } else {
         throw new InvalidOperationException();
@@ -761,7 +832,7 @@ protected override void TrCallStmt(CallStmt s, string receiverReplacement, Concr
           base.TrCallStmt(s, receiverReplacement, wr, wrStmts, wrStmtsAfterCall);
         } else {
           var callBuilder = stmtContainer.Builder.Call();
-          base.TrCallStmt(s, receiverReplacement, new BuilderSyntaxTree<ExprContainer>(callBuilder), wrStmts, wrStmtsAfterCall);
+          base.TrCallStmt(s, receiverReplacement, new BuilderSyntaxTree<ExprContainer>(callBuilder, this), wrStmts, wrStmtsAfterCall);
         }
       } else {
         throw new InvalidOperationException("Cannot call statement in this context: " + currentBuilder);
@@ -771,9 +842,9 @@ protected override void TrCallStmt(CallStmt s, string receiverReplacement, Concr
     protected override void EmitCallToInheritedMethod(Method method, [CanBeNull] TopLevelDeclWithMembers heir, ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts, ConcreteSyntaxTree wStmtsAfterCall) {
       if (wr is BuilderSyntaxTree<StatementContainer> stmtContainer) {
         var callBuilder = stmtContainer.Builder.Call();
-        base.EmitCallToInheritedMethod(method, heir, new BuilderSyntaxTree<ExprContainer>(callBuilder), wStmts, wStmtsAfterCall);
+        base.EmitCallToInheritedMethod(method, heir, new BuilderSyntaxTree<ExprContainer>(callBuilder, this), wStmts, wStmtsAfterCall);
       } else {
-        throw new InvalidOperationException("Cannot call statement in this context: " + currentBuilder);
+        AddUnsupported("<i>Cannot call statement in this context</i>: " + currentBuilder);
       }
     }
 
@@ -788,16 +859,16 @@ protected override void CompileFunctionCallExpr(FunctionCallExpr e, ConcreteSynt
 
       if (wr is BuilderSyntaxTree<ExprContainer> builder) {
         var callBuilder = builder.Builder.Call();
-        base.CompileFunctionCallExpr(e, new BuilderSyntaxTree<ExprContainer>(callBuilder), inLetExprBody, wStmts, tr, true);
+        base.CompileFunctionCallExpr(e, new BuilderSyntaxTree<ExprContainer>(callBuilder, this), inLetExprBody, wStmts, tr, true);
       } else {
         throw new InvalidOperationException("Cannot call function in this context: " + currentBuilder);
       }
     }
 
     protected override void EmitActualTypeArgs(List<Type> typeArgs, IToken tok, ConcreteSyntaxTree wr) {
-      if (wr is BuilderSyntaxTree<ExprContainer> st && st.Builder is CallExprBuilder callExpr) {
+      if (GetExprBuilder(wr, out var st) && st.Builder is CallExprBuilder callExpr) {
         callExpr.SetTypeArgs(typeArgs.Select(GenType).ToList());
-      } else if (wr is BuilderSyntaxTree<ExprContainer> st2 && st2.Builder is CallStmtBuilder callStmt) {
+      } else if (GetExprBuilder(wr, out var st2) && st2.Builder is CallStmtBuilder callStmt) {
         callStmt.SetTypeArgs(typeArgs.Select(GenType).ToList());
       } else {
         throw new InvalidOperationException("Cannot emit actual type args in this context: " + currentBuilder);
@@ -806,9 +877,11 @@ protected override void EmitActualTypeArgs(List<Type> typeArgs, IToken tok, Conc
 
     private class BuilderLvalue : ILvalue {
       readonly string name;
+      private readonly DafnyCodeGenerator compiler;
 
-      public BuilderLvalue(string name) {
+      public BuilderLvalue(string name, DafnyCodeGenerator compiler) {
         this.name = name;
+        this.compiler = compiler;
       }
 
       public void EmitRead(ConcreteSyntaxTree wr) {
@@ -819,7 +892,7 @@ public ConcreteSyntaxTree EmitWrite(ConcreteSyntaxTree wr) {
         if (wr is BuilderSyntaxTree<StatementContainer> stmtContainer) {
           var assign = stmtContainer.Builder.Assign();
           assign.AddLhs((DAST.AssignLhs)DAST.AssignLhs.create_Ident(Sequence<Rune>.UnicodeFromString(name)));
-          return new BuilderSyntaxTree<ExprContainer>(assign);
+          return new BuilderSyntaxTree<ExprContainer>(assign, this.compiler);
         } else {
           throw new InvalidOperationException();
         }
@@ -829,17 +902,19 @@ public ConcreteSyntaxTree EmitWrite(ConcreteSyntaxTree wr) {
     private class ExprLvalue : ILvalue {
       readonly DAST.Expression expr;
       readonly DAST.AssignLhs assignExpr;
+      private readonly DafnyCodeGenerator compiler;
 
-      public ExprLvalue(DAST.Expression expr, DAST.AssignLhs assignExpr) {
+      public ExprLvalue(DAST.Expression expr, DAST.AssignLhs assignExpr, DafnyCodeGenerator compiler) {
         this.expr = expr;
         this.assignExpr = assignExpr;
+        this.compiler = compiler;
       }
 
       public void EmitRead(ConcreteSyntaxTree wr) {
-        if (wr is BuilderSyntaxTree<ExprContainer> exprContainer) {
+        if (GetExprBuilder(wr, out var exprContainer)) {
           exprContainer.Builder.AddExpr(expr);
         } else {
-          throw new InvalidOperationException();
+          compiler.AddUnsupported("<i>EmitRead</i> without ExprContainer builder");
         }
       }
 
@@ -851,7 +926,7 @@ public ConcreteSyntaxTree EmitWrite(ConcreteSyntaxTree wr) {
         if (wr is BuilderSyntaxTree<StatementContainer> stmtContainer) {
           var assign = stmtContainer.Builder.Assign();
           assign.AddLhs(assignExpr);
-          return new BuilderSyntaxTree<ExprContainer>(assign);
+          return new BuilderSyntaxTree<ExprContainer>(assign, this.compiler);
         } else {
           throw new InvalidOperationException();
         }
@@ -863,7 +938,7 @@ protected override void EmitAssignment(string lhs, Type/*?*/ lhsType, string rhs
     }
 
     protected override ILvalue IdentLvalue(string var) {
-      return new BuilderLvalue(var);
+      return new BuilderLvalue(var, this);
     }
 
     protected override ILvalue SeqSelectLvalue(SeqSelectExpr ll, ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
@@ -873,13 +948,13 @@ protected override ILvalue SeqSelectLvalue(SeqSelectExpr ll, ConcreteSyntaxTree
         EmitCoercionIfNecessary(
           ll.Seq.Type,
           ll.Seq.Type.IsNonNullRefType || !ll.Seq.Type.IsRefType ? null : UserDefinedType.CreateNonNullType((UserDefinedType)ll.Seq.Type.NormalizeExpand()),
-          null, new BuilderSyntaxTree<ExprContainer>(sourceBuf)
+          null, new BuilderSyntaxTree<ExprContainer>(sourceBuf, this)
         ),
         wStmts
       );
 
       var indexBuf = new ExprBuffer(null);
-      EmitExpr(ll.E0, false, new BuilderSyntaxTree<ExprContainer>(indexBuf), wStmts);
+      EmitExpr(ll.E0, false, new BuilderSyntaxTree<ExprContainer>(indexBuf, this), wStmts);
 
       var source = sourceBuf.Finish();
       var index = indexBuf.Finish();
@@ -896,19 +971,19 @@ protected override ILvalue SeqSelectLvalue(SeqSelectExpr ll, ConcreteSyntaxTree
 
       return new ExprLvalue(
         (DAST.Expression)DAST.Expression.create_Index(source, collKind, Sequence<DAST.Expression>.FromElements(index)),
-        (DAST.AssignLhs)DAST.AssignLhs.create_Index(source, Sequence<DAST.Expression>.FromElements(index))
+        (DAST.AssignLhs)DAST.AssignLhs.create_Index(source, Sequence<DAST.Expression>.FromElements(index)),
+        this
       );
     }
 
     protected override ILvalue MultiSelectLvalue(MultiSelectExpr ll, ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
-      ThrowGeneralUnsupported();
-      throw new InvalidOperationException();
+      throw new UnsupportedFeatureException(ll.tok, Feature.MultiDimensionalArrays);
     }
 
     protected override void EmitPrintStmt(ConcreteSyntaxTree wr, Expression arg) {
       if (wr is BuilderSyntaxTree<StatementContainer> stmtContainer) {
         ExprBuffer buffer = new(null);
-        EmitExpr(arg, false, new BuilderSyntaxTree<ExprContainer>(buffer), wr);
+        EmitExpr(arg, false, new BuilderSyntaxTree<ExprContainer>(buffer, this), wr);
         stmtContainer.Builder.Print(buffer.Finish());
       } else {
         throw new InvalidOperationException("Cannot print outside of a statement container: " + currentBuilder);
@@ -926,7 +1001,7 @@ protected override void EmitReturn(List<Formal> outParams, ConcreteSyntaxTree wr
     protected override ConcreteSyntaxTree CreateLabeledCode(string label, bool createContinueLabel, ConcreteSyntaxTree wr) {
       if (wr is BuilderSyntaxTree<StatementContainer> stmtContainer) {
         var labelBuilder = stmtContainer.Builder.Labeled((createContinueLabel ? "continue_" : "goto_") + label);
-        return new BuilderSyntaxTree<StatementContainer>(labelBuilder);
+        return new BuilderSyntaxTree<StatementContainer>(labelBuilder, this);
       } else {
         throw new InvalidOperationException();
       }
@@ -953,7 +1028,7 @@ protected override void EmitContinue(string label, ConcreteSyntaxTree wr) {
     }
 
     protected override void EmitYield(ConcreteSyntaxTree wr) {
-      throw new UnsupportedFeatureException(Token.NoToken, Feature.Iterators);
+      AddUnsupportedFeature(Token.NoToken, Feature.Iterators);
     }
 
     protected override void EmitAbsurd(string message, ConcreteSyntaxTree wr) {
@@ -980,7 +1055,7 @@ protected override ConcreteSyntaxTree EmitIf(out ConcreteSyntaxTree guardWriter,
         var containingBuilder = statementContainer.Builder;
         if (elseBuilderStack.Count > 0 && elseBuilderStack.Peek().Item2 == statementContainer.Builder) {
           var popped = elseBuilderStack.Pop();
-          statementContainer = new BuilderSyntaxTree<StatementContainer>(popped.Item1);
+          statementContainer = new BuilderSyntaxTree<StatementContainer>(popped.Item1, this);
           containingBuilder = popped.Item2;
         }
 
@@ -989,8 +1064,8 @@ protected override ConcreteSyntaxTree EmitIf(out ConcreteSyntaxTree guardWriter,
           elseBuilderStack.Push((ifBuilder.Else(), containingBuilder));
         }
 
-        guardWriter = new BuilderSyntaxTree<ExprContainer>(ifBuilder);
-        return new BuilderSyntaxTree<StatementContainer>(ifBuilder);
+        guardWriter = new BuilderSyntaxTree<ExprContainer>(ifBuilder, this);
+        return new BuilderSyntaxTree<StatementContainer>(ifBuilder, this);
       } else {
         throw new InvalidOperationException();
       }
@@ -999,7 +1074,7 @@ protected override ConcreteSyntaxTree EmitIf(out ConcreteSyntaxTree guardWriter,
     protected override ConcreteSyntaxTree EmitBlock(ConcreteSyntaxTree wr) {
       if (wr is BuilderSyntaxTree<StatementContainer> statementContainer) {
         if (elseBuilderStack.Count > 0 && elseBuilderStack.Peek().Item2 == statementContainer.Builder) {
-          return new BuilderSyntaxTree<StatementContainer>(elseBuilderStack.Pop().Item1);
+          return new BuilderSyntaxTree<StatementContainer>(elseBuilderStack.Pop().Item1, this);
         } else {
           return wr.Fork();
         }
@@ -1010,44 +1085,47 @@ protected override ConcreteSyntaxTree EmitBlock(ConcreteSyntaxTree wr) {
 
     protected override ConcreteSyntaxTree EmitForStmt(IToken tok, IVariable loopIndex, bool goingUp, string endVarName,
       List<Statement> body, LList<Label> labels, ConcreteSyntaxTree wr) {
-      throw new UnsupportedFeatureException(Token.NoToken, Feature.ForLoops);
+      AddUnsupportedFeature(tok, Feature.ForLoops);
+      return wr;
     }
 
     protected override ConcreteSyntaxTree CreateWhileLoop(out ConcreteSyntaxTree guardWriter, ConcreteSyntaxTree wr) {
       if (wr is BuilderSyntaxTree<StatementContainer> statementContainer) {
         var whileBuilder = statementContainer.Builder.While();
-        guardWriter = new BuilderSyntaxTree<ExprContainer>(whileBuilder);
-        return new BuilderSyntaxTree<StatementContainer>(whileBuilder);
+        guardWriter = new BuilderSyntaxTree<ExprContainer>(whileBuilder, this);
+        return new BuilderSyntaxTree<StatementContainer>(whileBuilder, this);
       } else {
         throw new InvalidOperationException();
       }
     }
 
     protected override ConcreteSyntaxTree CreateForLoop(string indexVar, Action<ConcreteSyntaxTree> bound, ConcreteSyntaxTree wr, string start = null) {
-      throw new UnsupportedFeatureException(Token.NoToken, Feature.ForLoops);
+      AddUnsupportedFeature(Token.NoToken, Feature.ForLoops);
+      return wr;
     }
 
     protected override ConcreteSyntaxTree CreateDoublingForLoop(string indexVar, int start, ConcreteSyntaxTree wr) {
-      throw new UnsupportedFeatureException(Token.NoToken, Feature.ForLoops);
+      AddUnsupportedFeature(Token.NoToken, Feature.ForLoops);
+      return wr;
     }
 
     protected override void EmitIncrementVar(string varName, ConcreteSyntaxTree wr) {
-      ThrowGeneralUnsupported();
+      AddUnsupported("<i>EmitIncrementVar</i>");
     }
 
     protected override void EmitDecrementVar(string varName, ConcreteSyntaxTree wr) {
-      ThrowGeneralUnsupported();
+      AddUnsupported("<i>EmitDecrementVar</i>");
     }
 
     protected override ConcreteSyntaxTree EmitQuantifierExpr(Action<ConcreteSyntaxTree> collection, bool isForall, Type collectionElementType, BoundVar bv, ConcreteSyntaxTree wr) {
-      if (wr is BuilderSyntaxTree<ExprContainer> builder) {
+      if (GetExprBuilder(wr, out var builder)) {
         var collectionBuf = new ExprBuffer(null);
-        collection(new BuilderSyntaxTree<ExprContainer>(collectionBuf));
+        collection(new BuilderSyntaxTree<ExprContainer>(collectionBuf, this));
         var collectionAST = collectionBuf.Finish();
 
         builder.Builder.AddExpr((DAST.Expression)DAST.Expression.create_Literal(DAST.Literal.create_BoolLiteral(false)));
 
-        return new BuilderSyntaxTree<ExprContainer>(new ExprBuffer(null));
+        return new BuilderSyntaxTree<ExprContainer>(new ExprBuffer(null), this);
       } else {
         throw new InvalidOperationException();
       }
@@ -1061,8 +1139,8 @@ protected override ConcreteSyntaxTree CreateForeachLoop(string tmpVarName, Type
       out ConcreteSyntaxTree collectionWriter, ConcreteSyntaxTree wr) {
       if (wr is BuilderSyntaxTree<StatementContainer> statementContainer) {
         var foreachBuilder = statementContainer.Builder.Foreach(tmpVarName, GenType(collectionElementType));
-        collectionWriter = new BuilderSyntaxTree<ExprContainer>(foreachBuilder);
-        return new BuilderSyntaxTree<StatementContainer>(foreachBuilder);
+        collectionWriter = new BuilderSyntaxTree<ExprContainer>(foreachBuilder, this);
+        return new BuilderSyntaxTree<StatementContainer>(foreachBuilder, this);
       } else {
         throw new InvalidOperationException();
       }
@@ -1080,12 +1158,12 @@ protected override void EmitDowncastVariableAssignment(string boundVarName, Type
 
     protected override ConcreteSyntaxTree CreateForeachIngredientLoop(string boundVarName, int L, string tupleTypeArgs,
         out ConcreteSyntaxTree collectionWriter, ConcreteSyntaxTree wr) {
-      ThrowGeneralUnsupported();
+      AddUnsupported("<i>CreateForeachIngredientLoop</i>");
       throw new InvalidOperationException();
     }
 
     protected override void EmitNew(Type type, IToken tok, CallStmt initCall, ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
-      if (wr is BuilderSyntaxTree<ExprContainer> builder) {
+      if (GetExprConverter(wr, wStmts, out var builder, out var convert)) {
         var ctor = (Constructor)initCall?.Method;
         var arguments = Enumerable.Empty<DAST.Expression>();
         if (ctor != null && ctor.IsExtern(Options, out _, out _)) {
@@ -1094,7 +1172,7 @@ protected override void EmitNew(Type type, IToken tok, CallStmt initCall, Concre
             .Where(tp => !tp.f.IsGhost)
             .Select(tp => {
               var buf = new ExprBuffer(null);
-              var localWriter = new BuilderSyntaxTree<ExprContainer>(buf);
+              var localWriter = new BuilderSyntaxTree<ExprContainer>(buf, this);
               EmitExpr(initCall.Args[tp.i], false, localWriter, wStmts);
               return buf.Finish();
             });
@@ -1118,13 +1196,8 @@ protected override void EmitNewArray(Type elementType, IToken tok, List<string>
     }
 
     protected override void EmitNewArray(Type elementType, IToken tok, List<Expression> dimensions, bool mustInitialize, [CanBeNull] string exampleElement, ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
-      if (wr is BuilderSyntaxTree<ExprContainer> builder) {
-        var dimensionsAST = dimensions.Select(d => {
-          var buf = new ExprBuffer(null);
-          var localWriter = new BuilderSyntaxTree<ExprContainer>(buf);
-          EmitExpr(d, false, localWriter, wStmts);
-          return buf.Finish();
-        }).ToArray();
+      if (GetExprConverter(wr, wStmts, out var builder, out var convert)) {
+        var dimensionsAST = dimensions.Select(convert).ToArray();
 
         builder.Builder.AddExpr((DAST.Expression)DAST.Expression.create_NewArray(
           Sequence<DAST.Expression>.FromArray(dimensionsAST),
@@ -1136,17 +1209,17 @@ protected override void EmitNewArray(Type elementType, IToken tok, List<Expressi
     }
 
     protected override void EmitIdentifier(string ident, ConcreteSyntaxTree wr) {
-      if (wr is BuilderSyntaxTree<ExprContainer> builder) {
+      if (GetExprBuilder(wr, out var builder)) {
         builder.Builder.AddExpr((DAST.Expression)DAST.Expression.create_Ident(
           Sequence<Rune>.UnicodeFromString(ident)
         ));
       } else {
-        throw new InvalidOperationException("Expected ExprContainer, got " + wr.GetType());
+        AddUnsupported("Expected ExprContainer, got " + wr.GetType());
       }
     }
 
     protected override void EmitLiteralExpr(ConcreteSyntaxTree wr, LiteralExpr e) {
-      if (wr is BuilderSyntaxTree<ExprContainer> builder) {
+      if (GetExprBuilder(wr, out var builder)) {
         DAST.Expression baseExpr;
 
         switch (e) {
@@ -1157,8 +1230,8 @@ protected override void EmitLiteralExpr(ConcreteSyntaxTree wr, LiteralExpr e) {
                 new Rune(codePoint)
               ));
             } else {
-              ThrowGeneralUnsupported();
-              throw new InvalidOperationException();
+              AddUnsupported("<i>Char literal without unicode char enabled</i>");
+              return;
             }
             break;
           case StringLiteralExpr str:
@@ -1223,41 +1296,43 @@ protected override void EmitLiteralExpr(ConcreteSyntaxTree wr, LiteralExpr e) {
         }
 
         builder.Builder.AddExpr(baseExpr);
+      } else if (emitUncompilableCode && GetStatementBuilder(wr, out var builder2)) {
+        builder2.Builder.AddStatement(StatementContainer.UnsupportedToStatement($"Cannot emit literal expression {e} outside of expression context: " + wr.GetType()));
       } else {
         throw new InvalidOperationException("Cannot emit literal expression outside of expression context: " + wr.GetType());
       }
     }
 
     protected override void EmitStringLiteral(string str, bool isVerbatim, ConcreteSyntaxTree wr) {
-      ThrowGeneralUnsupported();
-      throw new InvalidOperationException();
+      throw new UnsupportedInvalidOperationException("<i>EmitStringLiteral</i>");
     }
 
     protected override ConcreteSyntaxTree EmitBitvectorTruncation(BitvectorType bvType, [CanBeNull] NativeType nativeType,
       bool surroundByUnchecked, ConcreteSyntaxTree wr) {
-      ThrowGeneralUnsupported();
-      throw new InvalidOperationException();
+      throw new UnsupportedInvalidOperationException("<i>EmitBitvectorTruncation</i>");
     }
 
     protected override void EmitRotate(Expression e0, Expression e1, bool isRotateLeft, ConcreteSyntaxTree wr,
         bool inLetExprBody, ConcreteSyntaxTree wStmts, FCE_Arg_Translator tr) {
-      throw new UnsupportedFeatureException(e0.tok, Feature.BitvectorRotateFunctions);
+      AddUnsupportedFeature(e0.tok, Feature.BitvectorRotateFunctions);
     }
 
     protected override void EmitEmptyTupleList(string tupleTypeArgs, ConcreteSyntaxTree wr) {
-      throw new UnsupportedFeatureException(Token.NoToken, Feature.NonSequentializableForallStatements);
+      AddUnsupportedFeature(Token.NoToken, Feature.NonSequentializableForallStatements);
     }
 
     protected override ConcreteSyntaxTree EmitIngredients(ConcreteSyntaxTree wr, string ingredients, int L,
       string tupleTypeArgs, ForallStmt s, AssignStmt s0, Expression rhs) {
-      throw new UnsupportedFeatureException(Token.NoToken, Feature.NonSequentializableForallStatements);
+      AddUnsupportedFeature(Token.NoToken, Feature.NonSequentializableForallStatements);
+      return wr;
     }
     protected override ConcreteSyntaxTree EmitAddTupleToList(string ingredients, string tupleTypeArgs, ConcreteSyntaxTree wr) {
-      throw new UnsupportedFeatureException(Token.NoToken, Feature.NonSequentializableForallStatements);
+      AddUnsupportedFeature(Token.NoToken, Feature.NonSequentializableForallStatements);
+      return wr;
     }
 
     protected override void EmitTupleSelect(string prefix, int i, ConcreteSyntaxTree wr) {
-      throw new UnsupportedFeatureException(Token.NoToken, Feature.NonSequentializableForallStatements);
+      AddUnsupportedFeature(Token.NoToken, Feature.NonSequentializableForallStatements);
     }
 
     protected override string IdProtect(string name) {
@@ -1269,7 +1344,7 @@ public override string PublicIdProtect(string name) {
     }
 
     protected override string FullTypeName(UserDefinedType udt, MemberDecl member = null) {
-      ThrowGeneralUnsupported();
+      AddUnsupported("<i>FullTypeName</i>");
       throw new InvalidOperationException();
     }
 
@@ -1310,6 +1385,22 @@ private ISequence<ISequence<Rune>> PathFromTopLevel(TopLevelDecl topLevel) {
       return Sequence<ISequence<Rune>>.FromArray(path.ToArray());
     }
 
+    private DAST.NewtypeRange NativeTypeToNewtypeRange(NativeType nativeType) {
+      return (DAST.NewtypeRange)(nativeType?.Sel switch {
+        NativeType.Selection.Byte => NewtypeRange.create_U8(),
+        NativeType.Selection.SByte => NewtypeRange.create_I8(),
+        NativeType.Selection.UShort => NewtypeRange.create_U16(),
+        NativeType.Selection.Short => NewtypeRange.create_I16(),
+        NativeType.Selection.UInt => NewtypeRange.create_U32(),
+        NativeType.Selection.Int => NewtypeRange.create_I32(),
+        NativeType.Selection.ULong => NewtypeRange.create_U64(),
+        NativeType.Selection.Long => NewtypeRange.create_I64(),
+        NativeType.Selection.UDoubleLong => NewtypeRange.create_U128(),
+        NativeType.Selection.DoubleLong => NewtypeRange.create_I128(),
+        _ => NewtypeRange.create_NoRange()
+      });
+    }
+
     private DAST.Type TypeNameASTFromTopLevel(TopLevelDecl topLevel, List<Type> typeArgs) {
       var path = PathFromTopLevel(topLevel);
 
@@ -1322,22 +1413,27 @@ private DAST.Type TypeNameASTFromTopLevel(TopLevelDecl topLevel, List<Type> type
 
       ResolvedType resolvedType;
       if (topLevel is NewtypeDecl newType) {
-        resolvedType = (DAST.ResolvedType)DAST.ResolvedType.create_Newtype(GenType(EraseNewtypeLayers(topLevel)));
-      } else if (topLevel is SubsetTypeDecl subsetType) {
-        resolvedType = (DAST.ResolvedType)DAST.ResolvedType.create_Newtype(GenType(EraseNewtypeLayers(topLevel)));
-      } else if (topLevel is TypeSynonymDecl typeSynonym) {
-        resolvedType = (DAST.ResolvedType)DAST.ResolvedType.create_Newtype(GenType(EraseNewtypeLayers(topLevel)));
+        var range = NativeTypeToNewtypeRange(newType.NativeType);
+        resolvedType = (DAST.ResolvedType)DAST.ResolvedType.create_Newtype(
+          GenType(EraseNewtypeLayers(topLevel)), range, true);
+      } else if (topLevel is TypeSynonymDecl typeSynonym) { // Also SubsetTypeDecl
+        resolvedType = (DAST.ResolvedType)DAST.ResolvedType.create_Newtype(GenType(EraseNewtypeLayers(topLevel)), NewtypeRange.create_NoRange(), true);
       } else if (topLevel is TraitDecl) {
-        throw new UnsupportedFeatureException(Token.NoToken, Feature.Traits);
+        AddUnsupportedFeature(Token.NoToken, Feature.Traits);
+        resolvedType = (DAST.ResolvedType)DAST.ResolvedType.create_Newtype(
+          DAST.Type.create_Passthrough(Sequence<Rune>.UnicodeFromString("<b>Unsupported: <i>Traits</i></b>")),
+          NewtypeRange.create_NoRange(), true
+        );
         // traits need a bit more work
 
         // resolvedType = (DAST.ResolvedType)DAST.ResolvedType.create_Trait(path);
       } else if (topLevel is DatatypeDecl) {
         resolvedType = (DAST.ResolvedType)DAST.ResolvedType.create_Datatype(path);
       } else if (topLevel is ClassDecl) {
-        // TODO(shadaj): have a separate type when we properly support classes
+        // TODO(Mikael): have a separate type when we properly support classes
         resolvedType = (DAST.ResolvedType)DAST.ResolvedType.create_Datatype(path);
       } else {
+        // SubsetTypeDecl are covered by TypeSynonymDecl
         throw new InvalidOperationException(topLevel.GetType().ToString());
       }
 
@@ -1361,7 +1457,7 @@ private static Type EraseNewtypeLayers(TopLevelDecl topLevel) {
 
     public override ConcreteSyntaxTree Expr(Expression expr, bool inLetExprBody, ConcreteSyntaxTree wStmts) {
       if (currentBuilder is ExprContainer container) {
-        EmitExpr(expr, inLetExprBody, new BuilderSyntaxTree<ExprContainer>(container), wStmts);
+        EmitExpr(expr, inLetExprBody, new BuilderSyntaxTree<ExprContainer>(container, this), wStmts);
         return new ConcreteSyntaxTree();
       } else {
         throw new InvalidOperationException();
@@ -1372,7 +1468,7 @@ public override void EmitExpr(Expression expr, bool inLetExprBody, ConcreteSynta
       var actualWr = wr;
       if (currentBuilder is ExprBuffer buf && wr is not BuilderSyntaxTree<ExprContainer>) {
         // the writers are not currently wired properly for DatatypeValue
-        actualWr = new BuilderSyntaxTree<ExprContainer>(buf);
+        actualWr = new BuilderSyntaxTree<ExprContainer>(buf, this);
       }
 
       if (expr is DatatypeValue) {
@@ -1393,14 +1489,14 @@ public override void EmitExpr(Expression expr, bool inLetExprBody, ConcreteSynta
         // we don't need to create a copy of the identifier, that's language specific
         base.EmitExpr(expr, false, actualWr, wStmts);
       } else if (expr is QuantifierExpr) {
-        throw new UnsupportedFeatureException(expr.tok, Feature.SubtypeConstraintsInQuantifiers);
+        AddUnsupported("<i>QuantifierExpr</i>");
       } else {
         base.EmitExpr(expr, inLetExprBody, actualWr, wStmts);
       }
     }
 
     protected override void EmitThis(ConcreteSyntaxTree wr, bool callToInheritedMember) {
-      if (wr is BuilderSyntaxTree<ExprContainer> builder) {
+      if (GetExprBuilder(wr, out var builder)) {
         builder.Builder.AddExpr((DAST.Expression)DAST.Expression.create_This());
       } else {
         throw new InvalidOperationException();
@@ -1408,7 +1504,7 @@ protected override void EmitThis(ConcreteSyntaxTree wr, bool callToInheritedMemb
     }
 
     protected override void EmitDatatypeValue(DatatypeValue dtv, string typeDescriptorArguments, string arguments, ConcreteSyntaxTree wr) {
-      if (wr is BuilderSyntaxTree<ExprContainer> builder && currentBuilder is ExprBuffer buf) {
+      if (GetExprBuilder(wr, out var builder) && currentBuilder is ExprBuffer buf) {
         List<DAST.Expression> contents = buf.PopAll();
         currentBuilder = buf.parent; // pop early to make sure the receiving builder is in the expected state
         List<_System._ITuple2<ISequence<Rune>, DAST.Expression>> namedContents = new();
@@ -1430,7 +1526,15 @@ protected override void EmitDatatypeValue(DatatypeValue dtv, string typeDescript
         }
 
         if (argI != contents.Count) {
-          throw new InvalidOperationException("Datatype constructor " + dtv.Ctor.Name + " expects " + dtv.Ctor.Formals.Count + " arguments, but " + contents.Count + " were provided");
+          contents.Insert(0,
+            ExprContainer.UnsupportedToExpr(
+              "Datatype constructor "
+              + dtv.Ctor.Name + " expects " + dtv.Ctor.Formals.Count + " arguments, but "
+              + contents.Count + " were provided"));
+          builder.Builder.AddExpr((DAST.Expression)DAST.Expression.create_Tuple(
+            Sequence<DAST.Expression>.FromArray(contents.ToArray())
+            ));
+          return;
         }
 
         if (dtv.Ctor.EnclosingDatatype is TupleTypeDecl tupleDecl) {
@@ -1464,9 +1568,13 @@ protected override void GetSpecialFieldInfo(SpecialField.ID id, object idParam,
           break;
         case SpecialField.ID.ArrayLength:
           break;
+        case SpecialField.ID.Keys:
+          break;
+        case SpecialField.ID.Values:
+          break;
         default:
-          ThrowGeneralUnsupported(); //("Special field: " + id);
-          throw new InvalidOperationException();
+          AddUnsupported("<i>Special field: " + id + "</i>");
+          break;//throw new InvalidOperationException();
       }
     }
 
@@ -1478,19 +1586,19 @@ protected override ILvalue EmitMemberSelect(Action<ConcreteSyntaxTree> obj, Type
       var memberStatus = DatatypeWrapperEraser.GetMemberStatus(Options, member);
 
       if (memberStatus == DatatypeWrapperEraser.MemberCompileStatus.Identity) {
-        obj(new BuilderSyntaxTree<ExprContainer>(objReceiver));
+        obj(new BuilderSyntaxTree<ExprContainer>(objReceiver, this));
         var objExpr = objReceiver.Finish();
-        return new ExprLvalue(objExpr, null);
+        return new ExprLvalue(objExpr, null, this);
       } else if (memberStatus == DatatypeWrapperEraser.MemberCompileStatus.AlwaysTrue) {
-        return new ExprLvalue((DAST.Expression)DAST.Expression.create_Literal(DAST.Literal.create_BoolLiteral(true)), null);
+        return new ExprLvalue((DAST.Expression)DAST.Expression.create_Literal(DAST.Literal.create_BoolLiteral(true)), null, this);
       } else if (member is DatatypeDestructor dtor) {
-        obj(new BuilderSyntaxTree<ExprContainer>(objReceiver));
+        obj(new BuilderSyntaxTree<ExprContainer>(objReceiver, this));
         var objExpr = objReceiver.Finish();
         if (dtor.EnclosingClass is TupleTypeDecl) {
           return new ExprLvalue((DAST.Expression)DAST.Expression.create_TupleSelect(
             objExpr,
             int.Parse(dtor.CorrespondingFormals[0].NameForCompilation)
-          ), null);
+          ), null, this);
         } else {
           return new ExprLvalue((DAST.Expression)DAST.Expression.create_Select(
             objExpr,
@@ -1500,22 +1608,32 @@ member.EnclosingClass is DatatypeDecl
           ), (DAST.AssignLhs)DAST.AssignLhs.create_Select(
             objExpr,
             Sequence<Rune>.UnicodeFromString(member.GetCompileName(Options))
-          ));
+          ), this);
         }
       } else if (member is SpecialField arraySpecial && arraySpecial.SpecialId == SpecialField.ID.ArrayLength) {
         obj(EmitCoercionIfNecessary(
             objType,
             objType.IsNonNullRefType || !objType.IsRefType ? null : UserDefinedType.CreateNonNullType((UserDefinedType)objType.NormalizeExpand()),
-          null, new BuilderSyntaxTree<ExprContainer>(objReceiver)
+          null, new BuilderSyntaxTree<ExprContainer>(objReceiver, this)
         ));
         var objExpr = objReceiver.Finish();
 
         return new ExprLvalue((DAST.Expression)DAST.Expression.create_ArrayLen(
           objExpr,
           arraySpecial.IdParam != null ? ((int)arraySpecial.IdParam) : 0
-        ), null);
+        ), null, this);
+      } else if (member is SpecialField { SpecialId: SpecialField.ID.Keys }) {
+        obj(new BuilderSyntaxTree<ExprContainer>(objReceiver, this));
+        var objExpr = objReceiver.Finish();
+        return new ExprLvalue((DAST.Expression)DAST.Expression.create_MapKeys(
+          objExpr), null, this);
+      } else if (member is SpecialField { SpecialId: SpecialField.ID.Values }) {
+        obj(new BuilderSyntaxTree<ExprContainer>(objReceiver, this));
+        var objExpr = objReceiver.Finish();
+        return new ExprLvalue((DAST.Expression)DAST.Expression.create_MapValues(
+          objExpr), null, this);
       } else if (member is SpecialField sf && sf.SpecialId != SpecialField.ID.UseIdParam) {
-        obj(new BuilderSyntaxTree<ExprContainer>(objReceiver));
+        obj(new BuilderSyntaxTree<ExprContainer>(objReceiver, this));
         var objExpr = objReceiver.Finish();
 
         GetSpecialFieldInfo(sf.SpecialId, sf.IdParam, objType, out var compiledName, out _, out _);
@@ -1527,18 +1645,18 @@ member.EnclosingClass is DatatypeDecl
         ), (DAST.AssignLhs)DAST.AssignLhs.create_Select(
           objExpr,
           Sequence<Rune>.UnicodeFromString(compiledName)
-        ));
+        ), this);
       } else if (member is SpecialField sf2 && sf2.SpecialId == SpecialField.ID.UseIdParam && sf2.IdParam is string fieldName && fieldName.StartsWith("is_")) {
-        obj(new BuilderSyntaxTree<ExprContainer>(objReceiver));
+        obj(new BuilderSyntaxTree<ExprContainer>(objReceiver, this));
         var objExpr = objReceiver.Finish();
 
         return new ExprLvalue((DAST.Expression)DAST.Expression.create_TypeTest(
           objExpr,
           PathFromTopLevel(objType.AsTopLevelTypeWithMembers),
           Sequence<Rune>.UnicodeFromString(fieldName.Substring(3))
-        ), null);
+        ), null, this);
       } else {
-        obj(new BuilderSyntaxTree<ExprContainer>(objReceiver));
+        obj(new BuilderSyntaxTree<ExprContainer>(objReceiver, this));
         var objExpr = objReceiver.Finish();
 
         if (expectedType.IsArrowType) {
@@ -1548,7 +1666,7 @@ member.EnclosingClass is DatatypeDecl
             member.EnclosingClass is DatatypeDecl,
             member.IsStatic,
             expectedType.AsArrowType.Arity
-          ), null);
+          ), null, this);
         } else if (internalAccess && (member is ConstantField || member.EnclosingClass is TraitDecl)) {
           return new ExprLvalue((DAST.Expression)DAST.Expression.create_Select(
             objExpr,
@@ -1558,7 +1676,7 @@ member.EnclosingClass is DatatypeDecl
           ), (DAST.AssignLhs)DAST.AssignLhs.create_Select(
             objExpr,
             Sequence<Rune>.UnicodeFromString("_" + member.GetCompileName(Options))
-          ));
+          ), this);
         } else {
           return new ExprLvalue((DAST.Expression)DAST.Expression.create_Select(
             objExpr,
@@ -1568,21 +1686,21 @@ member.EnclosingClass is DatatypeDecl
           ), (DAST.AssignLhs)DAST.AssignLhs.create_Select(
             objExpr,
             Sequence<Rune>.UnicodeFromString(member.GetCompileName(Options))
-          ));
+          ), this);
         }
       }
     }
 
     protected override ConcreteSyntaxTree EmitArraySelect(List<Action<ConcreteSyntaxTree>> indices, Type elmtType, ConcreteSyntaxTree wr) {
-      if (wr is BuilderSyntaxTree<ExprContainer> builder) {
+      if (GetExprBuilder(wr, out var builder)) {
         var indicesAST = indices.Select(i => {
           var buf = new ExprBuffer(null);
-          var localWriter = new BuilderSyntaxTree<ExprContainer>(buf);
+          var localWriter = new BuilderSyntaxTree<ExprContainer>(buf, this);
           i(localWriter);
           return buf.Finish();
         }).ToList();
 
-        return new BuilderSyntaxTree<ExprContainer>(builder.Builder.Index(indicesAST, DAST.CollKind.create_Array()));
+        return new BuilderSyntaxTree<ExprContainer>(builder.Builder.Index(indicesAST, DAST.CollKind.create_Array()), this);
       } else {
         throw new InvalidOperationException();
       }
@@ -1590,32 +1708,28 @@ protected override ConcreteSyntaxTree EmitArraySelect(List<Action<ConcreteSyntax
 
     protected override ConcreteSyntaxTree EmitArraySelect(List<Expression> indices, Type elmtType, bool inLetExprBody,
         ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
-      if (wr is BuilderSyntaxTree<ExprContainer> builder) {
-        var indicesAST = indices.Select(i => {
-          var buf = new ExprBuffer(null);
-          var localWriter = new BuilderSyntaxTree<ExprContainer>(buf);
-          EmitExpr(i, inLetExprBody, localWriter, wStmts);
-          return buf.Finish();
-        }).ToList();
+      if (GetExprConverter(wr, wStmts, out var builder, out var convert)) {
+        var indicesAST = indices.Select(convert).ToList();
 
-        return new BuilderSyntaxTree<ExprContainer>(builder.Builder.Index(indicesAST, DAST.CollKind.create_Array()));
+        return new BuilderSyntaxTree<ExprContainer>(builder.Builder.Index(
+          indicesAST, DAST.CollKind.create_Array()), this);
       } else {
         throw new InvalidOperationException();
       }
     }
 
     protected override (ConcreteSyntaxTree wArray, ConcreteSyntaxTree wRhs) EmitArrayUpdate(List<Action<ConcreteSyntaxTree>> indices, Type elmtType, ConcreteSyntaxTree wr) {
-      if (wr is BuilderSyntaxTree<StatementContainer> builder) {
+      if (GetStatementBuilder(wr, out var builder)) {
         var indicesAST = indices.Select(i => {
           var buf = new ExprBuffer(null);
-          var localWriter = new BuilderSyntaxTree<ExprContainer>(buf);
+          var localWriter = new BuilderSyntaxTree<ExprContainer>(buf, this);
           i(localWriter);
           return buf.Finish();
         }).ToList();
 
         var assign = builder.Builder.Assign();
 
-        return (new BuilderSyntaxTree<ExprContainer>(((LhsContainer)assign).Array(indicesAST)), new BuilderSyntaxTree<ExprContainer>(assign));
+        return (new BuilderSyntaxTree<ExprContainer>(((LhsContainer)assign).Array(indicesAST), this), new BuilderSyntaxTree<ExprContainer>(assign, this));
       } else {
         throw new InvalidOperationException();
       }
@@ -1629,10 +1743,10 @@ protected override void EmitExprAsNativeInt(Expression expr, bool inLetExprBody,
     protected override void EmitIndexCollectionSelect(Expression source, Expression index, bool inLetExprBody,
       ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
       var sourceBuf = new ExprBuffer(null);
-      EmitExpr(source, inLetExprBody, new BuilderSyntaxTree<ExprContainer>(sourceBuf), wStmts);
+      EmitExpr(source, inLetExprBody, new BuilderSyntaxTree<ExprContainer>(sourceBuf, this), wStmts);
 
       var indexBuf = new ExprBuffer(null);
-      EmitExpr(index, inLetExprBody, new BuilderSyntaxTree<ExprContainer>(indexBuf), wStmts);
+      EmitExpr(index, inLetExprBody, new BuilderSyntaxTree<ExprContainer>(indexBuf, this), wStmts);
 
       DAST._ICollKind collKind;
       if (source.Type.IsArrayType) {
@@ -1643,7 +1757,7 @@ protected override void EmitIndexCollectionSelect(Expression source, Expression
         collKind = DAST.CollKind.create_Seq();
       }
 
-      if (wr is BuilderSyntaxTree<ExprContainer> builder) {
+      if (GetExprBuilder(wr, out var builder)) {
         builder.Builder.AddExpr((DAST.Expression)DAST.Expression.create_Index(
           sourceBuf.Finish(),
           collKind,
@@ -1654,9 +1768,56 @@ protected override void EmitIndexCollectionSelect(Expression source, Expression
       }
     }
 
+    protected static bool GetStatementBuilder(ConcreteSyntaxTree wStmts,
+      out BuilderSyntaxTree<StatementContainer> statementBuilder) {
+      if (wStmts is BuilderSyntaxTree<StatementContainer> s) {
+        statementBuilder = s;
+        return true;
+      }
+      statementBuilder = null;
+      return false;
+    }
+
+    protected static bool GetExprBuilder(ConcreteSyntaxTree wr,
+      out BuilderSyntaxTree<ExprContainer> builder) {
+      if (wr is BuilderSyntaxTree<ExprContainer> exprBuilder) {
+        builder = exprBuilder;
+        return true;
+      }
+      builder = null;
+      return false;
+    }
+
+    protected bool GetExprConverter(ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts,
+      out BuilderSyntaxTree<ExprContainer> builder,
+      out Func<Expression, DAST.Expression> converter) {
+      if (wr is BuilderSyntaxTree<ExprContainer> b) {
+        converter = (Expression expr) => ConvertExpression(expr, wStmts);
+        builder = b;
+        return true;
+      }
+      converter = null;
+      builder = null;
+      return false;
+    }
+
     protected override void EmitIndexCollectionUpdate(Expression source, Expression index, Expression value,
       CollectionType resultCollectionType, bool inLetExprBody, ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
-      ThrowGeneralUnsupported();
+      if (GetExprConverter(wr, wStmts, out var builder, out var convert)) {
+        if (resultCollectionType.AsSeqType is { }) {
+          builder.Builder.AddExpr((DAST.Expression)DAST.Expression.create_SeqUpdate(
+            convert(source), convert(index), convert(value)
+          ));
+        } else if (resultCollectionType.AsMapType is { }) {
+          builder.Builder.AddExpr((DAST.Expression)DAST.Expression.create_MapUpdate(
+            convert(source), convert(index), convert(value)
+          ));
+        } else {
+          AddUnsupported("<i>EmitIndexCollectionUpdate for " + resultCollectionType.ToString() + "</i>");
+        }
+      } else {
+        throw new InvalidOperationException();
+      }
     }
 
     protected override void EmitSeqSelectRange(Expression source, Expression lo, Expression hi, bool fromArray,
@@ -1668,7 +1829,7 @@ protected override void EmitSeqSelectRange(Expression source, Expression lo, Exp
         EmitCoercionIfNecessary(
           source.Type,
           source.Type.IsNonNullRefType || !source.Type.IsRefType ? null : UserDefinedType.CreateNonNullType((UserDefinedType)source.Type.NormalizeExpand()),
-          null, new BuilderSyntaxTree<ExprContainer>(sourceBuf)
+          null, new BuilderSyntaxTree<ExprContainer>(sourceBuf, this)
         ),
         wStmts
       );
@@ -1677,18 +1838,18 @@ protected override void EmitSeqSelectRange(Expression source, Expression lo, Exp
       DAST.Expression loExpr = null;
       if (lo != null) {
         var loBuf = new ExprBuffer(null);
-        EmitExpr(lo, inLetExprBody, new BuilderSyntaxTree<ExprContainer>(loBuf), wStmts);
+        EmitExpr(lo, inLetExprBody, new BuilderSyntaxTree<ExprContainer>(loBuf, this), wStmts);
         loExpr = loBuf.Finish();
       }
 
       DAST.Expression hiExpr = null;
       if (hi != null) {
         var hiBuf = new ExprBuffer(null);
-        EmitExpr(hi, inLetExprBody, new BuilderSyntaxTree<ExprContainer>(hiBuf), wStmts);
+        EmitExpr(hi, inLetExprBody, new BuilderSyntaxTree<ExprContainer>(hiBuf, this), wStmts);
         hiExpr = hiBuf.Finish();
       }
 
-      if (wr is BuilderSyntaxTree<ExprContainer> builder) {
+      if (GetExprBuilder(wr, out var builder)) {
         builder.Builder.AddExpr((DAST.Expression)DAST.Expression.create_IndexRange(
           sourceExpr,
           fromArray,
@@ -1701,20 +1862,14 @@ protected override void EmitSeqSelectRange(Expression source, Expression lo, Exp
     }
 
     protected override void EmitSeqConstructionExpr(SeqConstructionExpr expr, bool inLetExprBody, ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
-      if (wr is BuilderSyntaxTree<ExprContainer> builder) {
-        var elem = new ExprBuffer(null);
-        EmitExpr(expr.Initializer, inLetExprBody, new BuilderSyntaxTree<ExprContainer>(elem), wStmts);
-
-        var n = new ExprBuffer(null);
+      if (GetExprConverter(wr, wStmts, out var builder, out var convert)) {
         var size = expr.N;
         if (size.Type.AsNewtype is { }) {
           size = new ConversionExpr(expr.N.tok, size, new IntType());
         }
-        EmitExpr(size, inLetExprBody, new BuilderSyntaxTree<ExprContainer>(n), wStmts);
-
         builder.Builder.AddExpr((DAST.Expression)DAST.Expression.create_SeqConstruct(
-          n.Finish(),
-          elem.Finish()
+          convert(size),
+          convert(expr.Initializer)
         ));
       } else {
         throw new InvalidOperationException();
@@ -1723,24 +1878,21 @@ protected override void EmitSeqConstructionExpr(SeqConstructionExpr expr, bool i
 
     protected override void EmitMultiSetFormingExpr(MultiSetFormingExpr expr, bool inLetExprBody, ConcreteSyntaxTree wr,
       ConcreteSyntaxTree wStmts) {
-      throw new UnsupportedFeatureException(expr.tok, Feature.Multisets);
+      if (GetExprConverter(wr, wStmts, out var builder, out var convert)) {
+        builder.Builder.AddExpr((DAST.Expression)DAST.Expression.create_ToMultiset(
+          convert(expr.E)));
+      } else {
+        AddUnsupportedFeature(expr.tok, Feature.Multisets);
+      }
     }
 
     protected override void EmitApplyExpr(Type functionType, IToken tok, Expression function,
         List<Expression> arguments, bool inLetExprBody, ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
-      if (wr is BuilderSyntaxTree<ExprContainer> builder) {
-        var argsAST = new List<DAST.Expression>();
-        foreach (var arg in arguments) {
-          var argReceiver = new ExprBuffer(null);
-          EmitExpr(arg, inLetExprBody, new BuilderSyntaxTree<ExprContainer>(argReceiver), wStmts);
-          argsAST.Add(argReceiver.Finish());
-        }
-
-        var funcReceiver = new ExprBuffer(null);
-        EmitExpr(function, inLetExprBody, new BuilderSyntaxTree<ExprContainer>(funcReceiver), wStmts);
-        var funcAST = funcReceiver.Finish();
-
-        builder.Builder.AddExpr((DAST.Expression)DAST.Expression.create_Apply(funcAST, Sequence<DAST.Expression>.FromArray(argsAST.ToArray())));
+      if (GetExprConverter(wr, wStmts, out var builder, out var convert)) {
+        builder.Builder.AddExpr((DAST.Expression)DAST.Expression.create_Apply(
+          convert(function),
+          Sequence<DAST.Expression>.FromArray(
+            arguments.Select(arg => convert(arg)).ToArray())));
       } else {
         throw new InvalidOperationException();
       }
@@ -1749,25 +1901,18 @@ protected override void EmitApplyExpr(Type functionType, IToken tok, Expression
     protected override ConcreteSyntaxTree EmitBetaRedex(List<string> boundVars, List<Expression> arguments,
       List<Type> boundTypes, Type resultType, IToken resultTok, bool inLetExprBody, ConcreteSyntaxTree wr,
       ref ConcreteSyntaxTree wStmts) {
-      if (wr is BuilderSyntaxTree<ExprContainer> builder) {
-        var argsAST = new List<_System.Tuple2<DAST.Formal, DAST.Expression>>();
-        for (int i = 0; i < arguments.Count; ++i) {
-          var argReceiver = new ExprBuffer(null);
-          EmitExpr(arguments[i], inLetExprBody, new BuilderSyntaxTree<ExprContainer>(argReceiver), wStmts);
-          argsAST.Add((_System.Tuple2<DAST.Formal, DAST.Expression>)_System.Tuple2<DAST.Formal, DAST.Expression>.create(
-            (DAST.Formal)DAST.Formal.create_Formal(
-              Sequence<Rune>.UnicodeFromString(boundVars[i]),
-              GenType(boundTypes[i])
-            ),
-            argReceiver.Finish()
-          ));
-        }
+      if (GetExprConverter(wr, wStmts, out var builder, out var convert)) {
+        var argsAST = arguments.Select((t, i) =>
+          (_System.Tuple2<DAST.Formal, DAST.Expression>)
+          _System.Tuple2<DAST.Formal, DAST.Expression>.create(
+            (DAST.Formal)DAST.Formal.create_Formal(Sequence<Rune>.UnicodeFromString(boundVars[i]),
+              GenType(boundTypes[i])), convert(t))).ToList();
 
         var retType = GenType(resultType);
 
         return new BuilderSyntaxTree<ExprContainer>(builder.Builder.BetaRedex(
           argsAST, retType
-        ));
+        ), this);
       } else {
         throw new InvalidOperationException();
       }
@@ -1775,14 +1920,14 @@ protected override ConcreteSyntaxTree EmitBetaRedex(List<string> boundVars, List
 
     protected override void EmitDestructor(Action<ConcreteSyntaxTree> source, Formal dtor, int formalNonGhostIndex, DatatypeCtor ctor,
         List<Type> typeArgs, Type bvType, ConcreteSyntaxTree wr) {
-      if (wr is BuilderSyntaxTree<ExprContainer> builder) {
+      if (GetExprBuilder(wr, out var builder)) {
         if (DatatypeWrapperEraser.IsErasableDatatypeWrapper(Options, ctor.EnclosingDatatype, out var coreDtor)) {
           Contract.Assert(coreDtor.CorrespondingFormals.Count == 1);
           Contract.Assert(dtor == coreDtor.CorrespondingFormals[0]); // any other destructor is a ghost
           source(wr);
         } else {
           var buf = new ExprBuffer(null);
-          source(new BuilderSyntaxTree<ExprContainer>(buf));
+          source(new BuilderSyntaxTree<ExprContainer>(buf, this));
           var sourceAST = buf.Finish();
           if (ctor.EnclosingDatatype is TupleTypeDecl) {
             builder.Builder.AddExpr((DAST.Expression)DAST.Expression.create_TupleSelect(
@@ -1803,7 +1948,7 @@ protected override void EmitDestructor(Action<ConcreteSyntaxTree> source, Formal
 
     protected override ConcreteSyntaxTree CreateLambda(List<Type> inTypes, IToken tok, List<string> inNames,
         Type resultType, ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts, bool untyped = false) {
-      if (wr is BuilderSyntaxTree<ExprContainer> builder) {
+      if (GetExprBuilder(wr, out var builder)) {
         var formals = new List<DAST.Formal>();
         for (int i = 0; i < inTypes.Count; ++i) {
           formals.Add((DAST.Formal)DAST.Formal.create_Formal(
@@ -1814,37 +1959,37 @@ protected override ConcreteSyntaxTree CreateLambda(List<Type> inTypes, IToken to
 
         var retType = GenType(resultType);
 
-        return new BuilderSyntaxTree<StatementContainer>(builder.Builder.Lambda(formals, retType));
+        return new BuilderSyntaxTree<StatementContainer>(builder.Builder.Lambda(formals, retType), this);
       } else {
         throw new InvalidOperationException();
       }
     }
 
     protected override void EmitLambdaApply(ConcreteSyntaxTree wr, out ConcreteSyntaxTree wLambda, out ConcreteSyntaxTree wArg) {
-      if (wr is BuilderSyntaxTree<ExprContainer> exprBuilder) {
+      if (GetExprBuilder(wr, out var exprBuilder)) {
         var lambda = exprBuilder.Builder.Apply();
-        wLambda = new BuilderSyntaxTree<ExprContainer>(lambda);
-        wArg = new BuilderSyntaxTree<ExprContainer>(lambda);
+        wLambda = new BuilderSyntaxTree<ExprContainer>(lambda, this);
+        wArg = new BuilderSyntaxTree<ExprContainer>(lambda, this);
       } else {
         throw new InvalidOperationException();
       }
     }
 
     protected override ConcreteSyntaxTree EmitAnd(Action<ConcreteSyntaxTree> lhs, ConcreteSyntaxTree wr) {
-      if (wr is BuilderSyntaxTree<ExprContainer> builder) {
+      if (GetExprBuilder(wr, out var builder)) {
         var binOp = builder.Builder.BinOp((DAST.BinOp)DAST.BinOp.create_Passthrough(
           Sequence<Rune>.UnicodeFromString("&&")
         ));
-        lhs(new BuilderSyntaxTree<ExprContainer>(binOp));
+        lhs(new BuilderSyntaxTree<ExprContainer>(binOp, this));
 
-        return new BuilderSyntaxTree<ExprContainer>(binOp);
+        return new BuilderSyntaxTree<ExprContainer>(binOp, this);
       } else {
         throw new InvalidOperationException();
       }
     }
 
     protected override void EmitBoolBoundedPool(bool inLetExprBody, ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
-      if (wr is BuilderSyntaxTree<ExprContainer> exprBuilder) {
+      if (GetExprBuilder(wr, out var exprBuilder)) {
         exprBuilder.Builder.AddExpr((DAST.Expression)DAST.Expression.create_BoolBoundedPool());
       } else {
         throw new InvalidOperationException();
@@ -1852,20 +1997,17 @@ protected override void EmitBoolBoundedPool(bool inLetExprBody, ConcreteSyntaxTr
     }
 
     protected override void EmitCharBoundedPool(bool inLetExprBody, ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
-      ThrowGeneralUnsupported();
+      AddUnsupported("<i>EmitCharBoundedPool</i>");
     }
 
     protected override void EmitWiggleWaggleBoundedPool(bool inLetExprBody, ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
-      ThrowGeneralUnsupported();
+      AddUnsupported("<i>EmitWiggleWaggleBoundedPool</i>");
     }
 
     protected override void EmitSetBoundedPool(Expression of, string propertySuffix, bool inLetExprBody, ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
-      if (wr is BuilderSyntaxTree<ExprContainer> exprBuilder) {
-        var buf = new ExprBuffer(null);
-        EmitExpr(of, inLetExprBody, new BuilderSyntaxTree<ExprContainer>(buf), wStmts);
-
+      if (GetExprConverter(wr, wStmts, out var exprBuilder, out var convert)) {
         exprBuilder.Builder.AddExpr((DAST.Expression)DAST.Expression.create_SetBoundedPool(
-          buf.Finish()
+          convert(of)
         ));
       } else {
         throw new InvalidOperationException();
@@ -1873,24 +2015,21 @@ protected override void EmitSetBoundedPool(Expression of, string propertySuffix,
     }
 
     protected override void EmitMultiSetBoundedPool(Expression of, bool includeDuplicates, string propertySuffix, bool inLetExprBody, ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
-      ThrowGeneralUnsupported();
+      AddUnsupported("<i>EmitMultiSetBoundedPool</i>");
     }
 
     protected override void EmitSubSetBoundedPool(Expression of, string propertySuffix, bool inLetExprBody, ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
-      ThrowGeneralUnsupported();
+      AddUnsupported("<i>EmitSubSetBoundedPool</i>");
     }
 
     protected override void EmitMapBoundedPool(Expression map, string propertySuffix, bool inLetExprBody, ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
-      ThrowGeneralUnsupported();
+      AddUnsupported("<i>EmitMapBoundedPool</i>");
     }
 
     protected override void EmitSeqBoundedPool(Expression of, bool includeDuplicates, string propertySuffix, bool inLetExprBody, ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
-      if (wr is BuilderSyntaxTree<ExprContainer> exprBuilder) {
-        var buf = new ExprBuffer(null);
-        EmitExpr(of, inLetExprBody, new BuilderSyntaxTree<ExprContainer>(buf), wStmts);
-
+      if (GetExprConverter(wr, wStmts, out var exprBuilder, out var convert)) {
         exprBuilder.Builder.AddExpr((DAST.Expression)DAST.Expression.create_SeqBoundedPool(
-          buf.Finish(),
+          convert(of),
           includeDuplicates
         ));
       } else {
@@ -1899,15 +2038,15 @@ protected override void EmitSeqBoundedPool(Expression of, bool includeDuplicates
     }
 
     protected override void EmitDatatypeBoundedPool(IVariable bv, string propertySuffix, bool inLetExprBody, ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
-      ThrowGeneralUnsupported();
+      AddUnsupported("<i>EmitDatatypeBoundedPool</i>");
     }
 
     protected override void CreateIIFE(string bvName, Type bvType, IToken bvTok, Type bodyType, IToken bodyTok,
       ConcreteSyntaxTree wr, ref ConcreteSyntaxTree wStmts, out ConcreteSyntaxTree wrRhs, out ConcreteSyntaxTree wrBody) {
-      if (wr is BuilderSyntaxTree<ExprContainer> builder) {
+      if (GetExprBuilder(wr, out var builder)) {
         var iife = builder.Builder.IIFE(bvName, GenType(bvType));
-        wrRhs = new BuilderSyntaxTree<ExprContainer>(iife.RhsBuilder());
-        wrBody = new BuilderSyntaxTree<ExprContainer>(iife);
+        wrRhs = new BuilderSyntaxTree<ExprContainer>(iife.RhsBuilder(), this);
+        wrBody = new BuilderSyntaxTree<ExprContainer>(iife, this);
       } else {
         throw new InvalidOperationException("Invalid context for IIFE: " + wr.GetType());
       }
@@ -1930,38 +2069,54 @@ protected override ConcreteSyntaxTree CreateIIFE1(int source, Type resultType, I
     }
 
     protected override void EmitUnaryExpr(ResolvedUnaryOp op, Expression expr, bool inLetExprBody, ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
-      if (wr is BuilderSyntaxTree<ExprContainer> container) {
-        var buf = new ExprBuffer(null);
-        EmitExpr(expr, inLetExprBody, new BuilderSyntaxTree<ExprContainer>(buf), wStmts);
-
+      if (GetExprConverter(wr, wStmts, out var container, out var convert)) {
         switch (op) {
           case ResolvedUnaryOp.BoolNot: {
               container.Builder.AddExpr((DAST.Expression)DAST.Expression.create_UnOp(
                 UnaryOp.create_Not(),
-                buf.Finish()
+                convert(expr),
+                new UnaryOpFormat_NoFormat()
               ));
               break;
             }
           case ResolvedUnaryOp.BitwiseNot: {
               container.Builder.AddExpr((DAST.Expression)DAST.Expression.create_UnOp(
                 UnaryOp.create_BitwiseNot(),
-                buf.Finish()
+                convert(expr),
+                new UnaryOpFormat_NoFormat()
               ));
               break;
             }
           case ResolvedUnaryOp.Cardinality: {
               container.Builder.AddExpr((DAST.Expression)DAST.Expression.create_UnOp(
                 UnaryOp.create_Cardinality(),
-                buf.Finish()
+                convert(expr),
+                new UnaryOpFormat_NoFormat()
               ));
               break;
             }
         }
       } else {
-        throw new InvalidOperationException();
+        AddUnsupported("<i>UnaryExpr " + op + "</i>");
       }
     }
 
+    // A few helpers to reduce the size of expressions
+    private static DAST.Expression Not(_IExpression expr, bool mergeInner = true) {
+      return (DAST.Expression)DAST.Expression.create_UnOp(
+        new UnaryOp_Not(),
+        (DAST.Expression)expr,
+        mergeInner ? new UnaryOpFormat_CombineFormat() : new UnaryOpFormat_NoFormat());
+    }
+
+    private static DAST.Expression BinaryOp(_IBinOp op, _IExpression left, _IExpression right, _IBinaryOpFormat format = null) {
+      format ??= new BinaryOpFormat_NoFormat();
+
+      return (DAST.Expression)DAST.Expression.create_BinOp(
+        op, left, right, format
+      );
+    }
+
     protected override void CompileBinOp(BinaryExpr.ResolvedOpcode op,
       Expression e0, Expression e1, IToken tok, Type resultType,
       out string opString,
@@ -2034,30 +2189,165 @@ protected override void CompileBinOp(BinaryExpr.ResolvedOpcode op,
           _ => null
         };
 
-        var opAst = op switch {
-          BinaryExpr.ResolvedOpcode.EqCommon => DAST.BinOp.create_Eq(
-            e0.Type.IsRefType,
-            !e0.Type.IsNonNullRefType
-          ),
-          BinaryExpr.ResolvedOpcode.NeqCommon => DAST.BinOp.create_Neq(
+        object B(_IBinOp binOp) {
+          return builder.Builder.BinOp((DAST.BinOp)binOp);
+        }
+
+        var opStringClosure = opString;
+        object C(System.Func<DAST.Expression, DAST.Expression, DAST.Expression> callback) {
+          return builder.Builder.BinOp(opStringClosure, callback);
+        }
+
+        var newBuilder = op switch {
+          BinaryExpr.ResolvedOpcode.EqCommon => B((BinOp)BinOp.create_Eq(
             e0.Type.IsRefType,
             !e0.Type.IsNonNullRefType
-          ),
-          BinaryExpr.ResolvedOpcode.Div => NeedsEuclideanDivision(resultType) ? DAST.BinOp.create_EuclidianDiv() : DAST.BinOp.create_Div(),
-          BinaryExpr.ResolvedOpcode.Mod => NeedsEuclideanDivision(resultType) ? DAST.BinOp.create_EuclidianMod() : DAST.BinOp.create_Mod(),
-          BinaryExpr.ResolvedOpcode.Imp => DAST.BinOp.create_Implies(),
-          BinaryExpr.ResolvedOpcode.InSet => DAST.BinOp.create_In(),
-          BinaryExpr.ResolvedOpcode.InSeq => DAST.BinOp.create_In(),
-          BinaryExpr.ResolvedOpcode.NotInSet => DAST.BinOp.create_NotIn(),
-          BinaryExpr.ResolvedOpcode.NotInSeq => DAST.BinOp.create_NotIn(),
-          BinaryExpr.ResolvedOpcode.SetDifference => DAST.BinOp.create_SetDifference(),
-          BinaryExpr.ResolvedOpcode.Concat => DAST.BinOp.create_Concat(),
-          _ => DAST.BinOp.create_Passthrough(Sequence<Rune>.UnicodeFromString(opString)),
+          )),
+          BinaryExpr.ResolvedOpcode.SetEq => B((BinOp)BinOp.create_Eq(false, false)),
+          BinaryExpr.ResolvedOpcode.MapEq => B((BinOp)BinOp.create_Eq(false, false)),
+          BinaryExpr.ResolvedOpcode.SeqEq => B((BinOp)BinOp.create_Eq(false, false)),
+          BinaryExpr.ResolvedOpcode.MultiSetEq => B((BinOp)BinOp.create_Eq(false, false)),
+          BinaryExpr.ResolvedOpcode.NeqCommon => C((left, right) =>
+            Not(BinaryOp(
+              BinOp.create_Eq(
+                e0.Type.IsRefType,
+                !e0.Type.IsNonNullRefType
+              ), left, right))),
+          BinaryExpr.ResolvedOpcode.SetNeq => C((left, right) =>
+            Not(BinaryOp(BinOp.create_Eq(false, false), left, right))),
+          BinaryExpr.ResolvedOpcode.SeqNeq => C((left, right) =>
+            Not(BinaryOp(BinOp.create_Eq(false, false), left, right))),
+          BinaryExpr.ResolvedOpcode.MultiSetNeq => C((left, right) =>
+            Not(BinaryOp(BinOp.create_Eq(false, false), left, right))),
+
+          BinaryExpr.ResolvedOpcode.Div =>
+            B(NeedsEuclideanDivision(resultType) ? BinOp.create_EuclidianDiv() : BinOp.create_Div()),
+          BinaryExpr.ResolvedOpcode.Mod =>
+            B(NeedsEuclideanDivision(resultType) ? BinOp.create_EuclidianMod() : BinOp.create_Mod()),
+          BinaryExpr.ResolvedOpcode.Imp =>
+            C((left, right) =>
+              BinaryOp(
+                DAST.BinOp.create_Or(),
+                Not(left, false), right, new BinaryOpFormat_ImpliesFormat()
+              )),
+          BinaryExpr.ResolvedOpcode.Iff =>
+            C((left, right) =>
+              BinaryOp(
+                BinOp.create_Eq(false, false),
+                left, right, new BinaryOpFormat_EquivalenceFormat()
+              )),
+          BinaryExpr.ResolvedOpcode.InSet => B(DAST.BinOp.create_In()), // TODO: Differentiate?
+          BinaryExpr.ResolvedOpcode.InSeq => B(DAST.BinOp.create_In()),
+          BinaryExpr.ResolvedOpcode.InMap => B(DAST.BinOp.create_In()),
+          BinaryExpr.ResolvedOpcode.InMultiSet => B(DAST.BinOp.create_In()),
+
+
+          BinaryExpr.ResolvedOpcode.Union =>
+            B(DAST.BinOp.create_SetMerge()),
+          BinaryExpr.ResolvedOpcode.SetDifference =>
+            B(DAST.BinOp.create_SetSubtraction()),
+          BinaryExpr.ResolvedOpcode.Intersection =>
+            B(DAST.BinOp.create_SetIntersection()),
+          BinaryExpr.ResolvedOpcode.Disjoint =>
+            B(DAST.BinOp.create_SetDisjoint()),
+          BinaryExpr.ResolvedOpcode.ProperSubset =>
+            B(DAST.BinOp.create_ProperSubset()),
+          BinaryExpr.ResolvedOpcode.Subset =>
+            B(DAST.BinOp.create_Subset()),
+          BinaryExpr.ResolvedOpcode.Superset =>
+            C((left, right) =>
+              BinaryOp(new BinOp_Subset(), right, left,
+                new BinaryOpFormat_ReverseFormat())),
+          BinaryExpr.ResolvedOpcode.ProperSuperset =>
+            C((left, right) =>
+              BinaryOp(new BinOp_ProperSubset(), right, left,
+                new BinaryOpFormat_ReverseFormat())),
+
+          BinaryExpr.ResolvedOpcode.MultiSetUnion =>
+            B(DAST.BinOp.create_MultisetMerge()),
+          BinaryExpr.ResolvedOpcode.MultiSetDifference =>
+            B(DAST.BinOp.create_MultisetSubtraction()),
+          BinaryExpr.ResolvedOpcode.MultiSetIntersection =>
+            B(DAST.BinOp.create_MultisetIntersection()),
+          BinaryExpr.ResolvedOpcode.MultiSetDisjoint =>
+            B(DAST.BinOp.create_MultisetDisjoint()),
+          BinaryExpr.ResolvedOpcode.ProperMultiSubset =>
+            B(DAST.BinOp.create_ProperSubmultiset()),
+          BinaryExpr.ResolvedOpcode.MultiSubset =>
+            B(DAST.BinOp.create_Submultiset()),
+          BinaryExpr.ResolvedOpcode.MultiSuperset =>
+            C((left, right) =>
+              BinaryOp(new BinOp_Submultiset(), right, left,
+                new BinaryOpFormat_ReverseFormat())),
+          BinaryExpr.ResolvedOpcode.ProperMultiSuperset =>
+            C((left, right) =>
+              BinaryOp(new BinOp_ProperSubmultiset(), right, left,
+                new BinaryOpFormat_ReverseFormat())),
+
+          BinaryExpr.ResolvedOpcode.MapMerge =>
+            B(DAST.BinOp.create_MapMerge()),
+          BinaryExpr.ResolvedOpcode.MapSubtraction =>
+            B(DAST.BinOp.create_MapSubtraction()),
+
+          BinaryExpr.ResolvedOpcode.ProperPrefix =>
+            B(DAST.BinOp.create_SeqProperPrefix()),
+          BinaryExpr.ResolvedOpcode.Prefix =>
+            B(DAST.BinOp.create_SeqPrefix()),
+
+          BinaryExpr.ResolvedOpcode.NotInMap =>
+            C((left, right) =>
+              Not(BinaryOp(new BinOp_In(), left, right))),
+          BinaryExpr.ResolvedOpcode.NotInSet =>
+            C((left, right) =>
+              Not(BinaryOp(new BinOp_In(), left, right))),
+          BinaryExpr.ResolvedOpcode.NotInSeq =>
+            C((left, right) =>
+              Not(BinaryOp(new BinOp_In(), left, right))),
+          BinaryExpr.ResolvedOpcode.NotInMultiSet =>
+            C((left, right) =>
+              Not(BinaryOp(new BinOp_In(), left, right))),
+          BinaryExpr.ResolvedOpcode.Concat => B(BinOp.create_Concat()),
+          BinaryExpr.ResolvedOpcode.And => B(BinOp.create_And()),
+          BinaryExpr.ResolvedOpcode.Or => B(BinOp.create_Or()),
+          BinaryExpr.ResolvedOpcode.Add => B(BinOp.create_Plus()),
+          BinaryExpr.ResolvedOpcode.Sub => B(BinOp.create_Minus()),
+          BinaryExpr.ResolvedOpcode.Mul => B(BinOp.create_Times()),
+          BinaryExpr.ResolvedOpcode.BitwiseAnd => B(BinOp.create_BitwiseAnd()),
+          BinaryExpr.ResolvedOpcode.BitwiseOr => B(BinOp.create_BitwiseOr()),
+          BinaryExpr.ResolvedOpcode.BitwiseXor => B(BinOp.create_BitwiseXor()),
+          BinaryExpr.ResolvedOpcode.LeftShift => B(BinOp.create_BitwiseShiftLeft()),
+          BinaryExpr.ResolvedOpcode.RightShift => B(BinOp.create_BitwiseShiftRight()),
+          BinaryExpr.ResolvedOpcode.Lt =>
+            B(BinOp.create_Lt()),
+          BinaryExpr.ResolvedOpcode.LtChar =>
+            B(BinOp.create_LtChar()),
+          BinaryExpr.ResolvedOpcode.Le =>
+            C((left, right) =>
+              Not(BinaryOp(new BinOp_Lt(), right, left,
+                new BinaryOpFormat_ReverseFormat()))),
+          BinaryExpr.ResolvedOpcode.LeChar =>
+            C((left, right) =>
+              Not(BinaryOp(new BinOp_LtChar(), right, left,
+                new BinaryOpFormat_ReverseFormat()))),
+          BinaryExpr.ResolvedOpcode.Gt =>
+            C((left, right) =>
+              BinaryOp(new BinOp_Lt(), right, left, new BinaryOpFormat_ReverseFormat())),
+          BinaryExpr.ResolvedOpcode.GtChar =>
+            C((left, right) =>
+              BinaryOp(new BinOp_LtChar(), right, left, new BinaryOpFormat_ReverseFormat())),
+          BinaryExpr.ResolvedOpcode.Ge =>
+            C((left, right) =>
+              Not(BinaryOp(new BinOp_Lt(), left, right))),
+          BinaryExpr.ResolvedOpcode.GeChar =>
+            C((left, right) =>
+              Not(BinaryOp(new BinOp_LtChar(), left, right))),
+
+          _ => B(DAST.BinOp.create_Passthrough(Sequence<Rune>.UnicodeFromString($"<b>Unsupported: <i>Operator {op}</i></b>"))),
         };
 
         opString = "";
 
-        currentBuilder = builder.Builder.BinOp((DAST.BinOp)opAst);
+        currentBuilder = newBuilder;
         // cleaned up by EmitExpr
       } else {
         throw new InvalidOperationException();
@@ -2065,17 +2355,11 @@ protected override void CompileBinOp(BinaryExpr.ResolvedOpcode op,
     }
 
     protected override void EmitITE(Expression guard, Expression thn, Expression els, Type resultType, bool inLetExprBody, ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
-      if (wr is BuilderSyntaxTree<ExprContainer> builder) {
-        var guardBuffer = new ExprBuffer(null);
-        var thnBuffer = new ExprBuffer(null);
-        var elsBuffer = new ExprBuffer(null);
-        EmitExpr(guard, false, new BuilderSyntaxTree<ExprContainer>(guardBuffer), wStmts);
-        EmitExpr(thn, false, new BuilderSyntaxTree<ExprContainer>(thnBuffer), wStmts);
-        EmitExpr(els, false, new BuilderSyntaxTree<ExprContainer>(elsBuffer), wStmts);
+      if (GetExprConverter(wr, wStmts, out var builder, out var convert)) {
         builder.Builder.AddExpr((DAST.Expression)DAST.Expression.create_Ite(
-          guardBuffer.Finish(),
-          thnBuffer.Finish(),
-          elsBuffer.Finish()
+          convert(guard),
+          convert(thn),
+          convert(els)
         ));
       } else {
         throw new InvalidOperationException();
@@ -2083,18 +2367,18 @@ protected override void EmitITE(Expression guard, Expression thn, Expression els
     }
 
     protected override void EmitIsZero(string varName, ConcreteSyntaxTree wr) {
-      ThrowGeneralUnsupported();
+      AddUnsupported("<i>EmitIsZero</i>");
     }
 
     protected override void EmitConversionExpr(Expression fromExpr, Type fromType, Type toType, bool inLetExprBody, ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
-      if (wr is BuilderSyntaxTree<ExprContainer> builder) {
+      if (GetExprBuilder(wr, out var builder)) {
         if (toType.Equals(fromType)) {
           EmitExpr(fromExpr, inLetExprBody, builder, wStmts);
         } else {
           EmitExpr(fromExpr, inLetExprBody, new BuilderSyntaxTree<ExprContainer>(builder.Builder.Convert(
             GenType(fromType),
             GenType(toType)
-          )), wStmts);
+          ), this), wStmts);
         }
       } else {
         throw new InvalidOperationException();
@@ -2102,7 +2386,7 @@ protected override void EmitConversionExpr(Expression fromExpr, Type fromType, T
     }
 
     protected override void EmitConstructorCheck(string source, DatatypeCtor ctor, ConcreteSyntaxTree wr) {
-      if (wr is BuilderSyntaxTree<ExprContainer> builder) {
+      if (GetExprBuilder(wr, out var builder)) {
         builder.Builder.AddExpr((DAST.Expression)DAST.Expression.create_TypeTest(
           DAST.Expression.create_Ident(Sequence<Rune>.UnicodeFromString(source)),
           PathFromTopLevel(ctor.EnclosingDatatype),
@@ -2114,7 +2398,7 @@ protected override void EmitConstructorCheck(string source, DatatypeCtor ctor, C
     }
 
     protected override void EmitTypeTest(string localName, Type fromType, Type toType, IToken tok, ConcreteSyntaxTree wr) {
-      throw new UnsupportedFeatureException(tok, Feature.TypeTests);
+      AddUnsupportedFeature(tok, Feature.TypeTests);
     }
 
     protected override void EmitIsIntegerTest(Expression source, ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
@@ -2131,45 +2415,38 @@ protected override void EmitIsInIntegerRange(Expression source, BigInteger lo, B
 
     protected override void EmitCollectionDisplay(CollectionType ct, IToken tok, List<Expression> elements,
       bool inLetExprBody, ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
-      if (wr is BuilderSyntaxTree<ExprContainer> builder) {
-        var elementsAST = new List<DAST.Expression>();
-        foreach (var e in elements) {
-          var buffer = new ExprBuffer(null);
-          EmitExpr(e, false, new BuilderSyntaxTree<ExprContainer>(buffer), wStmts);
-          elementsAST.Add(buffer.Finish());
-        }
+      if (GetExprConverter(wr, wStmts, out var builder, out var convert)) {
+        var elementsAST = elements.Select(convert).ToArray();
 
         if (ct is SetType set) {
           builder.Builder.AddExpr((DAST.Expression)DAST.Expression.create_SetValue(
-            Sequence<DAST.Expression>.FromArray(elementsAST.ToArray())
+            Sequence<DAST.Expression>.FromArray(elementsAST)
           ));
         } else if (ct is MultiSetType multiSet) {
-          ThrowGeneralUnsupported();
+          builder.Builder.AddExpr((DAST.Expression)DAST.Expression.create_MultisetValue(
+            Sequence<DAST.Expression>.FromArray(elementsAST)
+          ));
         } else if (ct is SeqType seq) {
           builder.Builder.AddExpr((DAST.Expression)DAST.Expression.create_SeqValue(
-            Sequence<DAST.Expression>.FromArray(elementsAST.ToArray()),
+            Sequence<DAST.Expression>.FromArray(elementsAST),
             GenType(ct.TypeArgs[0])
           ));
         } else {
           throw new InvalidOperationException();
         }
       } else {
-        throw new InvalidOperationException();
+        throw new InvalidOperationException();//TODO
       }
     }
 
     protected override void EmitMapDisplay(MapType mt, IToken tok, List<ExpressionPair> elements, bool inLetExprBody,
       ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
-      if (wr is BuilderSyntaxTree<ExprContainer> builder) {
+      if (GetExprConverter(wr, wStmts, out var builder, out var converter)) {
         var elementsAST = new List<_System.Tuple2<DAST.Expression, DAST.Expression>>();
         foreach (var e in elements) {
-          var buffer0 = new ExprBuffer(null);
-          EmitExpr(e.A, false, new BuilderSyntaxTree<ExprContainer>(buffer0), wStmts);
-          var buffer1 = new ExprBuffer(null);
-          EmitExpr(e.B, false, new BuilderSyntaxTree<ExprContainer>(buffer1), wStmts);
           elementsAST.Add((_System.Tuple2<DAST.Expression, DAST.Expression>)_System.Tuple2<DAST.Expression, DAST.Expression>.create(
-            buffer0.Finish(),
-            buffer1.Finish()
+            converter(e.A),
+            converter(e.B)
           ));
         }
 
@@ -2182,25 +2459,93 @@ protected override void EmitMapDisplay(MapType mt, IToken tok, List<ExpressionPa
     }
 
     protected override void EmitSetBuilder_New(ConcreteSyntaxTree wr, SetComprehension e, string collectionName) {
-      ThrowGeneralUnsupported();
-      throw new InvalidOperationException();
+      if (GetStatementBuilder(wr, out var builder)) {
+        var eType = e.Type.AsSetType;
+        if (eType == null) {// dafny0/GeneralNewtypeCollections
+          throw new UnsupportedFeatureException(e.tok, Feature.NonNativeNewtypes);
+        }
+        var elemType = GenType(eType.Arg);
+        var setBuilderType = DAST.Type.create_SetBuilder(elemType);
+        builder.Builder.AddStatement(
+          (DAST.Statement)DAST.Statement.create_DeclareVar(
+            Sequence<Rune>.UnicodeFromString(collectionName),
+            setBuilderType,
+            Option<_IExpression>.create_Some(
+              DAST.Expression.create_SetBuilder(elemType)
+            )
+          ));
+      } else {
+        AddUnsupported("<i>EmitSetBuilder_New</i>");
+      }
     }
 
     protected override void EmitMapBuilder_New(ConcreteSyntaxTree wr, MapComprehension e, string collectionName) {
-      ThrowGeneralUnsupported();
-      throw new InvalidOperationException();
+      if (GetStatementBuilder(wr, out var builder)) {
+        var eType = e.Type.AsMapType;
+        var keyType = GenType(eType.Range);
+        var valueType = GenType(eType.Domain);
+        var mapType = DAST.Type.create_MapBuilder(keyType, valueType);
+        builder.Builder.AddStatement(
+          (DAST.Statement)DAST.Statement.create_DeclareVar(
+            Sequence<Rune>.UnicodeFromString(collectionName),
+            mapType,
+            Option<_IExpression>.create_Some(
+              DAST.Expression.create_MapBuilder(keyType, valueType)
+              )
+            ));
+      } else {
+        AddUnsupported("<i>EmitMapBuilder_New (non-statement)</i>");
+      }
+      //throw new InvalidOperationException();
     }
 
     protected override void EmitSetBuilder_Add(CollectionType ct, string collName, Expression elmt, bool inLetExprBody,
         ConcreteSyntaxTree wr) {
-      ThrowGeneralUnsupported();
-      throw new InvalidOperationException();
+      if (GetStatementBuilder(wr, out var builder)) {
+        var stmtBuilder = new CallStmtBuilder();
+        stmtBuilder.SetName((DAST.CallName)DAST.CallName.create_SetBuilderAdd());
+        stmtBuilder.SetTypeArgs(new List<DAST.Type> { });
+        stmtBuilder.SetOuts(new List<ISequence<Rune>> { }); ;
+        stmtBuilder.AddExpr((DAST.Expression)DAST.Expression.create_Ident(Sequence<Rune>.UnicodeFromString(collName)));
+        stmtBuilder.AddExpr(ConvertExpression(elmt, builder));
+        builder.Builder.AddBuildable(stmtBuilder);
+      } else {
+        AddUnsupported("<i>EmitSetBuilder_Add</i>");
+      }
+      //throw new InvalidOperationException();
+    }
+
+    // Normally wStmt is a BuilderSyntaxTree<StatementContainer> but it might not while the compiler is being developed
+    private DAST.Expression ConvertExpression(Expression term, ConcreteSyntaxTree wStmt) {
+      var buffer0 = new ExprBuffer(null);
+      EmitExpr(term, false, new BuilderSyntaxTree<ExprContainer>(buffer0, this), wStmt);
+      return buffer0.Finish();
+    }
+
+    private BuilderSyntaxTree<ExprContainer> CreateExprBuilder() {
+      var exprBuffer = new ExprBuffer(null);
+      var exprBuilder = new BuilderSyntaxTree<ExprContainer>(exprBuffer, this);
+      return exprBuilder;
     }
 
     protected override ConcreteSyntaxTree EmitMapBuilder_Add(MapType mt, IToken tok, string collName, Expression term,
         bool inLetExprBody, ConcreteSyntaxTree wr) {
-      ThrowGeneralUnsupported();
-      throw new InvalidOperationException();
+      if (GetStatementBuilder(wr, out var builder)) {
+        var stmtBuilder = new CallStmtBuilder();
+        stmtBuilder.SetName((DAST.CallName)DAST.CallName.create_MapBuilderAdd());
+        stmtBuilder.SetTypeArgs(new List<DAST.Type> { });
+        stmtBuilder.SetOuts(new List<ISequence<Rune>> { }); ;
+        stmtBuilder.AddExpr((DAST.Expression)DAST.Expression.create_Ident(Sequence<Rune>.UnicodeFromString(collName)));
+        var keyBuilder = CreateExprBuilder();
+        stmtBuilder.AddBuildable((ExprBuffer)keyBuilder.Builder);
+        stmtBuilder.AddExpr(ConvertExpression(term, builder));
+        builder.Builder.AddBuildable(stmtBuilder);
+        return keyBuilder;
+      } else {
+        AddUnsupported("<i>EMitMapBuilder_Add</i>");
+        var buffer1 = new ExprBuffer(null);
+        return new BuilderSyntaxTree<ExprContainer>(buffer1, this);
+      }
     }
 
     protected override Action<ConcreteSyntaxTree> GetSubtypeCondition(string tmpVarName, Type boundVarType, IToken tok, ConcreteSyntaxTree wPreconditions) {
@@ -2212,21 +2557,22 @@ protected override Action<ConcreteSyntaxTree> GetSubtypeCondition(string tmpVarN
           baseExpr = DAST.Expression.create_Literal(DAST.Literal.create_BoolLiteral(true));
         } else {
           // typeTest = $"{tmpVarName} instanceof {TypeName(boundVarType, wPreconditions, tok)}";
-          ThrowGeneralUnsupported();
+          AddUnsupported("<i>TypeName</i>");
           throw new InvalidOperationException();
         }
 
         if (boundVarType.IsNonNullRefType) {
           typeTest = wr => {
-            if (wr is BuilderSyntaxTree<ExprContainer> builder) {
+            if (GetExprBuilder(wr, out var builder)) {
               builder.Builder.AddExpr((DAST.Expression)DAST.Expression.create_BinOp(
                 DAST.BinOp.create_Passthrough(Sequence<Rune>.UnicodeFromString("&&")),
                 DAST.Expression.create_BinOp(
                   DAST.BinOp.create_Passthrough(Sequence<Rune>.UnicodeFromString("!=")),
                   DAST.Expression.create_Ident(Sequence<Rune>.UnicodeFromString(tmpVarName)),
-                  DAST.Expression.create_Literal(DAST.Literal.create_Null(GenType(boundVarType)))
-                ),
-                baseExpr
+                  DAST.Expression.create_Literal(DAST.Literal.create_Null(GenType(boundVarType))),
+                  new BinaryOpFormat_NoFormat()),
+                baseExpr,
+                new BinaryOpFormat_NoFormat()
               ));
             } else {
               throw new InvalidOperationException();
@@ -2234,15 +2580,17 @@ protected override Action<ConcreteSyntaxTree> GetSubtypeCondition(string tmpVarN
           };
         } else {
           typeTest = wr => {
-            if (wr is BuilderSyntaxTree<ExprContainer> builder) {
+            if (GetExprBuilder(wr, out var builder)) {
               builder.Builder.AddExpr((DAST.Expression)DAST.Expression.create_BinOp(
                 DAST.BinOp.create_Passthrough(Sequence<Rune>.UnicodeFromString("||")),
                 DAST.Expression.create_BinOp(
                   DAST.BinOp.create_Passthrough(Sequence<Rune>.UnicodeFromString("==")),
                   DAST.Expression.create_Ident(Sequence<Rune>.UnicodeFromString(tmpVarName)),
-                  DAST.Expression.create_Literal(DAST.Literal.create_Null(GenType(boundVarType)))
+                  DAST.Expression.create_Literal(DAST.Literal.create_Null(GenType(boundVarType))),
+                  new BinaryOpFormat_NoFormat()
                 ),
-                baseExpr
+                baseExpr,
+                new BinaryOpFormat_NoFormat()
               ));
             } else {
               throw new InvalidOperationException();
@@ -2256,9 +2604,23 @@ protected override Action<ConcreteSyntaxTree> GetSubtypeCondition(string tmpVarN
       return typeTest;
     }
 
-    protected override string GetCollectionBuilder_Build(CollectionType ct, IToken tok, string collName, ConcreteSyntaxTree wr) {
-      ThrowGeneralUnsupported();
-      throw new InvalidOperationException();
+    protected override void GetCollectionBuilder_Build(CollectionType ct, IToken tok, string collName,
+      ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmt) {
+      if (GetExprBuilder(wr, out var builder)) {
+        var callExpr = new CallExprBuilder();
+        if (ct.IsMapType) {
+          callExpr.SetName((DAST.CallName)DAST.CallName.create_MapBuilderBuild());
+        } else {
+          callExpr.SetName((DAST.CallName)DAST.CallName.create_SetBuilderBuild());
+        }
+
+        callExpr.SetTypeArgs(new List<DAST.Type> { });
+        callExpr.SetOuts(new List<ISequence<Rune>> { }); ;
+        callExpr.AddExpr((DAST.Expression)DAST.Expression.create_Ident(Sequence<Rune>.UnicodeFromString(collName)));
+        builder.Builder.AddBuildable(callExpr);
+      } else {
+        AddUnsupported("<i>GetCollectionBuilder_Build</i>");
+      }
     }
 
     protected override (Type, Action<ConcreteSyntaxTree>) EmitIntegerRange(Type type, Action<ConcreteSyntaxTree> wLo, Action<ConcreteSyntaxTree> wHi) {
@@ -2271,11 +2633,11 @@ protected override (Type, Action<ConcreteSyntaxTree>) EmitIntegerRange(Type type
 
       return (result, (wr) => {
         var loBuf = new ExprBuffer(null);
-        wLo(new BuilderSyntaxTree<ExprContainer>(loBuf));
+        wLo(new BuilderSyntaxTree<ExprContainer>(loBuf, this));
         var hiBuf = new ExprBuffer(null);
-        wHi(new BuilderSyntaxTree<ExprContainer>(hiBuf));
+        wHi(new BuilderSyntaxTree<ExprContainer>(hiBuf, this));
 
-        if (wr is BuilderSyntaxTree<ExprContainer> builder) {
+        if (GetExprBuilder(wr, out var builder)) {
           builder.Builder.AddExpr((DAST.Expression)DAST.Expression.create_IntRange(
             loBuf.Finish(),
             hiBuf.Finish()
@@ -2288,16 +2650,16 @@ protected override (Type, Action<ConcreteSyntaxTree>) EmitIntegerRange(Type type
     }
 
     protected override void EmitNull(Type _, ConcreteSyntaxTree wr) {
-      ThrowGeneralUnsupported();
+      AddUnsupported("<i>EmitNull</i>");
     }
 
     protected override void EmitSingleValueGenerator(Expression e, bool inLetExprBody, string type,
       ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
-      throw new UnsupportedFeatureException(Token.NoToken, Feature.ExactBoundedPool);
+      AddUnsupportedFeature(e.Tok, Feature.ExactBoundedPool);
     }
 
     protected override void EmitHaltRecoveryStmt(Statement body, string haltMessageVarName, Statement recoveryBody, ConcreteSyntaxTree wr) {
-      ThrowGeneralUnsupported();
+      AddUnsupported("<i>EmitHaltRecoveryStmt</i>");
     }
 
   }
diff --git a/Source/DafnyCore/Backends/DafnyExecutableBackend.cs b/Source/DafnyCore/Backends/DafnyExecutableBackend.cs
index d35b2877cb2..18c955848cd 100644
--- a/Source/DafnyCore/Backends/DafnyExecutableBackend.cs
+++ b/Source/DafnyCore/Backends/DafnyExecutableBackend.cs
@@ -11,6 +11,9 @@ namespace Microsoft.Dafny.Compilers;
 
 public abstract class DafnyExecutableBackend : ExecutableBackend {
 
+  protected virtual bool PreventShadowing => true;
+  protected virtual bool CanEmitUncompilableCode => true;
+
   protected DafnyWrittenCodeGenerator DafnyCodeGenerator;
 
   protected DafnyExecutableBackend(DafnyOptions options) : base(options) {
@@ -18,7 +21,7 @@ protected DafnyExecutableBackend(DafnyOptions options) : base(options) {
 
   protected override SinglePassCodeGenerator CreateCodeGenerator() {
     // becomes this.compiler
-    return new DafnyCodeGenerator(Options, Reporter);
+    return new DafnyCodeGenerator(Options, Reporter, PreventShadowing, CanEmitUncompilableCode);
   }
 
   protected abstract DafnyWrittenCodeGenerator CreateDafnyWrittenCompiler();
diff --git a/Source/DafnyCore/Backends/GoLang/GoCodeGenerator.cs b/Source/DafnyCore/Backends/GoLang/GoCodeGenerator.cs
index b466954600b..1cd8c7c9d4a 100644
--- a/Source/DafnyCore/Backends/GoLang/GoCodeGenerator.cs
+++ b/Source/DafnyCore/Backends/GoLang/GoCodeGenerator.cs
@@ -3876,12 +3876,13 @@ protected override ConcreteSyntaxTree EmitMapBuilder_Add(MapType mt, IToken tok,
       return termLeftWriter;
     }
 
-    protected override string GetCollectionBuilder_Build(CollectionType ct, IToken tok, string collName, ConcreteSyntaxTree wr) {
+    protected override void GetCollectionBuilder_Build(CollectionType ct, IToken tok, string collName,
+      ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmt) {
       if (ct is SetType) {
-        return collName + ".ToSet()";
+        wr.Write(collName + ".ToSet()");
       } else {
         Contract.Assert(ct is MapType);
-        return collName + ".ToMap()";
+        wr.Write(collName + ".ToMap()");
       }
     }
 
diff --git a/Source/DafnyCore/Backends/Java/JavaCodeGenerator.cs b/Source/DafnyCore/Backends/Java/JavaCodeGenerator.cs
index 9ea6c571bcd..73cdc8d5f1d 100644
--- a/Source/DafnyCore/Backends/Java/JavaCodeGenerator.cs
+++ b/Source/DafnyCore/Backends/Java/JavaCodeGenerator.cs
@@ -3524,15 +3524,16 @@ protected override void EmitSetBuilder_Add(CollectionType ct, string collName, E
       }
     }
 
-    protected override string GetCollectionBuilder_Build(CollectionType ct, IToken tok, string collName, ConcreteSyntaxTree wr) {
+    protected override void GetCollectionBuilder_Build(CollectionType ct, IToken tok, string collName,
+      ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmt) {
       if (ct is SetType) {
         var typeName = BoxedTypeName(ct.Arg, wr, tok);
-        return $"new {DafnySetClass}<{typeName}>({collName})";
+        wr.Write($"new {DafnySetClass}<{typeName}>({collName})");
       } else if (ct is MapType) {
         var mt = (MapType)ct;
         var domtypeName = BoxedTypeName(mt.Domain, wr, tok);
         var rantypeName = BoxedTypeName(mt.Range, wr, tok);
-        return $"new {DafnyMapClass}<{domtypeName},{rantypeName}>({collName})";
+        wr.Write($"new {DafnyMapClass}<{domtypeName},{rantypeName}>({collName})");
       } else {
         Contract.Assume(false);  // unexpected collection type
         throw new cce.UnreachableException();  // please compiler
diff --git a/Source/DafnyCore/Backends/JavaScript/JavaScriptCodeGenerator.cs b/Source/DafnyCore/Backends/JavaScript/JavaScriptCodeGenerator.cs
index ae7669cdeb8..a2a4f284955 100644
--- a/Source/DafnyCore/Backends/JavaScript/JavaScriptCodeGenerator.cs
+++ b/Source/DafnyCore/Backends/JavaScript/JavaScriptCodeGenerator.cs
@@ -2570,9 +2570,10 @@ protected override ConcreteSyntaxTree EmitMapBuilder_Add(MapType mt, IToken tok,
       return termLeftWriter;
     }
 
-    protected override string GetCollectionBuilder_Build(CollectionType ct, IToken tok, string collName, ConcreteSyntaxTree wr) {
+    protected override void GetCollectionBuilder_Build(CollectionType ct, IToken tok, string collName,
+      ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmt) {
       // collections are built in place
-      return collName;
+      wr.Write(collName);
     }
 
     protected override void EmitSingleValueGenerator(Expression e, bool inLetExprBody, string type, ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmts) {
diff --git a/Source/DafnyCore/Backends/Library/LibraryBackend.cs b/Source/DafnyCore/Backends/Library/LibraryBackend.cs
index f76481532bd..5f125bab805 100644
--- a/Source/DafnyCore/Backends/Library/LibraryBackend.cs
+++ b/Source/DafnyCore/Backends/Library/LibraryBackend.cs
@@ -16,6 +16,9 @@ public LibraryBackend(DafnyOptions options) : base(options) {
   public override IReadOnlySet<string> SupportedExtensions => new HashSet<string> { };
 
   public override string TargetName => "Dafny Library (.doo)";
+
+  /// Some tests still fail when using the lib back-end, for example due to disallowed assumptions being present in the test,
+  /// such as empty constructors with ensures clauses, generated from iterators
   public override bool IsStable => false;
 
   public override string TargetExtension => "doo";
diff --git a/Source/DafnyCore/Backends/Python/PythonCodeGenerator.cs b/Source/DafnyCore/Backends/Python/PythonCodeGenerator.cs
index 57993aaa13c..db66ae7bbd7 100644
--- a/Source/DafnyCore/Backends/Python/PythonCodeGenerator.cs
+++ b/Source/DafnyCore/Backends/Python/PythonCodeGenerator.cs
@@ -1827,8 +1827,9 @@ protected override Action<ConcreteSyntaxTree> GetSubtypeCondition(string tmpVarN
         : $"{tmpVarName} is None or {typeTest}");
     }
 
-    protected override string GetCollectionBuilder_Build(CollectionType ct, IToken tok, string collName, ConcreteSyntaxTree wr) {
-      return TypeHelperName(ct) + $"({collName})";
+    protected override void GetCollectionBuilder_Build(CollectionType ct, IToken tok, string collName,
+      ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmt) {
+      wr.Write(TypeHelperName(ct) + $"({collName})");
     }
 
     protected override (Type, Action<ConcreteSyntaxTree>) EmitIntegerRange(Type type, Action<ConcreteSyntaxTree> wLo, Action<ConcreteSyntaxTree> wHi) {
diff --git a/Source/DafnyCore/Backends/ResolvedDesugaredExecutableDafny/ResolvedDesugaredExecutableDafnyBackend.cs b/Source/DafnyCore/Backends/ResolvedDesugaredExecutableDafny/ResolvedDesugaredExecutableDafnyBackend.cs
index 717cb0dfc16..dd3a4d3192b 100644
--- a/Source/DafnyCore/Backends/ResolvedDesugaredExecutableDafny/ResolvedDesugaredExecutableDafnyBackend.cs
+++ b/Source/DafnyCore/Backends/ResolvedDesugaredExecutableDafny/ResolvedDesugaredExecutableDafnyBackend.cs
@@ -5,7 +5,7 @@
 namespace Microsoft.Dafny.Compilers;
 
 public class ResolvedDesugaredExecutableDafnyBackend : DafnyExecutableBackend {
-
+  protected override bool CanEmitUncompilableCode => false;
   public override IReadOnlySet<string> SupportedExtensions => new HashSet<string> { ".dfy" };
   public override string TargetName => "ResolvedDesugaredExecutableDafny";
   public override bool IsStable => true;
diff --git a/Source/DafnyCore/Backends/Rust/Dafny-compiler-rust-coverage.dfy b/Source/DafnyCore/Backends/Rust/Dafny-compiler-rust-coverage.dfy
new file mode 100644
index 00000000000..8ec52648d9e
--- /dev/null
+++ b/Source/DafnyCore/Backends/Rust/Dafny-compiler-rust-coverage.dfy
@@ -0,0 +1,200 @@
+/*This module exists to increase code coverage of the generated code
+  All modules ending with "Coverage" will be compiled to DafnyCore.Test */
+module DafnyToRustCompilerCoverage {
+  module RASTCoverage {
+    import opened RAST
+    import opened Std.Wrappers
+    import opened DAST.Format
+    import Strings = Std.Strings
+
+    method TestNoOptimize(e: Expr)
+      //requires e.Optimize() == e // Too expensive
+    {
+    }
+
+    method TestOptimizeToString() {
+      var x := Identifier("x");
+      var y := Identifier("y");
+      AssertCoverage(UnaryOp("&", Call(Select(x, "clone"), [], []), UnaryOpFormat.NoFormat).Optimize()
+                     == UnaryOp("&", x, UnaryOpFormat.NoFormat));
+      TestNoOptimize(UnaryOp("&", Call(Select(x, "clone"), [], [y]), UnaryOpFormat.NoFormat));
+      AssertCoverage(UnaryOp("!", BinaryOp("==", x, y, BinaryOpFormat.NoFormat),
+                             CombineFormat()).Optimize() == BinaryOp("!=", x, y, BinaryOpFormat.NoFormat));
+      AssertCoverage(UnaryOp("!", BinaryOp("<", x, y, BinaryOpFormat.NoFormat),
+                             CombineFormat()).Optimize() == BinaryOp(">=", x, y, BinaryOpFormat.NoFormat()));
+      AssertCoverage(UnaryOp("!", BinaryOp("<", x, y, ReverseFormat()),
+                             CombineFormat()).Optimize() == BinaryOp("<=", y, x, BinaryOpFormat.NoFormat()));
+      AssertCoverage(
+        ConversionNum(
+          I128,
+          Call(MemberSelect(
+                 MemberSelect(MemberSelect(
+                                Identifier(""),
+                                "dafny_runtime"), "DafnyInt"), "from"), [], [LiteralInt("1")])).Optimize()
+        == LiteralInt("/*optimized*/1"));
+      AssertCoverage(
+        ConversionNum(
+          I128,
+          Call(MemberSelect(
+                 MemberSelect(MemberSelect(
+                                Identifier(""), "dafny_runtime"), "DafnyInt"), "from"), [], [LiteralString("1", false)])).Optimize()
+        == LiteralInt("/*optimized*/1"));
+      TestNoOptimize(ConversionNum(I128, Call(MemberSelect(
+                                                MemberSelect(MemberSelect(
+                                                               Identifier(""), "dafny_runtime"), "DafnyInt"), "from"), [], [x])).Optimize());
+      TestNoOptimize(ConversionNum(I128, Call(MemberSelect(
+                                                MemberSelect(MemberSelect(
+                                                               Identifier(""), "dafny_runtime"), "DafnyInt"), "from"), [], [LiteralInt("1"), LiteralInt("2")])).Optimize());
+      TestNoOptimize(ConversionNum(I128, x));
+      AssertCoverage(StmtExpr(DeclareVar(MUT, "z", Some(I128), None), StmtExpr(AssignVar("z", y), RawExpr("return"))).Optimize()
+                     == StmtExpr(DeclareVar(MUT, "z", Some(I128), Some(y)), RawExpr("return")));
+      TestNoOptimize(StmtExpr(DeclareVar(MUT, "z", Some(I128), None), StmtExpr(AssignVar("w", y), RawExpr("return"))));
+
+      TestNoOptimize(x);
+      TestNoOptimize(StmtExpr(x, x));
+      TestNoOptimize(StmtExpr(Match(x, []), x));
+      TestNoOptimize(StmtExpr(StructBuild("x", []), x));
+      TestNoOptimize(StmtExpr(Tuple([]), x));
+      TestNoOptimize(StmtExpr(UnaryOp("&", x, UnaryOpFormat.NoFormat), x));
+      TestNoOptimize(StmtExpr(BinaryOp("&&", x, x, BinaryOpFormat.NoFormat), x));
+      TestNoOptimize(StmtExpr(TypeAscription(x, I128), x));
+      TestNoOptimize(StmtExpr(LiteralInt("1"), x));
+      TestNoOptimize(StmtExpr(LiteralString("1", true), x));
+      TestNoOptimize(StmtExpr(ConversionNum(I128, x), x));
+      AssertCoverage(StmtExpr(DeclareVar(MUT, "z", Some(I128), None), StmtExpr(AssignVar("z", y), RawExpr("return"))).Optimize()
+                     == StmtExpr(DeclareVar(MUT, "z", Some(I128), Some(y)), RawExpr("return")));
+
+      var coverageExpression := [
+        RawExpr("abc"),
+        Identifier("x"),
+        Match(Identifier("x"), [MatchCase(RawPattern("abc"), Identifier("x"))]),
+        StmtExpr(RawExpr("panic!()"), Identifier("a")),
+        Block(RawExpr("abc")),
+        StructBuild("dummy", [AssignIdentifier("foo", Identifier("bar"))]),
+        StructBuild("dummy", [AssignIdentifier("foo", Identifier("bar")), AssignIdentifier("foo2", Identifier("bar"))]),
+        Tuple([Identifier("x")]),
+        UnaryOp("-", Identifier("x"), UnaryOpFormat.NoFormat),
+        BinaryOp("+", Identifier("x"), Identifier("y"), BinaryOpFormat.NoFormat),
+        TypeAscription(Identifier("x"), I128),
+        LiteralInt("322"),
+        LiteralString("abc", true),
+        LiteralString("abc", false),
+        ConversionNum(I128, Identifier("x")),
+        ConversionNum(RawType("X"), Identifier("x")),
+        DeclareVar(MUT, "abc", Some(I128), None),
+        DeclareVar(CONST, "abc", None, Some(Identifier("x"))),
+        AssignVar("abc", Identifier("x")),
+        IfExpr(Identifier("x"), Identifier("x"), Identifier("x")),
+        Loop(Some(Identifier("x")), Identifier("x")),
+        For("abc", Identifier("x"), Identifier("x")),
+        Labelled("abc", Identifier("x")),
+        Break(None),
+        Break(Some("l")),
+        Continue(None),
+        Continue(Some("l")),
+        Return(None),
+        Return(Some(Identifier("x"))),
+        Call(Identifier("x"), [], []),
+        Call(Identifier("x"), [I128, I32], [Identifier("x"), Identifier("y")]),
+        Select(Identifier("x"), "abc"),
+        MemberSelect(Identifier("x"), "abc")
+      ];
+      for i := 0 to |coverageExpression| {
+        var c := coverageExpression[i];
+        var _ := c.printingInfo;
+        var _ := c.Optimize();
+        var _ := map[c := c.ToString("")];
+        var _ := StmtExpr(DeclareVar(MUT, "abc", Some(I128), None), c).Optimize();
+        var _ := StmtExpr(DeclareVar(MUT, "abc", Some(I128), None), StmtExpr(AssignVar("abc", c), RawExpr(""))).Optimize();
+        var _ := UnaryOp("&", c, UnaryOpFormat.NoFormat()).Optimize();
+        var _ := UnaryOp("!", c, UnaryOpFormat.NoFormat()).Optimize();
+        var _ := ConversionNum(U8, c).Optimize();
+        var _ := ConversionNum(U8, Call(c, [], [])).Optimize();
+        var _ := ConversionNum(U8, Call(MemberSelect(c, "from"), [], [])).Optimize();
+        var _ := ConversionNum(U8, Call(MemberSelect(MemberSelect(c, "DafnyInt"), "from"), [], [])).Optimize();
+        var _ := ConversionNum(U8, Call(MemberSelect(MemberSelect(MemberSelect(c, "dafny_runtime"), "DafnyInt"), "from"), [], [])).Optimize();
+        var _ := ConversionNum(U8, Call(MemberSelect(
+                                          MemberSelect(MemberSelect(
+                                                         Identifier(""), "dafny_runtime"), "DafnyInt"), "from"), [], [c])).Optimize();
+        var _ := c.RightMostIdentifier();
+
+      }
+    }
+
+    method TestPrintingInfo() {
+      var x := Identifier("x");
+      var y := Identifier("y");
+      var bnf := BinaryOpFormat.NoFormat;
+      AssertCoverage(RawExpr("x").printingInfo.UnknownPrecedence?);
+      AssertCoverage(x.printingInfo == Precedence(1));
+      AssertCoverage(LiteralInt("3").printingInfo == Precedence(1));
+      AssertCoverage(LiteralString("abc", true).printingInfo == Precedence(1));
+      AssertCoverage(UnaryOp("?", x, UnaryOpFormat.NoFormat).printingInfo == SuffixPrecedence(5));
+      AssertCoverage(UnaryOp("-", x, UnaryOpFormat.NoFormat).printingInfo == Precedence(6));
+      AssertCoverage(UnaryOp("*", x, UnaryOpFormat.NoFormat).printingInfo == Precedence(6));
+      AssertCoverage(UnaryOp("!", x, UnaryOpFormat.NoFormat).printingInfo == Precedence(6));
+      AssertCoverage(UnaryOp("&", x, UnaryOpFormat.NoFormat).printingInfo == Precedence(6));
+      AssertCoverage(UnaryOp("&mut", x, UnaryOpFormat.NoFormat).printingInfo == Precedence(6));
+      AssertCoverage(UnaryOp("!!", x, UnaryOpFormat.NoFormat).printingInfo == UnknownPrecedence());
+      AssertCoverage(Select(x, "name").printingInfo == PrecedenceAssociativity(2, LeftToRight));
+      AssertCoverage(MemberSelect(x, "name").printingInfo == PrecedenceAssociativity(2, LeftToRight));
+      AssertCoverage(Call(x, [], []).printingInfo == PrecedenceAssociativity(2, LeftToRight));
+      AssertCoverage(TypeAscription(x, I128).printingInfo == PrecedenceAssociativity(10, LeftToRight));
+      AssertCoverage(BinaryOp("*", x, y, bnf).printingInfo == PrecedenceAssociativity(20, LeftToRight));
+      AssertCoverage(BinaryOp("/", x, y, bnf).printingInfo == PrecedenceAssociativity(20, LeftToRight));
+      AssertCoverage(BinaryOp("%", x, y, bnf).printingInfo == PrecedenceAssociativity(20, LeftToRight));
+      AssertCoverage(BinaryOp("+", x, y, bnf).printingInfo == PrecedenceAssociativity(30, LeftToRight));
+      AssertCoverage(BinaryOp("-", x, y, bnf).printingInfo == PrecedenceAssociativity(30, LeftToRight));
+      AssertCoverage(BinaryOp("<<", x, y, bnf).printingInfo == PrecedenceAssociativity(40, LeftToRight));
+      AssertCoverage(BinaryOp(">>", x, y, bnf).printingInfo == PrecedenceAssociativity(40, LeftToRight));
+      AssertCoverage(BinaryOp("&", x, y, bnf).printingInfo == PrecedenceAssociativity(50, LeftToRight));
+      AssertCoverage(BinaryOp("^", x, y, bnf).printingInfo == PrecedenceAssociativity(60, LeftToRight));
+      AssertCoverage(BinaryOp("|", x, y, bnf).printingInfo == PrecedenceAssociativity(70, LeftToRight));
+      AssertCoverage(BinaryOp("==", x, y, bnf).printingInfo == PrecedenceAssociativity(80, RequiresParentheses));
+      AssertCoverage(BinaryOp("!=", x, y, bnf).printingInfo == PrecedenceAssociativity(80, RequiresParentheses));
+      AssertCoverage(BinaryOp("<", x, y, bnf).printingInfo == PrecedenceAssociativity(80, RequiresParentheses));
+      AssertCoverage(BinaryOp(">", x, y, bnf).printingInfo == PrecedenceAssociativity(80, RequiresParentheses));
+      AssertCoverage(BinaryOp("<=", x, y, bnf).printingInfo == PrecedenceAssociativity(80, RequiresParentheses));
+      AssertCoverage(BinaryOp(">=", x, y, bnf).printingInfo == PrecedenceAssociativity(80, RequiresParentheses));
+      AssertCoverage(BinaryOp("&&", x, y, bnf).printingInfo == PrecedenceAssociativity(90, LeftToRight));
+      AssertCoverage(BinaryOp("||", x, y, bnf).printingInfo == PrecedenceAssociativity(100, LeftToRight));
+      AssertCoverage(BinaryOp("..", x, y, bnf).printingInfo == PrecedenceAssociativity(110, RequiresParentheses));
+      AssertCoverage(BinaryOp("..=", x, y, bnf).printingInfo == PrecedenceAssociativity(110, RequiresParentheses));
+      AssertCoverage(BinaryOp("=", x, y, bnf).printingInfo == PrecedenceAssociativity(110, RightToLeft));
+      AssertCoverage(BinaryOp("+=", x, y, bnf).printingInfo == PrecedenceAssociativity(110, RightToLeft));
+      AssertCoverage(BinaryOp("-=", x, y, bnf).printingInfo == PrecedenceAssociativity(110, RightToLeft));
+      AssertCoverage(BinaryOp("*=", x, y, bnf).printingInfo == PrecedenceAssociativity(110, RightToLeft));
+      AssertCoverage(BinaryOp("/=", x, y, bnf).printingInfo == PrecedenceAssociativity(110, RightToLeft));
+      AssertCoverage(BinaryOp("%=", x, y, bnf).printingInfo == PrecedenceAssociativity(110, RightToLeft));
+      AssertCoverage(BinaryOp("&=", x, y, bnf).printingInfo == PrecedenceAssociativity(110, RightToLeft));
+      AssertCoverage(BinaryOp("|=", x, y, bnf).printingInfo == PrecedenceAssociativity(110, RightToLeft));
+      AssertCoverage(BinaryOp("^=", x, y, bnf).printingInfo == PrecedenceAssociativity(110, RightToLeft));
+      AssertCoverage(BinaryOp("<<=", x, y, bnf).printingInfo == PrecedenceAssociativity(110, RightToLeft));
+      AssertCoverage(BinaryOp(">>=", x, y, bnf).printingInfo == PrecedenceAssociativity(110, RightToLeft));
+      AssertCoverage(BinaryOp("?!?", x, y, bnf).printingInfo == PrecedenceAssociativity(0, RequiresParentheses));
+      AssertCoverage(Break(None).printingInfo == UnknownPrecedence());
+    }
+
+    method TestExpr() {
+      TestOptimizeToString();
+      TestPrintingInfo();
+      TestNoExtraSemicolonAfter();
+    }
+
+    method AssertCoverage(x: bool)
+      //requires x // Too expensive
+    {
+    }
+
+    method TestNoExtraSemicolonAfter() {
+      AssertCoverage(RawExpr(";").NoExtraSemicolonAfter());
+      AssertCoverage(!RawExpr("a").NoExtraSemicolonAfter());
+      AssertCoverage(Return(None).NoExtraSemicolonAfter());
+      AssertCoverage(Continue(None).NoExtraSemicolonAfter());
+      AssertCoverage(Break(None).NoExtraSemicolonAfter());
+      AssertCoverage(AssignVar("x", Identifier("y")).NoExtraSemicolonAfter());
+      AssertCoverage(DeclareVar(MUT, "x", None, None).NoExtraSemicolonAfter());
+      AssertCoverage(!Identifier("x").NoExtraSemicolonAfter());
+    }
+  }
+}
diff --git a/Source/DafnyCore/Backends/Rust/Dafny-compiler-rust-proofs.dfy b/Source/DafnyCore/Backends/Rust/Dafny-compiler-rust-proofs.dfy
index d3cffac5365..8795199f9a0 100644
--- a/Source/DafnyCore/Backends/Rust/Dafny-compiler-rust-proofs.dfy
+++ b/Source/DafnyCore/Backends/Rust/Dafny-compiler-rust-proofs.dfy
@@ -1,53 +1,52 @@
-
-
-
-
-
 include "../Dafny/AST.dfy"
 
-module {:extern "DCOMPProofs"} {:compile false} DCOMPProofs refines DCOMP {
+/*This module does not contain any compiled code because it
+  only proves properties about DCOMP. In a sense, it's a test file. */
+module {:extern "DafnyToRustCompilerProofs"} {:compile false} DafnyToRustCompilerProofs {
+  import opened DafnyToRustCompiler
+
+  ghost predicate IsDafnyId(s: string) {
+    && |s| > 0 && s[0] in "aqkhd" &&
+       IsDafnyIdTail(s[1..])
+  }
 
   ghost predicate IsDafnyIdTail(s: string) {
     |s| == 0 ||
     (s[0] in "aqkhd_?'#." && IsDafnyIdTail(s[1..]))
   }
 
-  ghost predicate IsDafnyId(s: string) {
-    && |s| > 0 && s[0] in "aqkhd" &&
-       IsDafnyIdTail(s[1..])
-  }
   lemma IsDafnyIdImpliesDafnyIdTail(s: string)
     requires IsDafnyId(s)
     ensures IsDafnyIdTail(s)
   {}
 
-  function dafnyEscape(s: string): string {
+  function DafnyEscape(s: string): string {
     if |s| == 0 then "" else
-    if s[0] == '_' then "__" + dafnyEscape(s[1..]) else
-    if s[0] == '?' then "_q" + dafnyEscape(s[1..]) else
-    if s[0] == '\'' then "_k" + dafnyEscape(s[1..]) else
-    if s[0] == '#' then "_h" + dafnyEscape(s[1..]) else
-    [s[0]] + dafnyEscape(s[1..])
+    if s[0] == '_' then "__" + DafnyEscape(s[1..]) else
+    if s[0] == '?' then "_q" + DafnyEscape(s[1..]) else
+    if s[0] == '\'' then "_k" + DafnyEscape(s[1..]) else
+    if s[0] == '#' then "_h" + DafnyEscape(s[1..]) else
+    [s[0]] + DafnyEscape(s[1..])
   }
 
-  function dafnyEscapeReverse(s: string): string {
+  function DafnyUnescape(s: string): string {
     if |s| <= 1 then s else
     if s[0] == '_' then
-      if s[1] == '_' then "_" + dafnyEscapeReverse(s[2..]) else
-      if s[1] == 'q' then "?" + dafnyEscapeReverse(s[2..]) else
-      if s[1] == 'k' then "'" + dafnyEscapeReverse(s[2..]) else
-      if s[1] == 'h' then "#" + dafnyEscapeReverse(s[2..]) else
-      s[..1] + dafnyEscapeReverse(s[1..])
+      if s[1] == '_' then "_" + DafnyUnescape(s[2..]) else
+      if s[1] == 'q' then "?" + DafnyUnescape(s[2..]) else
+      if s[1] == 'k' then "'" + DafnyUnescape(s[2..]) else
+      if s[1] == 'h' then "#" + DafnyUnescape(s[2..]) else
+      s[..1] + DafnyUnescape(s[1..])
     else
-      s[..1] + dafnyEscapeReverse(s[1..])
+      s[..1] + DafnyUnescape(s[1..])
   }
 
-  lemma dafnyEscapeBijective(s: string)
-    ensures dafnyEscapeReverse(dafnyEscape(s)) == s
+  lemma DafnyEscapeBijective(s: string)
+    ensures DafnyUnescape(DafnyEscape(s)) == s
   {
     if |s| == 0 {
     } else {
-      dafnyEscapeBijective(s[1..]);
+      DafnyEscapeBijective(s[1..]);
       if s[0] == '_' {
       } else if s[0] == '?' {
       } else if s[0] == '\'' {
@@ -57,13 +56,13 @@ module {:extern "DCOMPProofs"} {:compile false} DCOMPProofs refines DCOMP {
     }
   }
 
-  lemma dafnyEscapeCharacteristic(s: string)
+  lemma DafnyEscapeCharacteristic(s: string)
     requires IsDafnyIdTail(s)
-    ensures isDafnyEncodedIdTail(dafnyEscape(s))
+    ensures IsDafnyEncodedIdTail(DafnyEscape(s))
   {
     if |s| == 0 {
     } else {
-      dafnyEscapeCharacteristic(s[1..]);
+      DafnyEscapeCharacteristic(s[1..]);
       if s[0] == '_' {
       } else if s[0] == '?' {
       } else if s[0] == '\'' {
@@ -73,79 +72,79 @@ module {:extern "DCOMPProofs"} {:compile false} DCOMPProofs refines DCOMP {
     }
   }
 
-  function reverseReplaceDots(i: string): string {
+  function ReverseReplaceDots(i: string): string {
     if |i| <= 1 then i
     else if i[0] == '_' then
-      if i[1] == 'd' then "." + reverseReplaceDots(i[2..])
-      else [i[0]] + [i[1]] + reverseReplaceDots(i[2..])
+      if i[1] == 'd' then "." + ReverseReplaceDots(i[2..])
+      else [i[0]] + [i[1]] + ReverseReplaceDots(i[2..])
     else
-      [i[0]] + reverseReplaceDots(i[1..])
+      [i[0]] + ReverseReplaceDots(i[1..])
   }
 
-  predicate isDafnyEncodedIdTail(i: string) {
+  predicate IsDafnyEncodedIdTail(i: string) {
     if |i| == 0 then true
     else
     if i[0] == '_' then
       |i| >= 2 &&
-      i[1] in "_qkh" && isDafnyEncodedIdTail(i[2..])
+      i[1] in "_qkh" && IsDafnyEncodedIdTail(i[2..])
     else
       i[0] in "aqkhd." &&
-      isDafnyEncodedIdTail(i[1..])
+      IsDafnyEncodedIdTail(i[1..])
   }
 
-  predicate isDafnyEncodedId(i: string) {
+  predicate IsDafnyEncodedId(i: string) {
     if |i| == 0 then true
-    else i[0] in "aqkhd" && isDafnyEncodedIdTail(i[1..])
+    else i[0] in "aqkhd" && IsDafnyEncodedIdTail(i[1..])
   }
 
-  lemma dafnyEscapeCorrect(s: string)
+  lemma DafnyEscapeCorrect(s: string)
     requires IsDafnyIdTail(s)
-    ensures isDafnyEncodedIdTail(dafnyEscape(s))
-            && (IsDafnyId(s) && |s| > 0 ==> dafnyEscape(s)[0] in "aqkhd")
+    ensures IsDafnyEncodedIdTail(DafnyEscape(s))
+            && (IsDafnyId(s) && |s| > 0 ==> DafnyEscape(s)[0] in "aqkhd")
   {
     if |s| == 0 {
     } else {
-      if s[0] == '_' { // "__" + dafnyEscape(s[1..])
-      } else if s[0] == '?' { // "_q" + dafnyEscape(s[1..]) else
-      } else if s[0] == '\'' { // "_k" + dafnyEscape(s[1..]) else
-      } else if s[0] == '#' { // "_h" + dafnyEscape(s[1..]) else=
-      } else { // [s[0]] + dafnyEscape(s[1..])=
-        dafnyEscapeCorrect(s[1..]);
+      if s[0] == '_' { // "__" + DafnyEscape(s[1..])
+      } else if s[0] == '?' { // "_q" + DafnyEscape(s[1..]) else
+      } else if s[0] == '\'' { // "_k" + DafnyEscape(s[1..]) else
+      } else if s[0] == '#' { // "_h" + DafnyEscape(s[1..]) else=
+      } else { // [s[0]] + DafnyEscape(s[1..])=
+        DafnyEscapeCorrect(s[1..]);
       }
     }
   }
-  // replaceDots is not reversible generally speaking.
+  // replaceDots is not invertible generally speaking.
   // Indeed, both _d and . get translated to _d.
-  lemma replaceDotsNotReversible()
+  lemma ReplaceDotsNotInvertible()
     ensures replaceDots("_d") == replaceDots(".")
-    ensures !isDafnyEncodedIdTail("_d")
+    ensures !IsDafnyEncodedIdTail("_d")
   {}
 
-  // However, if we restrict ourself to a Dafny encoding, it's reversible
-  lemma {:rlimit 500}
-  replaceDotsReversible(i: string)
-    requires isDafnyEncodedIdTail(i)
-    ensures reverseReplaceDots(replaceDots(i)) == i
+  // However, if we restrict ourself to a Dafny encoding, it's invertible
+  lemma {:rlimit 2500} {:vcs_split_on_every_assert} // {:resource_limit 500e3}
+  ReplaceDotsInvertible(i: string)
+    requires IsDafnyEncodedIdTail(i)
+    ensures ReverseReplaceDots(replaceDots(i)) == i
   {
     if |i| == 0 {
     } else if i[0] == '.' { //"_d" + replaceDots(i[1..])
-      replaceDotsReversible(i[1..]);
-      assert reverseReplaceDots(replaceDots(i)) == i;
+      ReplaceDotsInvertible(i[1..]);
+      assert ReverseReplaceDots(replaceDots(i)) == i;
     } else { // [i[0]] + replaceDots(i[1..])
       assert replaceDots(i) == [i[0]] + replaceDots(i[1..]);
       if i[0] == '_' {
         assert |i| >= 2 &&
-               i[1] in "_qkh" && isDafnyEncodedIdTail(i[2..]);
-        replaceDotsReversible(i[2..]);
-        assert reverseReplaceDots(replaceDots(i)) == i;
+               i[1] in "_qkh" && IsDafnyEncodedIdTail(i[2..]);
+        ReplaceDotsInvertible(i[2..]);
+        assert ReverseReplaceDots(replaceDots(i)) == i;
       } else {
-        replaceDotsReversible(i[1..]);
-        assert reverseReplaceDots(replaceDots(i)) == i;
+        ReplaceDotsInvertible(i[1..]);
+        assert ReverseReplaceDots(replaceDots(i)) == i;
       }
     }
   }
 
-  // The reason why escapeIndent is correct is that
+  // The reason why escapeIdent is correct is that
   // - It receives either
   //     - a Dafny-encoded Id that has no special character (only letters + "__" which came from "_")
   //       and is not a reserved Rust keyword
@@ -162,13 +161,13 @@ module {:extern "DCOMPProofs"} {:compile false} DCOMPProofs refines DCOMP {
   //   - If the input is a Dafny-encoded Id or a tuple numeric,
   //     it can find the original identifier based in the output
 
-  lemma better_tuple_builder_name_not_rsharp(i: string)
+  lemma BetterTupleBuilderNameNotRsharp(i: string)
     ensures is_tuple_builder(i) ==>
               var s := better_tuple_builder_name(i);
               s[0..2] != "r#"
   {}
 
-  lemma idiomatic_rust_not_rsharp(i: string)
+  lemma IdiomaticRustNotRsharp(i: string)
     ensures
       !has_special(i)
       ==>
@@ -187,7 +186,7 @@ module {:extern "DCOMPProofs"} {:compile false} DCOMPProofs refines DCOMP {
     }
   }
 
-  lemma {:fuel has_special, 2, 3} escapeIndentExamples()
+  lemma {:fuel has_special, 2, 3} EscapeIdentExamples()
     ensures escapeIdent("i") == "i"   // Loop variable
     ensures escapeIdent("_1") == "_1" // tuple deconstructor
     ensures escapeIdent("_m") == "_m" // any hidden variable
@@ -200,33 +199,33 @@ module {:extern "DCOMPProofs"} {:compile false} DCOMPProofs refines DCOMP {
   }
 
   // Just convert all underscores to double underscores
-  function reverse_idiomatic_rust(s: string): string {
+  function ReverseIdiomaticRust(s: string): string {
     if |s| == 0 then ""
     else if s[0] == '_' then
-      "__" + reverse_idiomatic_rust(s[1..])
+      "__" + ReverseIdiomaticRust(s[1..])
     else
-      [s[0]] + reverse_idiomatic_rust(s[1..])
+      [s[0]] + ReverseIdiomaticRust(s[1..])
   }
 
-  lemma {:rlimit 200} idiomatic_rust_reversible(i: string)
+  lemma {:rlimit 200} IdiomaticRustInvertible(i: string)
     requires !has_special(i)
-    ensures reverse_idiomatic_rust(idiomatic_rust(i)) == i
+    ensures ReverseIdiomaticRust(idiomatic_rust(i)) == i
   {
     if |i| == 0 {
     } else if i[0] == '_' {
-      idiomatic_rust_reversible(i[2..]);
+      IdiomaticRustInvertible(i[2..]);
       assert 2 <= |i| && i[1] == '_';
       var ss := ['_'] + idiomatic_rust(i[2..]);
       assert ss[0] == '_' && |ss| != 0;
     } else {
-      idiomatic_rust_reversible(i[1..]);
+      IdiomaticRustInvertible(i[1..]);
     }
   }
 
-  function reverseEscapeIdent(s: string): string {
+  function UnescapeIdent(s: string): string {
     if |s| >= 2 && s[0..2] == "r#" then
       if |s| >= 3 && s[2] == '_' then
-        reverseReplaceDots(s[3..]) // General escape
+        ReverseReplaceDots(s[3..]) // General escape
       else
         s[2..] // Keyword
     else if |s| >= 1 && s[0] == '_' then
@@ -237,88 +236,88 @@ module {:extern "DCOMPProofs"} {:compile false} DCOMPProofs refines DCOMP {
       else
         s
     else // Idiomatic rust
-      reverse_idiomatic_rust(s)
+      ReverseIdiomaticRust(s)
   }
 
-  lemma tupleIdentReversible(s: string)
+  lemma TupleIdentInvertible(s: string)
     requires is_tuple_numeric(s)
-    ensures reverseEscapeIdent(escapeIdent(s)) == s
+    ensures UnescapeIdent(escapeIdent(s)) == s
   {}
 
-  lemma {:rlimit 500} tupleBuilderReversible(i: string)
+  lemma {:rlimit 500} TupleBuilderInvertible(i: string)
     requires !is_tuple_numeric(i)
     requires is_tuple_builder(i)
-    ensures reverseEscapeIdent(escapeIdent(i)) == i
+    ensures UnescapeIdent(escapeIdent(i)) == i
   {
     var s := "_T" + i[8..];
     calc {
-      reverseEscapeIdent(escapeIdent(i));
-      reverseEscapeIdent(s);
+      UnescapeIdent(escapeIdent(i));
+      UnescapeIdent(s);
       i[0..8] + s[2..];
       i;
     }
   }
 
-  lemma {:rlimit 800} reservedRustReversible(i: string)
+  lemma {:rlimit 800} ReservedRustInvertible(i: string)
     requires !is_tuple_numeric(i)
     requires !is_tuple_builder(i)
     requires i in reserved_rust
-    ensures reverseEscapeIdent(escapeIdent(i)) == i
+    ensures UnescapeIdent(escapeIdent(i)) == i
   {
     assert i[0] != '_';
     var s := "r#" + i;
     calc {
-      reverseEscapeIdent(escapeIdent(i));
-      reverseEscapeIdent(s);
+      UnescapeIdent(escapeIdent(i));
+      UnescapeIdent(s);
       s[2..];
       i;
     }
   }
 
-  lemma {:rlimit 800} idiomaticRustReversible(i: string)
-    requires isDafnyEncodedId(i) // Needed to ensure i does not start with '_'
+  lemma {:rlimit 800} EscapeIdentInvertibleForIdiomaticRust(i: string)
+    requires IsDafnyEncodedId(i) // Needed to ensure i does not start with '_'
     requires !is_tuple_numeric(i)
     requires !is_tuple_builder(i)
     requires i !in reserved_rust
-    requires is_idiomatic_rust(i)
-    ensures reverseEscapeIdent(escapeIdent(i)) == i
+    requires is_idiomatic_rust_id(i)
+    ensures UnescapeIdent(escapeIdent(i)) == i
   {
     var s := idiomatic_rust(i);
-    idiomatic_rust_not_rsharp(i);
+    IdiomaticRustNotRsharp(i);
     assert |s| < 2 || s[0..2] != "r#" by {
       if |s| >= 2 && s[0..2] == "r#" {
         assert s[1] == '#';
-        idiomatic_rust_not_rsharp(i[1..]);
+        IdiomaticRustNotRsharp(i[1..]);
       }
     }
     assert s[0] != '_';
     calc {
-      reverseEscapeIdent(escapeIdent(i));
-      reverseEscapeIdent(idiomatic_rust(i));
-      reverse_idiomatic_rust(idiomatic_rust(i));
-      { idiomatic_rust_reversible(i); }
+      UnescapeIdent(escapeIdent(i));
+      UnescapeIdent(idiomatic_rust(i));
+      ReverseIdiomaticRust(idiomatic_rust(i));
+      { IdiomaticRustInvertible(i); }
       i;
     }
   }
 
-  lemma {:rlimit 800} dafnyGeneratedIdReversible(s: string)
+  lemma {:rlimit 800} EscapeIdentInvertibleForDafnyGeneratedId(s: string)
     requires !is_tuple_numeric(s)
     requires !is_tuple_builder(s)
     requires s !in reserved_rust
-    requires !is_idiomatic_rust(s)
+    requires !is_idiomatic_rust_id(s)
     requires is_dafny_generated_id(s)
-    ensures reverseEscapeIdent(escapeIdent(s)) == s
+    ensures UnescapeIdent(escapeIdent(s)) == s
   {
   }
 
-  lemma {:rlimit 800} everythingElseReversible(i: string)
-    requires isDafnyEncodedId(i) // Needed to ensure i does not start with '_'
+  lemma {:rlimit 800} EverythingElseInvertible(i: string)
+    requires IsDafnyEncodedId(i) // Needed to ensure i does not start with '_'
     requires !is_tuple_numeric(i)
     requires !is_tuple_builder(i)
     requires i !in reserved_rust
-    requires !is_idiomatic_rust(i)
+    requires !is_idiomatic_rust_id(i)
     requires !is_dafny_generated_id(i)
-    ensures reverseEscapeIdent(escapeIdent(i)) == i
+    ensures UnescapeIdent(escapeIdent(i)) == i
   {
     var r := replaceDots(i);
     var s := "r#_" + r;
@@ -326,36 +325,36 @@ module {:extern "DCOMPProofs"} {:compile false} DCOMPProofs refines DCOMP {
     assert |s| >= 3 && s[2] == '_';
     assert s[3..] == r;
     calc {
-      reverseEscapeIdent(escapeIdent(i));
-      reverseEscapeIdent(s);
-      reverseReplaceDots(replaceDots(i));
-      { replaceDotsReversible(i); }
+      UnescapeIdent(escapeIdent(i));
+      UnescapeIdent(s);
+      ReverseReplaceDots(replaceDots(i));
+      { ReplaceDotsInvertible(i); }
       i;
     }
   }
 
   // That's the lemma that shows
-  lemma escapeIdentReversible(i: string)
+  lemma EscapeIdentInvertible(i: string)
     requires is_tuple_numeric(i) // _0 _1 ...                 => _0, _1 ...
              || is_tuple_builder(i) // ___hMake0, ____hMake1 ... => _T0, _T1 ...
              || i in reserved_rust  // fn, impl, mod ...         => r#fn, r#impl, r#mod...
-             || isDafnyEncodedId(i) // i                         => i
+             || IsDafnyEncodedId(i) // i                         => i
                                     // create_struct             => create_struct
     //  c#ons.tant?'              => r#_c_hons_dtant_q_k
-    ensures reverseEscapeIdent(escapeIdent(i)) == i
+    ensures UnescapeIdent(escapeIdent(i)) == i
   {
     if is_tuple_numeric(i) {
-      tupleIdentReversible(i);
+      TupleIdentInvertible(i);
     } else if is_tuple_builder(i) {
-      tupleBuilderReversible(i);
+      TupleBuilderInvertible(i);
     } else if i in reserved_rust {
-      assert reverseEscapeIdent(escapeIdent(i)) == i;
-    } else if is_idiomatic_rust(i) {
-      idiomaticRustReversible(i);
+      assert UnescapeIdent(escapeIdent(i)) == i;
+    } else if is_idiomatic_rust_id(i) {
+      EscapeIdentInvertibleForIdiomaticRust(i);
     } else if is_dafny_generated_id(i) { // TODO: Mov up so that we can put it in specifications
-      dafnyGeneratedIdReversible(i);
+      EscapeIdentInvertibleForDafnyGeneratedId(i);
     } else {
-      everythingElseReversible(i);
+      EverythingElseInvertible(i);
     }
   }
 
diff --git a/Source/DafnyCore/Backends/Rust/Dafny-compiler-rust.dfy b/Source/DafnyCore/Backends/Rust/Dafny-compiler-rust.dfy
index f8e186616e5..47b25b35f80 100644
--- a/Source/DafnyCore/Backends/Rust/Dafny-compiler-rust.dfy
+++ b/Source/DafnyCore/Backends/Rust/Dafny-compiler-rust.dfy
@@ -1,15 +1,19 @@
 include "../Dafny/AST.dfy"
+  // Dafny to Rust compilation tenets:
+  // - The Compiled Dafny AST should be minimal
+  // - The generated code should look idiomatic and close to the original Dafny file if possible
 
 // Rust AST
-module RAST {
+module RAST
+  // All ToString methods should produce well-formed Rust code
+{
   import opened Std.Wrappers
-  import opened Std.Strings
+  import opened DAST.Format
+  import Strings = Std.Strings
 
   const IND := "  "
-  // Indentation level
-  /* trait ModDecl {} */
 
-  datatype Mod /*extends ModDecl*/ =
+  datatype Mod =
       // Rust modules
     | Mod(name: string, body: seq<ModDecl>)
     | ExternMod(name: string)
@@ -36,6 +40,15 @@ module RAST {
     if |s| == 0 then "" else
     f(s[0]) + (if |s| > 1 then separator + SeqToString(s[1..], f, separator) else "")
   }
+  function SeqToHeight<T>(s: seq<T>, f: T --> nat): (r: nat)
+    requires forall t <- s :: f.requires(t)
+    ensures forall t <- s :: f(t) <= r
+  {
+    if |s| == 0 then 0 else
+    var i := f(s[0]);
+    var j := SeqToHeight(s[1..], f);
+    if i < j then j else i
+  }
   datatype ModDecl =
     | RawDecl(body: string)
     | ModDecl(mod: Mod)
@@ -76,9 +89,17 @@ module RAST {
     }
   }
 
+  datatype NamelessFormal =
+    NamelessFormal(visibility: Visibility, tpe: Type)
+  {
+    function ToString(ind: string): string {
+      (if visibility == PUB then "pub " else "") + tpe.ToString(ind)
+    }
+  }
+
   datatype Formals =
     | NamedFormals(fields: seq<Formal>)
-    | NamelessFormals(types: seq<Type>)
+    | NamelessFormals(types: seq<NamelessFormal>)
   {
     function ToString(ind: string, newLine: bool): string {
       if NamedFormals? then
@@ -97,7 +118,7 @@ module RAST {
         assert NamelessFormals?;
         var separator := if newLine then ",\n" + ind + IND else ", ";
         "("+
-        SeqToString(types, (t: Type) => t.ToString(ind + IND), separator)
+        SeqToString(types, (t: NamelessFormal) => t.ToString(ind + IND), separator)
         +")"
     }
   }
@@ -128,29 +149,141 @@ module RAST {
     }
   }
 
+  type TypeParamConstraint = Type
+
   datatype TypeParam =
-    | RawTypeParam(content: string)
+    | RawTypeParam(content: string, constraints: seq<TypeParamConstraint>)
   {
     static function ToStringMultiple(typeParams: seq<TypeParam>, ind: string): string {
       if |typeParams| == 0 then "" else
-      "<" + SeqToString(typeParams, (t: TypeParam) => t.ToString(ind + IND), ",") + ">"
+      "<" + SeqToString(typeParams, (t: TypeParam) => t.ToString(ind + IND), ", ") + ">"
+    }
+    static function {:tailrecursion true} AddConstraintsMultiple(
+      typeParams: seq<TypeParam>, constraints: seq<TypeParamConstraint>
+    ): seq<TypeParam> {
+      if |typeParams| == 0 then []
+      else
+        [typeParams[0].AddConstraints(constraints)] + AddConstraintsMultiple(typeParams[1..], constraints)
+    }
+    function AddConstraints(constraints: seq<TypeParamConstraint>): TypeParam {
+      this.(constraints := this.constraints + constraints)
     }
     function ToString(ind: string): string {
-      content
+      content + (
+        if |constraints| == 0 then
+          ""
+        else
+          ": " + SeqToString(constraints, (t: TypeParamConstraint) requires t < this =>
+                               t.ToString(ind + IND), " + "))
     }
   }
+  const Self := Borrowed(SelfOwned)
+  const SelfMut := BorrowedMut(SelfOwned)
+  function Rc(underlying: Type): Type {
+    TypeApp(std_type.MSel("rc").MSel("Rc"), [underlying])
+  }
+  function RefCell(underlying: Type): Type {
+    TypeApp(std_type.MSel("cell").MSel("RefCell"), [underlying])
+  }
+  function Vec(underlying: Type): Type {
+    TypeApp(std_type.MSel("vec").MSel("Vec"), [underlying])
+  }
+  function NewVec(elements: seq<Expr>): Expr {
+    Call(Identifier("vec!"), [], elements)
+  }
+  function Clone(underlying: Expr): Expr {
+    Call(Select(underlying, "clone"), [], [])
+  }
+  function Borrow(underlying: Expr): Expr {
+    UnaryOp("&", underlying, UnaryOpFormat.NoFormat)
+  }
+  function BorrowMut(underlying: Expr): Expr {
+    UnaryOp("&mut", underlying, UnaryOpFormat.NoFormat)
+  }
+
+  const CloneTrait := RawType("Clone")
+  const DafnyPrintTrait := RawType("::dafny_runtime::DafnyPrint")
+  const DefaultTrait := RawType("::std::default::Default")
+  const StaticTrait := RawType("'static")
+
+  function RawType(content: string): Type {
+    TIdentifier(content)
+  }
+
   datatype Type =
-    | Self | SelfOwned | SelfMut
-    | RawType(content: string)
+    | SelfOwned
+    | U8 | U16 | U32 | U64 | U128 | I8 | I16 | I32 | I64 | I128
+    | TIdentifier(name: string)
+    | TMemberSelect(base: Type, name: string)
+    | TypeApp(baseName: Type, arguments: seq<Type>)
+    | Borrowed(underlying: Type)
+    | BorrowedMut(underlying: Type)
+    | ImplType(underlying: Type)
+    | DynType(underlying: Type)
+    | TupleType(arguments: seq<Type>)
+    | FnType(arguments: seq<Type>, returnType: Type)
+    | IntersectionType(left: Type, right: Type)
   {
     function ToString(ind: string): string {
-      if Self? then "&Self" else
-      if SelfOwned? then "Self" else
-      if SelfMut? then "&mut Self" else
-      content
+      match this {
+        case TIdentifier(underlying) => underlying
+        case TMemberSelect(underlying, name) => underlying.ToString(ind) + "::" + name
+        case Borrowed(underlying) => "&" + underlying.ToString(ind)
+        case BorrowedMut(underlying) => "&mut " + underlying.ToString(ind)
+        case ImplType(underlying) => "impl " + underlying.ToString(ind)
+        case DynType(underlying) => "dyn " + underlying.ToString(ind)
+        case FnType(arguments, returnType) =>
+          "::std::ops::Fn("+
+          SeqToString(arguments, (arg: Type) requires arg < this =>
+                        arg.ToString(ind + IND), ", ")
+          +") -> " + returnType.ToString(ind + IND)
+        case IntersectionType(left, right) =>
+          left.ToString(ind) + " + " + right.ToString(ind)
+        case TupleType(args) =>
+          (if args == [] then
+             "()"
+           else
+             "(" +
+             SeqToString(args, (arg: Type) requires arg < this => arg.ToString(ind + IND), ", ")
+             + ")")
+        case TypeApp(base, args) =>
+          base.ToString(ind) +
+          (if args == [] then
+             ""
+           else
+             "<" +
+             SeqToString(args, (arg: Type) requires arg < this => arg.ToString(ind + IND), ", ")
+             + ">")
+
+        case SelfOwned() => "Self"
+        case U8() => "u8"
+        case U16() => "u16"
+        case U32() => "u32"
+        case U64() => "u64"
+        case U128() => "u128"
+        case I8() => "i8"
+        case I16() => "i16"
+        case I32() => "i32"
+        case I64() => "i64"
+        case I128() => "i128"
+      }
+    }
+
+    function MSel(name: string): Type {
+      TMemberSelect(this, name)
+    }
+
+    function Apply1(arg: Type): Type {
+      TypeApp(this, [arg])
     }
   }
 
+  const global_type := TIdentifier("")
+  const std_type := global_type.MSel("std")
+  const cell_type := std_type.MSel("cell")
+  const refcell_type := cell_type.MSel("RefCell")
+  const dafny_runtime_type := global_type.MSel("dafny_runtime")
+
   datatype Trait =
     | Trait(typeParams: seq<TypeParam>, tpe: Type, where: string, body: seq<ImplMember>)
   {
@@ -178,7 +311,7 @@ module RAST {
   }
   datatype ImplMember =
     | RawImplMember(content: string)
-    | FnDecl(pub: VISIBILITY, fun: Fn)
+    | FnDecl(pub: Visibility, fun: Fn)
   {
     function ToString(ind: string): string {
       if FnDecl? then
@@ -186,17 +319,15 @@ module RAST {
       else assert RawImplMember?; content
     }
   }
-  newtype VISIBILITY = x: int | 0 <= x < 2
-  const PUB := 1 as VISIBILITY
-  const PRIV := 0 as VISIBILITY
+  datatype Visibility = PUB | PRIV
 
   datatype Formal =
     Formal(name: string, tpe: Type)
   {
     function ToString(ind: string): string {
       if name == "self" && tpe.SelfOwned? then name
-      else if name == "&self" && tpe.Self? then name
-      else if name == "&mut self" && tpe.SelfMut? then name
+      else if name == "&self" && tpe == Borrowed(SelfOwned) then name
+      else if name == "&mut self" && tpe == Borrowed(SelfMut) then name
       else
         name + ": " + tpe.ToString(ind)
     }
@@ -216,7 +347,12 @@ module RAST {
   datatype MatchCase =
     MatchCase(pattern: Pattern, rhs: Expr)
   {
-    function ToString(ind: string): string {
+    ghost function Height(): nat {
+      1 + rhs.Height()
+    }
+    function ToString(ind: string): string
+      decreases Height()
+    {
       var newIndent := if rhs.Block? then ind else ind + IND;
       var rhsString := rhs.ToString(newIndent);
 
@@ -229,7 +365,13 @@ module RAST {
   datatype AssignIdentifier =
     AssignIdentifier(identifier: string, rhs: Expr)
   {
-    function ToString(ind: string): string {
+    ghost function Height(): nat {
+      1 + rhs.Height()
+    }
+
+    function ToString(ind: string): string
+      decreases Height()
+    {
       identifier + ": " + rhs.ToString(ind + IND)
     }
   }
@@ -247,37 +389,470 @@ module RAST {
       [raw[0]] + AddIndent(raw[1..], ind)
   }
 
+  function max(i: nat, j: nat): nat {
+    if i < j then j else i
+  }
+
+  datatype DeclareType = MUT | CONST
+
+  datatype Associativity = LeftToRight | RightToLeft | RequiresParentheses
+  datatype PrintingInfo =
+    | UnknownPrecedence()
+    | Precedence(precedence: nat)
+    | SuffixPrecedence(precedence: nat)
+    | PrecedenceAssociativity(precedence: nat, associativity: Associativity)
+  {
+    predicate NeedParenthesesFor(underlying: PrintingInfo) {
+      if UnknownPrecedence? then true
+      else if underlying.UnknownPrecedence? then true
+      else if precedence <= underlying.precedence then true
+      else false
+    }
+    predicate NeedParenthesesForLeft(underlying: PrintingInfo) {
+      if UnknownPrecedence? then true
+      else if underlying.UnknownPrecedence? then true
+      else if precedence <= underlying.precedence then
+        precedence < underlying.precedence || !PrecedenceAssociativity? || !associativity.LeftToRight?
+      else false
+    }
+    predicate NeedParenthesesForRight(underlying: PrintingInfo) {
+      if UnknownPrecedence? then true
+      else if underlying.UnknownPrecedence? then true
+      else if precedence <= underlying.precedence then
+        precedence < underlying.precedence || !PrecedenceAssociativity? || !associativity.RightToLeft?
+      else false
+    }
+    lemma Tests()
+      ensures PrecedenceAssociativity(20, LeftToRight)
+              .NeedParenthesesForLeft(PrecedenceAssociativity(20, LeftToRight)) == false
+      ensures PrecedenceAssociativity(20, LeftToRight)
+              .NeedParenthesesForRight(PrecedenceAssociativity(20, LeftToRight)) == true
+      ensures PrecedenceAssociativity(20, RightToLeft)
+              .NeedParenthesesForRight(PrecedenceAssociativity(20, RightToLeft)) == false
+      ensures PrecedenceAssociativity(20, RightToLeft)
+              .NeedParenthesesForLeft(PrecedenceAssociativity(20, RightToLeft)) == true
+      ensures PrecedenceAssociativity(20, LeftToRight)
+              .NeedParenthesesForLeft(PrecedenceAssociativity(30, LeftToRight)) == true
+      ensures PrecedenceAssociativity(20, RightToLeft)
+              .NeedParenthesesForRight(PrecedenceAssociativity(30, RightToLeft)) == true
+    {
+    }
+  }
+
+
   datatype Expr =
       RawExpr(content: string)
+    | Identifier(name: string) // Can be empty for global in MemberSelect
     | Match(matchee: Expr, cases: seq<MatchCase>)
     | StmtExpr(stmt: Expr, rhs: Expr)
     | Block(underlying: Expr)
     | StructBuild(name: string, assignments: seq<AssignIdentifier>)
+    | Tuple(arguments: seq<Expr>)
+    | UnaryOp(op1: string, underlying: Expr, format: Format.UnaryOpFormat)
+    | BinaryOp(op2: string, left: Expr, right: Expr, format2: Format.BinaryOpFormat)
+    | TypeAscription(left: Expr, tpe: Type)
+    | LiteralInt(value: string)
+    | LiteralString(value: string, binary: bool)
+    | ConversionNum(tpe: Type, underlying: Expr)
+    | DeclareVar(declareType: DeclareType, name: string, optType: Option<Type>, optRhs: Option<Expr>)
+    | AssignVar(name: string, rhs: Expr)
+    | IfExpr(cond: Expr, thn: Expr, els: Expr)
+    | Loop(optCond: Option<Expr>, underlying: Expr)
+    | For(name: string, range: Expr, body: Expr)
+    | Labelled(lbl: string, underlying: Expr)
+    | Break(optLbl: Option<string>)
+    | Continue(optLbl: Option<string>)
+    | Return(optExpr: Option<Expr>)
+    | Call(obj: Expr, typeParameters: seq<Type>, arguments: seq<Expr>)
+    | Select(obj: Expr, name: string)
+    | MemberSelect(obj: Expr, name: string)
   {
-    function ToString(ind: string): string {
-      if Match? then
-        "match " + matchee.ToString(ind + IND) + " {" +
-        SeqToString(cases, (c: MatchCase) requires c < this =>
-                      "\n" + ind + IND + c.ToString(ind + IND), ",") +
-        "\n" + ind + "}"
-      else if StmtExpr? then
-        stmt.ToString(ind) + ";\n" + ind + rhs.ToString(ind)
-      else if Block? then
-        "{\n" + ind + IND + underlying.ToString(ind + IND) + "\n" + ind + "}"
-      else if StructBuild? then
-        name + " {" +
-        SeqToString(assignments, (assignment: AssignIdentifier)
-                    requires assignment < this
-                    =>
-                      "\n" + ind + IND + assignment.ToString(ind + IND), ",") +
-        (if |assignments| > 0 then "\n" + ind else "") + "}"
-      else assert RawExpr?; AddIndent(content, ind)
+    predicate NoExtraSemicolonAfter() {
+      DeclareVar? || AssignVar? || Break? || Continue? || Return? ||
+      (RawExpr? && |content| > 0 && content[|content| - 1] == ';')
+    }
+    // Taken from https://doc.rust-lang.org/reference/expressions.html
+    const printingInfo: PrintingInfo :=
+      match this {
+        case RawExpr(_) => UnknownPrecedence()
+        case Identifier(_) => Precedence(1)
+        case LiteralInt(_) => Precedence(1)
+        case LiteralString(_, _) => Precedence(1)
+        // Paths => Precedence(1)
+        // Method call => Precedence(2)
+        // Field expression => PrecedenceAssociativity(3, LeftToRight)
+        // case function call | ArrayIndexing => Precedence(4)
+        case UnaryOp(op, underlying, format) =>
+          match op {
+            case "?" => SuffixPrecedence(5)
+            case "-" | "*" | "!" | "&" | "&mut" => Precedence(6)
+            case _ => UnknownPrecedence()
+          }
+        case Select(underlying, name) => PrecedenceAssociativity(2, LeftToRight)
+        case MemberSelect(underlying, name) => PrecedenceAssociativity(2, LeftToRight)
+        case Call(_, _, _) => PrecedenceAssociativity(2, LeftToRight)
+        case TypeAscription(left, tpe) =>
+          PrecedenceAssociativity(10, LeftToRight)
+        case BinaryOp(op2, left, right, format) =>
+          match op2 {
+            case "*" | "/" | "%" => PrecedenceAssociativity(20, LeftToRight)
+            case "+" | "-" => PrecedenceAssociativity(30, LeftToRight)
+            case "<<" | ">>" => PrecedenceAssociativity(40, LeftToRight)
+            case "&" => PrecedenceAssociativity(50, LeftToRight)
+            case "^" => PrecedenceAssociativity(60, LeftToRight)
+            case "|" => PrecedenceAssociativity(70, LeftToRight)
+            case "==" | "!=" | "<" | ">" | "<=" | ">=" => PrecedenceAssociativity(80, RequiresParentheses)
+            case "&&" => PrecedenceAssociativity(90, LeftToRight)
+            case "||" => PrecedenceAssociativity(100, LeftToRight)
+            case ".." | "..=" => PrecedenceAssociativity(110, RequiresParentheses)
+            case "=" | "+=" | "-=" | "*=" | "/=" | "%=" | "&=" | "|=" | "^=" | "<<=" | ">>=" =>
+              PrecedenceAssociativity(110, RightToLeft)
+            case _ => PrecedenceAssociativity(0, RequiresParentheses)
+          }
+        case _ => UnknownPrecedence()
+      }
+
+    ghost function Height(): nat {
+      match this {
+        case Identifier(_) => 1
+        case LiteralInt(_) => 1
+        case LiteralString(_, _) => 1
+        case ConversionNum(_, underlying) => 1 + underlying.Height()
+        case Match(matchee, cases) =>
+          1 + max(matchee.Height(),
+                  SeqToHeight(cases, (oneCase: MatchCase)
+                              requires oneCase < this
+                              => oneCase.Height()))
+        case StmtExpr(stmt, rhs) =>
+          var default := 1 + max(stmt.Height(), rhs.Height());
+          match this {
+            case StmtExpr(DeclareVar(mod, name, Some(tpe), None), StmtExpr(AssignVar(name2, rhs), last)) =>
+              if name == name2 then
+                1 + default
+              else default
+            case _ => default
+          }
+
+        case Block(underlying) =>
+          1 + underlying.Height()
+        case StructBuild(name, assignments) =>
+          1 + SeqToHeight(assignments, (assignment: AssignIdentifier)
+                          requires assignment < this
+                          => assignment.Height())
+        case Tuple(arguments) =>
+          1 + SeqToHeight(arguments, (argument: Expr)
+                          requires argument < this
+                          => argument.Height())
+        // Special cases
+        case UnaryOp(_, underlying, _) => 1 + underlying.Height()
+        case TypeAscription(left, tpe) => 1 + left.Height()
+        case BinaryOp(op, left, right, format) =>
+          1 + max(left.Height(), right.Height())
+        case IfExpr(cond, thn, els) =>
+          1 + max(cond.Height(), max(thn.Height(), els.Height()))
+        case DeclareVar(declareType, name, tpe, expr) =>
+          1 + (match expr {
+                 case Some(e) => e.Height()
+                 case None => 0
+               })
+        case AssignVar(name, expr) =>
+          1 + expr.Height()
+        case Loop(optCond, underlying) =>
+          1 + if optCond.Some? then max(optCond.value.Height(), underlying.Height()) else underlying.Height()
+        case Labelled(lbl, underlying) =>
+          1 + underlying.Height()
+        case Break(_) => 1
+        case Continue(_) => 1
+        case For(name, range, body) =>
+          1 + max(range.Height(), body.Height())
+        case Return(optExpr) =>
+          if optExpr.Some? then 1 + optExpr.value.Height() else 1
+        case Call(obj, tpes, args) =>
+          1 + max(obj.Height(),
+                  max(SeqToHeight(tpes, (tpe: Type) requires tpe < this => 1),
+                      SeqToHeight(args, (arg: Expr) requires arg < this => arg.Height())))
+        case Select(expression, name) =>
+          1 + expression.Height()
+        case MemberSelect(expression, name) =>
+          1 + expression.Height()
+        case _ =>
+          assert RawExpr?;
+          1
+      }
+    }
+
+    // Wish: Prove that Optimize() preserves semantics, if any
+    // TODO: Ensure that even without Optimize(), tests pass
+    opaque function Optimize(): (r: Expr)
+      ensures this == r || r.Height() < this.Height()
+    {
+      match this {
+        case UnaryOp("&", Call(Select(underlying, "clone"), typeArgs, args), format) =>
+          if typeArgs == [] && args == [] then
+            assert Select(underlying, "clone").Height() == 1 + underlying.Height();
+            assert Call(Select(underlying, "clone"), typeArgs, args).Height() == 2 + underlying.Height();
+            assert UnaryOp("&", underlying, format).Height() == 1 + underlying.Height();
+            UnaryOp("&", underlying, format)
+          else
+            this
+
+        case UnaryOp("!", BinaryOp("==", left, right, format),
+          CombineFormat()) =>
+          assert BinaryOp("==", left, right, format).Height()
+              == BinaryOp("!=", left, right, BinaryOpFormat.NoFormat()).Height();
+          BinaryOp("!=", left, right, BinaryOpFormat.NoFormat())
+
+        case UnaryOp("!", BinaryOp("<", left, right, NoFormat()),
+          CombineFormat()) =>
+          assert BinaryOp(">=", left, right, BinaryOpFormat.NoFormat()).Height()
+              == BinaryOp("<", left, right, BinaryOpFormat.NoFormat()).Height();
+          BinaryOp(">=", left, right, BinaryOpFormat.NoFormat())
+
+        case UnaryOp("!", BinaryOp("<", left, right, ReverseFormat()),
+          CombineFormat()) =>
+          assert BinaryOp("<=", right, left, BinaryOpFormat.NoFormat()).Height()
+              == BinaryOp("<", left, right, BinaryOpFormat.ReverseFormat()).Height();
+          BinaryOp("<=", right, left, BinaryOpFormat.NoFormat())
+
+        case ConversionNum(tpe, expr) =>
+          if || tpe.U8? || tpe.U16? || tpe.U32? || tpe.U64? || tpe.U128?
+             || tpe.I8? || tpe.I16? || tpe.I32? || tpe.I64? || tpe.I128? then
+            match expr {
+              case Call(MemberSelect(
+                MemberSelect(MemberSelect(
+                Identifier(""), "dafny_runtime"), "DafnyInt"), "from"), tpe, args) =>
+                if |tpe| == 0 && |args| == 1 then
+                  match args[0] {
+                    case LiteralInt(number) => LiteralInt("/*optimized*/"+number)
+                    case LiteralString(number, _) => LiteralInt("/*optimized*/"+number)
+                    case _ => this
+                  }
+                else this
+              case _ => this
+            }
+          else
+            this
+        case StmtExpr(DeclareVar(mod, name, Some(tpe), None), StmtExpr(AssignVar(name2, rhs), last)) =>
+          if name == name2 then
+            var rewriting := StmtExpr(DeclareVar(mod, name, Some(tpe), Some(rhs)), last);
+            assert rewriting.Height() < this.Height() by {
+              assert StmtExpr(AssignVar(name2, rhs), last).Height() ==
+                     1 + max(AssignVar(name2, rhs).Height(), last.Height()) ==
+                     1 + max(1 + rhs.Height(), last.Height());
+              assert this.Height() == 2 + max(1, 1 + max(1 + rhs.Height(), last.Height()));
+              assert rewriting.Height() == 1 + max(1 + rhs.Height(), last.Height());
+            }
+            rewriting
+          else
+            this
+        case _ => this
+      }
+    }
+
+    predicate LeftRequiresParentheses(left: Expr) {
+      printingInfo.NeedParenthesesForLeft(left.printingInfo)
+    }
+    function LeftParentheses(left: Expr): (string, string) {
+      if LeftRequiresParentheses(left) then
+        ("(", ")")
+      else
+        ("", "")
+    }
+
+    predicate RightRequiresParentheses(right: Expr) {
+      printingInfo.NeedParenthesesForRight(right.printingInfo)
+    }
+
+
+    function RightParentheses(right: Expr): (string, string) {
+      if RightRequiresParentheses(right) then
+        ("(", ")")
+      else
+        ("", "")
+    }
+
+    function RightMostIdentifier(): Option<string> {
+      match this {
+        case MemberSelect(_, id) => Some(id)
+        case _ => None
+      }
+    }
+
+    function ToString(ind: string): string
+      decreases Height()
+    {
+      match this.Optimize() {
+        case Identifier(name) => name
+        case LiteralInt(number) => number
+        case LiteralString(characters, binary) =>
+          (if binary then "b" else "") +
+          "\"" + characters + "\""
+        case ConversionNum(tpe, expr) =>
+          if || tpe.U8? || tpe.U16? || tpe.U32? || tpe.U64? || tpe.U128?
+             || tpe.I8? || tpe.I16? || tpe.I32? || tpe.I64? || tpe.I128? then
+            "num::ToPrimitive::to_"+tpe.ToString(ind)+"(" + expr.ToString(ind) + ").unwrap()"
+          else
+            "<b>Unsupported: Numeric conversion to " + tpe.ToString(ind) + "</b>"
+        case Match(matchee, cases) =>
+          "match " + matchee.ToString(ind + IND) + " {" +
+          SeqToString(cases,
+                      (c: MatchCase) requires c.Height() < this.Height() =>
+                        "\n" + ind + IND + c.ToString(ind + IND), ",") +
+          "\n" + ind + "}"
+        case StmtExpr(stmt, rhs) => // They are built like StmtExpr(StmtExpr(StmtExpr(..., 1), 2), 3...)
+          if stmt.RawExpr? && stmt.content == "" then rhs.ToString(ind) else
+          stmt.ToString(ind) + (if stmt.NoExtraSemicolonAfter() then "" else ";") +
+          "\n" + ind + rhs.ToString(ind)
+        case Block(underlying) =>
+          "{\n" + ind + IND + underlying.ToString(ind + IND) + "\n" + ind + "}"
+        case IfExpr(cond, thn, els) =>
+          "if " + cond.ToString(ind + IND) + " {\n" + ind + IND + thn.ToString(ind + IND) +
+          "\n" + ind + "} else {\n" + ind + IND + els.ToString(ind + IND) + "\n" + ind + "}"
+        case StructBuild(name, assignments) =>
+          name + " {" +
+          SeqToString(assignments, (assignment: AssignIdentifier)
+                      requires assignment.Height() < this.Height()
+                      =>
+                        "\n" + ind + IND + assignment.ToString(ind + IND), ",") +
+          (if |assignments| > 0 then "\n" + ind else "") + "}"
+        case Tuple(arguments) =>
+          "(" +
+          SeqToString(arguments, (arg: Expr)
+                      requires arg.Height() < this.Height()
+                      =>
+                        "\n" + ind + IND + arg.ToString(ind + IND), ",") +
+          (if |arguments| > 0 then "\n" + ind else "") + ")"
+
+        case UnaryOp(op, underlying, format) =>
+          var (leftP, rightP) :=
+            if printingInfo.NeedParenthesesFor(underlying.printingInfo) then
+              ("(", ")")
+            else
+              ("", "");
+          var leftOp := if op == "&mut" && leftP != "(" then op + " " else if op == "?" then "" else op;
+          var rightOp := if op == "?" then op else "";
+
+          leftOp + leftP  + underlying.ToString(ind) + rightP + rightOp
+        case TypeAscription(left, tpe) =>
+          var (leftLeftP, leftRightP) := LeftParentheses(left);
+          leftLeftP + left.ToString(IND) + leftRightP + " as " + tpe.ToString(IND)
+        case BinaryOp(op2, left, right, format) =>
+          var (leftLeftP, leftRighP) := LeftParentheses(left);
+          var (rightLeftP, rightRightP) := RightParentheses(right);
+          var opRendered := " " + op2 + " ";
+          var indLeft := if leftLeftP == "(" then ind + IND else ind;
+          var indRight := if rightLeftP == "(" then ind + IND else ind;
+          leftLeftP + left.ToString(indLeft) + leftRighP + opRendered + rightLeftP + right.ToString(indRight) + rightRightP
+        case DeclareVar(declareType, name, optType, optExpr) =>
+          "let " + (if declareType == MUT then "mut " else "") +
+          name + (if optType.Some? then ": " + optType.value.ToString(ind + IND) else "") +
+
+          (if optExpr.Some? then
+             var optExprString := optExpr.value.ToString(ind + IND);
+             if optExprString == "" then
+               "= /*issue with empty RHS*/" +
+               if optExpr.value.RawExpr? then "Empty Raw expr" else
+               if optExpr.value.LiteralString? then "Empty string literal" else
+               if optExpr.value.LiteralInt? then "Empty int literal" else
+               "Another case"
+             else " = " + optExprString else "") + ";"
+        case AssignVar(name, expr) =>
+          name + " = " + expr.ToString(ind + IND) + ";"
+        case Labelled(name, underlying) =>
+          "'" + name + ": " + underlying.ToString(ind)
+        case Break(optLbl) =>
+          match optLbl {
+            case Some(lbl) => "break '" + lbl + ";"
+            case None => "break;"
+          }
+        case Continue(optLbl) =>
+          match optLbl {
+            case Some(lbl) => "continue '" + lbl + ";"
+            case None => "continue;"
+          }
+        case Loop(optCond, underlying) =>
+          (match optCond {
+             case None => "loop"
+             case Some(c) => "while " + c.ToString(ind + IND)
+           }) + " {\n" + ind + IND + underlying.ToString(ind + IND) + "\n" + ind + "}"
+        case For(name, range, body) =>
+          "for "+ name +" in " + range.ToString(ind + IND) + " {\n" + ind + IND +
+          body.ToString(ind + IND) + "\n" + ind + "}"
+        case Return(optExpr) =>
+          "return" + (if optExpr.Some? then " " + optExpr.value.ToString(ind + IND) else "") + ";"
+        case Call(expr, tpes, args) =>
+          var (leftP, rightP) := LeftParentheses(expr);
+          var (leftCallP, rightCallP) := match expr.RightMostIdentifier() {
+            case Some("seq!") | Some("map!")  =>
+              ("[","]")
+            case Some("set!") | Some("multiset!") =>
+              ("{","}")
+            case _ =>
+              ("(", ")")
+          };
+          leftP + expr.ToString(ind) + rightP + (
+            if |tpes| == 0 then ""
+            else
+              "::<" + SeqToString(tpes, (tpe: Type) => tpe.ToString(ind + IND), ", ") +">"
+          ) + leftCallP + SeqToString(args, (arg: Expr) requires arg.Height() < this.Height() => arg.ToString(ind + IND), ", ")+ rightCallP
+        case Select(expression, name) =>
+          var (leftP, rightP) := LeftParentheses(expression);
+          leftP + expression.ToString(ind) + rightP + "." + name
+        case MemberSelect(expression, name) =>
+          var (leftP, rightP) := LeftParentheses(expression);
+          leftP + expression.ToString(ind) + rightP + "::" + name
+        case r =>
+          assert r.RawExpr?; AddIndent(r.content, ind)
+      }
     }
     function Then(rhs2: Expr): Expr {
-      StmtExpr(this, rhs2)
+      if this.StmtExpr? then
+        StmtExpr(stmt, rhs.Then(rhs2))
+      else
+        StmtExpr(this, rhs2)
+    }
+
+    // Helpers
+
+    function Sel(name: string): Expr {
+      Select(this, name)
+    }
+    function MSel(name: string): Expr {
+      MemberSelect(this, name)
+    }
+
+    function Apply(typeParameters: seq<Type>, arguments: seq<Expr>): Expr {
+      Call(this, typeParameters, arguments)
+    }
+
+    function Apply1(argument: Expr): Expr {
+      Call(this, [], [argument])
     }
   }
 
+  const global := Identifier("")
+
+  const dafny_runtime := global.MSel("dafny_runtime")
+  const dafny_runtime_Set := dafny_runtime.MSel("Set")
+  const dafny_runtime_Set_from_array := dafny_runtime_Set.MSel("from_array")
+  const dafny_runtime_Sequence := dafny_runtime.MSel("Sequence")
+  const Sequence_from_array_owned := dafny_runtime_Sequence.MSel("from_array_owned")
+  const Sequence_from_array := dafny_runtime_Sequence.MSel("from_array")
+  const dafny_runtime_Multiset := dafny_runtime.MSel("Multiset")
+  const dafny_runtime_Multiset_from_array := dafny_runtime_Multiset.MSel("from_array")
+
+  const std := global.MSel("std")
+
+  const std_rc := std.MSel("rc")
+
+  const std_rc_Rc := std_rc.MSel("Rc")
+
+  const std_rc_Rc_new := std_rc_Rc.MSel("new")
+
+  function RcNew(underlying: Expr): Expr {
+    Call(std_rc_Rc_new, [], [underlying])
+  }
+
   datatype Fn =
     Fn(name: string, typeParams: seq<TypeParam>, formals: seq<Formal>,
        returnType: Option<Type>,
@@ -300,20 +875,16 @@ module RAST {
   }
 }
 
-module {:extern "DCOMP"} DCOMP {
+module {:extern "DCOMP"} DafnyToRustCompiler {
   import opened DAST
   import Strings = Std.Strings
+  import Std
   import opened Std.Wrappers
   import R = RAST
   const IND := R.IND
   type Type = DAST.Type
   type Formal = DAST.Formal
 
-  function runtime(suffix: string): string {
-    "::dafny_runtime" + suffix
-  }
-  const DafnyErasable := runtime("::DafnyErasable")
-
   // List taken from https://doc.rust-lang.org/book/appendix-01-keywords.html
   const reserved_rust := {
     "as","async","await","break","const","continue",
@@ -365,7 +936,9 @@ module {:extern "DCOMP"} DCOMP {
       [i[0]] + replaceDots(i[1..])
   }
 
-  predicate is_tuple_builder(i: string) {
+  predicate is_tuple_builder(i: string)
+    // A tuple builder identifier looks like ___hMake0 to ___hMake99
+  {
     && |i| >= 9
     && i[..8] == "___hMake"
     && i[8] in "0123456789"
@@ -383,7 +956,7 @@ module {:extern "DCOMP"} DCOMP {
     && (|i| >= 2 ==> i[1] != 'T') // To avoid conflict with tuple builders _T<digits>
   }
 
-  predicate is_idiomatic_rust(i: string) {
+  predicate is_idiomatic_rust_id(i: string) {
     0 < |i| && !has_special(i) && i !in reserved_rust
   }
 
@@ -394,7 +967,7 @@ module {:extern "DCOMP"} DCOMP {
       better_tuple_builder_name(i)
     else if i in reserved_rust then
       "r#" + i
-    else if is_idiomatic_rust(i) then
+    else if is_idiomatic_rust_id(i) then
       idiomatic_rust(i)
     else if is_dafny_generated_id(i) then
       i // Dafny-generated identifiers like "_module", cannot be written in Dafny itself
@@ -403,8 +976,17 @@ module {:extern "DCOMP"} DCOMP {
       "r#_" + r
   }
 
+  datatype Ownership = OwnershipOwned | OwnershipBorrowed | OwnershipBorrowedMut | OwnershipAutoBorrowed
+
+
   class COMP {
-    static method GenModule(mod: Module, containingPath: seq<Ident>) returns (s: R.Mod) {
+    const DafnyChar := if UnicodeChars then "DafnyChar" else "DafnyCharUTF16"
+    const UnicodeChars: bool
+
+    constructor(UnicodeChars: bool) {
+      this.UnicodeChars := UnicodeChars;
+    }
+    method GenModule(mod: Module, containingPath: seq<Ident>) returns (s: R.Mod) {
       var body := GenModuleBody(mod.body, containingPath + [Ident.Ident(mod.name)]);
 
       s := if mod.isExtern then
@@ -413,7 +995,7 @@ module {:extern "DCOMP"} DCOMP {
         R.Mod(escapeIdent(mod.name), body);
     }
 
-    static method GenModuleBody(body: seq<ModuleItem>, containingPath: seq<Ident>) returns (s: seq<R.ModDecl>) {
+    method GenModuleBody(body: seq<ModuleItem>, containingPath: seq<Ident>) returns (s: seq<R.ModDecl>) {
       s := [];
       var i := 0;
       while i < |body| {
@@ -437,49 +1019,36 @@ module {:extern "DCOMP"} DCOMP {
       }
     }
 
-    static method GenTypeParameters(params: seq<Type>)
+    method GenTypeParameters(params: seq<Type>)
       returns (
         typeParamsSet: set<Type>,
         typeParams: seq<R.TypeParam>,
         constrainedTypeParams: seq<R.TypeParam>,
-        whereConstraints: string,
-        constrainedEraseParams: seq<R.TypeParam>,
-        unerasedParams: string,
-        erasedParams: string)
+        whereConstraints: string)
     {
       typeParamsSet := {};
       typeParams := [];
       constrainedTypeParams := [];
       whereConstraints := "";
-      constrainedEraseParams := [];
-      unerasedParams := "";
-      erasedParams := "";
       var tpI := 0;
 
       if |params| > 0 {
-        whereConstraints := " where ";
-        unerasedParams := "<";
-        erasedParams := "<";
         while tpI < |params| {
           var tp := params[tpI];
           typeParamsSet := typeParamsSet + {tp};
           var genTp := GenType(tp, false, false);
-          typeParams := typeParams + [R.RawTypeParam(genTp)];
-          var baseConstraints := ": ::dafny_runtime::DafnyErasable + ::dafny_runtime::DafnyUnerasable<" + genTp + "> + Clone + ::dafny_runtime::DafnyPrint + ::std::default::Default";
-          constrainedTypeParams := constrainedTypeParams + [R.RawTypeParam(genTp + baseConstraints + " + 'static")];
-          whereConstraints := whereConstraints + "<" + genTp + " as ::dafny_runtime::DafnyErasable>::Erased: ::std::cmp::PartialEq" + ", ";
-          constrainedEraseParams := constrainedEraseParams + [R.RawTypeParam(genTp + "__Erased" + ", " + genTp + baseConstraints + " + ::dafny_runtime::DafnyUnerasable<" + genTp + "__Erased> + 'static")];
-          unerasedParams := unerasedParams + genTp + "__Erased" + ", ";
-          erasedParams := erasedParams + genTp + "::Erased" + ", ";
+          typeParams := typeParams + [R.RawTypeParam(genTp.ToString(IND), [])];
           tpI := tpI + 1;
         }
-        unerasedParams := unerasedParams + ">";
-        erasedParams := erasedParams + ">";
       }
+      var baseConstraints := [R.CloneTrait, R.DafnyPrintTrait, R.StaticTrait];
+      constrainedTypeParams := R.TypeParam.AddConstraintsMultiple(
+        typeParams, baseConstraints
+      );
     }
 
-    static method GenClass(c: Class, path: seq<Ident>) returns (s: seq<R.ModDecl>) {
-      var typeParamsSet, sTypeParams, sConstrainedTypeParams, whereConstraints, constrainedEraseParams, unerasedParams, erasedParams := GenTypeParameters(c.typeParams);
+    method GenClass(c: Class, path: seq<Ident>) returns (s: seq<R.ModDecl>) {
+      var typeParamsSet, sTypeParams, sConstrainedTypeParams, whereConstraints := GenTypeParameters(c.typeParams);
       var constrainedTypeParams := R.TypeParam.ToStringMultiple(sConstrainedTypeParams, R.IND + R.IND);
 
       var fields: seq<R.Formal> := [];
@@ -488,15 +1057,15 @@ module {:extern "DCOMP"} DCOMP {
       while fieldI < |c.fields| {
         var field := c.fields[fieldI];
         var fieldType := GenType(field.formal.typ, false, false);
-        fields := fields + [R.Formal("pub " + escapeIdent(field.formal.name), R.RawType("::std::cell::RefCell<" + fieldType + ">"))];
+        fields := fields + [R.Formal("pub " + escapeIdent(field.formal.name), R.TypeApp(R.refcell_type, [fieldType]))];
 
         match field.defaultValue {
           case Some(e) => {
-            var eStr, _, _, _ := GenExpr(e, None, [], true);
+            var eStr, _, _ := GenExpr(e, None, [], OwnershipOwned);
             fieldInits := fieldInits + [
               R.AssignIdentifier(
                 escapeIdent(field.formal.name),
-                R.RawExpr("::std::cell::RefCell::new(" + eStr + ")"))];
+                R.RawExpr("::std::cell::RefCell::new(" + eStr.ToString(IND) + ")"))];
           }
           case None => {
             fieldInits := fieldInits + [
@@ -512,7 +1081,7 @@ module {:extern "DCOMP"} DCOMP {
       var typeParamI := 0;
       while typeParamI < |c.typeParams| {
         var tpeGen := GenType(c.typeParams[typeParamI], false, false);
-        fields := fields + [R.Formal("_phantom_type_param_" + Strings.OfNat(typeParamI), R.RawType("::std::marker::PhantomData<" + tpeGen + ">"))];
+        fields := fields + [R.Formal("_phantom_type_param_" + Strings.OfNat(typeParamI), R.TypeApp(R.std_type.MSel("marker").MSel("PhantomData"), [tpeGen]))];
         fieldInits := fieldInits + [
           R.AssignIdentifier(
             "_phantom_type_param_" + Strings.OfNat(typeParamI),
@@ -522,7 +1091,8 @@ module {:extern "DCOMP"} DCOMP {
       }
 
       var struct := R.Struct([], escapeIdent(c.name), sTypeParams, R.NamedFormals(fields));
-      var typeParams := R.TypeParam.ToStringMultiple(sTypeParams, R.IND + R.IND);
+      var typeParamsAsTypes :=
+        Std.Collections.Seq.Map((typeParam: R.TypeParam) => R.RawType(typeParam.content), sTypeParams);
 
       s := [R.StructDecl(struct)];
 
@@ -542,7 +1112,7 @@ module {:extern "DCOMP"} DCOMP {
 
       var i := R.Impl(
         sConstrainedTypeParams,
-        R.RawType(escapeIdent(c.name) + typeParams),
+        R.TypeApp(R.TIdentifier(escapeIdent(c.name)), typeParamsAsTypes),
         whereConstraints,
         implBody
       );
@@ -564,8 +1134,8 @@ module {:extern "DCOMP"} DCOMP {
               var x := R.ImplDecl(
                 R.ImplFor(
                   sConstrainedTypeParams,
-                  R.RawType(pathStr + typeArgs),
-                  R.RawType("::std::rc::Rc<" + genSelfPath + typeParams + ">"),
+                  R.TypeApp(R.TIdentifier(pathStr), typeArgs),
+                  R.Rc(R.TypeApp(R.TIdentifier(genSelfPath), typeParamsAsTypes)),
                   whereConstraints,
                   body
                 ));
@@ -579,8 +1149,8 @@ module {:extern "DCOMP"} DCOMP {
 
       var d := R.ImplFor(
         sConstrainedTypeParams,
-        R.RawType("::std::default::Default"),
-        R.RawType(escapeIdent(c.name) + typeParams),
+        R.DefaultTrait,
+        R.TypeApp(R.TIdentifier(escapeIdent(c.name)), typeParamsAsTypes),
         whereConstraints,
         [R.FnDecl(
            R.PRIV,
@@ -594,8 +1164,8 @@ module {:extern "DCOMP"} DCOMP {
       var p :=
         R.ImplFor(
           sConstrainedTypeParams,
-          R.RawType("::dafny_runtime::DafnyPrint"),
-          R.RawType(escapeIdent(c.name) + typeParams),
+          R.DafnyPrintTrait,
+          R.TypeApp(R.TIdentifier(escapeIdent(c.name)), typeParamsAsTypes),
           "",
           [R.FnDecl(
              R.PRIV,
@@ -612,7 +1182,7 @@ module {:extern "DCOMP"} DCOMP {
       var pp := R.ImplFor(
         sTypeParams,
         R.RawType("::std::cmp::PartialEq"),
-        R.RawType(escapeIdent(c.name) + typeParams),
+        R.TypeApp(R.TIdentifier(escapeIdent(c.name)), typeParamsAsTypes),
         "",
         [R.FnDecl(
            R.PRIV,
@@ -626,96 +1196,65 @@ module {:extern "DCOMP"} DCOMP {
       );
       var ptrPartialEqImpl := [R.ImplDecl(pp)];
 
-      var ii := R.ImplDecl(R.ImplFor(
-                             sConstrainedTypeParams,
-                             R.RawType("::dafny_runtime::DafnyErasable"),
-                             R.RawType(escapeIdent(c.name) + typeParams),
-                             "",
-                             [R.RawImplMember("type Erased = " + escapeIdent(c.name) + erasedParams + ";")]
-                           ));
-      var u := R.ImplDecl(R.ImplFor(
-                            constrainedEraseParams,
-                            R.RawType("::dafny_runtime::DafnyUnerasable<" + escapeIdent(c.name) + unerasedParams + ">"),
-                            R.RawType(escapeIdent(c.name) + typeParams),
-                            "", []
-                          ));
-      var identEraseImpls := [ii, u];
-
-      s := s + defaultImpl + printImpl + ptrPartialEqImpl + identEraseImpls;
-    }
-
-    static method GenTrait(t: Trait, containingPath: seq<Ident>) returns (s: string) {
+      s := s + defaultImpl + printImpl + ptrPartialEqImpl;
+    }
+
+    method GenTrait(t: Trait, containingPath: seq<Ident>) returns (s: string) {
       var typeParamsSet := {};
-      var typeParams := "";
+      var typeParams := [];
       var tpI := 0;
       if |t.typeParams| > 0 {
-        typeParams := "<";
         while tpI < |t.typeParams| {
           var tp := t.typeParams[tpI];
           typeParamsSet := typeParamsSet + {tp};
           var genTp := GenType(tp, false, false);
-          typeParams := typeParams + genTp + ", ";
+          typeParams := typeParams + [genTp];
           tpI := tpI + 1;
         }
-        typeParams := typeParams + ">";
       }
 
       var fullPath := containingPath + [Ident.Ident(t.name)];
       var implBody, _ := GenClassImplBody(t.body, true, Type.Path(fullPath, [], ResolvedType.Trait(fullPath)), typeParamsSet);
       s :=
         R.TraitDecl(R.Trait(
-                      [], R.RawType(escapeIdent(t.name) + typeParams),
+                      [], R.TypeApp(R.TIdentifier(escapeIdent(t.name)), typeParams),
                       "",
                       implBody
                     )).ToString(IND);
     }
 
-    static method GenNewtype(c: Newtype) returns (s: seq<R.ModDecl>) {
-      var typeParamsSet, sTypeParams, sConstrainedTypeParams, whereConstraints, _, _, _ := GenTypeParameters(c.typeParams);
-      var typeParams := R.TypeParam.ToStringMultiple(sTypeParams, R.IND + R.IND);
+    method GenNewtype(c: Newtype) returns (s: seq<R.ModDecl>) {
+      var typeParamsSet, sTypeParams, sConstrainedTypeParams, whereConstraints := GenTypeParameters(c.typeParams);
+      var typeParamsAsTypes :=
+        Std.Collections.Seq.Map((t: R.TypeParam) => R.RawType(t.content), sTypeParams);
       var constrainedTypeParams := R.TypeParam.ToStringMultiple(sConstrainedTypeParams, R.IND + R.IND);
 
-      var underlyingType := GenType(c.base, false, false);
-      s := [R.StructDecl(
-              R.Struct(
-                [
-                  R.RawAttribute("#[derive(Clone, PartialEq)]"),
-                  R.RawAttribute("#[repr(transparent)]")
-                ],
-                escapeIdent(c.name),
-                sTypeParams,
-                R.NamelessFormals([R.RawType("pub " + underlyingType)])
-              ))];
-      s := s +
-      [R.ImplDecl(R.ImplFor(
-                    sConstrainedTypeParams,
-                    R.RawType("::dafny_runtime::DafnyErasable"),
-                    R.RawType(escapeIdent(c.name) + typeParams),
-                    "",
-                    [R.RawImplMember("type Erased = " + underlyingType + ";")]
-                  ))];
-      s := s +
-      [R.ImplDecl(
-         R.ImplFor(
-           sConstrainedTypeParams,
-           R.RawType("::dafny_runtime::DafnyUnerasable<" + underlyingType + ">"),
-           R.RawType(escapeIdent(c.name) + typeParams),
-           "", []))];
-      s := s +
-      [R.ImplDecl(
-         R.ImplFor(
-           sConstrainedTypeParams,
-           R.RawType("::dafny_runtime::DafnyUnerasable<" + escapeIdent(c.name) + typeParams + ">"),
-           R.RawType(escapeIdent(c.name) + typeParams),
-           "", []))];
+      var underlyingType;
+      match NewtypeToRustType(c.base, c.range) {
+        case Some(v) =>
+          underlyingType := v;
+        case None =>
+          underlyingType := GenType(c.base, false, false);
+      }
+      s := [
+        R.StructDecl(
+          R.Struct(
+            [
+              R.RawAttribute("#[derive(Clone, PartialEq)]"),
+              R.RawAttribute("#[repr(transparent)]")
+            ],
+            escapeIdent(c.name),
+            sTypeParams,
+            R.NamelessFormals([R.NamelessFormal(R.PUB, underlyingType)])
+          ))];
 
       var fnBody := "";
 
       match c.witnessExpr {
         case Some(e) => {
           // TODO(shadaj): generate statements
-          var eStr, _, _, _ := GenExpr(e, None, [], true);
-          fnBody := fnBody + escapeIdent(c.name) + "(" + eStr + ")\n";
+          var eStr, _, _ := GenExpr(e, None, [], OwnershipOwned);
+          fnBody := fnBody + escapeIdent(c.name) + "(" + eStr.ToString(IND) + ")\n";
         }
         case None => {
           fnBody := fnBody + escapeIdent(c.name) + "(::std::default::Default::default())";
@@ -734,15 +1273,15 @@ module {:extern "DCOMP"} DCOMP {
         R.ImplDecl(
           R.ImplFor(
             sConstrainedTypeParams,
-            R.RawType("::std::default::Default"),
-            R.RawType(escapeIdent(c.name) + typeParams),
+            R.DefaultTrait,
+            R.TypeApp(R.TIdentifier(escapeIdent(c.name)), typeParamsAsTypes),
             whereConstraints,
             [body]))];
       s := s + [
         R.ImplDecl(R.ImplFor(
                      sConstrainedTypeParams,
-                     R.RawType("::dafny_runtime::DafnyPrint"),
-                     R.RawType(escapeIdent(c.name) + typeParams),
+                     R.DafnyPrintTrait,
+                     R.TypeApp(R.TIdentifier(escapeIdent(c.name)), typeParamsAsTypes),
                      "",
                      [R.FnDecl(R.PRIV,
                                R.Fn("fmt_print", [],
@@ -756,9 +1295,9 @@ module {:extern "DCOMP"} DCOMP {
           R.ImplFor(
             sConstrainedTypeParams,
             R.RawType("::std::ops::Deref"),
-            R.RawType(escapeIdent(c.name) + typeParams),
+            R.TypeApp(R.TIdentifier(escapeIdent(c.name)), typeParamsAsTypes),
             "",
-            [R.RawImplMember("type Target = " + underlyingType + ";"),
+            [R.RawImplMember("type Target = " + underlyingType.ToString(IND) + ";"),
              R.FnDecl(
                R.PRIV,
                R.Fn("deref", [],
@@ -767,11 +1306,11 @@ module {:extern "DCOMP"} DCOMP {
                     Some(R.RawExpr("&self.0"))))]))];
     }
 
-    static method GenDatatype(c: Datatype) returns (s: seq<R.ModDecl>) {
-      var typeParamsSet, sTypeParams, sConstrainedTypeParams, whereConstraints, sConstrainedEraseParams, unerasedParams, erasedParams := GenTypeParameters(c.typeParams);
-      var typeParams := R.TypeParam.ToStringMultiple(sTypeParams, IND + IND);
+    method GenDatatype(c: Datatype) returns (s: seq<R.ModDecl>) {
+      var typeParamsSet, sTypeParams, sConstrainedTypeParams, whereConstraints := GenTypeParameters(c.typeParams);
+      var typeParamsAsTypes :=
+        Std.Collections.Seq.Map((t: R.TypeParam) => R.RawType(t.content), sTypeParams);
       var constrainedTypeParams := R.TypeParam.ToStringMultiple(sConstrainedTypeParams, IND + IND);
-      var constrainedEraseParams := R.TypeParam.ToStringMultiple(sConstrainedEraseParams, IND);
 
       var ctors: seq<R.EnumCase> := [];
       var i := 0;
@@ -783,9 +1322,12 @@ module {:extern "DCOMP"} DCOMP {
           var formal := ctor.args[j];
           var formalType := GenType(formal.typ, false, false);
           if c.isCo {
-            ctorArgs := ctorArgs + [R.Formal(escapeIdent(formal.name), R.RawType("::dafny_runtime::LazyFieldWrapper<" + formalType + ">"))];
+            ctorArgs := ctorArgs + [
+              R.Formal(escapeIdent(formal.name),
+                       R.TypeApp(R.dafny_runtime_type.MSel("LazyFieldWrapper"), [formalType]))];
           } else {
-            ctorArgs := ctorArgs + [R.Formal(escapeIdent(formal.name), R.RawType(formalType))];
+            ctorArgs := ctorArgs + [
+              R.Formal(escapeIdent(formal.name), formalType)];
           }
           j := j + 1;
         }
@@ -860,7 +1402,7 @@ module {:extern "DCOMP"} DCOMP {
                 R.PUB,
                 R.Fn(
                   escapeIdent(formal.name),
-                  [], [R.Formal.self], Some(R.RawType("&" + formalType )),
+                  [], [R.Formal.self], Some(R.Borrowed(formalType)),
                   "",
                   Some(methodBody)
                 ))];
@@ -876,11 +1418,12 @@ module {:extern "DCOMP"} DCOMP {
         var types: seq<R.Type> := [];
         while typeI < |c.typeParams| {
           var genTp := GenType(c.typeParams[typeI], false, false);
-          types := types + [R.RawType("::std::marker::PhantomData::<" + genTp + ">")];
+          types := types + [R.TypeApp(R.TIdentifier("::std::marker::PhantomData::"), [genTp])];
           typeI := typeI + 1;
         }
         ctors := ctors + [R.EnumCase("_PhantomVariant",
-                                     R.NamelessFormals(types)
+                                     R.NamelessFormals(Std.Collections.Seq.Map(
+                                                         tpe => R.NamelessFormal(R.PRIV, tpe), types))
                           )];
       }
 
@@ -894,27 +1437,11 @@ module {:extern "DCOMP"} DCOMP {
          R.ImplDecl(
            R.Impl(
              sConstrainedTypeParams,
-             R.RawType(escapeIdent(c.name) + typeParams),
+             R.TypeApp(R.TIdentifier(escapeIdent(c.name)), typeParamsAsTypes),
              whereConstraints,
              implBody
            ))];
 
-      var identEraseImpls :=
-        [R.ImplDecl(
-           R.ImplFor(
-             sConstrainedTypeParams,
-             R.RawType("::dafny_runtime::DafnyErasable"),
-             R.RawType(escapeIdent(c.name) + typeParams),
-             "",
-             [R.RawImplMember("type Erased = " + escapeIdent(c.name) + erasedParams + ";")]
-           )),
-         R.ImplDecl(
-           R.ImplFor(
-             sConstrainedEraseParams,
-             R.RawType("::dafny_runtime::DafnyUnerasable<" + escapeIdent(c.name) + unerasedParams + ">"),
-             R.RawType(escapeIdent(c.name) + typeParams),
-             "", []))];
-
       i := 0;
       var printImplBodyCases: seq<R.MatchCase> := [];
       while i < |c.ctors| {
@@ -965,8 +1492,8 @@ module {:extern "DCOMP"} DCOMP {
         R.ImplDecl(
           R.ImplFor(
             sConstrainedTypeParams,
-            R.RawType("::dafny_runtime::DafnyPrint"),
-            R.RawType(escapeIdent(c.name) + typeParams),
+            R.DafnyPrintTrait,
+            R.TypeApp(R.TIdentifier(escapeIdent(c.name)), typeParamsAsTypes),
             "",
             [R.FnDecl(
                R.PRIV,
@@ -990,12 +1517,16 @@ module {:extern "DCOMP"} DCOMP {
           ];
           i := i + 1;
         }
+        var defaultConstrainedTypeParams := R.TypeParam.AddConstraintsMultiple(
+          sTypeParams, [R.DefaultTrait]
+        );
+
         defaultImpl := [
           R.ImplDecl(
             R.ImplFor(
-              sConstrainedTypeParams,
-              R.RawType("::std::default::Default"),
-              R.RawType(escapeIdent(c.name) + typeParams),
+              defaultConstrainedTypeParams,
+              R.DefaultTrait,
+              R.TypeApp(R.TIdentifier(escapeIdent(c.name)), typeParamsAsTypes),
               "",
               [R.FnDecl(
                  R.PRIV,
@@ -1009,7 +1540,7 @@ module {:extern "DCOMP"} DCOMP {
             ))];
       }
 
-      s := enumBody + identEraseImpls + printImpl + defaultImpl;
+      s := enumBody + printImpl + defaultImpl;
     }
 
     static method GenPath(p: seq<Ident>) returns (s: string) {
@@ -1031,129 +1562,146 @@ module {:extern "DCOMP"} DCOMP {
       }
     }
 
-    static method GenTypeArgs(args: seq<Type>, inBinding: bool, inFn: bool) returns (s: string) {
-      s := "";
+    method GenTypeArgs(args: seq<Type>, inBinding: bool, inFn: bool) returns (s: seq<R.Type>) {
+      s := [];
       if |args| > 0 {
-        s := s + "<";
         var i := 0;
         while i < |args| {
-          if i > 0 {
-            s := s + ", ";
-          }
-
           var genTp := GenType(args[i], inBinding, inFn);
-          s := s + genTp;
+          s := s + [genTp];
           i := i + 1;
         }
-        s := s + ">";
       }
     }
 
-    static method GenType(c: Type, inBinding: bool, inFn: bool) returns (s: string) {
+    method GenType(c: Type, inBinding: bool, inFn: bool) returns (s: R.Type) {
       match c {
-        case Path(p, args, resolved) =>
-          s := GenPath(p);
+        case Path(p, args, resolved) => {
+          var t := GenPath(p);
+          s := R.TIdentifier(t);
 
           var typeArgs := GenTypeArgs(args, inBinding, inFn);
-          s := s + typeArgs;
+          s := R.TypeApp(s, typeArgs);
 
           match resolved {
-            case Datatype(_) =>
-              s := "::std::rc::Rc<" + s + ">";
-            case Trait(_) =>
+            case Datatype(_) => {
+              s := R.Rc(s);
+            }
+            case Trait(_) => {
               if p == [Ident.Ident("_System"), Ident.Ident("object")] {
-                s := "::std::rc::Rc<dyn ::std::any::Any>";
+                s := R.RawType("::std::rc::Rc<dyn ::std::any::Any>");
               } else {
                 if inBinding {
                   // impl trait in bindings is not stable
-                  s := "_";
+                  s := R.RawType("_");
                 } else {
-                  s := "impl " + s + "";
+                  s := R.ImplType(s);
                 }
               }
-            case Primitive =>
-          }
-
-        case Nullable(inner) =>
-          var innerStr := GenType(inner, inBinding, inFn);
-          s := "::std::option::Option<" + innerStr + ">";
-
-        case Tuple(types) =>
-          s := "(";
-          for i := 0 to |types| {
-            if i > 0 {
-              s := s + " ";
             }
-
+            case Newtype(t, range, erased) => {
+              if erased {
+                match NewtypeToRustType(t, range) {
+                  case Some(v) =>
+                    s := v;
+                  case None =>
+                }
+              }
+            }
+          }
+        }
+        case Nullable(inner) => {
+          var innerExpr := GenType(inner, inBinding, inFn);
+          s := R.TypeApp(R.TIdentifier("::std::option::Option"), [innerExpr]);
+        }
+        case Tuple(types) => {
+          var args := [];
+          var i := 0;
+          while i < |types| {
             var generated := GenType(types[i], inBinding, inFn);
-            s := s + generated + ",";
+            args := args + [generated];
+            i := i + 1;
           }
-          s := s + ")";
-
-        case Array(element, dims) =>
-          var elemStr := GenType(element, inBinding, inFn);
-          s := elemStr;
-          for i := 0 to dims {
-            s := "::std::rc::Rc<::std::cell::RefCell<::std::vec::Vec<" + s + ">>>";
+          s := R.TupleType(args);
+        }
+        case Array(element, dims) => {
+          var elem := GenType(element, inBinding, inFn);
+          s := elem;
+          var i := 0;
+          while i < dims {
+            s := R.Rc(R.RefCell(R.Vec(s)));
+            i := i + 1;
           }
-
-        case Seq(element) =>
-          var elemStr := GenType(element, inBinding, inFn);
-          s := "::std::vec::Vec<" + elemStr + ">";
-
-        case Set(element) =>
-          var elemStr := GenType(element, inBinding, inFn);
-          s := "::std::collections::HashSet<" + elemStr + ">";
-
-        case Multiset(element) =>
-          var elemStr := GenType(element, inBinding, inFn);
-          s := "::std::collections::HashMap<" + elemStr + ", u64>";
-
-        case Map(key, value) =>
-          var keyStr := GenType(key, inBinding, inFn);
-          var valueStr := GenType(value, inBinding, inFn);
-          s := "::std::collections::HashMap<" + keyStr + ", " + valueStr + ">";
-
-        case Arrow(args, result) =>
+        }
+        case Seq(element) => {
+          var elem := GenType(element, inBinding, inFn);
+          s := R.TypeApp(R.dafny_runtime_type.MSel("Sequence"), [elem]);
+        }
+        case Set(element) => {
+          var elem := GenType(element, inBinding, inFn);
+          s := R.TypeApp(R.dafny_runtime_type.MSel("Set"), [elem]);
+        }
+        case Multiset(element) => {
+          var elem := GenType(element, inBinding, inFn);
+          s := R.TypeApp(R.dafny_runtime_type.MSel("Multiset"), [elem]);
+        }
+        case Map(key, value) => {
+          var keyType := GenType(key, inBinding, inFn);
+          var valueType := GenType(value, inBinding, inFn);
+          s := R.TypeApp(R.dafny_runtime_type.MSel("Map"), [keyType, valueType]);
+        }
+        case MapBuilder(key, value) => {
+          var keyType := GenType(key, inBinding, inFn);
+          var valueType := GenType(value, inBinding, inFn);
+          s := R.TypeApp(R.dafny_runtime_type.MSel("MapBuilder"), [keyType, valueType]);
+        }
+        case SetBuilder(elem) => {
+          var elemType := GenType(elem, inBinding, inFn);
+          s := R.TypeApp(R.dafny_runtime_type.MSel("SetBuilder"), [elemType]);
+        }
+        case Arrow(args, result) => {
           // we cannot use impl until Rc<Fn> impls Fn
           // if inFn || inBinding {
-          s := "::dafny_runtime::FunctionWrapper<::std::rc::Rc<dyn ::std::ops::Fn(";
+          //  s := "::dafny_runtime::FunctionWrapper<::std::rc::Rc<dyn ::std::ops::Fn(";
           // } else {
           //   s := "::dafny_runtime::FunctionWrapper<impl ::std::ops::Fn(";
           // }
-
-          for i := 0 to |args| {
-            if i > 0 {
-              s := s + ", ";
-            }
+          var argTypes := [];
+          var i := 0;
+          while i < |args| {
 
             var generated := GenType(args[i], inBinding, true);
-            s := s + "&" + generated;
+            argTypes := argTypes + [R.Borrowed(generated)];
+            i := i + 1;
           }
 
           var resultType := GenType(result, inBinding, inFn || inBinding);
+          s := R.TypeApp(
+            R.dafny_runtime_type.MSel("FunctionWrapper"),
+            [R.FnType(argTypes, R.IntersectionType(resultType, R.StaticTrait))]);
 
           // if inFn || inBinding {
-          s := s + ") -> " + resultType + " + 'static>>";
-        // } else {
-        //   s := s + ") -> " + resultType + " + Clone + 'static>";
-        // }
-
-        case TypeArg(Ident(name)) => s := escapeIdent(name);
-        case Primitive(p) =>
+          //s := s + ") -> " + resultType + " + 'static>>";
+          // } else {
+          //   s := s + ") -> " + resultType + " + Clone + 'static>";
+          // }
+        }
+        case TypeArg(Ident(name)) => s := R.RawType(escapeIdent(name));
+        case Primitive(p) => {
           match p {
-            case Int => s := "::dafny_runtime::BigInt";
-            case Real => s := "::dafny_runtime::BigRational";
-            case String => s := "Vec<char>";
-            case Bool => s := "bool";
-            case Char => s := "char";
+            case Int => s := R.dafny_runtime_type.MSel("DafnyInt");
+            case Real => s := R.dafny_runtime_type.MSel("BigRational");
+            case String => s := R.TypeApp(R.dafny_runtime_type.MSel("Sequence"),
+                                          [R.dafny_runtime_type.MSel(DafnyChar)]);
+            case Bool => s := R.RawType("bool");
+            case Char => s := R.dafny_runtime_type.MSel(DafnyChar);
           }
-
-        case Passthrough(v) => s := v;
+        }
+        case Passthrough(v) => s := R.RawType(v);
       }
     }
 
-    static method GenClassImplBody(body: seq<ClassItem>, forTrait: bool, enclosingType: Type, enclosingTypeParams: set<Type>)
+    method GenClassImplBody(body: seq<ClassItem>, forTrait: bool, enclosingType: Type, enclosingTypeParams: set<Type>)
       returns (s: seq<R.ImplMember>, traitBodies: map<seq<Ident>, seq<R.ImplMember>>)
     {
       s := [];
@@ -1186,18 +1734,18 @@ module {:extern "DCOMP"} DCOMP {
       }
     }
 
-    static method GenParams(params: seq<Formal>) returns (s: seq<R.Formal>) {
+    method GenParams(params: seq<Formal>) returns (s: seq<R.Formal>) {
       s := [];
       var i := 0;
       while i < |params| {
         var param := params[i];
         var paramType := GenType(param.typ, false, false);
-        s := s + [R.Formal(escapeIdent(param.name), R.RawType(" &" + paramType))];
+        s := s + [R.Formal(escapeIdent(param.name), R.Borrowed(paramType))];
         i := i + 1;
       }
     }
 
-    static method GenMethod(m: Method, forTrait: bool, enclosingType: Type, enclosingTypeParams: set<Type>) returns (s: R.ImplMember) {
+    method GenMethod(m: Method, forTrait: bool, enclosingType: Type, enclosingTypeParams: set<Type>) returns (s: R.ImplMember) {
       var params: seq<R.Formal> := GenParams(m.params);
       var paramNames := [];
       var paramI := 0;
@@ -1210,29 +1758,23 @@ module {:extern "DCOMP"} DCOMP {
         if (forTrait) {
           params := [R.Formal.self] + params;
         } else {
-          var enclosingTypeString := GenType(enclosingType, false, false);
-          params := [R.Formal("self", R.RawType("&" + enclosingTypeString))] + params;
+          var tpe := GenType(enclosingType, false, false);
+          params := [R.Formal("self", R.Borrowed(tpe))] + params;
         }
       }
 
-      var retType := if |m.outTypes| != 1 then "(" else "";
+      // TODO: Use mut instead of a tuple for the API of multiple output parameters
+      var retTypeArgs := [];
+      //var retType := if |m.outTypes| != 1 then "(" else "";
 
       var typeI := 0;
       while typeI < |m.outTypes| {
-        if typeI > 0 {
-          retType := retType + ", ";
-        }
-
-        var typeString := GenType(m.outTypes[typeI], false, false);
-        retType := retType + typeString;
+        var typeExpr := GenType(m.outTypes[typeI], false, false);
+        retTypeArgs := retTypeArgs + [typeExpr];
 
         typeI := typeI + 1;
       }
 
-      if |m.outTypes| != 1 {
-        retType := retType + ")";
-      }
-
       var visibility := R.PUB;//if forTrait then R.PUB else R.PRIV;
       var fnName := escapeIdent(m.name);
 
@@ -1256,15 +1798,15 @@ module {:extern "DCOMP"} DCOMP {
 
         var i := 0;
         while i < |typeParamsFiltered| {
-          if i > 0 {
-            whereClauses := whereClauses + ", ";
-          }
 
-          var typeString := GenType(typeParamsFiltered[i], false, false);
+          var typeExpr := GenType(typeParamsFiltered[i], false, false);
           typeParams := typeParams + [
-            R.RawTypeParam(typeString + ": ::dafny_runtime::DafnyErasable + ::dafny_runtime::DafnyUnerasable<" + typeString + "> + Clone + ::dafny_runtime::DafnyPrint + ::std::default::Default + 'static")
+            R.RawTypeParam(typeExpr.ToString(IND),
+                           [R.CloneTrait,
+                            R.DafnyPrintTrait,
+                            R.DefaultTrait,
+                            R.StaticTrait])
           ];
-          whereClauses := whereClauses + "<" + typeString + " as ::dafny_runtime::DafnyErasable>::Erased: ::std::cmp::PartialEq";
 
           i := i + 1;
         }
@@ -1273,29 +1815,28 @@ module {:extern "DCOMP"} DCOMP {
       var fBody: Option<R.Expr>;
 
       if m.hasBody {
-        var earlyReturn := "return;";
+        var earlyReturn: R.Expr := R.Return(None);
         match m.outVars {
           case Some(outVars) => {
-            earlyReturn := "return (";
+
+            var tupleArgs := [];
+
             var outI := 0;
             while outI < |outVars| {
-              if outI > 0 {
-                earlyReturn := earlyReturn + ", ";
-              }
 
               var outVar := outVars[outI];
-              earlyReturn := earlyReturn + escapeIdent(outVar.id);
+              tupleArgs := tupleArgs + [R.Identifier(escapeIdent(outVar.id))];
 
               outI := outI + 1;
             }
-            earlyReturn := earlyReturn + ");";
+            earlyReturn := R.Return(Some(R.Tuple(tupleArgs)));
           }
           case None => {}
         }
 
         var body, _ := GenStmts(m.body, if m.isStatic then None else Some("self"), paramNames, true, earlyReturn);
 
-        fBody := Some(R.RawExpr(body));
+        fBody := Some(body);
       } else {
         fBody := None;
       }
@@ -1305,21 +1846,23 @@ module {:extern "DCOMP"} DCOMP {
           fnName,
           typeParams,
           params,
-          Some(R.RawType(retType)),
+          Some(if |retTypeArgs| == 1 then retTypeArgs[0] else R.TupleType(retTypeArgs)),
           whereClauses,
           fBody
         )
       );
     }
 
-    static method GenStmts(stmts: seq<Statement>, selfIdent: Option<string>, params: seq<string>, isLast: bool, earlyReturn: string) returns (generated: string, readIdents: set<string>) {
-      generated := "";
+    method GenStmts(stmts: seq<Statement>, selfIdent: Option<string>, params: seq<string>, isLast: bool, earlyReturn: R.Expr) returns (generated: R.Expr, readIdents: set<string>)
+      decreases stmts, 1
+    {
+      generated := R.RawExpr("");
       var declarations := {};
       readIdents := {};
       var i := 0;
       while i < |stmts| {
         var stmt := stmts[i];
-        var stmtString, recIdents := GenStmt(stmt, selfIdent, params, isLast && (i == |stmts| - 1), earlyReturn);
+        var stmtExpr, recIdents := GenStmt(stmt, selfIdent, params, isLast && (i == |stmts| - 1), earlyReturn);
         readIdents := readIdents + (recIdents - declarations);
 
         match stmt {
@@ -1328,17 +1871,15 @@ module {:extern "DCOMP"} DCOMP {
           }
           case _ => {}
         }
+        generated := generated.Then(stmtExpr);
 
-        if i > 0 {
-          generated := generated + "\n";
-        }
-
-        generated := generated + stmtString;
         i := i + 1;
       }
     }
 
-    static method GenAssignLhs(lhs: AssignLhs, rhs: string, selfIdent: Option<string>, params: seq<string>) returns (generated: string, needsIIFE: bool, readIdents: set<string>) {
+    method GenAssignLhs(lhs: AssignLhs, rhs: string, selfIdent: Option<string>, params: seq<string>) returns (generated: string, needsIIFE: bool, readIdents: set<string>)
+      decreases lhs, 1
+    {
       match lhs {
         case Ident(Ident(id)) => {
           if id in params {
@@ -1352,33 +1893,30 @@ module {:extern "DCOMP"} DCOMP {
         }
 
         case Select(on, field) => {
-          var onExpr, onOwned, onErased, recIdents := GenExpr(on, selfIdent, params, false);
-          generated := "*(" + onExpr + "." + field + ".borrow_mut()) = " + rhs + ";";
+          var onExpr, onOwned, recIdents := GenExpr(on, selfIdent, params, OwnershipBorrowed);
+          generated := "*(" + onExpr.ToString(IND) + "." + field + ".borrow_mut()) = " + rhs + ";";
           readIdents := recIdents;
           needsIIFE := true;
         }
 
         case Index(on, indices) => {
-          var onExpr, onOwned, onErased, recIdents := GenExpr(on, selfIdent, params, false);
+          var onExpr, onOwned, recIdents := GenExpr(on, selfIdent, params, OwnershipBorrowed);
           readIdents := recIdents;
 
           generated := "{\n";
 
           var i := 0;
           while i < |indices| {
-            var idx, _, idxErased, recIdentsIdx := GenExpr(indices[i], selfIdent, params, true);
-            if !idxErased {
-              idx := "::dafny_runtime::DafnyErasable::erase_owned(" + idx + ")";
-            }
+            var idx, _, recIdentsIdx := GenExpr(indices[i], selfIdent, params, OwnershipOwned);
 
-            generated := generated + "let __idx" + Strings.OfNat(i) + " = <usize as ::dafny_runtime::NumCast>::from(" + idx + ").unwrap();\n";
+            generated := generated + "let __idx" + Strings.OfNat(i) + " = <usize as ::dafny_runtime::NumCast>::from(" + idx.ToString(IND) + ").unwrap();\n";
 
             readIdents := readIdents + recIdentsIdx;
 
             i := i + 1;
           }
 
-          generated := generated + onExpr + ".borrow_mut()";
+          generated := generated + onExpr.ToString(IND) + ".borrow_mut()";
           i := 0;
           while i < |indices| {
             generated := generated + "[__idx" + Strings.OfNat(i) + "]";
@@ -1391,121 +1929,108 @@ module {:extern "DCOMP"} DCOMP {
       }
     }
 
-    static method GenStmt(stmt: Statement, selfIdent: Option<string>, params: seq<string>, isLast: bool, earlyReturn: string) returns (generated: string, readIdents: set<string>) {
+    method GenStmt(stmt: Statement, selfIdent: Option<string>, params: seq<string>, isLast: bool, earlyReturn: R.Expr) returns (generated: R.Expr, readIdents: set<string>)
+      decreases stmt, 1
+    {
       match stmt {
         case DeclareVar(name, typ, Some(expression)) => {
           var typeString := GenType(typ, true, false);
-          var expr, _, recErased, recIdents := GenExpr(expression, selfIdent, params, true);
-          if !recErased {
-            expr := "::dafny_runtime::DafnyErasable::erase_owned(" + expr + ")";
-          }
+          var expr, _, recIdents := GenExpr(expression, selfIdent, params, OwnershipOwned);
 
-          expr := "<" + typeString + " as ::dafny_runtime::DafnyUnerasable<_>>::unerase_owned(" + expr + ")";
-
-          generated := "let mut " + escapeIdent(name) + ": " + typeString + " = " + expr + ";";
+          generated := R.DeclareVar(R.MUT, escapeIdent(name), Some(typeString), Some(expr));
           readIdents := recIdents;
         }
         case DeclareVar(name, typ, None) => {
           var typeString := GenType(typ, true, false);
-          generated := "let mut " + escapeIdent(name) + ": " + typeString + ";";
+          generated := R.DeclareVar(R.MUT, escapeIdent(name), Some(typeString), None);
           readIdents := {};
         }
         case Assign(lhs, expression) => {
           var lhsGen, needsIIFE, recIdents := GenAssignLhs(lhs, "__rhs", selfIdent, params);
-          var exprGen, _, exprErased, exprIdents := GenExpr(expression, selfIdent, params, true);
-          if !exprErased {
-            exprGen := "::dafny_runtime::DafnyErasable::erase_owned(" + exprGen + ")";
-          }
-
-          exprGen := "::dafny_runtime::DafnyUnerasable::<_>::unerase_owned(" + exprGen + ")";
+          var exprGen, _, exprIdents := GenExpr(expression, selfIdent, params, OwnershipOwned);
 
           if needsIIFE {
-            generated := "{\nlet __rhs = " + exprGen + ";\n" + lhsGen + "\n}";
+            generated := R.Block(
+              R.StmtExpr(
+                R.DeclareVar(R.CONST, "__rhs", None, Some(exprGen)),
+                R.RawExpr(lhsGen)
+              )
+            );
           } else {
-            generated := lhsGen + " = " + exprGen + ";";
+            generated := R.AssignVar(lhsGen, exprGen);
           }
 
           readIdents := recIdents + exprIdents;
         }
         case If(cond, thn, els) => {
-          var condString, _, condErased, recIdents := GenExpr(cond, selfIdent, params, true);
-          if !condErased {
-            condString := "::dafny_runtime::DafnyErasable::erase_owned(" + condString + ")";
-          }
+          var cond, _, recIdents := GenExpr(cond, selfIdent, params, OwnershipOwned);
+          var condString := cond.ToString(IND);
 
           readIdents := recIdents;
-          var thnString, thnIdents := GenStmts(thn, selfIdent, params, isLast, earlyReturn);
+          var thn, thnIdents := GenStmts(thn, selfIdent, params, isLast, earlyReturn);
           readIdents := readIdents + thnIdents;
-          var elsString, elsIdents := GenStmts(els, selfIdent, params, isLast, earlyReturn);
+          var els, elsIdents := GenStmts(els, selfIdent, params, isLast, earlyReturn);
           readIdents := readIdents + elsIdents;
-          generated := "if " + condString + " {\n" + thnString + "\n} else {\n" + elsString + "\n}";
+          generated := R.IfExpr(cond, thn, els);
         }
         case Labeled(lbl, body) => {
-          var bodyString, bodyIdents := GenStmts(body, selfIdent, params, isLast, earlyReturn);
+          var body, bodyIdents := GenStmts(body, selfIdent, params, isLast, earlyReturn);
           readIdents := bodyIdents;
-          generated := "'label_" + lbl + ": loop {\n" + bodyString + "\n" + "break;" + "\n}";
+          generated := R.Labelled("label_" + lbl, R.Loop(None, R.StmtExpr(body, R.Break(None))));
         }
         case While(cond, body) => {
-          var condString, _, condErased, recIdents := GenExpr(cond, selfIdent, params, true);
-          if !condErased {
-            condString := "::dafny_runtime::DafnyErasable::erase_owned(" + condString + ")";
-          }
+          var cond, _, recIdents := GenExpr(cond, selfIdent, params, OwnershipOwned);
 
           readIdents := recIdents;
-          var bodyString, bodyIdents := GenStmts(body, selfIdent, params, false, earlyReturn);
+          var body, bodyIdents := GenStmts(body, selfIdent, params, false, earlyReturn);
           readIdents := readIdents + bodyIdents;
 
-          generated := "while " + condString + " {\n" + bodyString + "\n}";
+          generated := R.Loop(Some(cond), body);
         }
         case Foreach(boundName, boundType, over, body) => {
-          var overString, _, overErased, recIdents := GenExpr(over, selfIdent, params, true);
+          var over, _, recIdents := GenExpr(over, selfIdent, params, OwnershipOwned);
 
           var boundTypeStr := GenType(boundType, false, false);
 
           readIdents := recIdents;
-          var bodyString, bodyIdents := GenStmts(body, selfIdent, params + [boundName], false, earlyReturn);
+          var body, bodyIdents := GenStmts(body, selfIdent, params + [boundName], false, earlyReturn);
           readIdents := readIdents + bodyIdents - {boundName};
 
-          var unerasedIter := "_iter_erased";
-          if overErased {
-            unerasedIter := "<" + boundTypeStr + " as ::dafny_runtime::DafnyUnerasable<_>>::unerase_owned(" + unerasedIter + ")";
-          }
-
-          generated := "for _iter_erased in " + overString + " {\n";
-          generated := generated + "let " + escapeIdent(boundName) + " = " + unerasedIter + ";\n" + bodyString + "\n}";
+          generated := R.For(escapeIdent(boundName), over, body);
         }
         case Break(toLabel) => {
           match toLabel {
             case Some(lbl) => {
-              generated := "break 'label_" + lbl + ";";
+              generated := R.Break(Some("label_" + lbl));
             }
             case None => {
-              generated := "break;";
+              generated := R.Break(None);
             }
           }
           readIdents := {};
         }
         case TailRecursive(body) => {
           // clone the parameters to make them mutable
-          generated := "";
+          generated := R.RawExpr("");
 
           if selfIdent != None {
-            generated := generated + "let mut _this = self.clone();\n";
+            generated := generated.Then(R.DeclareVar(R.MUT, "_this", None, Some(R.RawExpr("self.clone()"))));
           }
 
           var paramI := 0;
           while paramI < |params| {
             var param := params[paramI];
-            generated := generated + "let mut " + escapeIdent(param) + " = " + escapeIdent(param) + ".clone();\n";
+            generated := generated.Then(R.DeclareVar(R.MUT, escapeIdent(param), None, Some(R.Clone(R.Identifier(escapeIdent(param))))));
             paramI := paramI + 1;
           }
 
-          var bodyString, bodyIdents := GenStmts(body, if selfIdent != None then Some("_this") else None, [], false, earlyReturn);
+          var body, bodyIdents := GenStmts(body, if selfIdent != None then Some("_this") else None, [], false, earlyReturn);
           readIdents := bodyIdents;
-          generated := generated + "'TAIL_CALL_START: loop {\n" + bodyString + "\n}";
+          generated := generated.Then(R.Labelled("TAIL_CALL_START",
+                                                 R.Loop(None, body)));
         }
         case JumpTailCallStart() => {
-          generated := "continue 'TAIL_CALL_START;";
+          generated := R.Continue(Some("TAIL_CALL_START"));
           readIdents := {};
         }
         case Call(on, name, typeArgs, args, maybeOutVars) => {
@@ -1514,18 +2039,14 @@ module {:extern "DCOMP"} DCOMP {
           var typeArgString := "";
           if (|typeArgs| >= 1) {
             var typeI := 0;
-            typeArgString := "::<";
+            var typeArgsR := [];
             while typeI < |typeArgs| {
-              if typeI > 0 {
-                typeArgString := typeArgString + ", ";
-              }
-
-              var typeString := GenType(typeArgs[typeI], false, false);
-              typeArgString := typeArgString + typeString;
+              var tpe := GenType(typeArgs[typeI], false, false);
+              typeArgsR := typeArgsR + [tpe];
 
               typeI := typeI + 1;
             }
-            typeArgString := typeArgString + ">";
+            typeArgString := R.TypeApp(R.TIdentifier("::"), typeArgsR).ToString(IND);
           }
 
           var argString := "";
@@ -1535,22 +2056,18 @@ module {:extern "DCOMP"} DCOMP {
               argString := argString + ", ";
             }
 
-            var argExpr, isOwned, argErased, argIdents := GenExpr(args[i], selfIdent, params, false);
-            if argErased {
-              argExpr := "::dafny_runtime::DafnyUnerasable::<_>::unerase_owned(" + argExpr + ")";
-            }
-            if isOwned {
-              argExpr := "&" + argExpr;
-            }
+            var argExpr, ownership, argIdents := GenExpr(args[i], selfIdent, params, OwnershipBorrowed);
+            var argExprString := argExpr.ToString(IND);
 
-            argString := argString + argExpr;
+            argString := argString + argExprString;
             readIdents := readIdents + argIdents;
 
             i := i + 1;
           }
 
-          var enclosingString, _, _, enclosingIdents := GenExpr(on, selfIdent, params, false);
+          var onExpr, _, enclosingIdents := GenExpr(on, selfIdent, params, OwnershipAutoBorrowed);
           readIdents := readIdents + enclosingIdents;
+          var enclosingString := onExpr.ToString(IND);
           match on {
             case Companion(_) => {
               enclosingString := enclosingString + "::";
@@ -1584,19 +2101,24 @@ module {:extern "DCOMP"} DCOMP {
             case None => {}
           }
 
-          generated :=
+          var renderedName := match name {
+            case Name(name) => escapeIdent(name)
+            case MapBuilderAdd() | SetBuilderAdd() => "add"
+            case MapBuilderBuild() | SetBuilderBuild() => "build"
+          };
+
+          generated := R.RawExpr(
             (if receiver != "" then (receiver + " = ") else "") +
-            enclosingString + escapeIdent(name) + typeArgString + "(" + argString + ");";
+            enclosingString + renderedName + typeArgString + "(" + argString + ");");
         }
         case Return(expr) => {
-          var exprString, _, recErased, recIdents := GenExpr(expr, selfIdent, params, true);
-          exprString := "::dafny_runtime::DafnyUnerasable::<_>::unerase_owned(::dafny_runtime::DafnyErasable::erase_owned(" + exprString + "))";
+          var expr, _, recIdents := GenExpr(expr, selfIdent, params, OwnershipOwned);
           readIdents := recIdents;
 
           if isLast {
-            generated := exprString;
+            generated := expr;
           } else {
-            generated := "return " + exprString + ";";
+            generated := R.Return(Some(expr));
           }
         }
         case EarlyReturn() => {
@@ -1604,118 +2126,614 @@ module {:extern "DCOMP"} DCOMP {
           readIdents := {};
         }
         case Halt() => {
-          generated := "panic!(\"Halt\");";
+          generated := R.RawExpr("panic!(\"Halt\");");
           readIdents := {};
         }
         case Print(e) => {
-          var printedExpr, isOwned, _, recIdents := GenExpr(e, selfIdent, params, false);
-          if isOwned {
-            printedExpr := "&(" + printedExpr + ")";
-          }
-          generated := "print!(\"{}\", ::dafny_runtime::DafnyPrintWrapper(" + printedExpr + "));";
+          var printedExpr, recOwnership, recIdents := GenExpr(e, selfIdent, params, OwnershipBorrowed);
+          var printedExprString := printedExpr.ToString(IND);
+          generated := R.RawExpr("print!(\"{}\", ::dafny_runtime::DafnyPrintWrapper(" + printedExprString + "));");
           readIdents := recIdents;
         }
       }
     }
 
-    static method GenExpr(e: Expression, selfIdent: Option<string>, params: seq<string>, mustOwn: bool) returns (s: string, isOwned: bool, isErased: bool, readIdents: set<string>)
-      ensures mustOwn ==> isOwned
-      decreases e {
+    static const OpTable: map<BinOp, string>
+      :=
+      map[
+        Mod() := "%",
+        And() := "&&",
+        Or() := "||",
+        Div() := "/",
+        Lt() := "<",
+        LtChar() := "<",
+        Plus() := "+",
+        Minus() := "-",
+        Times() := "*",
+        BitwiseAnd() := "&",
+        BitwiseOr() := "|",
+        BitwiseXor() := "^",
+        BitwiseShiftRight() := ">>",
+        BitwiseShiftLeft() := "<<"
+      ]
+
+    static function NewtypeToRustType(base: Type, range: NewtypeRange)
+      : Option<R.Type> {
+      match range {
+        case NoRange() => None
+        case U8() => Some(R.Type.U8)
+        case U16() => Some(R.Type.U16)
+        case U32() => Some(R.Type.U32)
+        case U64() => Some(R.Type.U64)
+        case U128() => Some(R.Type.U128)
+        case I8() => Some(R.Type.I8)
+        case I16() => Some(R.Type.I16)
+        case I32() => Some(R.Type.I32)
+        case I64() => Some(R.Type.I64)
+        case I128() => Some(R.Type.I128)
+        case _ => None
+      }
+    }
+
+    static method FromOwned(r: R.Expr, expectedOwnership: Ownership)
+      returns (out: R.Expr, resultingOwnership: Ownership)
+      ensures resultingOwnership != OwnershipAutoBorrowed
+      ensures expectedOwnership != OwnershipAutoBorrowed
+              ==> resultingOwnership == expectedOwnership
+    {
+      if expectedOwnership == OwnershipOwned || expectedOwnership == OwnershipAutoBorrowed {
+        out := r;
+        resultingOwnership := OwnershipOwned;
+      } else if expectedOwnership == OwnershipBorrowed {
+        out := R.Borrow(r);
+        resultingOwnership := OwnershipBorrowed;
+      } else {
+        assert expectedOwnership == OwnershipBorrowedMut;
+        out := R.BorrowMut(r);
+        resultingOwnership := OwnershipBorrowedMut;
+      }
+    }
+
+    static method FromOwnership(r: R.Expr, ownership: Ownership, expectedOwnership: Ownership)
+      returns (out: R.Expr, resultingOwnership: Ownership)
+      requires ownership != OwnershipAutoBorrowed
+      ensures OwnershipGuarantee(expectedOwnership, resultingOwnership)
+    {
+      if ownership == OwnershipOwned {
+        out, resultingOwnership := FromOwned(r, expectedOwnership);
+        return;
+      } else if ownership == OwnershipBorrowed || ownership == OwnershipBorrowedMut {
+        if expectedOwnership == OwnershipOwned {
+          resultingOwnership := OwnershipOwned;
+          out := R.Clone(r);
+        } else if expectedOwnership == ownership
+                  || expectedOwnership == OwnershipAutoBorrowed {
+          resultingOwnership := ownership;
+          out := r;
+        } else if expectedOwnership == OwnershipBorrowed
+                  && ownership == OwnershipBorrowedMut {
+          resultingOwnership := OwnershipBorrowed;
+          out := r;
+        } else {
+          assert expectedOwnership == OwnershipBorrowedMut;
+          resultingOwnership := OwnershipBorrowedMut;
+          out := R.BorrowMut(r); // Not sure if it will ever happen
+        }
+      } else {
+        assert false;
+      }
+    }
+
+    static predicate OwnershipGuarantee(expectedOwnership: Ownership, resultingOwnership: Ownership) {
+      && (expectedOwnership != OwnershipAutoBorrowed ==>
+            resultingOwnership == expectedOwnership)
+      && resultingOwnership != OwnershipAutoBorrowed // We know what's going on
+    }
+
+    method GenExprLiteral(
+      e: Expression,
+      selfIdent: Option<string>,
+      params: seq<string>,
+      expectedOwnership: Ownership
+    ) returns (r: R.Expr, resultingOwnership: Ownership, readIdents: set<string>)
+      requires e.Literal?
+      ensures OwnershipGuarantee(expectedOwnership, resultingOwnership)
+      decreases e, 0
+    {
       match e {
         case Literal(BoolLiteral(false)) => {
-          s := "false";
-          isOwned := true;
-          isErased := false;
+          r, resultingOwnership :=
+            FromOwned(R.RawExpr("false"), expectedOwnership);
           readIdents := {};
+          return;
         }
         case Literal(BoolLiteral(true)) => {
-          s := "true";
-          isOwned := true;
-          isErased := false;
+          r, resultingOwnership :=
+            FromOwned(R.RawExpr("true"), expectedOwnership);
           readIdents := {};
+          return;
         }
         case Literal(IntLiteral(i, t)) => {
           match t {
             case Primitive(Int) => {
-              s := "::dafny_runtime::BigInt::parse_bytes(b\"" + i + "\", 10).unwrap()";
+              if |i| <= 4 {
+                r := R.dafny_runtime.MSel("DafnyInt").MSel("from").Apply1(R.LiteralInt(i));
+              } else {
+                r := R.dafny_runtime.MSel("DafnyInt").MSel("from").Apply1(
+                  R.LiteralString(i, binary := true));
+              }
             }
             case o => {
               var genType := GenType(o, false, false);
-              s := "(" + i + " as " + genType + ")";
+              r := R.TypeAscription(R.RawExpr(i), genType);
             }
           }
-
-          isOwned := true;
-          isErased := false;
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
           readIdents := {};
+          return;
         }
         case Literal(DecLiteral(n, d, t)) => {
           match t {
             case Primitive(Real) => {
-              s := "::dafny_runtime::BigRational::new(::dafny_runtime::BigInt::parse_bytes(b\"" + n + "\", 10).unwrap(), ::dafny_runtime::BigInt::parse_bytes(b\"" + d + "\", 10).unwrap())";
+              r := R.RcNew(R.RawExpr("::dafny_runtime::BigRational::new(::dafny_runtime::BigInt::parse_bytes(b\"" + n + "\", 10).unwrap(), ::dafny_runtime::BigInt::parse_bytes(b\"" + d + "\", 10).unwrap())"));
             }
             case o => {
               var genType := GenType(o, false, false);
-              s := "((" + n + ".0 / " + d + ".0" + ") as " + genType + ")";
+              r := R.TypeAscription(R.RawExpr("(" + n + ".0 / " + d + ".0" + ")"), genType);
             }
           }
 
-          isOwned := true;
-          isErased := false;
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
           readIdents := {};
+          return;
         }
         case Literal(StringLiteral(l)) => {
-          // TODO(shadaj): handle unicode properly
-          s := "\"" + l + "\".chars().collect::<Vec<char>>()";
-          isOwned := true;
-          isErased := false;
+          r := R.dafny_runtime.MSel("string_of").Apply1(R.LiteralString(l, false));
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
           readIdents := {};
+          return;
         }
         case Literal(CharLiteral(c)) => {
-          s := "::std::primitive::char::from_u32(" + Strings.OfNat(c as nat) + ").unwrap()";
-          isOwned := true;
-          isErased := false;
+          r := R.LiteralInt(Strings.OfNat(c as nat));
+          if !UnicodeChars {
+            r :=
+              R.global.MSel("std").MSel("primitive")
+              .MSel("char").MSel("from_u16")
+              .Apply1(r).Sel("unwrap").Apply([], []);
+          } else {
+            r :=
+              R.global.MSel("std").MSel("primitive")
+              .MSel("char").MSel("from_u32")
+              .Apply1(r).Sel("unwrap").Apply([], []);
+          }
+          r := R.dafny_runtime.MSel(DafnyChar).Apply1(r);
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
           readIdents := {};
+          return;
         }
         case Literal(Null(tpe)) => {
+          // TODO: Mikael. Null will be std::ptr::null, not Option::None.
           var tpeGen := GenType(tpe, false, false);
-          s := "(None as " + tpeGen + ")";
-          isOwned := true;
-          isErased := false;
+          r := R.TypeAscription(R.RawExpr("None"), tpeGen);
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
           readIdents := {};
+          return;
         }
-        case Ident(name) => {
-          s := escapeIdent(name);
-          if !(name in params) {
-            s := "(&" + s + ")";
-          }
+      }
+    }
 
-          if mustOwn {
-            s := s + ".clone()";
-            isOwned := true;
+    method GenExprBinary(
+      e: Expression,
+      selfIdent: Option<string>,
+      params: seq<string>,
+      expectedOwnership: Ownership
+    ) returns (r: R.Expr, resultingOwnership: Ownership, readIdents: set<string>)
+      requires e.BinOp?
+      ensures OwnershipGuarantee(expectedOwnership, resultingOwnership)
+      decreases e, 0
+    {
+      var BinOp(op, lExpr, rExpr, format) := e;
+      var becomesLeftCallsRight := match op {
+        case SetMerge()
+          | SetSubtraction()
+          | SetIntersection()
+          | SetDisjoint()
+          | MapMerge()
+          | MapSubtraction()
+          | MultisetMerge()
+          | MultisetSubtraction()
+          | MultisetIntersection()
+          | MultisetDisjoint()
+          | Concat()
+          => true
+        case _ => false
+      };
+      var becomesRightCallsLeft := match op {
+        case In() => true
+        case _ => false
+      };
+      var becomesCallLeftRight := match op {
+        case Eq(true, false) => true
+        case _ => false
+      };
+      var expectedLeftOwnership :=
+        if becomesLeftCallsRight then OwnershipAutoBorrowed
+        else if becomesRightCallsLeft || becomesCallLeftRight then OwnershipBorrowed
+        else OwnershipOwned;
+      var expectedRightOwnership :=
+        if becomesLeftCallsRight || becomesCallLeftRight then OwnershipBorrowed
+        else if becomesRightCallsLeft then OwnershipAutoBorrowed
+        else OwnershipOwned;
+      var left, _, recIdentsL := GenExpr(lExpr, selfIdent, params, expectedLeftOwnership);
+      var right, _, recIdentsR := GenExpr(rExpr, selfIdent, params, expectedRightOwnership);
+
+      match op {
+        case In() => {
+          r := right.Sel("contains").Apply1(left);
+        }
+        case SeqProperPrefix() =>
+          r := R.BinaryOp("<", left, right, format);
+        case SeqPrefix() =>
+          r := R.BinaryOp("<=", left, right, format);
+        case SetMerge() => {
+          r := left.Sel("merge").Apply1(right);
+        }
+        case SetSubtraction() => {
+          r := left.Sel("subtract").Apply1(right);
+        }
+        case SetIntersection() => {
+          r := left.Sel("intersect").Apply1(right);
+        }
+        case Subset() => {
+          r := R.BinaryOp("<=", left, right, format);
+        }
+        case ProperSubset() => {
+          r := R.BinaryOp("<", left, right, format);
+        }
+        case SetDisjoint() => {
+          r := left.Sel("disjoint").Apply1(right);
+        }
+        case MapMerge() => {
+          r := left.Sel("merge").Apply1(right);
+        }
+        case MapSubtraction() => {
+          r := left.Sel("subtract").Apply1(right);
+        }
+        case MultisetMerge() => {
+          r := left.Sel("merge").Apply1(right);
+        }
+        case MultisetSubtraction() => {
+          r := left.Sel("subtract").Apply1(right);
+        }
+        case MultisetIntersection() => {
+          r := left.Sel("intersect").Apply1(right);
+        }
+        case Submultiset() => {
+          r := R.BinaryOp("<=", left, right, format);
+        }
+        case ProperSubmultiset() => {
+          r := R.BinaryOp("<", left, right, format);
+        }
+        case MultisetDisjoint() => {
+          r := left.Sel("disjoint").Apply1(right);
+        }
+        case Concat() => {
+          r := left.Sel("concat").Apply1(right);
+        }
+        case _ => {
+
+          if op in OpTable {
+            r := R.Expr.BinaryOp(
+              OpTable[op],
+              left,
+              right,
+              format);
           } else {
-            isOwned := false;
+            match op {
+              case Eq(referential, nullable) => {
+                if (referential) {
+                  // TODO: Render using a call with two expressions
+                  if (nullable) {
+                    r := R.Call(R.RawExpr("::dafny_runtime::nullable_referential_equality"), [], [left, right]);
+                  } else {
+                    r := R.Call(R.RawExpr("::std::rc::Rc::ptr_eq"), [], [left, right]);
+                  }
+                } else {
+                  r := R.BinaryOp("==", left, right, DAST.Format.BinaryOpFormat.NoFormat());
+                }
+              }
+              case EuclidianDiv() => {
+                r := R.Call(R.RawExpr("::dafny_runtime::euclidian_division"), [], [left, right]);
+              }
+              case EuclidianMod() => {
+                r := R.Call(R.RawExpr("::dafny_runtime::euclidian_modulo"), [], [left, right]);
+              }
+              case Passthrough(op) => {
+                r := R.Expr.BinaryOp(op, left, right, format);
+              }
+            }
+          }
+        }
+      }
+      r, resultingOwnership := FromOwned(r, expectedOwnership);
+      readIdents := recIdentsL + recIdentsR;
+      return;
+    }
+
+    method GenExprConvertFromNullable(
+      e: Expression,
+      selfIdent: Option<string>,
+      params: seq<string>,
+      expectedOwnership: Ownership
+    ) returns (r: R.Expr, resultingOwnership: Ownership, readIdents: set<string>)
+      requires e.Convert?
+      requires e.from != e.typ
+      requires e.from.Nullable?
+      ensures OwnershipGuarantee(expectedOwnership, resultingOwnership)
+      decreases e, 0, 0
+    {
+      var Convert(expr, fromTpe, toTpe) := e;
+      var recursiveGen, recOwned, recIdents := GenExpr(expr, selfIdent, params, expectedOwnership);
+      r := recursiveGen;
+      if recOwned == OwnershipOwned {
+        r := r.Sel("as_ref").Apply([], []);
+      }
+      r := r.Sel("unwrap").Apply([], []);
+      r, resultingOwnership := FromOwnership(r, recOwned, expectedOwnership);
+      readIdents := recIdents;
+    }
+
+    method GenExprConvertToNullable(
+      e: Expression,
+      selfIdent: Option<string>,
+      params: seq<string>,
+      expectedOwnership: Ownership
+    ) returns (r: R.Expr, resultingOwnership: Ownership, readIdents: set<string>)
+      requires e.Convert?
+      requires e.from != e.typ
+      requires !e.from.Nullable? && e.typ.Nullable?
+      ensures OwnershipGuarantee(expectedOwnership, resultingOwnership)
+      decreases e, 0, 0
+    {
+      var Convert(expr, fromTpe, toTpe) := e;
+      var recursiveGen, recOwned, recIdents := GenExpr(expr, selfIdent, params, expectedOwnership);
+      r := recursiveGen;
+      if recOwned == OwnershipOwned {
+        r := r.Sel("clone").Apply([], []);
+      }
+
+      r := R.std.MSel("option").MSel("Option").MSel("Some").Apply([], [r]);
+      r, resultingOwnership := FromOwnership(r, recOwned, expectedOwnership);
+      readIdents := recIdents;
+    }
+
+    method GenExprConvertToNewtype(
+      e: Expression,
+      selfIdent: Option<string>,
+      params: seq<string>,
+      expectedOwnership: Ownership
+    ) returns (r: R.Expr, resultingOwnership: Ownership, readIdents: set<string>)
+      requires e.Convert?
+      requires e.from != e.typ
+      requires !e.from.Nullable? && e.typ.Path? && e.typ.resolved.Newtype?
+      ensures OwnershipGuarantee(expectedOwnership, resultingOwnership)
+      decreases e, 0, 0
+    {
+      var Convert(expr, fromTpe, toTpe) := e;
+      var Path(_, _, Newtype(b, range, erase)) := toTpe;
+      if fromTpe == b {
+        var recursiveGen, recOwned, recIdents := GenExpr(expr, selfIdent, params, expectedOwnership);
+
+        var potentialRhsType := NewtypeToRustType(b, range);
+        match potentialRhsType {
+          case Some(v) =>
+            r := R.ConversionNum(v, recursiveGen);
+            r, resultingOwnership := FromOwned(r, expectedOwnership);
+          case None =>
+            if erase {
+              r := recursiveGen;
+            } else {
+              var rhsType := GenType(toTpe, true, false);
+              r := R.RawExpr(rhsType.ToString(IND) + "(" + recursiveGen.ToString(IND) + ")");
+            }
+            r, resultingOwnership := FromOwnership(r, recOwned, expectedOwnership);
+        }
+        readIdents := recIdents;
+        assert OwnershipGuarantee(expectedOwnership, resultingOwnership);
+      } else {
+        assume {:axiom} Convert(Convert(expr, fromTpe, b), b, toTpe) < e; // make termination go through
+        r, resultingOwnership, readIdents := GenExpr(Convert(Convert(expr, fromTpe, b), b, toTpe), selfIdent, params, expectedOwnership);
+        assert OwnershipGuarantee(expectedOwnership, resultingOwnership);
+      }
+    }
+
+
+    method GenExprConvertFromNewtype(
+      e: Expression,
+      selfIdent: Option<string>,
+      params: seq<string>,
+      expectedOwnership: Ownership
+    ) returns (r: R.Expr, resultingOwnership: Ownership, readIdents: set<string>)
+      requires e.Convert?
+      requires e.from != e.typ
+      requires !e.from.Nullable? && (!e.typ.Path? || !e.typ.resolved.Newtype?)
+      requires e.from.Path? && e.from.resolved.Newtype?
+      ensures OwnershipGuarantee(expectedOwnership, resultingOwnership)
+      decreases e, 0, 0
+    {
+      var Convert(expr, fromTpe, toTpe) := e;
+      var Path(_, _, Newtype(b, range, erase)) := fromTpe;
+      if b == toTpe {
+        var recursiveGen, recOwned, recIdents := GenExpr(expr, selfIdent, params, expectedOwnership);
+        if erase {
+          r := recursiveGen;
+        } else {
+          r := recursiveGen.Sel("0");
+        }
+        r, resultingOwnership := FromOwnership(r, recOwned, expectedOwnership);
+        readIdents := recIdents;
+      } else {
+        assume {:axiom} Convert(Convert(expr, fromTpe, b), b, toTpe) < e; // make termination go through
+        r, resultingOwnership, readIdents := GenExpr(Convert(Convert(expr, fromTpe, b), b, toTpe), selfIdent, params, expectedOwnership);
+      }
+      assert OwnershipGuarantee(expectedOwnership, resultingOwnership);
+    }
+
+    method GenExprConvertNotImplemented(
+      e: Expression,
+      selfIdent: Option<string>,
+      params: seq<string>,
+      expectedOwnership: Ownership
+    ) returns (r: R.Expr, resultingOwnership: Ownership, readIdents: set<string>)
+      requires e.Convert?
+      ensures OwnershipGuarantee(expectedOwnership, resultingOwnership)
+      decreases e, 0, 0
+    {
+      var Convert(expr, fromTpe, toTpe) := e;
+      var recursiveGen, recOwned, recIdents := GenExpr(expr, selfIdent, params, expectedOwnership);
+      r := R.RawExpr("(" + recursiveGen.ToString(IND) + "/* conversion not yet implemented */)");
+      r, resultingOwnership := FromOwned(r, expectedOwnership);
+      readIdents := recIdents;
+    }
+
+    method GenExprConvert(
+      e: Expression,
+      selfIdent: Option<string>,
+      params: seq<string>,
+      expectedOwnership: Ownership
+    ) returns (r: R.Expr, resultingOwnership: Ownership, readIdents: set<string>)
+      requires e.Convert?
+      ensures OwnershipGuarantee(expectedOwnership, resultingOwnership)
+      decreases e, 0
+    {
+      var Convert(expr, fromTpe, toTpe) := e;
+      if fromTpe == toTpe {
+        var recursiveGen, recOwned, recIdents := GenExpr(expr, selfIdent, params, expectedOwnership);
+        r := recursiveGen;
+        r, resultingOwnership := FromOwnership(r, recOwned, expectedOwnership);
+        readIdents := recIdents;
+      } else {
+        match (fromTpe, toTpe) {
+          case (Nullable(_), _) => {
+            r, resultingOwnership, readIdents := GenExprConvertFromNullable(e, selfIdent, params, expectedOwnership);
+          }
+          case (_, Nullable(_)) => {
+            r, resultingOwnership, readIdents := GenExprConvertToNullable(e, selfIdent, params, expectedOwnership);
           }
+          case (_, Path(_, _, Newtype(b, range, erase))) => {
+            r, resultingOwnership, readIdents := GenExprConvertToNewtype(e, selfIdent, params, expectedOwnership);
+          }
+          case (Path(_, _, Newtype(b, range, erase)), _) => {
+            r, resultingOwnership, readIdents := GenExprConvertFromNewtype(e, selfIdent, params, expectedOwnership);
+          }
+          case (Primitive(Int), Primitive(Real)) => {
+            var recursiveGen, _, recIdents := GenExpr(expr, selfIdent, params, OwnershipOwned);
+            r := R.RcNew(R.RawExpr("::dafny_runtime::BigRational::from_integer(" + recursiveGen.ToString(IND) + ")"));
+            r, resultingOwnership := FromOwned(r, expectedOwnership);
+            readIdents := recIdents;
+          }
+          case (Primitive(Real), Primitive(Int)) => {
+            var recursiveGen, _, recIdents := GenExpr(expr, selfIdent, params, OwnershipBorrowed);
+            r := R.RawExpr("::dafny_runtime::dafny_rational_to_int(" + recursiveGen.ToString(IND) + ")");
+            r, resultingOwnership := FromOwned(r, expectedOwnership);
+            readIdents := recIdents;
+          }
+          case (Primitive(Int), Passthrough(_)) => {
+            var rhsType := GenType(toTpe, true, false);
+            var recursiveGen, _, recIdents := GenExpr(expr, selfIdent, params, OwnershipOwned);
+            r := R.RawExpr("<" + rhsType.ToString(IND) + " as ::dafny_runtime::NumCast>::from(" + recursiveGen.ToString(IND) + ").unwrap()");
+            r, resultingOwnership := FromOwned(r, expectedOwnership);
+            readIdents := recIdents;
+          }
+          case (Passthrough(_), Primitive(Int)) => {
+            var rhsType := GenType(fromTpe, true, false);
+            var recursiveGen, _, recIdents := GenExpr(expr, selfIdent, params, OwnershipOwned);
+            r := R.RawExpr("::dafny_runtime::DafnyInt{data: ::dafny_runtime::BigInt::from(" + recursiveGen.ToString(IND) + ")}");
+            r, resultingOwnership := FromOwned(r, expectedOwnership);
+            readIdents := recIdents;
+          }
+          case (Primitive(Int), Primitive(Char)) => {
+            var rhsType := GenType(toTpe, true, false);
+            var recursiveGen, _, recIdents := GenExpr(expr, selfIdent, params, OwnershipOwned);
+            r := R.RawExpr("char::from_u32(<u32 as ::dafny_runtime::NumCast>::from(" + recursiveGen.ToString(IND) + ").unwrap()).unwrap()");
+            r, resultingOwnership := FromOwned(r, expectedOwnership);
+            readIdents := recIdents;
+          }
+          case (Primitive(Char), Primitive(Int)) => {
+            var rhsType := GenType(fromTpe, true, false);
+            var recursiveGen, _, recIdents := GenExpr(expr, selfIdent, params, OwnershipOwned);
+            r := R.RawExpr("::dafny_runtime::DafnyInt{data: ::BigInt::from(" + recursiveGen.ToString(IND) + " as u32)}");
+            r, resultingOwnership := FromOwned(r, expectedOwnership);
+            readIdents := recIdents;
+          }
+          case (Passthrough(_), Passthrough(_)) => {
+            var recursiveGen, _, recIdents := GenExpr(expr, selfIdent, params, OwnershipOwned);
+            var toTpeGen := GenType(toTpe, true, false);
 
-          isErased := false;
+            r := R.RawExpr("((" + recursiveGen.ToString(IND) + ") as " + toTpeGen.ToString(IND) + ")");
 
+            r, resultingOwnership := FromOwned(r, expectedOwnership);
+            readIdents := recIdents;
+          }
+          case _ => {
+            r, resultingOwnership, readIdents := GenExprConvertNotImplemented(e, selfIdent, params, expectedOwnership);
+          }
+        }
+      }
+      assert OwnershipGuarantee(expectedOwnership, resultingOwnership);
+      return;
+    }
+    method GenExpr(
+      e: Expression,
+      selfIdent: Option<string>,
+      params: seq<string>,
+      expectedOwnership: Ownership
+    ) returns (r: R.Expr, resultingOwnership: Ownership, readIdents: set<string>)
+      ensures OwnershipGuarantee(expectedOwnership, resultingOwnership)
+      decreases e, 1 {
+      match e {
+        case Literal(_) =>
+          r, resultingOwnership, readIdents :=
+            GenExprLiteral(e, selfIdent, params, expectedOwnership);
+        case Ident(name) => {
+          r := R.Identifier(escapeIdent(name));
+          var currentlyBorrowed := name in params; // Otherwise names are owned  // TODO(mikael) have a table to know which names are borrowed
+          if expectedOwnership == OwnershipAutoBorrowed {
+            resultingOwnership := OwnershipOwned;
+            // No need to do anything
+          } else if expectedOwnership == OwnershipBorrowedMut {
+            r := R.BorrowMut(r); // Needs to be explicit for out-parameters on methods
+            resultingOwnership := OwnershipBorrowedMut;
+          } else if expectedOwnership == OwnershipOwned {
+            r := R.Clone(r); // We don't transfer the ownership of an identifier
+            resultingOwnership := OwnershipOwned;
+          } else if currentlyBorrowed {
+            assert expectedOwnership == OwnershipBorrowed;
+            resultingOwnership := OwnershipBorrowed;
+          } else {
+            // It's currently owned.
+            r := R.Borrow(r);
+            resultingOwnership := OwnershipBorrowed;
+          }
           readIdents := {name};
+          return;
         }
         case Companion(path) => {
-          s := GenPath(path);
-          isOwned := true;
-          isErased := true;
+          var p := GenPath(path);
+          r := R.RawExpr(p);
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
           readIdents := {};
+          return;
         }
         case InitializationValue(typ) => {
-          var typString := GenType(typ, false, false);
-          s := "<" + typString + " as std::default::Default>::default()";
-          isOwned := true;
-          isErased := false;
+          var typExpr := GenType(typ, false, false);
+          r := R.RawExpr("<" + typExpr.ToString(IND) + " as std::default::Default>::default()");
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
           readIdents := {};
+          return;
         }
         case Tuple(values) => {
-          s := "(";
+          var s := "(";
           readIdents := {};
 
           var i := 0;
@@ -1724,37 +2742,33 @@ module {:extern "DCOMP"} DCOMP {
               s := s + " ";
             }
 
-            var recursiveGen, _, isErased, recIdents := GenExpr(values[i], selfIdent, params, true);
-            if isErased {
-              recursiveGen := "::dafny_runtime::DafnyUnerasable::<_>::unerase_owned(" + recursiveGen + ")";
-            }
+            var recursiveGen, _, recIdents := GenExpr(values[i], selfIdent, params, OwnershipOwned);
 
-            s := s + recursiveGen + ",";
+            s := s + recursiveGen.ToString(IND) + ",";
             readIdents := readIdents + recIdents;
 
             i := i + 1;
           }
           s := s + ")";
-          isOwned := true;
-          isErased := false;
+          r := R.RawExpr(s);
+
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
+          return;
         }
         case New(path, typeArgs, args) => {
           var path := GenPath(path);
-          s := "::std::rc::Rc::new(" + path;
+          // TODO(Mikael) Use allocate(...) here.
+          var s := "::std::rc::Rc::new(" + path;
           if |typeArgs| > 0 {
-            s := s + "::<";
             var i := 0;
+            var typeExprs := [];
             while i < |typeArgs| {
-              if i > 0 {
-                s := s + "::";
-              }
-
-              var typeString := GenType(typeArgs[i], false, false);
-              s := s + typeString;
+              var typeExpr := GenType(typeArgs[i], false, false);
+              typeExprs := typeExprs + [typeExpr];
 
               i := i + 1;
             }
-            s := s + ">";
+            s := s + R.TypeApp(R.TIdentifier("::"), typeExprs).ToString(IND);
           }
           s := s + "::new(";
           readIdents := {};
@@ -1764,42 +2778,39 @@ module {:extern "DCOMP"} DCOMP {
               s := s + ", ";
             }
 
-            var recursiveGen, _, isErased, recIdents := GenExpr(args[i], selfIdent, params, true);
-            if isErased {
-              recursiveGen := "::dafny_runtime::DafnyUnerasable::<_>::unerase_owned(" + recursiveGen + ")";
-            }
-            s := s + recursiveGen;
+            var recursiveGen, _, recIdents := GenExpr(args[i], selfIdent, params, OwnershipOwned);
+            s := s + recursiveGen.ToString(IND);
             readIdents := readIdents + recIdents;
 
             i := i + 1;
           }
           s := s + "))";
-          isOwned := true;
-          isErased := true;
+          r := R.RawExpr(s);
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
+          return;
         }
         case NewArray(dims, typ) => {
           var i := |dims| - 1;
           var genTyp := GenType(typ, false, false);
-          s := "<" + genTyp + " as ::std::default::Default>::default()";
+          // TODO (Mikael): Prevent arrays from being initialized without initialization code
+          var s := "<" + genTyp.ToString(IND) + " as ::std::default::Default>::default()";
           readIdents := {};
           while i >= 0 {
-            var recursiveGen, _, isErased, recIdents := GenExpr(dims[i], selfIdent, params, true);
-            if !isErased {
-              recursiveGen := "::dafny_runtime::DafnyErasable::erase_owned(" + recursiveGen + ")";
-            }
+            var recursiveGen, _, recIdents := GenExpr(dims[i], selfIdent, params, OwnershipOwned);
 
-            s := "::std::rc::Rc::new(::std::cell::RefCell::new(vec![" + s + "; <usize as ::dafny_runtime::NumCast>::from(" + recursiveGen + ").unwrap()]))";
+            s := "::std::rc::Rc::new(::std::cell::RefCell::new(vec![" + s + "; <usize as ::dafny_runtime::NumCast>::from(" + recursiveGen.ToString(IND) + ").unwrap()]))";
             readIdents := readIdents + recIdents;
 
             i := i - 1;
           }
 
-          isOwned := true;
-          isErased := false;
+          r := R.RawExpr(s);
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
+          return;
         }
         case DatatypeValue(path, typeArgs, variant, isCo, values) => {
           var path := GenPath(path);
-          s := "::std::rc::Rc::new(" + path + "::";
+          var s := "::std::rc::Rc::new(" + path + "::";
           if |typeArgs| > 0 {
             s := s + "<";
             var i := 0;
@@ -1808,8 +2819,8 @@ module {:extern "DCOMP"} DCOMP {
                 s := s + ", ";
               }
 
-              var typeString := GenType(typeArgs[i], false, false);
-              s := s + typeString;
+              var typeExpr := GenType(typeArgs[i], false, false);
+              s := s + typeExpr.ToString(IND);
 
               i := i + 1;
             }
@@ -1827,11 +2838,7 @@ module {:extern "DCOMP"} DCOMP {
             }
 
             if isCo {
-              var recursiveGen, _, isErased, recIdents := GenExpr(value, selfIdent, [], true);
-              if !isErased {
-                recursiveGen := "::dafny_runtime::DafnyErasable::erase_owned(" + recursiveGen + ")";
-              }
-              recursiveGen := "::dafny_runtime::DafnyUnerasable::<_>::unerase_owned(" + recursiveGen + ")";
+              var recursiveGen, _, recIdents := GenExpr(value, selfIdent, [], OwnershipOwned);
 
               readIdents := readIdents + recIdents;
               var allReadCloned := "";
@@ -1840,161 +2847,34 @@ module {:extern "DCOMP"} DCOMP {
                 allReadCloned := allReadCloned + "let " + escapeIdent(next) + " = " + escapeIdent(next) + ".clone();\n";
                 recIdents := recIdents - {next};
               }
-              s := s + escapeIdent(name) + ": ::dafny_runtime::LazyFieldWrapper(::dafny_runtime::Lazy::new(::std::boxed::Box::new({\n" + allReadCloned + "move || (" + recursiveGen + ")})))";
+              s := s + escapeIdent(name) + ": ::dafny_runtime::LazyFieldWrapper(::dafny_runtime::Lazy::new(::std::boxed::Box::new({\n" + allReadCloned + "move || (" + recursiveGen.ToString(IND) + ")})))";
             } else {
-              var recursiveGen, _, isErased, recIdents := GenExpr(value, selfIdent, params, true);
-              if !isErased {
-                recursiveGen := "::dafny_runtime::DafnyErasable::erase_owned(" + recursiveGen + ")";
-              }
-              recursiveGen := "::dafny_runtime::DafnyUnerasable::<_>::unerase_owned(" + recursiveGen + ")";
+              var recursiveGen, _, recIdents := GenExpr(value, selfIdent, params, OwnershipOwned);
 
-              s := s + escapeIdent(name) + ": " + "(" + recursiveGen + ")";
+              s := s + escapeIdent(name) + ": " + "(" + recursiveGen.ToString(IND) + ")";
               readIdents := readIdents + recIdents;
             }
             i := i + 1;
           }
           s := s + " })";
-          isOwned := true;
-          isErased := false;
-        }
-        case Convert(expr, fromTpe, toTpe) => {
-          if fromTpe == toTpe {
-            var recursiveGen, recOwned, recErased, recIdents := GenExpr(expr, selfIdent, params, mustOwn);
-            s := recursiveGen;
-            isOwned := recOwned;
-            isErased := recErased;
-            readIdents := recIdents;
-          } else {
-            match (fromTpe, toTpe) {
-              case (Nullable(_), _) => {
-                var recursiveGen, recOwned, recErased, recIdents := GenExpr(expr, selfIdent, params, mustOwn);
-                if !recOwned {
-                  recursiveGen := recursiveGen + ".as_ref()";
-                }
 
-                s := recursiveGen + ".unwrap()";
-                isOwned := recOwned;
-                isErased := recErased;
-                readIdents := recIdents;
-              }
-              case (_, Nullable(_)) => {
-                var recursiveGen, recOwned, recErased, recIdents := GenExpr(expr, selfIdent, params, mustOwn);
-                if !recOwned {
-                  recursiveGen := recursiveGen + ".clone()";
-                }
-
-                s := "Some(" + recursiveGen + ")";
-                isOwned := true;
-                isErased := recErased;
-                readIdents := recIdents;
-              }
-              case (_, Path(_, _, Newtype(b))) => {
-                if fromTpe == b {
-                  var recursiveGen, recOwned, recErased, recIdents := GenExpr(expr, selfIdent, params, mustOwn);
-
-                  var rhsType := GenType(toTpe, true, false);
-
-                  var uneraseFn := if recOwned then "unerase_owned" else "unerase";
-                  s := "<" + rhsType + " as ::dafny_runtime::DafnyUnerasable<_>>::" + uneraseFn + "(" + recursiveGen + ")";
-                  isOwned := recOwned;
-                  isErased := false;
-                  readIdents := recIdents;
-                } else {
-                  assume {:axiom} Convert(Convert(expr, fromTpe, b), b, toTpe) < e; // make termination go through
-                  s, isOwned, isErased, readIdents := GenExpr(Convert(Convert(expr, fromTpe, b), b, toTpe), selfIdent, params, mustOwn);
-                }
-              }
-              case (Path(_, _, Newtype(b)), _) => {
-                if b == toTpe {
-                  var recursiveGen, recOwned, recErased, recIdents := GenExpr(expr, selfIdent, params, mustOwn);
-                  var uneraseFn := if recOwned then "erase_owned" else "erase";
-                  s := "::dafny_runtime::DafnyErasable::" + uneraseFn + "(" + recursiveGen + ")";
-                  isOwned := recOwned;
-                  isErased := true;
-                  readIdents := recIdents;
-                } else {
-                  assume {:axiom} Convert(Convert(expr, fromTpe, b), b, toTpe) < e; // make termination go through
-                  s, isOwned, isErased, readIdents := GenExpr(Convert(Convert(expr, fromTpe, b), b, toTpe), selfIdent, params, mustOwn);
-                }
-              }
-              case (Primitive(Int), Primitive(Real)) => {
-                var recursiveGen, _, _, recIdents := GenExpr(expr, selfIdent, params, true);
-                s := "::dafny_runtime::BigRational::from_integer(" + recursiveGen + ")";
-                isOwned := true;
-                isErased := true;
-                readIdents := recIdents;
-              }
-              case (Primitive(Real), Primitive(Int)) => {
-                var recursiveGen, _, _, recIdents := GenExpr(expr, selfIdent, params, false);
-                s := "::dafny_runtime::dafny_rational_to_int(" + recursiveGen + ")";
-                isOwned := true;
-                isErased := true;
-                readIdents := recIdents;
-              }
-              case (Primitive(Int), Passthrough(_)) => {
-                var rhsType := GenType(toTpe, true, false);
-                var recursiveGen, _, _, recIdents := GenExpr(expr, selfIdent, params, true);
-                s := "<" + rhsType + " as ::dafny_runtime::NumCast>::from(" + recursiveGen + ").unwrap()";
-                isOwned := true;
-                isErased := true;
-                readIdents := recIdents;
-              }
-              case (Passthrough(_), Primitive(Int)) => {
-                var rhsType := GenType(fromTpe, true, false);
-                var recursiveGen, _, _, recIdents := GenExpr(expr, selfIdent, params, true);
-                s := "::dafny_runtime::BigInt::from(" + recursiveGen + ")";
-                isOwned := true;
-                isErased := true;
-                readIdents := recIdents;
-              }
-              case (Primitive(Int), Primitive(Char)) => {
-                var rhsType := GenType(toTpe, true, false);
-                var recursiveGen, _, _, recIdents := GenExpr(expr, selfIdent, params, true);
-                s := "char::from_u32(<u32 as ::dafny_runtime::NumCast>::from(" + recursiveGen + ").unwrap()).unwrap()";
-                isOwned := true;
-                isErased := true;
-                readIdents := recIdents;
-              }
-              case (Primitive(Char), Primitive(Int)) => {
-                var rhsType := GenType(fromTpe, true, false);
-                var recursiveGen, _, _, recIdents := GenExpr(expr, selfIdent, params, true);
-                s := "::dafny_runtime::BigInt::from(" + recursiveGen + " as u32)";
-                isOwned := true;
-                isErased := true;
-                readIdents := recIdents;
-              }
-              case (Passthrough(_), Passthrough(_)) => {
-                var recursiveGen, _, _, recIdents := GenExpr(expr, selfIdent, params, true);
-                var toTpeGen := GenType(toTpe, true, false);
-
-                s := "((" + recursiveGen + ") as " + toTpeGen + ")";
-
-                isOwned := true;
-                isErased := true;
-                readIdents := recIdents;
-              }
-              case _ => {
-                var recursiveGen, recOwned, recErased, recIdents := GenExpr(expr, selfIdent, params, mustOwn);
-                s := "(" + recursiveGen + "/* conversion not yet implemented */)";
-                isOwned := recOwned;
-                isErased := recErased;
-                readIdents := recIdents;
-              }
-            }
-          }
+          r := R.RawExpr(s);
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
+          return;
+        }
+        case Convert(_, _, _) => {
+          r, resultingOwnership, readIdents :=
+            GenExprConvert(e, selfIdent, params, expectedOwnership);
         }
         case SeqConstruct(length, expr) => {
-          var recursiveGen, _, eErased, recIdents := GenExpr(expr, selfIdent, params, true);
-          var lengthGen, _, lengthErased, lengthIdents := GenExpr(length, selfIdent, params, true);
-          if !lengthErased {
-            lengthGen := "::dafny_runtime::DafnyErasable::erase_owned(" + lengthGen + ")";
-          }
+          var recursiveGen, _, recIdents := GenExpr(expr, selfIdent, params, OwnershipOwned);
+          var lengthGen, _, lengthIdents := GenExpr(length, selfIdent, params, OwnershipOwned);
 
-          s := "{\nlet _initializer = " + recursiveGen + ";\n::dafny_runtime::integer_range(::dafny_runtime::Zero::zero(), " + lengthGen + ").map(|i| _initializer.0(&i)).collect::<Vec<_>>()\n}";
+          r := R.RawExpr("{\nlet _initializer = " + recursiveGen.ToString(IND) + ";\n::dafny_runtime::integer_range(::dafny_runtime::Zero::zero(), " + lengthGen.ToString(IND) + ").map(|i| _initializer.0(&i)).collect::<::dafny_runtime::Sequence<_>>()\n}");
 
           readIdents := recIdents + lengthIdents;
-          isOwned := true;
-          isErased := eErased;
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
+          return;
         }
         case SeqValue(exprs, typ) => {
           readIdents := {};
@@ -2002,295 +2882,222 @@ module {:extern "DCOMP"} DCOMP {
           var genTpe := GenType(typ, false, false);
 
           var i := 0;
-          s := "(vec![";
-          i := 0;
+          var args := [];
           while i < |exprs| {
-            if i > 0 {
-              s := s + ", ";
-            }
-
-            var recursiveGen, _, isErased, recIdents := GenExpr(exprs[i], selfIdent, params, true);
+            var recursiveGen, _, recIdents := GenExpr(exprs[i], selfIdent, params, OwnershipOwned);
             readIdents := readIdents + recIdents;
+            args := args + [recursiveGen];
 
-            if isErased {
-              recursiveGen := "::dafny_runtime::DafnyUnerasable::<_>::unerase_owned(" + recursiveGen + ")";
-            }
-
-            s := s + recursiveGen;
             i := i + 1;
           }
-          s := s + "] as Vec<" + genTpe + ">)";
-
-          isOwned := true;
-          isErased := false;
+          r := R.dafny_runtime.MSel("seq!").Apply([], args);
+          if |args| == 0 {
+            r := R.TypeAscription(r,
+                                  R.dafny_runtime_type.MSel("Sequence").Apply1(genTpe));
+          }
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
+          return;
         }
         case SetValue(exprs) => {
           var generatedValues := [];
           readIdents := {};
           var i := 0;
-          var allErased := true;
           while i < |exprs| {
-            var recursiveGen, _, isErased, recIdents := GenExpr(exprs[i], selfIdent, params, true);
-            allErased := allErased && isErased;
+            var recursiveGen, _, recIdents := GenExpr(exprs[i], selfIdent, params, OwnershipOwned);
 
-            generatedValues := generatedValues + [(recursiveGen, isErased)];
+            generatedValues := generatedValues + [recursiveGen];
             readIdents := readIdents + recIdents;
             i := i + 1;
           }
+          r := R.dafny_runtime.MSel("set!").Apply([], generatedValues);
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
+          return;
+        }
+        case MultisetValue(exprs) => {
+          var generatedValues := [];
+          readIdents := {};
+          var i := 0;
+          while i < |exprs| {
+            var recursiveGen, _, recIdents := GenExpr(exprs[i], selfIdent, params, OwnershipOwned);
 
-          s := "vec![";
-          i := 0;
-          while i < |generatedValues| {
-            if i > 0 {
-              s := s + ", ";
-            }
-
-            var gen := generatedValues[i].0;
-            if generatedValues[i].1 && !allErased {
-              gen := "::dafny_runtime::DafnyUnerasable::<_>::unerase_owned(" + gen + ")";
-            }
-
-            s := s + gen;
+            generatedValues := generatedValues + [recursiveGen];
+            readIdents := readIdents + recIdents;
             i := i + 1;
           }
-          s := s + "].into_iter().collect::<std::collections::HashSet<_>>()";
-
-          isOwned := true;
-          isErased := allErased;
+          r := R.dafny_runtime.MSel("multiset!").Apply([], generatedValues);
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
+          return;
+        }
+        case ToMultiset(expr) => {
+          var recursiveGen, _, recIdents := GenExpr(expr, selfIdent, params, OwnershipAutoBorrowed);
+          r := recursiveGen.Sel("as_dafny_multiset").Apply([], []);
+          readIdents := recIdents;
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
+          return;
         }
         case MapValue(mapElems) => {
           var generatedValues := [];
           readIdents := {};
           var i := 0;
-          var allErased := true;
           while i < |mapElems| {
-            var recursiveGenKey, _, isErasedKey, recIdentsKey := GenExpr(mapElems[i].0, selfIdent, params, true);
-            var recursiveGenValue, _, isErasedValue, recIdentsValue := GenExpr(mapElems[i].1, selfIdent, params, true);
-            allErased := allErased && isErasedKey && isErasedValue;
+            var recursiveGenKey, _, recIdentsKey := GenExpr(mapElems[i].0, selfIdent, params, OwnershipOwned);
+            var recursiveGenValue, _, recIdentsValue := GenExpr(mapElems[i].1, selfIdent, params, OwnershipOwned);
 
-            generatedValues := generatedValues + [(recursiveGenKey, recursiveGenValue, isErasedKey, isErasedValue)];
+            generatedValues := generatedValues + [(recursiveGenKey, recursiveGenValue)];
             readIdents := readIdents + recIdentsKey + recIdentsValue;
             i := i + 1;
           }
 
-          s := "vec![";
           i := 0;
+          var arguments := [];
           while i < |generatedValues| {
-            if i > 0 {
-              s := s + ", ";
-            }
-
             var genKey := generatedValues[i].0;
             var genValue := generatedValues[i].1;
-            if generatedValues[i].2 && !allErased {
-              genKey := "::dafny_runtime::DafnyUnerasable::<_>::unerase_owned(" + genKey + ")";
-            }
-            if generatedValues[i].3 && !allErased {
-              genValue := "::dafny_runtime::DafnyUnerasable::<_>::unerase_owned(" + genValue + ")";
-            }
 
-            s := s + "(" + genKey + ", " + genValue + ")";
+            arguments := arguments + [R.BinaryOp("=>", genKey, genValue, DAST.Format.BinaryOpFormat.NoFormat())];
             i := i + 1;
           }
-          s := s + "].into_iter().collect::<std::collections::HashMap<_, _>>()";
-
-          isOwned := true;
-          isErased := allErased;
+          r := R.dafny_runtime.MSel("map!").Apply([],
+                                                  arguments
+          );
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
+          return;
+        }
+        case SeqUpdate(expr, index, value) => {
+          var exprR, _, exprIdents := GenExpr(expr, selfIdent, params, OwnershipAutoBorrowed);
+          var indexR, indexOwnership, indexIdents := GenExpr(index, selfIdent, params, OwnershipBorrowed);
+          var valueR, valueOwnership, valueIdents := GenExpr(value, selfIdent, params, OwnershipBorrowed);
+          r := exprR.Sel("update_index").Apply([], [indexR, valueR]);
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
+          readIdents := exprIdents + indexIdents + valueIdents;
+          return;
+        }
+        case MapUpdate(expr, index, value) => {
+          var exprR, _, exprIdents := GenExpr(expr, selfIdent, params, OwnershipAutoBorrowed);
+          var indexR, indexOwnership, indexIdents := GenExpr(index, selfIdent, params, OwnershipBorrowed);
+          var valueR, valueOwnership, valueIdents := GenExpr(value, selfIdent, params, OwnershipBorrowed);
+          r := exprR.Sel("update_index").Apply([], [indexR, valueR]);
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
+          readIdents := exprIdents + indexIdents + valueIdents;
+          return;
         }
         case This() => {
           match selfIdent {
             case Some(id) => {
-              if mustOwn {
-                s := id + ".clone()";
-                isOwned := true;
+              r := R.RawExpr(id);
+              if expectedOwnership == OwnershipOwned {
+                r := R.Clone(r);
+                resultingOwnership := OwnershipOwned;
+              } else if expectedOwnership == OwnershipBorrowed || expectedOwnership == OwnershipAutoBorrowed {
+                if id != "self" {
+                  r := R.Borrow(r);
+                }
+                resultingOwnership := OwnershipBorrowed;
               } else {
-                if id == "self" {
-                  s := "self";
-                } else {
-                  s := "&" + id;
+                assert expectedOwnership == OwnershipBorrowedMut;
+                if id != "self" {
+                  r := R.BorrowMut(r);
                 }
-                isOwned := false;
+                resultingOwnership := OwnershipBorrowedMut;
               }
 
               readIdents := {id};
-              isErased := false;
             }
             case None => {
-              s := "panic!(\"this outside of a method\")";
-              isOwned := true;
+              r := R.RawExpr("panic!(\"this outside of a method\")");
+              r, resultingOwnership := FromOwned(r, expectedOwnership);
               readIdents := {};
-              isErased := true;
             }
           }
+          return;
         }
         case Ite(cond, t, f) => {
-          var condString, _, condErased, recIdentsCond := GenExpr(cond, selfIdent, params, true);
-          if !condErased {
-            condString := "::dafny_runtime::DafnyErasable::erase_owned(" + condString + ")";
-          }
+          assert {:split_here} true;
+          var cond, _, recIdentsCond := GenExpr(cond, selfIdent, params, OwnershipOwned);
+          var condString := cond.ToString(IND);
 
-          var _, tHasToBeOwned, _, _ := GenExpr(t, selfIdent, params, mustOwn); // check if t has to be owned even if not requested
-          var fString, fOwned, fErased, recIdentsF := GenExpr(f, selfIdent, params, tHasToBeOwned);
-          var tString, _, tErased, recIdentsT := GenExpr(t, selfIdent, params, fOwned); // there's a chance that f forced ownership
+          var _, tHasToBeOwned, _ := GenExpr(t, selfIdent, params, expectedOwnership); // check if t has to be owned even if not requested
+          var fExpr, fOwned, recIdentsF := GenExpr(f, selfIdent, params, tHasToBeOwned);
+          var fString := fExpr.ToString(IND);
+          var tExpr, _, recIdentsT := GenExpr(t, selfIdent, params, fOwned); // there's a chance that f forced ownership
+          var tString := tExpr.ToString(IND);
 
-          if !fErased || !tErased {
-            if fErased {
-              fString := "::dafny_runtime::DafnyErasable::erase_owned(" + fString + ")";
-            }
+          r := R.RawExpr("(if " + condString + " {\n" + tString + "\n} else {\n" + fString + "\n})");
 
-            if tErased {
-              tString := "::dafny_runtime::DafnyErasable::erase_owned(" + tString + ")";
-            }
-          }
-
-          s := "(if " + condString + " {\n" + tString + "\n} else {\n" + fString + "\n})";
-          isOwned := fOwned;
+          r, resultingOwnership := FromOwnership(r, fOwned, expectedOwnership);
           readIdents := recIdentsCond + recIdentsT + recIdentsF;
-          isErased := fErased || tErased;
+          return;
         }
-        case UnOp(Not, e) => {
-          var recursiveGen, _, recErased, recIdents := GenExpr(e, selfIdent, params, true);
-          if !recErased {
-            recursiveGen := "::dafny_runtime::DafnyErasable::erase_owned(" + recursiveGen + ")";
-          }
+        case UnOp(Not, e, format) => {
+          var recursiveGen, _, recIdents := GenExpr(e, selfIdent, params, OwnershipOwned);
 
-          s := "!(" + recursiveGen + ")";
-          isOwned := true;
+          r := R.UnaryOp("!", recursiveGen, format);
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
           readIdents := recIdents;
-          isErased := true;
+          return;
         }
-        case UnOp(BitwiseNot, e) => {
-          var recursiveGen, _, recErased, recIdents := GenExpr(e, selfIdent, params, true);
-          if !recErased {
-            recursiveGen := "::dafny_runtime::DafnyErasable::erase_owned(" + recursiveGen + ")";
-          }
+        case UnOp(BitwiseNot, e, format) => {
+          var recursiveGen, _, recIdents := GenExpr(e, selfIdent, params, OwnershipOwned);
 
-          s := "~(" + recursiveGen + ")";
-          isOwned := true;
+          r := R.UnaryOp("~", recursiveGen, format);
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
           readIdents := recIdents;
-          isErased := true;
+          return;
         }
-        case UnOp(Cardinality, e) => {
-          var recursiveGen, recOwned, recErased, recIdents := GenExpr(e, selfIdent, params, false);
-          if !recErased {
-            var eraseFn := if recOwned then "erase_owned" else "erase";
-            recursiveGen := "::dafny_runtime::DafnyErasable::" + eraseFn + "(" + recursiveGen + ")";
-          }
+        case UnOp(Cardinality, e, format) => {
+          var recursiveGen, recOwned, recIdents := GenExpr(e, selfIdent, params, OwnershipAutoBorrowed);
 
-          s := "::dafny_runtime::BigInt::from((" + recursiveGen + ").len())";
-          isOwned := true;
+          r := recursiveGen.Sel("cardinality").Apply([], []);
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
           readIdents := recIdents;
-          isErased := true;
-        }
-        case BinOp(op, l, r) => {
-          var left, _, leftErased, recIdentsL := GenExpr(l, selfIdent, params, true);
-          var right, _, rightErased, recIdentsR := GenExpr(r, selfIdent, params, true);
-
-          match op {
-            case Implies() => {
-              if !leftErased {
-                left := "::dafny_runtime::DafnyErasable::erase_owned(" + left + ")";
-              }
-              if !rightErased {
-                right := "::dafny_runtime::DafnyErasable::erase_owned(" + right + ")";
-              }
-              s := "!(" + left + ") || " + right;
-            }
-            case In() => {
-              s := right + ".contains(&" + left + ")";
-            }
-            case NotIn() => {
-              s := "!(" + right + ".contains(&" + left + "))";
-            }
-            case SetDifference() => {
-              s := left + ".difference(&" + right + ").cloned().collect::<::std::collections::HashSet<_>>()";
-            }
-            case Concat() => {
-              s := "[" + left + ", " + right + "].concat()";
-            }
-            case _ => {
-              if !leftErased {
-                left := "::dafny_runtime::DafnyErasable::erase_owned(" + left + ")";
-              }
-
-              if !rightErased {
-                right := "::dafny_runtime::DafnyErasable::erase_owned(" + right + ")";
-              }
-
-              match op {
-                case Eq(referential, nullable) => {
-                  if (referential) {
-                    if (nullable) {
-                      s := "::dafny_runtime::nullable_referential_equality(" + left + ", " + right + ")";
-                    } else {
-                      s := "::std::rc::Rc::ptr_eq(&(" + left + "), &(" + right + "))";
-                    }
-                  } else {
-                    s := left + " == " + right;
-                  }
-                }
-                case Neq(referential, nullable) => {
-                  if (referential) {
-                    if (nullable) {
-                      s := "!::dafny_runtime::nullable_referential_equality(" + left + ", " + right + ")";
-                    } else {
-                      s := "!::std::rc::Rc::ptr_eq(&(" + left + "), &(" + right + "))";
-                    }
-                  } else {
-                    s := left + " != " + right;
-                  }
-                }
-                case EuclidianDiv() => {
-                  s := "::dafny_runtime::euclidian_division(" + left + ", " + right + ")";
-                }
-                case Div() => {
-                  s := "(" + left + ") / (" + right + ")";
-                }
-                case EuclidianMod() => {
-                  s := "::dafny_runtime::euclidian_modulo(" + left + ", " + right + ")";
-                }
-                case Mod() => {
-                  s := "(" + left + ") % (" + right + ")";
-                }
-                case Passthrough(op) => {
-                  s := "(" + left + " " + op + " " + right + ")";
-                }
-              }
-            }
-          }
-
-          isOwned := true;
-          readIdents := recIdentsL + recIdentsR;
-          isErased := true;
+          return;
         }
+        case BinOp(_, _, _, _) =>
+          r, resultingOwnership, readIdents :=
+            GenExprBinary(e, selfIdent, params, expectedOwnership);
         case ArrayLen(expr, dim) => {
-          var recursiveGen, _, recErased, recIdents := GenExpr(expr, selfIdent, params, true);
+          var recursiveGen, _, recIdents := GenExpr(expr, selfIdent, params, OwnershipOwned);
 
           if dim == 0 {
-            s := "::dafny_runtime::BigInt::from((" + recursiveGen + ").borrow().len())";
+            r := R.RawExpr("::dafny_runtime::BigInt::from((" + recursiveGen.ToString(IND) + ").borrow().len())");
           } else {
-            s := "::dafny_runtime::BigInt::from(m.borrow().len())";
+            var s := R.RawExpr("::dafny_runtime::BigInt::from(m.borrow().len())").ToString(IND);
             var i := 1;
             while i < dim {
               s := "m.borrow().get(0).map(|m| " + s + ").unwrap_or(::dafny_runtime::BigInt::from(0))";
               i := i + 1;
             }
 
-            s := "(" + recursiveGen + ")" + ".borrow().get(0).map(|m| " + s + ").unwrap_or(::dafny_runtime::BigInt::from(0))";
+            r := R.RcNew(R.RawExpr("(" + recursiveGen.ToString(IND) + ")" + ".borrow().get(0).map(|m| " + s + ").unwrap_or(::dafny_runtime::BigInt::from(0))"));
           }
-
-          isOwned := true;
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
+          readIdents := recIdents;
+          return;
+        }
+        case MapKeys(expr) => {
+          var recursiveGen, _, recIdents := GenExpr(expr, selfIdent, params, OwnershipOwned);
+          readIdents := recIdents;
+          r := R.Call(recursiveGen.Sel("keys"), [], []);
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
+          return;
+        }
+        case MapValues(expr) => {
+          var recursiveGen, _, recIdents := GenExpr(expr, selfIdent, params, OwnershipOwned);
           readIdents := recIdents;
-          isErased := true;
+          r := R.Call(recursiveGen.Sel("values"), [], []);
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
+          return;
         }
         case SelectFn(on, field, isDatatype, isStatic, arity) => {
-          var onString, onOwned, _, recIdents := GenExpr(on, selfIdent, params, false);
+          var onExpr, onOwned, recIdents := GenExpr(on, selfIdent, params, OwnershipBorrowed);
+          var s: string;
+          var onString := onExpr.ToString(IND);
 
           if isStatic {
             s := onString + "::" + escapeIdent(field);
           } else {
             s := "{\n";
-            s := s + "let callTarget = (" + onString + (if onOwned then ")" else ").clone()") + ";\n";
+            s := s + "let callTarget = (" + onString + (if onOwned == OwnershipOwned then ")" else ").clone()") + ";\n";
             var args := "";
             var i := 0;
             while i < arity {
@@ -2319,207 +3126,144 @@ module {:extern "DCOMP"} DCOMP {
           typeShape := typeShape + ") -> _";
 
           s := "::dafny_runtime::FunctionWrapper(::std::rc::Rc::new(" + s + ") as ::std::rc::Rc<" + typeShape + ">)";
-
-          isOwned := true;
-          isErased := false;
+          r := R.RawExpr(s);
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
           readIdents := recIdents;
+          return;
         }
         case Select(Companion(c), field, isConstant, isDatatype) => {
-          var onString, onOwned, onErased, recIdents := GenExpr(Companion(c), selfIdent, params, false);
+          var onExpr, onOwned, recIdents := GenExpr(Companion(c), selfIdent, params, OwnershipBorrowed);
 
-          s := onString + "::" + escapeIdent(field) + "()";
+          r := R.RawExpr(onExpr.ToString(IND) + "::" + escapeIdent(field) + "()");
 
-          isOwned := true;
-          isErased := false;
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
           readIdents := recIdents;
+          return;
         }
         case Select(on, field, isConstant, isDatatype) => {
-          var onString, onOwned, onErased, recIdents := GenExpr(on, selfIdent, params, false);
+          var onExpr, onOwned, recIdents := GenExpr(on, selfIdent, params, OwnershipBorrowed);
           if isDatatype || isConstant {
-            s := "(" + onString + ")" + "." + escapeIdent(field) + "()";
-            if isConstant {
-              s := "&" + s;
-            }
-
-            if mustOwn {
-              s := "(" + s + ").clone()";
-              isOwned := true;
-            } else {
-              isOwned := false;
-            }
+            r := R.Call(onExpr.Sel(escapeIdent(field)), [], []);
+            r, resultingOwnership := FromOwned(r, expectedOwnership);
           } else {
-            s := "::std::ops::Deref::deref(&((" + onString + ")" + "." + escapeIdent(field) + ".borrow()))";
-            s := "(" + s + ").clone()"; // TODO(shadaj): think through when we can avoid cloning
-            isOwned := true;
+            var s: string;
+            s := "::std::ops::Deref::deref(&((" + onExpr.ToString(IND) + ")" + "." + escapeIdent(field) + ".borrow()))";
+            r, resultingOwnership := FromOwnership(R.RawExpr(s), OwnershipBorrowed, expectedOwnership);
           }
-
-          isErased := false;
           readIdents := recIdents;
+          return;
         }
         case Index(on, collKind, indices) => {
-          var onString, onOwned, onErased, recIdents := GenExpr(on, selfIdent, params, false);
+          assert {:split_here} true;
+          var onExpr, onOwned, recIdents := GenExpr(on, selfIdent, params, OwnershipAutoBorrowed);
           readIdents := recIdents;
-          // if !onErased {
-          //   var eraseFn := if onOwned then "erase_owned" else "erase";
-          //   onString := "::dafny_runtime::DafnyErasable::" + eraseFn + "(" + onString + ")";
-          // }
-
-          s := onString;
+          r := onExpr;
 
           var i := 0;
           while i < |indices| {
             if collKind == CollKind.Array {
-              s := "(" + s + ").borrow()";
+              r := r.Sel("borrow").Apply([], []);
             }
-
-            if collKind == CollKind.Map {
-              var idx, idxOwned, idxErased, recIdentsIdx := GenExpr(indices[i], selfIdent, params, false);
-              s := "(" + s + ")[" + (if idxOwned then "&" else "") + idx + "]";
-              readIdents := readIdents + recIdentsIdx;
-            } else {
-              var idx, _, idxErased, recIdentsIdx := GenExpr(indices[i], selfIdent, params, true);
-              if !idxErased {
-                idx := "::dafny_runtime::DafnyErasable::erase_owned(" + idx + ")";
-              }
-
-              s := "(" + s + ")[<usize as ::dafny_runtime::NumCast>::from(" + idx + ").unwrap()]";
-              readIdents := readIdents + recIdentsIdx;
-            }
-
+            var idx, idxOwned, recIdentsIdx := GenExpr(indices[i], selfIdent, params, OwnershipBorrowed);
+            r := r.Sel("get").Apply1(idx);
+            readIdents := readIdents + recIdentsIdx;
             i := i + 1;
           }
-
-          if mustOwn {
-            s := "(" + s + ").clone()";
-            isOwned := true;
-          } else {
-            s := "(&" + s + ")";
-            isOwned := false;
-          }
-
-          isErased := onErased;
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
+          return;
         }
         case IndexRange(on, isArray, low, high) => {
-          var onString, onOwned, onErased, recIdents := GenExpr(on, selfIdent, params, false);
+          var onExpr, onOwned, recIdents := GenExpr(on, selfIdent, params, OwnershipAutoBorrowed);
           readIdents := recIdents;
 
-          s := onString;
+          var methodName := if low.Some? then
+            if high.Some? then "slice" else "drop"
+          else if high.Some? then "take" else "";
 
-          var lowString := None;
+          var arguments := [];
           match low {
             case Some(l) => {
-              var lString, _, lErased, recIdentsL := GenExpr(l, selfIdent, params, true);
-              if !lErased {
-                lString := "::dafny_runtime::DafnyErasable::erase_owned(" + lString + ")";
-              }
-
-              lowString := Some(lString);
+              var lExpr, _, recIdentsL := GenExpr(l, selfIdent, params, OwnershipBorrowed);
+              arguments := arguments + [lExpr];
               readIdents := readIdents + recIdentsL;
             }
             case None => {}
           }
 
-          var highString := None;
           match high {
             case Some(h) => {
-              var hString, _, hErased, recIdentsH := GenExpr(h, selfIdent, params, true);
-              if !hErased {
-                hString := "::dafny_runtime::DafnyErasable::erase_owned(" + hString + ")";
-              }
-
-              highString := Some(hString);
+              var hExpr, _, recIdentsH := GenExpr(h, selfIdent, params, OwnershipBorrowed);
+              arguments := arguments + [hExpr];
               readIdents := readIdents + recIdentsH;
             }
             case None => {}
           }
 
+          r := onExpr;
           if isArray {
-            s := "(" + s + ").borrow()";
+            if methodName != "" {
+              methodName := "_" + methodName;
+            }
+            r := R.dafny_runtime_Sequence.MSel("from_array"+methodName).Apply([], arguments);
+          } else {
+            if methodName != "" {
+              r := r.Sel(methodName).Apply([], arguments);
+            }
           }
-
-          s := "(" + s + ")" + "[" + (match lowString {
-                                        case Some(l) => "<usize as ::dafny_runtime::NumCast>::from(" + l + ").unwrap()"
-                                        case None => ""
-                                      }) + ".." + (match highString {
-                                                     case Some(h) => "<usize as ::dafny_runtime::NumCast>::from(" + h + ").unwrap()"
-                                                     case None => ""
-                                                   }) + "]";
-
-          isErased := onErased;
-
-          s := "(" + s + ".to_vec())";
-          isOwned := true;
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
+          return;
         }
         case TupleSelect(on, idx) => {
-          var onString, _, tupErased, recIdents := GenExpr(on, selfIdent, params, false);
-          s := "(" + onString + ")." + Strings.OfNat(idx);
-          if mustOwn {
-            s := "(" + s + ")" + ".clone()";
-            isOwned := true;
-          } else {
-            s := "&" + s;
-            isOwned := false;
-          }
-          isErased := tupErased;
+          var onExpr, onOwnership, recIdents := GenExpr(on, selfIdent, params, OwnershipAutoBorrowed);
+          r := onExpr.Sel(Strings.OfNat(idx));
+          r, resultingOwnership := FromOwnership(r, onOwnership, expectedOwnership);
           readIdents := recIdents;
+          return;
         }
         case Call(on, name, typeArgs, args) => {
           readIdents := {};
 
-          var typeArgString := "";
+          var typeExprs := [];
           if (|typeArgs| >= 1) {
             var typeI := 0;
-            typeArgString := "::<";
             while typeI < |typeArgs| {
-              if typeI > 0 {
-                typeArgString := typeArgString + ", ";
-              }
 
-              var typeString := GenType(typeArgs[typeI], false, false);
-              typeArgString := typeArgString + typeString;
+              var typeExpr := GenType(typeArgs[typeI], false, false);
+              typeExprs := typeExprs + [typeExpr];
 
               typeI := typeI + 1;
             }
-            typeArgString := typeArgString + ">";
           }
 
-          var argString := "";
+          var argExprs := [];
           var i := 0;
           while i < |args| {
-            if i > 0 {
-              argString := argString + ", ";
-            }
-
-            var argExpr, isOwned, argErased, argIdents := GenExpr(args[i], selfIdent, params, false);
-            if isOwned {
-              argExpr := "&(" + argExpr + ")";
-            }
-
-            if !argErased {
-              argExpr := "::dafny_runtime::DafnyErasable::erase(" + argExpr + ")";
-            }
-            argExpr := "::dafny_runtime::DafnyUnerasable::unerase(" + argExpr + ")";
-
-            argString := argString + argExpr;
+            var argExpr, argOwnership, argIdents := GenExpr(args[i], selfIdent, params, OwnershipBorrowed);
+            argExprs := argExprs + [argExpr];
             readIdents := readIdents + argIdents;
 
             i := i + 1;
           }
 
-          var enclosingString, _, _, recIdents := GenExpr(on, selfIdent, params, false);
+          var onExpr, _, recIdents := GenExpr(on, selfIdent, params, OwnershipAutoBorrowed);
           readIdents := readIdents + recIdents;
+          var renderedName := match name {
+            case Name(ident) => escapeIdent(ident)
+            case MapBuilderAdd | SetBuilderAdd => "add"
+            case MapBuilderBuild | SetBuilderBuild => "build"
+          };
           match on {
             case Companion(_) => {
-              enclosingString := enclosingString + "::" + escapeIdent(name.id);
+              onExpr := onExpr.MSel(renderedName);
             }
             case _ => {
-              enclosingString := "(" + enclosingString + ")." + escapeIdent(name.id);
+              onExpr := onExpr.Sel(renderedName);
             }
           }
 
-          s := enclosingString + typeArgString + "(" + argString + ")";
-          isOwned := true;
-          isErased := false;
+          r := R.Call(onExpr, typeExprs, argExprs);
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
+          return;
         }
         case Lambda(params, retType, body) => {
           var paramNames := [];
@@ -2529,7 +3273,7 @@ module {:extern "DCOMP"} DCOMP {
             i := i + 1;
           }
 
-          var recursiveGen, recIdents := GenStmts(body, if selfIdent != None then Some("_this") else None, paramNames, true, "");
+          var recursiveGen, recIdents := GenStmts(body, if selfIdent != None then Some("_this") else None, paramNames, true, R.RawExpr(""));
           readIdents := {};
           var allReadCloned := "";
           while recIdents != {} decreases recIdents {
@@ -2558,16 +3302,16 @@ module {:extern "DCOMP"} DCOMP {
 
             var typStr := GenType(params[i].typ, false, true);
 
-            paramsString := paramsString + escapeIdent(params[i].name) + ": &" + typStr;
-            paramTypes := paramTypes + "&" + typStr;
+            paramsString := paramsString + escapeIdent(params[i].name) + ": " + R.Borrowed(typStr).ToString(IND);
+            paramTypes := paramTypes + R.Borrowed(typStr).ToString(IND);
             i := i + 1;
           }
 
           var retTypeGen := GenType(retType, false, true);
 
-          s := "::dafny_runtime::FunctionWrapper::<::std::rc::Rc<dyn ::std::ops::Fn(" + paramTypes + ") -> " + retTypeGen + ">>({\n" + allReadCloned + "::std::rc::Rc::new(move |" + paramsString + "| -> " + retTypeGen + " {\n" + recursiveGen + "\n})})";
-          isOwned := true;
-          isErased := false;
+          r := R.RawExpr("::dafny_runtime::FunctionWrapper::<::std::rc::Rc<dyn ::std::ops::Fn(" + paramTypes + ") -> " + retTypeGen.ToString(IND) + ">>({\n" + allReadCloned + "::std::rc::Rc::new(move |" + paramsString + "| -> " + retTypeGen.ToString(IND) + " {\n" + recursiveGen.ToString(IND) + "\n})})");
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
+          return;
         }
         case BetaRedex(values, retType, expr) => {
           var paramNames := [];
@@ -2580,7 +3324,7 @@ module {:extern "DCOMP"} DCOMP {
           }
 
           readIdents := {};
-          s := "{\n";
+          var s := "{\n";
 
           var paramsString := "";
           i := 0;
@@ -2591,41 +3335,36 @@ module {:extern "DCOMP"} DCOMP {
 
             var typStr := GenType(values[i].0.typ, false, true);
 
-            var valueGen, _, valueErased, recIdents := GenExpr(values[i].1, selfIdent, params, true);
-            s := s + "let " + escapeIdent(values[i].0.name) + ": " + typStr + " = ";
+            var valueGen, _, recIdents := GenExpr(values[i].1, selfIdent, params, OwnershipOwned);
+            s := s + "let " + escapeIdent(values[i].0.name) + ": " + typStr.ToString(IND) + " = ";
             readIdents := readIdents + recIdents;
-            if valueErased {
-              valueGen := "::dafny_runtime::DafnyUnerasable::<_>::unerase_owned" + "(" + valueGen + ")";
-            }
 
-            s := s + valueGen + ";\n";
+            s := s + valueGen.ToString(IND) + ";\n";
             i := i + 1;
           }
 
-          var recGen, recOwned, recErased, recIdents := GenExpr(expr, selfIdent, paramNames, mustOwn);
+          var recGen, recOwned, recIdents := GenExpr(expr, selfIdent, paramNames, expectedOwnership);
           readIdents := recIdents - paramNamesSet;
 
-          s := s  + recGen + "\n}";
-          isOwned := recOwned;
-          isErased := recErased;
+          s := s  + recGen.ToString(IND) + "\n}";
+          r := R.RawExpr(s);
+          r, resultingOwnership := FromOwnership(r, recOwned, expectedOwnership);
+          return;
         }
         case IIFE(name, tpe, value, iifeBody) => {
-          var valueGen, _, valueErased, recIdents := GenExpr(value, selfIdent, params, true);
-          if valueErased {
-            valueGen := "::dafny_runtime::DafnyUnerasable::<_>::unerase_owned" + "(" + valueGen + ")";
-          }
+          var valueGen, _, recIdents := GenExpr(value, selfIdent, params, OwnershipOwned);
 
           readIdents := recIdents;
           var valueTypeGen := GenType(tpe, false, true);
-          var bodyGen, _, bodyErased, bodyIdents := GenExpr(iifeBody, selfIdent, params, true);
+          var bodyGen, _, bodyIdents := GenExpr(iifeBody, selfIdent, params, OwnershipOwned);
           readIdents := readIdents + (bodyIdents - {name.id});
 
-          s := "{\nlet " + escapeIdent(name.id) + ": " + valueTypeGen + " = " + valueGen + ";\n" + bodyGen + "\n}";
-          isOwned := true;
-          isErased := bodyErased;
+          r := R.RawExpr("{\nlet " + escapeIdent(name.id) + ": " + valueTypeGen.ToString(IND) + " = " + valueGen.ToString(IND) + ";\n" + bodyGen.ToString(IND) + "\n}");
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
+          return;
         }
         case Apply(func, args) => {
-          var funcString, _, funcErased, recIdents := GenExpr(func, selfIdent, params, false);
+          var funcExpr, _, recIdents := GenExpr(func, selfIdent, params, OwnershipBorrowed);
           readIdents := recIdents;
 
           var argString := "";
@@ -2635,73 +3374,82 @@ module {:extern "DCOMP"} DCOMP {
               argString := argString + ", ";
             }
 
-            var argExpr, isOwned, argErased, argIdents := GenExpr(args[i], selfIdent, params, false);
-            if isOwned {
-              argExpr := "&" + argExpr;
+            var argExpr, argOwned, argIdents := GenExpr(args[i], selfIdent, params, OwnershipBorrowed);
+            var argExprString := argExpr.ToString(IND);
+            if argOwned == OwnershipOwned {
+              argExprString := "&" + argExprString;
             }
 
-            argString := argString + argExpr;
+            argString := argString + argExprString;
             readIdents := readIdents + argIdents;
 
             i := i + 1;
           }
 
-          s := "((" + funcString + ").0" + "(" + argString + "))";
-          isOwned := true;
-          isErased := false;
+          r := R.RawExpr("((" + funcExpr.ToString(IND) + ").0" + "(" + argString + "))");
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
+          return;
         }
         case TypeTest(on, dType, variant) => {
-          var exprGen, _, exprErased, recIdents := GenExpr(on, selfIdent, params, false);
+          var exprGen, _, recIdents := GenExpr(on, selfIdent, params, OwnershipBorrowed);
           var dTypePath := GenPath(dType);
-          s := "matches!(" + exprGen + ".as_ref(), " + dTypePath + "::" + escapeIdent(variant) + "{ .. })";
-          isOwned := true;
-          isErased := true;
+          r := R.RawExpr("matches!(" + exprGen.ToString(IND) + ".as_ref(), " + dTypePath + "::" + escapeIdent(variant) + "{ .. })");
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
           readIdents := recIdents;
+          return;
         }
         case BoolBoundedPool() => {
-          s := "[false, true]";
-          isOwned := true;
-          isErased := true;
+          r := R.RawExpr("[false, true]");
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
           readIdents := {};
+          return;
         }
         case SetBoundedPool(of) => {
-          var exprGen, _, exprErased, recIdents := GenExpr(of, selfIdent, params, false);
-          s := "(" + exprGen + ").iter()";
-          isOwned := true;
-          isErased := exprErased;
+          var exprGen, _, recIdents := GenExpr(of, selfIdent, params, OwnershipBorrowed);
+          r := R.RawExpr("(" + exprGen.ToString(IND) + ").iter()");
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
           readIdents := recIdents;
+          return;
         }
         case SeqBoundedPool(of, includeDuplicates) => {
-          var exprGen, _, exprErased, recIdents := GenExpr(of, selfIdent, params, false);
-          s := "(" + exprGen + ").iter()";
+          var exprGen, _, recIdents := GenExpr(of, selfIdent, params, OwnershipBorrowed);
+          var s := "(" + exprGen.ToString(IND) + ").iter()";
           if !includeDuplicates {
             s := "::dafny_runtime::itertools::Itertools::unique(" + s + ")";
           }
-          isOwned := true;
-          isErased := exprErased;
+          r := R.RawExpr(s);
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
           readIdents := recIdents;
+          return;
         }
         case IntRange(lo, hi) => {
-          var loString, _, loErased, recIdentsLo := GenExpr(lo, selfIdent, params, true);
-          var hiString, _, hiErased, recIdentsHi := GenExpr(hi, selfIdent, params, true);
-
-          if !loErased {
-            loString := "::dafny_runtime::DafnyErasable::erase_owned(" + loString + ")";
-          }
-
-          if !hiErased {
-            hiString := "::dafny_runtime::DafnyErasable::erase_owned(" + hiString + ")";
-          }
+          var lo, _, recIdentsLo := GenExpr(lo, selfIdent, params, OwnershipOwned);
+          var hi, _, recIdentsHi := GenExpr(hi, selfIdent, params, OwnershipOwned);
 
-          s := "::dafny_runtime::integer_range(" + loString + ", " + hiString + ")";
-          isOwned := true;
-          isErased := true;
+          r := R.RawExpr("::dafny_runtime::integer_range(" + lo.ToString(IND) + ", " + hi.ToString(IND) + ")");
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
           readIdents := recIdentsLo + recIdentsHi;
+          return;
+        }
+        case MapBuilder(keyType, valueType) => {
+          var kType := GenType(keyType, false, false);
+          var vType := GenType(valueType, false, false);
+          r := R.RawExpr("::dafny_runtime::MapBuilder::<" + kType.ToString(IND) + ", " + vType.ToString(IND) + ">::new()");
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
+          readIdents := {};
+          return;
+        }
+        case SetBuilder(elemType) => {
+          var eType := GenType(elemType, false, false);
+          readIdents := {};
+          r := R.RawExpr("::dafny_runtime::SetBuilder::<" + eType.ToString(IND) + ">::new()");
+          r, resultingOwnership := FromOwned(r, expectedOwnership);
+          return;
         }
       }
     }
 
-    static method Compile(p: seq<Module>) returns (s: string) {
+    method Compile(p: seq<Module>) returns (s: string) {
       s := "#![allow(warnings, unconditional_panic)]\n";
       s := s + "#![allow(nonstandard_style)]\n";
       s := s + "extern crate dafny_runtime;\n";
diff --git a/Source/DafnyCore/Backends/Rust/RustBackend.cs b/Source/DafnyCore/Backends/Rust/RustBackend.cs
index 93ffc769c56..1e2a56897d3 100644
--- a/Source/DafnyCore/Backends/Rust/RustBackend.cs
+++ b/Source/DafnyCore/Backends/Rust/RustBackend.cs
@@ -10,6 +10,7 @@
 namespace Microsoft.Dafny.Compilers;
 
 public class RustBackend : DafnyExecutableBackend {
+  protected override bool PreventShadowing => false;
 
   public override IReadOnlySet<string> SupportedExtensions => new HashSet<string> { ".rs" };
   public override string TargetName => "Rust";
@@ -20,6 +21,9 @@ public class RustBackend : DafnyExecutableBackend {
   public override bool SupportsInMemoryCompilation => false;
   public override bool TextualTargetIsExecutable => false;
 
+  public override IReadOnlySet<string> SupportedNativeTypes =>
+    new HashSet<string> { "byte", "sbyte", "ushort", "short", "uint", "int", "ulong", "long", "udoublelong", "doublelong" };
+
   public override string TargetBasename(string dafnyProgramName) =>
     Regex.Replace(base.TargetBasename(dafnyProgramName), "[^_A-Za-z0-9]", "_");
 
diff --git a/Source/DafnyCore/Backends/Rust/RustCodeGenerator.cs b/Source/DafnyCore/Backends/Rust/RustCodeGenerator.cs
index b7062026958..dd0c16440cf 100644
--- a/Source/DafnyCore/Backends/Rust/RustCodeGenerator.cs
+++ b/Source/DafnyCore/Backends/Rust/RustCodeGenerator.cs
@@ -9,7 +9,9 @@ namespace Microsoft.Dafny.Compilers {
   class RustCodeGenerator : DafnyWrittenCodeGenerator {
 
     public override ISequence<Rune> Compile(Sequence<DAST.Module> program) {
-      return COMP.Compile(program);
+      var c = new COMP();
+      c.__ctor(true);
+      return c.Compile(program);
     }
 
     public override ISequence<Rune> EmitCallToMain(string fullName) {
diff --git a/Source/DafnyCore/Backends/SinglePassCodeGenerator.cs b/Source/DafnyCore/Backends/SinglePassCodeGenerator.cs
index 3cd40978592..4d008481cf6 100644
--- a/Source/DafnyCore/Backends/SinglePassCodeGenerator.cs
+++ b/Source/DafnyCore/Backends/SinglePassCodeGenerator.cs
@@ -971,9 +971,12 @@ protected virtual string IdName(TypeParameter tp) {
       Contract.Requires(tp != null);
       return IdProtect(tp.GetCompileName(Options));
     }
+    protected virtual string GetCompileNameNotProtected(IVariable v) {
+      return v.CompileName;
+    }
     protected virtual string IdName(IVariable v) {
       Contract.Requires(v != null);
-      return IdProtect(v.CompileName);
+      return IdProtect(GetCompileNameNotProtected(v));
     }
     protected virtual string IdMemberName(MemberSelectExpr mse) {
       Contract.Requires(mse != null);
@@ -1443,7 +1446,8 @@ protected abstract void EmitMapDisplay(MapType mt, IToken tok, List<ExpressionPa
     /// <summary>
     /// The "ct" type is either a SetType or a MapType.
     /// </summary>
-    protected abstract string GetCollectionBuilder_Build(CollectionType ct, IToken tok, string collName, ConcreteSyntaxTree wr);
+    protected abstract void GetCollectionBuilder_Build(CollectionType ct, IToken tok, string collName,
+      ConcreteSyntaxTree wr, ConcreteSyntaxTree wStmt);
 
     /// <summary>
     /// Returns a pair (ty, f) where
@@ -2807,7 +2811,7 @@ void TrCasePatternOpt<VT>(CasePattern<VT> pat, Expression rhs, Action<ConcreteSy
         var bv = pat.Var;
         if (!bv.IsGhost) {
           var wStmts = wr.Fork();
-          var w = DeclareLocalVar(IdProtect(bv.CompileName), bv.Type, rhsTok, wr);
+          var w = DeclareLocalVar(IdName(bv), bv.Type, rhsTok, wr);
           if (rhs != null) {
             w = EmitCoercionIfNecessary(from: rhs.Type, to: bv.Type, tok: rhsTok, wr: w);
             EmitExpr(rhs, inLetExprBody, w, wStmts);
@@ -3663,7 +3667,7 @@ protected void TrStmt(Statement stmt, ConcreteSyntaxTree wr, ConcreteSyntaxTree
           Error(ErrorId.c_bodyless_modify_statement_forbidden, s.Tok, "modify statement without a body forbidden by the --enforce-determinism option", wr);
         }
       } else if (stmt is TryRecoverStatement h) {
-        EmitHaltRecoveryStmt(h.TryBody, h.HaltMessageVar.CompileName, h.RecoverBody, wr);
+        EmitHaltRecoveryStmt(h.TryBody, IdName(h.HaltMessageVar), h.RecoverBody, wr);
       } else {
         Contract.Assert(false); throw new cce.UnreachableException();  // unexpected statement
       }
@@ -5587,8 +5591,8 @@ void EmitExpr(Expression e2, ConcreteSyntaxTree wr2, bool inLetExpr, ConcreteSyn
         var thn = EmitIf(out var guardWriter, false, wr);
         EmitExpr(e.Range, inLetExprBody, guardWriter, wStmts);
         EmitSetBuilder_Add(setType, collectionName, e.Term, inLetExprBody, thn);
-        var s = GetCollectionBuilder_Build(setType, e.tok, collectionName, wr);
-        EmitReturnExpr(s, bwr);
+        var returned = EmitReturnExpr(bwr);
+        GetCollectionBuilder_Build(setType, e.tok, collectionName, returned, wStmts);
 
       } else if (expr is MapComprehension) {
         var e = (MapComprehension)expr;
@@ -5641,8 +5645,8 @@ void EmitExpr(Expression e2, ConcreteSyntaxTree wr2, bool inLetExpr, ConcreteSyn
           EmitExpr(e.TermLeft, inLetExprBody, termLeftWriter, wStmts);
         }
 
-        var s = GetCollectionBuilder_Build(mapType, e.tok, collection_name, wr);
-        EmitReturnExpr(s, bwr);
+        var returned = EmitReturnExpr(bwr);
+        GetCollectionBuilder_Build(mapType, e.tok, collection_name, returned, wStmts);
 
       } else if (expr is LambdaExpr) {
         var e = (LambdaExpr)expr;
@@ -6096,7 +6100,7 @@ ConcreteSyntaxTree TrCasePattern(CasePattern<BoundVar> pat, Action<ConcreteSynta
       if (pat.Var != null) {
         var bv = pat.Var;
         if (!bv.IsGhost) {
-          CreateIIFE(IdProtect(bv.CompileName), bv.Type, bv.Tok, bodyType, pat.tok, wr, ref wStmts, out var wrRhs, out var wrBody);
+          CreateIIFE(IdName(bv), bv.Type, bv.Tok, bodyType, pat.tok, wr, ref wStmts, out var wrRhs, out var wrBody);
           wrRhs = EmitDowncastIfNecessary(rhsType, bv.Type, bv.tok, wrRhs);
           rhs(wrRhs);
           return wrBody;
diff --git a/Source/DafnyCore/DafnyGeneratedFromDafny.sh b/Source/DafnyCore/DafnyGeneratedFromDafny.sh
index d823e821579..0ddc0f29c2c 100755
--- a/Source/DafnyCore/DafnyGeneratedFromDafny.sh
+++ b/Source/DafnyCore/DafnyGeneratedFromDafny.sh
@@ -17,14 +17,6 @@ if [ "$#" != 0 ] && [ "$1" == "--no-verify" ]; then
 else
   noverify=""
 fi
-
-# If the argument --no-format is passed to the script, we pop it and won't format the resulting cs
-if [ "$#" != 0 ] && [ "$1" == "--no-format" ]; then
-  noformat="true"
-  shift
-else
-  noformat="false"
-fi
   
 # If an argument is passed to the script, store it in this variable. Otherwise use the default "GeneratedFromDafny.cs"
 # Something like output = if no arguments then  "GeneratedFromDafny.cs" else first argument
@@ -37,18 +29,4 @@ fi
 
 ../../Scripts/dafny translate cs dfyconfig.toml --output $output.cs $noverify
 
-# We will remove all the namespaces Std.* except Std.Wrappers
-python3 -c "
-import re
-with open ('$output.cs', 'r' ) as f:
-  content = f.read()
-  content_trimmed = re.sub('\\[assembly[\\s\\S]*?(?=namespace Formatting)|namespace\\s+\\w+\\s*\\{\\s*\\}\\s*//.*|_\\d_', '', content, flags = re.M)
-  content_new = re.sub('\\r?\\nnamespace\\s+(Std\\.(?!Wrappers)(?!Strings)(?!Collections.Seq)(?!Arithmetic)(?!Math)\\S+)\\s*\\{[\\s\\S]*?\\}\\s*// end of namespace \\\\1', '', content_trimmed, flags = re.M)
-
-with open('$output.cs', 'w') as w:
-  w.write(content_new)
-"
-
-if [ "$noformat" == "false" ]; then
-  dotnet format whitespace --include $output.cs 
-fi
\ No newline at end of file
+python3 DafnyGeneratedFromDafnyPost.py $output
\ No newline at end of file
diff --git a/Source/DafnyCore/DafnyGeneratedFromDafnyPost.py b/Source/DafnyCore/DafnyGeneratedFromDafnyPost.py
new file mode 100644
index 00000000000..88906120526
--- /dev/null
+++ b/Source/DafnyCore/DafnyGeneratedFromDafnyPost.py
@@ -0,0 +1,68 @@
+import re
+import os
+import sys
+# Define output as the first command-line argument
+output = sys.argv[1]
+
+# We will remove all the namespaces Std.* except Std.Wrappers
+# Also, we will replace every Dafny.HaltException("Backends\\Rust\\ by Dafny.HaltException("Backends/Rust/
+# to ensure the source is built the same on linux
+# It requires 16 backslashes for escaping because
+# - 2 as there are two backslashes
+# - 2 as it's a bash string
+# - 2 as it's a python string
+# - 2 as it's an escaped backslash
+# Last step is to split the generated file by namespace and put each in a separate directory inside Generated/
+# according to the namespace. It will make formatting easier.
+
+# test if the file exists before opening it. If not, fail gracefully
+if not os.path.exists(output + '.cs'):
+  print(f"File {output} was not generated. Fix issues and re-run ./DafnyGeneratedFromDafny.sh")
+  exit()
+
+with open (output + '.cs', 'r' ) as f:
+  content = f.read()
+  content_trimmed = re.sub('\[assembly[\s\S]*?(?=namespace Formatting)|namespace\s+\w+\s*\{\s*\}\s*//.*|_\d_', '', content, flags = re.M)
+  content_new = re.sub('\r?\nnamespace\s+(Std\.(?!Wrappers)(?!Strings)(?!Collections.Seq)(?!Arithmetic)(?!Math)\S+)\s*\{[\s\S]*?\}\s*// end of namespace \\1', '', content_trimmed, flags = re.M)
+  content_new = re.sub('Backends\\\\\\\\Rust\\\\\\\\', 'Backends/Rust/', content_new, flags = re.M)
+
+  # Any test looking like "  if()"
+
+  test_output = "../DafnyCore.Test/"
+
+  if not os.path.exists(output):
+    os.makedirs(output)
+  
+  if not os.path.exists(test_output+output):
+    os.makedirs(test_output+output)
+
+  prelude_match = re.match(r'(.*?)\nnamespace', content_new, re.DOTALL)
+  prelude = prelude_match.group(1).strip() if prelude_match else ""
+
+  # Define a regular expression to match the prelude and namespace blocks
+  pattern = re.compile(r'(namespace\s+([\w.]+)\s*{[\s\S]*?}\s*//\s*end\s*of\s*namespace\s+\2)')
+  # Find the prelude and namespace blocks
+  matches = pattern.findall(content_new)
+
+  # Iterate over matches and create files for each namespace
+  for match in matches:
+    namespace_content = match[0]  # Entire namespace block
+    namespace_name = match[1]
+    file_content = f"{prelude}\n\n{namespace_content}"
+
+    # If the name of the namespace ends with "coverage", we move this test
+    # to ../DafnyCore.Test/{output}/....
+    file_path_prefix = ""
+    if namespace_name.endswith("Coverage"):
+      file_path_prefix = test_output
+    
+    # Write content to a file
+    file_path = f"{file_path_prefix}{output}/{namespace_name.replace('.', '_')}.cs"  # Replace dots with underscores in file name
+    with open(file_path, 'w') as file:
+      file.write(file_content)
+
+    print(f"File generated: {file_path}")
+
+# Now delete the file output.cs
+os.remove(output + '.cs')
+print("File deleted: " + output + '.cs')
\ No newline at end of file
diff --git a/Source/DafnyCore/DafnyMain.cs b/Source/DafnyCore/DafnyMain.cs
index a8d6c82a369..d681c92e472 100644
--- a/Source/DafnyCore/DafnyMain.cs
+++ b/Source/DafnyCore/DafnyMain.cs
@@ -35,6 +35,9 @@ public static void MaybePrintProgram(Program program, string filename, bool afte
       var tw = filename == "-" ? program.Options.OutputWriter : new StreamWriter(filename);
       var pr = new Printer(tw, program.Options, program.Options.PrintMode);
       pr.PrintProgramLargeStack(program, afterResolver);
+      if (filename != "-") {
+        tw.Dispose();
+      }
     }
 
     /// <summary>
diff --git a/Source/DafnyCore/DafnyOptions.cs b/Source/DafnyCore/DafnyOptions.cs
index 843de9647b5..6ef92d58f0c 100644
--- a/Source/DafnyCore/DafnyOptions.cs
+++ b/Source/DafnyCore/DafnyOptions.cs
@@ -654,6 +654,10 @@ protected bool ParseDafnySpecificOption(string name, Bpl.CommandLineParseState p
           VerifyAllModules = true;
           return true;
 
+        case "emitUncompilableCode":
+          this.Set(CommonOptionBag.EmitUncompilableCode, true);
+          return true;
+
         case "separateModuleOutput":
           SeparateModuleOutput = true;
           return true;
@@ -1369,6 +1373,11 @@ Treat warnings as errors.
 /verifyAllModules
     Verify modules that come from an include directive.
 
+/emitUncompilableCode
+    Allow compilers to emit uncompilable code that usually contain useful
+    information about what feature is missing, rather than
+    stopping on the first problem
+
 /separateModuleOutput
     Output verification results for each module separately, rather than
     aggregating them after they are all finished.
diff --git a/Source/DafnyCore/Feature.cs b/Source/DafnyCore/Feature.cs
index 82958d87c81..cec43386f0c 100644
--- a/Source/DafnyCore/Feature.cs
+++ b/Source/DafnyCore/Feature.cs
@@ -208,3 +208,19 @@ public UnsupportedFeatureException(IToken token, Feature feature, string message
     Feature = feature;
   }
 }
+
+
+
+public class RecoverableUnsupportedFeatureException : UnsupportedFeatureException {
+
+  public static readonly string MessageSuffix = ". To continue despite this issue, you can compile with the option --" +
+                                       CommonOptionBag.EmitUncompilableCode.Name;
+  public RecoverableUnsupportedFeatureException(IToken token, Feature feature)
+    : base(token, feature, MessagePrefix + FeatureDescriptionAttribute.GetDescription(feature).Description + MessageSuffix) {
+  }
+}
+
+public class UnsupportedInvalidOperationException : InvalidOperationException {
+  public UnsupportedInvalidOperationException(string why) : base(why) {
+  }
+}
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny.cs b/Source/DafnyCore/GeneratedFromDafny.cs
deleted file mode 100644
index 6a42a24e660..00000000000
--- a/Source/DafnyCore/GeneratedFromDafny.cs
+++ /dev/null
@@ -1,21419 +0,0 @@
-// Dafny program the_program compiled into C#
-// To recompile, you will need the libraries
-//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
-// but the 'dotnet' tool in net6.0 should pick those up automatically.
-// Optionally, you may want to include compiler switches like
-//     /debug /nowarn:162,164,168,183,219,436,1717,1718
-
-using System;
-using System.Numerics;
-using System.Collections;
-namespace Formatting {
-
-  public partial class __default {
-    public static System.String ReindentProgramFromFirstToken(Microsoft.Dafny.IToken firstToken, Formatting.IIndentationFormatter reindent) {
-      System.String s = default(System.String);
-      Microsoft.Dafny.IToken token;
-      token = firstToken;
-      System.Text.StringBuilder sb;
-      System.Text.StringBuilder _nw0 = new System.Text.StringBuilder();
-      sb = _nw0;
-      while ((token) != (object)((Microsoft.Dafny.IToken)null)) {
-        System.String newLeadingTrivia;
-        newLeadingTrivia = (reindent).GetNewLeadingTrivia(token);
-        System.String newTrailingTrivia;
-        newTrailingTrivia = (reindent).GetNewTrailingTrivia(token);
-        (sb).Append(newLeadingTrivia);
-        (sb).Append(token.val);
-        (sb).Append(newTrailingTrivia);
-        token = token.Next;
-      }
-      System.String _out0;
-      _out0 = (sb).ToString().ToString();
-      s = _out0;
-      return s;
-    }
-  }
-
-  public interface IIndentationFormatter {
-    System.String GetNewLeadingTrivia(Microsoft.Dafny.IToken token);
-    System.String GetNewTrailingTrivia(Microsoft.Dafny.IToken token);
-  }
-  public class _Companion_IIndentationFormatter {
-  }
-} // end of namespace Formatting
-
-
-namespace Std.Wrappers {
-
-  public partial class __default {
-    public static Std.Wrappers._IOutcomeResult<__E> Need<__E>(bool condition, __E error) {
-      if (condition) {
-        return Std.Wrappers.OutcomeResult<__E>.create_Pass_k();
-      } else {
-        return Std.Wrappers.OutcomeResult<__E>.create_Fail_k(error);
-      }
-    }
-  }
-
-  public interface _IOption<out T> {
-    bool is_None { get; }
-    bool is_Some { get; }
-    T dtor_value { get; }
-    _IOption<__T> DowncastClone<__T>(Func<T, __T> converter0);
-    bool IsFailure();
-    Std.Wrappers._IOption<__U> PropagateFailure<__U>();
-    T Extract();
-    Std.Wrappers._IResult<T, __E> ToResult<__E>(__E error);
-    Std.Wrappers._IOutcome<__E> ToOutcome<__E>(__E error);
-  }
-  public abstract class Option<T> : _IOption<T> {
-    public Option() {
-    }
-    public static Std.Wrappers._IOption<T> Default() {
-      return create_None();
-    }
-    public static Dafny.TypeDescriptor<Std.Wrappers._IOption<T>> _TypeDescriptor() {
-      return new Dafny.TypeDescriptor<Std.Wrappers._IOption<T>>(Std.Wrappers.Option<T>.Default());
-    }
-    public static _IOption<T> create_None() {
-      return new Option_None<T>();
-    }
-    public static _IOption<T> create_Some(T @value) {
-      return new Option_Some<T>(@value);
-    }
-    public bool is_None { get { return this is Option_None<T>; } }
-    public bool is_Some { get { return this is Option_Some<T>; } }
-    public T dtor_value {
-      get {
-        var d = this;
-        return ((Option_Some<T>)d)._value;
-      }
-    }
-    public abstract _IOption<__T> DowncastClone<__T>(Func<T, __T> converter0);
-    public bool IsFailure() {
-      return (this).is_None;
-    }
-    public Std.Wrappers._IOption<__U> PropagateFailure<__U>() {
-      return Std.Wrappers.Option<__U>.create_None();
-    }
-    public T Extract() {
-      return (this).dtor_value;
-    }
-    public static T GetOr(Std.Wrappers._IOption<T> _this, T @default) {
-      Std.Wrappers._IOption<T> _source0 = _this;
-      if (_source0.is_None) {
-        return @default;
-      } else {
-        T __mcc_h0 = _source0.dtor_value;
-        T v = __mcc_h0;
-        return v;
-      }
-    }
-    public Std.Wrappers._IResult<T, __E> ToResult<__E>(__E error) {
-      Std.Wrappers._IOption<T> _source1 = this;
-      if (_source1.is_None) {
-        return Std.Wrappers.Result<T, __E>.create_Failure(error);
-      } else {
-        T __mcc_h0 = _source1.dtor_value;
-        T v = __mcc_h0;
-        return Std.Wrappers.Result<T, __E>.create_Success(v);
-      }
-    }
-    public Std.Wrappers._IOutcome<__E> ToOutcome<__E>(__E error) {
-      Std.Wrappers._IOption<T> _source2 = this;
-      if (_source2.is_None) {
-        return Std.Wrappers.Outcome<__E>.create_Fail(error);
-      } else {
-        T __mcc_h0 = _source2.dtor_value;
-        T v = __mcc_h0;
-        return Std.Wrappers.Outcome<__E>.create_Pass();
-      }
-    }
-    public static __FC Map<__FC>(Std.Wrappers._IOption<T> _this, Func<Std.Wrappers._IOption<T>, __FC> rewrap) {
-      return Dafny.Helpers.Id<Func<Std.Wrappers._IOption<T>, __FC>>(rewrap)(_this);
-    }
-  }
-  public class Option_None<T> : Option<T> {
-    public Option_None() : base() {
-    }
-    public override _IOption<__T> DowncastClone<__T>(Func<T, __T> converter0) {
-      if (this is _IOption<__T> dt) { return dt; }
-      return new Option_None<__T>();
-    }
-    public override bool Equals(object other) {
-      var oth = other as Std.Wrappers.Option_None<T>;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "Wrappers.Option.None";
-      return s;
-    }
-  }
-  public class Option_Some<T> : Option<T> {
-    public readonly T _value;
-    public Option_Some(T @value) : base() {
-      this._value = @value;
-    }
-    public override _IOption<__T> DowncastClone<__T>(Func<T, __T> converter0) {
-      if (this is _IOption<__T> dt) { return dt; }
-      return new Option_Some<__T>(converter0(_value));
-    }
-    public override bool Equals(object other) {
-      var oth = other as Std.Wrappers.Option_Some<T>;
-      return oth != null && object.Equals(this._value, oth._value);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 1;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._value));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "Wrappers.Option.Some";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._value);
-      s += ")";
-      return s;
-    }
-  }
-
-  public interface _IResult<out R, out E> {
-    bool is_Success { get; }
-    bool is_Failure { get; }
-    R dtor_value { get; }
-    E dtor_error { get; }
-    _IResult<__R, __E> DowncastClone<__R, __E>(Func<R, __R> converter0, Func<E, __E> converter1);
-    bool IsFailure();
-    Std.Wrappers._IResult<__U, E> PropagateFailure<__U>();
-    R Extract();
-    Std.Wrappers._IOption<R> ToOption();
-    Std.Wrappers._IOutcome<E> ToOutcome();
-  }
-  public abstract class Result<R, E> : _IResult<R, E> {
-    public Result() {
-    }
-    public static Std.Wrappers._IResult<R, E> Default(R _default_R) {
-      return create_Success(_default_R);
-    }
-    public static Dafny.TypeDescriptor<Std.Wrappers._IResult<R, E>> _TypeDescriptor(Dafny.TypeDescriptor<R> _td_R) {
-      return new Dafny.TypeDescriptor<Std.Wrappers._IResult<R, E>>(Std.Wrappers.Result<R, E>.Default(_td_R.Default()));
-    }
-    public static _IResult<R, E> create_Success(R @value) {
-      return new Result_Success<R, E>(@value);
-    }
-    public static _IResult<R, E> create_Failure(E error) {
-      return new Result_Failure<R, E>(error);
-    }
-    public bool is_Success { get { return this is Result_Success<R, E>; } }
-    public bool is_Failure { get { return this is Result_Failure<R, E>; } }
-    public R dtor_value {
-      get {
-        var d = this;
-        return ((Result_Success<R, E>)d)._value;
-      }
-    }
-    public E dtor_error {
-      get {
-        var d = this;
-        return ((Result_Failure<R, E>)d)._error;
-      }
-    }
-    public abstract _IResult<__R, __E> DowncastClone<__R, __E>(Func<R, __R> converter0, Func<E, __E> converter1);
-    public bool IsFailure() {
-      return (this).is_Failure;
-    }
-    public Std.Wrappers._IResult<__U, E> PropagateFailure<__U>() {
-      return Std.Wrappers.Result<__U, E>.create_Failure((this).dtor_error);
-    }
-    public R Extract() {
-      return (this).dtor_value;
-    }
-    public static R GetOr(Std.Wrappers._IResult<R, E> _this, R @default) {
-      Std.Wrappers._IResult<R, E> _source3 = _this;
-      if (_source3.is_Success) {
-        R _10___mcc_h0 = _source3.dtor_value;
-        R _11_s = _10___mcc_h0;
-        return _11_s;
-      } else {
-        E _12___mcc_h1 = _source3.dtor_error;
-        E _13_e = _12___mcc_h1;
-        return @default;
-      }
-    }
-    public Std.Wrappers._IOption<R> ToOption() {
-      Std.Wrappers._IResult<R, E> _source4 = this;
-      if (_source4.is_Success) {
-        R _14___mcc_h0 = _source4.dtor_value;
-        R _15_s = _14___mcc_h0;
-        return Std.Wrappers.Option<R>.create_Some(_15_s);
-      } else {
-        E _16___mcc_h1 = _source4.dtor_error;
-        E _17_e = _16___mcc_h1;
-        return Std.Wrappers.Option<R>.create_None();
-      }
-    }
-    public Std.Wrappers._IOutcome<E> ToOutcome() {
-      Std.Wrappers._IResult<R, E> _source5 = this;
-      if (_source5.is_Success) {
-        R _18___mcc_h0 = _source5.dtor_value;
-        R _19_s = _18___mcc_h0;
-        return Std.Wrappers.Outcome<E>.create_Pass();
-      } else {
-        E _20___mcc_h1 = _source5.dtor_error;
-        E _21_e = _20___mcc_h1;
-        return Std.Wrappers.Outcome<E>.create_Fail(_21_e);
-      }
-    }
-    public static __FC Map<__FC>(Std.Wrappers._IResult<R, E> _this, Func<Std.Wrappers._IResult<R, E>, __FC> rewrap) {
-      return Dafny.Helpers.Id<Func<Std.Wrappers._IResult<R, E>, __FC>>(rewrap)(_this);
-    }
-    public static Std.Wrappers._IResult<R, __NewE> MapFailure<__NewE>(Std.Wrappers._IResult<R, E> _this, Func<E, __NewE> reWrap) {
-      Std.Wrappers._IResult<R, E> _source6 = _this;
-      if (_source6.is_Success) {
-        R _22___mcc_h0 = _source6.dtor_value;
-        R _23_s = _22___mcc_h0;
-        return Std.Wrappers.Result<R, __NewE>.create_Success(_23_s);
-      } else {
-        E _24___mcc_h1 = _source6.dtor_error;
-        E _25_e = _24___mcc_h1;
-        return Std.Wrappers.Result<R, __NewE>.create_Failure(Dafny.Helpers.Id<Func<E, __NewE>>(reWrap)(_25_e));
-      }
-    }
-  }
-  public class Result_Success<R, E> : Result<R, E> {
-    public readonly R _value;
-    public Result_Success(R @value) : base() {
-      this._value = @value;
-    }
-    public override _IResult<__R, __E> DowncastClone<__R, __E>(Func<R, __R> converter0, Func<E, __E> converter1) {
-      if (this is _IResult<__R, __E> dt) { return dt; }
-      return new Result_Success<__R, __E>(converter0(_value));
-    }
-    public override bool Equals(object other) {
-      var oth = other as Std.Wrappers.Result_Success<R, E>;
-      return oth != null && object.Equals(this._value, oth._value);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._value));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "Wrappers.Result.Success";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._value);
-      s += ")";
-      return s;
-    }
-  }
-  public class Result_Failure<R, E> : Result<R, E> {
-    public readonly E _error;
-    public Result_Failure(E error) : base() {
-      this._error = error;
-    }
-    public override _IResult<__R, __E> DowncastClone<__R, __E>(Func<R, __R> converter0, Func<E, __E> converter1) {
-      if (this is _IResult<__R, __E> dt) { return dt; }
-      return new Result_Failure<__R, __E>(converter1(_error));
-    }
-    public override bool Equals(object other) {
-      var oth = other as Std.Wrappers.Result_Failure<R, E>;
-      return oth != null && object.Equals(this._error, oth._error);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 1;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._error));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "Wrappers.Result.Failure";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._error);
-      s += ")";
-      return s;
-    }
-  }
-
-  public interface _IOutcome<out E> {
-    bool is_Pass { get; }
-    bool is_Fail { get; }
-    E dtor_error { get; }
-    _IOutcome<__E> DowncastClone<__E>(Func<E, __E> converter0);
-    bool IsFailure();
-    Std.Wrappers._IOutcome<E> PropagateFailure();
-    Std.Wrappers._IOption<__R> ToOption<__R>(__R r);
-    Std.Wrappers._IResult<__R, E> ToResult<__R>(__R r);
-  }
-  public abstract class Outcome<E> : _IOutcome<E> {
-    public Outcome() {
-    }
-    public static Std.Wrappers._IOutcome<E> Default() {
-      return create_Pass();
-    }
-    public static Dafny.TypeDescriptor<Std.Wrappers._IOutcome<E>> _TypeDescriptor() {
-      return new Dafny.TypeDescriptor<Std.Wrappers._IOutcome<E>>(Std.Wrappers.Outcome<E>.Default());
-    }
-    public static _IOutcome<E> create_Pass() {
-      return new Outcome_Pass<E>();
-    }
-    public static _IOutcome<E> create_Fail(E error) {
-      return new Outcome_Fail<E>(error);
-    }
-    public bool is_Pass { get { return this is Outcome_Pass<E>; } }
-    public bool is_Fail { get { return this is Outcome_Fail<E>; } }
-    public E dtor_error {
-      get {
-        var d = this;
-        return ((Outcome_Fail<E>)d)._error;
-      }
-    }
-    public abstract _IOutcome<__E> DowncastClone<__E>(Func<E, __E> converter0);
-    public bool IsFailure() {
-      return (this).is_Fail;
-    }
-    public Std.Wrappers._IOutcome<E> PropagateFailure() {
-      return this;
-    }
-    public Std.Wrappers._IOption<__R> ToOption<__R>(__R r) {
-      Std.Wrappers._IOutcome<E> _source7 = this;
-      if (_source7.is_Pass) {
-        return Std.Wrappers.Option<__R>.create_Some(r);
-      } else {
-        E _26___mcc_h0 = _source7.dtor_error;
-        E _27_e = _26___mcc_h0;
-        return Std.Wrappers.Option<__R>.create_None();
-      }
-    }
-    public Std.Wrappers._IResult<__R, E> ToResult<__R>(__R r) {
-      Std.Wrappers._IOutcome<E> _source8 = this;
-      if (_source8.is_Pass) {
-        return Std.Wrappers.Result<__R, E>.create_Success(r);
-      } else {
-        E _28___mcc_h0 = _source8.dtor_error;
-        E _29_e = _28___mcc_h0;
-        return Std.Wrappers.Result<__R, E>.create_Failure(_29_e);
-      }
-    }
-    public static __FC Map<__FC>(Std.Wrappers._IOutcome<E> _this, Func<Std.Wrappers._IOutcome<E>, __FC> rewrap) {
-      return Dafny.Helpers.Id<Func<Std.Wrappers._IOutcome<E>, __FC>>(rewrap)(_this);
-    }
-    public static Std.Wrappers._IResult<__T, __NewE> MapFailure<__T, __NewE>(Std.Wrappers._IOutcome<E> _this, Func<E, __NewE> rewrap, __T @default) {
-      Std.Wrappers._IOutcome<E> _source9 = _this;
-      if (_source9.is_Pass) {
-        return Std.Wrappers.Result<__T, __NewE>.create_Success(@default);
-      } else {
-        E _30___mcc_h0 = _source9.dtor_error;
-        E _31_e = _30___mcc_h0;
-        return Std.Wrappers.Result<__T, __NewE>.create_Failure(Dafny.Helpers.Id<Func<E, __NewE>>(rewrap)(_31_e));
-      }
-    }
-    public static Std.Wrappers._IOutcome<E> Need(bool condition, E error) {
-      if (condition) {
-        return Std.Wrappers.Outcome<E>.create_Pass();
-      } else {
-        return Std.Wrappers.Outcome<E>.create_Fail(error);
-      }
-    }
-  }
-  public class Outcome_Pass<E> : Outcome<E> {
-    public Outcome_Pass() : base() {
-    }
-    public override _IOutcome<__E> DowncastClone<__E>(Func<E, __E> converter0) {
-      if (this is _IOutcome<__E> dt) { return dt; }
-      return new Outcome_Pass<__E>();
-    }
-    public override bool Equals(object other) {
-      var oth = other as Std.Wrappers.Outcome_Pass<E>;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "Wrappers.Outcome.Pass";
-      return s;
-    }
-  }
-  public class Outcome_Fail<E> : Outcome<E> {
-    public readonly E _error;
-    public Outcome_Fail(E error) : base() {
-      this._error = error;
-    }
-    public override _IOutcome<__E> DowncastClone<__E>(Func<E, __E> converter0) {
-      if (this is _IOutcome<__E> dt) { return dt; }
-      return new Outcome_Fail<__E>(converter0(_error));
-    }
-    public override bool Equals(object other) {
-      var oth = other as Std.Wrappers.Outcome_Fail<E>;
-      return oth != null && object.Equals(this._error, oth._error);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 1;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._error));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "Wrappers.Outcome.Fail";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._error);
-      s += ")";
-      return s;
-    }
-  }
-
-  public interface _IOutcomeResult<out E> {
-    bool is_Pass_k { get; }
-    bool is_Fail_k { get; }
-    E dtor_error { get; }
-    _IOutcomeResult<__E> DowncastClone<__E>(Func<E, __E> converter0);
-    bool IsFailure();
-    Std.Wrappers._IResult<__U, E> PropagateFailure<__U>();
-  }
-  public abstract class OutcomeResult<E> : _IOutcomeResult<E> {
-    public OutcomeResult() {
-    }
-    public static Std.Wrappers._IOutcomeResult<E> Default() {
-      return create_Pass_k();
-    }
-    public static Dafny.TypeDescriptor<Std.Wrappers._IOutcomeResult<E>> _TypeDescriptor() {
-      return new Dafny.TypeDescriptor<Std.Wrappers._IOutcomeResult<E>>(Std.Wrappers.OutcomeResult<E>.Default());
-    }
-    public static _IOutcomeResult<E> create_Pass_k() {
-      return new OutcomeResult_Pass_k<E>();
-    }
-    public static _IOutcomeResult<E> create_Fail_k(E error) {
-      return new OutcomeResult_Fail_k<E>(error);
-    }
-    public bool is_Pass_k { get { return this is OutcomeResult_Pass_k<E>; } }
-    public bool is_Fail_k { get { return this is OutcomeResult_Fail_k<E>; } }
-    public E dtor_error {
-      get {
-        var d = this;
-        return ((OutcomeResult_Fail_k<E>)d)._error;
-      }
-    }
-    public abstract _IOutcomeResult<__E> DowncastClone<__E>(Func<E, __E> converter0);
-    public bool IsFailure() {
-      return (this).is_Fail_k;
-    }
-    public Std.Wrappers._IResult<__U, E> PropagateFailure<__U>() {
-      return Std.Wrappers.Result<__U, E>.create_Failure((this).dtor_error);
-    }
-  }
-  public class OutcomeResult_Pass_k<E> : OutcomeResult<E> {
-    public OutcomeResult_Pass_k() : base() {
-    }
-    public override _IOutcomeResult<__E> DowncastClone<__E>(Func<E, __E> converter0) {
-      if (this is _IOutcomeResult<__E> dt) { return dt; }
-      return new OutcomeResult_Pass_k<__E>();
-    }
-    public override bool Equals(object other) {
-      var oth = other as Std.Wrappers.OutcomeResult_Pass_k<E>;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "Wrappers.OutcomeResult.Pass'";
-      return s;
-    }
-  }
-  public class OutcomeResult_Fail_k<E> : OutcomeResult<E> {
-    public readonly E _error;
-    public OutcomeResult_Fail_k(E error) : base() {
-      this._error = error;
-    }
-    public override _IOutcomeResult<__E> DowncastClone<__E>(Func<E, __E> converter0) {
-      if (this is _IOutcomeResult<__E> dt) { return dt; }
-      return new OutcomeResult_Fail_k<__E>(converter0(_error));
-    }
-    public override bool Equals(object other) {
-      var oth = other as Std.Wrappers.OutcomeResult_Fail_k<E>;
-      return oth != null && object.Equals(this._error, oth._error);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 1;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._error));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "Wrappers.OutcomeResult.Fail'";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._error);
-      s += ")";
-      return s;
-    }
-  }
-} // end of namespace Std.Wrappers
-namespace Std.Math {
-
-  public partial class __default {
-    public static BigInteger Min(BigInteger a, BigInteger b) {
-      if ((a) < (b)) {
-        return a;
-      } else {
-        return b;
-      }
-    }
-    public static BigInteger Min3(BigInteger a, BigInteger b, BigInteger c) {
-      return Std.Math.__default.Min(a, Std.Math.__default.Min(b, c));
-    }
-    public static BigInteger Max(BigInteger a, BigInteger b) {
-      if ((a) < (b)) {
-        return b;
-      } else {
-        return a;
-      }
-    }
-    public static BigInteger Max3(BigInteger a, BigInteger b, BigInteger c) {
-      return Std.Math.__default.Max(a, Std.Math.__default.Max(b, c));
-    }
-    public static BigInteger Abs(BigInteger a) {
-      if ((a).Sign == -1) {
-        return (BigInteger.Zero) - (a);
-      } else {
-        return a;
-      }
-    }
-  }
-} // end of namespace Std.Math
-namespace Std.Collections.Seq {
-
-  public partial class __default {
-    public static __T First<__T>(Dafny.ISequence<__T> xs) {
-      return (xs).Select(BigInteger.Zero);
-    }
-    public static Dafny.ISequence<__T> DropFirst<__T>(Dafny.ISequence<__T> xs) {
-      return (xs).Drop(BigInteger.One);
-    }
-    public static __T Last<__T>(Dafny.ISequence<__T> xs) {
-      return (xs).Select((new BigInteger((xs).Count)) - (BigInteger.One));
-    }
-    public static Dafny.ISequence<__T> DropLast<__T>(Dafny.ISequence<__T> xs) {
-      return (xs).Take((new BigInteger((xs).Count)) - (BigInteger.One));
-    }
-    public static __T[] ToArray<__T>(Dafny.ISequence<__T> xs) {
-      __T[] a = new __T[0];
-      Func<BigInteger, __T> _init2 = Dafny.Helpers.Id<Func<Dafny.ISequence<__T>, Func<BigInteger, __T>>>((_83_xs) => ((System.Func<BigInteger, __T>)((_84_i) => {
-        return (_83_xs).Select(_84_i);
-      })))(xs);
-      __T[] _nw3 = new __T[Dafny.Helpers.ToIntChecked(new BigInteger((xs).Count), "array size exceeds memory limit")];
-      for (var _i0_2 = 0; _i0_2 < new BigInteger(_nw3.Length); _i0_2++) {
-        _nw3[(int)(_i0_2)] = _init2(_i0_2);
-      }
-      a = _nw3;
-      return a;
-    }
-    public static Dafny.ISet<__T> ToSet<__T>(Dafny.ISequence<__T> xs) {
-      return Dafny.Helpers.Id<Func<Dafny.ISequence<__T>, Dafny.ISet<__T>>>((_85_xs) => ((System.Func<Dafny.ISet<__T>>)(() => {
-        var _coll0 = new System.Collections.Generic.List<__T>();
-        foreach (__T _compr_0 in (_85_xs).CloneAsArray()) {
-          __T _86_x = (__T)_compr_0;
-          if ((_85_xs).Contains(_86_x)) {
-            _coll0.Add(_86_x);
-          }
-        }
-        return Dafny.Set<__T>.FromCollection(_coll0);
-      }))())(xs);
-    }
-    public static BigInteger IndexOf<__T>(Dafny.ISequence<__T> xs, __T v) {
-      BigInteger _87___accumulator = BigInteger.Zero;
-    TAIL_CALL_START:;
-      if (object.Equals((xs).Select(BigInteger.Zero), v)) {
-        return (BigInteger.Zero) + (_87___accumulator);
-      } else {
-        _87___accumulator = (_87___accumulator) + (BigInteger.One);
-        Dafny.ISequence<__T> _in0 = (xs).Drop(BigInteger.One);
-        __T _in1 = v;
-        xs = _in0;
-        v = _in1;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static Std.Wrappers._IOption<BigInteger> IndexOfOption<__T>(Dafny.ISequence<__T> xs, __T v) {
-      return Std.Collections.Seq.__default.IndexByOption<__T>(xs, Dafny.Helpers.Id<Func<__T, Func<__T, bool>>>((_88_v) => ((System.Func<__T, bool>)((_89_x) => {
-        return object.Equals(_89_x, _88_v);
-      })))(v));
-    }
-    public static Std.Wrappers._IOption<BigInteger> IndexByOption<__T>(Dafny.ISequence<__T> xs, Func<__T, bool> p) {
-      if ((new BigInteger((xs).Count)).Sign == 0) {
-        return Std.Wrappers.Option<BigInteger>.create_None();
-      } else if (Dafny.Helpers.Id<Func<__T, bool>>(p)((xs).Select(BigInteger.Zero))) {
-        return Std.Wrappers.Option<BigInteger>.create_Some(BigInteger.Zero);
-      } else {
-        Std.Wrappers._IOption<BigInteger> _90_o_k = Std.Collections.Seq.__default.IndexByOption<__T>((xs).Drop(BigInteger.One), p);
-        if ((_90_o_k).is_Some) {
-          return Std.Wrappers.Option<BigInteger>.create_Some(((_90_o_k).dtor_value) + (BigInteger.One));
-        } else {
-          return Std.Wrappers.Option<BigInteger>.create_None();
-        }
-      }
-    }
-    public static BigInteger LastIndexOf<__T>(Dafny.ISequence<__T> xs, __T v) {
-    TAIL_CALL_START:;
-      if (object.Equals((xs).Select((new BigInteger((xs).Count)) - (BigInteger.One)), v)) {
-        return (new BigInteger((xs).Count)) - (BigInteger.One);
-      } else {
-        Dafny.ISequence<__T> _in2 = (xs).Take((new BigInteger((xs).Count)) - (BigInteger.One));
-        __T _in3 = v;
-        xs = _in2;
-        v = _in3;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static Std.Wrappers._IOption<BigInteger> LastIndexOfOption<__T>(Dafny.ISequence<__T> xs, __T v) {
-      return Std.Collections.Seq.__default.LastIndexByOption<__T>(xs, Dafny.Helpers.Id<Func<__T, Func<__T, bool>>>((_91_v) => ((System.Func<__T, bool>)((_92_x) => {
-        return object.Equals(_92_x, _91_v);
-      })))(v));
-    }
-    public static Std.Wrappers._IOption<BigInteger> LastIndexByOption<__T>(Dafny.ISequence<__T> xs, Func<__T, bool> p) {
-    TAIL_CALL_START:;
-      if ((new BigInteger((xs).Count)).Sign == 0) {
-        return Std.Wrappers.Option<BigInteger>.create_None();
-      } else if (Dafny.Helpers.Id<Func<__T, bool>>(p)((xs).Select((new BigInteger((xs).Count)) - (BigInteger.One)))) {
-        return Std.Wrappers.Option<BigInteger>.create_Some((new BigInteger((xs).Count)) - (BigInteger.One));
-      } else {
-        Dafny.ISequence<__T> _in4 = (xs).Take((new BigInteger((xs).Count)) - (BigInteger.One));
-        Func<__T, bool> _in5 = p;
-        xs = _in4;
-        p = _in5;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static Dafny.ISequence<__T> Remove<__T>(Dafny.ISequence<__T> xs, BigInteger pos) {
-      return Dafny.Sequence<__T>.Concat((xs).Take(pos), (xs).Drop((pos) + (BigInteger.One)));
-    }
-    public static Dafny.ISequence<__T> RemoveValue<__T>(Dafny.ISequence<__T> xs, __T v) {
-      if (!(xs).Contains(v)) {
-        return xs;
-      } else {
-        BigInteger _93_i = Std.Collections.Seq.__default.IndexOf<__T>(xs, v);
-        return Dafny.Sequence<__T>.Concat((xs).Take(_93_i), (xs).Drop((_93_i) + (BigInteger.One)));
-      }
-    }
-    public static Dafny.ISequence<__T> Insert<__T>(Dafny.ISequence<__T> xs, __T a, BigInteger pos) {
-      return Dafny.Sequence<__T>.Concat(Dafny.Sequence<__T>.Concat((xs).Take(pos), Dafny.Sequence<__T>.FromElements(a)), (xs).Drop(pos));
-    }
-    public static Dafny.ISequence<__T> Reverse<__T>(Dafny.ISequence<__T> xs) {
-      Dafny.ISequence<__T> _94___accumulator = Dafny.Sequence<__T>.FromElements();
-    TAIL_CALL_START:;
-      if ((xs).Equals(Dafny.Sequence<__T>.FromElements())) {
-        return Dafny.Sequence<__T>.Concat(_94___accumulator, Dafny.Sequence<__T>.FromElements());
-      } else {
-        _94___accumulator = Dafny.Sequence<__T>.Concat(_94___accumulator, Dafny.Sequence<__T>.FromElements((xs).Select((new BigInteger((xs).Count)) - (BigInteger.One))));
-        Dafny.ISequence<__T> _in6 = (xs).Subsequence(BigInteger.Zero, (new BigInteger((xs).Count)) - (BigInteger.One));
-        xs = _in6;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static Dafny.ISequence<__T> Repeat<__T>(__T v, BigInteger length) {
-      Dafny.ISequence<__T> _95___accumulator = Dafny.Sequence<__T>.FromElements();
-    TAIL_CALL_START:;
-      if ((length).Sign == 0) {
-        return Dafny.Sequence<__T>.Concat(_95___accumulator, Dafny.Sequence<__T>.FromElements());
-      } else {
-        _95___accumulator = Dafny.Sequence<__T>.Concat(_95___accumulator, Dafny.Sequence<__T>.FromElements(v));
-        __T _in7 = v;
-        BigInteger _in8 = (length) - (BigInteger.One);
-        v = _in7;
-        length = _in8;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static _System._ITuple2<Dafny.ISequence<__A>, Dafny.ISequence<__B>> Unzip<__A, __B>(Dafny.ISequence<_System._ITuple2<__A, __B>> xs) {
-      if ((new BigInteger((xs).Count)).Sign == 0) {
-        return _System.Tuple2<Dafny.ISequence<__A>, Dafny.ISequence<__B>>.create(Dafny.Sequence<__A>.FromElements(), Dafny.Sequence<__B>.FromElements());
-      } else {
-        _System._ITuple2<Dafny.ISequence<__A>, Dafny.ISequence<__B>> _let_tmp_rhs0 = Std.Collections.Seq.__default.Unzip<__A, __B>(Std.Collections.Seq.__default.DropLast<_System._ITuple2<__A, __B>>(xs));
-        Dafny.ISequence<__A> _96_a = _let_tmp_rhs0.dtor__0;
-        Dafny.ISequence<__B> _97_b = _let_tmp_rhs0.dtor__1;
-        return _System.Tuple2<Dafny.ISequence<__A>, Dafny.ISequence<__B>>.create(Dafny.Sequence<__A>.Concat(_96_a, Dafny.Sequence<__A>.FromElements((Std.Collections.Seq.__default.Last<_System._ITuple2<__A, __B>>(xs)).dtor__0)), Dafny.Sequence<__B>.Concat(_97_b, Dafny.Sequence<__B>.FromElements((Std.Collections.Seq.__default.Last<_System._ITuple2<__A, __B>>(xs)).dtor__1)));
-      }
-    }
-    public static Dafny.ISequence<_System._ITuple2<__A, __B>> Zip<__A, __B>(Dafny.ISequence<__A> xs, Dafny.ISequence<__B> ys) {
-      Dafny.ISequence<_System._ITuple2<__A, __B>> _98___accumulator = Dafny.Sequence<_System._ITuple2<__A, __B>>.FromElements();
-    TAIL_CALL_START:;
-      if ((new BigInteger((xs).Count)).Sign == 0) {
-        return Dafny.Sequence<_System._ITuple2<__A, __B>>.Concat(Dafny.Sequence<_System._ITuple2<__A, __B>>.FromElements(), _98___accumulator);
-      } else {
-        _98___accumulator = Dafny.Sequence<_System._ITuple2<__A, __B>>.Concat(Dafny.Sequence<_System._ITuple2<__A, __B>>.FromElements(_System.Tuple2<__A, __B>.create(Std.Collections.Seq.__default.Last<__A>(xs), Std.Collections.Seq.__default.Last<__B>(ys))), _98___accumulator);
-        Dafny.ISequence<__A> _in9 = Std.Collections.Seq.__default.DropLast<__A>(xs);
-        Dafny.ISequence<__B> _in10 = Std.Collections.Seq.__default.DropLast<__B>(ys);
-        xs = _in9;
-        ys = _in10;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static BigInteger Max(Dafny.ISequence<BigInteger> xs) {
-      if ((new BigInteger((xs).Count)) == (BigInteger.One)) {
-        return (xs).Select(BigInteger.Zero);
-      } else {
-        return Std.Math.__default.Max((xs).Select(BigInteger.Zero), Std.Collections.Seq.__default.Max((xs).Drop(BigInteger.One)));
-      }
-    }
-    public static BigInteger Min(Dafny.ISequence<BigInteger> xs) {
-      if ((new BigInteger((xs).Count)) == (BigInteger.One)) {
-        return (xs).Select(BigInteger.Zero);
-      } else {
-        return Std.Math.__default.Min((xs).Select(BigInteger.Zero), Std.Collections.Seq.__default.Min((xs).Drop(BigInteger.One)));
-      }
-    }
-    public static Dafny.ISequence<__T> Flatten<__T>(Dafny.ISequence<Dafny.ISequence<__T>> xs) {
-      Dafny.ISequence<__T> _99___accumulator = Dafny.Sequence<__T>.FromElements();
-    TAIL_CALL_START:;
-      if ((new BigInteger((xs).Count)).Sign == 0) {
-        return Dafny.Sequence<__T>.Concat(_99___accumulator, Dafny.Sequence<__T>.FromElements());
-      } else {
-        _99___accumulator = Dafny.Sequence<__T>.Concat(_99___accumulator, (xs).Select(BigInteger.Zero));
-        Dafny.ISequence<Dafny.ISequence<__T>> _in11 = (xs).Drop(BigInteger.One);
-        xs = _in11;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static Dafny.ISequence<__T> FlattenReverse<__T>(Dafny.ISequence<Dafny.ISequence<__T>> xs) {
-      Dafny.ISequence<__T> _100___accumulator = Dafny.Sequence<__T>.FromElements();
-    TAIL_CALL_START:;
-      if ((new BigInteger((xs).Count)).Sign == 0) {
-        return Dafny.Sequence<__T>.Concat(Dafny.Sequence<__T>.FromElements(), _100___accumulator);
-      } else {
-        _100___accumulator = Dafny.Sequence<__T>.Concat(Std.Collections.Seq.__default.Last<Dafny.ISequence<__T>>(xs), _100___accumulator);
-        Dafny.ISequence<Dafny.ISequence<__T>> _in12 = Std.Collections.Seq.__default.DropLast<Dafny.ISequence<__T>>(xs);
-        xs = _in12;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static Dafny.ISequence<__T> Join<__T>(Dafny.ISequence<Dafny.ISequence<__T>> seqs, Dafny.ISequence<__T> separator) {
-      Dafny.ISequence<__T> _101___accumulator = Dafny.Sequence<__T>.FromElements();
-    TAIL_CALL_START:;
-      if ((new BigInteger((seqs).Count)).Sign == 0) {
-        return Dafny.Sequence<__T>.Concat(_101___accumulator, Dafny.Sequence<__T>.FromElements());
-      } else if ((new BigInteger((seqs).Count)) == (BigInteger.One)) {
-        return Dafny.Sequence<__T>.Concat(_101___accumulator, (seqs).Select(BigInteger.Zero));
-      } else {
-        _101___accumulator = Dafny.Sequence<__T>.Concat(_101___accumulator, Dafny.Sequence<__T>.Concat((seqs).Select(BigInteger.Zero), separator));
-        Dafny.ISequence<Dafny.ISequence<__T>> _in13 = (seqs).Drop(BigInteger.One);
-        Dafny.ISequence<__T> _in14 = separator;
-        seqs = _in13;
-        separator = _in14;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static Dafny.ISequence<Dafny.ISequence<__T>> Split<__T>(Dafny.ISequence<__T> s, __T delim) {
-      Dafny.ISequence<Dafny.ISequence<__T>> _102___accumulator = Dafny.Sequence<Dafny.ISequence<__T>>.FromElements();
-    TAIL_CALL_START:;
-      Std.Wrappers._IOption<BigInteger> _103_i = Std.Collections.Seq.__default.IndexOfOption<__T>(s, delim);
-      if ((_103_i).is_Some) {
-        _102___accumulator = Dafny.Sequence<Dafny.ISequence<__T>>.Concat(_102___accumulator, Dafny.Sequence<Dafny.ISequence<__T>>.FromElements((s).Take((_103_i).dtor_value)));
-        Dafny.ISequence<__T> _in15 = (s).Drop(((_103_i).dtor_value) + (BigInteger.One));
-        __T _in16 = delim;
-        s = _in15;
-        delim = _in16;
-        goto TAIL_CALL_START;
-      } else {
-        return Dafny.Sequence<Dafny.ISequence<__T>>.Concat(_102___accumulator, Dafny.Sequence<Dafny.ISequence<__T>>.FromElements(s));
-      }
-    }
-    public static _System._ITuple2<Dafny.ISequence<__T>, Dafny.ISequence<__T>> SplitOnce<__T>(Dafny.ISequence<__T> s, __T delim) {
-      Std.Wrappers._IOption<BigInteger> _104_i = Std.Collections.Seq.__default.IndexOfOption<__T>(s, delim);
-      return _System.Tuple2<Dafny.ISequence<__T>, Dafny.ISequence<__T>>.create((s).Take((_104_i).dtor_value), (s).Drop(((_104_i).dtor_value) + (BigInteger.One)));
-    }
-    public static Std.Wrappers._IOption<_System._ITuple2<Dafny.ISequence<__T>, Dafny.ISequence<__T>>> SplitOnceOption<__T>(Dafny.ISequence<__T> s, __T delim) {
-      Std.Wrappers._IOption<BigInteger> _105_valueOrError0 = Std.Collections.Seq.__default.IndexOfOption<__T>(s, delim);
-      if ((_105_valueOrError0).IsFailure()) {
-        return (_105_valueOrError0).PropagateFailure<_System._ITuple2<Dafny.ISequence<__T>, Dafny.ISequence<__T>>>();
-      } else {
-        BigInteger _106_i = (_105_valueOrError0).Extract();
-        return Std.Wrappers.Option<_System._ITuple2<Dafny.ISequence<__T>, Dafny.ISequence<__T>>>.create_Some(_System.Tuple2<Dafny.ISequence<__T>, Dafny.ISequence<__T>>.create((s).Take(_106_i), (s).Drop((_106_i) + (BigInteger.One))));
-      }
-    }
-    public static Dafny.ISequence<__R> Map<__T, __R>(Func<__T, __R> f, Dafny.ISequence<__T> xs) {
-      Dafny.ISequence<__R> _107___accumulator = Dafny.Sequence<__R>.FromElements();
-    TAIL_CALL_START:;
-      if ((new BigInteger((xs).Count)).Sign == 0) {
-        return Dafny.Sequence<__R>.Concat(_107___accumulator, Dafny.Sequence<__R>.FromElements());
-      } else {
-        _107___accumulator = Dafny.Sequence<__R>.Concat(_107___accumulator, Dafny.Sequence<__R>.FromElements(Dafny.Helpers.Id<Func<__T, __R>>(f)((xs).Select(BigInteger.Zero))));
-        Func<__T, __R> _in17 = f;
-        Dafny.ISequence<__T> _in18 = (xs).Drop(BigInteger.One);
-        f = _in17;
-        xs = _in18;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static Std.Wrappers._IResult<Dafny.ISequence<__R>, __E> MapWithResult<__T, __R, __E>(Func<__T, Std.Wrappers._IResult<__R, __E>> f, Dafny.ISequence<__T> xs) {
-      if ((new BigInteger((xs).Count)).Sign == 0) {
-        return Std.Wrappers.Result<Dafny.ISequence<__R>, __E>.create_Success(Dafny.Sequence<__R>.FromElements());
-      } else {
-        Std.Wrappers._IResult<__R, __E> _108_valueOrError0 = Dafny.Helpers.Id<Func<__T, Std.Wrappers._IResult<__R, __E>>>(f)((xs).Select(BigInteger.Zero));
-        if ((_108_valueOrError0).IsFailure()) {
-          return (_108_valueOrError0).PropagateFailure<Dafny.ISequence<__R>>();
-        } else {
-          __R _109_head = (_108_valueOrError0).Extract();
-          Std.Wrappers._IResult<Dafny.ISequence<__R>, __E> _110_valueOrError1 = Std.Collections.Seq.__default.MapWithResult<__T, __R, __E>(f, (xs).Drop(BigInteger.One));
-          if ((_110_valueOrError1).IsFailure()) {
-            return (_110_valueOrError1).PropagateFailure<Dafny.ISequence<__R>>();
-          } else {
-            Dafny.ISequence<__R> _111_tail = (_110_valueOrError1).Extract();
-            return Std.Wrappers.Result<Dafny.ISequence<__R>, __E>.create_Success(Dafny.Sequence<__R>.Concat(Dafny.Sequence<__R>.FromElements(_109_head), _111_tail));
-          }
-        }
-      }
-    }
-    public static Dafny.ISequence<__T> Filter<__T>(Func<__T, bool> f, Dafny.ISequence<__T> xs) {
-      Dafny.ISequence<__T> _112___accumulator = Dafny.Sequence<__T>.FromElements();
-    TAIL_CALL_START:;
-      if ((new BigInteger((xs).Count)).Sign == 0) {
-        return Dafny.Sequence<__T>.Concat(_112___accumulator, Dafny.Sequence<__T>.FromElements());
-      } else {
-        _112___accumulator = Dafny.Sequence<__T>.Concat(_112___accumulator, ((Dafny.Helpers.Id<Func<__T, bool>>(f)((xs).Select(BigInteger.Zero))) ? (Dafny.Sequence<__T>.FromElements((xs).Select(BigInteger.Zero))) : (Dafny.Sequence<__T>.FromElements())));
-        Func<__T, bool> _in19 = f;
-        Dafny.ISequence<__T> _in20 = (xs).Drop(BigInteger.One);
-        f = _in19;
-        xs = _in20;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static __A FoldLeft<__A, __T>(Func<__A, __T, __A> f, __A init, Dafny.ISequence<__T> xs) {
-    TAIL_CALL_START:;
-      if ((new BigInteger((xs).Count)).Sign == 0) {
-        return init;
-      } else {
-        Func<__A, __T, __A> _in21 = f;
-        __A _in22 = Dafny.Helpers.Id<Func<__A, __T, __A>>(f)(init, (xs).Select(BigInteger.Zero));
-        Dafny.ISequence<__T> _in23 = (xs).Drop(BigInteger.One);
-        f = _in21;
-        init = _in22;
-        xs = _in23;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static __A FoldRight<__A, __T>(Func<__T, __A, __A> f, Dafny.ISequence<__T> xs, __A init) {
-      if ((new BigInteger((xs).Count)).Sign == 0) {
-        return init;
-      } else {
-        return Dafny.Helpers.Id<Func<__T, __A, __A>>(f)((xs).Select(BigInteger.Zero), Std.Collections.Seq.__default.FoldRight<__A, __T>(f, (xs).Drop(BigInteger.One), init));
-      }
-    }
-    public static Dafny.ISequence<__T> SetToSeq<__T>(Dafny.ISet<__T> s) {
-      Dafny.ISequence<__T> xs = Dafny.Sequence<__T>.Empty;
-      xs = Dafny.Sequence<__T>.FromElements();
-      Dafny.ISet<__T> _113_left;
-      _113_left = s;
-      while (!(_113_left).Equals(Dafny.Set<__T>.FromElements())) {
-        __T _114_x;
-        foreach (__T _assign_such_that_0 in (_113_left).Elements) {
-          _114_x = (__T)_assign_such_that_0;
-          if ((_113_left).Contains(_114_x)) {
-            goto after__ASSIGN_SUCH_THAT_0;
-          }
-        }
-        throw new System.Exception("assign-such-that search produced no value (line 7247)");
-      after__ASSIGN_SUCH_THAT_0:;
-        _113_left = Dafny.Set<__T>.Difference(_113_left, Dafny.Set<__T>.FromElements(_114_x));
-        xs = Dafny.Sequence<__T>.Concat(xs, Dafny.Sequence<__T>.FromElements(_114_x));
-      }
-      return xs;
-    }
-    public static Dafny.ISequence<__T> SetToSortedSeq<__T>(Dafny.ISet<__T> s, Func<__T, __T, bool> R) {
-      Dafny.ISequence<__T> xs = Dafny.Sequence<__T>.Empty;
-      Dafny.ISequence<__T> _out6;
-      _out6 = Std.Collections.Seq.__default.SetToSeq<__T>(s);
-      xs = _out6;
-      xs = Std.Collections.Seq.__default.MergeSortBy<__T>(R, xs);
-      return xs;
-    }
-    public static Dafny.ISequence<__T> MergeSortBy<__T>(Func<__T, __T, bool> lessThanOrEq, Dafny.ISequence<__T> a) {
-      if ((new BigInteger((a).Count)) <= (BigInteger.One)) {
-        return a;
-      } else {
-        BigInteger _115_splitIndex = Dafny.Helpers.EuclideanDivision(new BigInteger((a).Count), new BigInteger(2));
-        Dafny.ISequence<__T> _116_left = (a).Take(_115_splitIndex);
-        Dafny.ISequence<__T> _117_right = (a).Drop(_115_splitIndex);
-        Dafny.ISequence<__T> _118_leftSorted = Std.Collections.Seq.__default.MergeSortBy<__T>(lessThanOrEq, _116_left);
-        Dafny.ISequence<__T> _119_rightSorted = Std.Collections.Seq.__default.MergeSortBy<__T>(lessThanOrEq, _117_right);
-        return Std.Collections.Seq.__default.MergeSortedWith<__T>(_118_leftSorted, _119_rightSorted, lessThanOrEq);
-      }
-    }
-    public static Dafny.ISequence<__T> MergeSortedWith<__T>(Dafny.ISequence<__T> left, Dafny.ISequence<__T> right, Func<__T, __T, bool> lessThanOrEq) {
-      Dafny.ISequence<__T> _120___accumulator = Dafny.Sequence<__T>.FromElements();
-    TAIL_CALL_START:;
-      if ((new BigInteger((left).Count)).Sign == 0) {
-        return Dafny.Sequence<__T>.Concat(_120___accumulator, right);
-      } else if ((new BigInteger((right).Count)).Sign == 0) {
-        return Dafny.Sequence<__T>.Concat(_120___accumulator, left);
-      } else if (Dafny.Helpers.Id<Func<__T, __T, bool>>(lessThanOrEq)((left).Select(BigInteger.Zero), (right).Select(BigInteger.Zero))) {
-        _120___accumulator = Dafny.Sequence<__T>.Concat(_120___accumulator, Dafny.Sequence<__T>.FromElements((left).Select(BigInteger.Zero)));
-        Dafny.ISequence<__T> _in24 = (left).Drop(BigInteger.One);
-        Dafny.ISequence<__T> _in25 = right;
-        Func<__T, __T, bool> _in26 = lessThanOrEq;
-        left = _in24;
-        right = _in25;
-        lessThanOrEq = _in26;
-        goto TAIL_CALL_START;
-      } else {
-        _120___accumulator = Dafny.Sequence<__T>.Concat(_120___accumulator, Dafny.Sequence<__T>.FromElements((right).Select(BigInteger.Zero)));
-        Dafny.ISequence<__T> _in27 = left;
-        Dafny.ISequence<__T> _in28 = (right).Drop(BigInteger.One);
-        Func<__T, __T, bool> _in29 = lessThanOrEq;
-        left = _in27;
-        right = _in28;
-        lessThanOrEq = _in29;
-        goto TAIL_CALL_START;
-      }
-    }
-  }
-} // end of namespace Std.Collections.Seq
-namespace Std.Arithmetic.GeneralInternals {
-
-} // end of namespace Std.Arithmetic.GeneralInternals
-namespace Std.Arithmetic.MulInternalsNonlinear {
-
-} // end of namespace Std.Arithmetic.MulInternalsNonlinear
-namespace Std.Arithmetic.MulInternals {
-
-  public partial class __default {
-    public static BigInteger MulPos(BigInteger x, BigInteger y) {
-      BigInteger _149___accumulator = BigInteger.Zero;
-    TAIL_CALL_START:;
-      if ((x).Sign == 0) {
-        return (BigInteger.Zero) + (_149___accumulator);
-      } else {
-        _149___accumulator = (_149___accumulator) + (y);
-        BigInteger _in32 = (x) - (BigInteger.One);
-        BigInteger _in33 = y;
-        x = _in32;
-        y = _in33;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static BigInteger MulRecursive(BigInteger x, BigInteger y) {
-      if ((x).Sign != -1) {
-        return Std.Arithmetic.MulInternals.__default.MulPos(x, y);
-      } else {
-        return (new BigInteger(-1)) * (Std.Arithmetic.MulInternals.__default.MulPos((new BigInteger(-1)) * (x), y));
-      }
-    }
-  }
-} // end of namespace Std.Arithmetic.MulInternals
-namespace Std.Arithmetic.Mul {
-
-} // end of namespace Std.Arithmetic.Mul
-namespace Std.Arithmetic.ModInternalsNonlinear {
-
-} // end of namespace Std.Arithmetic.ModInternalsNonlinear
-namespace Std.Arithmetic.DivInternalsNonlinear {
-
-} // end of namespace Std.Arithmetic.DivInternalsNonlinear
-namespace Std.Arithmetic.ModInternals {
-
-  public partial class __default {
-    public static BigInteger ModRecursive(BigInteger x, BigInteger d) {
-    TAIL_CALL_START:;
-      if ((x).Sign == -1) {
-        BigInteger _in34 = (d) + (x);
-        BigInteger _in35 = d;
-        x = _in34;
-        d = _in35;
-        goto TAIL_CALL_START;
-      } else if ((x) < (d)) {
-        return x;
-      } else {
-        BigInteger _in36 = (x) - (d);
-        BigInteger _in37 = d;
-        x = _in36;
-        d = _in37;
-        goto TAIL_CALL_START;
-      }
-    }
-  }
-} // end of namespace Std.Arithmetic.ModInternals
-namespace Std.Arithmetic.DivInternals {
-
-  public partial class __default {
-    public static BigInteger DivPos(BigInteger x, BigInteger d) {
-      BigInteger _150___accumulator = BigInteger.Zero;
-    TAIL_CALL_START:;
-      if ((x).Sign == -1) {
-        _150___accumulator = (_150___accumulator) + (new BigInteger(-1));
-        BigInteger _in38 = (x) + (d);
-        BigInteger _in39 = d;
-        x = _in38;
-        d = _in39;
-        goto TAIL_CALL_START;
-      } else if ((x) < (d)) {
-        return (BigInteger.Zero) + (_150___accumulator);
-      } else {
-        _150___accumulator = (_150___accumulator) + (BigInteger.One);
-        BigInteger _in40 = (x) - (d);
-        BigInteger _in41 = d;
-        x = _in40;
-        d = _in41;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static BigInteger DivRecursive(BigInteger x, BigInteger d) {
-      if ((d).Sign == 1) {
-        return Std.Arithmetic.DivInternals.__default.DivPos(x, d);
-      } else {
-        return (new BigInteger(-1)) * (Std.Arithmetic.DivInternals.__default.DivPos(x, (new BigInteger(-1)) * (d)));
-      }
-    }
-  }
-} // end of namespace Std.Arithmetic.DivInternals
-namespace Std.Arithmetic.DivMod {
-
-  public partial class __default {
-    public static bool MultiplesVanish(BigInteger a, BigInteger b, BigInteger m) {
-      return (Dafny.Helpers.EuclideanModulus(((m) * (a)) + (b), m)) == (Dafny.Helpers.EuclideanModulus(b, m));
-    }
-  }
-} // end of namespace Std.Arithmetic.DivMod
-namespace Std.Arithmetic.Power {
-
-  public partial class __default {
-    public static BigInteger Pow(BigInteger b, BigInteger e) {
-      BigInteger _151___accumulator = BigInteger.One;
-    TAIL_CALL_START:;
-      if ((e).Sign == 0) {
-        return (BigInteger.One) * (_151___accumulator);
-      } else {
-        _151___accumulator = (_151___accumulator) * (b);
-        BigInteger _in42 = b;
-        BigInteger _in43 = (e) - (BigInteger.One);
-        b = _in42;
-        e = _in43;
-        goto TAIL_CALL_START;
-      }
-    }
-  }
-} // end of namespace Std.Arithmetic.Power
-namespace Std.Arithmetic.Logarithm {
-
-  public partial class __default {
-    public static BigInteger Log(BigInteger @base, BigInteger pow) {
-      BigInteger _152___accumulator = BigInteger.Zero;
-    TAIL_CALL_START:;
-      if ((pow) < (@base)) {
-        return (BigInteger.Zero) + (_152___accumulator);
-      } else {
-        _152___accumulator = (_152___accumulator) + (BigInteger.One);
-        BigInteger _in44 = @base;
-        BigInteger _in45 = Dafny.Helpers.EuclideanDivision(pow, @base);
-        @base = _in44;
-        pow = _in45;
-        goto TAIL_CALL_START;
-      }
-    }
-  }
-} // end of namespace Std.Arithmetic.Logarithm
-namespace Std.Arithmetic.Power2 {
-
-  public partial class __default {
-    public static BigInteger Pow2(BigInteger e) {
-      return Std.Arithmetic.Power.__default.Pow(new BigInteger(2), e);
-    }
-  }
-} // end of namespace Std.Arithmetic.Power2
-namespace Std.Arithmetic {
-
-} // end of namespace Std.Arithmetic
-namespace Std.Strings.HexConversion {
-
-  public partial class __default {
-    public static BigInteger BASE() {
-      return Std.Strings.HexConversion.__default.@base;
-    }
-    public static bool IsDigitChar(Dafny.Rune c) {
-      return (Std.Strings.HexConversion.__default.charToDigit).Contains(c);
-    }
-    public static Dafny.ISequence<Dafny.Rune> OfDigits(Dafny.ISequence<BigInteger> digits) {
-      Dafny.ISequence<Dafny.Rune> _153___accumulator = Dafny.Sequence<Dafny.Rune>.FromElements();
-    TAIL_CALL_START:;
-      if ((digits).Equals(Dafny.Sequence<BigInteger>.FromElements())) {
-        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.FromElements(), _153___accumulator);
-      } else {
-        _153___accumulator = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.FromElements((Std.Strings.HexConversion.__default.chars).Select((digits).Select(BigInteger.Zero))), _153___accumulator);
-        Dafny.ISequence<BigInteger> _in46 = (digits).Drop(BigInteger.One);
-        digits = _in46;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static Dafny.ISequence<Dafny.Rune> OfNat(BigInteger n) {
-      if ((n).Sign == 0) {
-        return Dafny.Sequence<Dafny.Rune>.FromElements((Std.Strings.HexConversion.__default.chars).Select(BigInteger.Zero));
-      } else {
-        return Std.Strings.HexConversion.__default.OfDigits(Std.Strings.HexConversion.__default.FromNat(n));
-      }
-    }
-    public static bool IsNumberStr(Dafny.ISequence<Dafny.Rune> str, Dafny.Rune minus) {
-      return !(!(str).Equals(Dafny.Sequence<Dafny.Rune>.FromElements())) || (((((str).Select(BigInteger.Zero)) == (minus)) || ((Std.Strings.HexConversion.__default.charToDigit).Contains((str).Select(BigInteger.Zero)))) && (Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, bool>>((_154_str) => Dafny.Helpers.Quantifier<Dafny.Rune>(((_154_str).Drop(BigInteger.One)).UniqueElements, true, (((_forall_var_1) => {
-        Dafny.Rune _155_c = (Dafny.Rune)_forall_var_1;
-        return !(((_154_str).Drop(BigInteger.One)).Contains(_155_c)) || (Std.Strings.HexConversion.__default.IsDigitChar(_155_c));
-      }))))(str)));
-    }
-    public static Dafny.ISequence<Dafny.Rune> OfInt(BigInteger n, Dafny.Rune minus) {
-      if ((n).Sign != -1) {
-        return Std.Strings.HexConversion.__default.OfNat(n);
-      } else {
-        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.FromElements(minus), Std.Strings.HexConversion.__default.OfNat((BigInteger.Zero) - (n)));
-      }
-    }
-    public static BigInteger ToNat(Dafny.ISequence<Dafny.Rune> str) {
-      if ((str).Equals(Dafny.Sequence<Dafny.Rune>.FromElements())) {
-        return BigInteger.Zero;
-      } else {
-        Dafny.Rune _156_c = (str).Select((new BigInteger((str).Count)) - (BigInteger.One));
-        return ((Std.Strings.HexConversion.__default.ToNat((str).Take((new BigInteger((str).Count)) - (BigInteger.One)))) * (Std.Strings.HexConversion.__default.@base)) + (Dafny.Map<Dafny.Rune, BigInteger>.Select(Std.Strings.HexConversion.__default.charToDigit, _156_c));
-      }
-    }
-    public static BigInteger ToInt(Dafny.ISequence<Dafny.Rune> str, Dafny.Rune minus) {
-      if (Dafny.Sequence<Dafny.Rune>.IsPrefixOf(Dafny.Sequence<Dafny.Rune>.FromElements(minus), str)) {
-        return (BigInteger.Zero) - (Std.Strings.HexConversion.__default.ToNat((str).Drop(BigInteger.One)));
-      } else {
-        return Std.Strings.HexConversion.__default.ToNat(str);
-      }
-    }
-    public static BigInteger ToNatRight(Dafny.ISequence<BigInteger> xs) {
-      if ((new BigInteger((xs).Count)).Sign == 0) {
-        return BigInteger.Zero;
-      } else {
-        return ((Std.Strings.HexConversion.__default.ToNatRight(Std.Collections.Seq.__default.DropFirst<BigInteger>(xs))) * (Std.Strings.HexConversion.__default.BASE())) + (Std.Collections.Seq.__default.First<BigInteger>(xs));
-      }
-    }
-    public static BigInteger ToNatLeft(Dafny.ISequence<BigInteger> xs) {
-      BigInteger _157___accumulator = BigInteger.Zero;
-    TAIL_CALL_START:;
-      if ((new BigInteger((xs).Count)).Sign == 0) {
-        return (BigInteger.Zero) + (_157___accumulator);
-      } else {
-        _157___accumulator = ((Std.Collections.Seq.__default.Last<BigInteger>(xs)) * (Std.Arithmetic.Power.__default.Pow(Std.Strings.HexConversion.__default.BASE(), (new BigInteger((xs).Count)) - (BigInteger.One)))) + (_157___accumulator);
-        Dafny.ISequence<BigInteger> _in47 = Std.Collections.Seq.__default.DropLast<BigInteger>(xs);
-        xs = _in47;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static Dafny.ISequence<BigInteger> FromNat(BigInteger n) {
-      Dafny.ISequence<BigInteger> _158___accumulator = Dafny.Sequence<BigInteger>.FromElements();
-    TAIL_CALL_START:;
-      if ((n).Sign == 0) {
-        return Dafny.Sequence<BigInteger>.Concat(_158___accumulator, Dafny.Sequence<BigInteger>.FromElements());
-      } else {
-        _158___accumulator = Dafny.Sequence<BigInteger>.Concat(_158___accumulator, Dafny.Sequence<BigInteger>.FromElements(Dafny.Helpers.EuclideanModulus(n, Std.Strings.HexConversion.__default.BASE())));
-        BigInteger _in48 = Dafny.Helpers.EuclideanDivision(n, Std.Strings.HexConversion.__default.BASE());
-        n = _in48;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static Dafny.ISequence<BigInteger> SeqExtend(Dafny.ISequence<BigInteger> xs, BigInteger n) {
-    TAIL_CALL_START:;
-      if ((new BigInteger((xs).Count)) >= (n)) {
-        return xs;
-      } else {
-        Dafny.ISequence<BigInteger> _in49 = Dafny.Sequence<BigInteger>.Concat(xs, Dafny.Sequence<BigInteger>.FromElements(BigInteger.Zero));
-        BigInteger _in50 = n;
-        xs = _in49;
-        n = _in50;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static Dafny.ISequence<BigInteger> SeqExtendMultiple(Dafny.ISequence<BigInteger> xs, BigInteger n) {
-      BigInteger _159_newLen = ((new BigInteger((xs).Count)) + (n)) - (Dafny.Helpers.EuclideanModulus(new BigInteger((xs).Count), n));
-      return Std.Strings.HexConversion.__default.SeqExtend(xs, _159_newLen);
-    }
-    public static Dafny.ISequence<BigInteger> FromNatWithLen(BigInteger n, BigInteger len) {
-      return Std.Strings.HexConversion.__default.SeqExtend(Std.Strings.HexConversion.__default.FromNat(n), len);
-    }
-    public static Dafny.ISequence<BigInteger> SeqZero(BigInteger len) {
-      Dafny.ISequence<BigInteger> _160_xs = Std.Strings.HexConversion.__default.FromNatWithLen(BigInteger.Zero, len);
-      return _160_xs;
-    }
-    public static _System._ITuple2<Dafny.ISequence<BigInteger>, BigInteger> SeqAdd(Dafny.ISequence<BigInteger> xs, Dafny.ISequence<BigInteger> ys) {
-      if ((new BigInteger((xs).Count)).Sign == 0) {
-        return _System.Tuple2<Dafny.ISequence<BigInteger>, BigInteger>.create(Dafny.Sequence<BigInteger>.FromElements(), BigInteger.Zero);
-      } else {
-        _System._ITuple2<Dafny.ISequence<BigInteger>, BigInteger> _let_tmp_rhs1 = Std.Strings.HexConversion.__default.SeqAdd(Std.Collections.Seq.__default.DropLast<BigInteger>(xs), Std.Collections.Seq.__default.DropLast<BigInteger>(ys));
-        Dafny.ISequence<BigInteger> _161_zs_k = _let_tmp_rhs1.dtor__0;
-        BigInteger _162_cin = _let_tmp_rhs1.dtor__1;
-        BigInteger _163_sum = ((Std.Collections.Seq.__default.Last<BigInteger>(xs)) + (Std.Collections.Seq.__default.Last<BigInteger>(ys))) + (_162_cin);
-        _System._ITuple2<BigInteger, BigInteger> _let_tmp_rhs2 = (((_163_sum) < (Std.Strings.HexConversion.__default.BASE())) ? (_System.Tuple2<BigInteger, BigInteger>.create(_163_sum, BigInteger.Zero)) : (_System.Tuple2<BigInteger, BigInteger>.create((_163_sum) - (Std.Strings.HexConversion.__default.BASE()), BigInteger.One)));
-        BigInteger _164_sum__out = _let_tmp_rhs2.dtor__0;
-        BigInteger _165_cout = _let_tmp_rhs2.dtor__1;
-        return _System.Tuple2<Dafny.ISequence<BigInteger>, BigInteger>.create(Dafny.Sequence<BigInteger>.Concat(_161_zs_k, Dafny.Sequence<BigInteger>.FromElements(_164_sum__out)), _165_cout);
-      }
-    }
-    public static _System._ITuple2<Dafny.ISequence<BigInteger>, BigInteger> SeqSub(Dafny.ISequence<BigInteger> xs, Dafny.ISequence<BigInteger> ys) {
-      if ((new BigInteger((xs).Count)).Sign == 0) {
-        return _System.Tuple2<Dafny.ISequence<BigInteger>, BigInteger>.create(Dafny.Sequence<BigInteger>.FromElements(), BigInteger.Zero);
-      } else {
-        _System._ITuple2<Dafny.ISequence<BigInteger>, BigInteger> _let_tmp_rhs3 = Std.Strings.HexConversion.__default.SeqSub(Std.Collections.Seq.__default.DropLast<BigInteger>(xs), Std.Collections.Seq.__default.DropLast<BigInteger>(ys));
-        Dafny.ISequence<BigInteger> _166_zs = _let_tmp_rhs3.dtor__0;
-        BigInteger _167_cin = _let_tmp_rhs3.dtor__1;
-        _System._ITuple2<BigInteger, BigInteger> _let_tmp_rhs4 = (((Std.Collections.Seq.__default.Last<BigInteger>(xs)) >= ((Std.Collections.Seq.__default.Last<BigInteger>(ys)) + (_167_cin))) ? (_System.Tuple2<BigInteger, BigInteger>.create(((Std.Collections.Seq.__default.Last<BigInteger>(xs)) - (Std.Collections.Seq.__default.Last<BigInteger>(ys))) - (_167_cin), BigInteger.Zero)) : (_System.Tuple2<BigInteger, BigInteger>.create((((Std.Strings.HexConversion.__default.BASE()) + (Std.Collections.Seq.__default.Last<BigInteger>(xs))) - (Std.Collections.Seq.__default.Last<BigInteger>(ys))) - (_167_cin), BigInteger.One)));
-        BigInteger _168_diff__out = _let_tmp_rhs4.dtor__0;
-        BigInteger _169_cout = _let_tmp_rhs4.dtor__1;
-        return _System.Tuple2<Dafny.ISequence<BigInteger>, BigInteger>.create(Dafny.Sequence<BigInteger>.Concat(_166_zs, Dafny.Sequence<BigInteger>.FromElements(_168_diff__out)), _169_cout);
-      }
-    }
-    public static Dafny.ISequence<Dafny.Rune> HEX__DIGITS {
-      get {
-        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("0123456789ABCDEF");
-      }
-    }
-    public static Dafny.ISequence<Dafny.Rune> chars {
-      get {
-        return Std.Strings.HexConversion.__default.HEX__DIGITS;
-      }
-    }
-    public static BigInteger @base {
-      get {
-        return new BigInteger((Std.Strings.HexConversion.__default.chars).Count);
-      }
-    }
-    public static Dafny.IMap<Dafny.Rune, BigInteger> charToDigit {
-      get {
-        return Dafny.Map<Dafny.Rune, BigInteger>.FromElements(new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('0'), BigInteger.Zero), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('1'), BigInteger.One), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('2'), new BigInteger(2)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('3'), new BigInteger(3)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('4'), new BigInteger(4)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('5'), new BigInteger(5)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('6'), new BigInteger(6)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('7'), new BigInteger(7)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('8'), new BigInteger(8)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('9'), new BigInteger(9)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('a'), new BigInteger(10)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('b'), new BigInteger(11)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('c'), new BigInteger(12)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('d'), new BigInteger(13)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('e'), new BigInteger(14)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('f'), new BigInteger(15)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('A'), new BigInteger(10)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('B'), new BigInteger(11)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('C'), new BigInteger(12)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('D'), new BigInteger(13)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('E'), new BigInteger(14)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('F'), new BigInteger(15)));
-      }
-    }
-  }
-
-  public partial class CharSeq {
-    private static readonly Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>> _TYPE = new Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>>(Dafny.Sequence<Dafny.Rune>.Empty);
-    public static Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static bool _Is(Dafny.ISequence<Dafny.Rune> __source) {
-      Dafny.ISequence<Dafny.Rune> _170_chars = __source;
-      return (new BigInteger((_170_chars).Count)) > (BigInteger.One);
-    }
-  }
-
-  public partial class digit {
-    private static readonly Dafny.TypeDescriptor<BigInteger> _TYPE = new Dafny.TypeDescriptor<BigInteger>(BigInteger.Zero);
-    public static Dafny.TypeDescriptor<BigInteger> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static bool _Is(BigInteger __source) {
-      BigInteger _171_i = __source;
-      if (_System.nat._Is(_171_i)) {
-        return ((_171_i).Sign != -1) && ((_171_i) < (Std.Strings.HexConversion.__default.BASE()));
-      }
-      return false;
-    }
-  }
-} // end of namespace Std.Strings.HexConversion
-namespace Std.Strings.DecimalConversion {
-
-  public partial class __default {
-    public static BigInteger BASE() {
-      return Std.Strings.DecimalConversion.__default.@base;
-    }
-    public static bool IsDigitChar(Dafny.Rune c) {
-      return (Std.Strings.DecimalConversion.__default.charToDigit).Contains(c);
-    }
-    public static Dafny.ISequence<Dafny.Rune> OfDigits(Dafny.ISequence<BigInteger> digits) {
-      Dafny.ISequence<Dafny.Rune> _172___accumulator = Dafny.Sequence<Dafny.Rune>.FromElements();
-    TAIL_CALL_START:;
-      if ((digits).Equals(Dafny.Sequence<BigInteger>.FromElements())) {
-        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.FromElements(), _172___accumulator);
-      } else {
-        _172___accumulator = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.FromElements((Std.Strings.DecimalConversion.__default.chars).Select((digits).Select(BigInteger.Zero))), _172___accumulator);
-        Dafny.ISequence<BigInteger> _in51 = (digits).Drop(BigInteger.One);
-        digits = _in51;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static Dafny.ISequence<Dafny.Rune> OfNat(BigInteger n) {
-      if ((n).Sign == 0) {
-        return Dafny.Sequence<Dafny.Rune>.FromElements((Std.Strings.DecimalConversion.__default.chars).Select(BigInteger.Zero));
-      } else {
-        return Std.Strings.DecimalConversion.__default.OfDigits(Std.Strings.DecimalConversion.__default.FromNat(n));
-      }
-    }
-    public static bool IsNumberStr(Dafny.ISequence<Dafny.Rune> str, Dafny.Rune minus) {
-      return !(!(str).Equals(Dafny.Sequence<Dafny.Rune>.FromElements())) || (((((str).Select(BigInteger.Zero)) == (minus)) || ((Std.Strings.DecimalConversion.__default.charToDigit).Contains((str).Select(BigInteger.Zero)))) && (Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, bool>>((_173_str) => Dafny.Helpers.Quantifier<Dafny.Rune>(((_173_str).Drop(BigInteger.One)).UniqueElements, true, (((_forall_var_2) => {
-        Dafny.Rune _174_c = (Dafny.Rune)_forall_var_2;
-        return !(((_173_str).Drop(BigInteger.One)).Contains(_174_c)) || (Std.Strings.DecimalConversion.__default.IsDigitChar(_174_c));
-      }))))(str)));
-    }
-    public static Dafny.ISequence<Dafny.Rune> OfInt(BigInteger n, Dafny.Rune minus) {
-      if ((n).Sign != -1) {
-        return Std.Strings.DecimalConversion.__default.OfNat(n);
-      } else {
-        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.FromElements(minus), Std.Strings.DecimalConversion.__default.OfNat((BigInteger.Zero) - (n)));
-      }
-    }
-    public static BigInteger ToNat(Dafny.ISequence<Dafny.Rune> str) {
-      if ((str).Equals(Dafny.Sequence<Dafny.Rune>.FromElements())) {
-        return BigInteger.Zero;
-      } else {
-        Dafny.Rune _175_c = (str).Select((new BigInteger((str).Count)) - (BigInteger.One));
-        return ((Std.Strings.DecimalConversion.__default.ToNat((str).Take((new BigInteger((str).Count)) - (BigInteger.One)))) * (Std.Strings.DecimalConversion.__default.@base)) + (Dafny.Map<Dafny.Rune, BigInteger>.Select(Std.Strings.DecimalConversion.__default.charToDigit, _175_c));
-      }
-    }
-    public static BigInteger ToInt(Dafny.ISequence<Dafny.Rune> str, Dafny.Rune minus) {
-      if (Dafny.Sequence<Dafny.Rune>.IsPrefixOf(Dafny.Sequence<Dafny.Rune>.FromElements(minus), str)) {
-        return (BigInteger.Zero) - (Std.Strings.DecimalConversion.__default.ToNat((str).Drop(BigInteger.One)));
-      } else {
-        return Std.Strings.DecimalConversion.__default.ToNat(str);
-      }
-    }
-    public static BigInteger ToNatRight(Dafny.ISequence<BigInteger> xs) {
-      if ((new BigInteger((xs).Count)).Sign == 0) {
-        return BigInteger.Zero;
-      } else {
-        return ((Std.Strings.DecimalConversion.__default.ToNatRight(Std.Collections.Seq.__default.DropFirst<BigInteger>(xs))) * (Std.Strings.DecimalConversion.__default.BASE())) + (Std.Collections.Seq.__default.First<BigInteger>(xs));
-      }
-    }
-    public static BigInteger ToNatLeft(Dafny.ISequence<BigInteger> xs) {
-      BigInteger _176___accumulator = BigInteger.Zero;
-    TAIL_CALL_START:;
-      if ((new BigInteger((xs).Count)).Sign == 0) {
-        return (BigInteger.Zero) + (_176___accumulator);
-      } else {
-        _176___accumulator = ((Std.Collections.Seq.__default.Last<BigInteger>(xs)) * (Std.Arithmetic.Power.__default.Pow(Std.Strings.DecimalConversion.__default.BASE(), (new BigInteger((xs).Count)) - (BigInteger.One)))) + (_176___accumulator);
-        Dafny.ISequence<BigInteger> _in52 = Std.Collections.Seq.__default.DropLast<BigInteger>(xs);
-        xs = _in52;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static Dafny.ISequence<BigInteger> FromNat(BigInteger n) {
-      Dafny.ISequence<BigInteger> _177___accumulator = Dafny.Sequence<BigInteger>.FromElements();
-    TAIL_CALL_START:;
-      if ((n).Sign == 0) {
-        return Dafny.Sequence<BigInteger>.Concat(_177___accumulator, Dafny.Sequence<BigInteger>.FromElements());
-      } else {
-        _177___accumulator = Dafny.Sequence<BigInteger>.Concat(_177___accumulator, Dafny.Sequence<BigInteger>.FromElements(Dafny.Helpers.EuclideanModulus(n, Std.Strings.DecimalConversion.__default.BASE())));
-        BigInteger _in53 = Dafny.Helpers.EuclideanDivision(n, Std.Strings.DecimalConversion.__default.BASE());
-        n = _in53;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static Dafny.ISequence<BigInteger> SeqExtend(Dafny.ISequence<BigInteger> xs, BigInteger n) {
-    TAIL_CALL_START:;
-      if ((new BigInteger((xs).Count)) >= (n)) {
-        return xs;
-      } else {
-        Dafny.ISequence<BigInteger> _in54 = Dafny.Sequence<BigInteger>.Concat(xs, Dafny.Sequence<BigInteger>.FromElements(BigInteger.Zero));
-        BigInteger _in55 = n;
-        xs = _in54;
-        n = _in55;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static Dafny.ISequence<BigInteger> SeqExtendMultiple(Dafny.ISequence<BigInteger> xs, BigInteger n) {
-      BigInteger _178_newLen = ((new BigInteger((xs).Count)) + (n)) - (Dafny.Helpers.EuclideanModulus(new BigInteger((xs).Count), n));
-      return Std.Strings.DecimalConversion.__default.SeqExtend(xs, _178_newLen);
-    }
-    public static Dafny.ISequence<BigInteger> FromNatWithLen(BigInteger n, BigInteger len) {
-      return Std.Strings.DecimalConversion.__default.SeqExtend(Std.Strings.DecimalConversion.__default.FromNat(n), len);
-    }
-    public static Dafny.ISequence<BigInteger> SeqZero(BigInteger len) {
-      Dafny.ISequence<BigInteger> _179_xs = Std.Strings.DecimalConversion.__default.FromNatWithLen(BigInteger.Zero, len);
-      return _179_xs;
-    }
-    public static _System._ITuple2<Dafny.ISequence<BigInteger>, BigInteger> SeqAdd(Dafny.ISequence<BigInteger> xs, Dafny.ISequence<BigInteger> ys) {
-      if ((new BigInteger((xs).Count)).Sign == 0) {
-        return _System.Tuple2<Dafny.ISequence<BigInteger>, BigInteger>.create(Dafny.Sequence<BigInteger>.FromElements(), BigInteger.Zero);
-      } else {
-        _System._ITuple2<Dafny.ISequence<BigInteger>, BigInteger> _let_tmp_rhs5 = Std.Strings.DecimalConversion.__default.SeqAdd(Std.Collections.Seq.__default.DropLast<BigInteger>(xs), Std.Collections.Seq.__default.DropLast<BigInteger>(ys));
-        Dafny.ISequence<BigInteger> _180_zs_k = _let_tmp_rhs5.dtor__0;
-        BigInteger _181_cin = _let_tmp_rhs5.dtor__1;
-        BigInteger _182_sum = ((Std.Collections.Seq.__default.Last<BigInteger>(xs)) + (Std.Collections.Seq.__default.Last<BigInteger>(ys))) + (_181_cin);
-        _System._ITuple2<BigInteger, BigInteger> _let_tmp_rhs6 = (((_182_sum) < (Std.Strings.DecimalConversion.__default.BASE())) ? (_System.Tuple2<BigInteger, BigInteger>.create(_182_sum, BigInteger.Zero)) : (_System.Tuple2<BigInteger, BigInteger>.create((_182_sum) - (Std.Strings.DecimalConversion.__default.BASE()), BigInteger.One)));
-        BigInteger _183_sum__out = _let_tmp_rhs6.dtor__0;
-        BigInteger _184_cout = _let_tmp_rhs6.dtor__1;
-        return _System.Tuple2<Dafny.ISequence<BigInteger>, BigInteger>.create(Dafny.Sequence<BigInteger>.Concat(_180_zs_k, Dafny.Sequence<BigInteger>.FromElements(_183_sum__out)), _184_cout);
-      }
-    }
-    public static _System._ITuple2<Dafny.ISequence<BigInteger>, BigInteger> SeqSub(Dafny.ISequence<BigInteger> xs, Dafny.ISequence<BigInteger> ys) {
-      if ((new BigInteger((xs).Count)).Sign == 0) {
-        return _System.Tuple2<Dafny.ISequence<BigInteger>, BigInteger>.create(Dafny.Sequence<BigInteger>.FromElements(), BigInteger.Zero);
-      } else {
-        _System._ITuple2<Dafny.ISequence<BigInteger>, BigInteger> _let_tmp_rhs7 = Std.Strings.DecimalConversion.__default.SeqSub(Std.Collections.Seq.__default.DropLast<BigInteger>(xs), Std.Collections.Seq.__default.DropLast<BigInteger>(ys));
-        Dafny.ISequence<BigInteger> _185_zs = _let_tmp_rhs7.dtor__0;
-        BigInteger _186_cin = _let_tmp_rhs7.dtor__1;
-        _System._ITuple2<BigInteger, BigInteger> _let_tmp_rhs8 = (((Std.Collections.Seq.__default.Last<BigInteger>(xs)) >= ((Std.Collections.Seq.__default.Last<BigInteger>(ys)) + (_186_cin))) ? (_System.Tuple2<BigInteger, BigInteger>.create(((Std.Collections.Seq.__default.Last<BigInteger>(xs)) - (Std.Collections.Seq.__default.Last<BigInteger>(ys))) - (_186_cin), BigInteger.Zero)) : (_System.Tuple2<BigInteger, BigInteger>.create((((Std.Strings.DecimalConversion.__default.BASE()) + (Std.Collections.Seq.__default.Last<BigInteger>(xs))) - (Std.Collections.Seq.__default.Last<BigInteger>(ys))) - (_186_cin), BigInteger.One)));
-        BigInteger _187_diff__out = _let_tmp_rhs8.dtor__0;
-        BigInteger _188_cout = _let_tmp_rhs8.dtor__1;
-        return _System.Tuple2<Dafny.ISequence<BigInteger>, BigInteger>.create(Dafny.Sequence<BigInteger>.Concat(_185_zs, Dafny.Sequence<BigInteger>.FromElements(_187_diff__out)), _188_cout);
-      }
-    }
-    public static Dafny.ISequence<Dafny.Rune> DIGITS {
-      get {
-        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("0123456789");
-      }
-    }
-    public static Dafny.ISequence<Dafny.Rune> chars {
-      get {
-        return Std.Strings.DecimalConversion.__default.DIGITS;
-      }
-    }
-    public static BigInteger @base {
-      get {
-        return new BigInteger((Std.Strings.DecimalConversion.__default.chars).Count);
-      }
-    }
-    public static Dafny.IMap<Dafny.Rune, BigInteger> charToDigit {
-      get {
-        return Dafny.Map<Dafny.Rune, BigInteger>.FromElements(new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('0'), BigInteger.Zero), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('1'), BigInteger.One), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('2'), new BigInteger(2)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('3'), new BigInteger(3)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('4'), new BigInteger(4)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('5'), new BigInteger(5)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('6'), new BigInteger(6)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('7'), new BigInteger(7)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('8'), new BigInteger(8)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('9'), new BigInteger(9)));
-      }
-    }
-  }
-
-  public partial class CharSeq {
-    private static readonly Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>> _TYPE = new Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>>(Dafny.Sequence<Dafny.Rune>.Empty);
-    public static Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static bool _Is(Dafny.ISequence<Dafny.Rune> __source) {
-      Dafny.ISequence<Dafny.Rune> _189_chars = __source;
-      return (new BigInteger((_189_chars).Count)) > (BigInteger.One);
-    }
-  }
-
-  public partial class digit {
-    private static readonly Dafny.TypeDescriptor<BigInteger> _TYPE = new Dafny.TypeDescriptor<BigInteger>(BigInteger.Zero);
-    public static Dafny.TypeDescriptor<BigInteger> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static bool _Is(BigInteger __source) {
-      BigInteger _190_i = __source;
-      if (_System.nat._Is(_190_i)) {
-        return ((_190_i).Sign != -1) && ((_190_i) < (Std.Strings.DecimalConversion.__default.BASE()));
-      }
-      return false;
-    }
-  }
-} // end of namespace Std.Strings.DecimalConversion
-namespace Std.Strings.CharStrEscaping {
-
-  public partial class __default {
-    public static Dafny.ISequence<Dafny.Rune> Escape(Dafny.ISequence<Dafny.Rune> str, Dafny.ISet<Dafny.Rune> mustEscape, Dafny.Rune escape) {
-      Dafny.ISequence<Dafny.Rune> _191___accumulator = Dafny.Sequence<Dafny.Rune>.FromElements();
-    TAIL_CALL_START:;
-      if ((str).Equals(Dafny.Sequence<Dafny.Rune>.FromElements())) {
-        return Dafny.Sequence<Dafny.Rune>.Concat(_191___accumulator, str);
-      } else if ((mustEscape).Contains((str).Select(BigInteger.Zero))) {
-        _191___accumulator = Dafny.Sequence<Dafny.Rune>.Concat(_191___accumulator, Dafny.Sequence<Dafny.Rune>.FromElements(escape, (str).Select(BigInteger.Zero)));
-        Dafny.ISequence<Dafny.Rune> _in56 = (str).Drop(BigInteger.One);
-        Dafny.ISet<Dafny.Rune> _in57 = mustEscape;
-        Dafny.Rune _in58 = escape;
-        str = _in56;
-        mustEscape = _in57;
-        escape = _in58;
-        goto TAIL_CALL_START;
-      } else {
-        _191___accumulator = Dafny.Sequence<Dafny.Rune>.Concat(_191___accumulator, Dafny.Sequence<Dafny.Rune>.FromElements((str).Select(BigInteger.Zero)));
-        Dafny.ISequence<Dafny.Rune> _in59 = (str).Drop(BigInteger.One);
-        Dafny.ISet<Dafny.Rune> _in60 = mustEscape;
-        Dafny.Rune _in61 = escape;
-        str = _in59;
-        mustEscape = _in60;
-        escape = _in61;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> Unescape(Dafny.ISequence<Dafny.Rune> str, Dafny.Rune escape) {
-      if ((str).Equals(Dafny.Sequence<Dafny.Rune>.FromElements())) {
-        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_Some(str);
-      } else if (((str).Select(BigInteger.Zero)) == (escape)) {
-        if ((new BigInteger((str).Count)) > (BigInteger.One)) {
-          Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _192_valueOrError0 = Std.Strings.CharStrEscaping.__default.Unescape((str).Drop(new BigInteger(2)), escape);
-          if ((_192_valueOrError0).IsFailure()) {
-            return (_192_valueOrError0).PropagateFailure<Dafny.ISequence<Dafny.Rune>>();
-          } else {
-            Dafny.ISequence<Dafny.Rune> _193_tl = (_192_valueOrError0).Extract();
-            return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_Some(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.FromElements((str).Select(BigInteger.One)), _193_tl));
-          }
-        } else {
-          return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
-        }
-      } else {
-        Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _194_valueOrError1 = Std.Strings.CharStrEscaping.__default.Unescape((str).Drop(BigInteger.One), escape);
-        if ((_194_valueOrError1).IsFailure()) {
-          return (_194_valueOrError1).PropagateFailure<Dafny.ISequence<Dafny.Rune>>();
-        } else {
-          Dafny.ISequence<Dafny.Rune> _195_tl = (_194_valueOrError1).Extract();
-          return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_Some(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.FromElements((str).Select(BigInteger.Zero)), _195_tl));
-        }
-      }
-    }
-  }
-} // end of namespace Std.Strings.CharStrEscaping
-namespace Std.Strings {
-
-  public partial class __default {
-    public static Dafny.ISequence<Dafny.Rune> OfNat(BigInteger n) {
-      return Std.Strings.DecimalConversion.__default.OfNat(n);
-    }
-    public static Dafny.ISequence<Dafny.Rune> OfInt(BigInteger n) {
-      return Std.Strings.DecimalConversion.__default.OfInt(n, new Dafny.Rune('-'));
-    }
-    public static BigInteger ToNat(Dafny.ISequence<Dafny.Rune> str) {
-      return Std.Strings.DecimalConversion.__default.ToNat(str);
-    }
-    public static BigInteger ToInt(Dafny.ISequence<Dafny.Rune> str) {
-      return Std.Strings.DecimalConversion.__default.ToInt(str, new Dafny.Rune('-'));
-    }
-    public static Dafny.ISequence<Dafny.Rune> EscapeQuotes(Dafny.ISequence<Dafny.Rune> str) {
-      return Std.Strings.CharStrEscaping.__default.Escape(str, Dafny.Set<Dafny.Rune>.FromElements(new Dafny.Rune('\"'), new Dafny.Rune('\'')), new Dafny.Rune('\\'));
-    }
-    public static Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> UnescapeQuotes(Dafny.ISequence<Dafny.Rune> str) {
-      return Std.Strings.CharStrEscaping.__default.Unescape(str, new Dafny.Rune('\\'));
-    }
-    public static Dafny.ISequence<Dafny.Rune> OfBool(bool b) {
-      if (b) {
-        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("true");
-      } else {
-        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("false");
-      }
-    }
-    public static Dafny.ISequence<Dafny.Rune> OfChar(Dafny.Rune c) {
-      return Dafny.Sequence<Dafny.Rune>.FromElements(c);
-    }
-  }
-} // end of namespace Std.Strings
-
-namespace DAST {
-
-
-  public interface _IModule {
-    bool is_Module { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
-    bool dtor_isExtern { get; }
-    Dafny.ISequence<DAST._IModuleItem> dtor_body { get; }
-    _IModule DowncastClone();
-  }
-  public class Module : _IModule {
-    public readonly Dafny.ISequence<Dafny.Rune> _name;
-    public readonly bool _isExtern;
-    public readonly Dafny.ISequence<DAST._IModuleItem> _body;
-    public Module(Dafny.ISequence<Dafny.Rune> name, bool isExtern, Dafny.ISequence<DAST._IModuleItem> body) {
-      this._name = name;
-      this._isExtern = isExtern;
-      this._body = body;
-    }
-    public _IModule DowncastClone() {
-      if (this is _IModule dt) { return dt; }
-      return new Module(_name, _isExtern, _body);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Module;
-      return oth != null && object.Equals(this._name, oth._name) && this._isExtern == oth._isExtern && object.Equals(this._body, oth._body);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._isExtern));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Module.Module";
-      s += "(";
-      s += this._name.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._isExtern);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._body);
-      s += ")";
-      return s;
-    }
-    private static readonly DAST._IModule theDefault = create(Dafny.Sequence<Dafny.Rune>.Empty, false, Dafny.Sequence<DAST._IModuleItem>.Empty);
-    public static DAST._IModule Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<DAST._IModule> _TYPE = new Dafny.TypeDescriptor<DAST._IModule>(DAST.Module.Default());
-    public static Dafny.TypeDescriptor<DAST._IModule> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IModule create(Dafny.ISequence<Dafny.Rune> name, bool isExtern, Dafny.ISequence<DAST._IModuleItem> body) {
-      return new Module(name, isExtern, body);
-    }
-    public static _IModule create_Module(Dafny.ISequence<Dafny.Rune> name, bool isExtern, Dafny.ISequence<DAST._IModuleItem> body) {
-      return create(name, isExtern, body);
-    }
-    public bool is_Module { get { return true; } }
-    public Dafny.ISequence<Dafny.Rune> dtor_name {
-      get {
-        return this._name;
-      }
-    }
-    public bool dtor_isExtern {
-      get {
-        return this._isExtern;
-      }
-    }
-    public Dafny.ISequence<DAST._IModuleItem> dtor_body {
-      get {
-        return this._body;
-      }
-    }
-  }
-
-  public interface _IModuleItem {
-    bool is_Module { get; }
-    bool is_Class { get; }
-    bool is_Trait { get; }
-    bool is_Newtype { get; }
-    bool is_Datatype { get; }
-    DAST._IModule dtor_Module_a0 { get; }
-    DAST._IClass dtor_Class_a0 { get; }
-    DAST._ITrait dtor_Trait_a0 { get; }
-    DAST._INewtype dtor_Newtype_a0 { get; }
-    DAST._IDatatype dtor_Datatype_a0 { get; }
-    _IModuleItem DowncastClone();
-  }
-  public abstract class ModuleItem : _IModuleItem {
-    public ModuleItem() {
-    }
-    private static readonly DAST._IModuleItem theDefault = create_Module(DAST.Module.Default());
-    public static DAST._IModuleItem Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<DAST._IModuleItem> _TYPE = new Dafny.TypeDescriptor<DAST._IModuleItem>(DAST.ModuleItem.Default());
-    public static Dafny.TypeDescriptor<DAST._IModuleItem> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IModuleItem create_Module(DAST._IModule _a0) {
-      return new ModuleItem_Module(_a0);
-    }
-    public static _IModuleItem create_Class(DAST._IClass _a0) {
-      return new ModuleItem_Class(_a0);
-    }
-    public static _IModuleItem create_Trait(DAST._ITrait _a0) {
-      return new ModuleItem_Trait(_a0);
-    }
-    public static _IModuleItem create_Newtype(DAST._INewtype _a0) {
-      return new ModuleItem_Newtype(_a0);
-    }
-    public static _IModuleItem create_Datatype(DAST._IDatatype _a0) {
-      return new ModuleItem_Datatype(_a0);
-    }
-    public bool is_Module { get { return this is ModuleItem_Module; } }
-    public bool is_Class { get { return this is ModuleItem_Class; } }
-    public bool is_Trait { get { return this is ModuleItem_Trait; } }
-    public bool is_Newtype { get { return this is ModuleItem_Newtype; } }
-    public bool is_Datatype { get { return this is ModuleItem_Datatype; } }
-    public DAST._IModule dtor_Module_a0 {
-      get {
-        var d = this;
-        return ((ModuleItem_Module)d)._a0;
-      }
-    }
-    public DAST._IClass dtor_Class_a0 {
-      get {
-        var d = this;
-        return ((ModuleItem_Class)d)._a0;
-      }
-    }
-    public DAST._ITrait dtor_Trait_a0 {
-      get {
-        var d = this;
-        return ((ModuleItem_Trait)d)._a0;
-      }
-    }
-    public DAST._INewtype dtor_Newtype_a0 {
-      get {
-        var d = this;
-        return ((ModuleItem_Newtype)d)._a0;
-      }
-    }
-    public DAST._IDatatype dtor_Datatype_a0 {
-      get {
-        var d = this;
-        return ((ModuleItem_Datatype)d)._a0;
-      }
-    }
-    public abstract _IModuleItem DowncastClone();
-  }
-  public class ModuleItem_Module : ModuleItem {
-    public readonly DAST._IModule _a0;
-    public ModuleItem_Module(DAST._IModule _a0) : base() {
-      this._a0 = _a0;
-    }
-    public override _IModuleItem DowncastClone() {
-      if (this is _IModuleItem dt) { return dt; }
-      return new ModuleItem_Module(_a0);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.ModuleItem_Module;
-      return oth != null && object.Equals(this._a0, oth._a0);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.ModuleItem.Module";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._a0);
-      s += ")";
-      return s;
-    }
-  }
-  public class ModuleItem_Class : ModuleItem {
-    public readonly DAST._IClass _a0;
-    public ModuleItem_Class(DAST._IClass _a0) : base() {
-      this._a0 = _a0;
-    }
-    public override _IModuleItem DowncastClone() {
-      if (this is _IModuleItem dt) { return dt; }
-      return new ModuleItem_Class(_a0);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.ModuleItem_Class;
-      return oth != null && object.Equals(this._a0, oth._a0);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 1;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.ModuleItem.Class";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._a0);
-      s += ")";
-      return s;
-    }
-  }
-  public class ModuleItem_Trait : ModuleItem {
-    public readonly DAST._ITrait _a0;
-    public ModuleItem_Trait(DAST._ITrait _a0) : base() {
-      this._a0 = _a0;
-    }
-    public override _IModuleItem DowncastClone() {
-      if (this is _IModuleItem dt) { return dt; }
-      return new ModuleItem_Trait(_a0);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.ModuleItem_Trait;
-      return oth != null && object.Equals(this._a0, oth._a0);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 2;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.ModuleItem.Trait";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._a0);
-      s += ")";
-      return s;
-    }
-  }
-  public class ModuleItem_Newtype : ModuleItem {
-    public readonly DAST._INewtype _a0;
-    public ModuleItem_Newtype(DAST._INewtype _a0) : base() {
-      this._a0 = _a0;
-    }
-    public override _IModuleItem DowncastClone() {
-      if (this is _IModuleItem dt) { return dt; }
-      return new ModuleItem_Newtype(_a0);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.ModuleItem_Newtype;
-      return oth != null && object.Equals(this._a0, oth._a0);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 3;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.ModuleItem.Newtype";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._a0);
-      s += ")";
-      return s;
-    }
-  }
-  public class ModuleItem_Datatype : ModuleItem {
-    public readonly DAST._IDatatype _a0;
-    public ModuleItem_Datatype(DAST._IDatatype _a0) : base() {
-      this._a0 = _a0;
-    }
-    public override _IModuleItem DowncastClone() {
-      if (this is _IModuleItem dt) { return dt; }
-      return new ModuleItem_Datatype(_a0);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.ModuleItem_Datatype;
-      return oth != null && object.Equals(this._a0, oth._a0);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 4;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.ModuleItem.Datatype";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._a0);
-      s += ")";
-      return s;
-    }
-  }
-
-  public interface _IType {
-    bool is_Path { get; }
-    bool is_Nullable { get; }
-    bool is_Tuple { get; }
-    bool is_Array { get; }
-    bool is_Seq { get; }
-    bool is_Set { get; }
-    bool is_Multiset { get; }
-    bool is_Map { get; }
-    bool is_Arrow { get; }
-    bool is_Primitive { get; }
-    bool is_Passthrough { get; }
-    bool is_TypeArg { get; }
-    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_Path_a0 { get; }
-    Dafny.ISequence<DAST._IType> dtor_typeArgs { get; }
-    DAST._IResolvedType dtor_resolved { get; }
-    DAST._IType dtor_Nullable_a0 { get; }
-    Dafny.ISequence<DAST._IType> dtor_Tuple_a0 { get; }
-    DAST._IType dtor_element { get; }
-    BigInteger dtor_dims { get; }
-    DAST._IType dtor_key { get; }
-    DAST._IType dtor_value { get; }
-    Dafny.ISequence<DAST._IType> dtor_args { get; }
-    DAST._IType dtor_result { get; }
-    DAST._IPrimitive dtor_Primitive_a0 { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_Passthrough_a0 { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_TypeArg_a0 { get; }
-    _IType DowncastClone();
-  }
-  public abstract class Type : _IType {
-    public Type() {
-    }
-    private static readonly DAST._IType theDefault = create_Path(Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Empty, Dafny.Sequence<DAST._IType>.Empty, DAST.ResolvedType.Default());
-    public static DAST._IType Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<DAST._IType> _TYPE = new Dafny.TypeDescriptor<DAST._IType>(DAST.Type.Default());
-    public static Dafny.TypeDescriptor<DAST._IType> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IType create_Path(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _a0, Dafny.ISequence<DAST._IType> typeArgs, DAST._IResolvedType resolved) {
-      return new Type_Path(_a0, typeArgs, resolved);
-    }
-    public static _IType create_Nullable(DAST._IType _a0) {
-      return new Type_Nullable(_a0);
-    }
-    public static _IType create_Tuple(Dafny.ISequence<DAST._IType> _a0) {
-      return new Type_Tuple(_a0);
-    }
-    public static _IType create_Array(DAST._IType element, BigInteger dims) {
-      return new Type_Array(element, dims);
-    }
-    public static _IType create_Seq(DAST._IType element) {
-      return new Type_Seq(element);
-    }
-    public static _IType create_Set(DAST._IType element) {
-      return new Type_Set(element);
-    }
-    public static _IType create_Multiset(DAST._IType element) {
-      return new Type_Multiset(element);
-    }
-    public static _IType create_Map(DAST._IType key, DAST._IType @value) {
-      return new Type_Map(key, @value);
-    }
-    public static _IType create_Arrow(Dafny.ISequence<DAST._IType> args, DAST._IType result) {
-      return new Type_Arrow(args, result);
-    }
-    public static _IType create_Primitive(DAST._IPrimitive _a0) {
-      return new Type_Primitive(_a0);
-    }
-    public static _IType create_Passthrough(Dafny.ISequence<Dafny.Rune> _a0) {
-      return new Type_Passthrough(_a0);
-    }
-    public static _IType create_TypeArg(Dafny.ISequence<Dafny.Rune> _a0) {
-      return new Type_TypeArg(_a0);
-    }
-    public bool is_Path { get { return this is Type_Path; } }
-    public bool is_Nullable { get { return this is Type_Nullable; } }
-    public bool is_Tuple { get { return this is Type_Tuple; } }
-    public bool is_Array { get { return this is Type_Array; } }
-    public bool is_Seq { get { return this is Type_Seq; } }
-    public bool is_Set { get { return this is Type_Set; } }
-    public bool is_Multiset { get { return this is Type_Multiset; } }
-    public bool is_Map { get { return this is Type_Map; } }
-    public bool is_Arrow { get { return this is Type_Arrow; } }
-    public bool is_Primitive { get { return this is Type_Primitive; } }
-    public bool is_Passthrough { get { return this is Type_Passthrough; } }
-    public bool is_TypeArg { get { return this is Type_TypeArg; } }
-    public Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_Path_a0 {
-      get {
-        var d = this;
-        return ((Type_Path)d)._a0;
-      }
-    }
-    public Dafny.ISequence<DAST._IType> dtor_typeArgs {
-      get {
-        var d = this;
-        return ((Type_Path)d)._typeArgs;
-      }
-    }
-    public DAST._IResolvedType dtor_resolved {
-      get {
-        var d = this;
-        return ((Type_Path)d)._resolved;
-      }
-    }
-    public DAST._IType dtor_Nullable_a0 {
-      get {
-        var d = this;
-        return ((Type_Nullable)d)._a0;
-      }
-    }
-    public Dafny.ISequence<DAST._IType> dtor_Tuple_a0 {
-      get {
-        var d = this;
-        return ((Type_Tuple)d)._a0;
-      }
-    }
-    public DAST._IType dtor_element {
-      get {
-        var d = this;
-        if (d is Type_Array) { return ((Type_Array)d)._element; }
-        if (d is Type_Seq) { return ((Type_Seq)d)._element; }
-        if (d is Type_Set) { return ((Type_Set)d)._element; }
-        return ((Type_Multiset)d)._element;
-      }
-    }
-    public BigInteger dtor_dims {
-      get {
-        var d = this;
-        return ((Type_Array)d)._dims;
-      }
-    }
-    public DAST._IType dtor_key {
-      get {
-        var d = this;
-        return ((Type_Map)d)._key;
-      }
-    }
-    public DAST._IType dtor_value {
-      get {
-        var d = this;
-        return ((Type_Map)d)._value;
-      }
-    }
-    public Dafny.ISequence<DAST._IType> dtor_args {
-      get {
-        var d = this;
-        return ((Type_Arrow)d)._args;
-      }
-    }
-    public DAST._IType dtor_result {
-      get {
-        var d = this;
-        return ((Type_Arrow)d)._result;
-      }
-    }
-    public DAST._IPrimitive dtor_Primitive_a0 {
-      get {
-        var d = this;
-        return ((Type_Primitive)d)._a0;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> dtor_Passthrough_a0 {
-      get {
-        var d = this;
-        return ((Type_Passthrough)d)._a0;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> dtor_TypeArg_a0 {
-      get {
-        var d = this;
-        return ((Type_TypeArg)d)._a0;
-      }
-    }
-    public abstract _IType DowncastClone();
-  }
-  public class Type_Path : Type {
-    public readonly Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _a0;
-    public readonly Dafny.ISequence<DAST._IType> _typeArgs;
-    public readonly DAST._IResolvedType _resolved;
-    public Type_Path(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _a0, Dafny.ISequence<DAST._IType> typeArgs, DAST._IResolvedType resolved) : base() {
-      this._a0 = _a0;
-      this._typeArgs = typeArgs;
-      this._resolved = resolved;
-    }
-    public override _IType DowncastClone() {
-      if (this is _IType dt) { return dt; }
-      return new Type_Path(_a0, _typeArgs, _resolved);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Type_Path;
-      return oth != null && object.Equals(this._a0, oth._a0) && object.Equals(this._typeArgs, oth._typeArgs) && object.Equals(this._resolved, oth._resolved);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeArgs));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._resolved));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Type.Path";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._a0);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._typeArgs);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._resolved);
-      s += ")";
-      return s;
-    }
-  }
-  public class Type_Nullable : Type {
-    public readonly DAST._IType _a0;
-    public Type_Nullable(DAST._IType _a0) : base() {
-      this._a0 = _a0;
-    }
-    public override _IType DowncastClone() {
-      if (this is _IType dt) { return dt; }
-      return new Type_Nullable(_a0);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Type_Nullable;
-      return oth != null && object.Equals(this._a0, oth._a0);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 1;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Type.Nullable";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._a0);
-      s += ")";
-      return s;
-    }
-  }
-  public class Type_Tuple : Type {
-    public readonly Dafny.ISequence<DAST._IType> _a0;
-    public Type_Tuple(Dafny.ISequence<DAST._IType> _a0) : base() {
-      this._a0 = _a0;
-    }
-    public override _IType DowncastClone() {
-      if (this is _IType dt) { return dt; }
-      return new Type_Tuple(_a0);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Type_Tuple;
-      return oth != null && object.Equals(this._a0, oth._a0);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 2;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Type.Tuple";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._a0);
-      s += ")";
-      return s;
-    }
-  }
-  public class Type_Array : Type {
-    public readonly DAST._IType _element;
-    public readonly BigInteger _dims;
-    public Type_Array(DAST._IType element, BigInteger dims) : base() {
-      this._element = element;
-      this._dims = dims;
-    }
-    public override _IType DowncastClone() {
-      if (this is _IType dt) { return dt; }
-      return new Type_Array(_element, _dims);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Type_Array;
-      return oth != null && object.Equals(this._element, oth._element) && this._dims == oth._dims;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 3;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._element));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._dims));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Type.Array";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._element);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._dims);
-      s += ")";
-      return s;
-    }
-  }
-  public class Type_Seq : Type {
-    public readonly DAST._IType _element;
-    public Type_Seq(DAST._IType element) : base() {
-      this._element = element;
-    }
-    public override _IType DowncastClone() {
-      if (this is _IType dt) { return dt; }
-      return new Type_Seq(_element);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Type_Seq;
-      return oth != null && object.Equals(this._element, oth._element);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 4;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._element));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Type.Seq";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._element);
-      s += ")";
-      return s;
-    }
-  }
-  public class Type_Set : Type {
-    public readonly DAST._IType _element;
-    public Type_Set(DAST._IType element) : base() {
-      this._element = element;
-    }
-    public override _IType DowncastClone() {
-      if (this is _IType dt) { return dt; }
-      return new Type_Set(_element);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Type_Set;
-      return oth != null && object.Equals(this._element, oth._element);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 5;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._element));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Type.Set";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._element);
-      s += ")";
-      return s;
-    }
-  }
-  public class Type_Multiset : Type {
-    public readonly DAST._IType _element;
-    public Type_Multiset(DAST._IType element) : base() {
-      this._element = element;
-    }
-    public override _IType DowncastClone() {
-      if (this is _IType dt) { return dt; }
-      return new Type_Multiset(_element);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Type_Multiset;
-      return oth != null && object.Equals(this._element, oth._element);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 6;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._element));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Type.Multiset";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._element);
-      s += ")";
-      return s;
-    }
-  }
-  public class Type_Map : Type {
-    public readonly DAST._IType _key;
-    public readonly DAST._IType _value;
-    public Type_Map(DAST._IType key, DAST._IType @value) : base() {
-      this._key = key;
-      this._value = @value;
-    }
-    public override _IType DowncastClone() {
-      if (this is _IType dt) { return dt; }
-      return new Type_Map(_key, _value);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Type_Map;
-      return oth != null && object.Equals(this._key, oth._key) && object.Equals(this._value, oth._value);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 7;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._key));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._value));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Type.Map";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._key);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._value);
-      s += ")";
-      return s;
-    }
-  }
-  public class Type_Arrow : Type {
-    public readonly Dafny.ISequence<DAST._IType> _args;
-    public readonly DAST._IType _result;
-    public Type_Arrow(Dafny.ISequence<DAST._IType> args, DAST._IType result) : base() {
-      this._args = args;
-      this._result = result;
-    }
-    public override _IType DowncastClone() {
-      if (this is _IType dt) { return dt; }
-      return new Type_Arrow(_args, _result);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Type_Arrow;
-      return oth != null && object.Equals(this._args, oth._args) && object.Equals(this._result, oth._result);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 8;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._args));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._result));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Type.Arrow";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._args);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._result);
-      s += ")";
-      return s;
-    }
-  }
-  public class Type_Primitive : Type {
-    public readonly DAST._IPrimitive _a0;
-    public Type_Primitive(DAST._IPrimitive _a0) : base() {
-      this._a0 = _a0;
-    }
-    public override _IType DowncastClone() {
-      if (this is _IType dt) { return dt; }
-      return new Type_Primitive(_a0);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Type_Primitive;
-      return oth != null && object.Equals(this._a0, oth._a0);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 9;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Type.Primitive";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._a0);
-      s += ")";
-      return s;
-    }
-  }
-  public class Type_Passthrough : Type {
-    public readonly Dafny.ISequence<Dafny.Rune> _a0;
-    public Type_Passthrough(Dafny.ISequence<Dafny.Rune> _a0) : base() {
-      this._a0 = _a0;
-    }
-    public override _IType DowncastClone() {
-      if (this is _IType dt) { return dt; }
-      return new Type_Passthrough(_a0);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Type_Passthrough;
-      return oth != null && object.Equals(this._a0, oth._a0);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 10;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Type.Passthrough";
-      s += "(";
-      s += this._a0.ToVerbatimString(true);
-      s += ")";
-      return s;
-    }
-  }
-  public class Type_TypeArg : Type {
-    public readonly Dafny.ISequence<Dafny.Rune> _a0;
-    public Type_TypeArg(Dafny.ISequence<Dafny.Rune> _a0) : base() {
-      this._a0 = _a0;
-    }
-    public override _IType DowncastClone() {
-      if (this is _IType dt) { return dt; }
-      return new Type_TypeArg(_a0);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Type_TypeArg;
-      return oth != null && object.Equals(this._a0, oth._a0);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 11;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Type.TypeArg";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._a0);
-      s += ")";
-      return s;
-    }
-  }
-
-  public interface _IPrimitive {
-    bool is_Int { get; }
-    bool is_Real { get; }
-    bool is_String { get; }
-    bool is_Bool { get; }
-    bool is_Char { get; }
-    _IPrimitive DowncastClone();
-  }
-  public abstract class Primitive : _IPrimitive {
-    public Primitive() {
-    }
-    private static readonly DAST._IPrimitive theDefault = create_Int();
-    public static DAST._IPrimitive Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<DAST._IPrimitive> _TYPE = new Dafny.TypeDescriptor<DAST._IPrimitive>(DAST.Primitive.Default());
-    public static Dafny.TypeDescriptor<DAST._IPrimitive> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IPrimitive create_Int() {
-      return new Primitive_Int();
-    }
-    public static _IPrimitive create_Real() {
-      return new Primitive_Real();
-    }
-    public static _IPrimitive create_String() {
-      return new Primitive_String();
-    }
-    public static _IPrimitive create_Bool() {
-      return new Primitive_Bool();
-    }
-    public static _IPrimitive create_Char() {
-      return new Primitive_Char();
-    }
-    public bool is_Int { get { return this is Primitive_Int; } }
-    public bool is_Real { get { return this is Primitive_Real; } }
-    public bool is_String { get { return this is Primitive_String; } }
-    public bool is_Bool { get { return this is Primitive_Bool; } }
-    public bool is_Char { get { return this is Primitive_Char; } }
-    public static System.Collections.Generic.IEnumerable<_IPrimitive> AllSingletonConstructors {
-      get {
-        yield return Primitive.create_Int();
-        yield return Primitive.create_Real();
-        yield return Primitive.create_String();
-        yield return Primitive.create_Bool();
-        yield return Primitive.create_Char();
-      }
-    }
-    public abstract _IPrimitive DowncastClone();
-  }
-  public class Primitive_Int : Primitive {
-    public Primitive_Int() : base() {
-    }
-    public override _IPrimitive DowncastClone() {
-      if (this is _IPrimitive dt) { return dt; }
-      return new Primitive_Int();
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Primitive_Int;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Primitive.Int";
-      return s;
-    }
-  }
-  public class Primitive_Real : Primitive {
-    public Primitive_Real() : base() {
-    }
-    public override _IPrimitive DowncastClone() {
-      if (this is _IPrimitive dt) { return dt; }
-      return new Primitive_Real();
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Primitive_Real;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 1;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Primitive.Real";
-      return s;
-    }
-  }
-  public class Primitive_String : Primitive {
-    public Primitive_String() : base() {
-    }
-    public override _IPrimitive DowncastClone() {
-      if (this is _IPrimitive dt) { return dt; }
-      return new Primitive_String();
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Primitive_String;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 2;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Primitive.String";
-      return s;
-    }
-  }
-  public class Primitive_Bool : Primitive {
-    public Primitive_Bool() : base() {
-    }
-    public override _IPrimitive DowncastClone() {
-      if (this is _IPrimitive dt) { return dt; }
-      return new Primitive_Bool();
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Primitive_Bool;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 3;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Primitive.Bool";
-      return s;
-    }
-  }
-  public class Primitive_Char : Primitive {
-    public Primitive_Char() : base() {
-    }
-    public override _IPrimitive DowncastClone() {
-      if (this is _IPrimitive dt) { return dt; }
-      return new Primitive_Char();
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Primitive_Char;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 4;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Primitive.Char";
-      return s;
-    }
-  }
-
-  public interface _IResolvedType {
-    bool is_Datatype { get; }
-    bool is_Trait { get; }
-    bool is_Newtype { get; }
-    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_path { get; }
-    DAST._IType dtor_Newtype_a0 { get; }
-    _IResolvedType DowncastClone();
-  }
-  public abstract class ResolvedType : _IResolvedType {
-    public ResolvedType() {
-    }
-    private static readonly DAST._IResolvedType theDefault = create_Datatype(Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Empty);
-    public static DAST._IResolvedType Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<DAST._IResolvedType> _TYPE = new Dafny.TypeDescriptor<DAST._IResolvedType>(DAST.ResolvedType.Default());
-    public static Dafny.TypeDescriptor<DAST._IResolvedType> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IResolvedType create_Datatype(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> path) {
-      return new ResolvedType_Datatype(path);
-    }
-    public static _IResolvedType create_Trait(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> path) {
-      return new ResolvedType_Trait(path);
-    }
-    public static _IResolvedType create_Newtype(DAST._IType _a0) {
-      return new ResolvedType_Newtype(_a0);
-    }
-    public bool is_Datatype { get { return this is ResolvedType_Datatype; } }
-    public bool is_Trait { get { return this is ResolvedType_Trait; } }
-    public bool is_Newtype { get { return this is ResolvedType_Newtype; } }
-    public Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_path {
-      get {
-        var d = this;
-        if (d is ResolvedType_Datatype) { return ((ResolvedType_Datatype)d)._path; }
-        return ((ResolvedType_Trait)d)._path;
-      }
-    }
-    public DAST._IType dtor_Newtype_a0 {
-      get {
-        var d = this;
-        return ((ResolvedType_Newtype)d)._a0;
-      }
-    }
-    public abstract _IResolvedType DowncastClone();
-  }
-  public class ResolvedType_Datatype : ResolvedType {
-    public readonly Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _path;
-    public ResolvedType_Datatype(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> path) : base() {
-      this._path = path;
-    }
-    public override _IResolvedType DowncastClone() {
-      if (this is _IResolvedType dt) { return dt; }
-      return new ResolvedType_Datatype(_path);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.ResolvedType_Datatype;
-      return oth != null && object.Equals(this._path, oth._path);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._path));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.ResolvedType.Datatype";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._path);
-      s += ")";
-      return s;
-    }
-  }
-  public class ResolvedType_Trait : ResolvedType {
-    public readonly Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _path;
-    public ResolvedType_Trait(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> path) : base() {
-      this._path = path;
-    }
-    public override _IResolvedType DowncastClone() {
-      if (this is _IResolvedType dt) { return dt; }
-      return new ResolvedType_Trait(_path);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.ResolvedType_Trait;
-      return oth != null && object.Equals(this._path, oth._path);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 1;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._path));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.ResolvedType.Trait";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._path);
-      s += ")";
-      return s;
-    }
-  }
-  public class ResolvedType_Newtype : ResolvedType {
-    public readonly DAST._IType _a0;
-    public ResolvedType_Newtype(DAST._IType _a0) : base() {
-      this._a0 = _a0;
-    }
-    public override _IResolvedType DowncastClone() {
-      if (this is _IResolvedType dt) { return dt; }
-      return new ResolvedType_Newtype(_a0);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.ResolvedType_Newtype;
-      return oth != null && object.Equals(this._a0, oth._a0);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 2;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.ResolvedType.Newtype";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._a0);
-      s += ")";
-      return s;
-    }
-  }
-
-  public interface _IIdent {
-    bool is_Ident { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_id { get; }
-  }
-  public class Ident : _IIdent {
-    public readonly Dafny.ISequence<Dafny.Rune> _id;
-    public Ident(Dafny.ISequence<Dafny.Rune> id) {
-      this._id = id;
-    }
-    public static Dafny.ISequence<Dafny.Rune> DowncastClone(Dafny.ISequence<Dafny.Rune> _this) {
-      return _this;
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Ident;
-      return oth != null && object.Equals(this._id, oth._id);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._id));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Ident.Ident";
-      s += "(";
-      s += this._id.ToVerbatimString(true);
-      s += ")";
-      return s;
-    }
-    private static readonly Dafny.ISequence<Dafny.Rune> theDefault = Dafny.Sequence<Dafny.Rune>.Empty;
-    public static Dafny.ISequence<Dafny.Rune> Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>> _TYPE = new Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>>(Dafny.Sequence<Dafny.Rune>.Empty);
-    public static Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IIdent create(Dafny.ISequence<Dafny.Rune> id) {
-      return new Ident(id);
-    }
-    public static _IIdent create_Ident(Dafny.ISequence<Dafny.Rune> id) {
-      return create(id);
-    }
-    public bool is_Ident { get { return true; } }
-    public Dafny.ISequence<Dafny.Rune> dtor_id {
-      get {
-        return this._id;
-      }
-    }
-  }
-
-  public interface _IClass {
-    bool is_Class { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_enclosingModule { get; }
-    Dafny.ISequence<DAST._IType> dtor_typeParams { get; }
-    Dafny.ISequence<DAST._IType> dtor_superClasses { get; }
-    Dafny.ISequence<DAST._IField> dtor_fields { get; }
-    Dafny.ISequence<DAST._IMethod> dtor_body { get; }
-    _IClass DowncastClone();
-  }
-  public class Class : _IClass {
-    public readonly Dafny.ISequence<Dafny.Rune> _name;
-    public readonly Dafny.ISequence<Dafny.Rune> _enclosingModule;
-    public readonly Dafny.ISequence<DAST._IType> _typeParams;
-    public readonly Dafny.ISequence<DAST._IType> _superClasses;
-    public readonly Dafny.ISequence<DAST._IField> _fields;
-    public readonly Dafny.ISequence<DAST._IMethod> _body;
-    public Class(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<Dafny.Rune> enclosingModule, Dafny.ISequence<DAST._IType> typeParams, Dafny.ISequence<DAST._IType> superClasses, Dafny.ISequence<DAST._IField> fields, Dafny.ISequence<DAST._IMethod> body) {
-      this._name = name;
-      this._enclosingModule = enclosingModule;
-      this._typeParams = typeParams;
-      this._superClasses = superClasses;
-      this._fields = fields;
-      this._body = body;
-    }
-    public _IClass DowncastClone() {
-      if (this is _IClass dt) { return dt; }
-      return new Class(_name, _enclosingModule, _typeParams, _superClasses, _fields, _body);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Class;
-      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._enclosingModule, oth._enclosingModule) && object.Equals(this._typeParams, oth._typeParams) && object.Equals(this._superClasses, oth._superClasses) && object.Equals(this._fields, oth._fields) && object.Equals(this._body, oth._body);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._enclosingModule));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeParams));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._superClasses));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._fields));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Class.Class";
-      s += "(";
-      s += this._name.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._enclosingModule);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._typeParams);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._superClasses);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._fields);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._body);
-      s += ")";
-      return s;
-    }
-    private static readonly DAST._IClass theDefault = create(Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<DAST._IType>.Empty, Dafny.Sequence<DAST._IType>.Empty, Dafny.Sequence<DAST._IField>.Empty, Dafny.Sequence<DAST._IMethod>.Empty);
-    public static DAST._IClass Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<DAST._IClass> _TYPE = new Dafny.TypeDescriptor<DAST._IClass>(DAST.Class.Default());
-    public static Dafny.TypeDescriptor<DAST._IClass> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IClass create(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<Dafny.Rune> enclosingModule, Dafny.ISequence<DAST._IType> typeParams, Dafny.ISequence<DAST._IType> superClasses, Dafny.ISequence<DAST._IField> fields, Dafny.ISequence<DAST._IMethod> body) {
-      return new Class(name, enclosingModule, typeParams, superClasses, fields, body);
-    }
-    public static _IClass create_Class(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<Dafny.Rune> enclosingModule, Dafny.ISequence<DAST._IType> typeParams, Dafny.ISequence<DAST._IType> superClasses, Dafny.ISequence<DAST._IField> fields, Dafny.ISequence<DAST._IMethod> body) {
-      return create(name, enclosingModule, typeParams, superClasses, fields, body);
-    }
-    public bool is_Class { get { return true; } }
-    public Dafny.ISequence<Dafny.Rune> dtor_name {
-      get {
-        return this._name;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> dtor_enclosingModule {
-      get {
-        return this._enclosingModule;
-      }
-    }
-    public Dafny.ISequence<DAST._IType> dtor_typeParams {
-      get {
-        return this._typeParams;
-      }
-    }
-    public Dafny.ISequence<DAST._IType> dtor_superClasses {
-      get {
-        return this._superClasses;
-      }
-    }
-    public Dafny.ISequence<DAST._IField> dtor_fields {
-      get {
-        return this._fields;
-      }
-    }
-    public Dafny.ISequence<DAST._IMethod> dtor_body {
-      get {
-        return this._body;
-      }
-    }
-  }
-
-  public interface _ITrait {
-    bool is_Trait { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
-    Dafny.ISequence<DAST._IType> dtor_typeParams { get; }
-    Dafny.ISequence<DAST._IMethod> dtor_body { get; }
-    _ITrait DowncastClone();
-  }
-  public class Trait : _ITrait {
-    public readonly Dafny.ISequence<Dafny.Rune> _name;
-    public readonly Dafny.ISequence<DAST._IType> _typeParams;
-    public readonly Dafny.ISequence<DAST._IMethod> _body;
-    public Trait(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IType> typeParams, Dafny.ISequence<DAST._IMethod> body) {
-      this._name = name;
-      this._typeParams = typeParams;
-      this._body = body;
-    }
-    public _ITrait DowncastClone() {
-      if (this is _ITrait dt) { return dt; }
-      return new Trait(_name, _typeParams, _body);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Trait;
-      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._typeParams, oth._typeParams) && object.Equals(this._body, oth._body);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeParams));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Trait.Trait";
-      s += "(";
-      s += this._name.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._typeParams);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._body);
-      s += ")";
-      return s;
-    }
-    private static readonly DAST._ITrait theDefault = create(Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<DAST._IType>.Empty, Dafny.Sequence<DAST._IMethod>.Empty);
-    public static DAST._ITrait Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<DAST._ITrait> _TYPE = new Dafny.TypeDescriptor<DAST._ITrait>(DAST.Trait.Default());
-    public static Dafny.TypeDescriptor<DAST._ITrait> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _ITrait create(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IType> typeParams, Dafny.ISequence<DAST._IMethod> body) {
-      return new Trait(name, typeParams, body);
-    }
-    public static _ITrait create_Trait(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IType> typeParams, Dafny.ISequence<DAST._IMethod> body) {
-      return create(name, typeParams, body);
-    }
-    public bool is_Trait { get { return true; } }
-    public Dafny.ISequence<Dafny.Rune> dtor_name {
-      get {
-        return this._name;
-      }
-    }
-    public Dafny.ISequence<DAST._IType> dtor_typeParams {
-      get {
-        return this._typeParams;
-      }
-    }
-    public Dafny.ISequence<DAST._IMethod> dtor_body {
-      get {
-        return this._body;
-      }
-    }
-  }
-
-  public interface _IDatatype {
-    bool is_Datatype { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_enclosingModule { get; }
-    Dafny.ISequence<DAST._IType> dtor_typeParams { get; }
-    Dafny.ISequence<DAST._IDatatypeCtor> dtor_ctors { get; }
-    Dafny.ISequence<DAST._IMethod> dtor_body { get; }
-    bool dtor_isCo { get; }
-    _IDatatype DowncastClone();
-  }
-  public class Datatype : _IDatatype {
-    public readonly Dafny.ISequence<Dafny.Rune> _name;
-    public readonly Dafny.ISequence<Dafny.Rune> _enclosingModule;
-    public readonly Dafny.ISequence<DAST._IType> _typeParams;
-    public readonly Dafny.ISequence<DAST._IDatatypeCtor> _ctors;
-    public readonly Dafny.ISequence<DAST._IMethod> _body;
-    public readonly bool _isCo;
-    public Datatype(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<Dafny.Rune> enclosingModule, Dafny.ISequence<DAST._IType> typeParams, Dafny.ISequence<DAST._IDatatypeCtor> ctors, Dafny.ISequence<DAST._IMethod> body, bool isCo) {
-      this._name = name;
-      this._enclosingModule = enclosingModule;
-      this._typeParams = typeParams;
-      this._ctors = ctors;
-      this._body = body;
-      this._isCo = isCo;
-    }
-    public _IDatatype DowncastClone() {
-      if (this is _IDatatype dt) { return dt; }
-      return new Datatype(_name, _enclosingModule, _typeParams, _ctors, _body, _isCo);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Datatype;
-      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._enclosingModule, oth._enclosingModule) && object.Equals(this._typeParams, oth._typeParams) && object.Equals(this._ctors, oth._ctors) && object.Equals(this._body, oth._body) && this._isCo == oth._isCo;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._enclosingModule));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeParams));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._ctors));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._isCo));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Datatype.Datatype";
-      s += "(";
-      s += this._name.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._enclosingModule);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._typeParams);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._ctors);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._body);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._isCo);
-      s += ")";
-      return s;
-    }
-    private static readonly DAST._IDatatype theDefault = create(Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<DAST._IType>.Empty, Dafny.Sequence<DAST._IDatatypeCtor>.Empty, Dafny.Sequence<DAST._IMethod>.Empty, false);
-    public static DAST._IDatatype Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<DAST._IDatatype> _TYPE = new Dafny.TypeDescriptor<DAST._IDatatype>(DAST.Datatype.Default());
-    public static Dafny.TypeDescriptor<DAST._IDatatype> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IDatatype create(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<Dafny.Rune> enclosingModule, Dafny.ISequence<DAST._IType> typeParams, Dafny.ISequence<DAST._IDatatypeCtor> ctors, Dafny.ISequence<DAST._IMethod> body, bool isCo) {
-      return new Datatype(name, enclosingModule, typeParams, ctors, body, isCo);
-    }
-    public static _IDatatype create_Datatype(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<Dafny.Rune> enclosingModule, Dafny.ISequence<DAST._IType> typeParams, Dafny.ISequence<DAST._IDatatypeCtor> ctors, Dafny.ISequence<DAST._IMethod> body, bool isCo) {
-      return create(name, enclosingModule, typeParams, ctors, body, isCo);
-    }
-    public bool is_Datatype { get { return true; } }
-    public Dafny.ISequence<Dafny.Rune> dtor_name {
-      get {
-        return this._name;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> dtor_enclosingModule {
-      get {
-        return this._enclosingModule;
-      }
-    }
-    public Dafny.ISequence<DAST._IType> dtor_typeParams {
-      get {
-        return this._typeParams;
-      }
-    }
-    public Dafny.ISequence<DAST._IDatatypeCtor> dtor_ctors {
-      get {
-        return this._ctors;
-      }
-    }
-    public Dafny.ISequence<DAST._IMethod> dtor_body {
-      get {
-        return this._body;
-      }
-    }
-    public bool dtor_isCo {
-      get {
-        return this._isCo;
-      }
-    }
-  }
-
-  public interface _IDatatypeCtor {
-    bool is_DatatypeCtor { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
-    Dafny.ISequence<DAST._IFormal> dtor_args { get; }
-    bool dtor_hasAnyArgs { get; }
-    _IDatatypeCtor DowncastClone();
-  }
-  public class DatatypeCtor : _IDatatypeCtor {
-    public readonly Dafny.ISequence<Dafny.Rune> _name;
-    public readonly Dafny.ISequence<DAST._IFormal> _args;
-    public readonly bool _hasAnyArgs;
-    public DatatypeCtor(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IFormal> args, bool hasAnyArgs) {
-      this._name = name;
-      this._args = args;
-      this._hasAnyArgs = hasAnyArgs;
-    }
-    public _IDatatypeCtor DowncastClone() {
-      if (this is _IDatatypeCtor dt) { return dt; }
-      return new DatatypeCtor(_name, _args, _hasAnyArgs);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.DatatypeCtor;
-      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._args, oth._args) && this._hasAnyArgs == oth._hasAnyArgs;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._args));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._hasAnyArgs));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.DatatypeCtor.DatatypeCtor";
-      s += "(";
-      s += this._name.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._args);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._hasAnyArgs);
-      s += ")";
-      return s;
-    }
-    private static readonly DAST._IDatatypeCtor theDefault = create(Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<DAST._IFormal>.Empty, false);
-    public static DAST._IDatatypeCtor Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<DAST._IDatatypeCtor> _TYPE = new Dafny.TypeDescriptor<DAST._IDatatypeCtor>(DAST.DatatypeCtor.Default());
-    public static Dafny.TypeDescriptor<DAST._IDatatypeCtor> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IDatatypeCtor create(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IFormal> args, bool hasAnyArgs) {
-      return new DatatypeCtor(name, args, hasAnyArgs);
-    }
-    public static _IDatatypeCtor create_DatatypeCtor(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IFormal> args, bool hasAnyArgs) {
-      return create(name, args, hasAnyArgs);
-    }
-    public bool is_DatatypeCtor { get { return true; } }
-    public Dafny.ISequence<Dafny.Rune> dtor_name {
-      get {
-        return this._name;
-      }
-    }
-    public Dafny.ISequence<DAST._IFormal> dtor_args {
-      get {
-        return this._args;
-      }
-    }
-    public bool dtor_hasAnyArgs {
-      get {
-        return this._hasAnyArgs;
-      }
-    }
-  }
-
-  public interface _INewtype {
-    bool is_Newtype { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
-    Dafny.ISequence<DAST._IType> dtor_typeParams { get; }
-    DAST._IType dtor_base { get; }
-    Dafny.ISequence<DAST._IStatement> dtor_witnessStmts { get; }
-    Std.Wrappers._IOption<DAST._IExpression> dtor_witnessExpr { get; }
-    _INewtype DowncastClone();
-  }
-  public class Newtype : _INewtype {
-    public readonly Dafny.ISequence<Dafny.Rune> _name;
-    public readonly Dafny.ISequence<DAST._IType> _typeParams;
-    public readonly DAST._IType _base;
-    public readonly Dafny.ISequence<DAST._IStatement> _witnessStmts;
-    public readonly Std.Wrappers._IOption<DAST._IExpression> _witnessExpr;
-    public Newtype(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IType> typeParams, DAST._IType @base, Dafny.ISequence<DAST._IStatement> witnessStmts, Std.Wrappers._IOption<DAST._IExpression> witnessExpr) {
-      this._name = name;
-      this._typeParams = typeParams;
-      this._base = @base;
-      this._witnessStmts = witnessStmts;
-      this._witnessExpr = witnessExpr;
-    }
-    public _INewtype DowncastClone() {
-      if (this is _INewtype dt) { return dt; }
-      return new Newtype(_name, _typeParams, _base, _witnessStmts, _witnessExpr);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Newtype;
-      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._typeParams, oth._typeParams) && object.Equals(this._base, oth._base) && object.Equals(this._witnessStmts, oth._witnessStmts) && object.Equals(this._witnessExpr, oth._witnessExpr);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeParams));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._base));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._witnessStmts));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._witnessExpr));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Newtype.Newtype";
-      s += "(";
-      s += this._name.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._typeParams);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._base);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._witnessStmts);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._witnessExpr);
-      s += ")";
-      return s;
-    }
-    private static readonly DAST._INewtype theDefault = create(Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<DAST._IType>.Empty, DAST.Type.Default(), Dafny.Sequence<DAST._IStatement>.Empty, Std.Wrappers.Option<DAST._IExpression>.Default());
-    public static DAST._INewtype Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<DAST._INewtype> _TYPE = new Dafny.TypeDescriptor<DAST._INewtype>(DAST.Newtype.Default());
-    public static Dafny.TypeDescriptor<DAST._INewtype> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _INewtype create(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IType> typeParams, DAST._IType @base, Dafny.ISequence<DAST._IStatement> witnessStmts, Std.Wrappers._IOption<DAST._IExpression> witnessExpr) {
-      return new Newtype(name, typeParams, @base, witnessStmts, witnessExpr);
-    }
-    public static _INewtype create_Newtype(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IType> typeParams, DAST._IType @base, Dafny.ISequence<DAST._IStatement> witnessStmts, Std.Wrappers._IOption<DAST._IExpression> witnessExpr) {
-      return create(name, typeParams, @base, witnessStmts, witnessExpr);
-    }
-    public bool is_Newtype { get { return true; } }
-    public Dafny.ISequence<Dafny.Rune> dtor_name {
-      get {
-        return this._name;
-      }
-    }
-    public Dafny.ISequence<DAST._IType> dtor_typeParams {
-      get {
-        return this._typeParams;
-      }
-    }
-    public DAST._IType dtor_base {
-      get {
-        return this._base;
-      }
-    }
-    public Dafny.ISequence<DAST._IStatement> dtor_witnessStmts {
-      get {
-        return this._witnessStmts;
-      }
-    }
-    public Std.Wrappers._IOption<DAST._IExpression> dtor_witnessExpr {
-      get {
-        return this._witnessExpr;
-      }
-    }
-  }
-
-  public interface _IClassItem {
-    bool is_Method { get; }
-    DAST._IMethod dtor_Method_a0 { get; }
-  }
-  public class ClassItem : _IClassItem {
-    public readonly DAST._IMethod _a0;
-    public ClassItem(DAST._IMethod _a0) {
-      this._a0 = _a0;
-    }
-    public static DAST._IMethod DowncastClone(DAST._IMethod _this) {
-      return _this;
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.ClassItem;
-      return oth != null && object.Equals(this._a0, oth._a0);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.ClassItem.Method";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._a0);
-      s += ")";
-      return s;
-    }
-    private static readonly DAST._IMethod theDefault = DAST.Method.Default();
-    public static DAST._IMethod Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<DAST._IMethod> _TYPE = new Dafny.TypeDescriptor<DAST._IMethod>(DAST.Method.Default());
-    public static Dafny.TypeDescriptor<DAST._IMethod> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IClassItem create(DAST._IMethod _a0) {
-      return new ClassItem(_a0);
-    }
-    public static _IClassItem create_Method(DAST._IMethod _a0) {
-      return create(_a0);
-    }
-    public bool is_Method { get { return true; } }
-    public DAST._IMethod dtor_Method_a0 {
-      get {
-        return this._a0;
-      }
-    }
-  }
-
-  public interface _IField {
-    bool is_Field { get; }
-    DAST._IFormal dtor_formal { get; }
-    Std.Wrappers._IOption<DAST._IExpression> dtor_defaultValue { get; }
-    _IField DowncastClone();
-  }
-  public class Field : _IField {
-    public readonly DAST._IFormal _formal;
-    public readonly Std.Wrappers._IOption<DAST._IExpression> _defaultValue;
-    public Field(DAST._IFormal formal, Std.Wrappers._IOption<DAST._IExpression> defaultValue) {
-      this._formal = formal;
-      this._defaultValue = defaultValue;
-    }
-    public _IField DowncastClone() {
-      if (this is _IField dt) { return dt; }
-      return new Field(_formal, _defaultValue);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Field;
-      return oth != null && object.Equals(this._formal, oth._formal) && object.Equals(this._defaultValue, oth._defaultValue);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._formal));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._defaultValue));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Field.Field";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._formal);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._defaultValue);
-      s += ")";
-      return s;
-    }
-    private static readonly DAST._IField theDefault = create(DAST.Formal.Default(), Std.Wrappers.Option<DAST._IExpression>.Default());
-    public static DAST._IField Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<DAST._IField> _TYPE = new Dafny.TypeDescriptor<DAST._IField>(DAST.Field.Default());
-    public static Dafny.TypeDescriptor<DAST._IField> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IField create(DAST._IFormal formal, Std.Wrappers._IOption<DAST._IExpression> defaultValue) {
-      return new Field(formal, defaultValue);
-    }
-    public static _IField create_Field(DAST._IFormal formal, Std.Wrappers._IOption<DAST._IExpression> defaultValue) {
-      return create(formal, defaultValue);
-    }
-    public bool is_Field { get { return true; } }
-    public DAST._IFormal dtor_formal {
-      get {
-        return this._formal;
-      }
-    }
-    public Std.Wrappers._IOption<DAST._IExpression> dtor_defaultValue {
-      get {
-        return this._defaultValue;
-      }
-    }
-  }
-
-  public interface _IFormal {
-    bool is_Formal { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
-    DAST._IType dtor_typ { get; }
-    _IFormal DowncastClone();
-  }
-  public class Formal : _IFormal {
-    public readonly Dafny.ISequence<Dafny.Rune> _name;
-    public readonly DAST._IType _typ;
-    public Formal(Dafny.ISequence<Dafny.Rune> name, DAST._IType typ) {
-      this._name = name;
-      this._typ = typ;
-    }
-    public _IFormal DowncastClone() {
-      if (this is _IFormal dt) { return dt; }
-      return new Formal(_name, _typ);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Formal;
-      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._typ, oth._typ);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typ));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Formal.Formal";
-      s += "(";
-      s += this._name.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._typ);
-      s += ")";
-      return s;
-    }
-    private static readonly DAST._IFormal theDefault = create(Dafny.Sequence<Dafny.Rune>.Empty, DAST.Type.Default());
-    public static DAST._IFormal Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<DAST._IFormal> _TYPE = new Dafny.TypeDescriptor<DAST._IFormal>(DAST.Formal.Default());
-    public static Dafny.TypeDescriptor<DAST._IFormal> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IFormal create(Dafny.ISequence<Dafny.Rune> name, DAST._IType typ) {
-      return new Formal(name, typ);
-    }
-    public static _IFormal create_Formal(Dafny.ISequence<Dafny.Rune> name, DAST._IType typ) {
-      return create(name, typ);
-    }
-    public bool is_Formal { get { return true; } }
-    public Dafny.ISequence<Dafny.Rune> dtor_name {
-      get {
-        return this._name;
-      }
-    }
-    public DAST._IType dtor_typ {
-      get {
-        return this._typ;
-      }
-    }
-  }
-
-  public interface _IMethod {
-    bool is_Method { get; }
-    bool dtor_isStatic { get; }
-    bool dtor_hasBody { get; }
-    Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> dtor_overridingPath { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
-    Dafny.ISequence<DAST._IType> dtor_typeParams { get; }
-    Dafny.ISequence<DAST._IFormal> dtor_params { get; }
-    Dafny.ISequence<DAST._IStatement> dtor_body { get; }
-    Dafny.ISequence<DAST._IType> dtor_outTypes { get; }
-    Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> dtor_outVars { get; }
-    _IMethod DowncastClone();
-  }
-  public class Method : _IMethod {
-    public readonly bool _isStatic;
-    public readonly bool _hasBody;
-    public readonly Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> _overridingPath;
-    public readonly Dafny.ISequence<Dafny.Rune> _name;
-    public readonly Dafny.ISequence<DAST._IType> _typeParams;
-    public readonly Dafny.ISequence<DAST._IFormal> _params;
-    public readonly Dafny.ISequence<DAST._IStatement> _body;
-    public readonly Dafny.ISequence<DAST._IType> _outTypes;
-    public readonly Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> _outVars;
-    public Method(bool isStatic, bool hasBody, Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> overridingPath, Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IType> typeParams, Dafny.ISequence<DAST._IFormal> @params, Dafny.ISequence<DAST._IStatement> body, Dafny.ISequence<DAST._IType> outTypes, Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> outVars) {
-      this._isStatic = isStatic;
-      this._hasBody = hasBody;
-      this._overridingPath = overridingPath;
-      this._name = name;
-      this._typeParams = typeParams;
-      this._params = @params;
-      this._body = body;
-      this._outTypes = outTypes;
-      this._outVars = outVars;
-    }
-    public _IMethod DowncastClone() {
-      if (this is _IMethod dt) { return dt; }
-      return new Method(_isStatic, _hasBody, _overridingPath, _name, _typeParams, _params, _body, _outTypes, _outVars);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Method;
-      return oth != null && this._isStatic == oth._isStatic && this._hasBody == oth._hasBody && object.Equals(this._overridingPath, oth._overridingPath) && object.Equals(this._name, oth._name) && object.Equals(this._typeParams, oth._typeParams) && object.Equals(this._params, oth._params) && object.Equals(this._body, oth._body) && object.Equals(this._outTypes, oth._outTypes) && object.Equals(this._outVars, oth._outVars);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._isStatic));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._hasBody));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._overridingPath));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeParams));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._params));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._outTypes));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._outVars));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Method.Method";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._isStatic);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._hasBody);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._overridingPath);
-      s += ", ";
-      s += this._name.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._typeParams);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._params);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._body);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._outTypes);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._outVars);
-      s += ")";
-      return s;
-    }
-    private static readonly DAST._IMethod theDefault = create(false, false, Std.Wrappers.Option<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>>.Default(), Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<DAST._IType>.Empty, Dafny.Sequence<DAST._IFormal>.Empty, Dafny.Sequence<DAST._IStatement>.Empty, Dafny.Sequence<DAST._IType>.Empty, Std.Wrappers.Option<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>>.Default());
-    public static DAST._IMethod Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<DAST._IMethod> _TYPE = new Dafny.TypeDescriptor<DAST._IMethod>(DAST.Method.Default());
-    public static Dafny.TypeDescriptor<DAST._IMethod> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IMethod create(bool isStatic, bool hasBody, Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> overridingPath, Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IType> typeParams, Dafny.ISequence<DAST._IFormal> @params, Dafny.ISequence<DAST._IStatement> body, Dafny.ISequence<DAST._IType> outTypes, Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> outVars) {
-      return new Method(isStatic, hasBody, overridingPath, name, typeParams, @params, body, outTypes, outVars);
-    }
-    public static _IMethod create_Method(bool isStatic, bool hasBody, Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> overridingPath, Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IType> typeParams, Dafny.ISequence<DAST._IFormal> @params, Dafny.ISequence<DAST._IStatement> body, Dafny.ISequence<DAST._IType> outTypes, Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> outVars) {
-      return create(isStatic, hasBody, overridingPath, name, typeParams, @params, body, outTypes, outVars);
-    }
-    public bool is_Method { get { return true; } }
-    public bool dtor_isStatic {
-      get {
-        return this._isStatic;
-      }
-    }
-    public bool dtor_hasBody {
-      get {
-        return this._hasBody;
-      }
-    }
-    public Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> dtor_overridingPath {
-      get {
-        return this._overridingPath;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> dtor_name {
-      get {
-        return this._name;
-      }
-    }
-    public Dafny.ISequence<DAST._IType> dtor_typeParams {
-      get {
-        return this._typeParams;
-      }
-    }
-    public Dafny.ISequence<DAST._IFormal> dtor_params {
-      get {
-        return this._params;
-      }
-    }
-    public Dafny.ISequence<DAST._IStatement> dtor_body {
-      get {
-        return this._body;
-      }
-    }
-    public Dafny.ISequence<DAST._IType> dtor_outTypes {
-      get {
-        return this._outTypes;
-      }
-    }
-    public Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> dtor_outVars {
-      get {
-        return this._outVars;
-      }
-    }
-  }
-
-  public interface _IStatement {
-    bool is_DeclareVar { get; }
-    bool is_Assign { get; }
-    bool is_If { get; }
-    bool is_Labeled { get; }
-    bool is_While { get; }
-    bool is_Foreach { get; }
-    bool is_Call { get; }
-    bool is_Return { get; }
-    bool is_EarlyReturn { get; }
-    bool is_Break { get; }
-    bool is_TailRecursive { get; }
-    bool is_JumpTailCallStart { get; }
-    bool is_Halt { get; }
-    bool is_Print { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
-    DAST._IType dtor_typ { get; }
-    Std.Wrappers._IOption<DAST._IExpression> dtor_maybeValue { get; }
-    DAST._IAssignLhs dtor_lhs { get; }
-    DAST._IExpression dtor_value { get; }
-    DAST._IExpression dtor_cond { get; }
-    Dafny.ISequence<DAST._IStatement> dtor_thn { get; }
-    Dafny.ISequence<DAST._IStatement> dtor_els { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_lbl { get; }
-    Dafny.ISequence<DAST._IStatement> dtor_body { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_boundName { get; }
-    DAST._IType dtor_boundType { get; }
-    DAST._IExpression dtor_over { get; }
-    DAST._IExpression dtor_on { get; }
-    Dafny.ISequence<DAST._IType> dtor_typeArgs { get; }
-    Dafny.ISequence<DAST._IExpression> dtor_args { get; }
-    Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> dtor_outs { get; }
-    DAST._IExpression dtor_expr { get; }
-    Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> dtor_toLabel { get; }
-    DAST._IExpression dtor_Print_a0 { get; }
-    _IStatement DowncastClone();
-  }
-  public abstract class Statement : _IStatement {
-    public Statement() {
-    }
-    private static readonly DAST._IStatement theDefault = create_DeclareVar(Dafny.Sequence<Dafny.Rune>.Empty, DAST.Type.Default(), Std.Wrappers.Option<DAST._IExpression>.Default());
-    public static DAST._IStatement Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<DAST._IStatement> _TYPE = new Dafny.TypeDescriptor<DAST._IStatement>(DAST.Statement.Default());
-    public static Dafny.TypeDescriptor<DAST._IStatement> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IStatement create_DeclareVar(Dafny.ISequence<Dafny.Rune> name, DAST._IType typ, Std.Wrappers._IOption<DAST._IExpression> maybeValue) {
-      return new Statement_DeclareVar(name, typ, maybeValue);
-    }
-    public static _IStatement create_Assign(DAST._IAssignLhs lhs, DAST._IExpression @value) {
-      return new Statement_Assign(lhs, @value);
-    }
-    public static _IStatement create_If(DAST._IExpression cond, Dafny.ISequence<DAST._IStatement> thn, Dafny.ISequence<DAST._IStatement> els) {
-      return new Statement_If(cond, thn, els);
-    }
-    public static _IStatement create_Labeled(Dafny.ISequence<Dafny.Rune> lbl, Dafny.ISequence<DAST._IStatement> body) {
-      return new Statement_Labeled(lbl, body);
-    }
-    public static _IStatement create_While(DAST._IExpression cond, Dafny.ISequence<DAST._IStatement> body) {
-      return new Statement_While(cond, body);
-    }
-    public static _IStatement create_Foreach(Dafny.ISequence<Dafny.Rune> boundName, DAST._IType boundType, DAST._IExpression over, Dafny.ISequence<DAST._IStatement> body) {
-      return new Statement_Foreach(boundName, boundType, over, body);
-    }
-    public static _IStatement create_Call(DAST._IExpression @on, Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IType> typeArgs, Dafny.ISequence<DAST._IExpression> args, Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> outs) {
-      return new Statement_Call(@on, name, typeArgs, args, outs);
-    }
-    public static _IStatement create_Return(DAST._IExpression expr) {
-      return new Statement_Return(expr);
-    }
-    public static _IStatement create_EarlyReturn() {
-      return new Statement_EarlyReturn();
-    }
-    public static _IStatement create_Break(Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> toLabel) {
-      return new Statement_Break(toLabel);
-    }
-    public static _IStatement create_TailRecursive(Dafny.ISequence<DAST._IStatement> body) {
-      return new Statement_TailRecursive(body);
-    }
-    public static _IStatement create_JumpTailCallStart() {
-      return new Statement_JumpTailCallStart();
-    }
-    public static _IStatement create_Halt() {
-      return new Statement_Halt();
-    }
-    public static _IStatement create_Print(DAST._IExpression _a0) {
-      return new Statement_Print(_a0);
-    }
-    public bool is_DeclareVar { get { return this is Statement_DeclareVar; } }
-    public bool is_Assign { get { return this is Statement_Assign; } }
-    public bool is_If { get { return this is Statement_If; } }
-    public bool is_Labeled { get { return this is Statement_Labeled; } }
-    public bool is_While { get { return this is Statement_While; } }
-    public bool is_Foreach { get { return this is Statement_Foreach; } }
-    public bool is_Call { get { return this is Statement_Call; } }
-    public bool is_Return { get { return this is Statement_Return; } }
-    public bool is_EarlyReturn { get { return this is Statement_EarlyReturn; } }
-    public bool is_Break { get { return this is Statement_Break; } }
-    public bool is_TailRecursive { get { return this is Statement_TailRecursive; } }
-    public bool is_JumpTailCallStart { get { return this is Statement_JumpTailCallStart; } }
-    public bool is_Halt { get { return this is Statement_Halt; } }
-    public bool is_Print { get { return this is Statement_Print; } }
-    public Dafny.ISequence<Dafny.Rune> dtor_name {
-      get {
-        var d = this;
-        if (d is Statement_DeclareVar) { return ((Statement_DeclareVar)d)._name; }
-        return ((Statement_Call)d)._name;
-      }
-    }
-    public DAST._IType dtor_typ {
-      get {
-        var d = this;
-        return ((Statement_DeclareVar)d)._typ;
-      }
-    }
-    public Std.Wrappers._IOption<DAST._IExpression> dtor_maybeValue {
-      get {
-        var d = this;
-        return ((Statement_DeclareVar)d)._maybeValue;
-      }
-    }
-    public DAST._IAssignLhs dtor_lhs {
-      get {
-        var d = this;
-        return ((Statement_Assign)d)._lhs;
-      }
-    }
-    public DAST._IExpression dtor_value {
-      get {
-        var d = this;
-        return ((Statement_Assign)d)._value;
-      }
-    }
-    public DAST._IExpression dtor_cond {
-      get {
-        var d = this;
-        if (d is Statement_If) { return ((Statement_If)d)._cond; }
-        return ((Statement_While)d)._cond;
-      }
-    }
-    public Dafny.ISequence<DAST._IStatement> dtor_thn {
-      get {
-        var d = this;
-        return ((Statement_If)d)._thn;
-      }
-    }
-    public Dafny.ISequence<DAST._IStatement> dtor_els {
-      get {
-        var d = this;
-        return ((Statement_If)d)._els;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> dtor_lbl {
-      get {
-        var d = this;
-        return ((Statement_Labeled)d)._lbl;
-      }
-    }
-    public Dafny.ISequence<DAST._IStatement> dtor_body {
-      get {
-        var d = this;
-        if (d is Statement_Labeled) { return ((Statement_Labeled)d)._body; }
-        if (d is Statement_While) { return ((Statement_While)d)._body; }
-        if (d is Statement_Foreach) { return ((Statement_Foreach)d)._body; }
-        return ((Statement_TailRecursive)d)._body;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> dtor_boundName {
-      get {
-        var d = this;
-        return ((Statement_Foreach)d)._boundName;
-      }
-    }
-    public DAST._IType dtor_boundType {
-      get {
-        var d = this;
-        return ((Statement_Foreach)d)._boundType;
-      }
-    }
-    public DAST._IExpression dtor_over {
-      get {
-        var d = this;
-        return ((Statement_Foreach)d)._over;
-      }
-    }
-    public DAST._IExpression dtor_on {
-      get {
-        var d = this;
-        return ((Statement_Call)d)._on;
-      }
-    }
-    public Dafny.ISequence<DAST._IType> dtor_typeArgs {
-      get {
-        var d = this;
-        return ((Statement_Call)d)._typeArgs;
-      }
-    }
-    public Dafny.ISequence<DAST._IExpression> dtor_args {
-      get {
-        var d = this;
-        return ((Statement_Call)d)._args;
-      }
-    }
-    public Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> dtor_outs {
-      get {
-        var d = this;
-        return ((Statement_Call)d)._outs;
-      }
-    }
-    public DAST._IExpression dtor_expr {
-      get {
-        var d = this;
-        return ((Statement_Return)d)._expr;
-      }
-    }
-    public Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> dtor_toLabel {
-      get {
-        var d = this;
-        return ((Statement_Break)d)._toLabel;
-      }
-    }
-    public DAST._IExpression dtor_Print_a0 {
-      get {
-        var d = this;
-        return ((Statement_Print)d)._a0;
-      }
-    }
-    public abstract _IStatement DowncastClone();
-  }
-  public class Statement_DeclareVar : Statement {
-    public readonly Dafny.ISequence<Dafny.Rune> _name;
-    public readonly DAST._IType _typ;
-    public readonly Std.Wrappers._IOption<DAST._IExpression> _maybeValue;
-    public Statement_DeclareVar(Dafny.ISequence<Dafny.Rune> name, DAST._IType typ, Std.Wrappers._IOption<DAST._IExpression> maybeValue) : base() {
-      this._name = name;
-      this._typ = typ;
-      this._maybeValue = maybeValue;
-    }
-    public override _IStatement DowncastClone() {
-      if (this is _IStatement dt) { return dt; }
-      return new Statement_DeclareVar(_name, _typ, _maybeValue);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Statement_DeclareVar;
-      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._typ, oth._typ) && object.Equals(this._maybeValue, oth._maybeValue);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typ));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._maybeValue));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Statement.DeclareVar";
-      s += "(";
-      s += this._name.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._typ);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._maybeValue);
-      s += ")";
-      return s;
-    }
-  }
-  public class Statement_Assign : Statement {
-    public readonly DAST._IAssignLhs _lhs;
-    public readonly DAST._IExpression _value;
-    public Statement_Assign(DAST._IAssignLhs lhs, DAST._IExpression @value) : base() {
-      this._lhs = lhs;
-      this._value = @value;
-    }
-    public override _IStatement DowncastClone() {
-      if (this is _IStatement dt) { return dt; }
-      return new Statement_Assign(_lhs, _value);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Statement_Assign;
-      return oth != null && object.Equals(this._lhs, oth._lhs) && object.Equals(this._value, oth._value);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 1;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._lhs));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._value));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Statement.Assign";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._lhs);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._value);
-      s += ")";
-      return s;
-    }
-  }
-  public class Statement_If : Statement {
-    public readonly DAST._IExpression _cond;
-    public readonly Dafny.ISequence<DAST._IStatement> _thn;
-    public readonly Dafny.ISequence<DAST._IStatement> _els;
-    public Statement_If(DAST._IExpression cond, Dafny.ISequence<DAST._IStatement> thn, Dafny.ISequence<DAST._IStatement> els) : base() {
-      this._cond = cond;
-      this._thn = thn;
-      this._els = els;
-    }
-    public override _IStatement DowncastClone() {
-      if (this is _IStatement dt) { return dt; }
-      return new Statement_If(_cond, _thn, _els);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Statement_If;
-      return oth != null && object.Equals(this._cond, oth._cond) && object.Equals(this._thn, oth._thn) && object.Equals(this._els, oth._els);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 2;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._cond));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._thn));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._els));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Statement.If";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._cond);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._thn);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._els);
-      s += ")";
-      return s;
-    }
-  }
-  public class Statement_Labeled : Statement {
-    public readonly Dafny.ISequence<Dafny.Rune> _lbl;
-    public readonly Dafny.ISequence<DAST._IStatement> _body;
-    public Statement_Labeled(Dafny.ISequence<Dafny.Rune> lbl, Dafny.ISequence<DAST._IStatement> body) : base() {
-      this._lbl = lbl;
-      this._body = body;
-    }
-    public override _IStatement DowncastClone() {
-      if (this is _IStatement dt) { return dt; }
-      return new Statement_Labeled(_lbl, _body);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Statement_Labeled;
-      return oth != null && object.Equals(this._lbl, oth._lbl) && object.Equals(this._body, oth._body);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 3;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._lbl));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Statement.Labeled";
-      s += "(";
-      s += this._lbl.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._body);
-      s += ")";
-      return s;
-    }
-  }
-  public class Statement_While : Statement {
-    public readonly DAST._IExpression _cond;
-    public readonly Dafny.ISequence<DAST._IStatement> _body;
-    public Statement_While(DAST._IExpression cond, Dafny.ISequence<DAST._IStatement> body) : base() {
-      this._cond = cond;
-      this._body = body;
-    }
-    public override _IStatement DowncastClone() {
-      if (this is _IStatement dt) { return dt; }
-      return new Statement_While(_cond, _body);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Statement_While;
-      return oth != null && object.Equals(this._cond, oth._cond) && object.Equals(this._body, oth._body);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 4;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._cond));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Statement.While";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._cond);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._body);
-      s += ")";
-      return s;
-    }
-  }
-  public class Statement_Foreach : Statement {
-    public readonly Dafny.ISequence<Dafny.Rune> _boundName;
-    public readonly DAST._IType _boundType;
-    public readonly DAST._IExpression _over;
-    public readonly Dafny.ISequence<DAST._IStatement> _body;
-    public Statement_Foreach(Dafny.ISequence<Dafny.Rune> boundName, DAST._IType boundType, DAST._IExpression over, Dafny.ISequence<DAST._IStatement> body) : base() {
-      this._boundName = boundName;
-      this._boundType = boundType;
-      this._over = over;
-      this._body = body;
-    }
-    public override _IStatement DowncastClone() {
-      if (this is _IStatement dt) { return dt; }
-      return new Statement_Foreach(_boundName, _boundType, _over, _body);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Statement_Foreach;
-      return oth != null && object.Equals(this._boundName, oth._boundName) && object.Equals(this._boundType, oth._boundType) && object.Equals(this._over, oth._over) && object.Equals(this._body, oth._body);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 5;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._boundName));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._boundType));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._over));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Statement.Foreach";
-      s += "(";
-      s += this._boundName.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._boundType);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._over);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._body);
-      s += ")";
-      return s;
-    }
-  }
-  public class Statement_Call : Statement {
-    public readonly DAST._IExpression _on;
-    public readonly Dafny.ISequence<Dafny.Rune> _name;
-    public readonly Dafny.ISequence<DAST._IType> _typeArgs;
-    public readonly Dafny.ISequence<DAST._IExpression> _args;
-    public readonly Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> _outs;
-    public Statement_Call(DAST._IExpression @on, Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IType> typeArgs, Dafny.ISequence<DAST._IExpression> args, Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> outs) : base() {
-      this._on = @on;
-      this._name = name;
-      this._typeArgs = typeArgs;
-      this._args = args;
-      this._outs = outs;
-    }
-    public override _IStatement DowncastClone() {
-      if (this is _IStatement dt) { return dt; }
-      return new Statement_Call(_on, _name, _typeArgs, _args, _outs);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Statement_Call;
-      return oth != null && object.Equals(this._on, oth._on) && object.Equals(this._name, oth._name) && object.Equals(this._typeArgs, oth._typeArgs) && object.Equals(this._args, oth._args) && object.Equals(this._outs, oth._outs);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 6;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._on));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeArgs));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._args));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._outs));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Statement.Call";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._on);
-      s += ", ";
-      s += this._name.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._typeArgs);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._args);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._outs);
-      s += ")";
-      return s;
-    }
-  }
-  public class Statement_Return : Statement {
-    public readonly DAST._IExpression _expr;
-    public Statement_Return(DAST._IExpression expr) : base() {
-      this._expr = expr;
-    }
-    public override _IStatement DowncastClone() {
-      if (this is _IStatement dt) { return dt; }
-      return new Statement_Return(_expr);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Statement_Return;
-      return oth != null && object.Equals(this._expr, oth._expr);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 7;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Statement.Return";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._expr);
-      s += ")";
-      return s;
-    }
-  }
-  public class Statement_EarlyReturn : Statement {
-    public Statement_EarlyReturn() : base() {
-    }
-    public override _IStatement DowncastClone() {
-      if (this is _IStatement dt) { return dt; }
-      return new Statement_EarlyReturn();
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Statement_EarlyReturn;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 8;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Statement.EarlyReturn";
-      return s;
-    }
-  }
-  public class Statement_Break : Statement {
-    public readonly Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _toLabel;
-    public Statement_Break(Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> toLabel) : base() {
-      this._toLabel = toLabel;
-    }
-    public override _IStatement DowncastClone() {
-      if (this is _IStatement dt) { return dt; }
-      return new Statement_Break(_toLabel);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Statement_Break;
-      return oth != null && object.Equals(this._toLabel, oth._toLabel);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 9;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._toLabel));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Statement.Break";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._toLabel);
-      s += ")";
-      return s;
-    }
-  }
-  public class Statement_TailRecursive : Statement {
-    public readonly Dafny.ISequence<DAST._IStatement> _body;
-    public Statement_TailRecursive(Dafny.ISequence<DAST._IStatement> body) : base() {
-      this._body = body;
-    }
-    public override _IStatement DowncastClone() {
-      if (this is _IStatement dt) { return dt; }
-      return new Statement_TailRecursive(_body);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Statement_TailRecursive;
-      return oth != null && object.Equals(this._body, oth._body);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 10;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Statement.TailRecursive";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._body);
-      s += ")";
-      return s;
-    }
-  }
-  public class Statement_JumpTailCallStart : Statement {
-    public Statement_JumpTailCallStart() : base() {
-    }
-    public override _IStatement DowncastClone() {
-      if (this is _IStatement dt) { return dt; }
-      return new Statement_JumpTailCallStart();
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Statement_JumpTailCallStart;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 11;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Statement.JumpTailCallStart";
-      return s;
-    }
-  }
-  public class Statement_Halt : Statement {
-    public Statement_Halt() : base() {
-    }
-    public override _IStatement DowncastClone() {
-      if (this is _IStatement dt) { return dt; }
-      return new Statement_Halt();
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Statement_Halt;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 12;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Statement.Halt";
-      return s;
-    }
-  }
-  public class Statement_Print : Statement {
-    public readonly DAST._IExpression _a0;
-    public Statement_Print(DAST._IExpression _a0) : base() {
-      this._a0 = _a0;
-    }
-    public override _IStatement DowncastClone() {
-      if (this is _IStatement dt) { return dt; }
-      return new Statement_Print(_a0);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Statement_Print;
-      return oth != null && object.Equals(this._a0, oth._a0);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 13;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Statement.Print";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._a0);
-      s += ")";
-      return s;
-    }
-  }
-
-  public interface _IAssignLhs {
-    bool is_Ident { get; }
-    bool is_Select { get; }
-    bool is_Index { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_Ident_a0 { get; }
-    DAST._IExpression dtor_expr { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_field { get; }
-    Dafny.ISequence<DAST._IExpression> dtor_indices { get; }
-    _IAssignLhs DowncastClone();
-  }
-  public abstract class AssignLhs : _IAssignLhs {
-    public AssignLhs() {
-    }
-    private static readonly DAST._IAssignLhs theDefault = create_Ident(Dafny.Sequence<Dafny.Rune>.Empty);
-    public static DAST._IAssignLhs Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<DAST._IAssignLhs> _TYPE = new Dafny.TypeDescriptor<DAST._IAssignLhs>(DAST.AssignLhs.Default());
-    public static Dafny.TypeDescriptor<DAST._IAssignLhs> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IAssignLhs create_Ident(Dafny.ISequence<Dafny.Rune> _a0) {
-      return new AssignLhs_Ident(_a0);
-    }
-    public static _IAssignLhs create_Select(DAST._IExpression expr, Dafny.ISequence<Dafny.Rune> field) {
-      return new AssignLhs_Select(expr, field);
-    }
-    public static _IAssignLhs create_Index(DAST._IExpression expr, Dafny.ISequence<DAST._IExpression> indices) {
-      return new AssignLhs_Index(expr, indices);
-    }
-    public bool is_Ident { get { return this is AssignLhs_Ident; } }
-    public bool is_Select { get { return this is AssignLhs_Select; } }
-    public bool is_Index { get { return this is AssignLhs_Index; } }
-    public Dafny.ISequence<Dafny.Rune> dtor_Ident_a0 {
-      get {
-        var d = this;
-        return ((AssignLhs_Ident)d)._a0;
-      }
-    }
-    public DAST._IExpression dtor_expr {
-      get {
-        var d = this;
-        if (d is AssignLhs_Select) { return ((AssignLhs_Select)d)._expr; }
-        return ((AssignLhs_Index)d)._expr;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> dtor_field {
-      get {
-        var d = this;
-        return ((AssignLhs_Select)d)._field;
-      }
-    }
-    public Dafny.ISequence<DAST._IExpression> dtor_indices {
-      get {
-        var d = this;
-        return ((AssignLhs_Index)d)._indices;
-      }
-    }
-    public abstract _IAssignLhs DowncastClone();
-  }
-  public class AssignLhs_Ident : AssignLhs {
-    public readonly Dafny.ISequence<Dafny.Rune> _a0;
-    public AssignLhs_Ident(Dafny.ISequence<Dafny.Rune> _a0) : base() {
-      this._a0 = _a0;
-    }
-    public override _IAssignLhs DowncastClone() {
-      if (this is _IAssignLhs dt) { return dt; }
-      return new AssignLhs_Ident(_a0);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.AssignLhs_Ident;
-      return oth != null && object.Equals(this._a0, oth._a0);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.AssignLhs.Ident";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._a0);
-      s += ")";
-      return s;
-    }
-  }
-  public class AssignLhs_Select : AssignLhs {
-    public readonly DAST._IExpression _expr;
-    public readonly Dafny.ISequence<Dafny.Rune> _field;
-    public AssignLhs_Select(DAST._IExpression expr, Dafny.ISequence<Dafny.Rune> field) : base() {
-      this._expr = expr;
-      this._field = field;
-    }
-    public override _IAssignLhs DowncastClone() {
-      if (this is _IAssignLhs dt) { return dt; }
-      return new AssignLhs_Select(_expr, _field);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.AssignLhs_Select;
-      return oth != null && object.Equals(this._expr, oth._expr) && object.Equals(this._field, oth._field);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 1;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._field));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.AssignLhs.Select";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._expr);
-      s += ", ";
-      s += this._field.ToVerbatimString(true);
-      s += ")";
-      return s;
-    }
-  }
-  public class AssignLhs_Index : AssignLhs {
-    public readonly DAST._IExpression _expr;
-    public readonly Dafny.ISequence<DAST._IExpression> _indices;
-    public AssignLhs_Index(DAST._IExpression expr, Dafny.ISequence<DAST._IExpression> indices) : base() {
-      this._expr = expr;
-      this._indices = indices;
-    }
-    public override _IAssignLhs DowncastClone() {
-      if (this is _IAssignLhs dt) { return dt; }
-      return new AssignLhs_Index(_expr, _indices);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.AssignLhs_Index;
-      return oth != null && object.Equals(this._expr, oth._expr) && object.Equals(this._indices, oth._indices);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 2;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._indices));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.AssignLhs.Index";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._expr);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._indices);
-      s += ")";
-      return s;
-    }
-  }
-
-  public interface _ICollKind {
-    bool is_Seq { get; }
-    bool is_Array { get; }
-    bool is_Map { get; }
-    _ICollKind DowncastClone();
-  }
-  public abstract class CollKind : _ICollKind {
-    public CollKind() {
-    }
-    private static readonly DAST._ICollKind theDefault = create_Seq();
-    public static DAST._ICollKind Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<DAST._ICollKind> _TYPE = new Dafny.TypeDescriptor<DAST._ICollKind>(DAST.CollKind.Default());
-    public static Dafny.TypeDescriptor<DAST._ICollKind> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _ICollKind create_Seq() {
-      return new CollKind_Seq();
-    }
-    public static _ICollKind create_Array() {
-      return new CollKind_Array();
-    }
-    public static _ICollKind create_Map() {
-      return new CollKind_Map();
-    }
-    public bool is_Seq { get { return this is CollKind_Seq; } }
-    public bool is_Array { get { return this is CollKind_Array; } }
-    public bool is_Map { get { return this is CollKind_Map; } }
-    public static System.Collections.Generic.IEnumerable<_ICollKind> AllSingletonConstructors {
-      get {
-        yield return CollKind.create_Seq();
-        yield return CollKind.create_Array();
-        yield return CollKind.create_Map();
-      }
-    }
-    public abstract _ICollKind DowncastClone();
-  }
-  public class CollKind_Seq : CollKind {
-    public CollKind_Seq() : base() {
-    }
-    public override _ICollKind DowncastClone() {
-      if (this is _ICollKind dt) { return dt; }
-      return new CollKind_Seq();
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.CollKind_Seq;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.CollKind.Seq";
-      return s;
-    }
-  }
-  public class CollKind_Array : CollKind {
-    public CollKind_Array() : base() {
-    }
-    public override _ICollKind DowncastClone() {
-      if (this is _ICollKind dt) { return dt; }
-      return new CollKind_Array();
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.CollKind_Array;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 1;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.CollKind.Array";
-      return s;
-    }
-  }
-  public class CollKind_Map : CollKind {
-    public CollKind_Map() : base() {
-    }
-    public override _ICollKind DowncastClone() {
-      if (this is _ICollKind dt) { return dt; }
-      return new CollKind_Map();
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.CollKind_Map;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 2;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.CollKind.Map";
-      return s;
-    }
-  }
-
-  public interface _IBinOp {
-    bool is_Eq { get; }
-    bool is_Neq { get; }
-    bool is_Div { get; }
-    bool is_EuclidianDiv { get; }
-    bool is_Mod { get; }
-    bool is_EuclidianMod { get; }
-    bool is_Implies { get; }
-    bool is_In { get; }
-    bool is_NotIn { get; }
-    bool is_SetDifference { get; }
-    bool is_Concat { get; }
-    bool is_Passthrough { get; }
-    bool dtor_referential { get; }
-    bool dtor_nullable { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_Passthrough_a0 { get; }
-    _IBinOp DowncastClone();
-  }
-  public abstract class BinOp : _IBinOp {
-    public BinOp() {
-    }
-    private static readonly DAST._IBinOp theDefault = create_Eq(false, false);
-    public static DAST._IBinOp Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<DAST._IBinOp> _TYPE = new Dafny.TypeDescriptor<DAST._IBinOp>(DAST.BinOp.Default());
-    public static Dafny.TypeDescriptor<DAST._IBinOp> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IBinOp create_Eq(bool referential, bool nullable) {
-      return new BinOp_Eq(referential, nullable);
-    }
-    public static _IBinOp create_Neq(bool referential, bool nullable) {
-      return new BinOp_Neq(referential, nullable);
-    }
-    public static _IBinOp create_Div() {
-      return new BinOp_Div();
-    }
-    public static _IBinOp create_EuclidianDiv() {
-      return new BinOp_EuclidianDiv();
-    }
-    public static _IBinOp create_Mod() {
-      return new BinOp_Mod();
-    }
-    public static _IBinOp create_EuclidianMod() {
-      return new BinOp_EuclidianMod();
-    }
-    public static _IBinOp create_Implies() {
-      return new BinOp_Implies();
-    }
-    public static _IBinOp create_In() {
-      return new BinOp_In();
-    }
-    public static _IBinOp create_NotIn() {
-      return new BinOp_NotIn();
-    }
-    public static _IBinOp create_SetDifference() {
-      return new BinOp_SetDifference();
-    }
-    public static _IBinOp create_Concat() {
-      return new BinOp_Concat();
-    }
-    public static _IBinOp create_Passthrough(Dafny.ISequence<Dafny.Rune> _a0) {
-      return new BinOp_Passthrough(_a0);
-    }
-    public bool is_Eq { get { return this is BinOp_Eq; } }
-    public bool is_Neq { get { return this is BinOp_Neq; } }
-    public bool is_Div { get { return this is BinOp_Div; } }
-    public bool is_EuclidianDiv { get { return this is BinOp_EuclidianDiv; } }
-    public bool is_Mod { get { return this is BinOp_Mod; } }
-    public bool is_EuclidianMod { get { return this is BinOp_EuclidianMod; } }
-    public bool is_Implies { get { return this is BinOp_Implies; } }
-    public bool is_In { get { return this is BinOp_In; } }
-    public bool is_NotIn { get { return this is BinOp_NotIn; } }
-    public bool is_SetDifference { get { return this is BinOp_SetDifference; } }
-    public bool is_Concat { get { return this is BinOp_Concat; } }
-    public bool is_Passthrough { get { return this is BinOp_Passthrough; } }
-    public bool dtor_referential {
-      get {
-        var d = this;
-        if (d is BinOp_Eq) { return ((BinOp_Eq)d)._referential; }
-        return ((BinOp_Neq)d)._referential;
-      }
-    }
-    public bool dtor_nullable {
-      get {
-        var d = this;
-        if (d is BinOp_Eq) { return ((BinOp_Eq)d)._nullable; }
-        return ((BinOp_Neq)d)._nullable;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> dtor_Passthrough_a0 {
-      get {
-        var d = this;
-        return ((BinOp_Passthrough)d)._a0;
-      }
-    }
-    public abstract _IBinOp DowncastClone();
-  }
-  public class BinOp_Eq : BinOp {
-    public readonly bool _referential;
-    public readonly bool _nullable;
-    public BinOp_Eq(bool referential, bool nullable) : base() {
-      this._referential = referential;
-      this._nullable = nullable;
-    }
-    public override _IBinOp DowncastClone() {
-      if (this is _IBinOp dt) { return dt; }
-      return new BinOp_Eq(_referential, _nullable);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.BinOp_Eq;
-      return oth != null && this._referential == oth._referential && this._nullable == oth._nullable;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._referential));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._nullable));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.BinOp.Eq";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._referential);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._nullable);
-      s += ")";
-      return s;
-    }
-  }
-  public class BinOp_Neq : BinOp {
-    public readonly bool _referential;
-    public readonly bool _nullable;
-    public BinOp_Neq(bool referential, bool nullable) : base() {
-      this._referential = referential;
-      this._nullable = nullable;
-    }
-    public override _IBinOp DowncastClone() {
-      if (this is _IBinOp dt) { return dt; }
-      return new BinOp_Neq(_referential, _nullable);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.BinOp_Neq;
-      return oth != null && this._referential == oth._referential && this._nullable == oth._nullable;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 1;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._referential));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._nullable));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.BinOp.Neq";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._referential);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._nullable);
-      s += ")";
-      return s;
-    }
-  }
-  public class BinOp_Div : BinOp {
-    public BinOp_Div() : base() {
-    }
-    public override _IBinOp DowncastClone() {
-      if (this is _IBinOp dt) { return dt; }
-      return new BinOp_Div();
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.BinOp_Div;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 2;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.BinOp.Div";
-      return s;
-    }
-  }
-  public class BinOp_EuclidianDiv : BinOp {
-    public BinOp_EuclidianDiv() : base() {
-    }
-    public override _IBinOp DowncastClone() {
-      if (this is _IBinOp dt) { return dt; }
-      return new BinOp_EuclidianDiv();
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.BinOp_EuclidianDiv;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 3;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.BinOp.EuclidianDiv";
-      return s;
-    }
-  }
-  public class BinOp_Mod : BinOp {
-    public BinOp_Mod() : base() {
-    }
-    public override _IBinOp DowncastClone() {
-      if (this is _IBinOp dt) { return dt; }
-      return new BinOp_Mod();
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.BinOp_Mod;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 4;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.BinOp.Mod";
-      return s;
-    }
-  }
-  public class BinOp_EuclidianMod : BinOp {
-    public BinOp_EuclidianMod() : base() {
-    }
-    public override _IBinOp DowncastClone() {
-      if (this is _IBinOp dt) { return dt; }
-      return new BinOp_EuclidianMod();
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.BinOp_EuclidianMod;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 5;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.BinOp.EuclidianMod";
-      return s;
-    }
-  }
-  public class BinOp_Implies : BinOp {
-    public BinOp_Implies() : base() {
-    }
-    public override _IBinOp DowncastClone() {
-      if (this is _IBinOp dt) { return dt; }
-      return new BinOp_Implies();
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.BinOp_Implies;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 6;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.BinOp.Implies";
-      return s;
-    }
-  }
-  public class BinOp_In : BinOp {
-    public BinOp_In() : base() {
-    }
-    public override _IBinOp DowncastClone() {
-      if (this is _IBinOp dt) { return dt; }
-      return new BinOp_In();
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.BinOp_In;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 7;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.BinOp.In";
-      return s;
-    }
-  }
-  public class BinOp_NotIn : BinOp {
-    public BinOp_NotIn() : base() {
-    }
-    public override _IBinOp DowncastClone() {
-      if (this is _IBinOp dt) { return dt; }
-      return new BinOp_NotIn();
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.BinOp_NotIn;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 8;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.BinOp.NotIn";
-      return s;
-    }
-  }
-  public class BinOp_SetDifference : BinOp {
-    public BinOp_SetDifference() : base() {
-    }
-    public override _IBinOp DowncastClone() {
-      if (this is _IBinOp dt) { return dt; }
-      return new BinOp_SetDifference();
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.BinOp_SetDifference;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 9;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.BinOp.SetDifference";
-      return s;
-    }
-  }
-  public class BinOp_Concat : BinOp {
-    public BinOp_Concat() : base() {
-    }
-    public override _IBinOp DowncastClone() {
-      if (this is _IBinOp dt) { return dt; }
-      return new BinOp_Concat();
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.BinOp_Concat;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 10;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.BinOp.Concat";
-      return s;
-    }
-  }
-  public class BinOp_Passthrough : BinOp {
-    public readonly Dafny.ISequence<Dafny.Rune> _a0;
-    public BinOp_Passthrough(Dafny.ISequence<Dafny.Rune> _a0) : base() {
-      this._a0 = _a0;
-    }
-    public override _IBinOp DowncastClone() {
-      if (this is _IBinOp dt) { return dt; }
-      return new BinOp_Passthrough(_a0);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.BinOp_Passthrough;
-      return oth != null && object.Equals(this._a0, oth._a0);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 11;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.BinOp.Passthrough";
-      s += "(";
-      s += this._a0.ToVerbatimString(true);
-      s += ")";
-      return s;
-    }
-  }
-
-  public interface _IExpression {
-    bool is_Literal { get; }
-    bool is_Ident { get; }
-    bool is_Companion { get; }
-    bool is_Tuple { get; }
-    bool is_New { get; }
-    bool is_NewArray { get; }
-    bool is_DatatypeValue { get; }
-    bool is_Convert { get; }
-    bool is_SeqConstruct { get; }
-    bool is_SeqValue { get; }
-    bool is_SetValue { get; }
-    bool is_MapValue { get; }
-    bool is_This { get; }
-    bool is_Ite { get; }
-    bool is_UnOp { get; }
-    bool is_BinOp { get; }
-    bool is_ArrayLen { get; }
-    bool is_Select { get; }
-    bool is_SelectFn { get; }
-    bool is_Index { get; }
-    bool is_IndexRange { get; }
-    bool is_TupleSelect { get; }
-    bool is_Call { get; }
-    bool is_Lambda { get; }
-    bool is_BetaRedex { get; }
-    bool is_IIFE { get; }
-    bool is_Apply { get; }
-    bool is_TypeTest { get; }
-    bool is_InitializationValue { get; }
-    bool is_BoolBoundedPool { get; }
-    bool is_SetBoundedPool { get; }
-    bool is_SeqBoundedPool { get; }
-    bool is_IntRange { get; }
-    DAST._ILiteral dtor_Literal_a0 { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_Ident_a0 { get; }
-    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_Companion_a0 { get; }
-    Dafny.ISequence<DAST._IExpression> dtor_Tuple_a0 { get; }
-    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_path { get; }
-    Dafny.ISequence<DAST._IType> dtor_typeArgs { get; }
-    Dafny.ISequence<DAST._IExpression> dtor_args { get; }
-    Dafny.ISequence<DAST._IExpression> dtor_dims { get; }
-    DAST._IType dtor_typ { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_variant { get; }
-    bool dtor_isCo { get; }
-    Dafny.ISequence<_System._ITuple2<Dafny.ISequence<Dafny.Rune>, DAST._IExpression>> dtor_contents { get; }
-    DAST._IExpression dtor_value { get; }
-    DAST._IType dtor_from { get; }
-    DAST._IExpression dtor_length { get; }
-    DAST._IExpression dtor_elem { get; }
-    Dafny.ISequence<DAST._IExpression> dtor_elements { get; }
-    Dafny.ISequence<_System._ITuple2<DAST._IExpression, DAST._IExpression>> dtor_mapElems { get; }
-    DAST._IExpression dtor_cond { get; }
-    DAST._IExpression dtor_thn { get; }
-    DAST._IExpression dtor_els { get; }
-    DAST._IUnaryOp dtor_unOp { get; }
-    DAST._IExpression dtor_expr { get; }
-    DAST._IBinOp dtor_op { get; }
-    DAST._IExpression dtor_left { get; }
-    DAST._IExpression dtor_right { get; }
-    BigInteger dtor_dim { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_field { get; }
-    bool dtor_isConstant { get; }
-    bool dtor_onDatatype { get; }
-    bool dtor_isStatic { get; }
-    BigInteger dtor_arity { get; }
-    DAST._ICollKind dtor_collKind { get; }
-    Dafny.ISequence<DAST._IExpression> dtor_indices { get; }
-    bool dtor_isArray { get; }
-    Std.Wrappers._IOption<DAST._IExpression> dtor_low { get; }
-    Std.Wrappers._IOption<DAST._IExpression> dtor_high { get; }
-    BigInteger dtor_index { get; }
-    DAST._IExpression dtor_on { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
-    Dafny.ISequence<DAST._IFormal> dtor_params { get; }
-    DAST._IType dtor_retType { get; }
-    Dafny.ISequence<DAST._IStatement> dtor_body { get; }
-    Dafny.ISequence<_System._ITuple2<DAST._IFormal, DAST._IExpression>> dtor_values { get; }
-    DAST._IExpression dtor_iifeBody { get; }
-    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_dType { get; }
-    DAST._IExpression dtor_of { get; }
-    bool dtor_includeDuplicates { get; }
-    DAST._IExpression dtor_lo { get; }
-    DAST._IExpression dtor_hi { get; }
-    _IExpression DowncastClone();
-  }
-  public abstract class Expression : _IExpression {
-    public Expression() {
-    }
-    private static readonly DAST._IExpression theDefault = create_Literal(DAST.Literal.Default());
-    public static DAST._IExpression Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<DAST._IExpression> _TYPE = new Dafny.TypeDescriptor<DAST._IExpression>(DAST.Expression.Default());
-    public static Dafny.TypeDescriptor<DAST._IExpression> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IExpression create_Literal(DAST._ILiteral _a0) {
-      return new Expression_Literal(_a0);
-    }
-    public static _IExpression create_Ident(Dafny.ISequence<Dafny.Rune> _a0) {
-      return new Expression_Ident(_a0);
-    }
-    public static _IExpression create_Companion(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _a0) {
-      return new Expression_Companion(_a0);
-    }
-    public static _IExpression create_Tuple(Dafny.ISequence<DAST._IExpression> _a0) {
-      return new Expression_Tuple(_a0);
-    }
-    public static _IExpression create_New(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> path, Dafny.ISequence<DAST._IType> typeArgs, Dafny.ISequence<DAST._IExpression> args) {
-      return new Expression_New(path, typeArgs, args);
-    }
-    public static _IExpression create_NewArray(Dafny.ISequence<DAST._IExpression> dims, DAST._IType typ) {
-      return new Expression_NewArray(dims, typ);
-    }
-    public static _IExpression create_DatatypeValue(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> path, Dafny.ISequence<DAST._IType> typeArgs, Dafny.ISequence<Dafny.Rune> variant, bool isCo, Dafny.ISequence<_System._ITuple2<Dafny.ISequence<Dafny.Rune>, DAST._IExpression>> contents) {
-      return new Expression_DatatypeValue(path, typeArgs, variant, isCo, contents);
-    }
-    public static _IExpression create_Convert(DAST._IExpression @value, DAST._IType @from, DAST._IType typ) {
-      return new Expression_Convert(@value, @from, typ);
-    }
-    public static _IExpression create_SeqConstruct(DAST._IExpression length, DAST._IExpression elem) {
-      return new Expression_SeqConstruct(length, elem);
-    }
-    public static _IExpression create_SeqValue(Dafny.ISequence<DAST._IExpression> elements, DAST._IType typ) {
-      return new Expression_SeqValue(elements, typ);
-    }
-    public static _IExpression create_SetValue(Dafny.ISequence<DAST._IExpression> elements) {
-      return new Expression_SetValue(elements);
-    }
-    public static _IExpression create_MapValue(Dafny.ISequence<_System._ITuple2<DAST._IExpression, DAST._IExpression>> mapElems) {
-      return new Expression_MapValue(mapElems);
-    }
-    public static _IExpression create_This() {
-      return new Expression_This();
-    }
-    public static _IExpression create_Ite(DAST._IExpression cond, DAST._IExpression thn, DAST._IExpression els) {
-      return new Expression_Ite(cond, thn, els);
-    }
-    public static _IExpression create_UnOp(DAST._IUnaryOp unOp, DAST._IExpression expr) {
-      return new Expression_UnOp(unOp, expr);
-    }
-    public static _IExpression create_BinOp(DAST._IBinOp op, DAST._IExpression left, DAST._IExpression right) {
-      return new Expression_BinOp(op, left, right);
-    }
-    public static _IExpression create_ArrayLen(DAST._IExpression expr, BigInteger dim) {
-      return new Expression_ArrayLen(expr, dim);
-    }
-    public static _IExpression create_Select(DAST._IExpression expr, Dafny.ISequence<Dafny.Rune> field, bool isConstant, bool onDatatype) {
-      return new Expression_Select(expr, field, isConstant, onDatatype);
-    }
-    public static _IExpression create_SelectFn(DAST._IExpression expr, Dafny.ISequence<Dafny.Rune> field, bool onDatatype, bool isStatic, BigInteger arity) {
-      return new Expression_SelectFn(expr, field, onDatatype, isStatic, arity);
-    }
-    public static _IExpression create_Index(DAST._IExpression expr, DAST._ICollKind collKind, Dafny.ISequence<DAST._IExpression> indices) {
-      return new Expression_Index(expr, collKind, indices);
-    }
-    public static _IExpression create_IndexRange(DAST._IExpression expr, bool isArray, Std.Wrappers._IOption<DAST._IExpression> low, Std.Wrappers._IOption<DAST._IExpression> high) {
-      return new Expression_IndexRange(expr, isArray, low, high);
-    }
-    public static _IExpression create_TupleSelect(DAST._IExpression expr, BigInteger index) {
-      return new Expression_TupleSelect(expr, index);
-    }
-    public static _IExpression create_Call(DAST._IExpression @on, Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IType> typeArgs, Dafny.ISequence<DAST._IExpression> args) {
-      return new Expression_Call(@on, name, typeArgs, args);
-    }
-    public static _IExpression create_Lambda(Dafny.ISequence<DAST._IFormal> @params, DAST._IType retType, Dafny.ISequence<DAST._IStatement> body) {
-      return new Expression_Lambda(@params, retType, body);
-    }
-    public static _IExpression create_BetaRedex(Dafny.ISequence<_System._ITuple2<DAST._IFormal, DAST._IExpression>> values, DAST._IType retType, DAST._IExpression expr) {
-      return new Expression_BetaRedex(values, retType, expr);
-    }
-    public static _IExpression create_IIFE(Dafny.ISequence<Dafny.Rune> name, DAST._IType typ, DAST._IExpression @value, DAST._IExpression iifeBody) {
-      return new Expression_IIFE(name, typ, @value, iifeBody);
-    }
-    public static _IExpression create_Apply(DAST._IExpression expr, Dafny.ISequence<DAST._IExpression> args) {
-      return new Expression_Apply(expr, args);
-    }
-    public static _IExpression create_TypeTest(DAST._IExpression @on, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dType, Dafny.ISequence<Dafny.Rune> variant) {
-      return new Expression_TypeTest(@on, dType, variant);
-    }
-    public static _IExpression create_InitializationValue(DAST._IType typ) {
-      return new Expression_InitializationValue(typ);
-    }
-    public static _IExpression create_BoolBoundedPool() {
-      return new Expression_BoolBoundedPool();
-    }
-    public static _IExpression create_SetBoundedPool(DAST._IExpression of) {
-      return new Expression_SetBoundedPool(of);
-    }
-    public static _IExpression create_SeqBoundedPool(DAST._IExpression of, bool includeDuplicates) {
-      return new Expression_SeqBoundedPool(of, includeDuplicates);
-    }
-    public static _IExpression create_IntRange(DAST._IExpression lo, DAST._IExpression hi) {
-      return new Expression_IntRange(lo, hi);
-    }
-    public bool is_Literal { get { return this is Expression_Literal; } }
-    public bool is_Ident { get { return this is Expression_Ident; } }
-    public bool is_Companion { get { return this is Expression_Companion; } }
-    public bool is_Tuple { get { return this is Expression_Tuple; } }
-    public bool is_New { get { return this is Expression_New; } }
-    public bool is_NewArray { get { return this is Expression_NewArray; } }
-    public bool is_DatatypeValue { get { return this is Expression_DatatypeValue; } }
-    public bool is_Convert { get { return this is Expression_Convert; } }
-    public bool is_SeqConstruct { get { return this is Expression_SeqConstruct; } }
-    public bool is_SeqValue { get { return this is Expression_SeqValue; } }
-    public bool is_SetValue { get { return this is Expression_SetValue; } }
-    public bool is_MapValue { get { return this is Expression_MapValue; } }
-    public bool is_This { get { return this is Expression_This; } }
-    public bool is_Ite { get { return this is Expression_Ite; } }
-    public bool is_UnOp { get { return this is Expression_UnOp; } }
-    public bool is_BinOp { get { return this is Expression_BinOp; } }
-    public bool is_ArrayLen { get { return this is Expression_ArrayLen; } }
-    public bool is_Select { get { return this is Expression_Select; } }
-    public bool is_SelectFn { get { return this is Expression_SelectFn; } }
-    public bool is_Index { get { return this is Expression_Index; } }
-    public bool is_IndexRange { get { return this is Expression_IndexRange; } }
-    public bool is_TupleSelect { get { return this is Expression_TupleSelect; } }
-    public bool is_Call { get { return this is Expression_Call; } }
-    public bool is_Lambda { get { return this is Expression_Lambda; } }
-    public bool is_BetaRedex { get { return this is Expression_BetaRedex; } }
-    public bool is_IIFE { get { return this is Expression_IIFE; } }
-    public bool is_Apply { get { return this is Expression_Apply; } }
-    public bool is_TypeTest { get { return this is Expression_TypeTest; } }
-    public bool is_InitializationValue { get { return this is Expression_InitializationValue; } }
-    public bool is_BoolBoundedPool { get { return this is Expression_BoolBoundedPool; } }
-    public bool is_SetBoundedPool { get { return this is Expression_SetBoundedPool; } }
-    public bool is_SeqBoundedPool { get { return this is Expression_SeqBoundedPool; } }
-    public bool is_IntRange { get { return this is Expression_IntRange; } }
-    public DAST._ILiteral dtor_Literal_a0 {
-      get {
-        var d = this;
-        return ((Expression_Literal)d)._a0;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> dtor_Ident_a0 {
-      get {
-        var d = this;
-        return ((Expression_Ident)d)._a0;
-      }
-    }
-    public Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_Companion_a0 {
-      get {
-        var d = this;
-        return ((Expression_Companion)d)._a0;
-      }
-    }
-    public Dafny.ISequence<DAST._IExpression> dtor_Tuple_a0 {
-      get {
-        var d = this;
-        return ((Expression_Tuple)d)._a0;
-      }
-    }
-    public Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_path {
-      get {
-        var d = this;
-        if (d is Expression_New) { return ((Expression_New)d)._path; }
-        return ((Expression_DatatypeValue)d)._path;
-      }
-    }
-    public Dafny.ISequence<DAST._IType> dtor_typeArgs {
-      get {
-        var d = this;
-        if (d is Expression_New) { return ((Expression_New)d)._typeArgs; }
-        if (d is Expression_DatatypeValue) { return ((Expression_DatatypeValue)d)._typeArgs; }
-        return ((Expression_Call)d)._typeArgs;
-      }
-    }
-    public Dafny.ISequence<DAST._IExpression> dtor_args {
-      get {
-        var d = this;
-        if (d is Expression_New) { return ((Expression_New)d)._args; }
-        if (d is Expression_Call) { return ((Expression_Call)d)._args; }
-        return ((Expression_Apply)d)._args;
-      }
-    }
-    public Dafny.ISequence<DAST._IExpression> dtor_dims {
-      get {
-        var d = this;
-        return ((Expression_NewArray)d)._dims;
-      }
-    }
-    public DAST._IType dtor_typ {
-      get {
-        var d = this;
-        if (d is Expression_NewArray) { return ((Expression_NewArray)d)._typ; }
-        if (d is Expression_Convert) { return ((Expression_Convert)d)._typ; }
-        if (d is Expression_SeqValue) { return ((Expression_SeqValue)d)._typ; }
-        if (d is Expression_IIFE) { return ((Expression_IIFE)d)._typ; }
-        return ((Expression_InitializationValue)d)._typ;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> dtor_variant {
-      get {
-        var d = this;
-        if (d is Expression_DatatypeValue) { return ((Expression_DatatypeValue)d)._variant; }
-        return ((Expression_TypeTest)d)._variant;
-      }
-    }
-    public bool dtor_isCo {
-      get {
-        var d = this;
-        return ((Expression_DatatypeValue)d)._isCo;
-      }
-    }
-    public Dafny.ISequence<_System._ITuple2<Dafny.ISequence<Dafny.Rune>, DAST._IExpression>> dtor_contents {
-      get {
-        var d = this;
-        return ((Expression_DatatypeValue)d)._contents;
-      }
-    }
-    public DAST._IExpression dtor_value {
-      get {
-        var d = this;
-        if (d is Expression_Convert) { return ((Expression_Convert)d)._value; }
-        return ((Expression_IIFE)d)._value;
-      }
-    }
-    public DAST._IType dtor_from {
-      get {
-        var d = this;
-        return ((Expression_Convert)d)._from;
-      }
-    }
-    public DAST._IExpression dtor_length {
-      get {
-        var d = this;
-        return ((Expression_SeqConstruct)d)._length;
-      }
-    }
-    public DAST._IExpression dtor_elem {
-      get {
-        var d = this;
-        return ((Expression_SeqConstruct)d)._elem;
-      }
-    }
-    public Dafny.ISequence<DAST._IExpression> dtor_elements {
-      get {
-        var d = this;
-        if (d is Expression_SeqValue) { return ((Expression_SeqValue)d)._elements; }
-        return ((Expression_SetValue)d)._elements;
-      }
-    }
-    public Dafny.ISequence<_System._ITuple2<DAST._IExpression, DAST._IExpression>> dtor_mapElems {
-      get {
-        var d = this;
-        return ((Expression_MapValue)d)._mapElems;
-      }
-    }
-    public DAST._IExpression dtor_cond {
-      get {
-        var d = this;
-        return ((Expression_Ite)d)._cond;
-      }
-    }
-    public DAST._IExpression dtor_thn {
-      get {
-        var d = this;
-        return ((Expression_Ite)d)._thn;
-      }
-    }
-    public DAST._IExpression dtor_els {
-      get {
-        var d = this;
-        return ((Expression_Ite)d)._els;
-      }
-    }
-    public DAST._IUnaryOp dtor_unOp {
-      get {
-        var d = this;
-        return ((Expression_UnOp)d)._unOp;
-      }
-    }
-    public DAST._IExpression dtor_expr {
-      get {
-        var d = this;
-        if (d is Expression_UnOp) { return ((Expression_UnOp)d)._expr; }
-        if (d is Expression_ArrayLen) { return ((Expression_ArrayLen)d)._expr; }
-        if (d is Expression_Select) { return ((Expression_Select)d)._expr; }
-        if (d is Expression_SelectFn) { return ((Expression_SelectFn)d)._expr; }
-        if (d is Expression_Index) { return ((Expression_Index)d)._expr; }
-        if (d is Expression_IndexRange) { return ((Expression_IndexRange)d)._expr; }
-        if (d is Expression_TupleSelect) { return ((Expression_TupleSelect)d)._expr; }
-        if (d is Expression_BetaRedex) { return ((Expression_BetaRedex)d)._expr; }
-        return ((Expression_Apply)d)._expr;
-      }
-    }
-    public DAST._IBinOp dtor_op {
-      get {
-        var d = this;
-        return ((Expression_BinOp)d)._op;
-      }
-    }
-    public DAST._IExpression dtor_left {
-      get {
-        var d = this;
-        return ((Expression_BinOp)d)._left;
-      }
-    }
-    public DAST._IExpression dtor_right {
-      get {
-        var d = this;
-        return ((Expression_BinOp)d)._right;
-      }
-    }
-    public BigInteger dtor_dim {
-      get {
-        var d = this;
-        return ((Expression_ArrayLen)d)._dim;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> dtor_field {
-      get {
-        var d = this;
-        if (d is Expression_Select) { return ((Expression_Select)d)._field; }
-        return ((Expression_SelectFn)d)._field;
-      }
-    }
-    public bool dtor_isConstant {
-      get {
-        var d = this;
-        return ((Expression_Select)d)._isConstant;
-      }
-    }
-    public bool dtor_onDatatype {
-      get {
-        var d = this;
-        if (d is Expression_Select) { return ((Expression_Select)d)._onDatatype; }
-        return ((Expression_SelectFn)d)._onDatatype;
-      }
-    }
-    public bool dtor_isStatic {
-      get {
-        var d = this;
-        return ((Expression_SelectFn)d)._isStatic;
-      }
-    }
-    public BigInteger dtor_arity {
-      get {
-        var d = this;
-        return ((Expression_SelectFn)d)._arity;
-      }
-    }
-    public DAST._ICollKind dtor_collKind {
-      get {
-        var d = this;
-        return ((Expression_Index)d)._collKind;
-      }
-    }
-    public Dafny.ISequence<DAST._IExpression> dtor_indices {
-      get {
-        var d = this;
-        return ((Expression_Index)d)._indices;
-      }
-    }
-    public bool dtor_isArray {
-      get {
-        var d = this;
-        return ((Expression_IndexRange)d)._isArray;
-      }
-    }
-    public Std.Wrappers._IOption<DAST._IExpression> dtor_low {
-      get {
-        var d = this;
-        return ((Expression_IndexRange)d)._low;
-      }
-    }
-    public Std.Wrappers._IOption<DAST._IExpression> dtor_high {
-      get {
-        var d = this;
-        return ((Expression_IndexRange)d)._high;
-      }
-    }
-    public BigInteger dtor_index {
-      get {
-        var d = this;
-        return ((Expression_TupleSelect)d)._index;
-      }
-    }
-    public DAST._IExpression dtor_on {
-      get {
-        var d = this;
-        if (d is Expression_Call) { return ((Expression_Call)d)._on; }
-        return ((Expression_TypeTest)d)._on;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> dtor_name {
-      get {
-        var d = this;
-        if (d is Expression_Call) { return ((Expression_Call)d)._name; }
-        return ((Expression_IIFE)d)._name;
-      }
-    }
-    public Dafny.ISequence<DAST._IFormal> dtor_params {
-      get {
-        var d = this;
-        return ((Expression_Lambda)d)._params;
-      }
-    }
-    public DAST._IType dtor_retType {
-      get {
-        var d = this;
-        if (d is Expression_Lambda) { return ((Expression_Lambda)d)._retType; }
-        return ((Expression_BetaRedex)d)._retType;
-      }
-    }
-    public Dafny.ISequence<DAST._IStatement> dtor_body {
-      get {
-        var d = this;
-        return ((Expression_Lambda)d)._body;
-      }
-    }
-    public Dafny.ISequence<_System._ITuple2<DAST._IFormal, DAST._IExpression>> dtor_values {
-      get {
-        var d = this;
-        return ((Expression_BetaRedex)d)._values;
-      }
-    }
-    public DAST._IExpression dtor_iifeBody {
-      get {
-        var d = this;
-        return ((Expression_IIFE)d)._iifeBody;
-      }
-    }
-    public Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_dType {
-      get {
-        var d = this;
-        return ((Expression_TypeTest)d)._dType;
-      }
-    }
-    public DAST._IExpression dtor_of {
-      get {
-        var d = this;
-        if (d is Expression_SetBoundedPool) { return ((Expression_SetBoundedPool)d)._of; }
-        return ((Expression_SeqBoundedPool)d)._of;
-      }
-    }
-    public bool dtor_includeDuplicates {
-      get {
-        var d = this;
-        return ((Expression_SeqBoundedPool)d)._includeDuplicates;
-      }
-    }
-    public DAST._IExpression dtor_lo {
-      get {
-        var d = this;
-        return ((Expression_IntRange)d)._lo;
-      }
-    }
-    public DAST._IExpression dtor_hi {
-      get {
-        var d = this;
-        return ((Expression_IntRange)d)._hi;
-      }
-    }
-    public abstract _IExpression DowncastClone();
-  }
-  public class Expression_Literal : Expression {
-    public readonly DAST._ILiteral _a0;
-    public Expression_Literal(DAST._ILiteral _a0) : base() {
-      this._a0 = _a0;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_Literal(_a0);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_Literal;
-      return oth != null && object.Equals(this._a0, oth._a0);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.Literal";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._a0);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_Ident : Expression {
-    public readonly Dafny.ISequence<Dafny.Rune> _a0;
-    public Expression_Ident(Dafny.ISequence<Dafny.Rune> _a0) : base() {
-      this._a0 = _a0;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_Ident(_a0);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_Ident;
-      return oth != null && object.Equals(this._a0, oth._a0);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 1;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.Ident";
-      s += "(";
-      s += this._a0.ToVerbatimString(true);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_Companion : Expression {
-    public readonly Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _a0;
-    public Expression_Companion(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _a0) : base() {
-      this._a0 = _a0;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_Companion(_a0);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_Companion;
-      return oth != null && object.Equals(this._a0, oth._a0);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 2;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.Companion";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._a0);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_Tuple : Expression {
-    public readonly Dafny.ISequence<DAST._IExpression> _a0;
-    public Expression_Tuple(Dafny.ISequence<DAST._IExpression> _a0) : base() {
-      this._a0 = _a0;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_Tuple(_a0);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_Tuple;
-      return oth != null && object.Equals(this._a0, oth._a0);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 3;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.Tuple";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._a0);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_New : Expression {
-    public readonly Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _path;
-    public readonly Dafny.ISequence<DAST._IType> _typeArgs;
-    public readonly Dafny.ISequence<DAST._IExpression> _args;
-    public Expression_New(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> path, Dafny.ISequence<DAST._IType> typeArgs, Dafny.ISequence<DAST._IExpression> args) : base() {
-      this._path = path;
-      this._typeArgs = typeArgs;
-      this._args = args;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_New(_path, _typeArgs, _args);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_New;
-      return oth != null && object.Equals(this._path, oth._path) && object.Equals(this._typeArgs, oth._typeArgs) && object.Equals(this._args, oth._args);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 4;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._path));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeArgs));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._args));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.New";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._path);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._typeArgs);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._args);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_NewArray : Expression {
-    public readonly Dafny.ISequence<DAST._IExpression> _dims;
-    public readonly DAST._IType _typ;
-    public Expression_NewArray(Dafny.ISequence<DAST._IExpression> dims, DAST._IType typ) : base() {
-      this._dims = dims;
-      this._typ = typ;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_NewArray(_dims, _typ);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_NewArray;
-      return oth != null && object.Equals(this._dims, oth._dims) && object.Equals(this._typ, oth._typ);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 5;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._dims));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typ));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.NewArray";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._dims);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._typ);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_DatatypeValue : Expression {
-    public readonly Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _path;
-    public readonly Dafny.ISequence<DAST._IType> _typeArgs;
-    public readonly Dafny.ISequence<Dafny.Rune> _variant;
-    public readonly bool _isCo;
-    public readonly Dafny.ISequence<_System._ITuple2<Dafny.ISequence<Dafny.Rune>, DAST._IExpression>> _contents;
-    public Expression_DatatypeValue(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> path, Dafny.ISequence<DAST._IType> typeArgs, Dafny.ISequence<Dafny.Rune> variant, bool isCo, Dafny.ISequence<_System._ITuple2<Dafny.ISequence<Dafny.Rune>, DAST._IExpression>> contents) : base() {
-      this._path = path;
-      this._typeArgs = typeArgs;
-      this._variant = variant;
-      this._isCo = isCo;
-      this._contents = contents;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_DatatypeValue(_path, _typeArgs, _variant, _isCo, _contents);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_DatatypeValue;
-      return oth != null && object.Equals(this._path, oth._path) && object.Equals(this._typeArgs, oth._typeArgs) && object.Equals(this._variant, oth._variant) && this._isCo == oth._isCo && object.Equals(this._contents, oth._contents);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 6;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._path));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeArgs));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._variant));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._isCo));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._contents));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.DatatypeValue";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._path);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._typeArgs);
-      s += ", ";
-      s += this._variant.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._isCo);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._contents);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_Convert : Expression {
-    public readonly DAST._IExpression _value;
-    public readonly DAST._IType _from;
-    public readonly DAST._IType _typ;
-    public Expression_Convert(DAST._IExpression @value, DAST._IType @from, DAST._IType typ) : base() {
-      this._value = @value;
-      this._from = @from;
-      this._typ = typ;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_Convert(_value, _from, _typ);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_Convert;
-      return oth != null && object.Equals(this._value, oth._value) && object.Equals(this._from, oth._from) && object.Equals(this._typ, oth._typ);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 7;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._value));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._from));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typ));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.Convert";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._value);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._from);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._typ);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_SeqConstruct : Expression {
-    public readonly DAST._IExpression _length;
-    public readonly DAST._IExpression _elem;
-    public Expression_SeqConstruct(DAST._IExpression length, DAST._IExpression elem) : base() {
-      this._length = length;
-      this._elem = elem;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_SeqConstruct(_length, _elem);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_SeqConstruct;
-      return oth != null && object.Equals(this._length, oth._length) && object.Equals(this._elem, oth._elem);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 8;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._length));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._elem));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.SeqConstruct";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._length);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._elem);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_SeqValue : Expression {
-    public readonly Dafny.ISequence<DAST._IExpression> _elements;
-    public readonly DAST._IType _typ;
-    public Expression_SeqValue(Dafny.ISequence<DAST._IExpression> elements, DAST._IType typ) : base() {
-      this._elements = elements;
-      this._typ = typ;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_SeqValue(_elements, _typ);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_SeqValue;
-      return oth != null && object.Equals(this._elements, oth._elements) && object.Equals(this._typ, oth._typ);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 9;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._elements));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typ));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.SeqValue";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._elements);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._typ);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_SetValue : Expression {
-    public readonly Dafny.ISequence<DAST._IExpression> _elements;
-    public Expression_SetValue(Dafny.ISequence<DAST._IExpression> elements) : base() {
-      this._elements = elements;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_SetValue(_elements);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_SetValue;
-      return oth != null && object.Equals(this._elements, oth._elements);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 10;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._elements));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.SetValue";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._elements);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_MapValue : Expression {
-    public readonly Dafny.ISequence<_System._ITuple2<DAST._IExpression, DAST._IExpression>> _mapElems;
-    public Expression_MapValue(Dafny.ISequence<_System._ITuple2<DAST._IExpression, DAST._IExpression>> mapElems) : base() {
-      this._mapElems = mapElems;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_MapValue(_mapElems);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_MapValue;
-      return oth != null && object.Equals(this._mapElems, oth._mapElems);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 11;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._mapElems));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.MapValue";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._mapElems);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_This : Expression {
-    public Expression_This() : base() {
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_This();
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_This;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 12;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.This";
-      return s;
-    }
-  }
-  public class Expression_Ite : Expression {
-    public readonly DAST._IExpression _cond;
-    public readonly DAST._IExpression _thn;
-    public readonly DAST._IExpression _els;
-    public Expression_Ite(DAST._IExpression cond, DAST._IExpression thn, DAST._IExpression els) : base() {
-      this._cond = cond;
-      this._thn = thn;
-      this._els = els;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_Ite(_cond, _thn, _els);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_Ite;
-      return oth != null && object.Equals(this._cond, oth._cond) && object.Equals(this._thn, oth._thn) && object.Equals(this._els, oth._els);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 13;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._cond));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._thn));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._els));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.Ite";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._cond);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._thn);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._els);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_UnOp : Expression {
-    public readonly DAST._IUnaryOp _unOp;
-    public readonly DAST._IExpression _expr;
-    public Expression_UnOp(DAST._IUnaryOp unOp, DAST._IExpression expr) : base() {
-      this._unOp = unOp;
-      this._expr = expr;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_UnOp(_unOp, _expr);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_UnOp;
-      return oth != null && object.Equals(this._unOp, oth._unOp) && object.Equals(this._expr, oth._expr);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 14;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._unOp));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.UnOp";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._unOp);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._expr);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_BinOp : Expression {
-    public readonly DAST._IBinOp _op;
-    public readonly DAST._IExpression _left;
-    public readonly DAST._IExpression _right;
-    public Expression_BinOp(DAST._IBinOp op, DAST._IExpression left, DAST._IExpression right) : base() {
-      this._op = op;
-      this._left = left;
-      this._right = right;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_BinOp(_op, _left, _right);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_BinOp;
-      return oth != null && object.Equals(this._op, oth._op) && object.Equals(this._left, oth._left) && object.Equals(this._right, oth._right);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 15;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._op));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._left));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._right));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.BinOp";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._op);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._left);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._right);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_ArrayLen : Expression {
-    public readonly DAST._IExpression _expr;
-    public readonly BigInteger _dim;
-    public Expression_ArrayLen(DAST._IExpression expr, BigInteger dim) : base() {
-      this._expr = expr;
-      this._dim = dim;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_ArrayLen(_expr, _dim);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_ArrayLen;
-      return oth != null && object.Equals(this._expr, oth._expr) && this._dim == oth._dim;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 16;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._dim));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.ArrayLen";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._expr);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._dim);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_Select : Expression {
-    public readonly DAST._IExpression _expr;
-    public readonly Dafny.ISequence<Dafny.Rune> _field;
-    public readonly bool _isConstant;
-    public readonly bool _onDatatype;
-    public Expression_Select(DAST._IExpression expr, Dafny.ISequence<Dafny.Rune> field, bool isConstant, bool onDatatype) : base() {
-      this._expr = expr;
-      this._field = field;
-      this._isConstant = isConstant;
-      this._onDatatype = onDatatype;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_Select(_expr, _field, _isConstant, _onDatatype);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_Select;
-      return oth != null && object.Equals(this._expr, oth._expr) && object.Equals(this._field, oth._field) && this._isConstant == oth._isConstant && this._onDatatype == oth._onDatatype;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 17;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._field));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._isConstant));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._onDatatype));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.Select";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._expr);
-      s += ", ";
-      s += this._field.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._isConstant);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._onDatatype);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_SelectFn : Expression {
-    public readonly DAST._IExpression _expr;
-    public readonly Dafny.ISequence<Dafny.Rune> _field;
-    public readonly bool _onDatatype;
-    public readonly bool _isStatic;
-    public readonly BigInteger _arity;
-    public Expression_SelectFn(DAST._IExpression expr, Dafny.ISequence<Dafny.Rune> field, bool onDatatype, bool isStatic, BigInteger arity) : base() {
-      this._expr = expr;
-      this._field = field;
-      this._onDatatype = onDatatype;
-      this._isStatic = isStatic;
-      this._arity = arity;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_SelectFn(_expr, _field, _onDatatype, _isStatic, _arity);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_SelectFn;
-      return oth != null && object.Equals(this._expr, oth._expr) && object.Equals(this._field, oth._field) && this._onDatatype == oth._onDatatype && this._isStatic == oth._isStatic && this._arity == oth._arity;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 18;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._field));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._onDatatype));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._isStatic));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._arity));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.SelectFn";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._expr);
-      s += ", ";
-      s += this._field.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._onDatatype);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._isStatic);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._arity);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_Index : Expression {
-    public readonly DAST._IExpression _expr;
-    public readonly DAST._ICollKind _collKind;
-    public readonly Dafny.ISequence<DAST._IExpression> _indices;
-    public Expression_Index(DAST._IExpression expr, DAST._ICollKind collKind, Dafny.ISequence<DAST._IExpression> indices) : base() {
-      this._expr = expr;
-      this._collKind = collKind;
-      this._indices = indices;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_Index(_expr, _collKind, _indices);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_Index;
-      return oth != null && object.Equals(this._expr, oth._expr) && object.Equals(this._collKind, oth._collKind) && object.Equals(this._indices, oth._indices);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 19;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._collKind));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._indices));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.Index";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._expr);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._collKind);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._indices);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_IndexRange : Expression {
-    public readonly DAST._IExpression _expr;
-    public readonly bool _isArray;
-    public readonly Std.Wrappers._IOption<DAST._IExpression> _low;
-    public readonly Std.Wrappers._IOption<DAST._IExpression> _high;
-    public Expression_IndexRange(DAST._IExpression expr, bool isArray, Std.Wrappers._IOption<DAST._IExpression> low, Std.Wrappers._IOption<DAST._IExpression> high) : base() {
-      this._expr = expr;
-      this._isArray = isArray;
-      this._low = low;
-      this._high = high;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_IndexRange(_expr, _isArray, _low, _high);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_IndexRange;
-      return oth != null && object.Equals(this._expr, oth._expr) && this._isArray == oth._isArray && object.Equals(this._low, oth._low) && object.Equals(this._high, oth._high);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 20;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._isArray));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._low));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._high));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.IndexRange";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._expr);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._isArray);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._low);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._high);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_TupleSelect : Expression {
-    public readonly DAST._IExpression _expr;
-    public readonly BigInteger _index;
-    public Expression_TupleSelect(DAST._IExpression expr, BigInteger index) : base() {
-      this._expr = expr;
-      this._index = index;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_TupleSelect(_expr, _index);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_TupleSelect;
-      return oth != null && object.Equals(this._expr, oth._expr) && this._index == oth._index;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 21;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._index));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.TupleSelect";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._expr);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._index);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_Call : Expression {
-    public readonly DAST._IExpression _on;
-    public readonly Dafny.ISequence<Dafny.Rune> _name;
-    public readonly Dafny.ISequence<DAST._IType> _typeArgs;
-    public readonly Dafny.ISequence<DAST._IExpression> _args;
-    public Expression_Call(DAST._IExpression @on, Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IType> typeArgs, Dafny.ISequence<DAST._IExpression> args) : base() {
-      this._on = @on;
-      this._name = name;
-      this._typeArgs = typeArgs;
-      this._args = args;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_Call(_on, _name, _typeArgs, _args);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_Call;
-      return oth != null && object.Equals(this._on, oth._on) && object.Equals(this._name, oth._name) && object.Equals(this._typeArgs, oth._typeArgs) && object.Equals(this._args, oth._args);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 22;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._on));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeArgs));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._args));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.Call";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._on);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._name);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._typeArgs);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._args);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_Lambda : Expression {
-    public readonly Dafny.ISequence<DAST._IFormal> _params;
-    public readonly DAST._IType _retType;
-    public readonly Dafny.ISequence<DAST._IStatement> _body;
-    public Expression_Lambda(Dafny.ISequence<DAST._IFormal> @params, DAST._IType retType, Dafny.ISequence<DAST._IStatement> body) : base() {
-      this._params = @params;
-      this._retType = retType;
-      this._body = body;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_Lambda(_params, _retType, _body);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_Lambda;
-      return oth != null && object.Equals(this._params, oth._params) && object.Equals(this._retType, oth._retType) && object.Equals(this._body, oth._body);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 23;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._params));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._retType));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.Lambda";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._params);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._retType);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._body);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_BetaRedex : Expression {
-    public readonly Dafny.ISequence<_System._ITuple2<DAST._IFormal, DAST._IExpression>> _values;
-    public readonly DAST._IType _retType;
-    public readonly DAST._IExpression _expr;
-    public Expression_BetaRedex(Dafny.ISequence<_System._ITuple2<DAST._IFormal, DAST._IExpression>> values, DAST._IType retType, DAST._IExpression expr) : base() {
-      this._values = values;
-      this._retType = retType;
-      this._expr = expr;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_BetaRedex(_values, _retType, _expr);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_BetaRedex;
-      return oth != null && object.Equals(this._values, oth._values) && object.Equals(this._retType, oth._retType) && object.Equals(this._expr, oth._expr);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 24;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._values));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._retType));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.BetaRedex";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._values);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._retType);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._expr);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_IIFE : Expression {
-    public readonly Dafny.ISequence<Dafny.Rune> _name;
-    public readonly DAST._IType _typ;
-    public readonly DAST._IExpression _value;
-    public readonly DAST._IExpression _iifeBody;
-    public Expression_IIFE(Dafny.ISequence<Dafny.Rune> name, DAST._IType typ, DAST._IExpression @value, DAST._IExpression iifeBody) : base() {
-      this._name = name;
-      this._typ = typ;
-      this._value = @value;
-      this._iifeBody = iifeBody;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_IIFE(_name, _typ, _value, _iifeBody);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_IIFE;
-      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._typ, oth._typ) && object.Equals(this._value, oth._value) && object.Equals(this._iifeBody, oth._iifeBody);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 25;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typ));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._value));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._iifeBody));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.IIFE";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._name);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._typ);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._value);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._iifeBody);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_Apply : Expression {
-    public readonly DAST._IExpression _expr;
-    public readonly Dafny.ISequence<DAST._IExpression> _args;
-    public Expression_Apply(DAST._IExpression expr, Dafny.ISequence<DAST._IExpression> args) : base() {
-      this._expr = expr;
-      this._args = args;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_Apply(_expr, _args);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_Apply;
-      return oth != null && object.Equals(this._expr, oth._expr) && object.Equals(this._args, oth._args);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 26;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._args));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.Apply";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._expr);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._args);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_TypeTest : Expression {
-    public readonly DAST._IExpression _on;
-    public readonly Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _dType;
-    public readonly Dafny.ISequence<Dafny.Rune> _variant;
-    public Expression_TypeTest(DAST._IExpression @on, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dType, Dafny.ISequence<Dafny.Rune> variant) : base() {
-      this._on = @on;
-      this._dType = dType;
-      this._variant = variant;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_TypeTest(_on, _dType, _variant);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_TypeTest;
-      return oth != null && object.Equals(this._on, oth._on) && object.Equals(this._dType, oth._dType) && object.Equals(this._variant, oth._variant);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 27;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._on));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._dType));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._variant));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.TypeTest";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._on);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._dType);
-      s += ", ";
-      s += this._variant.ToVerbatimString(true);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_InitializationValue : Expression {
-    public readonly DAST._IType _typ;
-    public Expression_InitializationValue(DAST._IType typ) : base() {
-      this._typ = typ;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_InitializationValue(_typ);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_InitializationValue;
-      return oth != null && object.Equals(this._typ, oth._typ);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 28;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typ));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.InitializationValue";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._typ);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_BoolBoundedPool : Expression {
-    public Expression_BoolBoundedPool() : base() {
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_BoolBoundedPool();
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_BoolBoundedPool;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 29;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.BoolBoundedPool";
-      return s;
-    }
-  }
-  public class Expression_SetBoundedPool : Expression {
-    public readonly DAST._IExpression _of;
-    public Expression_SetBoundedPool(DAST._IExpression of) : base() {
-      this._of = of;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_SetBoundedPool(_of);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_SetBoundedPool;
-      return oth != null && object.Equals(this._of, oth._of);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 30;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._of));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.SetBoundedPool";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._of);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_SeqBoundedPool : Expression {
-    public readonly DAST._IExpression _of;
-    public readonly bool _includeDuplicates;
-    public Expression_SeqBoundedPool(DAST._IExpression of, bool includeDuplicates) : base() {
-      this._of = of;
-      this._includeDuplicates = includeDuplicates;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_SeqBoundedPool(_of, _includeDuplicates);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_SeqBoundedPool;
-      return oth != null && object.Equals(this._of, oth._of) && this._includeDuplicates == oth._includeDuplicates;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 31;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._of));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._includeDuplicates));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.SeqBoundedPool";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._of);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._includeDuplicates);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expression_IntRange : Expression {
-    public readonly DAST._IExpression _lo;
-    public readonly DAST._IExpression _hi;
-    public Expression_IntRange(DAST._IExpression lo, DAST._IExpression hi) : base() {
-      this._lo = lo;
-      this._hi = hi;
-    }
-    public override _IExpression DowncastClone() {
-      if (this is _IExpression dt) { return dt; }
-      return new Expression_IntRange(_lo, _hi);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Expression_IntRange;
-      return oth != null && object.Equals(this._lo, oth._lo) && object.Equals(this._hi, oth._hi);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 32;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._lo));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._hi));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Expression.IntRange";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._lo);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._hi);
-      s += ")";
-      return s;
-    }
-  }
-
-  public interface _IUnaryOp {
-    bool is_Not { get; }
-    bool is_BitwiseNot { get; }
-    bool is_Cardinality { get; }
-    _IUnaryOp DowncastClone();
-  }
-  public abstract class UnaryOp : _IUnaryOp {
-    public UnaryOp() {
-    }
-    private static readonly DAST._IUnaryOp theDefault = create_Not();
-    public static DAST._IUnaryOp Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<DAST._IUnaryOp> _TYPE = new Dafny.TypeDescriptor<DAST._IUnaryOp>(DAST.UnaryOp.Default());
-    public static Dafny.TypeDescriptor<DAST._IUnaryOp> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IUnaryOp create_Not() {
-      return new UnaryOp_Not();
-    }
-    public static _IUnaryOp create_BitwiseNot() {
-      return new UnaryOp_BitwiseNot();
-    }
-    public static _IUnaryOp create_Cardinality() {
-      return new UnaryOp_Cardinality();
-    }
-    public bool is_Not { get { return this is UnaryOp_Not; } }
-    public bool is_BitwiseNot { get { return this is UnaryOp_BitwiseNot; } }
-    public bool is_Cardinality { get { return this is UnaryOp_Cardinality; } }
-    public static System.Collections.Generic.IEnumerable<_IUnaryOp> AllSingletonConstructors {
-      get {
-        yield return UnaryOp.create_Not();
-        yield return UnaryOp.create_BitwiseNot();
-        yield return UnaryOp.create_Cardinality();
-      }
-    }
-    public abstract _IUnaryOp DowncastClone();
-  }
-  public class UnaryOp_Not : UnaryOp {
-    public UnaryOp_Not() : base() {
-    }
-    public override _IUnaryOp DowncastClone() {
-      if (this is _IUnaryOp dt) { return dt; }
-      return new UnaryOp_Not();
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.UnaryOp_Not;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.UnaryOp.Not";
-      return s;
-    }
-  }
-  public class UnaryOp_BitwiseNot : UnaryOp {
-    public UnaryOp_BitwiseNot() : base() {
-    }
-    public override _IUnaryOp DowncastClone() {
-      if (this is _IUnaryOp dt) { return dt; }
-      return new UnaryOp_BitwiseNot();
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.UnaryOp_BitwiseNot;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 1;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.UnaryOp.BitwiseNot";
-      return s;
-    }
-  }
-  public class UnaryOp_Cardinality : UnaryOp {
-    public UnaryOp_Cardinality() : base() {
-    }
-    public override _IUnaryOp DowncastClone() {
-      if (this is _IUnaryOp dt) { return dt; }
-      return new UnaryOp_Cardinality();
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.UnaryOp_Cardinality;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 2;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.UnaryOp.Cardinality";
-      return s;
-    }
-  }
-
-  public interface _ILiteral {
-    bool is_BoolLiteral { get; }
-    bool is_IntLiteral { get; }
-    bool is_DecLiteral { get; }
-    bool is_StringLiteral { get; }
-    bool is_CharLiteral { get; }
-    bool is_Null { get; }
-    bool dtor_BoolLiteral_a0 { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_IntLiteral_a0 { get; }
-    DAST._IType dtor_IntLiteral_a1 { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_DecLiteral_a0 { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_DecLiteral_a1 { get; }
-    DAST._IType dtor_DecLiteral_a2 { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_StringLiteral_a0 { get; }
-    Dafny.Rune dtor_CharLiteral_a0 { get; }
-    DAST._IType dtor_Null_a0 { get; }
-    _ILiteral DowncastClone();
-  }
-  public abstract class Literal : _ILiteral {
-    public Literal() {
-    }
-    private static readonly DAST._ILiteral theDefault = create_BoolLiteral(false);
-    public static DAST._ILiteral Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<DAST._ILiteral> _TYPE = new Dafny.TypeDescriptor<DAST._ILiteral>(DAST.Literal.Default());
-    public static Dafny.TypeDescriptor<DAST._ILiteral> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _ILiteral create_BoolLiteral(bool _a0) {
-      return new Literal_BoolLiteral(_a0);
-    }
-    public static _ILiteral create_IntLiteral(Dafny.ISequence<Dafny.Rune> _a0, DAST._IType _a1) {
-      return new Literal_IntLiteral(_a0, _a1);
-    }
-    public static _ILiteral create_DecLiteral(Dafny.ISequence<Dafny.Rune> _a0, Dafny.ISequence<Dafny.Rune> _a1, DAST._IType _a2) {
-      return new Literal_DecLiteral(_a0, _a1, _a2);
-    }
-    public static _ILiteral create_StringLiteral(Dafny.ISequence<Dafny.Rune> _a0) {
-      return new Literal_StringLiteral(_a0);
-    }
-    public static _ILiteral create_CharLiteral(Dafny.Rune _a0) {
-      return new Literal_CharLiteral(_a0);
-    }
-    public static _ILiteral create_Null(DAST._IType _a0) {
-      return new Literal_Null(_a0);
-    }
-    public bool is_BoolLiteral { get { return this is Literal_BoolLiteral; } }
-    public bool is_IntLiteral { get { return this is Literal_IntLiteral; } }
-    public bool is_DecLiteral { get { return this is Literal_DecLiteral; } }
-    public bool is_StringLiteral { get { return this is Literal_StringLiteral; } }
-    public bool is_CharLiteral { get { return this is Literal_CharLiteral; } }
-    public bool is_Null { get { return this is Literal_Null; } }
-    public bool dtor_BoolLiteral_a0 {
-      get {
-        var d = this;
-        return ((Literal_BoolLiteral)d)._a0;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> dtor_IntLiteral_a0 {
-      get {
-        var d = this;
-        return ((Literal_IntLiteral)d)._a0;
-      }
-    }
-    public DAST._IType dtor_IntLiteral_a1 {
-      get {
-        var d = this;
-        return ((Literal_IntLiteral)d)._a1;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> dtor_DecLiteral_a0 {
-      get {
-        var d = this;
-        return ((Literal_DecLiteral)d)._a0;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> dtor_DecLiteral_a1 {
-      get {
-        var d = this;
-        return ((Literal_DecLiteral)d)._a1;
-      }
-    }
-    public DAST._IType dtor_DecLiteral_a2 {
-      get {
-        var d = this;
-        return ((Literal_DecLiteral)d)._a2;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> dtor_StringLiteral_a0 {
-      get {
-        var d = this;
-        return ((Literal_StringLiteral)d)._a0;
-      }
-    }
-    public Dafny.Rune dtor_CharLiteral_a0 {
-      get {
-        var d = this;
-        return ((Literal_CharLiteral)d)._a0;
-      }
-    }
-    public DAST._IType dtor_Null_a0 {
-      get {
-        var d = this;
-        return ((Literal_Null)d)._a0;
-      }
-    }
-    public abstract _ILiteral DowncastClone();
-  }
-  public class Literal_BoolLiteral : Literal {
-    public readonly bool _a0;
-    public Literal_BoolLiteral(bool _a0) : base() {
-      this._a0 = _a0;
-    }
-    public override _ILiteral DowncastClone() {
-      if (this is _ILiteral dt) { return dt; }
-      return new Literal_BoolLiteral(_a0);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Literal_BoolLiteral;
-      return oth != null && this._a0 == oth._a0;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Literal.BoolLiteral";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._a0);
-      s += ")";
-      return s;
-    }
-  }
-  public class Literal_IntLiteral : Literal {
-    public readonly Dafny.ISequence<Dafny.Rune> _a0;
-    public readonly DAST._IType _a1;
-    public Literal_IntLiteral(Dafny.ISequence<Dafny.Rune> _a0, DAST._IType _a1) : base() {
-      this._a0 = _a0;
-      this._a1 = _a1;
-    }
-    public override _ILiteral DowncastClone() {
-      if (this is _ILiteral dt) { return dt; }
-      return new Literal_IntLiteral(_a0, _a1);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Literal_IntLiteral;
-      return oth != null && object.Equals(this._a0, oth._a0) && object.Equals(this._a1, oth._a1);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 1;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a1));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Literal.IntLiteral";
-      s += "(";
-      s += this._a0.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._a1);
-      s += ")";
-      return s;
-    }
-  }
-  public class Literal_DecLiteral : Literal {
-    public readonly Dafny.ISequence<Dafny.Rune> _a0;
-    public readonly Dafny.ISequence<Dafny.Rune> _a1;
-    public readonly DAST._IType _a2;
-    public Literal_DecLiteral(Dafny.ISequence<Dafny.Rune> _a0, Dafny.ISequence<Dafny.Rune> _a1, DAST._IType _a2) : base() {
-      this._a0 = _a0;
-      this._a1 = _a1;
-      this._a2 = _a2;
-    }
-    public override _ILiteral DowncastClone() {
-      if (this is _ILiteral dt) { return dt; }
-      return new Literal_DecLiteral(_a0, _a1, _a2);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Literal_DecLiteral;
-      return oth != null && object.Equals(this._a0, oth._a0) && object.Equals(this._a1, oth._a1) && object.Equals(this._a2, oth._a2);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 2;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a1));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a2));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Literal.DecLiteral";
-      s += "(";
-      s += this._a0.ToVerbatimString(true);
-      s += ", ";
-      s += this._a1.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._a2);
-      s += ")";
-      return s;
-    }
-  }
-  public class Literal_StringLiteral : Literal {
-    public readonly Dafny.ISequence<Dafny.Rune> _a0;
-    public Literal_StringLiteral(Dafny.ISequence<Dafny.Rune> _a0) : base() {
-      this._a0 = _a0;
-    }
-    public override _ILiteral DowncastClone() {
-      if (this is _ILiteral dt) { return dt; }
-      return new Literal_StringLiteral(_a0);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Literal_StringLiteral;
-      return oth != null && object.Equals(this._a0, oth._a0);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 3;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Literal.StringLiteral";
-      s += "(";
-      s += this._a0.ToVerbatimString(true);
-      s += ")";
-      return s;
-    }
-  }
-  public class Literal_CharLiteral : Literal {
-    public readonly Dafny.Rune _a0;
-    public Literal_CharLiteral(Dafny.Rune _a0) : base() {
-      this._a0 = _a0;
-    }
-    public override _ILiteral DowncastClone() {
-      if (this is _ILiteral dt) { return dt; }
-      return new Literal_CharLiteral(_a0);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Literal_CharLiteral;
-      return oth != null && this._a0 == oth._a0;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 4;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Literal.CharLiteral";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._a0);
-      s += ")";
-      return s;
-    }
-  }
-  public class Literal_Null : Literal {
-    public readonly DAST._IType _a0;
-    public Literal_Null(DAST._IType _a0) : base() {
-      this._a0 = _a0;
-    }
-    public override _ILiteral DowncastClone() {
-      if (this is _ILiteral dt) { return dt; }
-      return new Literal_Null(_a0);
-    }
-    public override bool Equals(object other) {
-      var oth = other as DAST.Literal_Null;
-      return oth != null && object.Equals(this._a0, oth._a0);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 5;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "DAST.Literal.Null";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._a0);
-      s += ")";
-      return s;
-    }
-  }
-} // end of namespace DAST
-
-namespace D2DPrettyPrinter {
-
-  public partial class __default {
-    public static Dafny.ISequence<Dafny.Rune> PrettyPrint(Dafny.ISequence<DAST._IModule> d) {
-      Dafny.ISequence<Dafny.Rune> s = Dafny.Sequence<Dafny.Rune>.Empty;
-      Microsoft.Dafny.Compilers.WrapException.Throw();
-      s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Not Implemented Yet");
-      return s;
-    }
-  }
-} // end of namespace D2DPrettyPrinter
-namespace ResolvedDesugaredExecutableDafnyPlugin {
-
-
-  public partial class COMP {
-    public COMP() {
-    }
-    public static Dafny.ISequence<Dafny.Rune> Compile(Dafny.ISequence<DAST._IModule> p) {
-      Dafny.ISequence<Dafny.Rune> s = Dafny.Sequence<Dafny.Rune>.Empty;
-      Dafny.ISequence<Dafny.Rune> _out14;
-      _out14 = D2DPrettyPrinter.__default.PrettyPrint(p);
-      s = _out14;
-      return s;
-    }
-    public static Dafny.ISequence<Dafny.Rune> EmitCallToMain(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> fullName) {
-      Dafny.ISequence<Dafny.Rune> s = Dafny.Sequence<Dafny.Rune>.Empty;
-      s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-      return s;
-    }
-  }
-} // end of namespace ResolvedDesugaredExecutableDafnyPlugin
-namespace RAST {
-
-  public partial class __default {
-    public static Dafny.ISequence<Dafny.Rune> SeqToString<__T>(Dafny.ISequence<__T> s, Func<__T, Dafny.ISequence<Dafny.Rune>> f, Dafny.ISequence<Dafny.Rune> separator) {
-      if ((new BigInteger((s).Count)).Sign == 0) {
-        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-      } else {
-        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Helpers.Id<Func<__T, Dafny.ISequence<Dafny.Rune>>>(f)((s).Select(BigInteger.Zero)), (((new BigInteger((s).Count)) > (BigInteger.One)) ? (Dafny.Sequence<Dafny.Rune>.Concat(separator, RAST.__default.SeqToString<__T>((s).Drop(BigInteger.One), f, separator))) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))));
-      }
-    }
-    public static Dafny.ISequence<Dafny.Rune> AddIndent(Dafny.ISequence<Dafny.Rune> raw, Dafny.ISequence<Dafny.Rune> ind) {
-      Dafny.ISequence<Dafny.Rune> _828___accumulator = Dafny.Sequence<Dafny.Rune>.FromElements();
-    TAIL_CALL_START:;
-      if ((new BigInteger((raw).Count)).Sign == 0) {
-        return Dafny.Sequence<Dafny.Rune>.Concat(_828___accumulator, raw);
-      } else if ((Dafny.Sequence<Dafny.Rune>.UnicodeFromString("[({")).Contains((raw).Select(BigInteger.Zero))) {
-        _828___accumulator = Dafny.Sequence<Dafny.Rune>.Concat(_828___accumulator, Dafny.Sequence<Dafny.Rune>.FromElements((raw).Select(BigInteger.Zero)));
-        Dafny.ISequence<Dafny.Rune> _in103 = (raw).Drop(BigInteger.One);
-        Dafny.ISequence<Dafny.Rune> _in104 = Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND);
-        raw = _in103;
-        ind = _in104;
-        goto TAIL_CALL_START;
-      } else if (((Dafny.Sequence<Dafny.Rune>.UnicodeFromString("})]")).Contains((raw).Select(BigInteger.Zero))) && ((new BigInteger((ind).Count)) > (new BigInteger(2)))) {
-        _828___accumulator = Dafny.Sequence<Dafny.Rune>.Concat(_828___accumulator, Dafny.Sequence<Dafny.Rune>.FromElements((raw).Select(BigInteger.Zero)));
-        Dafny.ISequence<Dafny.Rune> _in105 = (raw).Drop(BigInteger.One);
-        Dafny.ISequence<Dafny.Rune> _in106 = (ind).Take((new BigInteger((ind).Count)) - (new BigInteger(2)));
-        raw = _in105;
-        ind = _in106;
-        goto TAIL_CALL_START;
-      } else if (((raw).Select(BigInteger.Zero)) == (new Dafny.Rune('\n'))) {
-        _828___accumulator = Dafny.Sequence<Dafny.Rune>.Concat(_828___accumulator, Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.FromElements((raw).Select(BigInteger.Zero)), ind));
-        Dafny.ISequence<Dafny.Rune> _in107 = (raw).Drop(BigInteger.One);
-        Dafny.ISequence<Dafny.Rune> _in108 = ind;
-        raw = _in107;
-        ind = _in108;
-        goto TAIL_CALL_START;
-      } else {
-        _828___accumulator = Dafny.Sequence<Dafny.Rune>.Concat(_828___accumulator, Dafny.Sequence<Dafny.Rune>.FromElements((raw).Select(BigInteger.Zero)));
-        Dafny.ISequence<Dafny.Rune> _in109 = (raw).Drop(BigInteger.One);
-        Dafny.ISequence<Dafny.Rune> _in110 = ind;
-        raw = _in109;
-        ind = _in110;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static byte PUB {
-      get {
-        return (byte)(1);
-      }
-    }
-    public static byte PRIV {
-      get {
-        return (byte)(0);
-      }
-    }
-    public static Dafny.ISequence<Dafny.Rune> IND {
-      get {
-        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("  ");
-      }
-    }
-  }
-
-  public interface _IMod {
-    bool is_Mod { get; }
-    bool is_ExternMod { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
-    Dafny.ISequence<RAST._IModDecl> dtor_body { get; }
-    _IMod DowncastClone();
-    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
-  }
-  public abstract class Mod : _IMod {
-    public Mod() {
-    }
-    private static readonly RAST._IMod theDefault = create_Mod(Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<RAST._IModDecl>.Empty);
-    public static RAST._IMod Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<RAST._IMod> _TYPE = new Dafny.TypeDescriptor<RAST._IMod>(RAST.Mod.Default());
-    public static Dafny.TypeDescriptor<RAST._IMod> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IMod create_Mod(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<RAST._IModDecl> body) {
-      return new Mod_Mod(name, body);
-    }
-    public static _IMod create_ExternMod(Dafny.ISequence<Dafny.Rune> name) {
-      return new Mod_ExternMod(name);
-    }
-    public bool is_Mod { get { return this is Mod_Mod; } }
-    public bool is_ExternMod { get { return this is Mod_ExternMod; } }
-    public Dafny.ISequence<Dafny.Rune> dtor_name {
-      get {
-        var d = this;
-        if (d is Mod_Mod) { return ((Mod_Mod)d)._name; }
-        return ((Mod_ExternMod)d)._name;
-      }
-    }
-    public Dafny.ISequence<RAST._IModDecl> dtor_body {
-      get {
-        var d = this;
-        return ((Mod_Mod)d)._body;
-      }
-    }
-    public abstract _IMod DowncastClone();
-    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
-      RAST._IMod _source25 = this;
-      if (_source25.is_Mod) {
-        Dafny.ISequence<Dafny.Rune> _829___mcc_h0 = _source25.dtor_name;
-        Dafny.ISequence<RAST._IModDecl> _830___mcc_h1 = _source25.dtor_body;
-        Dafny.ISequence<RAST._IModDecl> _831_body = _830___mcc_h1;
-        Dafny.ISequence<Dafny.Rune> _832_name = _829___mcc_h0;
-        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("mod "), _832_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n")), ind), RAST.__default.IND), RAST.__default.SeqToString<RAST._IModDecl>(_831_body, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._IModDecl, Dafny.ISequence<Dafny.Rune>>>>((_833_ind) => ((System.Func<RAST._IModDecl, Dafny.ISequence<Dafny.Rune>>)((_834_modDecl) => {
-          return (_834_modDecl)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_833_ind, RAST.__default.IND));
-        })))(ind), Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), ind), RAST.__default.IND))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n")), ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
-      } else {
-        Dafny.ISequence<Dafny.Rune> _835___mcc_h2 = _source25.dtor_name;
-        Dafny.ISequence<Dafny.Rune> _836_name = _835___mcc_h2;
-        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("mod "), _836_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";"));
-      }
-    }
-  }
-  public class Mod_Mod : Mod {
-    public readonly Dafny.ISequence<Dafny.Rune> _name;
-    public readonly Dafny.ISequence<RAST._IModDecl> _body;
-    public Mod_Mod(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<RAST._IModDecl> body) : base() {
-      this._name = name;
-      this._body = body;
-    }
-    public override _IMod DowncastClone() {
-      if (this is _IMod dt) { return dt; }
-      return new Mod_Mod(_name, _body);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.Mod_Mod;
-      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._body, oth._body);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.Mod.Mod";
-      s += "(";
-      s += this._name.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._body);
-      s += ")";
-      return s;
-    }
-  }
-  public class Mod_ExternMod : Mod {
-    public readonly Dafny.ISequence<Dafny.Rune> _name;
-    public Mod_ExternMod(Dafny.ISequence<Dafny.Rune> name) : base() {
-      this._name = name;
-    }
-    public override _IMod DowncastClone() {
-      if (this is _IMod dt) { return dt; }
-      return new Mod_ExternMod(_name);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.Mod_ExternMod;
-      return oth != null && object.Equals(this._name, oth._name);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 1;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.Mod.ExternMod";
-      s += "(";
-      s += this._name.ToVerbatimString(true);
-      s += ")";
-      return s;
-    }
-  }
-
-  public interface _IModDecl {
-    bool is_RawDecl { get; }
-    bool is_ModDecl { get; }
-    bool is_StructDecl { get; }
-    bool is_EnumDecl { get; }
-    bool is_ImplDecl { get; }
-    bool is_TraitDecl { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_body { get; }
-    RAST._IMod dtor_mod { get; }
-    RAST._IStruct dtor_struct { get; }
-    RAST._IEnum dtor_enum { get; }
-    RAST._IImpl dtor_impl { get; }
-    RAST._ITrait dtor_tr { get; }
-    _IModDecl DowncastClone();
-    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
-  }
-  public abstract class ModDecl : _IModDecl {
-    public ModDecl() {
-    }
-    private static readonly RAST._IModDecl theDefault = create_RawDecl(Dafny.Sequence<Dafny.Rune>.Empty);
-    public static RAST._IModDecl Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<RAST._IModDecl> _TYPE = new Dafny.TypeDescriptor<RAST._IModDecl>(RAST.ModDecl.Default());
-    public static Dafny.TypeDescriptor<RAST._IModDecl> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IModDecl create_RawDecl(Dafny.ISequence<Dafny.Rune> body) {
-      return new ModDecl_RawDecl(body);
-    }
-    public static _IModDecl create_ModDecl(RAST._IMod mod) {
-      return new ModDecl_ModDecl(mod);
-    }
-    public static _IModDecl create_StructDecl(RAST._IStruct @struct) {
-      return new ModDecl_StructDecl(@struct);
-    }
-    public static _IModDecl create_EnumDecl(RAST._IEnum @enum) {
-      return new ModDecl_EnumDecl(@enum);
-    }
-    public static _IModDecl create_ImplDecl(RAST._IImpl impl) {
-      return new ModDecl_ImplDecl(impl);
-    }
-    public static _IModDecl create_TraitDecl(RAST._ITrait tr) {
-      return new ModDecl_TraitDecl(tr);
-    }
-    public bool is_RawDecl { get { return this is ModDecl_RawDecl; } }
-    public bool is_ModDecl { get { return this is ModDecl_ModDecl; } }
-    public bool is_StructDecl { get { return this is ModDecl_StructDecl; } }
-    public bool is_EnumDecl { get { return this is ModDecl_EnumDecl; } }
-    public bool is_ImplDecl { get { return this is ModDecl_ImplDecl; } }
-    public bool is_TraitDecl { get { return this is ModDecl_TraitDecl; } }
-    public Dafny.ISequence<Dafny.Rune> dtor_body {
-      get {
-        var d = this;
-        return ((ModDecl_RawDecl)d)._body;
-      }
-    }
-    public RAST._IMod dtor_mod {
-      get {
-        var d = this;
-        return ((ModDecl_ModDecl)d)._mod;
-      }
-    }
-    public RAST._IStruct dtor_struct {
-      get {
-        var d = this;
-        return ((ModDecl_StructDecl)d)._struct;
-      }
-    }
-    public RAST._IEnum dtor_enum {
-      get {
-        var d = this;
-        return ((ModDecl_EnumDecl)d)._enum;
-      }
-    }
-    public RAST._IImpl dtor_impl {
-      get {
-        var d = this;
-        return ((ModDecl_ImplDecl)d)._impl;
-      }
-    }
-    public RAST._ITrait dtor_tr {
-      get {
-        var d = this;
-        return ((ModDecl_TraitDecl)d)._tr;
-      }
-    }
-    public abstract _IModDecl DowncastClone();
-    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
-      if ((this).is_ModDecl) {
-        return ((this).dtor_mod)._ToString(ind);
-      } else if ((this).is_StructDecl) {
-        return ((this).dtor_struct)._ToString(ind);
-      } else if ((this).is_ImplDecl) {
-        return ((this).dtor_impl)._ToString(ind);
-      } else if ((this).is_EnumDecl) {
-        return ((this).dtor_enum)._ToString(ind);
-      } else if ((this).is_TraitDecl) {
-        return ((this).dtor_tr)._ToString(ind);
-      } else {
-        return (this).dtor_body;
-      }
-    }
-  }
-  public class ModDecl_RawDecl : ModDecl {
-    public readonly Dafny.ISequence<Dafny.Rune> _body;
-    public ModDecl_RawDecl(Dafny.ISequence<Dafny.Rune> body) : base() {
-      this._body = body;
-    }
-    public override _IModDecl DowncastClone() {
-      if (this is _IModDecl dt) { return dt; }
-      return new ModDecl_RawDecl(_body);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.ModDecl_RawDecl;
-      return oth != null && object.Equals(this._body, oth._body);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.ModDecl.RawDecl";
-      s += "(";
-      s += this._body.ToVerbatimString(true);
-      s += ")";
-      return s;
-    }
-  }
-  public class ModDecl_ModDecl : ModDecl {
-    public readonly RAST._IMod _mod;
-    public ModDecl_ModDecl(RAST._IMod mod) : base() {
-      this._mod = mod;
-    }
-    public override _IModDecl DowncastClone() {
-      if (this is _IModDecl dt) { return dt; }
-      return new ModDecl_ModDecl(_mod);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.ModDecl_ModDecl;
-      return oth != null && object.Equals(this._mod, oth._mod);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 1;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._mod));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.ModDecl.ModDecl";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._mod);
-      s += ")";
-      return s;
-    }
-  }
-  public class ModDecl_StructDecl : ModDecl {
-    public readonly RAST._IStruct _struct;
-    public ModDecl_StructDecl(RAST._IStruct @struct) : base() {
-      this._struct = @struct;
-    }
-    public override _IModDecl DowncastClone() {
-      if (this is _IModDecl dt) { return dt; }
-      return new ModDecl_StructDecl(_struct);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.ModDecl_StructDecl;
-      return oth != null && object.Equals(this._struct, oth._struct);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 2;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._struct));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.ModDecl.StructDecl";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._struct);
-      s += ")";
-      return s;
-    }
-  }
-  public class ModDecl_EnumDecl : ModDecl {
-    public readonly RAST._IEnum _enum;
-    public ModDecl_EnumDecl(RAST._IEnum @enum) : base() {
-      this._enum = @enum;
-    }
-    public override _IModDecl DowncastClone() {
-      if (this is _IModDecl dt) { return dt; }
-      return new ModDecl_EnumDecl(_enum);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.ModDecl_EnumDecl;
-      return oth != null && object.Equals(this._enum, oth._enum);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 3;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._enum));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.ModDecl.EnumDecl";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._enum);
-      s += ")";
-      return s;
-    }
-  }
-  public class ModDecl_ImplDecl : ModDecl {
-    public readonly RAST._IImpl _impl;
-    public ModDecl_ImplDecl(RAST._IImpl impl) : base() {
-      this._impl = impl;
-    }
-    public override _IModDecl DowncastClone() {
-      if (this is _IModDecl dt) { return dt; }
-      return new ModDecl_ImplDecl(_impl);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.ModDecl_ImplDecl;
-      return oth != null && object.Equals(this._impl, oth._impl);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 4;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._impl));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.ModDecl.ImplDecl";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._impl);
-      s += ")";
-      return s;
-    }
-  }
-  public class ModDecl_TraitDecl : ModDecl {
-    public readonly RAST._ITrait _tr;
-    public ModDecl_TraitDecl(RAST._ITrait tr) : base() {
-      this._tr = tr;
-    }
-    public override _IModDecl DowncastClone() {
-      if (this is _IModDecl dt) { return dt; }
-      return new ModDecl_TraitDecl(_tr);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.ModDecl_TraitDecl;
-      return oth != null && object.Equals(this._tr, oth._tr);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 5;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._tr));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.ModDecl.TraitDecl";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._tr);
-      s += ")";
-      return s;
-    }
-  }
-
-  public interface _IAttribute {
-    bool is_RawAttribute { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_content { get; }
-  }
-  public class Attribute : _IAttribute {
-    public readonly Dafny.ISequence<Dafny.Rune> _content;
-    public Attribute(Dafny.ISequence<Dafny.Rune> content) {
-      this._content = content;
-    }
-    public static Dafny.ISequence<Dafny.Rune> DowncastClone(Dafny.ISequence<Dafny.Rune> _this) {
-      return _this;
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.Attribute;
-      return oth != null && object.Equals(this._content, oth._content);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._content));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.Attribute.RawAttribute";
-      s += "(";
-      s += this._content.ToVerbatimString(true);
-      s += ")";
-      return s;
-    }
-    private static readonly Dafny.ISequence<Dafny.Rune> theDefault = Dafny.Sequence<Dafny.Rune>.Empty;
-    public static Dafny.ISequence<Dafny.Rune> Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>> _TYPE = new Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>>(Dafny.Sequence<Dafny.Rune>.Empty);
-    public static Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IAttribute create(Dafny.ISequence<Dafny.Rune> content) {
-      return new Attribute(content);
-    }
-    public static _IAttribute create_RawAttribute(Dafny.ISequence<Dafny.Rune> content) {
-      return create(content);
-    }
-    public bool is_RawAttribute { get { return true; } }
-    public Dafny.ISequence<Dafny.Rune> dtor_content {
-      get {
-        return this._content;
-      }
-    }
-    public static Dafny.ISequence<Dafny.Rune> ToStringMultiple(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> attributes, Dafny.ISequence<Dafny.Rune> ind) {
-      return RAST.__default.SeqToString<Dafny.ISequence<Dafny.Rune>>(attributes, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>>>((_837_ind) => ((System.Func<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>)((_838_attribute) => {
-        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat((_838_attribute), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n")), _837_ind);
-      })))(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""));
-    }
-  }
-
-  public interface _IStruct {
-    bool is_Struct { get; }
-    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_attributes { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
-    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_typeParams { get; }
-    RAST._IFormals dtor_fields { get; }
-    _IStruct DowncastClone();
-    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
-  }
-  public class Struct : _IStruct {
-    public readonly Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _attributes;
-    public readonly Dafny.ISequence<Dafny.Rune> _name;
-    public readonly Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _typeParams;
-    public readonly RAST._IFormals _fields;
-    public Struct(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> attributes, Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> typeParams, RAST._IFormals fields) {
-      this._attributes = attributes;
-      this._name = name;
-      this._typeParams = typeParams;
-      this._fields = fields;
-    }
-    public _IStruct DowncastClone() {
-      if (this is _IStruct dt) { return dt; }
-      return new Struct(_attributes, _name, _typeParams, _fields);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.Struct;
-      return oth != null && object.Equals(this._attributes, oth._attributes) && object.Equals(this._name, oth._name) && object.Equals(this._typeParams, oth._typeParams) && object.Equals(this._fields, oth._fields);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._attributes));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeParams));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._fields));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.Struct.Struct";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._attributes);
-      s += ", ";
-      s += this._name.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._typeParams);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._fields);
-      s += ")";
-      return s;
-    }
-    private static readonly RAST._IStruct theDefault = create(Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Empty, Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Empty, RAST.Formals.Default());
-    public static RAST._IStruct Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<RAST._IStruct> _TYPE = new Dafny.TypeDescriptor<RAST._IStruct>(RAST.Struct.Default());
-    public static Dafny.TypeDescriptor<RAST._IStruct> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IStruct create(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> attributes, Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> typeParams, RAST._IFormals fields) {
-      return new Struct(attributes, name, typeParams, fields);
-    }
-    public static _IStruct create_Struct(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> attributes, Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> typeParams, RAST._IFormals fields) {
-      return create(attributes, name, typeParams, fields);
-    }
-    public bool is_Struct { get { return true; } }
-    public Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_attributes {
-      get {
-        return this._attributes;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> dtor_name {
-      get {
-        return this._name;
-      }
-    }
-    public Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_typeParams {
-      get {
-        return this._typeParams;
-      }
-    }
-    public RAST._IFormals dtor_fields {
-      get {
-        return this._fields;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
-      return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(RAST.Attribute.ToStringMultiple((this).dtor_attributes, ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("pub struct ")), (this).dtor_name), RAST.TypeParam.ToStringMultiple((this).dtor_typeParams, ind)), ((this).dtor_fields)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND), ((this).dtor_fields).is_NamedFormals)), ((((this).dtor_fields).is_NamelessFormals) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))));
-    }
-  }
-
-  public interface _IFormals {
-    bool is_NamedFormals { get; }
-    bool is_NamelessFormals { get; }
-    Dafny.ISequence<RAST._IFormal> dtor_fields { get; }
-    Dafny.ISequence<RAST._IType> dtor_types { get; }
-    _IFormals DowncastClone();
-    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind, bool newLine);
-  }
-  public abstract class Formals : _IFormals {
-    public Formals() {
-    }
-    private static readonly RAST._IFormals theDefault = create_NamedFormals(Dafny.Sequence<RAST._IFormal>.Empty);
-    public static RAST._IFormals Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<RAST._IFormals> _TYPE = new Dafny.TypeDescriptor<RAST._IFormals>(RAST.Formals.Default());
-    public static Dafny.TypeDescriptor<RAST._IFormals> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IFormals create_NamedFormals(Dafny.ISequence<RAST._IFormal> fields) {
-      return new Formals_NamedFormals(fields);
-    }
-    public static _IFormals create_NamelessFormals(Dafny.ISequence<RAST._IType> types) {
-      return new Formals_NamelessFormals(types);
-    }
-    public bool is_NamedFormals { get { return this is Formals_NamedFormals; } }
-    public bool is_NamelessFormals { get { return this is Formals_NamelessFormals; } }
-    public Dafny.ISequence<RAST._IFormal> dtor_fields {
-      get {
-        var d = this;
-        return ((Formals_NamedFormals)d)._fields;
-      }
-    }
-    public Dafny.ISequence<RAST._IType> dtor_types {
-      get {
-        var d = this;
-        return ((Formals_NamelessFormals)d)._types;
-      }
-    }
-    public abstract _IFormals DowncastClone();
-    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind, bool newLine) {
-      if ((this).is_NamedFormals) {
-        Dafny.ISequence<Dafny.Rune> _839_separator = ((newLine) ? (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(",\n"), ind), RAST.__default.IND)) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")));
-        _System._ITuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>> _let_tmp_rhs40 = (((newLine) && ((new BigInteger(((this).dtor_fields).Count)).Sign == 1)) ? (_System.Tuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>.create(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), ind), RAST.__default.IND), Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), ind))) : ((((new BigInteger(((this).dtor_fields).Count)).Sign == 1) ? (_System.Tuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" "), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" "))) : (_System.Tuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))))));
-        Dafny.ISequence<Dafny.Rune> _840_beginSpace = _let_tmp_rhs40.dtor__0;
-        Dafny.ISequence<Dafny.Rune> _841_endSpace = _let_tmp_rhs40.dtor__1;
-        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {"), _840_beginSpace), RAST.__default.SeqToString<RAST._IFormal>((this).dtor_fields, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._IFormal, Dafny.ISequence<Dafny.Rune>>>>((_842_ind) => ((System.Func<RAST._IFormal, Dafny.ISequence<Dafny.Rune>>)((_843_field) => {
-          return (_843_field)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_842_ind, RAST.__default.IND));
-        })))(ind), _839_separator)), _841_endSpace), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
-      } else {
-        Dafny.ISequence<Dafny.Rune> _844_separator = ((newLine) ? (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(",\n"), ind), RAST.__default.IND)) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")));
-        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), RAST.__default.SeqToString<RAST._IType>((this).dtor_types, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._IType, Dafny.ISequence<Dafny.Rune>>>>((_845_ind) => ((System.Func<RAST._IType, Dafny.ISequence<Dafny.Rune>>)((_846_t) => {
-          return (_846_t)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_845_ind, RAST.__default.IND));
-        })))(ind), _844_separator)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-      }
-    }
-  }
-  public class Formals_NamedFormals : Formals {
-    public readonly Dafny.ISequence<RAST._IFormal> _fields;
-    public Formals_NamedFormals(Dafny.ISequence<RAST._IFormal> fields) : base() {
-      this._fields = fields;
-    }
-    public override _IFormals DowncastClone() {
-      if (this is _IFormals dt) { return dt; }
-      return new Formals_NamedFormals(_fields);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.Formals_NamedFormals;
-      return oth != null && object.Equals(this._fields, oth._fields);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._fields));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.Formals.NamedFormals";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._fields);
-      s += ")";
-      return s;
-    }
-  }
-  public class Formals_NamelessFormals : Formals {
-    public readonly Dafny.ISequence<RAST._IType> _types;
-    public Formals_NamelessFormals(Dafny.ISequence<RAST._IType> types) : base() {
-      this._types = types;
-    }
-    public override _IFormals DowncastClone() {
-      if (this is _IFormals dt) { return dt; }
-      return new Formals_NamelessFormals(_types);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.Formals_NamelessFormals;
-      return oth != null && object.Equals(this._types, oth._types);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 1;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._types));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.Formals.NamelessFormals";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._types);
-      s += ")";
-      return s;
-    }
-  }
-
-  public interface _IEnumCase {
-    bool is_EnumCase { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
-    RAST._IFormals dtor_fields { get; }
-    _IEnumCase DowncastClone();
-    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind, bool newLine);
-  }
-  public class EnumCase : _IEnumCase {
-    public readonly Dafny.ISequence<Dafny.Rune> _name;
-    public readonly RAST._IFormals _fields;
-    public EnumCase(Dafny.ISequence<Dafny.Rune> name, RAST._IFormals fields) {
-      this._name = name;
-      this._fields = fields;
-    }
-    public _IEnumCase DowncastClone() {
-      if (this is _IEnumCase dt) { return dt; }
-      return new EnumCase(_name, _fields);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.EnumCase;
-      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._fields, oth._fields);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._fields));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.EnumCase.EnumCase";
-      s += "(";
-      s += this._name.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._fields);
-      s += ")";
-      return s;
-    }
-    private static readonly RAST._IEnumCase theDefault = create(Dafny.Sequence<Dafny.Rune>.Empty, RAST.Formals.Default());
-    public static RAST._IEnumCase Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<RAST._IEnumCase> _TYPE = new Dafny.TypeDescriptor<RAST._IEnumCase>(RAST.EnumCase.Default());
-    public static Dafny.TypeDescriptor<RAST._IEnumCase> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IEnumCase create(Dafny.ISequence<Dafny.Rune> name, RAST._IFormals fields) {
-      return new EnumCase(name, fields);
-    }
-    public static _IEnumCase create_EnumCase(Dafny.ISequence<Dafny.Rune> name, RAST._IFormals fields) {
-      return create(name, fields);
-    }
-    public bool is_EnumCase { get { return true; } }
-    public Dafny.ISequence<Dafny.Rune> dtor_name {
-      get {
-        return this._name;
-      }
-    }
-    public RAST._IFormals dtor_fields {
-      get {
-        return this._fields;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind, bool newLine) {
-      return Dafny.Sequence<Dafny.Rune>.Concat((this).dtor_name, ((this).dtor_fields)._ToString(ind, newLine));
-    }
-  }
-
-  public interface _IEnum {
-    bool is_Enum { get; }
-    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_attributes { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
-    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_typeParams { get; }
-    Dafny.ISequence<RAST._IEnumCase> dtor_variants { get; }
-    _IEnum DowncastClone();
-    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
-  }
-  public class Enum : _IEnum {
-    public readonly Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _attributes;
-    public readonly Dafny.ISequence<Dafny.Rune> _name;
-    public readonly Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _typeParams;
-    public readonly Dafny.ISequence<RAST._IEnumCase> _variants;
-    public Enum(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> attributes, Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> typeParams, Dafny.ISequence<RAST._IEnumCase> variants) {
-      this._attributes = attributes;
-      this._name = name;
-      this._typeParams = typeParams;
-      this._variants = variants;
-    }
-    public _IEnum DowncastClone() {
-      if (this is _IEnum dt) { return dt; }
-      return new Enum(_attributes, _name, _typeParams, _variants);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.Enum;
-      return oth != null && object.Equals(this._attributes, oth._attributes) && object.Equals(this._name, oth._name) && object.Equals(this._typeParams, oth._typeParams) && object.Equals(this._variants, oth._variants);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._attributes));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeParams));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._variants));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.Enum.Enum";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._attributes);
-      s += ", ";
-      s += this._name.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._typeParams);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._variants);
-      s += ")";
-      return s;
-    }
-    private static readonly RAST._IEnum theDefault = create(Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Empty, Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Empty, Dafny.Sequence<RAST._IEnumCase>.Empty);
-    public static RAST._IEnum Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<RAST._IEnum> _TYPE = new Dafny.TypeDescriptor<RAST._IEnum>(RAST.Enum.Default());
-    public static Dafny.TypeDescriptor<RAST._IEnum> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IEnum create(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> attributes, Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> typeParams, Dafny.ISequence<RAST._IEnumCase> variants) {
-      return new Enum(attributes, name, typeParams, variants);
-    }
-    public static _IEnum create_Enum(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> attributes, Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> typeParams, Dafny.ISequence<RAST._IEnumCase> variants) {
-      return create(attributes, name, typeParams, variants);
-    }
-    public bool is_Enum { get { return true; } }
-    public Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_attributes {
-      get {
-        return this._attributes;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> dtor_name {
-      get {
-        return this._name;
-      }
-    }
-    public Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_typeParams {
-      get {
-        return this._typeParams;
-      }
-    }
-    public Dafny.ISequence<RAST._IEnumCase> dtor_variants {
-      get {
-        return this._variants;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
-      return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(RAST.Attribute.ToStringMultiple((this).dtor_attributes, ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("pub enum ")), (this).dtor_name), RAST.TypeParam.ToStringMultiple((this).dtor_typeParams, ind)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {")), RAST.__default.SeqToString<RAST._IEnumCase>((this).dtor_variants, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._IEnumCase, Dafny.ISequence<Dafny.Rune>>>>((_847_ind) => ((System.Func<RAST._IEnumCase, Dafny.ISequence<Dafny.Rune>>)((_848_variant) => {
-        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), _847_ind), RAST.__default.IND), (_848_variant)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_847_ind, RAST.__default.IND), false));
-      })))(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(","))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n")), ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
-    }
-  }
-
-  public interface _ITypeParam {
-    bool is_RawTypeParam { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_content { get; }
-  }
-  public class TypeParam : _ITypeParam {
-    public readonly Dafny.ISequence<Dafny.Rune> _content;
-    public TypeParam(Dafny.ISequence<Dafny.Rune> content) {
-      this._content = content;
-    }
-    public static Dafny.ISequence<Dafny.Rune> DowncastClone(Dafny.ISequence<Dafny.Rune> _this) {
-      return _this;
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.TypeParam;
-      return oth != null && object.Equals(this._content, oth._content);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._content));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.TypeParam.RawTypeParam";
-      s += "(";
-      s += this._content.ToVerbatimString(true);
-      s += ")";
-      return s;
-    }
-    private static readonly Dafny.ISequence<Dafny.Rune> theDefault = Dafny.Sequence<Dafny.Rune>.Empty;
-    public static Dafny.ISequence<Dafny.Rune> Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>> _TYPE = new Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>>(Dafny.Sequence<Dafny.Rune>.Empty);
-    public static Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _ITypeParam create(Dafny.ISequence<Dafny.Rune> content) {
-      return new TypeParam(content);
-    }
-    public static _ITypeParam create_RawTypeParam(Dafny.ISequence<Dafny.Rune> content) {
-      return create(content);
-    }
-    public bool is_RawTypeParam { get { return true; } }
-    public Dafny.ISequence<Dafny.Rune> dtor_content {
-      get {
-        return this._content;
-      }
-    }
-    public static Dafny.ISequence<Dafny.Rune> ToStringMultiple(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> typeParams, Dafny.ISequence<Dafny.Rune> ind) {
-      if ((new BigInteger((typeParams).Count)).Sign == 0) {
-        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-      } else {
-        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), RAST.__default.SeqToString<Dafny.ISequence<Dafny.Rune>>(typeParams, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>>>((_849_ind) => ((System.Func<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>)((_850_t) => {
-          return RAST.TypeParam._ToString(_850_t, Dafny.Sequence<Dafny.Rune>.Concat(_849_ind, RAST.__default.IND));
-        })))(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(","))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">"));
-      }
-    }
-    public static Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> _this, Dafny.ISequence<Dafny.Rune> ind) {
-      return (_this);
-    }
-  }
-
-  public interface _IType {
-    bool is_Self { get; }
-    bool is_SelfOwned { get; }
-    bool is_SelfMut { get; }
-    bool is_RawType { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_content { get; }
-    _IType DowncastClone();
-    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
-  }
-  public abstract class Type : _IType {
-    public Type() {
-    }
-    private static readonly RAST._IType theDefault = create_Self();
-    public static RAST._IType Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<RAST._IType> _TYPE = new Dafny.TypeDescriptor<RAST._IType>(RAST.Type.Default());
-    public static Dafny.TypeDescriptor<RAST._IType> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IType create_Self() {
-      return new Type_Self();
-    }
-    public static _IType create_SelfOwned() {
-      return new Type_SelfOwned();
-    }
-    public static _IType create_SelfMut() {
-      return new Type_SelfMut();
-    }
-    public static _IType create_RawType(Dafny.ISequence<Dafny.Rune> content) {
-      return new Type_RawType(content);
-    }
-    public bool is_Self { get { return this is Type_Self; } }
-    public bool is_SelfOwned { get { return this is Type_SelfOwned; } }
-    public bool is_SelfMut { get { return this is Type_SelfMut; } }
-    public bool is_RawType { get { return this is Type_RawType; } }
-    public Dafny.ISequence<Dafny.Rune> dtor_content {
-      get {
-        var d = this;
-        return ((Type_RawType)d)._content;
-      }
-    }
-    public abstract _IType DowncastClone();
-    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
-      if ((this).is_Self) {
-        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&Self");
-      } else if ((this).is_SelfOwned) {
-        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Self");
-      } else if ((this).is_SelfMut) {
-        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&mut Self");
-      } else {
-        return (this).dtor_content;
-      }
-    }
-  }
-  public class Type_Self : Type {
-    public Type_Self() : base() {
-    }
-    public override _IType DowncastClone() {
-      if (this is _IType dt) { return dt; }
-      return new Type_Self();
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.Type_Self;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.Type.Self";
-      return s;
-    }
-  }
-  public class Type_SelfOwned : Type {
-    public Type_SelfOwned() : base() {
-    }
-    public override _IType DowncastClone() {
-      if (this is _IType dt) { return dt; }
-      return new Type_SelfOwned();
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.Type_SelfOwned;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 1;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.Type.SelfOwned";
-      return s;
-    }
-  }
-  public class Type_SelfMut : Type {
-    public Type_SelfMut() : base() {
-    }
-    public override _IType DowncastClone() {
-      if (this is _IType dt) { return dt; }
-      return new Type_SelfMut();
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.Type_SelfMut;
-      return oth != null;
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 2;
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.Type.SelfMut";
-      return s;
-    }
-  }
-  public class Type_RawType : Type {
-    public readonly Dafny.ISequence<Dafny.Rune> _content;
-    public Type_RawType(Dafny.ISequence<Dafny.Rune> content) : base() {
-      this._content = content;
-    }
-    public override _IType DowncastClone() {
-      if (this is _IType dt) { return dt; }
-      return new Type_RawType(_content);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.Type_RawType;
-      return oth != null && object.Equals(this._content, oth._content);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 3;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._content));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.Type.RawType";
-      s += "(";
-      s += this._content.ToVerbatimString(true);
-      s += ")";
-      return s;
-    }
-  }
-
-  public interface _ITrait {
-    bool is_Trait { get; }
-    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_typeParams { get; }
-    RAST._IType dtor_tpe { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_where { get; }
-    Dafny.ISequence<RAST._IImplMember> dtor_body { get; }
-    _ITrait DowncastClone();
-    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
-  }
-  public class Trait : _ITrait {
-    public readonly Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _typeParams;
-    public readonly RAST._IType _tpe;
-    public readonly Dafny.ISequence<Dafny.Rune> _where;
-    public readonly Dafny.ISequence<RAST._IImplMember> _body;
-    public Trait(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> typeParams, RAST._IType tpe, Dafny.ISequence<Dafny.Rune> @where, Dafny.ISequence<RAST._IImplMember> body) {
-      this._typeParams = typeParams;
-      this._tpe = tpe;
-      this._where = @where;
-      this._body = body;
-    }
-    public _ITrait DowncastClone() {
-      if (this is _ITrait dt) { return dt; }
-      return new Trait(_typeParams, _tpe, _where, _body);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.Trait;
-      return oth != null && object.Equals(this._typeParams, oth._typeParams) && object.Equals(this._tpe, oth._tpe) && object.Equals(this._where, oth._where) && object.Equals(this._body, oth._body);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeParams));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._tpe));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._where));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.Trait.Trait";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._typeParams);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._tpe);
-      s += ", ";
-      s += this._where.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._body);
-      s += ")";
-      return s;
-    }
-    private static readonly RAST._ITrait theDefault = create(Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Empty, RAST.Type.Default(), Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<RAST._IImplMember>.Empty);
-    public static RAST._ITrait Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<RAST._ITrait> _TYPE = new Dafny.TypeDescriptor<RAST._ITrait>(RAST.Trait.Default());
-    public static Dafny.TypeDescriptor<RAST._ITrait> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _ITrait create(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> typeParams, RAST._IType tpe, Dafny.ISequence<Dafny.Rune> @where, Dafny.ISequence<RAST._IImplMember> body) {
-      return new Trait(typeParams, tpe, @where, body);
-    }
-    public static _ITrait create_Trait(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> typeParams, RAST._IType tpe, Dafny.ISequence<Dafny.Rune> @where, Dafny.ISequence<RAST._IImplMember> body) {
-      return create(typeParams, tpe, @where, body);
-    }
-    public bool is_Trait { get { return true; } }
-    public Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_typeParams {
-      get {
-        return this._typeParams;
-      }
-    }
-    public RAST._IType dtor_tpe {
-      get {
-        return this._tpe;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> dtor_where {
-      get {
-        return this._where;
-      }
-    }
-    public Dafny.ISequence<RAST._IImplMember> dtor_body {
-      get {
-        return this._body;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
-      return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("trait "), RAST.TypeParam.ToStringMultiple((this).dtor_typeParams, ind)), ((this).dtor_tpe)._ToString(ind)), ((!((this).dtor_where).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))) ? (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), ind), RAST.__default.IND), (this).dtor_where)) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {")), RAST.__default.SeqToString<RAST._IImplMember>((this).dtor_body, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._IImplMember, Dafny.ISequence<Dafny.Rune>>>>((_851_ind) => ((System.Func<RAST._IImplMember, Dafny.ISequence<Dafny.Rune>>)((_852_member) => {
-        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), _851_ind), RAST.__default.IND), (_852_member)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_851_ind, RAST.__default.IND)));
-      })))(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))), (((new BigInteger(((this).dtor_body).Count)).Sign == 0) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")) : (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), ind)))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
-    }
-  }
-
-  public interface _IImpl {
-    bool is_ImplFor { get; }
-    bool is_Impl { get; }
-    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_typeParams { get; }
-    RAST._IType dtor_tpe { get; }
-    RAST._IType dtor_forType { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_where { get; }
-    Dafny.ISequence<RAST._IImplMember> dtor_body { get; }
-    _IImpl DowncastClone();
-    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
-  }
-  public abstract class Impl : _IImpl {
-    public Impl() {
-    }
-    private static readonly RAST._IImpl theDefault = create_ImplFor(Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Empty, RAST.Type.Default(), RAST.Type.Default(), Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<RAST._IImplMember>.Empty);
-    public static RAST._IImpl Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<RAST._IImpl> _TYPE = new Dafny.TypeDescriptor<RAST._IImpl>(RAST.Impl.Default());
-    public static Dafny.TypeDescriptor<RAST._IImpl> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IImpl create_ImplFor(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> typeParams, RAST._IType tpe, RAST._IType forType, Dafny.ISequence<Dafny.Rune> @where, Dafny.ISequence<RAST._IImplMember> body) {
-      return new Impl_ImplFor(typeParams, tpe, forType, @where, body);
-    }
-    public static _IImpl create_Impl(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> typeParams, RAST._IType tpe, Dafny.ISequence<Dafny.Rune> @where, Dafny.ISequence<RAST._IImplMember> body) {
-      return new Impl_Impl(typeParams, tpe, @where, body);
-    }
-    public bool is_ImplFor { get { return this is Impl_ImplFor; } }
-    public bool is_Impl { get { return this is Impl_Impl; } }
-    public Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_typeParams {
-      get {
-        var d = this;
-        if (d is Impl_ImplFor) { return ((Impl_ImplFor)d)._typeParams; }
-        return ((Impl_Impl)d)._typeParams;
-      }
-    }
-    public RAST._IType dtor_tpe {
-      get {
-        var d = this;
-        if (d is Impl_ImplFor) { return ((Impl_ImplFor)d)._tpe; }
-        return ((Impl_Impl)d)._tpe;
-      }
-    }
-    public RAST._IType dtor_forType {
-      get {
-        var d = this;
-        return ((Impl_ImplFor)d)._forType;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> dtor_where {
-      get {
-        var d = this;
-        if (d is Impl_ImplFor) { return ((Impl_ImplFor)d)._where; }
-        return ((Impl_Impl)d)._where;
-      }
-    }
-    public Dafny.ISequence<RAST._IImplMember> dtor_body {
-      get {
-        var d = this;
-        if (d is Impl_ImplFor) { return ((Impl_ImplFor)d)._body; }
-        return ((Impl_Impl)d)._body;
-      }
-    }
-    public abstract _IImpl DowncastClone();
-    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
-      return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("impl "), RAST.TypeParam.ToStringMultiple((this).dtor_typeParams, ind)), ((this).dtor_tpe)._ToString(ind)), (((this).is_ImplFor) ? (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" for "), ((this).dtor_forType)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND)))) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")))), ((!((this).dtor_where).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))) ? (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), ind), RAST.__default.IND), (this).dtor_where)) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {")), RAST.__default.SeqToString<RAST._IImplMember>((this).dtor_body, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._IImplMember, Dafny.ISequence<Dafny.Rune>>>>((_853_ind) => ((System.Func<RAST._IImplMember, Dafny.ISequence<Dafny.Rune>>)((_854_member) => {
-        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), _853_ind), RAST.__default.IND), (_854_member)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_853_ind, RAST.__default.IND)));
-      })))(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))), (((new BigInteger(((this).dtor_body).Count)).Sign == 0) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")) : (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), ind)))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
-    }
-  }
-  public class Impl_ImplFor : Impl {
-    public readonly Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _typeParams;
-    public readonly RAST._IType _tpe;
-    public readonly RAST._IType _forType;
-    public readonly Dafny.ISequence<Dafny.Rune> _where;
-    public readonly Dafny.ISequence<RAST._IImplMember> _body;
-    public Impl_ImplFor(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> typeParams, RAST._IType tpe, RAST._IType forType, Dafny.ISequence<Dafny.Rune> @where, Dafny.ISequence<RAST._IImplMember> body) : base() {
-      this._typeParams = typeParams;
-      this._tpe = tpe;
-      this._forType = forType;
-      this._where = @where;
-      this._body = body;
-    }
-    public override _IImpl DowncastClone() {
-      if (this is _IImpl dt) { return dt; }
-      return new Impl_ImplFor(_typeParams, _tpe, _forType, _where, _body);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.Impl_ImplFor;
-      return oth != null && object.Equals(this._typeParams, oth._typeParams) && object.Equals(this._tpe, oth._tpe) && object.Equals(this._forType, oth._forType) && object.Equals(this._where, oth._where) && object.Equals(this._body, oth._body);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeParams));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._tpe));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._forType));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._where));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.Impl.ImplFor";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._typeParams);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._tpe);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._forType);
-      s += ", ";
-      s += this._where.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._body);
-      s += ")";
-      return s;
-    }
-  }
-  public class Impl_Impl : Impl {
-    public readonly Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _typeParams;
-    public readonly RAST._IType _tpe;
-    public readonly Dafny.ISequence<Dafny.Rune> _where;
-    public readonly Dafny.ISequence<RAST._IImplMember> _body;
-    public Impl_Impl(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> typeParams, RAST._IType tpe, Dafny.ISequence<Dafny.Rune> @where, Dafny.ISequence<RAST._IImplMember> body) : base() {
-      this._typeParams = typeParams;
-      this._tpe = tpe;
-      this._where = @where;
-      this._body = body;
-    }
-    public override _IImpl DowncastClone() {
-      if (this is _IImpl dt) { return dt; }
-      return new Impl_Impl(_typeParams, _tpe, _where, _body);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.Impl_Impl;
-      return oth != null && object.Equals(this._typeParams, oth._typeParams) && object.Equals(this._tpe, oth._tpe) && object.Equals(this._where, oth._where) && object.Equals(this._body, oth._body);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 1;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeParams));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._tpe));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._where));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.Impl.Impl";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._typeParams);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._tpe);
-      s += ", ";
-      s += this._where.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._body);
-      s += ")";
-      return s;
-    }
-  }
-
-  public interface _IImplMember {
-    bool is_RawImplMember { get; }
-    bool is_FnDecl { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_content { get; }
-    byte dtor_pub { get; }
-    RAST._IFn dtor_fun { get; }
-    _IImplMember DowncastClone();
-    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
-  }
-  public abstract class ImplMember : _IImplMember {
-    public ImplMember() {
-    }
-    private static readonly RAST._IImplMember theDefault = create_RawImplMember(Dafny.Sequence<Dafny.Rune>.Empty);
-    public static RAST._IImplMember Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<RAST._IImplMember> _TYPE = new Dafny.TypeDescriptor<RAST._IImplMember>(RAST.ImplMember.Default());
-    public static Dafny.TypeDescriptor<RAST._IImplMember> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IImplMember create_RawImplMember(Dafny.ISequence<Dafny.Rune> content) {
-      return new ImplMember_RawImplMember(content);
-    }
-    public static _IImplMember create_FnDecl(byte pub, RAST._IFn fun) {
-      return new ImplMember_FnDecl(pub, fun);
-    }
-    public bool is_RawImplMember { get { return this is ImplMember_RawImplMember; } }
-    public bool is_FnDecl { get { return this is ImplMember_FnDecl; } }
-    public Dafny.ISequence<Dafny.Rune> dtor_content {
-      get {
-        var d = this;
-        return ((ImplMember_RawImplMember)d)._content;
-      }
-    }
-    public byte dtor_pub {
-      get {
-        var d = this;
-        return ((ImplMember_FnDecl)d)._pub;
-      }
-    }
-    public RAST._IFn dtor_fun {
-      get {
-        var d = this;
-        return ((ImplMember_FnDecl)d)._fun;
-      }
-    }
-    public abstract _IImplMember DowncastClone();
-    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
-      if ((this).is_FnDecl) {
-        return Dafny.Sequence<Dafny.Rune>.Concat(((((this).dtor_pub) == (RAST.__default.PUB)) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("pub ")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))), ((this).dtor_fun)._ToString(ind));
-      } else {
-        return (this).dtor_content;
-      }
-    }
-  }
-  public class ImplMember_RawImplMember : ImplMember {
-    public readonly Dafny.ISequence<Dafny.Rune> _content;
-    public ImplMember_RawImplMember(Dafny.ISequence<Dafny.Rune> content) : base() {
-      this._content = content;
-    }
-    public override _IImplMember DowncastClone() {
-      if (this is _IImplMember dt) { return dt; }
-      return new ImplMember_RawImplMember(_content);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.ImplMember_RawImplMember;
-      return oth != null && object.Equals(this._content, oth._content);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._content));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.ImplMember.RawImplMember";
-      s += "(";
-      s += this._content.ToVerbatimString(true);
-      s += ")";
-      return s;
-    }
-  }
-  public class ImplMember_FnDecl : ImplMember {
-    public readonly byte _pub;
-    public readonly RAST._IFn _fun;
-    public ImplMember_FnDecl(byte pub, RAST._IFn fun) : base() {
-      this._pub = pub;
-      this._fun = fun;
-    }
-    public override _IImplMember DowncastClone() {
-      if (this is _IImplMember dt) { return dt; }
-      return new ImplMember_FnDecl(_pub, _fun);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.ImplMember_FnDecl;
-      return oth != null && this._pub == oth._pub && object.Equals(this._fun, oth._fun);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 1;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._pub));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._fun));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.ImplMember.FnDecl";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._pub);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._fun);
-      s += ")";
-      return s;
-    }
-  }
-
-  public partial class VISIBILITY {
-    public static System.Collections.Generic.IEnumerable<byte> IntegerRange(BigInteger lo, BigInteger hi) {
-      for (var j = lo; j < hi; j++) { yield return (byte)j; }
-    }
-    private static readonly Dafny.TypeDescriptor<byte> _TYPE = new Dafny.TypeDescriptor<byte>(0);
-    public static Dafny.TypeDescriptor<byte> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static bool _Is(byte __source) {
-      BigInteger _855_x = new BigInteger(__source);
-      return ((_855_x).Sign != -1) && ((_855_x) < (new BigInteger(2)));
-    }
-  }
-
-  public interface _IFormal {
-    bool is_Formal { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
-    RAST._IType dtor_tpe { get; }
-    _IFormal DowncastClone();
-    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
-  }
-  public class Formal : _IFormal {
-    public readonly Dafny.ISequence<Dafny.Rune> _name;
-    public readonly RAST._IType _tpe;
-    public Formal(Dafny.ISequence<Dafny.Rune> name, RAST._IType tpe) {
-      this._name = name;
-      this._tpe = tpe;
-    }
-    public _IFormal DowncastClone() {
-      if (this is _IFormal dt) { return dt; }
-      return new Formal(_name, _tpe);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.Formal;
-      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._tpe, oth._tpe);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._tpe));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.Formal.Formal";
-      s += "(";
-      s += this._name.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._tpe);
-      s += ")";
-      return s;
-    }
-    private static readonly RAST._IFormal theDefault = create(Dafny.Sequence<Dafny.Rune>.Empty, RAST.Type.Default());
-    public static RAST._IFormal Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<RAST._IFormal> _TYPE = new Dafny.TypeDescriptor<RAST._IFormal>(RAST.Formal.Default());
-    public static Dafny.TypeDescriptor<RAST._IFormal> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IFormal create(Dafny.ISequence<Dafny.Rune> name, RAST._IType tpe) {
-      return new Formal(name, tpe);
-    }
-    public static _IFormal create_Formal(Dafny.ISequence<Dafny.Rune> name, RAST._IType tpe) {
-      return create(name, tpe);
-    }
-    public bool is_Formal { get { return true; } }
-    public Dafny.ISequence<Dafny.Rune> dtor_name {
-      get {
-        return this._name;
-      }
-    }
-    public RAST._IType dtor_tpe {
-      get {
-        return this._tpe;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
-      if ((((this).dtor_name).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("self"))) && (((this).dtor_tpe).is_SelfOwned)) {
-        return (this).dtor_name;
-      } else if ((((this).dtor_name).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&self"))) && (((this).dtor_tpe).is_Self)) {
-        return (this).dtor_name;
-      } else if ((((this).dtor_name).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&mut self"))) && (((this).dtor_tpe).is_SelfMut)) {
-        return (this).dtor_name;
-      } else {
-        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat((this).dtor_name, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(": ")), ((this).dtor_tpe)._ToString(ind));
-      }
-    }
-    public static RAST._IFormal self {
-      get {
-        return RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&self"), RAST.Type.create_Self());
-      }
-    }
-    public static RAST._IFormal selfOwned {
-      get {
-        return RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("self"), RAST.Type.create_SelfOwned());
-      }
-    }
-    public static RAST._IFormal selfMut {
-      get {
-        return RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&mut self"), RAST.Type.create_SelfMut());
-      }
-    }
-  }
-
-  public interface _IPattern {
-    bool is_RawPattern { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_content { get; }
-  }
-  public class Pattern : _IPattern {
-    public readonly Dafny.ISequence<Dafny.Rune> _content;
-    public Pattern(Dafny.ISequence<Dafny.Rune> content) {
-      this._content = content;
-    }
-    public static Dafny.ISequence<Dafny.Rune> DowncastClone(Dafny.ISequence<Dafny.Rune> _this) {
-      return _this;
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.Pattern;
-      return oth != null && object.Equals(this._content, oth._content);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._content));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.Pattern.RawPattern";
-      s += "(";
-      s += this._content.ToVerbatimString(true);
-      s += ")";
-      return s;
-    }
-    private static readonly Dafny.ISequence<Dafny.Rune> theDefault = Dafny.Sequence<Dafny.Rune>.Empty;
-    public static Dafny.ISequence<Dafny.Rune> Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>> _TYPE = new Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>>(Dafny.Sequence<Dafny.Rune>.Empty);
-    public static Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IPattern create(Dafny.ISequence<Dafny.Rune> content) {
-      return new Pattern(content);
-    }
-    public static _IPattern create_RawPattern(Dafny.ISequence<Dafny.Rune> content) {
-      return create(content);
-    }
-    public bool is_RawPattern { get { return true; } }
-    public Dafny.ISequence<Dafny.Rune> dtor_content {
-      get {
-        return this._content;
-      }
-    }
-    public static Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> _this, Dafny.ISequence<Dafny.Rune> ind) {
-      return (_this);
-    }
-  }
-
-  public interface _IMatchCase {
-    bool is_MatchCase { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_pattern { get; }
-    RAST._IExpr dtor_rhs { get; }
-    _IMatchCase DowncastClone();
-    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
-  }
-  public class MatchCase : _IMatchCase {
-    public readonly Dafny.ISequence<Dafny.Rune> _pattern;
-    public readonly RAST._IExpr _rhs;
-    public MatchCase(Dafny.ISequence<Dafny.Rune> pattern, RAST._IExpr rhs) {
-      this._pattern = pattern;
-      this._rhs = rhs;
-    }
-    public _IMatchCase DowncastClone() {
-      if (this is _IMatchCase dt) { return dt; }
-      return new MatchCase(_pattern, _rhs);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.MatchCase;
-      return oth != null && object.Equals(this._pattern, oth._pattern) && object.Equals(this._rhs, oth._rhs);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._pattern));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._rhs));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.MatchCase.MatchCase";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._pattern);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._rhs);
-      s += ")";
-      return s;
-    }
-    private static readonly RAST._IMatchCase theDefault = create(Dafny.Sequence<Dafny.Rune>.Empty, RAST.Expr.Default());
-    public static RAST._IMatchCase Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<RAST._IMatchCase> _TYPE = new Dafny.TypeDescriptor<RAST._IMatchCase>(RAST.MatchCase.Default());
-    public static Dafny.TypeDescriptor<RAST._IMatchCase> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IMatchCase create(Dafny.ISequence<Dafny.Rune> pattern, RAST._IExpr rhs) {
-      return new MatchCase(pattern, rhs);
-    }
-    public static _IMatchCase create_MatchCase(Dafny.ISequence<Dafny.Rune> pattern, RAST._IExpr rhs) {
-      return create(pattern, rhs);
-    }
-    public bool is_MatchCase { get { return true; } }
-    public Dafny.ISequence<Dafny.Rune> dtor_pattern {
-      get {
-        return this._pattern;
-      }
-    }
-    public RAST._IExpr dtor_rhs {
-      get {
-        return this._rhs;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
-      Dafny.ISequence<Dafny.Rune> _856_newIndent = ((((this).dtor_rhs).is_Block) ? (ind) : (Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND)));
-      Dafny.ISequence<Dafny.Rune> _857_rhsString = ((this).dtor_rhs)._ToString(_856_newIndent);
-      return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(RAST.Pattern._ToString((this).dtor_pattern, ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" =>")), ((((_857_rhsString).Contains(new Dafny.Rune('\n'))) && (((_857_rhsString).Select(BigInteger.Zero)) != (new Dafny.Rune('{')))) ? (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), ind), RAST.__default.IND), _857_rhsString)) : (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" "), _857_rhsString))));
-    }
-  }
-
-  public interface _IAssignIdentifier {
-    bool is_AssignIdentifier { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_identifier { get; }
-    RAST._IExpr dtor_rhs { get; }
-    _IAssignIdentifier DowncastClone();
-    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
-  }
-  public class AssignIdentifier : _IAssignIdentifier {
-    public readonly Dafny.ISequence<Dafny.Rune> _identifier;
-    public readonly RAST._IExpr _rhs;
-    public AssignIdentifier(Dafny.ISequence<Dafny.Rune> identifier, RAST._IExpr rhs) {
-      this._identifier = identifier;
-      this._rhs = rhs;
-    }
-    public _IAssignIdentifier DowncastClone() {
-      if (this is _IAssignIdentifier dt) { return dt; }
-      return new AssignIdentifier(_identifier, _rhs);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.AssignIdentifier;
-      return oth != null && object.Equals(this._identifier, oth._identifier) && object.Equals(this._rhs, oth._rhs);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._identifier));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._rhs));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.AssignIdentifier.AssignIdentifier";
-      s += "(";
-      s += this._identifier.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._rhs);
-      s += ")";
-      return s;
-    }
-    private static readonly RAST._IAssignIdentifier theDefault = create(Dafny.Sequence<Dafny.Rune>.Empty, RAST.Expr.Default());
-    public static RAST._IAssignIdentifier Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<RAST._IAssignIdentifier> _TYPE = new Dafny.TypeDescriptor<RAST._IAssignIdentifier>(RAST.AssignIdentifier.Default());
-    public static Dafny.TypeDescriptor<RAST._IAssignIdentifier> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IAssignIdentifier create(Dafny.ISequence<Dafny.Rune> identifier, RAST._IExpr rhs) {
-      return new AssignIdentifier(identifier, rhs);
-    }
-    public static _IAssignIdentifier create_AssignIdentifier(Dafny.ISequence<Dafny.Rune> identifier, RAST._IExpr rhs) {
-      return create(identifier, rhs);
-    }
-    public bool is_AssignIdentifier { get { return true; } }
-    public Dafny.ISequence<Dafny.Rune> dtor_identifier {
-      get {
-        return this._identifier;
-      }
-    }
-    public RAST._IExpr dtor_rhs {
-      get {
-        return this._rhs;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
-      return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat((this).dtor_identifier, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(": ")), ((this).dtor_rhs)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND)));
-    }
-  }
-
-  public interface _IExpr {
-    bool is_RawExpr { get; }
-    bool is_Match { get; }
-    bool is_StmtExpr { get; }
-    bool is_Block { get; }
-    bool is_StructBuild { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_content { get; }
-    RAST._IExpr dtor_matchee { get; }
-    Dafny.ISequence<RAST._IMatchCase> dtor_cases { get; }
-    RAST._IExpr dtor_stmt { get; }
-    RAST._IExpr dtor_rhs { get; }
-    RAST._IExpr dtor_underlying { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
-    Dafny.ISequence<RAST._IAssignIdentifier> dtor_assignments { get; }
-    _IExpr DowncastClone();
-    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
-    RAST._IExpr Then(RAST._IExpr rhs2);
-  }
-  public abstract class Expr : _IExpr {
-    public Expr() {
-    }
-    private static readonly RAST._IExpr theDefault = create_RawExpr(Dafny.Sequence<Dafny.Rune>.Empty);
-    public static RAST._IExpr Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<RAST._IExpr> _TYPE = new Dafny.TypeDescriptor<RAST._IExpr>(RAST.Expr.Default());
-    public static Dafny.TypeDescriptor<RAST._IExpr> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IExpr create_RawExpr(Dafny.ISequence<Dafny.Rune> content) {
-      return new Expr_RawExpr(content);
-    }
-    public static _IExpr create_Match(RAST._IExpr matchee, Dafny.ISequence<RAST._IMatchCase> cases) {
-      return new Expr_Match(matchee, cases);
-    }
-    public static _IExpr create_StmtExpr(RAST._IExpr stmt, RAST._IExpr rhs) {
-      return new Expr_StmtExpr(stmt, rhs);
-    }
-    public static _IExpr create_Block(RAST._IExpr underlying) {
-      return new Expr_Block(underlying);
-    }
-    public static _IExpr create_StructBuild(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<RAST._IAssignIdentifier> assignments) {
-      return new Expr_StructBuild(name, assignments);
-    }
-    public bool is_RawExpr { get { return this is Expr_RawExpr; } }
-    public bool is_Match { get { return this is Expr_Match; } }
-    public bool is_StmtExpr { get { return this is Expr_StmtExpr; } }
-    public bool is_Block { get { return this is Expr_Block; } }
-    public bool is_StructBuild { get { return this is Expr_StructBuild; } }
-    public Dafny.ISequence<Dafny.Rune> dtor_content {
-      get {
-        var d = this;
-        return ((Expr_RawExpr)d)._content;
-      }
-    }
-    public RAST._IExpr dtor_matchee {
-      get {
-        var d = this;
-        return ((Expr_Match)d)._matchee;
-      }
-    }
-    public Dafny.ISequence<RAST._IMatchCase> dtor_cases {
-      get {
-        var d = this;
-        return ((Expr_Match)d)._cases;
-      }
-    }
-    public RAST._IExpr dtor_stmt {
-      get {
-        var d = this;
-        return ((Expr_StmtExpr)d)._stmt;
-      }
-    }
-    public RAST._IExpr dtor_rhs {
-      get {
-        var d = this;
-        return ((Expr_StmtExpr)d)._rhs;
-      }
-    }
-    public RAST._IExpr dtor_underlying {
-      get {
-        var d = this;
-        return ((Expr_Block)d)._underlying;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> dtor_name {
-      get {
-        var d = this;
-        return ((Expr_StructBuild)d)._name;
-      }
-    }
-    public Dafny.ISequence<RAST._IAssignIdentifier> dtor_assignments {
-      get {
-        var d = this;
-        return ((Expr_StructBuild)d)._assignments;
-      }
-    }
-    public abstract _IExpr DowncastClone();
-    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
-      if ((this).is_Match) {
-        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("match "), ((this).dtor_matchee)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {")), RAST.__default.SeqToString<RAST._IMatchCase>((this).dtor_cases, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._IMatchCase, Dafny.ISequence<Dafny.Rune>>>>((_858_ind) => ((System.Func<RAST._IMatchCase, Dafny.ISequence<Dafny.Rune>>)((_859_c) => {
-          return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), _858_ind), RAST.__default.IND), (_859_c)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_858_ind, RAST.__default.IND)));
-        })))(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(","))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n")), ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
-      } else if ((this).is_StmtExpr) {
-        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(((this).dtor_stmt)._ToString(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";\n")), ind), ((this).dtor_rhs)._ToString(ind));
-      } else if ((this).is_Block) {
-        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("{\n"), ind), RAST.__default.IND), ((this).dtor_underlying)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n")), ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
-      } else if ((this).is_StructBuild) {
-        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat((this).dtor_name, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {")), RAST.__default.SeqToString<RAST._IAssignIdentifier>((this).dtor_assignments, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._IAssignIdentifier, Dafny.ISequence<Dafny.Rune>>>>((_860_ind) => ((System.Func<RAST._IAssignIdentifier, Dafny.ISequence<Dafny.Rune>>)((_861_assignment) => {
-          return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), _860_ind), RAST.__default.IND), (_861_assignment)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_860_ind, RAST.__default.IND)));
-        })))(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(","))), (((new BigInteger(((this).dtor_assignments).Count)).Sign == 1) ? (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), ind)) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
-      } else {
-        return RAST.__default.AddIndent((this).dtor_content, ind);
-      }
-    }
-    public RAST._IExpr Then(RAST._IExpr rhs2) {
-      return RAST.Expr.create_StmtExpr(this, rhs2);
-    }
-  }
-  public class Expr_RawExpr : Expr {
-    public readonly Dafny.ISequence<Dafny.Rune> _content;
-    public Expr_RawExpr(Dafny.ISequence<Dafny.Rune> content) : base() {
-      this._content = content;
-    }
-    public override _IExpr DowncastClone() {
-      if (this is _IExpr dt) { return dt; }
-      return new Expr_RawExpr(_content);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.Expr_RawExpr;
-      return oth != null && object.Equals(this._content, oth._content);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._content));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.Expr.RawExpr";
-      s += "(";
-      s += this._content.ToVerbatimString(true);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expr_Match : Expr {
-    public readonly RAST._IExpr _matchee;
-    public readonly Dafny.ISequence<RAST._IMatchCase> _cases;
-    public Expr_Match(RAST._IExpr matchee, Dafny.ISequence<RAST._IMatchCase> cases) : base() {
-      this._matchee = matchee;
-      this._cases = cases;
-    }
-    public override _IExpr DowncastClone() {
-      if (this is _IExpr dt) { return dt; }
-      return new Expr_Match(_matchee, _cases);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.Expr_Match;
-      return oth != null && object.Equals(this._matchee, oth._matchee) && object.Equals(this._cases, oth._cases);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 1;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._matchee));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._cases));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.Expr.Match";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._matchee);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._cases);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expr_StmtExpr : Expr {
-    public readonly RAST._IExpr _stmt;
-    public readonly RAST._IExpr _rhs;
-    public Expr_StmtExpr(RAST._IExpr stmt, RAST._IExpr rhs) : base() {
-      this._stmt = stmt;
-      this._rhs = rhs;
-    }
-    public override _IExpr DowncastClone() {
-      if (this is _IExpr dt) { return dt; }
-      return new Expr_StmtExpr(_stmt, _rhs);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.Expr_StmtExpr;
-      return oth != null && object.Equals(this._stmt, oth._stmt) && object.Equals(this._rhs, oth._rhs);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 2;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._stmt));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._rhs));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.Expr.StmtExpr";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._stmt);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._rhs);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expr_Block : Expr {
-    public readonly RAST._IExpr _underlying;
-    public Expr_Block(RAST._IExpr underlying) : base() {
-      this._underlying = underlying;
-    }
-    public override _IExpr DowncastClone() {
-      if (this is _IExpr dt) { return dt; }
-      return new Expr_Block(_underlying);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.Expr_Block;
-      return oth != null && object.Equals(this._underlying, oth._underlying);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 3;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._underlying));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.Expr.Block";
-      s += "(";
-      s += Dafny.Helpers.ToString(this._underlying);
-      s += ")";
-      return s;
-    }
-  }
-  public class Expr_StructBuild : Expr {
-    public readonly Dafny.ISequence<Dafny.Rune> _name;
-    public readonly Dafny.ISequence<RAST._IAssignIdentifier> _assignments;
-    public Expr_StructBuild(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<RAST._IAssignIdentifier> assignments) : base() {
-      this._name = name;
-      this._assignments = assignments;
-    }
-    public override _IExpr DowncastClone() {
-      if (this is _IExpr dt) { return dt; }
-      return new Expr_StructBuild(_name, _assignments);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.Expr_StructBuild;
-      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._assignments, oth._assignments);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 4;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._assignments));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.Expr.StructBuild";
-      s += "(";
-      s += this._name.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._assignments);
-      s += ")";
-      return s;
-    }
-  }
-
-  public interface _IFn {
-    bool is_Fn { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
-    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_typeParams { get; }
-    Dafny.ISequence<RAST._IFormal> dtor_formals { get; }
-    Std.Wrappers._IOption<RAST._IType> dtor_returnType { get; }
-    Dafny.ISequence<Dafny.Rune> dtor_where { get; }
-    Std.Wrappers._IOption<RAST._IExpr> dtor_body { get; }
-    _IFn DowncastClone();
-    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
-  }
-  public class Fn : _IFn {
-    public readonly Dafny.ISequence<Dafny.Rune> _name;
-    public readonly Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _typeParams;
-    public readonly Dafny.ISequence<RAST._IFormal> _formals;
-    public readonly Std.Wrappers._IOption<RAST._IType> _returnType;
-    public readonly Dafny.ISequence<Dafny.Rune> _where;
-    public readonly Std.Wrappers._IOption<RAST._IExpr> _body;
-    public Fn(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> typeParams, Dafny.ISequence<RAST._IFormal> formals, Std.Wrappers._IOption<RAST._IType> returnType, Dafny.ISequence<Dafny.Rune> @where, Std.Wrappers._IOption<RAST._IExpr> body) {
-      this._name = name;
-      this._typeParams = typeParams;
-      this._formals = formals;
-      this._returnType = returnType;
-      this._where = @where;
-      this._body = body;
-    }
-    public _IFn DowncastClone() {
-      if (this is _IFn dt) { return dt; }
-      return new Fn(_name, _typeParams, _formals, _returnType, _where, _body);
-    }
-    public override bool Equals(object other) {
-      var oth = other as RAST.Fn;
-      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._typeParams, oth._typeParams) && object.Equals(this._formals, oth._formals) && object.Equals(this._returnType, oth._returnType) && object.Equals(this._where, oth._where) && object.Equals(this._body, oth._body);
-    }
-    public override int GetHashCode() {
-      ulong hash = 5381;
-      hash = ((hash << 5) + hash) + 0;
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeParams));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._formals));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._returnType));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._where));
-      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
-      return (int)hash;
-    }
-    public override string ToString() {
-      string s = "RAST.Fn.Fn";
-      s += "(";
-      s += this._name.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._typeParams);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._formals);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._returnType);
-      s += ", ";
-      s += this._where.ToVerbatimString(true);
-      s += ", ";
-      s += Dafny.Helpers.ToString(this._body);
-      s += ")";
-      return s;
-    }
-    private static readonly RAST._IFn theDefault = create(Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Empty, Dafny.Sequence<RAST._IFormal>.Empty, Std.Wrappers.Option<RAST._IType>.Default(), Dafny.Sequence<Dafny.Rune>.Empty, Std.Wrappers.Option<RAST._IExpr>.Default());
-    public static RAST._IFn Default() {
-      return theDefault;
-    }
-    private static readonly Dafny.TypeDescriptor<RAST._IFn> _TYPE = new Dafny.TypeDescriptor<RAST._IFn>(RAST.Fn.Default());
-    public static Dafny.TypeDescriptor<RAST._IFn> _TypeDescriptor() {
-      return _TYPE;
-    }
-    public static _IFn create(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> typeParams, Dafny.ISequence<RAST._IFormal> formals, Std.Wrappers._IOption<RAST._IType> returnType, Dafny.ISequence<Dafny.Rune> @where, Std.Wrappers._IOption<RAST._IExpr> body) {
-      return new Fn(name, typeParams, formals, returnType, @where, body);
-    }
-    public static _IFn create_Fn(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> typeParams, Dafny.ISequence<RAST._IFormal> formals, Std.Wrappers._IOption<RAST._IType> returnType, Dafny.ISequence<Dafny.Rune> @where, Std.Wrappers._IOption<RAST._IExpr> body) {
-      return create(name, typeParams, formals, returnType, @where, body);
-    }
-    public bool is_Fn { get { return true; } }
-    public Dafny.ISequence<Dafny.Rune> dtor_name {
-      get {
-        return this._name;
-      }
-    }
-    public Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_typeParams {
-      get {
-        return this._typeParams;
-      }
-    }
-    public Dafny.ISequence<RAST._IFormal> dtor_formals {
-      get {
-        return this._formals;
-      }
-    }
-    public Std.Wrappers._IOption<RAST._IType> dtor_returnType {
-      get {
-        return this._returnType;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> dtor_where {
-      get {
-        return this._where;
-      }
-    }
-    public Std.Wrappers._IOption<RAST._IExpr> dtor_body {
-      get {
-        return this._body;
-      }
-    }
-    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
-      var _pat_let_tv4 = ind;
-      var _pat_let_tv5 = ind;
-      var _pat_let_tv6 = ind;
-      var _pat_let_tv7 = ind;
-      return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("fn "), (this).dtor_name), RAST.TypeParam.ToStringMultiple((this).dtor_typeParams, ind)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), RAST.__default.SeqToString<RAST._IFormal>((this).dtor_formals, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._IFormal, Dafny.ISequence<Dafny.Rune>>>>((_862_ind) => ((System.Func<RAST._IFormal, Dafny.ISequence<Dafny.Rune>>)((_863_formal) => {
-        return (_863_formal)._ToString(_862_ind);
-      })))(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), ((System.Func<Std.Wrappers._IOption<RAST._IType>, Dafny.ISequence<Dafny.Rune>>)((_source26) => {
-        if (_source26.is_None) {
-          return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-        } else {
-          RAST._IType _864___mcc_h0 = _source26.dtor_value;
-          RAST._IType _865_t = _864___mcc_h0;
-          return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" -> "), (_865_t)._ToString(_pat_let_tv4));
-        }
-      }))((this).dtor_returnType)), ((((this).dtor_where).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")) : (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), ind), RAST.__default.IND), (this).dtor_where)))), ((System.Func<Std.Wrappers._IOption<RAST._IExpr>, Dafny.ISequence<Dafny.Rune>>)((_source27) => {
-        if (_source27.is_None) {
-          return Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";");
-        } else {
-          RAST._IExpr _866___mcc_h2 = _source27.dtor_value;
-          RAST._IExpr _867_body = _866___mcc_h2;
-          return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {\n"), _pat_let_tv5), RAST.__default.IND), (_867_body)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_pat_let_tv6, RAST.__default.IND))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n")), _pat_let_tv7), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
-        }
-      }))((this).dtor_body));
-    }
-  }
-} // end of namespace RAST
-namespace DCOMP {
-
-  public partial class __default {
-    public static Dafny.ISequence<Dafny.Rune> runtime(Dafny.ISequence<Dafny.Rune> suffix) {
-      return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime"), suffix);
-    }
-    public static bool is__tuple__numeric(Dafny.ISequence<Dafny.Rune> i) {
-      return ((((new BigInteger((i).Count)) >= (new BigInteger(2))) && (((i).Select(BigInteger.Zero)) == (new Dafny.Rune('_')))) && ((Dafny.Sequence<Dafny.Rune>.UnicodeFromString("0123456789")).Contains((i).Select(BigInteger.One)))) && (((new BigInteger((i).Count)) == (new BigInteger(2))) || (((new BigInteger((i).Count)) == (new BigInteger(3))) && ((Dafny.Sequence<Dafny.Rune>.UnicodeFromString("0123456789")).Contains((i).Select(new BigInteger(2))))));
-    }
-    public static bool has__special(Dafny.ISequence<Dafny.Rune> i) {
-    TAIL_CALL_START:;
-      if ((new BigInteger((i).Count)).Sign == 0) {
-        return false;
-      } else if (((i).Select(BigInteger.Zero)) == (new Dafny.Rune('.'))) {
-        return true;
-      } else if (((i).Select(BigInteger.Zero)) == (new Dafny.Rune('#'))) {
-        return true;
-      } else if (((i).Select(BigInteger.Zero)) == (new Dafny.Rune('_'))) {
-        if ((new BigInteger(2)) <= (new BigInteger((i).Count))) {
-          if (((i).Select(BigInteger.One)) != (new Dafny.Rune('_'))) {
-            return true;
-          } else {
-            Dafny.ISequence<Dafny.Rune> _in111 = (i).Drop(new BigInteger(2));
-            i = _in111;
-            goto TAIL_CALL_START;
-          }
-        } else {
-          return true;
-        }
-      } else {
-        Dafny.ISequence<Dafny.Rune> _in112 = (i).Drop(BigInteger.One);
-        i = _in112;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static Dafny.ISequence<Dafny.Rune> idiomatic__rust(Dafny.ISequence<Dafny.Rune> i) {
-      Dafny.ISequence<Dafny.Rune> _868___accumulator = Dafny.Sequence<Dafny.Rune>.FromElements();
-    TAIL_CALL_START:;
-      if ((new BigInteger((i).Count)).Sign == 0) {
-        return Dafny.Sequence<Dafny.Rune>.Concat(_868___accumulator, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""));
-      } else if (((i).Select(BigInteger.Zero)) == (new Dafny.Rune('_'))) {
-        _868___accumulator = Dafny.Sequence<Dafny.Rune>.Concat(_868___accumulator, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_"));
-        Dafny.ISequence<Dafny.Rune> _in113 = (i).Drop(new BigInteger(2));
-        i = _in113;
-        goto TAIL_CALL_START;
-      } else {
-        _868___accumulator = Dafny.Sequence<Dafny.Rune>.Concat(_868___accumulator, Dafny.Sequence<Dafny.Rune>.FromElements((i).Select(BigInteger.Zero)));
-        Dafny.ISequence<Dafny.Rune> _in114 = (i).Drop(BigInteger.One);
-        i = _in114;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static Dafny.ISequence<Dafny.Rune> replaceDots(Dafny.ISequence<Dafny.Rune> i) {
-      Dafny.ISequence<Dafny.Rune> _869___accumulator = Dafny.Sequence<Dafny.Rune>.FromElements();
-    TAIL_CALL_START:;
-      if ((new BigInteger((i).Count)).Sign == 0) {
-        return Dafny.Sequence<Dafny.Rune>.Concat(_869___accumulator, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""));
-      } else if (((i).Select(BigInteger.Zero)) == (new Dafny.Rune('.'))) {
-        _869___accumulator = Dafny.Sequence<Dafny.Rune>.Concat(_869___accumulator, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_d"));
-        Dafny.ISequence<Dafny.Rune> _in115 = (i).Drop(BigInteger.One);
-        i = _in115;
-        goto TAIL_CALL_START;
-      } else {
-        _869___accumulator = Dafny.Sequence<Dafny.Rune>.Concat(_869___accumulator, Dafny.Sequence<Dafny.Rune>.FromElements((i).Select(BigInteger.Zero)));
-        Dafny.ISequence<Dafny.Rune> _in116 = (i).Drop(BigInteger.One);
-        i = _in116;
-        goto TAIL_CALL_START;
-      }
-    }
-    public static bool is__tuple__builder(Dafny.ISequence<Dafny.Rune> i) {
-      return ((((new BigInteger((i).Count)) >= (new BigInteger(9))) && (((i).Take(new BigInteger(8))).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("___hMake")))) && ((Dafny.Sequence<Dafny.Rune>.UnicodeFromString("0123456789")).Contains((i).Select(new BigInteger(8))))) && (((new BigInteger((i).Count)) == (new BigInteger(9))) || (((new BigInteger((i).Count)) == (new BigInteger(10))) && ((Dafny.Sequence<Dafny.Rune>.UnicodeFromString("0123456789")).Contains((i).Select(new BigInteger(9))))));
-    }
-    public static Dafny.ISequence<Dafny.Rune> better__tuple__builder__name(Dafny.ISequence<Dafny.Rune> i) {
-      return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_T"), (i).Drop(new BigInteger(8)));
-    }
-    public static bool is__dafny__generated__id(Dafny.ISequence<Dafny.Rune> i) {
-      return ((((new BigInteger((i).Count)).Sign == 1) && (((i).Select(BigInteger.Zero)) == (new Dafny.Rune('_')))) && (!(DCOMP.__default.has__special((i).Drop(BigInteger.One))))) && (!((new BigInteger((i).Count)) >= (new BigInteger(2))) || (((i).Select(BigInteger.One)) != (new Dafny.Rune('T'))));
-    }
-    public static bool is__idiomatic__rust(Dafny.ISequence<Dafny.Rune> i) {
-      return (((new BigInteger((i).Count)).Sign == 1) && (!(DCOMP.__default.has__special(i)))) && (!(DCOMP.__default.reserved__rust).Contains(i));
-    }
-    public static Dafny.ISequence<Dafny.Rune> escapeIdent(Dafny.ISequence<Dafny.Rune> i) {
-      if (DCOMP.__default.is__tuple__numeric(i)) {
-        return i;
-      } else if (DCOMP.__default.is__tuple__builder(i)) {
-        return DCOMP.__default.better__tuple__builder__name(i);
-      } else if ((DCOMP.__default.reserved__rust).Contains(i)) {
-        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("r#"), i);
-      } else if (DCOMP.__default.is__idiomatic__rust(i)) {
-        return DCOMP.__default.idiomatic__rust(i);
-      } else if (DCOMP.__default.is__dafny__generated__id(i)) {
-        return i;
-      } else {
-        Dafny.ISequence<Dafny.Rune> _870_r = DCOMP.__default.replaceDots(i);
-        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("r#_"), _870_r);
-      }
-    }
-    public static Dafny.ISequence<Dafny.Rune> DafnyErasable {
-      get {
-        return DCOMP.__default.runtime(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::DafnyErasable"));
-      }
-    }
-    public static Dafny.ISet<Dafny.ISequence<Dafny.Rune>> reserved__rust {
-      get {
-        return Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("as"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("async"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("await"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("break"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("const"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("continue"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("crate"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("dyn"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("else"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("enum"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("extern"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("false"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("fn"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("for"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("if"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("impl"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("in"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("let"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("loop"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("match"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("mod"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("move"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("mut"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("pub"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("ref"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("return"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Self"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("self"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("static"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("struct"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("super"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("trait"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("true"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("type"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("union"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unsafe"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("use"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("where"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("while"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Keywords"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("The"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("abstract"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("become"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("box"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("do"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("final"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("macro"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("override"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("priv"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("try"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("typeof"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unsized"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("virtual"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("yield"));
-      }
-    }
-    public static Dafny.ISequence<Dafny.Rune> IND {
-      get {
-        return RAST.__default.IND;
-      }
-    }
-  }
-
-  public partial class COMP {
-    public COMP() {
-    }
-    public static RAST._IMod GenModule(DAST._IModule mod, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> containingPath) {
-      RAST._IMod s = RAST.Mod.Default();
-      Dafny.ISequence<RAST._IModDecl> _871_body;
-      Dafny.ISequence<RAST._IModDecl> _out15;
-      _out15 = DCOMP.COMP.GenModuleBody((mod).dtor_body, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Concat(containingPath, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements((mod).dtor_name)));
-      _871_body = _out15;
-      s = (((mod).dtor_isExtern) ? (RAST.Mod.create_ExternMod(DCOMP.__default.escapeIdent((mod).dtor_name))) : (RAST.Mod.create_Mod(DCOMP.__default.escapeIdent((mod).dtor_name), _871_body)));
-      return s;
-    }
-    public static Dafny.ISequence<RAST._IModDecl> GenModuleBody(Dafny.ISequence<DAST._IModuleItem> body, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> containingPath) {
-      Dafny.ISequence<RAST._IModDecl> s = Dafny.Sequence<RAST._IModDecl>.Empty;
-      s = Dafny.Sequence<RAST._IModDecl>.FromElements();
-      BigInteger _872_i;
-      _872_i = BigInteger.Zero;
-      while ((_872_i) < (new BigInteger((body).Count))) {
-        Dafny.ISequence<RAST._IModDecl> _873_generated = Dafny.Sequence<RAST._IModDecl>.Empty;
-        DAST._IModuleItem _source28 = (body).Select(_872_i);
-        if (_source28.is_Module) {
-          DAST._IModule _874___mcc_h0 = _source28.dtor_Module_a0;
-          DAST._IModule _875_m = _874___mcc_h0;
-          RAST._IMod _876_mm;
-          RAST._IMod _out16;
-          _out16 = DCOMP.COMP.GenModule(_875_m, containingPath);
-          _876_mm = _out16;
-          _873_generated = Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_ModDecl(_876_mm));
-        } else if (_source28.is_Class) {
-          DAST._IClass _877___mcc_h1 = _source28.dtor_Class_a0;
-          DAST._IClass _878_c = _877___mcc_h1;
-          Dafny.ISequence<RAST._IModDecl> _out17;
-          _out17 = DCOMP.COMP.GenClass(_878_c, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Concat(containingPath, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements((_878_c).dtor_name)));
-          _873_generated = _out17;
-        } else if (_source28.is_Trait) {
-          DAST._ITrait _879___mcc_h2 = _source28.dtor_Trait_a0;
-          DAST._ITrait _880_t = _879___mcc_h2;
-          Dafny.ISequence<Dafny.Rune> _881_tt;
-          Dafny.ISequence<Dafny.Rune> _out18;
-          _out18 = DCOMP.COMP.GenTrait(_880_t, containingPath);
-          _881_tt = _out18;
-          _873_generated = Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_RawDecl(_881_tt));
-        } else if (_source28.is_Newtype) {
-          DAST._INewtype _882___mcc_h3 = _source28.dtor_Newtype_a0;
-          DAST._INewtype _883_n = _882___mcc_h3;
-          Dafny.ISequence<RAST._IModDecl> _out19;
-          _out19 = DCOMP.COMP.GenNewtype(_883_n);
-          _873_generated = _out19;
-        } else {
-          DAST._IDatatype _884___mcc_h4 = _source28.dtor_Datatype_a0;
-          DAST._IDatatype _885_d = _884___mcc_h4;
-          Dafny.ISequence<RAST._IModDecl> _out20;
-          _out20 = DCOMP.COMP.GenDatatype(_885_d);
-          _873_generated = _out20;
-        }
-        s = Dafny.Sequence<RAST._IModDecl>.Concat(s, _873_generated);
-        _872_i = (_872_i) + (BigInteger.One);
-      }
-      return s;
-    }
-    public static void GenTypeParameters(Dafny.ISequence<DAST._IType> @params, out Dafny.ISet<DAST._IType> typeParamsSet, out Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> typeParams, out Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> constrainedTypeParams, out Dafny.ISequence<Dafny.Rune> whereConstraints, out Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> constrainedEraseParams, out Dafny.ISequence<Dafny.Rune> unerasedParams, out Dafny.ISequence<Dafny.Rune> erasedParams) {
-      typeParamsSet = Dafny.Set<DAST._IType>.Empty;
-      typeParams = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Empty;
-      constrainedTypeParams = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Empty;
-      whereConstraints = Dafny.Sequence<Dafny.Rune>.Empty;
-      constrainedEraseParams = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Empty;
-      unerasedParams = Dafny.Sequence<Dafny.Rune>.Empty;
-      erasedParams = Dafny.Sequence<Dafny.Rune>.Empty;
-      typeParamsSet = Dafny.Set<DAST._IType>.FromElements();
-      typeParams = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements();
-      constrainedTypeParams = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements();
-      whereConstraints = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-      constrainedEraseParams = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements();
-      unerasedParams = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-      erasedParams = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-      BigInteger _886_tpI;
-      _886_tpI = BigInteger.Zero;
-      if ((new BigInteger((@params).Count)).Sign == 1) {
-        whereConstraints = Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" where ");
-        unerasedParams = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<");
-        erasedParams = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<");
-        while ((_886_tpI) < (new BigInteger((@params).Count))) {
-          DAST._IType _887_tp;
-          _887_tp = (@params).Select(_886_tpI);
-          typeParamsSet = Dafny.Set<DAST._IType>.Union(typeParamsSet, Dafny.Set<DAST._IType>.FromElements(_887_tp));
-          Dafny.ISequence<Dafny.Rune> _888_genTp;
-          Dafny.ISequence<Dafny.Rune> _out21;
-          _out21 = DCOMP.COMP.GenType(_887_tp, false, false);
-          _888_genTp = _out21;
-          typeParams = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Concat(typeParams, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(_888_genTp));
-          Dafny.ISequence<Dafny.Rune> _889_baseConstraints;
-          _889_baseConstraints = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(": ::dafny_runtime::DafnyErasable + ::dafny_runtime::DafnyUnerasable<"), _888_genTp), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("> + Clone + ::dafny_runtime::DafnyPrint + ::std::default::Default"));
-          constrainedTypeParams = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Concat(constrainedTypeParams, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_888_genTp, _889_baseConstraints), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" + 'static"))));
-          whereConstraints = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(whereConstraints, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<")), _888_genTp), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ::dafny_runtime::DafnyErasable>::Erased: ::std::cmp::PartialEq")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-          constrainedEraseParams = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Concat(constrainedEraseParams, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_888_genTp, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("__Erased")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _888_genTp), _889_baseConstraints), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" + ::dafny_runtime::DafnyUnerasable<")), _888_genTp), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("__Erased> + 'static"))));
-          unerasedParams = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(unerasedParams, _888_genTp), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("__Erased")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-          erasedParams = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(erasedParams, _888_genTp), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::Erased")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-          _886_tpI = (_886_tpI) + (BigInteger.One);
-        }
-        unerasedParams = Dafny.Sequence<Dafny.Rune>.Concat(unerasedParams, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">"));
-        erasedParams = Dafny.Sequence<Dafny.Rune>.Concat(erasedParams, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">"));
-      }
-    }
-    public static Dafny.ISequence<RAST._IModDecl> GenClass(DAST._IClass c, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> path) {
-      Dafny.ISequence<RAST._IModDecl> s = Dafny.Sequence<RAST._IModDecl>.Empty;
-      Dafny.ISet<DAST._IType> _890_typeParamsSet;
-      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _891_sTypeParams;
-      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _892_sConstrainedTypeParams;
-      Dafny.ISequence<Dafny.Rune> _893_whereConstraints;
-      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _894_constrainedEraseParams;
-      Dafny.ISequence<Dafny.Rune> _895_unerasedParams;
-      Dafny.ISequence<Dafny.Rune> _896_erasedParams;
-      Dafny.ISet<DAST._IType> _out22;
-      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _out23;
-      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _out24;
-      Dafny.ISequence<Dafny.Rune> _out25;
-      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _out26;
-      Dafny.ISequence<Dafny.Rune> _out27;
-      Dafny.ISequence<Dafny.Rune> _out28;
-      DCOMP.COMP.GenTypeParameters((c).dtor_typeParams, out _out22, out _out23, out _out24, out _out25, out _out26, out _out27, out _out28);
-      _890_typeParamsSet = _out22;
-      _891_sTypeParams = _out23;
-      _892_sConstrainedTypeParams = _out24;
-      _893_whereConstraints = _out25;
-      _894_constrainedEraseParams = _out26;
-      _895_unerasedParams = _out27;
-      _896_erasedParams = _out28;
-      Dafny.ISequence<Dafny.Rune> _897_constrainedTypeParams;
-      _897_constrainedTypeParams = RAST.TypeParam.ToStringMultiple(_892_sConstrainedTypeParams, Dafny.Sequence<Dafny.Rune>.Concat(RAST.__default.IND, RAST.__default.IND));
-      Dafny.ISequence<RAST._IFormal> _898_fields;
-      _898_fields = Dafny.Sequence<RAST._IFormal>.FromElements();
-      Dafny.ISequence<RAST._IAssignIdentifier> _899_fieldInits;
-      _899_fieldInits = Dafny.Sequence<RAST._IAssignIdentifier>.FromElements();
-      BigInteger _900_fieldI;
-      _900_fieldI = BigInteger.Zero;
-      while ((_900_fieldI) < (new BigInteger(((c).dtor_fields).Count))) {
-        DAST._IField _901_field;
-        _901_field = ((c).dtor_fields).Select(_900_fieldI);
-        Dafny.ISequence<Dafny.Rune> _902_fieldType;
-        Dafny.ISequence<Dafny.Rune> _out29;
-        _out29 = DCOMP.COMP.GenType(((_901_field).dtor_formal).dtor_typ, false, false);
-        _902_fieldType = _out29;
-        _898_fields = Dafny.Sequence<RAST._IFormal>.Concat(_898_fields, Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("pub "), DCOMP.__default.escapeIdent(((_901_field).dtor_formal).dtor_name)), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::cell::RefCell<"), _902_fieldType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">"))))));
-        Std.Wrappers._IOption<DAST._IExpression> _source29 = (_901_field).dtor_defaultValue;
-        if (_source29.is_None) {
-          {
-            _899_fieldInits = Dafny.Sequence<RAST._IAssignIdentifier>.Concat(_899_fieldInits, Dafny.Sequence<RAST._IAssignIdentifier>.FromElements(RAST.AssignIdentifier.create(DCOMP.__default.escapeIdent(((_901_field).dtor_formal).dtor_name), RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::cell::RefCell::new(::std::default::Default::default())")))));
-          }
-        } else {
-          DAST._IExpression _903___mcc_h0 = _source29.dtor_value;
-          DAST._IExpression _904_e = _903___mcc_h0;
-          {
-            Dafny.ISequence<Dafny.Rune> _905_eStr;
-            bool _906___v1;
-            bool _907___v2;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _908___v3;
-            Dafny.ISequence<Dafny.Rune> _out30;
-            bool _out31;
-            bool _out32;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out33;
-            DCOMP.COMP.GenExpr(_904_e, Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None(), Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(), true, out _out30, out _out31, out _out32, out _out33);
-            _905_eStr = _out30;
-            _906___v1 = _out31;
-            _907___v2 = _out32;
-            _908___v3 = _out33;
-            _899_fieldInits = Dafny.Sequence<RAST._IAssignIdentifier>.Concat(_899_fieldInits, Dafny.Sequence<RAST._IAssignIdentifier>.FromElements(RAST.AssignIdentifier.create(DCOMP.__default.escapeIdent(((_901_field).dtor_formal).dtor_name), RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::cell::RefCell::new("), _905_eStr), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"))))));
-          }
-        }
-        _900_fieldI = (_900_fieldI) + (BigInteger.One);
-      }
-      BigInteger _909_typeParamI;
-      _909_typeParamI = BigInteger.Zero;
-      while ((_909_typeParamI) < (new BigInteger(((c).dtor_typeParams).Count))) {
-        Dafny.ISequence<Dafny.Rune> _910_tpeGen;
-        Dafny.ISequence<Dafny.Rune> _out34;
-        _out34 = DCOMP.COMP.GenType(((c).dtor_typeParams).Select(_909_typeParamI), false, false);
-        _910_tpeGen = _out34;
-        _898_fields = Dafny.Sequence<RAST._IFormal>.Concat(_898_fields, Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_phantom_type_param_"), Std.Strings.__default.OfNat(_909_typeParamI)), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::marker::PhantomData<"), _910_tpeGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">"))))));
-        _899_fieldInits = Dafny.Sequence<RAST._IAssignIdentifier>.Concat(_899_fieldInits, Dafny.Sequence<RAST._IAssignIdentifier>.FromElements(RAST.AssignIdentifier.create(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_phantom_type_param_"), Std.Strings.__default.OfNat(_909_typeParamI)), RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::marker::PhantomData")))));
-        _909_typeParamI = (_909_typeParamI) + (BigInteger.One);
-      }
-      RAST._IStruct _911_struct;
-      _911_struct = RAST.Struct.create(Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(), DCOMP.__default.escapeIdent((c).dtor_name), _891_sTypeParams, RAST.Formals.create_NamedFormals(_898_fields));
-      Dafny.ISequence<Dafny.Rune> _912_typeParams;
-      _912_typeParams = RAST.TypeParam.ToStringMultiple(_891_sTypeParams, Dafny.Sequence<Dafny.Rune>.Concat(RAST.__default.IND, RAST.__default.IND));
-      s = Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_StructDecl(_911_struct));
-      Dafny.ISequence<RAST._IImplMember> _913_implBodyRaw;
-      Dafny.IMap<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>, Dafny.ISequence<RAST._IImplMember>> _914_traitBodies;
-      Dafny.ISequence<RAST._IImplMember> _out35;
-      Dafny.IMap<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>, Dafny.ISequence<RAST._IImplMember>> _out36;
-      DCOMP.COMP.GenClassImplBody((c).dtor_body, false, DAST.Type.create_Path(Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(), Dafny.Sequence<DAST._IType>.FromElements(), DAST.ResolvedType.create_Datatype(path)), _890_typeParamsSet, out _out35, out _out36);
-      _913_implBodyRaw = _out35;
-      _914_traitBodies = _out36;
-      Dafny.ISequence<RAST._IImplMember> _915_implBody;
-      _915_implBody = Dafny.Sequence<RAST._IImplMember>.Concat(Dafny.Sequence<RAST._IImplMember>.FromElements(RAST.ImplMember.create_FnDecl(RAST.__default.PUB, RAST.Fn.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("new"), Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(), Dafny.Sequence<RAST._IFormal>.FromElements(), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_SelfOwned()), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Std.Wrappers.Option<RAST._IExpr>.create_Some(RAST.Expr.create_StructBuild(DCOMP.__default.escapeIdent((c).dtor_name), _899_fieldInits))))), _913_implBodyRaw);
-      RAST._IImpl _916_i;
-      _916_i = RAST.Impl.create_Impl(_892_sConstrainedTypeParams, RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), _912_typeParams)), _893_whereConstraints, _915_implBody);
-      s = Dafny.Sequence<RAST._IModDecl>.Concat(s, Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_ImplDecl(_916_i)));
-      if ((new BigInteger(((c).dtor_superClasses).Count)).Sign == 1) {
-        BigInteger _917_i;
-        _917_i = BigInteger.Zero;
-        while ((_917_i) < (new BigInteger(((c).dtor_superClasses).Count))) {
-          DAST._IType _918_superClass;
-          _918_superClass = ((c).dtor_superClasses).Select(_917_i);
-          DAST._IType _source30 = _918_superClass;
-          if (_source30.is_Path) {
-            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _919___mcc_h1 = _source30.dtor_Path_a0;
-            Dafny.ISequence<DAST._IType> _920___mcc_h2 = _source30.dtor_typeArgs;
-            DAST._IResolvedType _921___mcc_h3 = _source30.dtor_resolved;
-            DAST._IResolvedType _source31 = _921___mcc_h3;
-            if (_source31.is_Datatype) {
-              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _922___mcc_h7 = _source31.dtor_path;
-            } else if (_source31.is_Trait) {
-              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _923___mcc_h9 = _source31.dtor_path;
-              Dafny.ISequence<DAST._IType> _924_typeArgs = _920___mcc_h2;
-              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _925_traitPath = _919___mcc_h1;
-              {
-                Dafny.ISequence<Dafny.Rune> _926_pathStr;
-                Dafny.ISequence<Dafny.Rune> _out37;
-                _out37 = DCOMP.COMP.GenPath(_925_traitPath);
-                _926_pathStr = _out37;
-                Dafny.ISequence<Dafny.Rune> _927_typeArgs;
-                Dafny.ISequence<Dafny.Rune> _out38;
-                _out38 = DCOMP.COMP.GenTypeArgs(_924_typeArgs, false, false);
-                _927_typeArgs = _out38;
-                Dafny.ISequence<RAST._IImplMember> _928_body;
-                _928_body = Dafny.Sequence<RAST._IImplMember>.FromElements();
-                if ((_914_traitBodies).Contains(_925_traitPath)) {
-                  _928_body = Dafny.Map<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>, Dafny.ISequence<RAST._IImplMember>>.Select(_914_traitBodies, _925_traitPath);
-                }
-                Dafny.ISequence<Dafny.Rune> _929_genSelfPath;
-                Dafny.ISequence<Dafny.Rune> _out39;
-                _out39 = DCOMP.COMP.GenPath(path);
-                _929_genSelfPath = _out39;
-                RAST._IModDecl _930_x;
-                _930_x = RAST.ModDecl.create_ImplDecl(RAST.Impl.create_ImplFor(_892_sConstrainedTypeParams, RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(_926_pathStr, _927_typeArgs)), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc<"), _929_genSelfPath), _912_typeParams), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">"))), _893_whereConstraints, _928_body));
-                s = Dafny.Sequence<RAST._IModDecl>.Concat(s, Dafny.Sequence<RAST._IModDecl>.FromElements(_930_x));
-              }
-            } else {
-              DAST._IType _931___mcc_h11 = _source31.dtor_Newtype_a0;
-            }
-          } else if (_source30.is_Nullable) {
-            DAST._IType _932___mcc_h13 = _source30.dtor_Nullable_a0;
-          } else if (_source30.is_Tuple) {
-            Dafny.ISequence<DAST._IType> _933___mcc_h15 = _source30.dtor_Tuple_a0;
-          } else if (_source30.is_Array) {
-            DAST._IType _934___mcc_h17 = _source30.dtor_element;
-            BigInteger _935___mcc_h18 = _source30.dtor_dims;
-          } else if (_source30.is_Seq) {
-            DAST._IType _936___mcc_h21 = _source30.dtor_element;
-          } else if (_source30.is_Set) {
-            DAST._IType _937___mcc_h23 = _source30.dtor_element;
-          } else if (_source30.is_Multiset) {
-            DAST._IType _938___mcc_h25 = _source30.dtor_element;
-          } else if (_source30.is_Map) {
-            DAST._IType _939___mcc_h27 = _source30.dtor_key;
-            DAST._IType _940___mcc_h28 = _source30.dtor_value;
-          } else if (_source30.is_Arrow) {
-            Dafny.ISequence<DAST._IType> _941___mcc_h31 = _source30.dtor_args;
-            DAST._IType _942___mcc_h32 = _source30.dtor_result;
-          } else if (_source30.is_Primitive) {
-            DAST._IPrimitive _943___mcc_h35 = _source30.dtor_Primitive_a0;
-          } else if (_source30.is_Passthrough) {
-            Dafny.ISequence<Dafny.Rune> _944___mcc_h37 = _source30.dtor_Passthrough_a0;
-          } else {
-            Dafny.ISequence<Dafny.Rune> _945___mcc_h39 = _source30.dtor_TypeArg_a0;
-          }
-          _917_i = (_917_i) + (BigInteger.One);
-        }
-      }
-      RAST._IImpl _946_d;
-      _946_d = RAST.Impl.create_ImplFor(_892_sConstrainedTypeParams, RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::default::Default")), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), _912_typeParams)), _893_whereConstraints, Dafny.Sequence<RAST._IImplMember>.FromElements(RAST.ImplMember.create_FnDecl(RAST.__default.PRIV, RAST.Fn.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("default"), Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(), Dafny.Sequence<RAST._IFormal>.FromElements(), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_SelfOwned()), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Std.Wrappers.Option<RAST._IExpr>.create_Some(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::new()"))))))));
-      Dafny.ISequence<RAST._IModDecl> _947_defaultImpl;
-      _947_defaultImpl = Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_ImplDecl(_946_d));
-      RAST._IImpl _948_p;
-      _948_p = RAST.Impl.create_ImplFor(_892_sConstrainedTypeParams, RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyPrint")), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), _912_typeParams)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Dafny.Sequence<RAST._IImplMember>.FromElements(RAST.ImplMember.create_FnDecl(RAST.__default.PRIV, RAST.Fn.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("fmt_print"), Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(), Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.self, RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_formatter"), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&mut ::std::fmt::Formatter"))), RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_in_seq"), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("bool")))), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("std::fmt::Result"))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Std.Wrappers.Option<RAST._IExpr>.create_Some(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("write!(_formatter, \""), ((c).dtor_enclosingModule)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), (c).dtor_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\")"))))))));
-      Dafny.ISequence<RAST._IModDecl> _949_printImpl;
-      _949_printImpl = Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_ImplDecl(_948_p));
-      RAST._IImpl _950_pp;
-      _950_pp = RAST.Impl.create_ImplFor(_891_sTypeParams, RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::cmp::PartialEq")), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), _912_typeParams)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Dafny.Sequence<RAST._IImplMember>.FromElements(RAST.ImplMember.create_FnDecl(RAST.__default.PRIV, RAST.Fn.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("eq"), Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(), Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.self, RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("other"), RAST.Type.create_Self())), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("bool"))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Std.Wrappers.Option<RAST._IExpr>.create_Some(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ptr::eq(self, other)")))))));
-      Dafny.ISequence<RAST._IModDecl> _951_ptrPartialEqImpl;
-      _951_ptrPartialEqImpl = Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_ImplDecl(_950_pp));
-      RAST._IModDecl _952_ii;
-      _952_ii = RAST.ModDecl.create_ImplDecl(RAST.Impl.create_ImplFor(_892_sConstrainedTypeParams, RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable")), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), _912_typeParams)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Dafny.Sequence<RAST._IImplMember>.FromElements(RAST.ImplMember.create_RawImplMember(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("type Erased = "), DCOMP.__default.escapeIdent((c).dtor_name)), _896_erasedParams), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";"))))));
-      RAST._IModDecl _953_u;
-      _953_u = RAST.ModDecl.create_ImplDecl(RAST.Impl.create_ImplFor(_894_constrainedEraseParams, RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyUnerasable<"), DCOMP.__default.escapeIdent((c).dtor_name)), _895_unerasedParams), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">"))), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), _912_typeParams)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Dafny.Sequence<RAST._IImplMember>.FromElements()));
-      Dafny.ISequence<RAST._IModDecl> _954_identEraseImpls;
-      _954_identEraseImpls = Dafny.Sequence<RAST._IModDecl>.FromElements(_952_ii, _953_u);
-      s = Dafny.Sequence<RAST._IModDecl>.Concat(Dafny.Sequence<RAST._IModDecl>.Concat(Dafny.Sequence<RAST._IModDecl>.Concat(Dafny.Sequence<RAST._IModDecl>.Concat(s, _947_defaultImpl), _949_printImpl), _951_ptrPartialEqImpl), _954_identEraseImpls);
-      return s;
-    }
-    public static Dafny.ISequence<Dafny.Rune> GenTrait(DAST._ITrait t, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> containingPath) {
-      Dafny.ISequence<Dafny.Rune> s = Dafny.Sequence<Dafny.Rune>.Empty;
-      Dafny.ISet<DAST._IType> _955_typeParamsSet;
-      _955_typeParamsSet = Dafny.Set<DAST._IType>.FromElements();
-      Dafny.ISequence<Dafny.Rune> _956_typeParams;
-      _956_typeParams = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-      BigInteger _957_tpI;
-      _957_tpI = BigInteger.Zero;
-      if ((new BigInteger(((t).dtor_typeParams).Count)).Sign == 1) {
-        _956_typeParams = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<");
-        while ((_957_tpI) < (new BigInteger(((t).dtor_typeParams).Count))) {
-          DAST._IType _958_tp;
-          _958_tp = ((t).dtor_typeParams).Select(_957_tpI);
-          _955_typeParamsSet = Dafny.Set<DAST._IType>.Union(_955_typeParamsSet, Dafny.Set<DAST._IType>.FromElements(_958_tp));
-          Dafny.ISequence<Dafny.Rune> _959_genTp;
-          Dafny.ISequence<Dafny.Rune> _out40;
-          _out40 = DCOMP.COMP.GenType(_958_tp, false, false);
-          _959_genTp = _out40;
-          _956_typeParams = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_956_typeParams, _959_genTp), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-          _957_tpI = (_957_tpI) + (BigInteger.One);
-        }
-        _956_typeParams = Dafny.Sequence<Dafny.Rune>.Concat(_956_typeParams, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">"));
-      }
-      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _960_fullPath;
-      _960_fullPath = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Concat(containingPath, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements((t).dtor_name));
-      Dafny.ISequence<RAST._IImplMember> _961_implBody;
-      Dafny.IMap<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>, Dafny.ISequence<RAST._IImplMember>> _962___v6;
-      Dafny.ISequence<RAST._IImplMember> _out41;
-      Dafny.IMap<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>, Dafny.ISequence<RAST._IImplMember>> _out42;
-      DCOMP.COMP.GenClassImplBody((t).dtor_body, true, DAST.Type.create_Path(_960_fullPath, Dafny.Sequence<DAST._IType>.FromElements(), DAST.ResolvedType.create_Trait(_960_fullPath)), _955_typeParamsSet, out _out41, out _out42);
-      _961_implBody = _out41;
-      _962___v6 = _out42;
-      s = (RAST.ModDecl.create_TraitDecl(RAST.Trait.create(Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((t).dtor_name), _956_typeParams)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), _961_implBody)))._ToString(DCOMP.__default.IND);
-      return s;
-    }
-    public static Dafny.ISequence<RAST._IModDecl> GenNewtype(DAST._INewtype c) {
-      Dafny.ISequence<RAST._IModDecl> s = Dafny.Sequence<RAST._IModDecl>.Empty;
-      Dafny.ISet<DAST._IType> _963_typeParamsSet;
-      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _964_sTypeParams;
-      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _965_sConstrainedTypeParams;
-      Dafny.ISequence<Dafny.Rune> _966_whereConstraints;
-      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _967___v7;
-      Dafny.ISequence<Dafny.Rune> _968___v8;
-      Dafny.ISequence<Dafny.Rune> _969___v9;
-      Dafny.ISet<DAST._IType> _out43;
-      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _out44;
-      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _out45;
-      Dafny.ISequence<Dafny.Rune> _out46;
-      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _out47;
-      Dafny.ISequence<Dafny.Rune> _out48;
-      Dafny.ISequence<Dafny.Rune> _out49;
-      DCOMP.COMP.GenTypeParameters((c).dtor_typeParams, out _out43, out _out44, out _out45, out _out46, out _out47, out _out48, out _out49);
-      _963_typeParamsSet = _out43;
-      _964_sTypeParams = _out44;
-      _965_sConstrainedTypeParams = _out45;
-      _966_whereConstraints = _out46;
-      _967___v7 = _out47;
-      _968___v8 = _out48;
-      _969___v9 = _out49;
-      Dafny.ISequence<Dafny.Rune> _970_typeParams;
-      _970_typeParams = RAST.TypeParam.ToStringMultiple(_964_sTypeParams, Dafny.Sequence<Dafny.Rune>.Concat(RAST.__default.IND, RAST.__default.IND));
-      Dafny.ISequence<Dafny.Rune> _971_constrainedTypeParams;
-      _971_constrainedTypeParams = RAST.TypeParam.ToStringMultiple(_965_sConstrainedTypeParams, Dafny.Sequence<Dafny.Rune>.Concat(RAST.__default.IND, RAST.__default.IND));
-      Dafny.ISequence<Dafny.Rune> _972_underlyingType;
-      Dafny.ISequence<Dafny.Rune> _out50;
-      _out50 = DCOMP.COMP.GenType((c).dtor_base, false, false);
-      _972_underlyingType = _out50;
-      s = Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_StructDecl(RAST.Struct.create(Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("#[derive(Clone, PartialEq)]"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("#[repr(transparent)]")), DCOMP.__default.escapeIdent((c).dtor_name), _964_sTypeParams, RAST.Formals.create_NamelessFormals(Dafny.Sequence<RAST._IType>.FromElements(RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("pub "), _972_underlyingType)))))));
-      s = Dafny.Sequence<RAST._IModDecl>.Concat(s, Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_ImplDecl(RAST.Impl.create_ImplFor(_965_sConstrainedTypeParams, RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable")), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), _970_typeParams)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Dafny.Sequence<RAST._IImplMember>.FromElements(RAST.ImplMember.create_RawImplMember(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("type Erased = "), _972_underlyingType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";"))))))));
-      s = Dafny.Sequence<RAST._IModDecl>.Concat(s, Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_ImplDecl(RAST.Impl.create_ImplFor(_965_sConstrainedTypeParams, RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyUnerasable<"), _972_underlyingType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">"))), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), _970_typeParams)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Dafny.Sequence<RAST._IImplMember>.FromElements()))));
-      s = Dafny.Sequence<RAST._IModDecl>.Concat(s, Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_ImplDecl(RAST.Impl.create_ImplFor(_965_sConstrainedTypeParams, RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyUnerasable<"), DCOMP.__default.escapeIdent((c).dtor_name)), _970_typeParams), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">"))), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), _970_typeParams)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Dafny.Sequence<RAST._IImplMember>.FromElements()))));
-      Dafny.ISequence<Dafny.Rune> _973_fnBody;
-      _973_fnBody = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-      Std.Wrappers._IOption<DAST._IExpression> _source32 = (c).dtor_witnessExpr;
-      if (_source32.is_None) {
-        {
-          _973_fnBody = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_973_fnBody, DCOMP.__default.escapeIdent((c).dtor_name)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(::std::default::Default::default())"));
-        }
-      } else {
-        DAST._IExpression _974___mcc_h0 = _source32.dtor_value;
-        DAST._IExpression _975_e = _974___mcc_h0;
-        {
-          Dafny.ISequence<Dafny.Rune> _976_eStr;
-          bool _977___v10;
-          bool _978___v11;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _979___v12;
-          Dafny.ISequence<Dafny.Rune> _out51;
-          bool _out52;
-          bool _out53;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out54;
-          DCOMP.COMP.GenExpr(_975_e, Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None(), Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(), true, out _out51, out _out52, out _out53, out _out54);
-          _976_eStr = _out51;
-          _977___v10 = _out52;
-          _978___v11 = _out53;
-          _979___v12 = _out54;
-          _973_fnBody = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_973_fnBody, DCOMP.__default.escapeIdent((c).dtor_name)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _976_eStr), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")\n"));
-        }
-      }
-      RAST._IImplMember _980_body;
-      _980_body = RAST.ImplMember.create_FnDecl(RAST.__default.PRIV, RAST.Fn.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("default"), Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(), Dafny.Sequence<RAST._IFormal>.FromElements(), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_SelfOwned()), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Std.Wrappers.Option<RAST._IExpr>.create_Some(RAST.Expr.create_RawExpr(_973_fnBody))));
-      s = Dafny.Sequence<RAST._IModDecl>.Concat(s, Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_ImplDecl(RAST.Impl.create_ImplFor(_965_sConstrainedTypeParams, RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::default::Default")), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), _970_typeParams)), _966_whereConstraints, Dafny.Sequence<RAST._IImplMember>.FromElements(_980_body)))));
-      s = Dafny.Sequence<RAST._IModDecl>.Concat(s, Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_ImplDecl(RAST.Impl.create_ImplFor(_965_sConstrainedTypeParams, RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyPrint")), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), _970_typeParams)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Dafny.Sequence<RAST._IImplMember>.FromElements(RAST.ImplMember.create_FnDecl(RAST.__default.PRIV, RAST.Fn.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("fmt_print"), Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(), Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.self, RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_formatter"), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&mut ::std::fmt::Formatter"))), RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("in_seq"), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("bool")))), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::fmt::Result"))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Std.Wrappers.Option<RAST._IExpr>.create_Some(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyPrint::fmt_print(&self.0, _formatter, in_seq)"))))))))));
-      s = Dafny.Sequence<RAST._IModDecl>.Concat(s, Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_ImplDecl(RAST.Impl.create_ImplFor(_965_sConstrainedTypeParams, RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref")), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), _970_typeParams)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Dafny.Sequence<RAST._IImplMember>.FromElements(RAST.ImplMember.create_RawImplMember(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("type Target = "), _972_underlyingType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";"))), RAST.ImplMember.create_FnDecl(RAST.__default.PRIV, RAST.Fn.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("deref"), Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(), Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.self), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&Self::Target"))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Std.Wrappers.Option<RAST._IExpr>.create_Some(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&self.0"))))))))));
-      return s;
-    }
-    public static Dafny.ISequence<RAST._IModDecl> GenDatatype(DAST._IDatatype c) {
-      Dafny.ISequence<RAST._IModDecl> s = Dafny.Sequence<RAST._IModDecl>.Empty;
-      Dafny.ISet<DAST._IType> _981_typeParamsSet;
-      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _982_sTypeParams;
-      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _983_sConstrainedTypeParams;
-      Dafny.ISequence<Dafny.Rune> _984_whereConstraints;
-      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _985_sConstrainedEraseParams;
-      Dafny.ISequence<Dafny.Rune> _986_unerasedParams;
-      Dafny.ISequence<Dafny.Rune> _987_erasedParams;
-      Dafny.ISet<DAST._IType> _out55;
-      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _out56;
-      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _out57;
-      Dafny.ISequence<Dafny.Rune> _out58;
-      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _out59;
-      Dafny.ISequence<Dafny.Rune> _out60;
-      Dafny.ISequence<Dafny.Rune> _out61;
-      DCOMP.COMP.GenTypeParameters((c).dtor_typeParams, out _out55, out _out56, out _out57, out _out58, out _out59, out _out60, out _out61);
-      _981_typeParamsSet = _out55;
-      _982_sTypeParams = _out56;
-      _983_sConstrainedTypeParams = _out57;
-      _984_whereConstraints = _out58;
-      _985_sConstrainedEraseParams = _out59;
-      _986_unerasedParams = _out60;
-      _987_erasedParams = _out61;
-      Dafny.ISequence<Dafny.Rune> _988_typeParams;
-      _988_typeParams = RAST.TypeParam.ToStringMultiple(_982_sTypeParams, Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.IND, DCOMP.__default.IND));
-      Dafny.ISequence<Dafny.Rune> _989_constrainedTypeParams;
-      _989_constrainedTypeParams = RAST.TypeParam.ToStringMultiple(_983_sConstrainedTypeParams, Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.IND, DCOMP.__default.IND));
-      Dafny.ISequence<Dafny.Rune> _990_constrainedEraseParams;
-      _990_constrainedEraseParams = RAST.TypeParam.ToStringMultiple(_985_sConstrainedEraseParams, DCOMP.__default.IND);
-      Dafny.ISequence<RAST._IEnumCase> _991_ctors;
-      _991_ctors = Dafny.Sequence<RAST._IEnumCase>.FromElements();
-      BigInteger _992_i;
-      _992_i = BigInteger.Zero;
-      while ((_992_i) < (new BigInteger(((c).dtor_ctors).Count))) {
-        DAST._IDatatypeCtor _993_ctor;
-        _993_ctor = ((c).dtor_ctors).Select(_992_i);
-        Dafny.ISequence<RAST._IFormal> _994_ctorArgs;
-        _994_ctorArgs = Dafny.Sequence<RAST._IFormal>.FromElements();
-        BigInteger _995_j;
-        _995_j = BigInteger.Zero;
-        while ((_995_j) < (new BigInteger(((_993_ctor).dtor_args).Count))) {
-          DAST._IFormal _996_formal;
-          _996_formal = ((_993_ctor).dtor_args).Select(_995_j);
-          Dafny.ISequence<Dafny.Rune> _997_formalType;
-          Dafny.ISequence<Dafny.Rune> _out62;
-          _out62 = DCOMP.COMP.GenType((_996_formal).dtor_typ, false, false);
-          _997_formalType = _out62;
-          if ((c).dtor_isCo) {
-            _994_ctorArgs = Dafny.Sequence<RAST._IFormal>.Concat(_994_ctorArgs, Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.create(DCOMP.__default.escapeIdent((_996_formal).dtor_name), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::LazyFieldWrapper<"), _997_formalType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">"))))));
-          } else {
-            _994_ctorArgs = Dafny.Sequence<RAST._IFormal>.Concat(_994_ctorArgs, Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.create(DCOMP.__default.escapeIdent((_996_formal).dtor_name), RAST.Type.create_RawType(_997_formalType))));
-          }
-          _995_j = (_995_j) + (BigInteger.One);
-        }
-        _991_ctors = Dafny.Sequence<RAST._IEnumCase>.Concat(_991_ctors, Dafny.Sequence<RAST._IEnumCase>.FromElements(RAST.EnumCase.create(DCOMP.__default.escapeIdent((_993_ctor).dtor_name), RAST.Formals.create_NamedFormals(_994_ctorArgs))));
-        _992_i = (_992_i) + (BigInteger.One);
-      }
-      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _998_selfPath;
-      _998_selfPath = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements((c).dtor_name);
-      Dafny.ISequence<RAST._IImplMember> _999_implBodyRaw;
-      Dafny.IMap<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>, Dafny.ISequence<RAST._IImplMember>> _1000_traitBodies;
-      Dafny.ISequence<RAST._IImplMember> _out63;
-      Dafny.IMap<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>, Dafny.ISequence<RAST._IImplMember>> _out64;
-      DCOMP.COMP.GenClassImplBody((c).dtor_body, false, DAST.Type.create_Path(Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(), Dafny.Sequence<DAST._IType>.FromElements(), DAST.ResolvedType.create_Datatype(_998_selfPath)), _981_typeParamsSet, out _out63, out _out64);
-      _999_implBodyRaw = _out63;
-      _1000_traitBodies = _out64;
-      Dafny.ISequence<RAST._IImplMember> _1001_implBody;
-      _1001_implBody = _999_implBodyRaw;
-      _992_i = BigInteger.Zero;
-      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1002_emittedFields;
-      _1002_emittedFields = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-      while ((_992_i) < (new BigInteger(((c).dtor_ctors).Count))) {
-        DAST._IDatatypeCtor _1003_ctor;
-        _1003_ctor = ((c).dtor_ctors).Select(_992_i);
-        BigInteger _1004_j;
-        _1004_j = BigInteger.Zero;
-        while ((_1004_j) < (new BigInteger(((_1003_ctor).dtor_args).Count))) {
-          DAST._IFormal _1005_formal;
-          _1005_formal = ((_1003_ctor).dtor_args).Select(_1004_j);
-          if (!((_1002_emittedFields).Contains((_1005_formal).dtor_name))) {
-            _1002_emittedFields = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(_1002_emittedFields, Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements((_1005_formal).dtor_name));
-            Dafny.ISequence<Dafny.Rune> _1006_formalType;
-            Dafny.ISequence<Dafny.Rune> _out65;
-            _out65 = DCOMP.COMP.GenType((_1005_formal).dtor_typ, false, false);
-            _1006_formalType = _out65;
-            Dafny.ISequence<RAST._IMatchCase> _1007_cases;
-            _1007_cases = Dafny.Sequence<RAST._IMatchCase>.FromElements();
-            BigInteger _1008_k;
-            _1008_k = BigInteger.Zero;
-            while ((_1008_k) < (new BigInteger(((c).dtor_ctors).Count))) {
-              DAST._IDatatypeCtor _1009_ctor2;
-              _1009_ctor2 = ((c).dtor_ctors).Select(_1008_k);
-              Dafny.ISequence<Dafny.Rune> _1010_pattern;
-              _1010_pattern = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::")), DCOMP.__default.escapeIdent((_1009_ctor2).dtor_name)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" { "));
-              Dafny.ISequence<Dafny.Rune> _1011_rhs = Dafny.Sequence<Dafny.Rune>.Empty;
-              BigInteger _1012_l;
-              _1012_l = BigInteger.Zero;
-              bool _1013_hasMatchingField;
-              _1013_hasMatchingField = false;
-              while ((_1012_l) < (new BigInteger(((_1009_ctor2).dtor_args).Count))) {
-                DAST._IFormal _1014_formal2;
-                _1014_formal2 = ((_1009_ctor2).dtor_args).Select(_1012_l);
-                if (((_1005_formal).dtor_name).Equals((_1014_formal2).dtor_name)) {
-                  _1013_hasMatchingField = true;
-                }
-                _1010_pattern = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_1010_pattern, DCOMP.__default.escapeIdent((_1014_formal2).dtor_name)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-                _1012_l = (_1012_l) + (BigInteger.One);
-              }
-              _1010_pattern = Dafny.Sequence<Dafny.Rune>.Concat(_1010_pattern, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
-              if (_1013_hasMatchingField) {
-                if ((c).dtor_isCo) {
-                  _1011_rhs = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&"), DCOMP.__default.escapeIdent((_1005_formal).dtor_name)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0)"));
-                } else {
-                  _1011_rhs = Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((_1005_formal).dtor_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""));
-                }
-              } else {
-                _1011_rhs = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("panic!(\"field does not exist on this variant\")");
-              }
-              RAST._IMatchCase _1015_ctorMatch;
-              _1015_ctorMatch = RAST.MatchCase.create(_1010_pattern, RAST.Expr.create_RawExpr(_1011_rhs));
-              _1007_cases = Dafny.Sequence<RAST._IMatchCase>.Concat(_1007_cases, Dafny.Sequence<RAST._IMatchCase>.FromElements(_1015_ctorMatch));
-              _1008_k = (_1008_k) + (BigInteger.One);
-            }
-            if ((new BigInteger(((c).dtor_typeParams).Count)).Sign == 1) {
-              _1007_cases = Dafny.Sequence<RAST._IMatchCase>.Concat(_1007_cases, Dafny.Sequence<RAST._IMatchCase>.FromElements(RAST.MatchCase.create(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::_PhantomVariant(..)")), RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("panic!()")))));
-            }
-            RAST._IExpr _1016_methodBody;
-            _1016_methodBody = RAST.Expr.create_Match(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("self")), _1007_cases);
-            _1001_implBody = Dafny.Sequence<RAST._IImplMember>.Concat(_1001_implBody, Dafny.Sequence<RAST._IImplMember>.FromElements(RAST.ImplMember.create_FnDecl(RAST.__default.PUB, RAST.Fn.create(DCOMP.__default.escapeIdent((_1005_formal).dtor_name), Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(), Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.self), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), _1006_formalType))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Std.Wrappers.Option<RAST._IExpr>.create_Some(_1016_methodBody)))));
-          }
-          _1004_j = (_1004_j) + (BigInteger.One);
-        }
-        _992_i = (_992_i) + (BigInteger.One);
-      }
-      if ((new BigInteger(((c).dtor_typeParams).Count)).Sign == 1) {
-        BigInteger _1017_typeI;
-        _1017_typeI = BigInteger.Zero;
-        Dafny.ISequence<RAST._IType> _1018_types;
-        _1018_types = Dafny.Sequence<RAST._IType>.FromElements();
-        while ((_1017_typeI) < (new BigInteger(((c).dtor_typeParams).Count))) {
-          Dafny.ISequence<Dafny.Rune> _1019_genTp;
-          Dafny.ISequence<Dafny.Rune> _out66;
-          _out66 = DCOMP.COMP.GenType(((c).dtor_typeParams).Select(_1017_typeI), false, false);
-          _1019_genTp = _out66;
-          _1018_types = Dafny.Sequence<RAST._IType>.Concat(_1018_types, Dafny.Sequence<RAST._IType>.FromElements(RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::marker::PhantomData::<"), _1019_genTp), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">")))));
-          _1017_typeI = (_1017_typeI) + (BigInteger.One);
-        }
-        _991_ctors = Dafny.Sequence<RAST._IEnumCase>.Concat(_991_ctors, Dafny.Sequence<RAST._IEnumCase>.FromElements(RAST.EnumCase.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_PhantomVariant"), RAST.Formals.create_NamelessFormals(_1018_types))));
-      }
-      Dafny.ISequence<RAST._IModDecl> _1020_enumBody;
-      _1020_enumBody = Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_EnumDecl(RAST.Enum.create(Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("#[derive(PartialEq)]")), DCOMP.__default.escapeIdent((c).dtor_name), _982_sTypeParams, _991_ctors)), RAST.ModDecl.create_ImplDecl(RAST.Impl.create_Impl(_983_sConstrainedTypeParams, RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), _988_typeParams)), _984_whereConstraints, _1001_implBody)));
-      Dafny.ISequence<RAST._IModDecl> _1021_identEraseImpls;
-      _1021_identEraseImpls = Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_ImplDecl(RAST.Impl.create_ImplFor(_983_sConstrainedTypeParams, RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable")), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), _988_typeParams)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Dafny.Sequence<RAST._IImplMember>.FromElements(RAST.ImplMember.create_RawImplMember(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("type Erased = "), DCOMP.__default.escapeIdent((c).dtor_name)), _987_erasedParams), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";")))))), RAST.ModDecl.create_ImplDecl(RAST.Impl.create_ImplFor(_985_sConstrainedEraseParams, RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyUnerasable<"), DCOMP.__default.escapeIdent((c).dtor_name)), _986_unerasedParams), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">"))), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), _988_typeParams)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Dafny.Sequence<RAST._IImplMember>.FromElements())));
-      _992_i = BigInteger.Zero;
-      Dafny.ISequence<RAST._IMatchCase> _1022_printImplBodyCases;
-      _1022_printImplBodyCases = Dafny.Sequence<RAST._IMatchCase>.FromElements();
-      while ((_992_i) < (new BigInteger(((c).dtor_ctors).Count))) {
-        DAST._IDatatypeCtor _1023_ctor;
-        _1023_ctor = ((c).dtor_ctors).Select(_992_i);
-        Dafny.ISequence<Dafny.Rune> _1024_ctorMatch;
-        _1024_ctorMatch = Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((_1023_ctor).dtor_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" { "));
-        Dafny.ISequence<Dafny.Rune> _1025_modulePrefix;
-        _1025_modulePrefix = (((((c).dtor_enclosingModule)).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_module"))) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")) : (Dafny.Sequence<Dafny.Rune>.Concat(((c).dtor_enclosingModule), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("."))));
-        RAST._IExpr _1026_printRhs;
-        _1026_printRhs = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("write!(_formatter, \""), _1025_modulePrefix), (c).dtor_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent((_1023_ctor).dtor_name)), (((_1023_ctor).dtor_hasAnyArgs) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(\")?")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\")?")))));
-        BigInteger _1027_j;
-        _1027_j = BigInteger.Zero;
-        while ((_1027_j) < (new BigInteger(((_1023_ctor).dtor_args).Count))) {
-          DAST._IFormal _1028_formal;
-          _1028_formal = ((_1023_ctor).dtor_args).Select(_1027_j);
-          _1024_ctorMatch = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_1024_ctorMatch, DCOMP.__default.escapeIdent((_1028_formal).dtor_name)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-          if ((_1027_j).Sign == 1) {
-            _1026_printRhs = (_1026_printRhs).Then(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("write!(_formatter, \", \")?")));
-          }
-          _1026_printRhs = (_1026_printRhs).Then(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyPrint::fmt_print("), DCOMP.__default.escapeIdent((_1028_formal).dtor_name)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", _formatter, false)?"))));
-          _1027_j = (_1027_j) + (BigInteger.One);
-        }
-        _1024_ctorMatch = Dafny.Sequence<Dafny.Rune>.Concat(_1024_ctorMatch, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
-        if ((_1023_ctor).dtor_hasAnyArgs) {
-          _1026_printRhs = (_1026_printRhs).Then(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("write!(_formatter, \")\")?")));
-        }
-        _1026_printRhs = (_1026_printRhs).Then(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Ok(())")));
-        _1022_printImplBodyCases = Dafny.Sequence<RAST._IMatchCase>.Concat(_1022_printImplBodyCases, Dafny.Sequence<RAST._IMatchCase>.FromElements(RAST.MatchCase.create(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::")), _1024_ctorMatch), RAST.Expr.create_Block(_1026_printRhs))));
-        _992_i = (_992_i) + (BigInteger.One);
-      }
-      if ((new BigInteger(((c).dtor_typeParams).Count)).Sign == 1) {
-        _1022_printImplBodyCases = Dafny.Sequence<RAST._IMatchCase>.Concat(_1022_printImplBodyCases, Dafny.Sequence<RAST._IMatchCase>.FromElements(RAST.MatchCase.create(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::_PhantomVariant(..)")), RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("{panic!()}")))));
-      }
-      RAST._IExpr _1029_printImplBody;
-      _1029_printImplBody = RAST.Expr.create_Match(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("self")), _1022_printImplBodyCases);
-      Dafny.ISequence<RAST._IModDecl> _1030_printImpl;
-      _1030_printImpl = Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_ImplDecl(RAST.Impl.create_ImplFor(_983_sConstrainedTypeParams, RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyPrint")), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), _988_typeParams)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Dafny.Sequence<RAST._IImplMember>.FromElements(RAST.ImplMember.create_FnDecl(RAST.__default.PRIV, RAST.Fn.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("fmt_print"), Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(), Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.self, RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_formatter"), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&mut ::std::fmt::Formatter"))), RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_in_seq"), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("bool")))), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("std::fmt::Result"))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Std.Wrappers.Option<RAST._IExpr>.create_Some(_1029_printImplBody)))))));
-      Dafny.ISequence<RAST._IModDecl> _1031_defaultImpl;
-      _1031_defaultImpl = Dafny.Sequence<RAST._IModDecl>.FromElements();
-      if ((new BigInteger(((c).dtor_ctors).Count)).Sign == 1) {
-        _992_i = BigInteger.Zero;
-        Dafny.ISequence<Dafny.Rune> _1032_structName;
-        _1032_structName = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::")), DCOMP.__default.escapeIdent((((c).dtor_ctors).Select(BigInteger.Zero)).dtor_name));
-        Dafny.ISequence<RAST._IAssignIdentifier> _1033_structAssignments;
-        _1033_structAssignments = Dafny.Sequence<RAST._IAssignIdentifier>.FromElements();
-        while ((_992_i) < (new BigInteger(((((c).dtor_ctors).Select(BigInteger.Zero)).dtor_args).Count))) {
-          DAST._IFormal _1034_formal;
-          _1034_formal = ((((c).dtor_ctors).Select(BigInteger.Zero)).dtor_args).Select(_992_i);
-          _1033_structAssignments = Dafny.Sequence<RAST._IAssignIdentifier>.Concat(_1033_structAssignments, Dafny.Sequence<RAST._IAssignIdentifier>.FromElements(RAST.AssignIdentifier.create(DCOMP.__default.escapeIdent((_1034_formal).dtor_name), RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::default::Default::default()")))));
-          _992_i = (_992_i) + (BigInteger.One);
-        }
-        _1031_defaultImpl = Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_ImplDecl(RAST.Impl.create_ImplFor(_983_sConstrainedTypeParams, RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::default::Default")), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), _988_typeParams)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Dafny.Sequence<RAST._IImplMember>.FromElements(RAST.ImplMember.create_FnDecl(RAST.__default.PRIV, RAST.Fn.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("default"), Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(), Dafny.Sequence<RAST._IFormal>.FromElements(), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_SelfOwned()), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Std.Wrappers.Option<RAST._IExpr>.create_Some(RAST.Expr.create_StructBuild(_1032_structName, _1033_structAssignments))))))));
-      }
-      s = Dafny.Sequence<RAST._IModDecl>.Concat(Dafny.Sequence<RAST._IModDecl>.Concat(Dafny.Sequence<RAST._IModDecl>.Concat(_1020_enumBody, _1021_identEraseImpls), _1030_printImpl), _1031_defaultImpl);
-      return s;
-    }
-    public static Dafny.ISequence<Dafny.Rune> GenPath(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> p) {
-      Dafny.ISequence<Dafny.Rune> s = Dafny.Sequence<Dafny.Rune>.Empty;
-      if ((new BigInteger((p).Count)).Sign == 0) {
-        s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Self");
-        return s;
-      } else {
-        s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("super::");
-        BigInteger _1035_i;
-        _1035_i = BigInteger.Zero;
-        while ((_1035_i) < (new BigInteger((p).Count))) {
-          if ((_1035_i).Sign == 1) {
-            s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::"));
-          }
-          s = Dafny.Sequence<Dafny.Rune>.Concat(s, DCOMP.__default.escapeIdent(((p).Select(_1035_i))));
-          _1035_i = (_1035_i) + (BigInteger.One);
-        }
-      }
-      return s;
-    }
-    public static Dafny.ISequence<Dafny.Rune> GenTypeArgs(Dafny.ISequence<DAST._IType> args, bool inBinding, bool inFn) {
-      Dafny.ISequence<Dafny.Rune> s = Dafny.Sequence<Dafny.Rune>.Empty;
-      s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-      if ((new BigInteger((args).Count)).Sign == 1) {
-        s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"));
-        BigInteger _1036_i;
-        _1036_i = BigInteger.Zero;
-        while ((_1036_i) < (new BigInteger((args).Count))) {
-          if ((_1036_i).Sign == 1) {
-            s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-          }
-          Dafny.ISequence<Dafny.Rune> _1037_genTp;
-          Dafny.ISequence<Dafny.Rune> _out67;
-          _out67 = DCOMP.COMP.GenType((args).Select(_1036_i), inBinding, inFn);
-          _1037_genTp = _out67;
-          s = Dafny.Sequence<Dafny.Rune>.Concat(s, _1037_genTp);
-          _1036_i = (_1036_i) + (BigInteger.One);
-        }
-        s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">"));
-      }
-      return s;
-    }
-    public static Dafny.ISequence<Dafny.Rune> GenType(DAST._IType c, bool inBinding, bool inFn) {
-      Dafny.ISequence<Dafny.Rune> s = Dafny.Sequence<Dafny.Rune>.Empty;
-      DAST._IType _source33 = c;
-      if (_source33.is_Path) {
-        Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1038___mcc_h0 = _source33.dtor_Path_a0;
-        Dafny.ISequence<DAST._IType> _1039___mcc_h1 = _source33.dtor_typeArgs;
-        DAST._IResolvedType _1040___mcc_h2 = _source33.dtor_resolved;
-        DAST._IResolvedType _1041_resolved = _1040___mcc_h2;
-        Dafny.ISequence<DAST._IType> _1042_args = _1039___mcc_h1;
-        Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1043_p = _1038___mcc_h0;
-        Dafny.ISequence<Dafny.Rune> _out68;
-        _out68 = DCOMP.COMP.GenPath(_1043_p);
-        s = _out68;
-        Dafny.ISequence<Dafny.Rune> _1044_typeArgs;
-        Dafny.ISequence<Dafny.Rune> _out69;
-        _out69 = DCOMP.COMP.GenTypeArgs(_1042_args, inBinding, inFn);
-        _1044_typeArgs = _out69;
-        s = Dafny.Sequence<Dafny.Rune>.Concat(s, _1044_typeArgs);
-        DAST._IResolvedType _source34 = _1041_resolved;
-        if (_source34.is_Datatype) {
-          Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1045___mcc_h18 = _source34.dtor_path;
-          s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc<"), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">"));
-        } else if (_source34.is_Trait) {
-          Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1046___mcc_h20 = _source34.dtor_path;
-          if ((_1043_p).Equals(Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_System"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("object")))) {
-            s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc<dyn ::std::any::Any>");
-          } else {
-            if (inBinding) {
-              s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_");
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("impl "), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""));
-            }
-          }
-        } else {
-          DAST._IType _1047___mcc_h22 = _source34.dtor_Newtype_a0;
-        }
-      } else if (_source33.is_Nullable) {
-        DAST._IType _1048___mcc_h3 = _source33.dtor_Nullable_a0;
-        DAST._IType _1049_inner = _1048___mcc_h3;
-        Dafny.ISequence<Dafny.Rune> _1050_innerStr;
-        Dafny.ISequence<Dafny.Rune> _out70;
-        _out70 = DCOMP.COMP.GenType(_1049_inner, inBinding, inFn);
-        _1050_innerStr = _out70;
-        s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::option::Option<"), _1050_innerStr), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">"));
-      } else if (_source33.is_Tuple) {
-        Dafny.ISequence<DAST._IType> _1051___mcc_h4 = _source33.dtor_Tuple_a0;
-        Dafny.ISequence<DAST._IType> _1052_types = _1051___mcc_h4;
-        s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(");
-        BigInteger _hi4 = new BigInteger((_1052_types).Count);
-        for (BigInteger _1053_i = BigInteger.Zero; _1053_i < _hi4; _1053_i++) {
-          if ((_1053_i).Sign == 1) {
-            s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" "));
-          }
-          Dafny.ISequence<Dafny.Rune> _1054_generated;
-          Dafny.ISequence<Dafny.Rune> _out71;
-          _out71 = DCOMP.COMP.GenType((_1052_types).Select(_1053_i), inBinding, inFn);
-          _1054_generated = _out71;
-          s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(s, _1054_generated), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(","));
-        }
-        s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-      } else if (_source33.is_Array) {
-        DAST._IType _1055___mcc_h5 = _source33.dtor_element;
-        BigInteger _1056___mcc_h6 = _source33.dtor_dims;
-        BigInteger _1057_dims = _1056___mcc_h6;
-        DAST._IType _1058_element = _1055___mcc_h5;
-        Dafny.ISequence<Dafny.Rune> _1059_elemStr;
-        Dafny.ISequence<Dafny.Rune> _out72;
-        _out72 = DCOMP.COMP.GenType(_1058_element, inBinding, inFn);
-        _1059_elemStr = _out72;
-        s = _1059_elemStr;
-        BigInteger _hi5 = _1057_dims;
-        for (BigInteger _1060_i = BigInteger.Zero; _1060_i < _hi5; _1060_i++) {
-          s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc<::std::cell::RefCell<::std::vec::Vec<"), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">>>"));
-        }
-      } else if (_source33.is_Seq) {
-        DAST._IType _1061___mcc_h7 = _source33.dtor_element;
-        DAST._IType _1062_element = _1061___mcc_h7;
-        Dafny.ISequence<Dafny.Rune> _1063_elemStr;
-        Dafny.ISequence<Dafny.Rune> _out73;
-        _out73 = DCOMP.COMP.GenType(_1062_element, inBinding, inFn);
-        _1063_elemStr = _out73;
-        s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::vec::Vec<"), _1063_elemStr), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">"));
-      } else if (_source33.is_Set) {
-        DAST._IType _1064___mcc_h8 = _source33.dtor_element;
-        DAST._IType _1065_element = _1064___mcc_h8;
-        Dafny.ISequence<Dafny.Rune> _1066_elemStr;
-        Dafny.ISequence<Dafny.Rune> _out74;
-        _out74 = DCOMP.COMP.GenType(_1065_element, inBinding, inFn);
-        _1066_elemStr = _out74;
-        s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::collections::HashSet<"), _1066_elemStr), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">"));
-      } else if (_source33.is_Multiset) {
-        DAST._IType _1067___mcc_h9 = _source33.dtor_element;
-        DAST._IType _1068_element = _1067___mcc_h9;
-        Dafny.ISequence<Dafny.Rune> _1069_elemStr;
-        Dafny.ISequence<Dafny.Rune> _out75;
-        _out75 = DCOMP.COMP.GenType(_1068_element, inBinding, inFn);
-        _1069_elemStr = _out75;
-        s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::collections::HashMap<"), _1069_elemStr), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", u64>"));
-      } else if (_source33.is_Map) {
-        DAST._IType _1070___mcc_h10 = _source33.dtor_key;
-        DAST._IType _1071___mcc_h11 = _source33.dtor_value;
-        DAST._IType _1072_value = _1071___mcc_h11;
-        DAST._IType _1073_key = _1070___mcc_h10;
-        Dafny.ISequence<Dafny.Rune> _1074_keyStr;
-        Dafny.ISequence<Dafny.Rune> _out76;
-        _out76 = DCOMP.COMP.GenType(_1073_key, inBinding, inFn);
-        _1074_keyStr = _out76;
-        Dafny.ISequence<Dafny.Rune> _1075_valueStr;
-        Dafny.ISequence<Dafny.Rune> _out77;
-        _out77 = DCOMP.COMP.GenType(_1072_value, inBinding, inFn);
-        _1075_valueStr = _out77;
-        s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::collections::HashMap<"), _1074_keyStr), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _1075_valueStr), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">"));
-      } else if (_source33.is_Arrow) {
-        Dafny.ISequence<DAST._IType> _1076___mcc_h12 = _source33.dtor_args;
-        DAST._IType _1077___mcc_h13 = _source33.dtor_result;
-        DAST._IType _1078_result = _1077___mcc_h13;
-        Dafny.ISequence<DAST._IType> _1079_args = _1076___mcc_h12;
-        s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::FunctionWrapper<::std::rc::Rc<dyn ::std::ops::Fn(");
-        BigInteger _hi6 = new BigInteger((_1079_args).Count);
-        for (BigInteger _1080_i = BigInteger.Zero; _1080_i < _hi6; _1080_i++) {
-          if ((_1080_i).Sign == 1) {
-            s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-          }
-          Dafny.ISequence<Dafny.Rune> _1081_generated;
-          Dafny.ISequence<Dafny.Rune> _out78;
-          _out78 = DCOMP.COMP.GenType((_1079_args).Select(_1080_i), inBinding, true);
-          _1081_generated = _out78;
-          s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&")), _1081_generated);
-        }
-        Dafny.ISequence<Dafny.Rune> _1082_resultType;
-        Dafny.ISequence<Dafny.Rune> _out79;
-        _out79 = DCOMP.COMP.GenType(_1078_result, inBinding, (inFn) || (inBinding));
-        _1082_resultType = _out79;
-        s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") -> ")), _1082_resultType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" + 'static>>"));
-      } else if (_source33.is_Primitive) {
-        DAST._IPrimitive _1083___mcc_h14 = _source33.dtor_Primitive_a0;
-        DAST._IPrimitive _1084_p = _1083___mcc_h14;
-        DAST._IPrimitive _source35 = _1084_p;
-        if (_source35.is_Int) {
-          s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::BigInt");
-        } else if (_source35.is_Real) {
-          s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::BigRational");
-        } else if (_source35.is_String) {
-          s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Vec<char>");
-        } else if (_source35.is_Bool) {
-          s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("bool");
-        } else {
-          s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("char");
-        }
-      } else if (_source33.is_Passthrough) {
-        Dafny.ISequence<Dafny.Rune> _1085___mcc_h15 = _source33.dtor_Passthrough_a0;
-        Dafny.ISequence<Dafny.Rune> _1086_v = _1085___mcc_h15;
-        s = _1086_v;
-      } else {
-        Dafny.ISequence<Dafny.Rune> _1087___mcc_h16 = _source33.dtor_TypeArg_a0;
-        Dafny.ISequence<Dafny.Rune> _source36 = _1087___mcc_h16;
-        Dafny.ISequence<Dafny.Rune> _1088___mcc_h17 = _source36;
-        Dafny.ISequence<Dafny.Rune> _1089_name = _1088___mcc_h17;
-        s = DCOMP.__default.escapeIdent(_1089_name);
-      }
-      return s;
-    }
-    public static void GenClassImplBody(Dafny.ISequence<DAST._IMethod> body, bool forTrait, DAST._IType enclosingType, Dafny.ISet<DAST._IType> enclosingTypeParams, out Dafny.ISequence<RAST._IImplMember> s, out Dafny.IMap<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>, Dafny.ISequence<RAST._IImplMember>> traitBodies) {
-      s = Dafny.Sequence<RAST._IImplMember>.Empty;
-      traitBodies = Dafny.Map<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>, Dafny.ISequence<RAST._IImplMember>>.Empty;
-      s = Dafny.Sequence<RAST._IImplMember>.FromElements();
-      traitBodies = Dafny.Map<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>, Dafny.ISequence<RAST._IImplMember>>.FromElements();
-      BigInteger _1090_i;
-      _1090_i = BigInteger.Zero;
-      while ((_1090_i) < (new BigInteger((body).Count))) {
-        DAST._IMethod _source37 = (body).Select(_1090_i);
-        DAST._IMethod _1091___mcc_h0 = _source37;
-        DAST._IMethod _1092_m = _1091___mcc_h0;
-        {
-          Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> _source38 = (_1092_m).dtor_overridingPath;
-          if (_source38.is_None) {
-            {
-              RAST._IImplMember _1093_generated;
-              RAST._IImplMember _out80;
-              _out80 = DCOMP.COMP.GenMethod(_1092_m, forTrait, enclosingType, enclosingTypeParams);
-              _1093_generated = _out80;
-              s = Dafny.Sequence<RAST._IImplMember>.Concat(s, Dafny.Sequence<RAST._IImplMember>.FromElements(_1093_generated));
-            }
-          } else {
-            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1094___mcc_h1 = _source38.dtor_value;
-            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1095_p = _1094___mcc_h1;
-            {
-              Dafny.ISequence<RAST._IImplMember> _1096_existing;
-              _1096_existing = Dafny.Sequence<RAST._IImplMember>.FromElements();
-              if ((traitBodies).Contains(_1095_p)) {
-                _1096_existing = Dafny.Map<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>, Dafny.ISequence<RAST._IImplMember>>.Select(traitBodies, _1095_p);
-              }
-              RAST._IImplMember _1097_genMethod;
-              RAST._IImplMember _out81;
-              _out81 = DCOMP.COMP.GenMethod(_1092_m, true, enclosingType, enclosingTypeParams);
-              _1097_genMethod = _out81;
-              _1096_existing = Dafny.Sequence<RAST._IImplMember>.Concat(_1096_existing, Dafny.Sequence<RAST._IImplMember>.FromElements(_1097_genMethod));
-              traitBodies = Dafny.Map<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>, Dafny.ISequence<RAST._IImplMember>>.Merge(traitBodies, Dafny.Map<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>, Dafny.ISequence<RAST._IImplMember>>.FromElements(new Dafny.Pair<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>, Dafny.ISequence<RAST._IImplMember>>(_1095_p, _1096_existing)));
-            }
-          }
-        }
-        _1090_i = (_1090_i) + (BigInteger.One);
-      }
-    }
-    public static Dafny.ISequence<RAST._IFormal> GenParams(Dafny.ISequence<DAST._IFormal> @params) {
-      Dafny.ISequence<RAST._IFormal> s = Dafny.Sequence<RAST._IFormal>.Empty;
-      s = Dafny.Sequence<RAST._IFormal>.FromElements();
-      BigInteger _1098_i;
-      _1098_i = BigInteger.Zero;
-      while ((_1098_i) < (new BigInteger((@params).Count))) {
-        DAST._IFormal _1099_param;
-        _1099_param = (@params).Select(_1098_i);
-        Dafny.ISequence<Dafny.Rune> _1100_paramType;
-        Dafny.ISequence<Dafny.Rune> _out82;
-        _out82 = DCOMP.COMP.GenType((_1099_param).dtor_typ, false, false);
-        _1100_paramType = _out82;
-        s = Dafny.Sequence<RAST._IFormal>.Concat(s, Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.create(DCOMP.__default.escapeIdent((_1099_param).dtor_name), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" &"), _1100_paramType)))));
-        _1098_i = (_1098_i) + (BigInteger.One);
-      }
-      return s;
-    }
-    public static RAST._IImplMember GenMethod(DAST._IMethod m, bool forTrait, DAST._IType enclosingType, Dafny.ISet<DAST._IType> enclosingTypeParams) {
-      RAST._IImplMember s = RAST.ImplMember.Default();
-      Dafny.ISequence<RAST._IFormal> _1101_params;
-      Dafny.ISequence<RAST._IFormal> _out83;
-      _out83 = DCOMP.COMP.GenParams((m).dtor_params);
-      _1101_params = _out83;
-      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1102_paramNames;
-      _1102_paramNames = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements();
-      BigInteger _1103_paramI;
-      _1103_paramI = BigInteger.Zero;
-      while ((_1103_paramI) < (new BigInteger(((m).dtor_params).Count))) {
-        _1102_paramNames = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Concat(_1102_paramNames, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements((((m).dtor_params).Select(_1103_paramI)).dtor_name));
-        _1103_paramI = (_1103_paramI) + (BigInteger.One);
-      }
-      if (!((m).dtor_isStatic)) {
-        if (forTrait) {
-          _1101_params = Dafny.Sequence<RAST._IFormal>.Concat(Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.self), _1101_params);
-        } else {
-          Dafny.ISequence<Dafny.Rune> _1104_enclosingTypeString;
-          Dafny.ISequence<Dafny.Rune> _out84;
-          _out84 = DCOMP.COMP.GenType(enclosingType, false, false);
-          _1104_enclosingTypeString = _out84;
-          _1101_params = Dafny.Sequence<RAST._IFormal>.Concat(Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("self"), RAST.Type.create_RawType(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), _1104_enclosingTypeString)))), _1101_params);
-        }
-      }
-      Dafny.ISequence<Dafny.Rune> _1105_retType;
-      _1105_retType = (((new BigInteger(((m).dtor_outTypes).Count)) != (BigInteger.One)) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")));
-      BigInteger _1106_typeI;
-      _1106_typeI = BigInteger.Zero;
-      while ((_1106_typeI) < (new BigInteger(((m).dtor_outTypes).Count))) {
-        if ((_1106_typeI).Sign == 1) {
-          _1105_retType = Dafny.Sequence<Dafny.Rune>.Concat(_1105_retType, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-        }
-        Dafny.ISequence<Dafny.Rune> _1107_typeString;
-        Dafny.ISequence<Dafny.Rune> _out85;
-        _out85 = DCOMP.COMP.GenType(((m).dtor_outTypes).Select(_1106_typeI), false, false);
-        _1107_typeString = _out85;
-        _1105_retType = Dafny.Sequence<Dafny.Rune>.Concat(_1105_retType, _1107_typeString);
-        _1106_typeI = (_1106_typeI) + (BigInteger.One);
-      }
-      if ((new BigInteger(((m).dtor_outTypes).Count)) != (BigInteger.One)) {
-        _1105_retType = Dafny.Sequence<Dafny.Rune>.Concat(_1105_retType, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-      }
-      byte _1108_visibility;
-      _1108_visibility = RAST.__default.PUB;
-      Dafny.ISequence<Dafny.Rune> _1109_fnName;
-      _1109_fnName = DCOMP.__default.escapeIdent((m).dtor_name);
-      Dafny.ISequence<DAST._IType> _1110_typeParamsFiltered;
-      _1110_typeParamsFiltered = Dafny.Sequence<DAST._IType>.FromElements();
-      BigInteger _1111_typeParamI;
-      _1111_typeParamI = BigInteger.Zero;
-      while ((_1111_typeParamI) < (new BigInteger(((m).dtor_typeParams).Count))) {
-        DAST._IType _1112_typeParam;
-        _1112_typeParam = ((m).dtor_typeParams).Select(_1111_typeParamI);
-        if (!((enclosingTypeParams).Contains(_1112_typeParam))) {
-          _1110_typeParamsFiltered = Dafny.Sequence<DAST._IType>.Concat(_1110_typeParamsFiltered, Dafny.Sequence<DAST._IType>.FromElements(_1112_typeParam));
-        }
-        _1111_typeParamI = (_1111_typeParamI) + (BigInteger.One);
-      }
-      Dafny.ISequence<Dafny.Rune> _1113_whereClauses;
-      _1113_whereClauses = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1114_typeParams;
-      _1114_typeParams = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements();
-      if ((new BigInteger((_1110_typeParamsFiltered).Count)).Sign == 1) {
-        _1113_whereClauses = Dafny.Sequence<Dafny.Rune>.Concat(_1113_whereClauses, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" where "));
-        BigInteger _1115_i;
-        _1115_i = BigInteger.Zero;
-        while ((_1115_i) < (new BigInteger((_1110_typeParamsFiltered).Count))) {
-          if ((_1115_i).Sign == 1) {
-            _1113_whereClauses = Dafny.Sequence<Dafny.Rune>.Concat(_1113_whereClauses, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-          }
-          Dafny.ISequence<Dafny.Rune> _1116_typeString;
-          Dafny.ISequence<Dafny.Rune> _out86;
-          _out86 = DCOMP.COMP.GenType((_1110_typeParamsFiltered).Select(_1115_i), false, false);
-          _1116_typeString = _out86;
-          _1114_typeParams = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Concat(_1114_typeParams, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_1116_typeString, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(": ::dafny_runtime::DafnyErasable + ::dafny_runtime::DafnyUnerasable<")), _1116_typeString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("> + Clone + ::dafny_runtime::DafnyPrint + ::std::default::Default + 'static"))));
-          _1113_whereClauses = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_1113_whereClauses, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<")), _1116_typeString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ::dafny_runtime::DafnyErasable>::Erased: ::std::cmp::PartialEq"));
-          _1115_i = (_1115_i) + (BigInteger.One);
-        }
-      }
-      Std.Wrappers._IOption<RAST._IExpr> _1117_fBody = Std.Wrappers.Option<RAST._IExpr>.Default();
-      if ((m).dtor_hasBody) {
-        Dafny.ISequence<Dafny.Rune> _1118_earlyReturn;
-        _1118_earlyReturn = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("return;");
-        Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> _source39 = (m).dtor_outVars;
-        if (_source39.is_None) {
-        } else {
-          Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1119___mcc_h0 = _source39.dtor_value;
-          Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1120_outVars = _1119___mcc_h0;
-          {
-            _1118_earlyReturn = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("return (");
-            BigInteger _1121_outI;
-            _1121_outI = BigInteger.Zero;
-            while ((_1121_outI) < (new BigInteger((_1120_outVars).Count))) {
-              if ((_1121_outI).Sign == 1) {
-                _1118_earlyReturn = Dafny.Sequence<Dafny.Rune>.Concat(_1118_earlyReturn, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-              }
-              Dafny.ISequence<Dafny.Rune> _1122_outVar;
-              _1122_outVar = (_1120_outVars).Select(_1121_outI);
-              _1118_earlyReturn = Dafny.Sequence<Dafny.Rune>.Concat(_1118_earlyReturn, DCOMP.__default.escapeIdent((_1122_outVar)));
-              _1121_outI = (_1121_outI) + (BigInteger.One);
-            }
-            _1118_earlyReturn = Dafny.Sequence<Dafny.Rune>.Concat(_1118_earlyReturn, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(");"));
-          }
-        }
-        Dafny.ISequence<Dafny.Rune> _1123_body;
-        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1124___v15;
-        Dafny.ISequence<Dafny.Rune> _out87;
-        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out88;
-        DCOMP.COMP.GenStmts((m).dtor_body, (((m).dtor_isStatic) ? (Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None()) : (Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_Some(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("self")))), _1102_paramNames, true, _1118_earlyReturn, out _out87, out _out88);
-        _1123_body = _out87;
-        _1124___v15 = _out88;
-        _1117_fBody = Std.Wrappers.Option<RAST._IExpr>.create_Some(RAST.Expr.create_RawExpr(_1123_body));
-      } else {
-        _1117_fBody = Std.Wrappers.Option<RAST._IExpr>.create_None();
-      }
-      s = RAST.ImplMember.create_FnDecl(_1108_visibility, RAST.Fn.create(_1109_fnName, _1114_typeParams, _1101_params, Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_RawType(_1105_retType)), _1113_whereClauses, _1117_fBody));
-      return s;
-    }
-    public static void GenStmts(Dafny.ISequence<DAST._IStatement> stmts, Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> selfIdent, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> @params, bool isLast, Dafny.ISequence<Dafny.Rune> earlyReturn, out Dafny.ISequence<Dafny.Rune> generated, out Dafny.ISet<Dafny.ISequence<Dafny.Rune>> readIdents) {
-      generated = Dafny.Sequence<Dafny.Rune>.Empty;
-      readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Empty;
-      generated = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1125_declarations;
-      _1125_declarations = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-      readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-      BigInteger _1126_i;
-      _1126_i = BigInteger.Zero;
-      while ((_1126_i) < (new BigInteger((stmts).Count))) {
-        DAST._IStatement _1127_stmt;
-        _1127_stmt = (stmts).Select(_1126_i);
-        Dafny.ISequence<Dafny.Rune> _1128_stmtString;
-        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1129_recIdents;
-        Dafny.ISequence<Dafny.Rune> _out89;
-        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out90;
-        DCOMP.COMP.GenStmt(_1127_stmt, selfIdent, @params, (isLast) && ((_1126_i) == ((new BigInteger((stmts).Count)) - (BigInteger.One))), earlyReturn, out _out89, out _out90);
-        _1128_stmtString = _out89;
-        _1129_recIdents = _out90;
-        readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Difference(_1129_recIdents, _1125_declarations));
-        DAST._IStatement _source40 = _1127_stmt;
-        if (_source40.is_DeclareVar) {
-          Dafny.ISequence<Dafny.Rune> _1130___mcc_h0 = _source40.dtor_name;
-          DAST._IType _1131___mcc_h1 = _source40.dtor_typ;
-          Std.Wrappers._IOption<DAST._IExpression> _1132___mcc_h2 = _source40.dtor_maybeValue;
-          Dafny.ISequence<Dafny.Rune> _1133_name = _1130___mcc_h0;
-          {
-            _1125_declarations = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(_1125_declarations, Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements(_1133_name));
-          }
-        } else if (_source40.is_Assign) {
-          DAST._IAssignLhs _1134___mcc_h6 = _source40.dtor_lhs;
-          DAST._IExpression _1135___mcc_h7 = _source40.dtor_value;
-        } else if (_source40.is_If) {
-          DAST._IExpression _1136___mcc_h10 = _source40.dtor_cond;
-          Dafny.ISequence<DAST._IStatement> _1137___mcc_h11 = _source40.dtor_thn;
-          Dafny.ISequence<DAST._IStatement> _1138___mcc_h12 = _source40.dtor_els;
-        } else if (_source40.is_Labeled) {
-          Dafny.ISequence<Dafny.Rune> _1139___mcc_h16 = _source40.dtor_lbl;
-          Dafny.ISequence<DAST._IStatement> _1140___mcc_h17 = _source40.dtor_body;
-        } else if (_source40.is_While) {
-          DAST._IExpression _1141___mcc_h20 = _source40.dtor_cond;
-          Dafny.ISequence<DAST._IStatement> _1142___mcc_h21 = _source40.dtor_body;
-        } else if (_source40.is_Foreach) {
-          Dafny.ISequence<Dafny.Rune> _1143___mcc_h24 = _source40.dtor_boundName;
-          DAST._IType _1144___mcc_h25 = _source40.dtor_boundType;
-          DAST._IExpression _1145___mcc_h26 = _source40.dtor_over;
-          Dafny.ISequence<DAST._IStatement> _1146___mcc_h27 = _source40.dtor_body;
-        } else if (_source40.is_Call) {
-          DAST._IExpression _1147___mcc_h32 = _source40.dtor_on;
-          Dafny.ISequence<Dafny.Rune> _1148___mcc_h33 = _source40.dtor_name;
-          Dafny.ISequence<DAST._IType> _1149___mcc_h34 = _source40.dtor_typeArgs;
-          Dafny.ISequence<DAST._IExpression> _1150___mcc_h35 = _source40.dtor_args;
-          Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> _1151___mcc_h36 = _source40.dtor_outs;
-        } else if (_source40.is_Return) {
-          DAST._IExpression _1152___mcc_h42 = _source40.dtor_expr;
-        } else if (_source40.is_EarlyReturn) {
-        } else if (_source40.is_Break) {
-          Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1153___mcc_h44 = _source40.dtor_toLabel;
-        } else if (_source40.is_TailRecursive) {
-          Dafny.ISequence<DAST._IStatement> _1154___mcc_h46 = _source40.dtor_body;
-        } else if (_source40.is_JumpTailCallStart) {
-        } else if (_source40.is_Halt) {
-        } else {
-          DAST._IExpression _1155___mcc_h48 = _source40.dtor_Print_a0;
-        }
-        if ((_1126_i).Sign == 1) {
-          generated = Dafny.Sequence<Dafny.Rune>.Concat(generated, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"));
-        }
-        generated = Dafny.Sequence<Dafny.Rune>.Concat(generated, _1128_stmtString);
-        _1126_i = (_1126_i) + (BigInteger.One);
-      }
-    }
-    public static void GenAssignLhs(DAST._IAssignLhs lhs, Dafny.ISequence<Dafny.Rune> rhs, Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> selfIdent, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> @params, out Dafny.ISequence<Dafny.Rune> generated, out bool needsIIFE, out Dafny.ISet<Dafny.ISequence<Dafny.Rune>> readIdents) {
-      generated = Dafny.Sequence<Dafny.Rune>.Empty;
-      needsIIFE = false;
-      readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Empty;
-      DAST._IAssignLhs _source41 = lhs;
-      if (_source41.is_Ident) {
-        Dafny.ISequence<Dafny.Rune> _1156___mcc_h0 = _source41.dtor_Ident_a0;
-        Dafny.ISequence<Dafny.Rune> _source42 = _1156___mcc_h0;
-        Dafny.ISequence<Dafny.Rune> _1157___mcc_h1 = _source42;
-        Dafny.ISequence<Dafny.Rune> _1158_id = _1157___mcc_h1;
-        {
-          if ((@params).Contains(_1158_id)) {
-            generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("*"), DCOMP.__default.escapeIdent(_1158_id));
-          } else {
-            generated = DCOMP.__default.escapeIdent(_1158_id);
-          }
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements(_1158_id);
-          needsIIFE = false;
-        }
-      } else if (_source41.is_Select) {
-        DAST._IExpression _1159___mcc_h2 = _source41.dtor_expr;
-        Dafny.ISequence<Dafny.Rune> _1160___mcc_h3 = _source41.dtor_field;
-        Dafny.ISequence<Dafny.Rune> _1161_field = _1160___mcc_h3;
-        DAST._IExpression _1162_on = _1159___mcc_h2;
-        {
-          Dafny.ISequence<Dafny.Rune> _1163_onExpr;
-          bool _1164_onOwned;
-          bool _1165_onErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1166_recIdents;
-          Dafny.ISequence<Dafny.Rune> _out91;
-          bool _out92;
-          bool _out93;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out94;
-          DCOMP.COMP.GenExpr(_1162_on, selfIdent, @params, false, out _out91, out _out92, out _out93, out _out94);
-          _1163_onExpr = _out91;
-          _1164_onOwned = _out92;
-          _1165_onErased = _out93;
-          _1166_recIdents = _out94;
-          generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("*("), _1163_onExpr), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), _1161_field), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow_mut()) = ")), rhs), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";"));
-          readIdents = _1166_recIdents;
-          needsIIFE = true;
-        }
-      } else {
-        DAST._IExpression _1167___mcc_h4 = _source41.dtor_expr;
-        Dafny.ISequence<DAST._IExpression> _1168___mcc_h5 = _source41.dtor_indices;
-        Dafny.ISequence<DAST._IExpression> _1169_indices = _1168___mcc_h5;
-        DAST._IExpression _1170_on = _1167___mcc_h4;
-        {
-          Dafny.ISequence<Dafny.Rune> _1171_onExpr;
-          bool _1172_onOwned;
-          bool _1173_onErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1174_recIdents;
-          Dafny.ISequence<Dafny.Rune> _out95;
-          bool _out96;
-          bool _out97;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out98;
-          DCOMP.COMP.GenExpr(_1170_on, selfIdent, @params, false, out _out95, out _out96, out _out97, out _out98);
-          _1171_onExpr = _out95;
-          _1172_onOwned = _out96;
-          _1173_onErased = _out97;
-          _1174_recIdents = _out98;
-          readIdents = _1174_recIdents;
-          generated = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("{\n");
-          BigInteger _1175_i;
-          _1175_i = BigInteger.Zero;
-          while ((_1175_i) < (new BigInteger((_1169_indices).Count))) {
-            Dafny.ISequence<Dafny.Rune> _1176_idx;
-            bool _1177___v19;
-            bool _1178_idxErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1179_recIdentsIdx;
-            Dafny.ISequence<Dafny.Rune> _out99;
-            bool _out100;
-            bool _out101;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out102;
-            DCOMP.COMP.GenExpr((_1169_indices).Select(_1175_i), selfIdent, @params, true, out _out99, out _out100, out _out101, out _out102);
-            _1176_idx = _out99;
-            _1177___v19 = _out100;
-            _1178_idxErased = _out101;
-            _1179_recIdentsIdx = _out102;
-            if (!(_1178_idxErased)) {
-              _1176_idx = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _1176_idx), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            }
-            generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(generated, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("let __idx")), Std.Strings.__default.OfNat(_1175_i)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" = <usize as ::dafny_runtime::NumCast>::from(")), _1176_idx), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").unwrap();\n"));
-            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _1179_recIdentsIdx);
-            _1175_i = (_1175_i) + (BigInteger.One);
-          }
-          generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(generated, _1171_onExpr), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow_mut()"));
-          _1175_i = BigInteger.Zero;
-          while ((_1175_i) < (new BigInteger((_1169_indices).Count))) {
-            generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(generated, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("[__idx")), Std.Strings.__default.OfNat(_1175_i)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("]"));
-            _1175_i = (_1175_i) + (BigInteger.One);
-          }
-          generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(generated, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" = ")), rhs), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";\n}"));
-          needsIIFE = true;
-        }
-      }
-    }
-    public static void GenStmt(DAST._IStatement stmt, Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> selfIdent, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> @params, bool isLast, Dafny.ISequence<Dafny.Rune> earlyReturn, out Dafny.ISequence<Dafny.Rune> generated, out Dafny.ISet<Dafny.ISequence<Dafny.Rune>> readIdents) {
-      generated = Dafny.Sequence<Dafny.Rune>.Empty;
-      readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Empty;
-      DAST._IStatement _source43 = stmt;
-      if (_source43.is_DeclareVar) {
-        Dafny.ISequence<Dafny.Rune> _1180___mcc_h0 = _source43.dtor_name;
-        DAST._IType _1181___mcc_h1 = _source43.dtor_typ;
-        Std.Wrappers._IOption<DAST._IExpression> _1182___mcc_h2 = _source43.dtor_maybeValue;
-        Std.Wrappers._IOption<DAST._IExpression> _source44 = _1182___mcc_h2;
-        if (_source44.is_None) {
-          DAST._IType _1183_typ = _1181___mcc_h1;
-          Dafny.ISequence<Dafny.Rune> _1184_name = _1180___mcc_h0;
-          {
-            Dafny.ISequence<Dafny.Rune> _1185_typeString;
-            Dafny.ISequence<Dafny.Rune> _out103;
-            _out103 = DCOMP.COMP.GenType(_1183_typ, true, false);
-            _1185_typeString = _out103;
-            generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("let mut "), DCOMP.__default.escapeIdent(_1184_name)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(": ")), _1185_typeString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";"));
-            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-          }
-        } else {
-          DAST._IExpression _1186___mcc_h3 = _source44.dtor_value;
-          DAST._IExpression _1187_expression = _1186___mcc_h3;
-          DAST._IType _1188_typ = _1181___mcc_h1;
-          Dafny.ISequence<Dafny.Rune> _1189_name = _1180___mcc_h0;
-          {
-            Dafny.ISequence<Dafny.Rune> _1190_typeString;
-            Dafny.ISequence<Dafny.Rune> _out104;
-            _out104 = DCOMP.COMP.GenType(_1188_typ, true, false);
-            _1190_typeString = _out104;
-            Dafny.ISequence<Dafny.Rune> _1191_expr;
-            bool _1192___v20;
-            bool _1193_recErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1194_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out105;
-            bool _out106;
-            bool _out107;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out108;
-            DCOMP.COMP.GenExpr(_1187_expression, selfIdent, @params, true, out _out105, out _out106, out _out107, out _out108);
-            _1191_expr = _out105;
-            _1192___v20 = _out106;
-            _1193_recErased = _out107;
-            _1194_recIdents = _out108;
-            if (!(_1193_recErased)) {
-              _1191_expr = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _1191_expr), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            }
-            _1191_expr = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _1190_typeString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ::dafny_runtime::DafnyUnerasable<_>>::unerase_owned(")), _1191_expr), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("let mut "), DCOMP.__default.escapeIdent(_1189_name)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(": ")), _1190_typeString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" = ")), _1191_expr), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";"));
-            readIdents = _1194_recIdents;
-          }
-        }
-      } else if (_source43.is_Assign) {
-        DAST._IAssignLhs _1195___mcc_h4 = _source43.dtor_lhs;
-        DAST._IExpression _1196___mcc_h5 = _source43.dtor_value;
-        DAST._IExpression _1197_expression = _1196___mcc_h5;
-        DAST._IAssignLhs _1198_lhs = _1195___mcc_h4;
-        {
-          Dafny.ISequence<Dafny.Rune> _1199_lhsGen;
-          bool _1200_needsIIFE;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1201_recIdents;
-          Dafny.ISequence<Dafny.Rune> _out109;
-          bool _out110;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out111;
-          DCOMP.COMP.GenAssignLhs(_1198_lhs, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("__rhs"), selfIdent, @params, out _out109, out _out110, out _out111);
-          _1199_lhsGen = _out109;
-          _1200_needsIIFE = _out110;
-          _1201_recIdents = _out111;
-          Dafny.ISequence<Dafny.Rune> _1202_exprGen;
-          bool _1203___v21;
-          bool _1204_exprErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1205_exprIdents;
-          Dafny.ISequence<Dafny.Rune> _out112;
-          bool _out113;
-          bool _out114;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out115;
-          DCOMP.COMP.GenExpr(_1197_expression, selfIdent, @params, true, out _out112, out _out113, out _out114, out _out115);
-          _1202_exprGen = _out112;
-          _1203___v21 = _out113;
-          _1204_exprErased = _out114;
-          _1205_exprIdents = _out115;
-          if (!(_1204_exprErased)) {
-            _1202_exprGen = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _1202_exprGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-          }
-          _1202_exprGen = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyUnerasable::<_>::unerase_owned("), _1202_exprGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-          if (_1200_needsIIFE) {
-            generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("{\nlet __rhs = "), _1202_exprGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";\n")), _1199_lhsGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n}"));
-          } else {
-            generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_1199_lhsGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" = ")), _1202_exprGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";"));
-          }
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(_1201_recIdents, _1205_exprIdents);
-        }
-      } else if (_source43.is_If) {
-        DAST._IExpression _1206___mcc_h6 = _source43.dtor_cond;
-        Dafny.ISequence<DAST._IStatement> _1207___mcc_h7 = _source43.dtor_thn;
-        Dafny.ISequence<DAST._IStatement> _1208___mcc_h8 = _source43.dtor_els;
-        Dafny.ISequence<DAST._IStatement> _1209_els = _1208___mcc_h8;
-        Dafny.ISequence<DAST._IStatement> _1210_thn = _1207___mcc_h7;
-        DAST._IExpression _1211_cond = _1206___mcc_h6;
-        {
-          Dafny.ISequence<Dafny.Rune> _1212_condString;
-          bool _1213___v22;
-          bool _1214_condErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1215_recIdents;
-          Dafny.ISequence<Dafny.Rune> _out116;
-          bool _out117;
-          bool _out118;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out119;
-          DCOMP.COMP.GenExpr(_1211_cond, selfIdent, @params, true, out _out116, out _out117, out _out118, out _out119);
-          _1212_condString = _out116;
-          _1213___v22 = _out117;
-          _1214_condErased = _out118;
-          _1215_recIdents = _out119;
-          if (!(_1214_condErased)) {
-            _1212_condString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _1212_condString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-          }
-          readIdents = _1215_recIdents;
-          Dafny.ISequence<Dafny.Rune> _1216_thnString;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1217_thnIdents;
-          Dafny.ISequence<Dafny.Rune> _out120;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out121;
-          DCOMP.COMP.GenStmts(_1210_thn, selfIdent, @params, isLast, earlyReturn, out _out120, out _out121);
-          _1216_thnString = _out120;
-          _1217_thnIdents = _out121;
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _1217_thnIdents);
-          Dafny.ISequence<Dafny.Rune> _1218_elsString;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1219_elsIdents;
-          Dafny.ISequence<Dafny.Rune> _out122;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out123;
-          DCOMP.COMP.GenStmts(_1209_els, selfIdent, @params, isLast, earlyReturn, out _out122, out _out123);
-          _1218_elsString = _out122;
-          _1219_elsIdents = _out123;
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _1219_elsIdents);
-          generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("if "), _1212_condString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {\n")), _1216_thnString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n} else {\n")), _1218_elsString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n}"));
-        }
-      } else if (_source43.is_Labeled) {
-        Dafny.ISequence<Dafny.Rune> _1220___mcc_h9 = _source43.dtor_lbl;
-        Dafny.ISequence<DAST._IStatement> _1221___mcc_h10 = _source43.dtor_body;
-        Dafny.ISequence<DAST._IStatement> _1222_body = _1221___mcc_h10;
-        Dafny.ISequence<Dafny.Rune> _1223_lbl = _1220___mcc_h9;
-        {
-          Dafny.ISequence<Dafny.Rune> _1224_bodyString;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1225_bodyIdents;
-          Dafny.ISequence<Dafny.Rune> _out124;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out125;
-          DCOMP.COMP.GenStmts(_1222_body, selfIdent, @params, isLast, earlyReturn, out _out124, out _out125);
-          _1224_bodyString = _out124;
-          _1225_bodyIdents = _out125;
-          readIdents = _1225_bodyIdents;
-          generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("'label_"), _1223_lbl), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(": loop {\n")), _1224_bodyString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("break;")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n}"));
-        }
-      } else if (_source43.is_While) {
-        DAST._IExpression _1226___mcc_h11 = _source43.dtor_cond;
-        Dafny.ISequence<DAST._IStatement> _1227___mcc_h12 = _source43.dtor_body;
-        Dafny.ISequence<DAST._IStatement> _1228_body = _1227___mcc_h12;
-        DAST._IExpression _1229_cond = _1226___mcc_h11;
-        {
-          Dafny.ISequence<Dafny.Rune> _1230_condString;
-          bool _1231___v23;
-          bool _1232_condErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1233_recIdents;
-          Dafny.ISequence<Dafny.Rune> _out126;
-          bool _out127;
-          bool _out128;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out129;
-          DCOMP.COMP.GenExpr(_1229_cond, selfIdent, @params, true, out _out126, out _out127, out _out128, out _out129);
-          _1230_condString = _out126;
-          _1231___v23 = _out127;
-          _1232_condErased = _out128;
-          _1233_recIdents = _out129;
-          if (!(_1232_condErased)) {
-            _1230_condString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _1230_condString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-          }
-          readIdents = _1233_recIdents;
-          Dafny.ISequence<Dafny.Rune> _1234_bodyString;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1235_bodyIdents;
-          Dafny.ISequence<Dafny.Rune> _out130;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out131;
-          DCOMP.COMP.GenStmts(_1228_body, selfIdent, @params, false, earlyReturn, out _out130, out _out131);
-          _1234_bodyString = _out130;
-          _1235_bodyIdents = _out131;
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _1235_bodyIdents);
-          generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("while "), _1230_condString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {\n")), _1234_bodyString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n}"));
-        }
-      } else if (_source43.is_Foreach) {
-        Dafny.ISequence<Dafny.Rune> _1236___mcc_h13 = _source43.dtor_boundName;
-        DAST._IType _1237___mcc_h14 = _source43.dtor_boundType;
-        DAST._IExpression _1238___mcc_h15 = _source43.dtor_over;
-        Dafny.ISequence<DAST._IStatement> _1239___mcc_h16 = _source43.dtor_body;
-        Dafny.ISequence<DAST._IStatement> _1240_body = _1239___mcc_h16;
-        DAST._IExpression _1241_over = _1238___mcc_h15;
-        DAST._IType _1242_boundType = _1237___mcc_h14;
-        Dafny.ISequence<Dafny.Rune> _1243_boundName = _1236___mcc_h13;
-        {
-          Dafny.ISequence<Dafny.Rune> _1244_overString;
-          bool _1245___v24;
-          bool _1246_overErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1247_recIdents;
-          Dafny.ISequence<Dafny.Rune> _out132;
-          bool _out133;
-          bool _out134;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out135;
-          DCOMP.COMP.GenExpr(_1241_over, selfIdent, @params, true, out _out132, out _out133, out _out134, out _out135);
-          _1244_overString = _out132;
-          _1245___v24 = _out133;
-          _1246_overErased = _out134;
-          _1247_recIdents = _out135;
-          Dafny.ISequence<Dafny.Rune> _1248_boundTypeStr;
-          Dafny.ISequence<Dafny.Rune> _out136;
-          _out136 = DCOMP.COMP.GenType(_1242_boundType, false, false);
-          _1248_boundTypeStr = _out136;
-          readIdents = _1247_recIdents;
-          Dafny.ISequence<Dafny.Rune> _1249_bodyString;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1250_bodyIdents;
-          Dafny.ISequence<Dafny.Rune> _out137;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out138;
-          DCOMP.COMP.GenStmts(_1240_body, selfIdent, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Concat(@params, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(_1243_boundName)), false, earlyReturn, out _out137, out _out138);
-          _1249_bodyString = _out137;
-          _1250_bodyIdents = _out138;
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Difference(Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _1250_bodyIdents), Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements(_1243_boundName));
-          Dafny.ISequence<Dafny.Rune> _1251_unerasedIter;
-          _1251_unerasedIter = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_iter_erased");
-          if (_1246_overErased) {
-            _1251_unerasedIter = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _1248_boundTypeStr), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ::dafny_runtime::DafnyUnerasable<_>>::unerase_owned(")), _1251_unerasedIter), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-          }
-          generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("for _iter_erased in "), _1244_overString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {\n"));
-          generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(generated, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("let ")), DCOMP.__default.escapeIdent(_1243_boundName)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" = ")), _1251_unerasedIter), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";\n")), _1249_bodyString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n}"));
-        }
-      } else if (_source43.is_Call) {
-        DAST._IExpression _1252___mcc_h17 = _source43.dtor_on;
-        Dafny.ISequence<Dafny.Rune> _1253___mcc_h18 = _source43.dtor_name;
-        Dafny.ISequence<DAST._IType> _1254___mcc_h19 = _source43.dtor_typeArgs;
-        Dafny.ISequence<DAST._IExpression> _1255___mcc_h20 = _source43.dtor_args;
-        Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> _1256___mcc_h21 = _source43.dtor_outs;
-        Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> _1257_maybeOutVars = _1256___mcc_h21;
-        Dafny.ISequence<DAST._IExpression> _1258_args = _1255___mcc_h20;
-        Dafny.ISequence<DAST._IType> _1259_typeArgs = _1254___mcc_h19;
-        Dafny.ISequence<Dafny.Rune> _1260_name = _1253___mcc_h18;
-        DAST._IExpression _1261_on = _1252___mcc_h17;
-        {
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-          Dafny.ISequence<Dafny.Rune> _1262_typeArgString;
-          _1262_typeArgString = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-          if ((new BigInteger((_1259_typeArgs).Count)) >= (BigInteger.One)) {
-            BigInteger _1263_typeI;
-            _1263_typeI = BigInteger.Zero;
-            _1262_typeArgString = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::<");
-            while ((_1263_typeI) < (new BigInteger((_1259_typeArgs).Count))) {
-              if ((_1263_typeI).Sign == 1) {
-                _1262_typeArgString = Dafny.Sequence<Dafny.Rune>.Concat(_1262_typeArgString, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-              }
-              Dafny.ISequence<Dafny.Rune> _1264_typeString;
-              Dafny.ISequence<Dafny.Rune> _out139;
-              _out139 = DCOMP.COMP.GenType((_1259_typeArgs).Select(_1263_typeI), false, false);
-              _1264_typeString = _out139;
-              _1262_typeArgString = Dafny.Sequence<Dafny.Rune>.Concat(_1262_typeArgString, _1264_typeString);
-              _1263_typeI = (_1263_typeI) + (BigInteger.One);
-            }
-            _1262_typeArgString = Dafny.Sequence<Dafny.Rune>.Concat(_1262_typeArgString, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">"));
-          }
-          Dafny.ISequence<Dafny.Rune> _1265_argString;
-          _1265_argString = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-          BigInteger _1266_i;
-          _1266_i = BigInteger.Zero;
-          while ((_1266_i) < (new BigInteger((_1258_args).Count))) {
-            if ((_1266_i).Sign == 1) {
-              _1265_argString = Dafny.Sequence<Dafny.Rune>.Concat(_1265_argString, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-            }
-            Dafny.ISequence<Dafny.Rune> _1267_argExpr;
-            bool _1268_isOwned;
-            bool _1269_argErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1270_argIdents;
-            Dafny.ISequence<Dafny.Rune> _out140;
-            bool _out141;
-            bool _out142;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out143;
-            DCOMP.COMP.GenExpr((_1258_args).Select(_1266_i), selfIdent, @params, false, out _out140, out _out141, out _out142, out _out143);
-            _1267_argExpr = _out140;
-            _1268_isOwned = _out141;
-            _1269_argErased = _out142;
-            _1270_argIdents = _out143;
-            if (_1269_argErased) {
-              _1267_argExpr = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyUnerasable::<_>::unerase_owned("), _1267_argExpr), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            }
-            if (_1268_isOwned) {
-              _1267_argExpr = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), _1267_argExpr);
-            }
-            _1265_argString = Dafny.Sequence<Dafny.Rune>.Concat(_1265_argString, _1267_argExpr);
-            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _1270_argIdents);
-            _1266_i = (_1266_i) + (BigInteger.One);
-          }
-          Dafny.ISequence<Dafny.Rune> _1271_enclosingString;
-          bool _1272___v25;
-          bool _1273___v26;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1274_enclosingIdents;
-          Dafny.ISequence<Dafny.Rune> _out144;
-          bool _out145;
-          bool _out146;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out147;
-          DCOMP.COMP.GenExpr(_1261_on, selfIdent, @params, false, out _out144, out _out145, out _out146, out _out147);
-          _1271_enclosingString = _out144;
-          _1272___v25 = _out145;
-          _1273___v26 = _out146;
-          _1274_enclosingIdents = _out147;
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _1274_enclosingIdents);
-          DAST._IExpression _source45 = _1261_on;
-          if (_source45.is_Literal) {
-            DAST._ILiteral _1275___mcc_h26 = _source45.dtor_Literal_a0;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_Ident) {
-            Dafny.ISequence<Dafny.Rune> _1276___mcc_h28 = _source45.dtor_Ident_a0;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_Companion) {
-            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1277___mcc_h30 = _source45.dtor_Companion_a0;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(_1271_enclosingString, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::"));
-            }
-          } else if (_source45.is_Tuple) {
-            Dafny.ISequence<DAST._IExpression> _1278___mcc_h32 = _source45.dtor_Tuple_a0;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_New) {
-            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1279___mcc_h34 = _source45.dtor_path;
-            Dafny.ISequence<DAST._IType> _1280___mcc_h35 = _source45.dtor_typeArgs;
-            Dafny.ISequence<DAST._IExpression> _1281___mcc_h36 = _source45.dtor_args;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_NewArray) {
-            Dafny.ISequence<DAST._IExpression> _1282___mcc_h40 = _source45.dtor_dims;
-            DAST._IType _1283___mcc_h41 = _source45.dtor_typ;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_DatatypeValue) {
-            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1284___mcc_h44 = _source45.dtor_path;
-            Dafny.ISequence<DAST._IType> _1285___mcc_h45 = _source45.dtor_typeArgs;
-            Dafny.ISequence<Dafny.Rune> _1286___mcc_h46 = _source45.dtor_variant;
-            bool _1287___mcc_h47 = _source45.dtor_isCo;
-            Dafny.ISequence<_System._ITuple2<Dafny.ISequence<Dafny.Rune>, DAST._IExpression>> _1288___mcc_h48 = _source45.dtor_contents;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_Convert) {
-            DAST._IExpression _1289___mcc_h54 = _source45.dtor_value;
-            DAST._IType _1290___mcc_h55 = _source45.dtor_from;
-            DAST._IType _1291___mcc_h56 = _source45.dtor_typ;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_SeqConstruct) {
-            DAST._IExpression _1292___mcc_h60 = _source45.dtor_length;
-            DAST._IExpression _1293___mcc_h61 = _source45.dtor_elem;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_SeqValue) {
-            Dafny.ISequence<DAST._IExpression> _1294___mcc_h64 = _source45.dtor_elements;
-            DAST._IType _1295___mcc_h65 = _source45.dtor_typ;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_SetValue) {
-            Dafny.ISequence<DAST._IExpression> _1296___mcc_h68 = _source45.dtor_elements;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_MapValue) {
-            Dafny.ISequence<_System._ITuple2<DAST._IExpression, DAST._IExpression>> _1297___mcc_h70 = _source45.dtor_mapElems;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_This) {
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_Ite) {
-            DAST._IExpression _1298___mcc_h72 = _source45.dtor_cond;
-            DAST._IExpression _1299___mcc_h73 = _source45.dtor_thn;
-            DAST._IExpression _1300___mcc_h74 = _source45.dtor_els;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_UnOp) {
-            DAST._IUnaryOp _1301___mcc_h78 = _source45.dtor_unOp;
-            DAST._IExpression _1302___mcc_h79 = _source45.dtor_expr;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_BinOp) {
-            DAST._IBinOp _1303___mcc_h82 = _source45.dtor_op;
-            DAST._IExpression _1304___mcc_h83 = _source45.dtor_left;
-            DAST._IExpression _1305___mcc_h84 = _source45.dtor_right;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_ArrayLen) {
-            DAST._IExpression _1306___mcc_h88 = _source45.dtor_expr;
-            BigInteger _1307___mcc_h89 = _source45.dtor_dim;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_Select) {
-            DAST._IExpression _1308___mcc_h92 = _source45.dtor_expr;
-            Dafny.ISequence<Dafny.Rune> _1309___mcc_h93 = _source45.dtor_field;
-            bool _1310___mcc_h94 = _source45.dtor_isConstant;
-            bool _1311___mcc_h95 = _source45.dtor_onDatatype;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_SelectFn) {
-            DAST._IExpression _1312___mcc_h100 = _source45.dtor_expr;
-            Dafny.ISequence<Dafny.Rune> _1313___mcc_h101 = _source45.dtor_field;
-            bool _1314___mcc_h102 = _source45.dtor_onDatatype;
-            bool _1315___mcc_h103 = _source45.dtor_isStatic;
-            BigInteger _1316___mcc_h104 = _source45.dtor_arity;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_Index) {
-            DAST._IExpression _1317___mcc_h110 = _source45.dtor_expr;
-            DAST._ICollKind _1318___mcc_h111 = _source45.dtor_collKind;
-            Dafny.ISequence<DAST._IExpression> _1319___mcc_h112 = _source45.dtor_indices;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_IndexRange) {
-            DAST._IExpression _1320___mcc_h116 = _source45.dtor_expr;
-            bool _1321___mcc_h117 = _source45.dtor_isArray;
-            Std.Wrappers._IOption<DAST._IExpression> _1322___mcc_h118 = _source45.dtor_low;
-            Std.Wrappers._IOption<DAST._IExpression> _1323___mcc_h119 = _source45.dtor_high;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_TupleSelect) {
-            DAST._IExpression _1324___mcc_h124 = _source45.dtor_expr;
-            BigInteger _1325___mcc_h125 = _source45.dtor_index;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_Call) {
-            DAST._IExpression _1326___mcc_h128 = _source45.dtor_on;
-            Dafny.ISequence<Dafny.Rune> _1327___mcc_h129 = _source45.dtor_name;
-            Dafny.ISequence<DAST._IType> _1328___mcc_h130 = _source45.dtor_typeArgs;
-            Dafny.ISequence<DAST._IExpression> _1329___mcc_h131 = _source45.dtor_args;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_Lambda) {
-            Dafny.ISequence<DAST._IFormal> _1330___mcc_h136 = _source45.dtor_params;
-            DAST._IType _1331___mcc_h137 = _source45.dtor_retType;
-            Dafny.ISequence<DAST._IStatement> _1332___mcc_h138 = _source45.dtor_body;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_BetaRedex) {
-            Dafny.ISequence<_System._ITuple2<DAST._IFormal, DAST._IExpression>> _1333___mcc_h142 = _source45.dtor_values;
-            DAST._IType _1334___mcc_h143 = _source45.dtor_retType;
-            DAST._IExpression _1335___mcc_h144 = _source45.dtor_expr;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_IIFE) {
-            Dafny.ISequence<Dafny.Rune> _1336___mcc_h148 = _source45.dtor_name;
-            DAST._IType _1337___mcc_h149 = _source45.dtor_typ;
-            DAST._IExpression _1338___mcc_h150 = _source45.dtor_value;
-            DAST._IExpression _1339___mcc_h151 = _source45.dtor_iifeBody;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_Apply) {
-            DAST._IExpression _1340___mcc_h156 = _source45.dtor_expr;
-            Dafny.ISequence<DAST._IExpression> _1341___mcc_h157 = _source45.dtor_args;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_TypeTest) {
-            DAST._IExpression _1342___mcc_h160 = _source45.dtor_on;
-            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1343___mcc_h161 = _source45.dtor_dType;
-            Dafny.ISequence<Dafny.Rune> _1344___mcc_h162 = _source45.dtor_variant;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_InitializationValue) {
-            DAST._IType _1345___mcc_h166 = _source45.dtor_typ;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_BoolBoundedPool) {
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_SetBoundedPool) {
-            DAST._IExpression _1346___mcc_h168 = _source45.dtor_of;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else if (_source45.is_SeqBoundedPool) {
-            DAST._IExpression _1347___mcc_h170 = _source45.dtor_of;
-            bool _1348___mcc_h171 = _source45.dtor_includeDuplicates;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          } else {
-            DAST._IExpression _1349___mcc_h174 = _source45.dtor_lo;
-            DAST._IExpression _1350___mcc_h175 = _source45.dtor_hi;
-            {
-              _1271_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1271_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
-            }
-          }
-          Dafny.ISequence<Dafny.Rune> _1351_receiver;
-          _1351_receiver = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-          Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> _source46 = _1257_maybeOutVars;
-          if (_source46.is_None) {
-          } else {
-            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1352___mcc_h178 = _source46.dtor_value;
-            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1353_outVars = _1352___mcc_h178;
-            {
-              if ((new BigInteger((_1353_outVars).Count)) > (BigInteger.One)) {
-                _1351_receiver = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(");
-              }
-              BigInteger _1354_outI;
-              _1354_outI = BigInteger.Zero;
-              while ((_1354_outI) < (new BigInteger((_1353_outVars).Count))) {
-                if ((_1354_outI).Sign == 1) {
-                  _1351_receiver = Dafny.Sequence<Dafny.Rune>.Concat(_1351_receiver, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-                }
-                Dafny.ISequence<Dafny.Rune> _1355_outVar;
-                _1355_outVar = (_1353_outVars).Select(_1354_outI);
-                _1351_receiver = Dafny.Sequence<Dafny.Rune>.Concat(_1351_receiver, (_1355_outVar));
-                _1354_outI = (_1354_outI) + (BigInteger.One);
-              }
-              if ((new BigInteger((_1353_outVars).Count)) > (BigInteger.One)) {
-                _1351_receiver = Dafny.Sequence<Dafny.Rune>.Concat(_1351_receiver, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-            }
-          }
-          generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(((!(_1351_receiver).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))) ? (Dafny.Sequence<Dafny.Rune>.Concat(_1351_receiver, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" = "))) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))), _1271_enclosingString), DCOMP.__default.escapeIdent(_1260_name)), _1262_typeArgString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _1265_argString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(");"));
-        }
-      } else if (_source43.is_Return) {
-        DAST._IExpression _1356___mcc_h22 = _source43.dtor_expr;
-        DAST._IExpression _1357_expr = _1356___mcc_h22;
-        {
-          Dafny.ISequence<Dafny.Rune> _1358_exprString;
-          bool _1359___v29;
-          bool _1360_recErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1361_recIdents;
-          Dafny.ISequence<Dafny.Rune> _out148;
-          bool _out149;
-          bool _out150;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out151;
-          DCOMP.COMP.GenExpr(_1357_expr, selfIdent, @params, true, out _out148, out _out149, out _out150, out _out151);
-          _1358_exprString = _out148;
-          _1359___v29 = _out149;
-          _1360_recErased = _out150;
-          _1361_recIdents = _out151;
-          _1358_exprString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyUnerasable::<_>::unerase_owned(::dafny_runtime::DafnyErasable::erase_owned("), _1358_exprString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("))"));
-          readIdents = _1361_recIdents;
-          if (isLast) {
-            generated = _1358_exprString;
-          } else {
-            generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("return "), _1358_exprString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";"));
-          }
-        }
-      } else if (_source43.is_EarlyReturn) {
-        {
-          generated = earlyReturn;
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-        }
-      } else if (_source43.is_Break) {
-        Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1362___mcc_h23 = _source43.dtor_toLabel;
-        Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1363_toLabel = _1362___mcc_h23;
-        {
-          Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _source47 = _1363_toLabel;
-          if (_source47.is_None) {
-            {
-              generated = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("break;");
-            }
-          } else {
-            Dafny.ISequence<Dafny.Rune> _1364___mcc_h179 = _source47.dtor_value;
-            Dafny.ISequence<Dafny.Rune> _1365_lbl = _1364___mcc_h179;
-            {
-              generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("break 'label_"), _1365_lbl), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";"));
-            }
-          }
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-        }
-      } else if (_source43.is_TailRecursive) {
-        Dafny.ISequence<DAST._IStatement> _1366___mcc_h24 = _source43.dtor_body;
-        Dafny.ISequence<DAST._IStatement> _1367_body = _1366___mcc_h24;
-        {
-          generated = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-          if (!object.Equals(selfIdent, Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None())) {
-            generated = Dafny.Sequence<Dafny.Rune>.Concat(generated, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("let mut _this = self.clone();\n"));
-          }
-          BigInteger _1368_paramI;
-          _1368_paramI = BigInteger.Zero;
-          while ((_1368_paramI) < (new BigInteger((@params).Count))) {
-            Dafny.ISequence<Dafny.Rune> _1369_param;
-            _1369_param = (@params).Select(_1368_paramI);
-            generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(generated, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("let mut ")), DCOMP.__default.escapeIdent(_1369_param)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" = ")), DCOMP.__default.escapeIdent(_1369_param)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".clone();\n"));
-            _1368_paramI = (_1368_paramI) + (BigInteger.One);
-          }
-          Dafny.ISequence<Dafny.Rune> _1370_bodyString;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1371_bodyIdents;
-          Dafny.ISequence<Dafny.Rune> _out152;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out153;
-          DCOMP.COMP.GenStmts(_1367_body, ((!object.Equals(selfIdent, Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None())) ? (Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_Some(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_this"))) : (Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None())), Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(), false, earlyReturn, out _out152, out _out153);
-          _1370_bodyString = _out152;
-          _1371_bodyIdents = _out153;
-          readIdents = _1371_bodyIdents;
-          generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(generated, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("'TAIL_CALL_START: loop {\n")), _1370_bodyString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n}"));
-        }
-      } else if (_source43.is_JumpTailCallStart) {
-        {
-          generated = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("continue 'TAIL_CALL_START;");
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-        }
-      } else if (_source43.is_Halt) {
-        {
-          generated = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("panic!(\"Halt\");");
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-        }
-      } else {
-        DAST._IExpression _1372___mcc_h25 = _source43.dtor_Print_a0;
-        DAST._IExpression _1373_e = _1372___mcc_h25;
-        {
-          Dafny.ISequence<Dafny.Rune> _1374_printedExpr;
-          bool _1375_isOwned;
-          bool _1376___v30;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1377_recIdents;
-          Dafny.ISequence<Dafny.Rune> _out154;
-          bool _out155;
-          bool _out156;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out157;
-          DCOMP.COMP.GenExpr(_1373_e, selfIdent, @params, false, out _out154, out _out155, out _out156, out _out157);
-          _1374_printedExpr = _out154;
-          _1375_isOwned = _out155;
-          _1376___v30 = _out156;
-          _1377_recIdents = _out157;
-          if (_1375_isOwned) {
-            _1374_printedExpr = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&("), _1374_printedExpr), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-          }
-          generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("print!(\"{}\", ::dafny_runtime::DafnyPrintWrapper("), _1374_printedExpr), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("));"));
-          readIdents = _1377_recIdents;
-        }
-      }
-    }
-    public static void GenExpr(DAST._IExpression e, Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> selfIdent, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> @params, bool mustOwn, out Dafny.ISequence<Dafny.Rune> s, out bool isOwned, out bool isErased, out Dafny.ISet<Dafny.ISequence<Dafny.Rune>> readIdents) {
-      s = Dafny.Sequence<Dafny.Rune>.Empty;
-      isOwned = false;
-      isErased = false;
-      readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Empty;
-      DAST._IExpression _source48 = e;
-      if (_source48.is_Literal) {
-        DAST._ILiteral _1378___mcc_h0 = _source48.dtor_Literal_a0;
-        DAST._ILiteral _source49 = _1378___mcc_h0;
-        if (_source49.is_BoolLiteral) {
-          bool _1379___mcc_h1 = _source49.dtor_BoolLiteral_a0;
-          if ((_1379___mcc_h1) == (false)) {
-            {
-              s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("false");
-              isOwned = true;
-              isErased = false;
-              readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-            }
-          } else {
-            {
-              s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("true");
-              isOwned = true;
-              isErased = false;
-              readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-            }
-          }
-        } else if (_source49.is_IntLiteral) {
-          Dafny.ISequence<Dafny.Rune> _1380___mcc_h2 = _source49.dtor_IntLiteral_a0;
-          DAST._IType _1381___mcc_h3 = _source49.dtor_IntLiteral_a1;
-          DAST._IType _1382_t = _1381___mcc_h3;
-          Dafny.ISequence<Dafny.Rune> _1383_i = _1380___mcc_h2;
-          {
-            DAST._IType _source50 = _1382_t;
-            if (_source50.is_Path) {
-              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1384___mcc_h237 = _source50.dtor_Path_a0;
-              Dafny.ISequence<DAST._IType> _1385___mcc_h238 = _source50.dtor_typeArgs;
-              DAST._IResolvedType _1386___mcc_h239 = _source50.dtor_resolved;
-              DAST._IType _1387_o = _1382_t;
-              {
-                Dafny.ISequence<Dafny.Rune> _1388_genType;
-                Dafny.ISequence<Dafny.Rune> _out158;
-                _out158 = DCOMP.COMP.GenType(_1387_o, false, false);
-                _1388_genType = _out158;
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1383_i), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ")), _1388_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-            } else if (_source50.is_Nullable) {
-              DAST._IType _1389___mcc_h243 = _source50.dtor_Nullable_a0;
-              DAST._IType _1390_o = _1382_t;
-              {
-                Dafny.ISequence<Dafny.Rune> _1391_genType;
-                Dafny.ISequence<Dafny.Rune> _out159;
-                _out159 = DCOMP.COMP.GenType(_1390_o, false, false);
-                _1391_genType = _out159;
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1383_i), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ")), _1391_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-            } else if (_source50.is_Tuple) {
-              Dafny.ISequence<DAST._IType> _1392___mcc_h245 = _source50.dtor_Tuple_a0;
-              DAST._IType _1393_o = _1382_t;
-              {
-                Dafny.ISequence<Dafny.Rune> _1394_genType;
-                Dafny.ISequence<Dafny.Rune> _out160;
-                _out160 = DCOMP.COMP.GenType(_1393_o, false, false);
-                _1394_genType = _out160;
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1383_i), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ")), _1394_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-            } else if (_source50.is_Array) {
-              DAST._IType _1395___mcc_h247 = _source50.dtor_element;
-              BigInteger _1396___mcc_h248 = _source50.dtor_dims;
-              DAST._IType _1397_o = _1382_t;
-              {
-                Dafny.ISequence<Dafny.Rune> _1398_genType;
-                Dafny.ISequence<Dafny.Rune> _out161;
-                _out161 = DCOMP.COMP.GenType(_1397_o, false, false);
-                _1398_genType = _out161;
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1383_i), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ")), _1398_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-            } else if (_source50.is_Seq) {
-              DAST._IType _1399___mcc_h251 = _source50.dtor_element;
-              DAST._IType _1400_o = _1382_t;
-              {
-                Dafny.ISequence<Dafny.Rune> _1401_genType;
-                Dafny.ISequence<Dafny.Rune> _out162;
-                _out162 = DCOMP.COMP.GenType(_1400_o, false, false);
-                _1401_genType = _out162;
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1383_i), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ")), _1401_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-            } else if (_source50.is_Set) {
-              DAST._IType _1402___mcc_h253 = _source50.dtor_element;
-              DAST._IType _1403_o = _1382_t;
-              {
-                Dafny.ISequence<Dafny.Rune> _1404_genType;
-                Dafny.ISequence<Dafny.Rune> _out163;
-                _out163 = DCOMP.COMP.GenType(_1403_o, false, false);
-                _1404_genType = _out163;
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1383_i), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ")), _1404_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-            } else if (_source50.is_Multiset) {
-              DAST._IType _1405___mcc_h255 = _source50.dtor_element;
-              DAST._IType _1406_o = _1382_t;
-              {
-                Dafny.ISequence<Dafny.Rune> _1407_genType;
-                Dafny.ISequence<Dafny.Rune> _out164;
-                _out164 = DCOMP.COMP.GenType(_1406_o, false, false);
-                _1407_genType = _out164;
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1383_i), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ")), _1407_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-            } else if (_source50.is_Map) {
-              DAST._IType _1408___mcc_h257 = _source50.dtor_key;
-              DAST._IType _1409___mcc_h258 = _source50.dtor_value;
-              DAST._IType _1410_o = _1382_t;
-              {
-                Dafny.ISequence<Dafny.Rune> _1411_genType;
-                Dafny.ISequence<Dafny.Rune> _out165;
-                _out165 = DCOMP.COMP.GenType(_1410_o, false, false);
-                _1411_genType = _out165;
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1383_i), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ")), _1411_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-            } else if (_source50.is_Arrow) {
-              Dafny.ISequence<DAST._IType> _1412___mcc_h261 = _source50.dtor_args;
-              DAST._IType _1413___mcc_h262 = _source50.dtor_result;
-              DAST._IType _1414_o = _1382_t;
-              {
-                Dafny.ISequence<Dafny.Rune> _1415_genType;
-                Dafny.ISequence<Dafny.Rune> _out166;
-                _out166 = DCOMP.COMP.GenType(_1414_o, false, false);
-                _1415_genType = _out166;
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1383_i), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ")), _1415_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-            } else if (_source50.is_Primitive) {
-              DAST._IPrimitive _1416___mcc_h265 = _source50.dtor_Primitive_a0;
-              DAST._IPrimitive _source51 = _1416___mcc_h265;
-              if (_source51.is_Int) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::BigInt::parse_bytes(b\""), _1383_i), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\", 10).unwrap()"));
-                }
-              } else if (_source51.is_Real) {
-                DAST._IType _1417_o = _1382_t;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1418_genType;
-                  Dafny.ISequence<Dafny.Rune> _out167;
-                  _out167 = DCOMP.COMP.GenType(_1417_o, false, false);
-                  _1418_genType = _out167;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1383_i), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ")), _1418_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else if (_source51.is_String) {
-                DAST._IType _1419_o = _1382_t;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1420_genType;
-                  Dafny.ISequence<Dafny.Rune> _out168;
-                  _out168 = DCOMP.COMP.GenType(_1419_o, false, false);
-                  _1420_genType = _out168;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1383_i), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ")), _1420_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else if (_source51.is_Bool) {
-                DAST._IType _1421_o = _1382_t;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1422_genType;
-                  Dafny.ISequence<Dafny.Rune> _out169;
-                  _out169 = DCOMP.COMP.GenType(_1421_o, false, false);
-                  _1422_genType = _out169;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1383_i), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ")), _1422_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else {
-                DAST._IType _1423_o = _1382_t;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1424_genType;
-                  Dafny.ISequence<Dafny.Rune> _out170;
-                  _out170 = DCOMP.COMP.GenType(_1423_o, false, false);
-                  _1424_genType = _out170;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1383_i), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ")), _1424_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              }
-            } else if (_source50.is_Passthrough) {
-              Dafny.ISequence<Dafny.Rune> _1425___mcc_h267 = _source50.dtor_Passthrough_a0;
-              DAST._IType _1426_o = _1382_t;
-              {
-                Dafny.ISequence<Dafny.Rune> _1427_genType;
-                Dafny.ISequence<Dafny.Rune> _out171;
-                _out171 = DCOMP.COMP.GenType(_1426_o, false, false);
-                _1427_genType = _out171;
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1383_i), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ")), _1427_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-            } else {
-              Dafny.ISequence<Dafny.Rune> _1428___mcc_h269 = _source50.dtor_TypeArg_a0;
-              DAST._IType _1429_o = _1382_t;
-              {
-                Dafny.ISequence<Dafny.Rune> _1430_genType;
-                Dafny.ISequence<Dafny.Rune> _out172;
-                _out172 = DCOMP.COMP.GenType(_1429_o, false, false);
-                _1430_genType = _out172;
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1383_i), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ")), _1430_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-            }
-            isOwned = true;
-            isErased = false;
-            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-          }
-        } else if (_source49.is_DecLiteral) {
-          Dafny.ISequence<Dafny.Rune> _1431___mcc_h4 = _source49.dtor_DecLiteral_a0;
-          Dafny.ISequence<Dafny.Rune> _1432___mcc_h5 = _source49.dtor_DecLiteral_a1;
-          DAST._IType _1433___mcc_h6 = _source49.dtor_DecLiteral_a2;
-          DAST._IType _1434_t = _1433___mcc_h6;
-          Dafny.ISequence<Dafny.Rune> _1435_d = _1432___mcc_h5;
-          Dafny.ISequence<Dafny.Rune> _1436_n = _1431___mcc_h4;
-          {
-            DAST._IType _source52 = _1434_t;
-            if (_source52.is_Path) {
-              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1437___mcc_h271 = _source52.dtor_Path_a0;
-              Dafny.ISequence<DAST._IType> _1438___mcc_h272 = _source52.dtor_typeArgs;
-              DAST._IResolvedType _1439___mcc_h273 = _source52.dtor_resolved;
-              DAST._IType _1440_o = _1434_t;
-              {
-                Dafny.ISequence<Dafny.Rune> _1441_genType;
-                Dafny.ISequence<Dafny.Rune> _out173;
-                _out173 = DCOMP.COMP.GenType(_1440_o, false, false);
-                _1441_genType = _out173;
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(("), _1436_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _1435_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") as ")), _1441_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-            } else if (_source52.is_Nullable) {
-              DAST._IType _1442___mcc_h277 = _source52.dtor_Nullable_a0;
-              DAST._IType _1443_o = _1434_t;
-              {
-                Dafny.ISequence<Dafny.Rune> _1444_genType;
-                Dafny.ISequence<Dafny.Rune> _out174;
-                _out174 = DCOMP.COMP.GenType(_1443_o, false, false);
-                _1444_genType = _out174;
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(("), _1436_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _1435_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") as ")), _1444_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-            } else if (_source52.is_Tuple) {
-              Dafny.ISequence<DAST._IType> _1445___mcc_h279 = _source52.dtor_Tuple_a0;
-              DAST._IType _1446_o = _1434_t;
-              {
-                Dafny.ISequence<Dafny.Rune> _1447_genType;
-                Dafny.ISequence<Dafny.Rune> _out175;
-                _out175 = DCOMP.COMP.GenType(_1446_o, false, false);
-                _1447_genType = _out175;
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(("), _1436_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _1435_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") as ")), _1447_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-            } else if (_source52.is_Array) {
-              DAST._IType _1448___mcc_h281 = _source52.dtor_element;
-              BigInteger _1449___mcc_h282 = _source52.dtor_dims;
-              DAST._IType _1450_o = _1434_t;
-              {
-                Dafny.ISequence<Dafny.Rune> _1451_genType;
-                Dafny.ISequence<Dafny.Rune> _out176;
-                _out176 = DCOMP.COMP.GenType(_1450_o, false, false);
-                _1451_genType = _out176;
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(("), _1436_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _1435_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") as ")), _1451_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-            } else if (_source52.is_Seq) {
-              DAST._IType _1452___mcc_h285 = _source52.dtor_element;
-              DAST._IType _1453_o = _1434_t;
-              {
-                Dafny.ISequence<Dafny.Rune> _1454_genType;
-                Dafny.ISequence<Dafny.Rune> _out177;
-                _out177 = DCOMP.COMP.GenType(_1453_o, false, false);
-                _1454_genType = _out177;
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(("), _1436_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _1435_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") as ")), _1454_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-            } else if (_source52.is_Set) {
-              DAST._IType _1455___mcc_h287 = _source52.dtor_element;
-              DAST._IType _1456_o = _1434_t;
-              {
-                Dafny.ISequence<Dafny.Rune> _1457_genType;
-                Dafny.ISequence<Dafny.Rune> _out178;
-                _out178 = DCOMP.COMP.GenType(_1456_o, false, false);
-                _1457_genType = _out178;
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(("), _1436_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _1435_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") as ")), _1457_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-            } else if (_source52.is_Multiset) {
-              DAST._IType _1458___mcc_h289 = _source52.dtor_element;
-              DAST._IType _1459_o = _1434_t;
-              {
-                Dafny.ISequence<Dafny.Rune> _1460_genType;
-                Dafny.ISequence<Dafny.Rune> _out179;
-                _out179 = DCOMP.COMP.GenType(_1459_o, false, false);
-                _1460_genType = _out179;
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(("), _1436_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _1435_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") as ")), _1460_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-            } else if (_source52.is_Map) {
-              DAST._IType _1461___mcc_h291 = _source52.dtor_key;
-              DAST._IType _1462___mcc_h292 = _source52.dtor_value;
-              DAST._IType _1463_o = _1434_t;
-              {
-                Dafny.ISequence<Dafny.Rune> _1464_genType;
-                Dafny.ISequence<Dafny.Rune> _out180;
-                _out180 = DCOMP.COMP.GenType(_1463_o, false, false);
-                _1464_genType = _out180;
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(("), _1436_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _1435_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") as ")), _1464_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-            } else if (_source52.is_Arrow) {
-              Dafny.ISequence<DAST._IType> _1465___mcc_h295 = _source52.dtor_args;
-              DAST._IType _1466___mcc_h296 = _source52.dtor_result;
-              DAST._IType _1467_o = _1434_t;
-              {
-                Dafny.ISequence<Dafny.Rune> _1468_genType;
-                Dafny.ISequence<Dafny.Rune> _out181;
-                _out181 = DCOMP.COMP.GenType(_1467_o, false, false);
-                _1468_genType = _out181;
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(("), _1436_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _1435_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") as ")), _1468_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-            } else if (_source52.is_Primitive) {
-              DAST._IPrimitive _1469___mcc_h299 = _source52.dtor_Primitive_a0;
-              DAST._IPrimitive _source53 = _1469___mcc_h299;
-              if (_source53.is_Int) {
-                DAST._IType _1470_o = _1434_t;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1471_genType;
-                  Dafny.ISequence<Dafny.Rune> _out182;
-                  _out182 = DCOMP.COMP.GenType(_1470_o, false, false);
-                  _1471_genType = _out182;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(("), _1436_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _1435_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") as ")), _1471_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else if (_source53.is_Real) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::BigRational::new(::dafny_runtime::BigInt::parse_bytes(b\""), _1436_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\", 10).unwrap(), ::dafny_runtime::BigInt::parse_bytes(b\"")), _1435_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\", 10).unwrap())"));
-                }
-              } else if (_source53.is_String) {
-                DAST._IType _1472_o = _1434_t;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1473_genType;
-                  Dafny.ISequence<Dafny.Rune> _out183;
-                  _out183 = DCOMP.COMP.GenType(_1472_o, false, false);
-                  _1473_genType = _out183;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(("), _1436_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _1435_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") as ")), _1473_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else if (_source53.is_Bool) {
-                DAST._IType _1474_o = _1434_t;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1475_genType;
-                  Dafny.ISequence<Dafny.Rune> _out184;
-                  _out184 = DCOMP.COMP.GenType(_1474_o, false, false);
-                  _1475_genType = _out184;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(("), _1436_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _1435_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") as ")), _1475_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else {
-                DAST._IType _1476_o = _1434_t;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1477_genType;
-                  Dafny.ISequence<Dafny.Rune> _out185;
-                  _out185 = DCOMP.COMP.GenType(_1476_o, false, false);
-                  _1477_genType = _out185;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(("), _1436_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _1435_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") as ")), _1477_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              }
-            } else if (_source52.is_Passthrough) {
-              Dafny.ISequence<Dafny.Rune> _1478___mcc_h301 = _source52.dtor_Passthrough_a0;
-              DAST._IType _1479_o = _1434_t;
-              {
-                Dafny.ISequence<Dafny.Rune> _1480_genType;
-                Dafny.ISequence<Dafny.Rune> _out186;
-                _out186 = DCOMP.COMP.GenType(_1479_o, false, false);
-                _1480_genType = _out186;
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(("), _1436_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _1435_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") as ")), _1480_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-            } else {
-              Dafny.ISequence<Dafny.Rune> _1481___mcc_h303 = _source52.dtor_TypeArg_a0;
-              DAST._IType _1482_o = _1434_t;
-              {
-                Dafny.ISequence<Dafny.Rune> _1483_genType;
-                Dafny.ISequence<Dafny.Rune> _out187;
-                _out187 = DCOMP.COMP.GenType(_1482_o, false, false);
-                _1483_genType = _out187;
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(("), _1436_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _1435_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") as ")), _1483_genType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-            }
-            isOwned = true;
-            isErased = false;
-            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-          }
-        } else if (_source49.is_StringLiteral) {
-          Dafny.ISequence<Dafny.Rune> _1484___mcc_h7 = _source49.dtor_StringLiteral_a0;
-          Dafny.ISequence<Dafny.Rune> _1485_l = _1484___mcc_h7;
-          {
-            s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\""), _1485_l), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\".chars().collect::<Vec<char>>()"));
-            isOwned = true;
-            isErased = false;
-            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-          }
-        } else if (_source49.is_CharLiteral) {
-          Dafny.Rune _1486___mcc_h8 = _source49.dtor_CharLiteral_a0;
-          Dafny.Rune _1487_c = _1486___mcc_h8;
-          {
-            s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::primitive::char::from_u32("), Std.Strings.__default.OfNat(new BigInteger((_1487_c).Value))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").unwrap()"));
-            isOwned = true;
-            isErased = false;
-            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-          }
-        } else {
-          DAST._IType _1488___mcc_h9 = _source49.dtor_Null_a0;
-          DAST._IType _1489_tpe = _1488___mcc_h9;
-          {
-            Dafny.ISequence<Dafny.Rune> _1490_tpeGen;
-            Dafny.ISequence<Dafny.Rune> _out188;
-            _out188 = DCOMP.COMP.GenType(_1489_tpe, false, false);
-            _1490_tpeGen = _out188;
-            s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(None as "), _1490_tpeGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            isOwned = true;
-            isErased = false;
-            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-          }
-        }
-      } else if (_source48.is_Ident) {
-        Dafny.ISequence<Dafny.Rune> _1491___mcc_h10 = _source48.dtor_Ident_a0;
-        Dafny.ISequence<Dafny.Rune> _1492_name = _1491___mcc_h10;
-        {
-          s = DCOMP.__default.escapeIdent(_1492_name);
-          if (!((@params).Contains(_1492_name))) {
-            s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(&"), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-          }
-          if (mustOwn) {
-            s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".clone()"));
-            isOwned = true;
-          } else {
-            isOwned = false;
-          }
-          isErased = false;
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements(_1492_name);
-        }
-      } else if (_source48.is_Companion) {
-        Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1493___mcc_h11 = _source48.dtor_Companion_a0;
-        Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1494_path = _1493___mcc_h11;
-        {
-          Dafny.ISequence<Dafny.Rune> _out189;
-          _out189 = DCOMP.COMP.GenPath(_1494_path);
-          s = _out189;
-          isOwned = true;
-          isErased = true;
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-        }
-      } else if (_source48.is_Tuple) {
-        Dafny.ISequence<DAST._IExpression> _1495___mcc_h12 = _source48.dtor_Tuple_a0;
-        Dafny.ISequence<DAST._IExpression> _1496_values = _1495___mcc_h12;
-        {
-          s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(");
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-          BigInteger _1497_i;
-          _1497_i = BigInteger.Zero;
-          while ((_1497_i) < (new BigInteger((_1496_values).Count))) {
-            if ((_1497_i).Sign == 1) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" "));
-            }
-            Dafny.ISequence<Dafny.Rune> _1498_recursiveGen;
-            bool _1499___v31;
-            bool _1500_isErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1501_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out190;
-            bool _out191;
-            bool _out192;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out193;
-            DCOMP.COMP.GenExpr((_1496_values).Select(_1497_i), selfIdent, @params, true, out _out190, out _out191, out _out192, out _out193);
-            _1498_recursiveGen = _out190;
-            _1499___v31 = _out191;
-            _1500_isErased = _out192;
-            _1501_recIdents = _out193;
-            if (_1500_isErased) {
-              _1498_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyUnerasable::<_>::unerase_owned("), _1498_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            }
-            s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(s, _1498_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(","));
-            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _1501_recIdents);
-            _1497_i = (_1497_i) + (BigInteger.One);
-          }
-          s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-          isOwned = true;
-          isErased = false;
-        }
-      } else if (_source48.is_New) {
-        Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1502___mcc_h13 = _source48.dtor_path;
-        Dafny.ISequence<DAST._IType> _1503___mcc_h14 = _source48.dtor_typeArgs;
-        Dafny.ISequence<DAST._IExpression> _1504___mcc_h15 = _source48.dtor_args;
-        Dafny.ISequence<DAST._IExpression> _1505_args = _1504___mcc_h15;
-        Dafny.ISequence<DAST._IType> _1506_typeArgs = _1503___mcc_h14;
-        Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1507_path = _1502___mcc_h13;
-        {
-          Dafny.ISequence<Dafny.Rune> _1508_path;
-          Dafny.ISequence<Dafny.Rune> _out194;
-          _out194 = DCOMP.COMP.GenPath(_1507_path);
-          _1508_path = _out194;
-          s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::new("), _1508_path);
-          if ((new BigInteger((_1506_typeArgs).Count)).Sign == 1) {
-            s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::<"));
-            BigInteger _1509_i;
-            _1509_i = BigInteger.Zero;
-            while ((_1509_i) < (new BigInteger((_1506_typeArgs).Count))) {
-              if ((_1509_i).Sign == 1) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::"));
-              }
-              Dafny.ISequence<Dafny.Rune> _1510_typeString;
-              Dafny.ISequence<Dafny.Rune> _out195;
-              _out195 = DCOMP.COMP.GenType((_1506_typeArgs).Select(_1509_i), false, false);
-              _1510_typeString = _out195;
-              s = Dafny.Sequence<Dafny.Rune>.Concat(s, _1510_typeString);
-              _1509_i = (_1509_i) + (BigInteger.One);
-            }
-            s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">"));
-          }
-          s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::new("));
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-          BigInteger _1511_i;
-          _1511_i = BigInteger.Zero;
-          while ((_1511_i) < (new BigInteger((_1505_args).Count))) {
-            if ((_1511_i).Sign == 1) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-            }
-            Dafny.ISequence<Dafny.Rune> _1512_recursiveGen;
-            bool _1513___v32;
-            bool _1514_isErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1515_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out196;
-            bool _out197;
-            bool _out198;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out199;
-            DCOMP.COMP.GenExpr((_1505_args).Select(_1511_i), selfIdent, @params, true, out _out196, out _out197, out _out198, out _out199);
-            _1512_recursiveGen = _out196;
-            _1513___v32 = _out197;
-            _1514_isErased = _out198;
-            _1515_recIdents = _out199;
-            if (_1514_isErased) {
-              _1512_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyUnerasable::<_>::unerase_owned("), _1512_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            }
-            s = Dafny.Sequence<Dafny.Rune>.Concat(s, _1512_recursiveGen);
-            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _1515_recIdents);
-            _1511_i = (_1511_i) + (BigInteger.One);
-          }
-          s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("))"));
-          isOwned = true;
-          isErased = true;
-        }
-      } else if (_source48.is_NewArray) {
-        Dafny.ISequence<DAST._IExpression> _1516___mcc_h16 = _source48.dtor_dims;
-        DAST._IType _1517___mcc_h17 = _source48.dtor_typ;
-        DAST._IType _1518_typ = _1517___mcc_h17;
-        Dafny.ISequence<DAST._IExpression> _1519_dims = _1516___mcc_h16;
-        {
-          BigInteger _1520_i;
-          _1520_i = (new BigInteger((_1519_dims).Count)) - (BigInteger.One);
-          Dafny.ISequence<Dafny.Rune> _1521_genTyp;
-          Dafny.ISequence<Dafny.Rune> _out200;
-          _out200 = DCOMP.COMP.GenType(_1518_typ, false, false);
-          _1521_genTyp = _out200;
-          s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _1521_genTyp), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ::std::default::Default>::default()"));
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-          while ((_1520_i).Sign != -1) {
-            Dafny.ISequence<Dafny.Rune> _1522_recursiveGen;
-            bool _1523___v33;
-            bool _1524_isErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1525_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out201;
-            bool _out202;
-            bool _out203;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out204;
-            DCOMP.COMP.GenExpr((_1519_dims).Select(_1520_i), selfIdent, @params, true, out _out201, out _out202, out _out203, out _out204);
-            _1522_recursiveGen = _out201;
-            _1523___v33 = _out202;
-            _1524_isErased = _out203;
-            _1525_recIdents = _out204;
-            if (!(_1524_isErased)) {
-              _1522_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _1522_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            }
-            s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::new(::std::cell::RefCell::new(vec!["), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("; <usize as ::dafny_runtime::NumCast>::from(")), _1522_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").unwrap()]))"));
-            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _1525_recIdents);
-            _1520_i = (_1520_i) - (BigInteger.One);
-          }
-          isOwned = true;
-          isErased = false;
-        }
-      } else if (_source48.is_DatatypeValue) {
-        Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1526___mcc_h18 = _source48.dtor_path;
-        Dafny.ISequence<DAST._IType> _1527___mcc_h19 = _source48.dtor_typeArgs;
-        Dafny.ISequence<Dafny.Rune> _1528___mcc_h20 = _source48.dtor_variant;
-        bool _1529___mcc_h21 = _source48.dtor_isCo;
-        Dafny.ISequence<_System._ITuple2<Dafny.ISequence<Dafny.Rune>, DAST._IExpression>> _1530___mcc_h22 = _source48.dtor_contents;
-        Dafny.ISequence<_System._ITuple2<Dafny.ISequence<Dafny.Rune>, DAST._IExpression>> _1531_values = _1530___mcc_h22;
-        bool _1532_isCo = _1529___mcc_h21;
-        Dafny.ISequence<Dafny.Rune> _1533_variant = _1528___mcc_h20;
-        Dafny.ISequence<DAST._IType> _1534_typeArgs = _1527___mcc_h19;
-        Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1535_path = _1526___mcc_h18;
-        {
-          Dafny.ISequence<Dafny.Rune> _1536_path;
-          Dafny.ISequence<Dafny.Rune> _out205;
-          _out205 = DCOMP.COMP.GenPath(_1535_path);
-          _1536_path = _out205;
-          s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::new("), _1536_path), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::"));
-          if ((new BigInteger((_1534_typeArgs).Count)).Sign == 1) {
-            s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"));
-            BigInteger _1537_i;
-            _1537_i = BigInteger.Zero;
-            while ((_1537_i) < (new BigInteger((_1534_typeArgs).Count))) {
-              if ((_1537_i).Sign == 1) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-              }
-              Dafny.ISequence<Dafny.Rune> _1538_typeString;
-              Dafny.ISequence<Dafny.Rune> _out206;
-              _out206 = DCOMP.COMP.GenType((_1534_typeArgs).Select(_1537_i), false, false);
-              _1538_typeString = _out206;
-              s = Dafny.Sequence<Dafny.Rune>.Concat(s, _1538_typeString);
-              _1537_i = (_1537_i) + (BigInteger.One);
-            }
-            s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">::"));
-          }
-          s = Dafny.Sequence<Dafny.Rune>.Concat(s, DCOMP.__default.escapeIdent(_1533_variant));
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-          BigInteger _1539_i;
-          _1539_i = BigInteger.Zero;
-          s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {"));
-          while ((_1539_i) < (new BigInteger((_1531_values).Count))) {
-            _System._ITuple2<Dafny.ISequence<Dafny.Rune>, DAST._IExpression> _let_tmp_rhs41 = (_1531_values).Select(_1539_i);
-            Dafny.ISequence<Dafny.Rune> _1540_name = _let_tmp_rhs41.dtor__0;
-            DAST._IExpression _1541_value = _let_tmp_rhs41.dtor__1;
-            if ((_1539_i).Sign == 1) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-            }
-            if (_1532_isCo) {
-              Dafny.ISequence<Dafny.Rune> _1542_recursiveGen;
-              bool _1543___v34;
-              bool _1544_isErased;
-              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1545_recIdents;
-              Dafny.ISequence<Dafny.Rune> _out207;
-              bool _out208;
-              bool _out209;
-              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out210;
-              DCOMP.COMP.GenExpr(_1541_value, selfIdent, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(), true, out _out207, out _out208, out _out209, out _out210);
-              _1542_recursiveGen = _out207;
-              _1543___v34 = _out208;
-              _1544_isErased = _out209;
-              _1545_recIdents = _out210;
-              if (!(_1544_isErased)) {
-                _1542_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _1542_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-              _1542_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyUnerasable::<_>::unerase_owned("), _1542_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _1545_recIdents);
-              Dafny.ISequence<Dafny.Rune> _1546_allReadCloned;
-              _1546_allReadCloned = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-              while (!(_1545_recIdents).Equals(Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements())) {
-                Dafny.ISequence<Dafny.Rune> _1547_next;
-                foreach (Dafny.ISequence<Dafny.Rune> _assign_such_that_2 in (_1545_recIdents).Elements) {
-                  _1547_next = (Dafny.ISequence<Dafny.Rune>)_assign_such_that_2;
-                  if ((_1545_recIdents).Contains(_1547_next)) {
-                    goto after__ASSIGN_SUCH_THAT_2;
-                  }
-                }
-                throw new System.Exception("assign-such-that search produced no value (line 1839)");
-              after__ASSIGN_SUCH_THAT_2:;
-                _1546_allReadCloned = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_1546_allReadCloned, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("let ")), DCOMP.__default.escapeIdent(_1547_next)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" = ")), DCOMP.__default.escapeIdent(_1547_next)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".clone();\n"));
-                _1545_recIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Difference(_1545_recIdents, Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements(_1547_next));
-              }
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(s, DCOMP.__default.escapeIdent(_1540_name)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(": ::dafny_runtime::LazyFieldWrapper(::dafny_runtime::Lazy::new(::std::boxed::Box::new({\n")), _1546_allReadCloned), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("move || (")), _1542_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")})))"));
-            } else {
-              Dafny.ISequence<Dafny.Rune> _1548_recursiveGen;
-              bool _1549___v35;
-              bool _1550_isErased;
-              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1551_recIdents;
-              Dafny.ISequence<Dafny.Rune> _out211;
-              bool _out212;
-              bool _out213;
-              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out214;
-              DCOMP.COMP.GenExpr(_1541_value, selfIdent, @params, true, out _out211, out _out212, out _out213, out _out214);
-              _1548_recursiveGen = _out211;
-              _1549___v35 = _out212;
-              _1550_isErased = _out213;
-              _1551_recIdents = _out214;
-              if (!(_1550_isErased)) {
-                _1548_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _1548_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-              _1548_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyUnerasable::<_>::unerase_owned("), _1548_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(s, DCOMP.__default.escapeIdent(_1540_name)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(": ")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _1548_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _1551_recIdents);
-            }
-            _1539_i = (_1539_i) + (BigInteger.One);
-          }
-          s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" })"));
-          isOwned = true;
-          isErased = false;
-        }
-      } else if (_source48.is_Convert) {
-        DAST._IExpression _1552___mcc_h23 = _source48.dtor_value;
-        DAST._IType _1553___mcc_h24 = _source48.dtor_from;
-        DAST._IType _1554___mcc_h25 = _source48.dtor_typ;
-        DAST._IType _1555_toTpe = _1554___mcc_h25;
-        DAST._IType _1556_fromTpe = _1553___mcc_h24;
-        DAST._IExpression _1557_expr = _1552___mcc_h23;
-        {
-          if (object.Equals(_1556_fromTpe, _1555_toTpe)) {
-            Dafny.ISequence<Dafny.Rune> _1558_recursiveGen;
-            bool _1559_recOwned;
-            bool _1560_recErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1561_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out215;
-            bool _out216;
-            bool _out217;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out218;
-            DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out215, out _out216, out _out217, out _out218);
-            _1558_recursiveGen = _out215;
-            _1559_recOwned = _out216;
-            _1560_recErased = _out217;
-            _1561_recIdents = _out218;
-            s = _1558_recursiveGen;
-            isOwned = _1559_recOwned;
-            isErased = _1560_recErased;
-            readIdents = _1561_recIdents;
-          } else {
-            _System._ITuple2<DAST._IType, DAST._IType> _source54 = _System.Tuple2<DAST._IType, DAST._IType>.create(_1556_fromTpe, _1555_toTpe);
-            DAST._IType _1562___mcc_h305 = _source54.dtor__0;
-            DAST._IType _1563___mcc_h306 = _source54.dtor__1;
-            DAST._IType _source55 = _1562___mcc_h305;
-            if (_source55.is_Path) {
-              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1564___mcc_h309 = _source55.dtor_Path_a0;
-              Dafny.ISequence<DAST._IType> _1565___mcc_h310 = _source55.dtor_typeArgs;
-              DAST._IResolvedType _1566___mcc_h311 = _source55.dtor_resolved;
-              DAST._IResolvedType _source56 = _1566___mcc_h311;
-              if (_source56.is_Datatype) {
-                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1567___mcc_h321 = _source56.dtor_path;
-                DAST._IType _source57 = _1563___mcc_h306;
-                if (_source57.is_Path) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1568___mcc_h325 = _source57.dtor_Path_a0;
-                  Dafny.ISequence<DAST._IType> _1569___mcc_h326 = _source57.dtor_typeArgs;
-                  DAST._IResolvedType _1570___mcc_h327 = _source57.dtor_resolved;
-                  DAST._IResolvedType _source58 = _1570___mcc_h327;
-                  if (_source58.is_Datatype) {
-                    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1571___mcc_h331 = _source58.dtor_path;
-                    {
-                      Dafny.ISequence<Dafny.Rune> _1572_recursiveGen;
-                      bool _1573_recOwned;
-                      bool _1574_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1575_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out219;
-                      bool _out220;
-                      bool _out221;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out222;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out219, out _out220, out _out221, out _out222);
-                      _1572_recursiveGen = _out219;
-                      _1573_recOwned = _out220;
-                      _1574_recErased = _out221;
-                      _1575_recIdents = _out222;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1572_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                      isOwned = _1573_recOwned;
-                      isErased = _1574_recErased;
-                      readIdents = _1575_recIdents;
-                    }
-                  } else if (_source58.is_Trait) {
-                    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1576___mcc_h333 = _source58.dtor_path;
-                    {
-                      Dafny.ISequence<Dafny.Rune> _1577_recursiveGen;
-                      bool _1578_recOwned;
-                      bool _1579_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1580_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out223;
-                      bool _out224;
-                      bool _out225;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out226;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out223, out _out224, out _out225, out _out226);
-                      _1577_recursiveGen = _out223;
-                      _1578_recOwned = _out224;
-                      _1579_recErased = _out225;
-                      _1580_recIdents = _out226;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1577_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                      isOwned = _1578_recOwned;
-                      isErased = _1579_recErased;
-                      readIdents = _1580_recIdents;
-                    }
-                  } else {
-                    DAST._IType _1581___mcc_h335 = _source58.dtor_Newtype_a0;
-                    DAST._IType _1582_b = _1581___mcc_h335;
-                    {
-                      if (object.Equals(_1556_fromTpe, _1582_b)) {
-                        Dafny.ISequence<Dafny.Rune> _1583_recursiveGen;
-                        bool _1584_recOwned;
-                        bool _1585_recErased;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1586_recIdents;
-                        Dafny.ISequence<Dafny.Rune> _out227;
-                        bool _out228;
-                        bool _out229;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out230;
-                        DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out227, out _out228, out _out229, out _out230);
-                        _1583_recursiveGen = _out227;
-                        _1584_recOwned = _out228;
-                        _1585_recErased = _out229;
-                        _1586_recIdents = _out230;
-                        Dafny.ISequence<Dafny.Rune> _1587_rhsType;
-                        Dafny.ISequence<Dafny.Rune> _out231;
-                        _out231 = DCOMP.COMP.GenType(_1555_toTpe, true, false);
-                        _1587_rhsType = _out231;
-                        Dafny.ISequence<Dafny.Rune> _1588_uneraseFn;
-                        _1588_uneraseFn = ((_1584_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase")));
-                        s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _1587_rhsType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ::dafny_runtime::DafnyUnerasable<_>>::")), _1588_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _1583_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                        isOwned = _1584_recOwned;
-                        isErased = false;
-                        readIdents = _1586_recIdents;
-                      } else {
-                        Dafny.ISequence<Dafny.Rune> _out232;
-                        bool _out233;
-                        bool _out234;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out235;
-                        DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _1582_b), _1582_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out232, out _out233, out _out234, out _out235);
-                        s = _out232;
-                        isOwned = _out233;
-                        isErased = _out234;
-                        readIdents = _out235;
-                      }
-                    }
-                  }
-                } else if (_source57.is_Nullable) {
-                  DAST._IType _1589___mcc_h337 = _source57.dtor_Nullable_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1590_recursiveGen;
-                    bool _1591_recOwned;
-                    bool _1592_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1593_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out236;
-                    bool _out237;
-                    bool _out238;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out239;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out236, out _out237, out _out238, out _out239);
-                    _1590_recursiveGen = _out236;
-                    _1591_recOwned = _out237;
-                    _1592_recErased = _out238;
-                    _1593_recIdents = _out239;
-                    if (!(_1591_recOwned)) {
-                      _1590_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_1590_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".clone()"));
-                    }
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Some("), _1590_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                    isOwned = true;
-                    isErased = _1592_recErased;
-                    readIdents = _1593_recIdents;
-                  }
-                } else if (_source57.is_Tuple) {
-                  Dafny.ISequence<DAST._IType> _1594___mcc_h339 = _source57.dtor_Tuple_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1595_recursiveGen;
-                    bool _1596_recOwned;
-                    bool _1597_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1598_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out240;
-                    bool _out241;
-                    bool _out242;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out243;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out240, out _out241, out _out242, out _out243);
-                    _1595_recursiveGen = _out240;
-                    _1596_recOwned = _out241;
-                    _1597_recErased = _out242;
-                    _1598_recIdents = _out243;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1595_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _1596_recOwned;
-                    isErased = _1597_recErased;
-                    readIdents = _1598_recIdents;
-                  }
-                } else if (_source57.is_Array) {
-                  DAST._IType _1599___mcc_h341 = _source57.dtor_element;
-                  BigInteger _1600___mcc_h342 = _source57.dtor_dims;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1601_recursiveGen;
-                    bool _1602_recOwned;
-                    bool _1603_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1604_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out244;
-                    bool _out245;
-                    bool _out246;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out247;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out244, out _out245, out _out246, out _out247);
-                    _1601_recursiveGen = _out244;
-                    _1602_recOwned = _out245;
-                    _1603_recErased = _out246;
-                    _1604_recIdents = _out247;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1601_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _1602_recOwned;
-                    isErased = _1603_recErased;
-                    readIdents = _1604_recIdents;
-                  }
-                } else if (_source57.is_Seq) {
-                  DAST._IType _1605___mcc_h345 = _source57.dtor_element;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1606_recursiveGen;
-                    bool _1607_recOwned;
-                    bool _1608_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1609_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out248;
-                    bool _out249;
-                    bool _out250;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out251;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out248, out _out249, out _out250, out _out251);
-                    _1606_recursiveGen = _out248;
-                    _1607_recOwned = _out249;
-                    _1608_recErased = _out250;
-                    _1609_recIdents = _out251;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1606_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _1607_recOwned;
-                    isErased = _1608_recErased;
-                    readIdents = _1609_recIdents;
-                  }
-                } else if (_source57.is_Set) {
-                  DAST._IType _1610___mcc_h347 = _source57.dtor_element;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1611_recursiveGen;
-                    bool _1612_recOwned;
-                    bool _1613_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1614_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out252;
-                    bool _out253;
-                    bool _out254;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out255;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out252, out _out253, out _out254, out _out255);
-                    _1611_recursiveGen = _out252;
-                    _1612_recOwned = _out253;
-                    _1613_recErased = _out254;
-                    _1614_recIdents = _out255;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1611_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _1612_recOwned;
-                    isErased = _1613_recErased;
-                    readIdents = _1614_recIdents;
-                  }
-                } else if (_source57.is_Multiset) {
-                  DAST._IType _1615___mcc_h349 = _source57.dtor_element;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1616_recursiveGen;
-                    bool _1617_recOwned;
-                    bool _1618_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1619_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out256;
-                    bool _out257;
-                    bool _out258;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out259;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out256, out _out257, out _out258, out _out259);
-                    _1616_recursiveGen = _out256;
-                    _1617_recOwned = _out257;
-                    _1618_recErased = _out258;
-                    _1619_recIdents = _out259;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1616_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _1617_recOwned;
-                    isErased = _1618_recErased;
-                    readIdents = _1619_recIdents;
-                  }
-                } else if (_source57.is_Map) {
-                  DAST._IType _1620___mcc_h351 = _source57.dtor_key;
-                  DAST._IType _1621___mcc_h352 = _source57.dtor_value;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1622_recursiveGen;
-                    bool _1623_recOwned;
-                    bool _1624_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1625_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out260;
-                    bool _out261;
-                    bool _out262;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out263;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out260, out _out261, out _out262, out _out263);
-                    _1622_recursiveGen = _out260;
-                    _1623_recOwned = _out261;
-                    _1624_recErased = _out262;
-                    _1625_recIdents = _out263;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1622_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _1623_recOwned;
-                    isErased = _1624_recErased;
-                    readIdents = _1625_recIdents;
-                  }
-                } else if (_source57.is_Arrow) {
-                  Dafny.ISequence<DAST._IType> _1626___mcc_h355 = _source57.dtor_args;
-                  DAST._IType _1627___mcc_h356 = _source57.dtor_result;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1628_recursiveGen;
-                    bool _1629_recOwned;
-                    bool _1630_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1631_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out264;
-                    bool _out265;
-                    bool _out266;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out267;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out264, out _out265, out _out266, out _out267);
-                    _1628_recursiveGen = _out264;
-                    _1629_recOwned = _out265;
-                    _1630_recErased = _out266;
-                    _1631_recIdents = _out267;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1628_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _1629_recOwned;
-                    isErased = _1630_recErased;
-                    readIdents = _1631_recIdents;
-                  }
-                } else if (_source57.is_Primitive) {
-                  DAST._IPrimitive _1632___mcc_h359 = _source57.dtor_Primitive_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1633_recursiveGen;
-                    bool _1634_recOwned;
-                    bool _1635_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1636_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out268;
-                    bool _out269;
-                    bool _out270;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out271;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out268, out _out269, out _out270, out _out271);
-                    _1633_recursiveGen = _out268;
-                    _1634_recOwned = _out269;
-                    _1635_recErased = _out270;
-                    _1636_recIdents = _out271;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1633_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _1634_recOwned;
-                    isErased = _1635_recErased;
-                    readIdents = _1636_recIdents;
-                  }
-                } else if (_source57.is_Passthrough) {
-                  Dafny.ISequence<Dafny.Rune> _1637___mcc_h361 = _source57.dtor_Passthrough_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1638_recursiveGen;
-                    bool _1639_recOwned;
-                    bool _1640_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1641_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out272;
-                    bool _out273;
-                    bool _out274;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out275;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out272, out _out273, out _out274, out _out275);
-                    _1638_recursiveGen = _out272;
-                    _1639_recOwned = _out273;
-                    _1640_recErased = _out274;
-                    _1641_recIdents = _out275;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1638_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _1639_recOwned;
-                    isErased = _1640_recErased;
-                    readIdents = _1641_recIdents;
-                  }
-                } else {
-                  Dafny.ISequence<Dafny.Rune> _1642___mcc_h363 = _source57.dtor_TypeArg_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1643_recursiveGen;
-                    bool _1644_recOwned;
-                    bool _1645_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1646_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out276;
-                    bool _out277;
-                    bool _out278;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out279;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out276, out _out277, out _out278, out _out279);
-                    _1643_recursiveGen = _out276;
-                    _1644_recOwned = _out277;
-                    _1645_recErased = _out278;
-                    _1646_recIdents = _out279;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1643_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _1644_recOwned;
-                    isErased = _1645_recErased;
-                    readIdents = _1646_recIdents;
-                  }
-                }
-              } else if (_source56.is_Trait) {
-                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1647___mcc_h365 = _source56.dtor_path;
-                DAST._IType _source59 = _1563___mcc_h306;
-                if (_source59.is_Path) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1648___mcc_h369 = _source59.dtor_Path_a0;
-                  Dafny.ISequence<DAST._IType> _1649___mcc_h370 = _source59.dtor_typeArgs;
-                  DAST._IResolvedType _1650___mcc_h371 = _source59.dtor_resolved;
-                  DAST._IResolvedType _source60 = _1650___mcc_h371;
-                  if (_source60.is_Datatype) {
-                    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1651___mcc_h375 = _source60.dtor_path;
-                    {
-                      Dafny.ISequence<Dafny.Rune> _1652_recursiveGen;
-                      bool _1653_recOwned;
-                      bool _1654_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1655_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out280;
-                      bool _out281;
-                      bool _out282;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out283;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out280, out _out281, out _out282, out _out283);
-                      _1652_recursiveGen = _out280;
-                      _1653_recOwned = _out281;
-                      _1654_recErased = _out282;
-                      _1655_recIdents = _out283;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1652_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                      isOwned = _1653_recOwned;
-                      isErased = _1654_recErased;
-                      readIdents = _1655_recIdents;
-                    }
-                  } else if (_source60.is_Trait) {
-                    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1656___mcc_h377 = _source60.dtor_path;
-                    {
-                      Dafny.ISequence<Dafny.Rune> _1657_recursiveGen;
-                      bool _1658_recOwned;
-                      bool _1659_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1660_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out284;
-                      bool _out285;
-                      bool _out286;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out287;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out284, out _out285, out _out286, out _out287);
-                      _1657_recursiveGen = _out284;
-                      _1658_recOwned = _out285;
-                      _1659_recErased = _out286;
-                      _1660_recIdents = _out287;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1657_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                      isOwned = _1658_recOwned;
-                      isErased = _1659_recErased;
-                      readIdents = _1660_recIdents;
-                    }
-                  } else {
-                    DAST._IType _1661___mcc_h379 = _source60.dtor_Newtype_a0;
-                    DAST._IType _1662_b = _1661___mcc_h379;
-                    {
-                      if (object.Equals(_1556_fromTpe, _1662_b)) {
-                        Dafny.ISequence<Dafny.Rune> _1663_recursiveGen;
-                        bool _1664_recOwned;
-                        bool _1665_recErased;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1666_recIdents;
-                        Dafny.ISequence<Dafny.Rune> _out288;
-                        bool _out289;
-                        bool _out290;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out291;
-                        DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out288, out _out289, out _out290, out _out291);
-                        _1663_recursiveGen = _out288;
-                        _1664_recOwned = _out289;
-                        _1665_recErased = _out290;
-                        _1666_recIdents = _out291;
-                        Dafny.ISequence<Dafny.Rune> _1667_rhsType;
-                        Dafny.ISequence<Dafny.Rune> _out292;
-                        _out292 = DCOMP.COMP.GenType(_1555_toTpe, true, false);
-                        _1667_rhsType = _out292;
-                        Dafny.ISequence<Dafny.Rune> _1668_uneraseFn;
-                        _1668_uneraseFn = ((_1664_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase")));
-                        s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _1667_rhsType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ::dafny_runtime::DafnyUnerasable<_>>::")), _1668_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _1663_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                        isOwned = _1664_recOwned;
-                        isErased = false;
-                        readIdents = _1666_recIdents;
-                      } else {
-                        Dafny.ISequence<Dafny.Rune> _out293;
-                        bool _out294;
-                        bool _out295;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out296;
-                        DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _1662_b), _1662_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out293, out _out294, out _out295, out _out296);
-                        s = _out293;
-                        isOwned = _out294;
-                        isErased = _out295;
-                        readIdents = _out296;
-                      }
-                    }
-                  }
-                } else if (_source59.is_Nullable) {
-                  DAST._IType _1669___mcc_h381 = _source59.dtor_Nullable_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1670_recursiveGen;
-                    bool _1671_recOwned;
-                    bool _1672_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1673_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out297;
-                    bool _out298;
-                    bool _out299;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out300;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out297, out _out298, out _out299, out _out300);
-                    _1670_recursiveGen = _out297;
-                    _1671_recOwned = _out298;
-                    _1672_recErased = _out299;
-                    _1673_recIdents = _out300;
-                    if (!(_1671_recOwned)) {
-                      _1670_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_1670_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".clone()"));
-                    }
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Some("), _1670_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                    isOwned = true;
-                    isErased = _1672_recErased;
-                    readIdents = _1673_recIdents;
-                  }
-                } else if (_source59.is_Tuple) {
-                  Dafny.ISequence<DAST._IType> _1674___mcc_h383 = _source59.dtor_Tuple_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1675_recursiveGen;
-                    bool _1676_recOwned;
-                    bool _1677_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1678_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out301;
-                    bool _out302;
-                    bool _out303;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out304;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out301, out _out302, out _out303, out _out304);
-                    _1675_recursiveGen = _out301;
-                    _1676_recOwned = _out302;
-                    _1677_recErased = _out303;
-                    _1678_recIdents = _out304;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1675_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _1676_recOwned;
-                    isErased = _1677_recErased;
-                    readIdents = _1678_recIdents;
-                  }
-                } else if (_source59.is_Array) {
-                  DAST._IType _1679___mcc_h385 = _source59.dtor_element;
-                  BigInteger _1680___mcc_h386 = _source59.dtor_dims;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1681_recursiveGen;
-                    bool _1682_recOwned;
-                    bool _1683_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1684_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out305;
-                    bool _out306;
-                    bool _out307;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out308;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out305, out _out306, out _out307, out _out308);
-                    _1681_recursiveGen = _out305;
-                    _1682_recOwned = _out306;
-                    _1683_recErased = _out307;
-                    _1684_recIdents = _out308;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1681_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _1682_recOwned;
-                    isErased = _1683_recErased;
-                    readIdents = _1684_recIdents;
-                  }
-                } else if (_source59.is_Seq) {
-                  DAST._IType _1685___mcc_h389 = _source59.dtor_element;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1686_recursiveGen;
-                    bool _1687_recOwned;
-                    bool _1688_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1689_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out309;
-                    bool _out310;
-                    bool _out311;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out312;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out309, out _out310, out _out311, out _out312);
-                    _1686_recursiveGen = _out309;
-                    _1687_recOwned = _out310;
-                    _1688_recErased = _out311;
-                    _1689_recIdents = _out312;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1686_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _1687_recOwned;
-                    isErased = _1688_recErased;
-                    readIdents = _1689_recIdents;
-                  }
-                } else if (_source59.is_Set) {
-                  DAST._IType _1690___mcc_h391 = _source59.dtor_element;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1691_recursiveGen;
-                    bool _1692_recOwned;
-                    bool _1693_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1694_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out313;
-                    bool _out314;
-                    bool _out315;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out316;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out313, out _out314, out _out315, out _out316);
-                    _1691_recursiveGen = _out313;
-                    _1692_recOwned = _out314;
-                    _1693_recErased = _out315;
-                    _1694_recIdents = _out316;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1691_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _1692_recOwned;
-                    isErased = _1693_recErased;
-                    readIdents = _1694_recIdents;
-                  }
-                } else if (_source59.is_Multiset) {
-                  DAST._IType _1695___mcc_h393 = _source59.dtor_element;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1696_recursiveGen;
-                    bool _1697_recOwned;
-                    bool _1698_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1699_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out317;
-                    bool _out318;
-                    bool _out319;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out320;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out317, out _out318, out _out319, out _out320);
-                    _1696_recursiveGen = _out317;
-                    _1697_recOwned = _out318;
-                    _1698_recErased = _out319;
-                    _1699_recIdents = _out320;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1696_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _1697_recOwned;
-                    isErased = _1698_recErased;
-                    readIdents = _1699_recIdents;
-                  }
-                } else if (_source59.is_Map) {
-                  DAST._IType _1700___mcc_h395 = _source59.dtor_key;
-                  DAST._IType _1701___mcc_h396 = _source59.dtor_value;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1702_recursiveGen;
-                    bool _1703_recOwned;
-                    bool _1704_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1705_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out321;
-                    bool _out322;
-                    bool _out323;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out324;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out321, out _out322, out _out323, out _out324);
-                    _1702_recursiveGen = _out321;
-                    _1703_recOwned = _out322;
-                    _1704_recErased = _out323;
-                    _1705_recIdents = _out324;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1702_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _1703_recOwned;
-                    isErased = _1704_recErased;
-                    readIdents = _1705_recIdents;
-                  }
-                } else if (_source59.is_Arrow) {
-                  Dafny.ISequence<DAST._IType> _1706___mcc_h399 = _source59.dtor_args;
-                  DAST._IType _1707___mcc_h400 = _source59.dtor_result;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1708_recursiveGen;
-                    bool _1709_recOwned;
-                    bool _1710_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1711_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out325;
-                    bool _out326;
-                    bool _out327;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out328;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out325, out _out326, out _out327, out _out328);
-                    _1708_recursiveGen = _out325;
-                    _1709_recOwned = _out326;
-                    _1710_recErased = _out327;
-                    _1711_recIdents = _out328;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1708_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _1709_recOwned;
-                    isErased = _1710_recErased;
-                    readIdents = _1711_recIdents;
-                  }
-                } else if (_source59.is_Primitive) {
-                  DAST._IPrimitive _1712___mcc_h403 = _source59.dtor_Primitive_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1713_recursiveGen;
-                    bool _1714_recOwned;
-                    bool _1715_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1716_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out329;
-                    bool _out330;
-                    bool _out331;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out332;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out329, out _out330, out _out331, out _out332);
-                    _1713_recursiveGen = _out329;
-                    _1714_recOwned = _out330;
-                    _1715_recErased = _out331;
-                    _1716_recIdents = _out332;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1713_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _1714_recOwned;
-                    isErased = _1715_recErased;
-                    readIdents = _1716_recIdents;
-                  }
-                } else if (_source59.is_Passthrough) {
-                  Dafny.ISequence<Dafny.Rune> _1717___mcc_h405 = _source59.dtor_Passthrough_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1718_recursiveGen;
-                    bool _1719_recOwned;
-                    bool _1720_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1721_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out333;
-                    bool _out334;
-                    bool _out335;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out336;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out333, out _out334, out _out335, out _out336);
-                    _1718_recursiveGen = _out333;
-                    _1719_recOwned = _out334;
-                    _1720_recErased = _out335;
-                    _1721_recIdents = _out336;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1718_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _1719_recOwned;
-                    isErased = _1720_recErased;
-                    readIdents = _1721_recIdents;
-                  }
-                } else {
-                  Dafny.ISequence<Dafny.Rune> _1722___mcc_h407 = _source59.dtor_TypeArg_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1723_recursiveGen;
-                    bool _1724_recOwned;
-                    bool _1725_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1726_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out337;
-                    bool _out338;
-                    bool _out339;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out340;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out337, out _out338, out _out339, out _out340);
-                    _1723_recursiveGen = _out337;
-                    _1724_recOwned = _out338;
-                    _1725_recErased = _out339;
-                    _1726_recIdents = _out340;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1723_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _1724_recOwned;
-                    isErased = _1725_recErased;
-                    readIdents = _1726_recIdents;
-                  }
-                }
-              } else {
-                DAST._IType _1727___mcc_h409 = _source56.dtor_Newtype_a0;
-                DAST._IType _source61 = _1563___mcc_h306;
-                if (_source61.is_Path) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1728___mcc_h413 = _source61.dtor_Path_a0;
-                  Dafny.ISequence<DAST._IType> _1729___mcc_h414 = _source61.dtor_typeArgs;
-                  DAST._IResolvedType _1730___mcc_h415 = _source61.dtor_resolved;
-                  DAST._IResolvedType _source62 = _1730___mcc_h415;
-                  if (_source62.is_Datatype) {
-                    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1731___mcc_h422 = _source62.dtor_path;
-                    DAST._IType _1732_b = _1727___mcc_h409;
-                    {
-                      if (object.Equals(_1732_b, _1555_toTpe)) {
-                        Dafny.ISequence<Dafny.Rune> _1733_recursiveGen;
-                        bool _1734_recOwned;
-                        bool _1735_recErased;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1736_recIdents;
-                        Dafny.ISequence<Dafny.Rune> _out341;
-                        bool _out342;
-                        bool _out343;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out344;
-                        DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out341, out _out342, out _out343, out _out344);
-                        _1733_recursiveGen = _out341;
-                        _1734_recOwned = _out342;
-                        _1735_recErased = _out343;
-                        _1736_recIdents = _out344;
-                        Dafny.ISequence<Dafny.Rune> _1737_uneraseFn;
-                        _1737_uneraseFn = ((_1734_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase")));
-                        s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::"), _1737_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _1733_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                        isOwned = _1734_recOwned;
-                        isErased = true;
-                        readIdents = _1736_recIdents;
-                      } else {
-                        Dafny.ISequence<Dafny.Rune> _out345;
-                        bool _out346;
-                        bool _out347;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out348;
-                        DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _1732_b), _1732_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out345, out _out346, out _out347, out _out348);
-                        s = _out345;
-                        isOwned = _out346;
-                        isErased = _out347;
-                        readIdents = _out348;
-                      }
-                    }
-                  } else if (_source62.is_Trait) {
-                    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1738___mcc_h425 = _source62.dtor_path;
-                    DAST._IType _1739_b = _1727___mcc_h409;
-                    {
-                      if (object.Equals(_1739_b, _1555_toTpe)) {
-                        Dafny.ISequence<Dafny.Rune> _1740_recursiveGen;
-                        bool _1741_recOwned;
-                        bool _1742_recErased;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1743_recIdents;
-                        Dafny.ISequence<Dafny.Rune> _out349;
-                        bool _out350;
-                        bool _out351;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out352;
-                        DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out349, out _out350, out _out351, out _out352);
-                        _1740_recursiveGen = _out349;
-                        _1741_recOwned = _out350;
-                        _1742_recErased = _out351;
-                        _1743_recIdents = _out352;
-                        Dafny.ISequence<Dafny.Rune> _1744_uneraseFn;
-                        _1744_uneraseFn = ((_1741_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase")));
-                        s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::"), _1744_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _1740_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                        isOwned = _1741_recOwned;
-                        isErased = true;
-                        readIdents = _1743_recIdents;
-                      } else {
-                        Dafny.ISequence<Dafny.Rune> _out353;
-                        bool _out354;
-                        bool _out355;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out356;
-                        DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _1739_b), _1739_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out353, out _out354, out _out355, out _out356);
-                        s = _out353;
-                        isOwned = _out354;
-                        isErased = _out355;
-                        readIdents = _out356;
-                      }
-                    }
-                  } else {
-                    DAST._IType _1745___mcc_h428 = _source62.dtor_Newtype_a0;
-                    DAST._IType _1746_b = _1745___mcc_h428;
-                    {
-                      if (object.Equals(_1556_fromTpe, _1746_b)) {
-                        Dafny.ISequence<Dafny.Rune> _1747_recursiveGen;
-                        bool _1748_recOwned;
-                        bool _1749_recErased;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1750_recIdents;
-                        Dafny.ISequence<Dafny.Rune> _out357;
-                        bool _out358;
-                        bool _out359;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out360;
-                        DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out357, out _out358, out _out359, out _out360);
-                        _1747_recursiveGen = _out357;
-                        _1748_recOwned = _out358;
-                        _1749_recErased = _out359;
-                        _1750_recIdents = _out360;
-                        Dafny.ISequence<Dafny.Rune> _1751_rhsType;
-                        Dafny.ISequence<Dafny.Rune> _out361;
-                        _out361 = DCOMP.COMP.GenType(_1555_toTpe, true, false);
-                        _1751_rhsType = _out361;
-                        Dafny.ISequence<Dafny.Rune> _1752_uneraseFn;
-                        _1752_uneraseFn = ((_1748_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase")));
-                        s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _1751_rhsType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ::dafny_runtime::DafnyUnerasable<_>>::")), _1752_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _1747_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                        isOwned = _1748_recOwned;
-                        isErased = false;
-                        readIdents = _1750_recIdents;
-                      } else {
-                        Dafny.ISequence<Dafny.Rune> _out362;
-                        bool _out363;
-                        bool _out364;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out365;
-                        DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _1746_b), _1746_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out362, out _out363, out _out364, out _out365);
-                        s = _out362;
-                        isOwned = _out363;
-                        isErased = _out364;
-                        readIdents = _out365;
-                      }
-                    }
-                  }
-                } else if (_source61.is_Nullable) {
-                  DAST._IType _1753___mcc_h431 = _source61.dtor_Nullable_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1754_recursiveGen;
-                    bool _1755_recOwned;
-                    bool _1756_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1757_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out366;
-                    bool _out367;
-                    bool _out368;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out369;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out366, out _out367, out _out368, out _out369);
-                    _1754_recursiveGen = _out366;
-                    _1755_recOwned = _out367;
-                    _1756_recErased = _out368;
-                    _1757_recIdents = _out369;
-                    if (!(_1755_recOwned)) {
-                      _1754_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_1754_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".clone()"));
-                    }
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Some("), _1754_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                    isOwned = true;
-                    isErased = _1756_recErased;
-                    readIdents = _1757_recIdents;
-                  }
-                } else if (_source61.is_Tuple) {
-                  Dafny.ISequence<DAST._IType> _1758___mcc_h434 = _source61.dtor_Tuple_a0;
-                  DAST._IType _1759_b = _1727___mcc_h409;
-                  {
-                    if (object.Equals(_1759_b, _1555_toTpe)) {
-                      Dafny.ISequence<Dafny.Rune> _1760_recursiveGen;
-                      bool _1761_recOwned;
-                      bool _1762_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1763_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out370;
-                      bool _out371;
-                      bool _out372;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out373;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out370, out _out371, out _out372, out _out373);
-                      _1760_recursiveGen = _out370;
-                      _1761_recOwned = _out371;
-                      _1762_recErased = _out372;
-                      _1763_recIdents = _out373;
-                      Dafny.ISequence<Dafny.Rune> _1764_uneraseFn;
-                      _1764_uneraseFn = ((_1761_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase")));
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::"), _1764_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _1760_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                      isOwned = _1761_recOwned;
-                      isErased = true;
-                      readIdents = _1763_recIdents;
-                    } else {
-                      Dafny.ISequence<Dafny.Rune> _out374;
-                      bool _out375;
-                      bool _out376;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out377;
-                      DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _1759_b), _1759_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out374, out _out375, out _out376, out _out377);
-                      s = _out374;
-                      isOwned = _out375;
-                      isErased = _out376;
-                      readIdents = _out377;
-                    }
-                  }
-                } else if (_source61.is_Array) {
-                  DAST._IType _1765___mcc_h437 = _source61.dtor_element;
-                  BigInteger _1766___mcc_h438 = _source61.dtor_dims;
-                  DAST._IType _1767_b = _1727___mcc_h409;
-                  {
-                    if (object.Equals(_1767_b, _1555_toTpe)) {
-                      Dafny.ISequence<Dafny.Rune> _1768_recursiveGen;
-                      bool _1769_recOwned;
-                      bool _1770_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1771_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out378;
-                      bool _out379;
-                      bool _out380;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out381;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out378, out _out379, out _out380, out _out381);
-                      _1768_recursiveGen = _out378;
-                      _1769_recOwned = _out379;
-                      _1770_recErased = _out380;
-                      _1771_recIdents = _out381;
-                      Dafny.ISequence<Dafny.Rune> _1772_uneraseFn;
-                      _1772_uneraseFn = ((_1769_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase")));
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::"), _1772_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _1768_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                      isOwned = _1769_recOwned;
-                      isErased = true;
-                      readIdents = _1771_recIdents;
-                    } else {
-                      Dafny.ISequence<Dafny.Rune> _out382;
-                      bool _out383;
-                      bool _out384;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out385;
-                      DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _1767_b), _1767_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out382, out _out383, out _out384, out _out385);
-                      s = _out382;
-                      isOwned = _out383;
-                      isErased = _out384;
-                      readIdents = _out385;
-                    }
-                  }
-                } else if (_source61.is_Seq) {
-                  DAST._IType _1773___mcc_h443 = _source61.dtor_element;
-                  DAST._IType _1774_b = _1727___mcc_h409;
-                  {
-                    if (object.Equals(_1774_b, _1555_toTpe)) {
-                      Dafny.ISequence<Dafny.Rune> _1775_recursiveGen;
-                      bool _1776_recOwned;
-                      bool _1777_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1778_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out386;
-                      bool _out387;
-                      bool _out388;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out389;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out386, out _out387, out _out388, out _out389);
-                      _1775_recursiveGen = _out386;
-                      _1776_recOwned = _out387;
-                      _1777_recErased = _out388;
-                      _1778_recIdents = _out389;
-                      Dafny.ISequence<Dafny.Rune> _1779_uneraseFn;
-                      _1779_uneraseFn = ((_1776_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase")));
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::"), _1779_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _1775_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                      isOwned = _1776_recOwned;
-                      isErased = true;
-                      readIdents = _1778_recIdents;
-                    } else {
-                      Dafny.ISequence<Dafny.Rune> _out390;
-                      bool _out391;
-                      bool _out392;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out393;
-                      DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _1774_b), _1774_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out390, out _out391, out _out392, out _out393);
-                      s = _out390;
-                      isOwned = _out391;
-                      isErased = _out392;
-                      readIdents = _out393;
-                    }
-                  }
-                } else if (_source61.is_Set) {
-                  DAST._IType _1780___mcc_h446 = _source61.dtor_element;
-                  DAST._IType _1781_b = _1727___mcc_h409;
-                  {
-                    if (object.Equals(_1781_b, _1555_toTpe)) {
-                      Dafny.ISequence<Dafny.Rune> _1782_recursiveGen;
-                      bool _1783_recOwned;
-                      bool _1784_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1785_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out394;
-                      bool _out395;
-                      bool _out396;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out397;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out394, out _out395, out _out396, out _out397);
-                      _1782_recursiveGen = _out394;
-                      _1783_recOwned = _out395;
-                      _1784_recErased = _out396;
-                      _1785_recIdents = _out397;
-                      Dafny.ISequence<Dafny.Rune> _1786_uneraseFn;
-                      _1786_uneraseFn = ((_1783_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase")));
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::"), _1786_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _1782_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                      isOwned = _1783_recOwned;
-                      isErased = true;
-                      readIdents = _1785_recIdents;
-                    } else {
-                      Dafny.ISequence<Dafny.Rune> _out398;
-                      bool _out399;
-                      bool _out400;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out401;
-                      DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _1781_b), _1781_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out398, out _out399, out _out400, out _out401);
-                      s = _out398;
-                      isOwned = _out399;
-                      isErased = _out400;
-                      readIdents = _out401;
-                    }
-                  }
-                } else if (_source61.is_Multiset) {
-                  DAST._IType _1787___mcc_h449 = _source61.dtor_element;
-                  DAST._IType _1788_b = _1727___mcc_h409;
-                  {
-                    if (object.Equals(_1788_b, _1555_toTpe)) {
-                      Dafny.ISequence<Dafny.Rune> _1789_recursiveGen;
-                      bool _1790_recOwned;
-                      bool _1791_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1792_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out402;
-                      bool _out403;
-                      bool _out404;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out405;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out402, out _out403, out _out404, out _out405);
-                      _1789_recursiveGen = _out402;
-                      _1790_recOwned = _out403;
-                      _1791_recErased = _out404;
-                      _1792_recIdents = _out405;
-                      Dafny.ISequence<Dafny.Rune> _1793_uneraseFn;
-                      _1793_uneraseFn = ((_1790_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase")));
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::"), _1793_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _1789_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                      isOwned = _1790_recOwned;
-                      isErased = true;
-                      readIdents = _1792_recIdents;
-                    } else {
-                      Dafny.ISequence<Dafny.Rune> _out406;
-                      bool _out407;
-                      bool _out408;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out409;
-                      DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _1788_b), _1788_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out406, out _out407, out _out408, out _out409);
-                      s = _out406;
-                      isOwned = _out407;
-                      isErased = _out408;
-                      readIdents = _out409;
-                    }
-                  }
-                } else if (_source61.is_Map) {
-                  DAST._IType _1794___mcc_h452 = _source61.dtor_key;
-                  DAST._IType _1795___mcc_h453 = _source61.dtor_value;
-                  DAST._IType _1796_b = _1727___mcc_h409;
-                  {
-                    if (object.Equals(_1796_b, _1555_toTpe)) {
-                      Dafny.ISequence<Dafny.Rune> _1797_recursiveGen;
-                      bool _1798_recOwned;
-                      bool _1799_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1800_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out410;
-                      bool _out411;
-                      bool _out412;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out413;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out410, out _out411, out _out412, out _out413);
-                      _1797_recursiveGen = _out410;
-                      _1798_recOwned = _out411;
-                      _1799_recErased = _out412;
-                      _1800_recIdents = _out413;
-                      Dafny.ISequence<Dafny.Rune> _1801_uneraseFn;
-                      _1801_uneraseFn = ((_1798_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase")));
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::"), _1801_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _1797_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                      isOwned = _1798_recOwned;
-                      isErased = true;
-                      readIdents = _1800_recIdents;
-                    } else {
-                      Dafny.ISequence<Dafny.Rune> _out414;
-                      bool _out415;
-                      bool _out416;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out417;
-                      DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _1796_b), _1796_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out414, out _out415, out _out416, out _out417);
-                      s = _out414;
-                      isOwned = _out415;
-                      isErased = _out416;
-                      readIdents = _out417;
-                    }
-                  }
-                } else if (_source61.is_Arrow) {
-                  Dafny.ISequence<DAST._IType> _1802___mcc_h458 = _source61.dtor_args;
-                  DAST._IType _1803___mcc_h459 = _source61.dtor_result;
-                  DAST._IType _1804_b = _1727___mcc_h409;
-                  {
-                    if (object.Equals(_1804_b, _1555_toTpe)) {
-                      Dafny.ISequence<Dafny.Rune> _1805_recursiveGen;
-                      bool _1806_recOwned;
-                      bool _1807_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1808_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out418;
-                      bool _out419;
-                      bool _out420;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out421;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out418, out _out419, out _out420, out _out421);
-                      _1805_recursiveGen = _out418;
-                      _1806_recOwned = _out419;
-                      _1807_recErased = _out420;
-                      _1808_recIdents = _out421;
-                      Dafny.ISequence<Dafny.Rune> _1809_uneraseFn;
-                      _1809_uneraseFn = ((_1806_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase")));
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::"), _1809_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _1805_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                      isOwned = _1806_recOwned;
-                      isErased = true;
-                      readIdents = _1808_recIdents;
-                    } else {
-                      Dafny.ISequence<Dafny.Rune> _out422;
-                      bool _out423;
-                      bool _out424;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out425;
-                      DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _1804_b), _1804_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out422, out _out423, out _out424, out _out425);
-                      s = _out422;
-                      isOwned = _out423;
-                      isErased = _out424;
-                      readIdents = _out425;
-                    }
-                  }
-                } else if (_source61.is_Primitive) {
-                  DAST._IPrimitive _1810___mcc_h464 = _source61.dtor_Primitive_a0;
-                  DAST._IType _1811_b = _1727___mcc_h409;
-                  {
-                    if (object.Equals(_1811_b, _1555_toTpe)) {
-                      Dafny.ISequence<Dafny.Rune> _1812_recursiveGen;
-                      bool _1813_recOwned;
-                      bool _1814_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1815_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out426;
-                      bool _out427;
-                      bool _out428;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out429;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out426, out _out427, out _out428, out _out429);
-                      _1812_recursiveGen = _out426;
-                      _1813_recOwned = _out427;
-                      _1814_recErased = _out428;
-                      _1815_recIdents = _out429;
-                      Dafny.ISequence<Dafny.Rune> _1816_uneraseFn;
-                      _1816_uneraseFn = ((_1813_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase")));
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::"), _1816_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _1812_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                      isOwned = _1813_recOwned;
-                      isErased = true;
-                      readIdents = _1815_recIdents;
-                    } else {
-                      Dafny.ISequence<Dafny.Rune> _out430;
-                      bool _out431;
-                      bool _out432;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out433;
-                      DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _1811_b), _1811_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out430, out _out431, out _out432, out _out433);
-                      s = _out430;
-                      isOwned = _out431;
-                      isErased = _out432;
-                      readIdents = _out433;
-                    }
-                  }
-                } else if (_source61.is_Passthrough) {
-                  Dafny.ISequence<Dafny.Rune> _1817___mcc_h467 = _source61.dtor_Passthrough_a0;
-                  DAST._IType _1818_b = _1727___mcc_h409;
-                  {
-                    if (object.Equals(_1818_b, _1555_toTpe)) {
-                      Dafny.ISequence<Dafny.Rune> _1819_recursiveGen;
-                      bool _1820_recOwned;
-                      bool _1821_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1822_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out434;
-                      bool _out435;
-                      bool _out436;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out437;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out434, out _out435, out _out436, out _out437);
-                      _1819_recursiveGen = _out434;
-                      _1820_recOwned = _out435;
-                      _1821_recErased = _out436;
-                      _1822_recIdents = _out437;
-                      Dafny.ISequence<Dafny.Rune> _1823_uneraseFn;
-                      _1823_uneraseFn = ((_1820_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase")));
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::"), _1823_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _1819_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                      isOwned = _1820_recOwned;
-                      isErased = true;
-                      readIdents = _1822_recIdents;
-                    } else {
-                      Dafny.ISequence<Dafny.Rune> _out438;
-                      bool _out439;
-                      bool _out440;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out441;
-                      DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _1818_b), _1818_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out438, out _out439, out _out440, out _out441);
-                      s = _out438;
-                      isOwned = _out439;
-                      isErased = _out440;
-                      readIdents = _out441;
-                    }
-                  }
-                } else {
-                  Dafny.ISequence<Dafny.Rune> _1824___mcc_h470 = _source61.dtor_TypeArg_a0;
-                  DAST._IType _1825_b = _1727___mcc_h409;
-                  {
-                    if (object.Equals(_1825_b, _1555_toTpe)) {
-                      Dafny.ISequence<Dafny.Rune> _1826_recursiveGen;
-                      bool _1827_recOwned;
-                      bool _1828_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1829_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out442;
-                      bool _out443;
-                      bool _out444;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out445;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out442, out _out443, out _out444, out _out445);
-                      _1826_recursiveGen = _out442;
-                      _1827_recOwned = _out443;
-                      _1828_recErased = _out444;
-                      _1829_recIdents = _out445;
-                      Dafny.ISequence<Dafny.Rune> _1830_uneraseFn;
-                      _1830_uneraseFn = ((_1827_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase")));
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::"), _1830_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _1826_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                      isOwned = _1827_recOwned;
-                      isErased = true;
-                      readIdents = _1829_recIdents;
-                    } else {
-                      Dafny.ISequence<Dafny.Rune> _out446;
-                      bool _out447;
-                      bool _out448;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out449;
-                      DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _1825_b), _1825_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out446, out _out447, out _out448, out _out449);
-                      s = _out446;
-                      isOwned = _out447;
-                      isErased = _out448;
-                      readIdents = _out449;
-                    }
-                  }
-                }
-              }
-            } else if (_source55.is_Nullable) {
-              DAST._IType _1831___mcc_h473 = _source55.dtor_Nullable_a0;
-              DAST._IType _source63 = _1563___mcc_h306;
-              if (_source63.is_Path) {
-                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1832___mcc_h477 = _source63.dtor_Path_a0;
-                Dafny.ISequence<DAST._IType> _1833___mcc_h478 = _source63.dtor_typeArgs;
-                DAST._IResolvedType _1834___mcc_h479 = _source63.dtor_resolved;
-                DAST._IResolvedType _source64 = _1834___mcc_h479;
-                if (_source64.is_Datatype) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1835___mcc_h486 = _source64.dtor_path;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1836_recursiveGen;
-                    bool _1837_recOwned;
-                    bool _1838_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1839_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out450;
-                    bool _out451;
-                    bool _out452;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out453;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out450, out _out451, out _out452, out _out453);
-                    _1836_recursiveGen = _out450;
-                    _1837_recOwned = _out451;
-                    _1838_recErased = _out452;
-                    _1839_recIdents = _out453;
-                    if (!(_1837_recOwned)) {
-                      _1836_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_1836_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".as_ref()"));
-                    }
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(_1836_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".unwrap()"));
-                    isOwned = _1837_recOwned;
-                    isErased = _1838_recErased;
-                    readIdents = _1839_recIdents;
-                  }
-                } else if (_source64.is_Trait) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1840___mcc_h489 = _source64.dtor_path;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1841_recursiveGen;
-                    bool _1842_recOwned;
-                    bool _1843_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1844_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out454;
-                    bool _out455;
-                    bool _out456;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out457;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out454, out _out455, out _out456, out _out457);
-                    _1841_recursiveGen = _out454;
-                    _1842_recOwned = _out455;
-                    _1843_recErased = _out456;
-                    _1844_recIdents = _out457;
-                    if (!(_1842_recOwned)) {
-                      _1841_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_1841_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".as_ref()"));
-                    }
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(_1841_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".unwrap()"));
-                    isOwned = _1842_recOwned;
-                    isErased = _1843_recErased;
-                    readIdents = _1844_recIdents;
-                  }
-                } else {
-                  DAST._IType _1845___mcc_h492 = _source64.dtor_Newtype_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1846_recursiveGen;
-                    bool _1847_recOwned;
-                    bool _1848_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1849_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out458;
-                    bool _out459;
-                    bool _out460;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out461;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out458, out _out459, out _out460, out _out461);
-                    _1846_recursiveGen = _out458;
-                    _1847_recOwned = _out459;
-                    _1848_recErased = _out460;
-                    _1849_recIdents = _out461;
-                    if (!(_1847_recOwned)) {
-                      _1846_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_1846_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".as_ref()"));
-                    }
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(_1846_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".unwrap()"));
-                    isOwned = _1847_recOwned;
-                    isErased = _1848_recErased;
-                    readIdents = _1849_recIdents;
-                  }
-                }
-              } else if (_source63.is_Nullable) {
-                DAST._IType _1850___mcc_h495 = _source63.dtor_Nullable_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1851_recursiveGen;
-                  bool _1852_recOwned;
-                  bool _1853_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1854_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out462;
-                  bool _out463;
-                  bool _out464;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out465;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out462, out _out463, out _out464, out _out465);
-                  _1851_recursiveGen = _out462;
-                  _1852_recOwned = _out463;
-                  _1853_recErased = _out464;
-                  _1854_recIdents = _out465;
-                  if (!(_1852_recOwned)) {
-                    _1851_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_1851_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".as_ref()"));
-                  }
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(_1851_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".unwrap()"));
-                  isOwned = _1852_recOwned;
-                  isErased = _1853_recErased;
-                  readIdents = _1854_recIdents;
-                }
-              } else if (_source63.is_Tuple) {
-                Dafny.ISequence<DAST._IType> _1855___mcc_h498 = _source63.dtor_Tuple_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1856_recursiveGen;
-                  bool _1857_recOwned;
-                  bool _1858_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1859_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out466;
-                  bool _out467;
-                  bool _out468;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out469;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out466, out _out467, out _out468, out _out469);
-                  _1856_recursiveGen = _out466;
-                  _1857_recOwned = _out467;
-                  _1858_recErased = _out468;
-                  _1859_recIdents = _out469;
-                  if (!(_1857_recOwned)) {
-                    _1856_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_1856_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".as_ref()"));
-                  }
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(_1856_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".unwrap()"));
-                  isOwned = _1857_recOwned;
-                  isErased = _1858_recErased;
-                  readIdents = _1859_recIdents;
-                }
-              } else if (_source63.is_Array) {
-                DAST._IType _1860___mcc_h501 = _source63.dtor_element;
-                BigInteger _1861___mcc_h502 = _source63.dtor_dims;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1862_recursiveGen;
-                  bool _1863_recOwned;
-                  bool _1864_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1865_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out470;
-                  bool _out471;
-                  bool _out472;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out473;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out470, out _out471, out _out472, out _out473);
-                  _1862_recursiveGen = _out470;
-                  _1863_recOwned = _out471;
-                  _1864_recErased = _out472;
-                  _1865_recIdents = _out473;
-                  if (!(_1863_recOwned)) {
-                    _1862_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_1862_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".as_ref()"));
-                  }
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(_1862_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".unwrap()"));
-                  isOwned = _1863_recOwned;
-                  isErased = _1864_recErased;
-                  readIdents = _1865_recIdents;
-                }
-              } else if (_source63.is_Seq) {
-                DAST._IType _1866___mcc_h507 = _source63.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1867_recursiveGen;
-                  bool _1868_recOwned;
-                  bool _1869_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1870_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out474;
-                  bool _out475;
-                  bool _out476;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out477;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out474, out _out475, out _out476, out _out477);
-                  _1867_recursiveGen = _out474;
-                  _1868_recOwned = _out475;
-                  _1869_recErased = _out476;
-                  _1870_recIdents = _out477;
-                  if (!(_1868_recOwned)) {
-                    _1867_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_1867_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".as_ref()"));
-                  }
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(_1867_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".unwrap()"));
-                  isOwned = _1868_recOwned;
-                  isErased = _1869_recErased;
-                  readIdents = _1870_recIdents;
-                }
-              } else if (_source63.is_Set) {
-                DAST._IType _1871___mcc_h510 = _source63.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1872_recursiveGen;
-                  bool _1873_recOwned;
-                  bool _1874_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1875_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out478;
-                  bool _out479;
-                  bool _out480;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out481;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out478, out _out479, out _out480, out _out481);
-                  _1872_recursiveGen = _out478;
-                  _1873_recOwned = _out479;
-                  _1874_recErased = _out480;
-                  _1875_recIdents = _out481;
-                  if (!(_1873_recOwned)) {
-                    _1872_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_1872_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".as_ref()"));
-                  }
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(_1872_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".unwrap()"));
-                  isOwned = _1873_recOwned;
-                  isErased = _1874_recErased;
-                  readIdents = _1875_recIdents;
-                }
-              } else if (_source63.is_Multiset) {
-                DAST._IType _1876___mcc_h513 = _source63.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1877_recursiveGen;
-                  bool _1878_recOwned;
-                  bool _1879_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1880_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out482;
-                  bool _out483;
-                  bool _out484;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out485;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out482, out _out483, out _out484, out _out485);
-                  _1877_recursiveGen = _out482;
-                  _1878_recOwned = _out483;
-                  _1879_recErased = _out484;
-                  _1880_recIdents = _out485;
-                  if (!(_1878_recOwned)) {
-                    _1877_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_1877_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".as_ref()"));
-                  }
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(_1877_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".unwrap()"));
-                  isOwned = _1878_recOwned;
-                  isErased = _1879_recErased;
-                  readIdents = _1880_recIdents;
-                }
-              } else if (_source63.is_Map) {
-                DAST._IType _1881___mcc_h516 = _source63.dtor_key;
-                DAST._IType _1882___mcc_h517 = _source63.dtor_value;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1883_recursiveGen;
-                  bool _1884_recOwned;
-                  bool _1885_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1886_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out486;
-                  bool _out487;
-                  bool _out488;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out489;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out486, out _out487, out _out488, out _out489);
-                  _1883_recursiveGen = _out486;
-                  _1884_recOwned = _out487;
-                  _1885_recErased = _out488;
-                  _1886_recIdents = _out489;
-                  if (!(_1884_recOwned)) {
-                    _1883_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_1883_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".as_ref()"));
-                  }
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(_1883_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".unwrap()"));
-                  isOwned = _1884_recOwned;
-                  isErased = _1885_recErased;
-                  readIdents = _1886_recIdents;
-                }
-              } else if (_source63.is_Arrow) {
-                Dafny.ISequence<DAST._IType> _1887___mcc_h522 = _source63.dtor_args;
-                DAST._IType _1888___mcc_h523 = _source63.dtor_result;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1889_recursiveGen;
-                  bool _1890_recOwned;
-                  bool _1891_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1892_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out490;
-                  bool _out491;
-                  bool _out492;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out493;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out490, out _out491, out _out492, out _out493);
-                  _1889_recursiveGen = _out490;
-                  _1890_recOwned = _out491;
-                  _1891_recErased = _out492;
-                  _1892_recIdents = _out493;
-                  if (!(_1890_recOwned)) {
-                    _1889_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_1889_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".as_ref()"));
-                  }
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(_1889_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".unwrap()"));
-                  isOwned = _1890_recOwned;
-                  isErased = _1891_recErased;
-                  readIdents = _1892_recIdents;
-                }
-              } else if (_source63.is_Primitive) {
-                DAST._IPrimitive _1893___mcc_h528 = _source63.dtor_Primitive_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1894_recursiveGen;
-                  bool _1895_recOwned;
-                  bool _1896_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1897_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out494;
-                  bool _out495;
-                  bool _out496;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out497;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out494, out _out495, out _out496, out _out497);
-                  _1894_recursiveGen = _out494;
-                  _1895_recOwned = _out495;
-                  _1896_recErased = _out496;
-                  _1897_recIdents = _out497;
-                  if (!(_1895_recOwned)) {
-                    _1894_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_1894_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".as_ref()"));
-                  }
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(_1894_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".unwrap()"));
-                  isOwned = _1895_recOwned;
-                  isErased = _1896_recErased;
-                  readIdents = _1897_recIdents;
-                }
-              } else if (_source63.is_Passthrough) {
-                Dafny.ISequence<Dafny.Rune> _1898___mcc_h531 = _source63.dtor_Passthrough_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1899_recursiveGen;
-                  bool _1900_recOwned;
-                  bool _1901_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1902_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out498;
-                  bool _out499;
-                  bool _out500;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out501;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out498, out _out499, out _out500, out _out501);
-                  _1899_recursiveGen = _out498;
-                  _1900_recOwned = _out499;
-                  _1901_recErased = _out500;
-                  _1902_recIdents = _out501;
-                  if (!(_1900_recOwned)) {
-                    _1899_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_1899_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".as_ref()"));
-                  }
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(_1899_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".unwrap()"));
-                  isOwned = _1900_recOwned;
-                  isErased = _1901_recErased;
-                  readIdents = _1902_recIdents;
-                }
-              } else {
-                Dafny.ISequence<Dafny.Rune> _1903___mcc_h534 = _source63.dtor_TypeArg_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1904_recursiveGen;
-                  bool _1905_recOwned;
-                  bool _1906_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1907_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out502;
-                  bool _out503;
-                  bool _out504;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out505;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out502, out _out503, out _out504, out _out505);
-                  _1904_recursiveGen = _out502;
-                  _1905_recOwned = _out503;
-                  _1906_recErased = _out504;
-                  _1907_recIdents = _out505;
-                  if (!(_1905_recOwned)) {
-                    _1904_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_1904_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".as_ref()"));
-                  }
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(_1904_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".unwrap()"));
-                  isOwned = _1905_recOwned;
-                  isErased = _1906_recErased;
-                  readIdents = _1907_recIdents;
-                }
-              }
-            } else if (_source55.is_Tuple) {
-              Dafny.ISequence<DAST._IType> _1908___mcc_h537 = _source55.dtor_Tuple_a0;
-              DAST._IType _source65 = _1563___mcc_h306;
-              if (_source65.is_Path) {
-                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1909___mcc_h541 = _source65.dtor_Path_a0;
-                Dafny.ISequence<DAST._IType> _1910___mcc_h542 = _source65.dtor_typeArgs;
-                DAST._IResolvedType _1911___mcc_h543 = _source65.dtor_resolved;
-                DAST._IResolvedType _source66 = _1911___mcc_h543;
-                if (_source66.is_Datatype) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1912___mcc_h547 = _source66.dtor_path;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1913_recursiveGen;
-                    bool _1914_recOwned;
-                    bool _1915_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1916_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out506;
-                    bool _out507;
-                    bool _out508;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out509;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out506, out _out507, out _out508, out _out509);
-                    _1913_recursiveGen = _out506;
-                    _1914_recOwned = _out507;
-                    _1915_recErased = _out508;
-                    _1916_recIdents = _out509;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1913_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _1914_recOwned;
-                    isErased = _1915_recErased;
-                    readIdents = _1916_recIdents;
-                  }
-                } else if (_source66.is_Trait) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1917___mcc_h549 = _source66.dtor_path;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1918_recursiveGen;
-                    bool _1919_recOwned;
-                    bool _1920_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1921_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out510;
-                    bool _out511;
-                    bool _out512;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out513;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out510, out _out511, out _out512, out _out513);
-                    _1918_recursiveGen = _out510;
-                    _1919_recOwned = _out511;
-                    _1920_recErased = _out512;
-                    _1921_recIdents = _out513;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1918_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _1919_recOwned;
-                    isErased = _1920_recErased;
-                    readIdents = _1921_recIdents;
-                  }
-                } else {
-                  DAST._IType _1922___mcc_h551 = _source66.dtor_Newtype_a0;
-                  DAST._IType _1923_b = _1922___mcc_h551;
-                  {
-                    if (object.Equals(_1556_fromTpe, _1923_b)) {
-                      Dafny.ISequence<Dafny.Rune> _1924_recursiveGen;
-                      bool _1925_recOwned;
-                      bool _1926_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1927_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out514;
-                      bool _out515;
-                      bool _out516;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out517;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out514, out _out515, out _out516, out _out517);
-                      _1924_recursiveGen = _out514;
-                      _1925_recOwned = _out515;
-                      _1926_recErased = _out516;
-                      _1927_recIdents = _out517;
-                      Dafny.ISequence<Dafny.Rune> _1928_rhsType;
-                      Dafny.ISequence<Dafny.Rune> _out518;
-                      _out518 = DCOMP.COMP.GenType(_1555_toTpe, true, false);
-                      _1928_rhsType = _out518;
-                      Dafny.ISequence<Dafny.Rune> _1929_uneraseFn;
-                      _1929_uneraseFn = ((_1925_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase")));
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _1928_rhsType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ::dafny_runtime::DafnyUnerasable<_>>::")), _1929_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _1924_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                      isOwned = _1925_recOwned;
-                      isErased = false;
-                      readIdents = _1927_recIdents;
-                    } else {
-                      Dafny.ISequence<Dafny.Rune> _out519;
-                      bool _out520;
-                      bool _out521;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out522;
-                      DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _1923_b), _1923_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out519, out _out520, out _out521, out _out522);
-                      s = _out519;
-                      isOwned = _out520;
-                      isErased = _out521;
-                      readIdents = _out522;
-                    }
-                  }
-                }
-              } else if (_source65.is_Nullable) {
-                DAST._IType _1930___mcc_h553 = _source65.dtor_Nullable_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1931_recursiveGen;
-                  bool _1932_recOwned;
-                  bool _1933_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1934_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out523;
-                  bool _out524;
-                  bool _out525;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out526;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out523, out _out524, out _out525, out _out526);
-                  _1931_recursiveGen = _out523;
-                  _1932_recOwned = _out524;
-                  _1933_recErased = _out525;
-                  _1934_recIdents = _out526;
-                  if (!(_1932_recOwned)) {
-                    _1931_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_1931_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".clone()"));
-                  }
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Some("), _1931_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                  isOwned = true;
-                  isErased = _1933_recErased;
-                  readIdents = _1934_recIdents;
-                }
-              } else if (_source65.is_Tuple) {
-                Dafny.ISequence<DAST._IType> _1935___mcc_h555 = _source65.dtor_Tuple_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1936_recursiveGen;
-                  bool _1937_recOwned;
-                  bool _1938_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1939_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out527;
-                  bool _out528;
-                  bool _out529;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out530;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out527, out _out528, out _out529, out _out530);
-                  _1936_recursiveGen = _out527;
-                  _1937_recOwned = _out528;
-                  _1938_recErased = _out529;
-                  _1939_recIdents = _out530;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1936_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _1937_recOwned;
-                  isErased = _1938_recErased;
-                  readIdents = _1939_recIdents;
-                }
-              } else if (_source65.is_Array) {
-                DAST._IType _1940___mcc_h557 = _source65.dtor_element;
-                BigInteger _1941___mcc_h558 = _source65.dtor_dims;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1942_recursiveGen;
-                  bool _1943_recOwned;
-                  bool _1944_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1945_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out531;
-                  bool _out532;
-                  bool _out533;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out534;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out531, out _out532, out _out533, out _out534);
-                  _1942_recursiveGen = _out531;
-                  _1943_recOwned = _out532;
-                  _1944_recErased = _out533;
-                  _1945_recIdents = _out534;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1942_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _1943_recOwned;
-                  isErased = _1944_recErased;
-                  readIdents = _1945_recIdents;
-                }
-              } else if (_source65.is_Seq) {
-                DAST._IType _1946___mcc_h561 = _source65.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1947_recursiveGen;
-                  bool _1948_recOwned;
-                  bool _1949_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1950_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out535;
-                  bool _out536;
-                  bool _out537;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out538;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out535, out _out536, out _out537, out _out538);
-                  _1947_recursiveGen = _out535;
-                  _1948_recOwned = _out536;
-                  _1949_recErased = _out537;
-                  _1950_recIdents = _out538;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1947_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _1948_recOwned;
-                  isErased = _1949_recErased;
-                  readIdents = _1950_recIdents;
-                }
-              } else if (_source65.is_Set) {
-                DAST._IType _1951___mcc_h563 = _source65.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1952_recursiveGen;
-                  bool _1953_recOwned;
-                  bool _1954_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1955_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out539;
-                  bool _out540;
-                  bool _out541;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out542;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out539, out _out540, out _out541, out _out542);
-                  _1952_recursiveGen = _out539;
-                  _1953_recOwned = _out540;
-                  _1954_recErased = _out541;
-                  _1955_recIdents = _out542;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1952_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _1953_recOwned;
-                  isErased = _1954_recErased;
-                  readIdents = _1955_recIdents;
-                }
-              } else if (_source65.is_Multiset) {
-                DAST._IType _1956___mcc_h565 = _source65.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1957_recursiveGen;
-                  bool _1958_recOwned;
-                  bool _1959_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1960_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out543;
-                  bool _out544;
-                  bool _out545;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out546;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out543, out _out544, out _out545, out _out546);
-                  _1957_recursiveGen = _out543;
-                  _1958_recOwned = _out544;
-                  _1959_recErased = _out545;
-                  _1960_recIdents = _out546;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1957_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _1958_recOwned;
-                  isErased = _1959_recErased;
-                  readIdents = _1960_recIdents;
-                }
-              } else if (_source65.is_Map) {
-                DAST._IType _1961___mcc_h567 = _source65.dtor_key;
-                DAST._IType _1962___mcc_h568 = _source65.dtor_value;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1963_recursiveGen;
-                  bool _1964_recOwned;
-                  bool _1965_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1966_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out547;
-                  bool _out548;
-                  bool _out549;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out550;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out547, out _out548, out _out549, out _out550);
-                  _1963_recursiveGen = _out547;
-                  _1964_recOwned = _out548;
-                  _1965_recErased = _out549;
-                  _1966_recIdents = _out550;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1963_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _1964_recOwned;
-                  isErased = _1965_recErased;
-                  readIdents = _1966_recIdents;
-                }
-              } else if (_source65.is_Arrow) {
-                Dafny.ISequence<DAST._IType> _1967___mcc_h571 = _source65.dtor_args;
-                DAST._IType _1968___mcc_h572 = _source65.dtor_result;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1969_recursiveGen;
-                  bool _1970_recOwned;
-                  bool _1971_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1972_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out551;
-                  bool _out552;
-                  bool _out553;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out554;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out551, out _out552, out _out553, out _out554);
-                  _1969_recursiveGen = _out551;
-                  _1970_recOwned = _out552;
-                  _1971_recErased = _out553;
-                  _1972_recIdents = _out554;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1969_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _1970_recOwned;
-                  isErased = _1971_recErased;
-                  readIdents = _1972_recIdents;
-                }
-              } else if (_source65.is_Primitive) {
-                DAST._IPrimitive _1973___mcc_h575 = _source65.dtor_Primitive_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1974_recursiveGen;
-                  bool _1975_recOwned;
-                  bool _1976_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1977_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out555;
-                  bool _out556;
-                  bool _out557;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out558;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out555, out _out556, out _out557, out _out558);
-                  _1974_recursiveGen = _out555;
-                  _1975_recOwned = _out556;
-                  _1976_recErased = _out557;
-                  _1977_recIdents = _out558;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1974_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _1975_recOwned;
-                  isErased = _1976_recErased;
-                  readIdents = _1977_recIdents;
-                }
-              } else if (_source65.is_Passthrough) {
-                Dafny.ISequence<Dafny.Rune> _1978___mcc_h577 = _source65.dtor_Passthrough_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1979_recursiveGen;
-                  bool _1980_recOwned;
-                  bool _1981_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1982_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out559;
-                  bool _out560;
-                  bool _out561;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out562;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out559, out _out560, out _out561, out _out562);
-                  _1979_recursiveGen = _out559;
-                  _1980_recOwned = _out560;
-                  _1981_recErased = _out561;
-                  _1982_recIdents = _out562;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1979_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _1980_recOwned;
-                  isErased = _1981_recErased;
-                  readIdents = _1982_recIdents;
-                }
-              } else {
-                Dafny.ISequence<Dafny.Rune> _1983___mcc_h579 = _source65.dtor_TypeArg_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _1984_recursiveGen;
-                  bool _1985_recOwned;
-                  bool _1986_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1987_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out563;
-                  bool _out564;
-                  bool _out565;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out566;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out563, out _out564, out _out565, out _out566);
-                  _1984_recursiveGen = _out563;
-                  _1985_recOwned = _out564;
-                  _1986_recErased = _out565;
-                  _1987_recIdents = _out566;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1984_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _1985_recOwned;
-                  isErased = _1986_recErased;
-                  readIdents = _1987_recIdents;
-                }
-              }
-            } else if (_source55.is_Array) {
-              DAST._IType _1988___mcc_h581 = _source55.dtor_element;
-              BigInteger _1989___mcc_h582 = _source55.dtor_dims;
-              DAST._IType _source67 = _1563___mcc_h306;
-              if (_source67.is_Path) {
-                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1990___mcc_h589 = _source67.dtor_Path_a0;
-                Dafny.ISequence<DAST._IType> _1991___mcc_h590 = _source67.dtor_typeArgs;
-                DAST._IResolvedType _1992___mcc_h591 = _source67.dtor_resolved;
-                DAST._IResolvedType _source68 = _1992___mcc_h591;
-                if (_source68.is_Datatype) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1993___mcc_h595 = _source68.dtor_path;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1994_recursiveGen;
-                    bool _1995_recOwned;
-                    bool _1996_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1997_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out567;
-                    bool _out568;
-                    bool _out569;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out570;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out567, out _out568, out _out569, out _out570);
-                    _1994_recursiveGen = _out567;
-                    _1995_recOwned = _out568;
-                    _1996_recErased = _out569;
-                    _1997_recIdents = _out570;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1994_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _1995_recOwned;
-                    isErased = _1996_recErased;
-                    readIdents = _1997_recIdents;
-                  }
-                } else if (_source68.is_Trait) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1998___mcc_h597 = _source68.dtor_path;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _1999_recursiveGen;
-                    bool _2000_recOwned;
-                    bool _2001_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2002_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out571;
-                    bool _out572;
-                    bool _out573;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out574;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out571, out _out572, out _out573, out _out574);
-                    _1999_recursiveGen = _out571;
-                    _2000_recOwned = _out572;
-                    _2001_recErased = _out573;
-                    _2002_recIdents = _out574;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _1999_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2000_recOwned;
-                    isErased = _2001_recErased;
-                    readIdents = _2002_recIdents;
-                  }
-                } else {
-                  DAST._IType _2003___mcc_h599 = _source68.dtor_Newtype_a0;
-                  DAST._IType _2004_b = _2003___mcc_h599;
-                  {
-                    if (object.Equals(_1556_fromTpe, _2004_b)) {
-                      Dafny.ISequence<Dafny.Rune> _2005_recursiveGen;
-                      bool _2006_recOwned;
-                      bool _2007_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2008_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out575;
-                      bool _out576;
-                      bool _out577;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out578;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out575, out _out576, out _out577, out _out578);
-                      _2005_recursiveGen = _out575;
-                      _2006_recOwned = _out576;
-                      _2007_recErased = _out577;
-                      _2008_recIdents = _out578;
-                      Dafny.ISequence<Dafny.Rune> _2009_rhsType;
-                      Dafny.ISequence<Dafny.Rune> _out579;
-                      _out579 = DCOMP.COMP.GenType(_1555_toTpe, true, false);
-                      _2009_rhsType = _out579;
-                      Dafny.ISequence<Dafny.Rune> _2010_uneraseFn;
-                      _2010_uneraseFn = ((_2006_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase")));
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _2009_rhsType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ::dafny_runtime::DafnyUnerasable<_>>::")), _2010_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _2005_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                      isOwned = _2006_recOwned;
-                      isErased = false;
-                      readIdents = _2008_recIdents;
-                    } else {
-                      Dafny.ISequence<Dafny.Rune> _out580;
-                      bool _out581;
-                      bool _out582;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out583;
-                      DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _2004_b), _2004_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out580, out _out581, out _out582, out _out583);
-                      s = _out580;
-                      isOwned = _out581;
-                      isErased = _out582;
-                      readIdents = _out583;
-                    }
-                  }
-                }
-              } else if (_source67.is_Nullable) {
-                DAST._IType _2011___mcc_h601 = _source67.dtor_Nullable_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2012_recursiveGen;
-                  bool _2013_recOwned;
-                  bool _2014_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2015_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out584;
-                  bool _out585;
-                  bool _out586;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out587;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out584, out _out585, out _out586, out _out587);
-                  _2012_recursiveGen = _out584;
-                  _2013_recOwned = _out585;
-                  _2014_recErased = _out586;
-                  _2015_recIdents = _out587;
-                  if (!(_2013_recOwned)) {
-                    _2012_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_2012_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".clone()"));
-                  }
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Some("), _2012_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                  isOwned = true;
-                  isErased = _2014_recErased;
-                  readIdents = _2015_recIdents;
-                }
-              } else if (_source67.is_Tuple) {
-                Dafny.ISequence<DAST._IType> _2016___mcc_h603 = _source67.dtor_Tuple_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2017_recursiveGen;
-                  bool _2018_recOwned;
-                  bool _2019_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2020_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out588;
-                  bool _out589;
-                  bool _out590;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out591;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out588, out _out589, out _out590, out _out591);
-                  _2017_recursiveGen = _out588;
-                  _2018_recOwned = _out589;
-                  _2019_recErased = _out590;
-                  _2020_recIdents = _out591;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2017_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2018_recOwned;
-                  isErased = _2019_recErased;
-                  readIdents = _2020_recIdents;
-                }
-              } else if (_source67.is_Array) {
-                DAST._IType _2021___mcc_h605 = _source67.dtor_element;
-                BigInteger _2022___mcc_h606 = _source67.dtor_dims;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2023_recursiveGen;
-                  bool _2024_recOwned;
-                  bool _2025_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2026_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out592;
-                  bool _out593;
-                  bool _out594;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out595;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out592, out _out593, out _out594, out _out595);
-                  _2023_recursiveGen = _out592;
-                  _2024_recOwned = _out593;
-                  _2025_recErased = _out594;
-                  _2026_recIdents = _out595;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2023_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2024_recOwned;
-                  isErased = _2025_recErased;
-                  readIdents = _2026_recIdents;
-                }
-              } else if (_source67.is_Seq) {
-                DAST._IType _2027___mcc_h609 = _source67.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2028_recursiveGen;
-                  bool _2029_recOwned;
-                  bool _2030_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2031_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out596;
-                  bool _out597;
-                  bool _out598;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out599;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out596, out _out597, out _out598, out _out599);
-                  _2028_recursiveGen = _out596;
-                  _2029_recOwned = _out597;
-                  _2030_recErased = _out598;
-                  _2031_recIdents = _out599;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2028_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2029_recOwned;
-                  isErased = _2030_recErased;
-                  readIdents = _2031_recIdents;
-                }
-              } else if (_source67.is_Set) {
-                DAST._IType _2032___mcc_h611 = _source67.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2033_recursiveGen;
-                  bool _2034_recOwned;
-                  bool _2035_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2036_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out600;
-                  bool _out601;
-                  bool _out602;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out603;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out600, out _out601, out _out602, out _out603);
-                  _2033_recursiveGen = _out600;
-                  _2034_recOwned = _out601;
-                  _2035_recErased = _out602;
-                  _2036_recIdents = _out603;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2033_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2034_recOwned;
-                  isErased = _2035_recErased;
-                  readIdents = _2036_recIdents;
-                }
-              } else if (_source67.is_Multiset) {
-                DAST._IType _2037___mcc_h613 = _source67.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2038_recursiveGen;
-                  bool _2039_recOwned;
-                  bool _2040_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2041_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out604;
-                  bool _out605;
-                  bool _out606;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out607;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out604, out _out605, out _out606, out _out607);
-                  _2038_recursiveGen = _out604;
-                  _2039_recOwned = _out605;
-                  _2040_recErased = _out606;
-                  _2041_recIdents = _out607;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2038_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2039_recOwned;
-                  isErased = _2040_recErased;
-                  readIdents = _2041_recIdents;
-                }
-              } else if (_source67.is_Map) {
-                DAST._IType _2042___mcc_h615 = _source67.dtor_key;
-                DAST._IType _2043___mcc_h616 = _source67.dtor_value;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2044_recursiveGen;
-                  bool _2045_recOwned;
-                  bool _2046_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2047_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out608;
-                  bool _out609;
-                  bool _out610;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out611;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out608, out _out609, out _out610, out _out611);
-                  _2044_recursiveGen = _out608;
-                  _2045_recOwned = _out609;
-                  _2046_recErased = _out610;
-                  _2047_recIdents = _out611;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2044_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2045_recOwned;
-                  isErased = _2046_recErased;
-                  readIdents = _2047_recIdents;
-                }
-              } else if (_source67.is_Arrow) {
-                Dafny.ISequence<DAST._IType> _2048___mcc_h619 = _source67.dtor_args;
-                DAST._IType _2049___mcc_h620 = _source67.dtor_result;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2050_recursiveGen;
-                  bool _2051_recOwned;
-                  bool _2052_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2053_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out612;
-                  bool _out613;
-                  bool _out614;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out615;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out612, out _out613, out _out614, out _out615);
-                  _2050_recursiveGen = _out612;
-                  _2051_recOwned = _out613;
-                  _2052_recErased = _out614;
-                  _2053_recIdents = _out615;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2050_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2051_recOwned;
-                  isErased = _2052_recErased;
-                  readIdents = _2053_recIdents;
-                }
-              } else if (_source67.is_Primitive) {
-                DAST._IPrimitive _2054___mcc_h623 = _source67.dtor_Primitive_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2055_recursiveGen;
-                  bool _2056_recOwned;
-                  bool _2057_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2058_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out616;
-                  bool _out617;
-                  bool _out618;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out619;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out616, out _out617, out _out618, out _out619);
-                  _2055_recursiveGen = _out616;
-                  _2056_recOwned = _out617;
-                  _2057_recErased = _out618;
-                  _2058_recIdents = _out619;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2055_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2056_recOwned;
-                  isErased = _2057_recErased;
-                  readIdents = _2058_recIdents;
-                }
-              } else if (_source67.is_Passthrough) {
-                Dafny.ISequence<Dafny.Rune> _2059___mcc_h625 = _source67.dtor_Passthrough_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2060_recursiveGen;
-                  bool _2061_recOwned;
-                  bool _2062_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2063_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out620;
-                  bool _out621;
-                  bool _out622;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out623;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out620, out _out621, out _out622, out _out623);
-                  _2060_recursiveGen = _out620;
-                  _2061_recOwned = _out621;
-                  _2062_recErased = _out622;
-                  _2063_recIdents = _out623;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2060_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2061_recOwned;
-                  isErased = _2062_recErased;
-                  readIdents = _2063_recIdents;
-                }
-              } else {
-                Dafny.ISequence<Dafny.Rune> _2064___mcc_h627 = _source67.dtor_TypeArg_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2065_recursiveGen;
-                  bool _2066_recOwned;
-                  bool _2067_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2068_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out624;
-                  bool _out625;
-                  bool _out626;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out627;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out624, out _out625, out _out626, out _out627);
-                  _2065_recursiveGen = _out624;
-                  _2066_recOwned = _out625;
-                  _2067_recErased = _out626;
-                  _2068_recIdents = _out627;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2065_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2066_recOwned;
-                  isErased = _2067_recErased;
-                  readIdents = _2068_recIdents;
-                }
-              }
-            } else if (_source55.is_Seq) {
-              DAST._IType _2069___mcc_h629 = _source55.dtor_element;
-              DAST._IType _source69 = _1563___mcc_h306;
-              if (_source69.is_Path) {
-                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2070___mcc_h633 = _source69.dtor_Path_a0;
-                Dafny.ISequence<DAST._IType> _2071___mcc_h634 = _source69.dtor_typeArgs;
-                DAST._IResolvedType _2072___mcc_h635 = _source69.dtor_resolved;
-                DAST._IResolvedType _source70 = _2072___mcc_h635;
-                if (_source70.is_Datatype) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2073___mcc_h639 = _source70.dtor_path;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2074_recursiveGen;
-                    bool _2075_recOwned;
-                    bool _2076_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2077_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out628;
-                    bool _out629;
-                    bool _out630;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out631;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out628, out _out629, out _out630, out _out631);
-                    _2074_recursiveGen = _out628;
-                    _2075_recOwned = _out629;
-                    _2076_recErased = _out630;
-                    _2077_recIdents = _out631;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2074_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2075_recOwned;
-                    isErased = _2076_recErased;
-                    readIdents = _2077_recIdents;
-                  }
-                } else if (_source70.is_Trait) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2078___mcc_h641 = _source70.dtor_path;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2079_recursiveGen;
-                    bool _2080_recOwned;
-                    bool _2081_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2082_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out632;
-                    bool _out633;
-                    bool _out634;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out635;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out632, out _out633, out _out634, out _out635);
-                    _2079_recursiveGen = _out632;
-                    _2080_recOwned = _out633;
-                    _2081_recErased = _out634;
-                    _2082_recIdents = _out635;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2079_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2080_recOwned;
-                    isErased = _2081_recErased;
-                    readIdents = _2082_recIdents;
-                  }
-                } else {
-                  DAST._IType _2083___mcc_h643 = _source70.dtor_Newtype_a0;
-                  DAST._IType _2084_b = _2083___mcc_h643;
-                  {
-                    if (object.Equals(_1556_fromTpe, _2084_b)) {
-                      Dafny.ISequence<Dafny.Rune> _2085_recursiveGen;
-                      bool _2086_recOwned;
-                      bool _2087_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2088_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out636;
-                      bool _out637;
-                      bool _out638;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out639;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out636, out _out637, out _out638, out _out639);
-                      _2085_recursiveGen = _out636;
-                      _2086_recOwned = _out637;
-                      _2087_recErased = _out638;
-                      _2088_recIdents = _out639;
-                      Dafny.ISequence<Dafny.Rune> _2089_rhsType;
-                      Dafny.ISequence<Dafny.Rune> _out640;
-                      _out640 = DCOMP.COMP.GenType(_1555_toTpe, true, false);
-                      _2089_rhsType = _out640;
-                      Dafny.ISequence<Dafny.Rune> _2090_uneraseFn;
-                      _2090_uneraseFn = ((_2086_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase")));
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _2089_rhsType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ::dafny_runtime::DafnyUnerasable<_>>::")), _2090_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _2085_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                      isOwned = _2086_recOwned;
-                      isErased = false;
-                      readIdents = _2088_recIdents;
-                    } else {
-                      Dafny.ISequence<Dafny.Rune> _out641;
-                      bool _out642;
-                      bool _out643;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out644;
-                      DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _2084_b), _2084_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out641, out _out642, out _out643, out _out644);
-                      s = _out641;
-                      isOwned = _out642;
-                      isErased = _out643;
-                      readIdents = _out644;
-                    }
-                  }
-                }
-              } else if (_source69.is_Nullable) {
-                DAST._IType _2091___mcc_h645 = _source69.dtor_Nullable_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2092_recursiveGen;
-                  bool _2093_recOwned;
-                  bool _2094_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2095_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out645;
-                  bool _out646;
-                  bool _out647;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out648;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out645, out _out646, out _out647, out _out648);
-                  _2092_recursiveGen = _out645;
-                  _2093_recOwned = _out646;
-                  _2094_recErased = _out647;
-                  _2095_recIdents = _out648;
-                  if (!(_2093_recOwned)) {
-                    _2092_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_2092_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".clone()"));
-                  }
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Some("), _2092_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                  isOwned = true;
-                  isErased = _2094_recErased;
-                  readIdents = _2095_recIdents;
-                }
-              } else if (_source69.is_Tuple) {
-                Dafny.ISequence<DAST._IType> _2096___mcc_h647 = _source69.dtor_Tuple_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2097_recursiveGen;
-                  bool _2098_recOwned;
-                  bool _2099_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2100_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out649;
-                  bool _out650;
-                  bool _out651;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out652;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out649, out _out650, out _out651, out _out652);
-                  _2097_recursiveGen = _out649;
-                  _2098_recOwned = _out650;
-                  _2099_recErased = _out651;
-                  _2100_recIdents = _out652;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2097_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2098_recOwned;
-                  isErased = _2099_recErased;
-                  readIdents = _2100_recIdents;
-                }
-              } else if (_source69.is_Array) {
-                DAST._IType _2101___mcc_h649 = _source69.dtor_element;
-                BigInteger _2102___mcc_h650 = _source69.dtor_dims;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2103_recursiveGen;
-                  bool _2104_recOwned;
-                  bool _2105_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2106_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out653;
-                  bool _out654;
-                  bool _out655;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out656;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out653, out _out654, out _out655, out _out656);
-                  _2103_recursiveGen = _out653;
-                  _2104_recOwned = _out654;
-                  _2105_recErased = _out655;
-                  _2106_recIdents = _out656;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2103_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2104_recOwned;
-                  isErased = _2105_recErased;
-                  readIdents = _2106_recIdents;
-                }
-              } else if (_source69.is_Seq) {
-                DAST._IType _2107___mcc_h653 = _source69.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2108_recursiveGen;
-                  bool _2109_recOwned;
-                  bool _2110_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2111_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out657;
-                  bool _out658;
-                  bool _out659;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out660;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out657, out _out658, out _out659, out _out660);
-                  _2108_recursiveGen = _out657;
-                  _2109_recOwned = _out658;
-                  _2110_recErased = _out659;
-                  _2111_recIdents = _out660;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2108_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2109_recOwned;
-                  isErased = _2110_recErased;
-                  readIdents = _2111_recIdents;
-                }
-              } else if (_source69.is_Set) {
-                DAST._IType _2112___mcc_h655 = _source69.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2113_recursiveGen;
-                  bool _2114_recOwned;
-                  bool _2115_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2116_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out661;
-                  bool _out662;
-                  bool _out663;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out664;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out661, out _out662, out _out663, out _out664);
-                  _2113_recursiveGen = _out661;
-                  _2114_recOwned = _out662;
-                  _2115_recErased = _out663;
-                  _2116_recIdents = _out664;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2113_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2114_recOwned;
-                  isErased = _2115_recErased;
-                  readIdents = _2116_recIdents;
-                }
-              } else if (_source69.is_Multiset) {
-                DAST._IType _2117___mcc_h657 = _source69.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2118_recursiveGen;
-                  bool _2119_recOwned;
-                  bool _2120_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2121_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out665;
-                  bool _out666;
-                  bool _out667;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out668;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out665, out _out666, out _out667, out _out668);
-                  _2118_recursiveGen = _out665;
-                  _2119_recOwned = _out666;
-                  _2120_recErased = _out667;
-                  _2121_recIdents = _out668;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2118_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2119_recOwned;
-                  isErased = _2120_recErased;
-                  readIdents = _2121_recIdents;
-                }
-              } else if (_source69.is_Map) {
-                DAST._IType _2122___mcc_h659 = _source69.dtor_key;
-                DAST._IType _2123___mcc_h660 = _source69.dtor_value;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2124_recursiveGen;
-                  bool _2125_recOwned;
-                  bool _2126_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2127_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out669;
-                  bool _out670;
-                  bool _out671;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out672;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out669, out _out670, out _out671, out _out672);
-                  _2124_recursiveGen = _out669;
-                  _2125_recOwned = _out670;
-                  _2126_recErased = _out671;
-                  _2127_recIdents = _out672;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2124_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2125_recOwned;
-                  isErased = _2126_recErased;
-                  readIdents = _2127_recIdents;
-                }
-              } else if (_source69.is_Arrow) {
-                Dafny.ISequence<DAST._IType> _2128___mcc_h663 = _source69.dtor_args;
-                DAST._IType _2129___mcc_h664 = _source69.dtor_result;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2130_recursiveGen;
-                  bool _2131_recOwned;
-                  bool _2132_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2133_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out673;
-                  bool _out674;
-                  bool _out675;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out676;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out673, out _out674, out _out675, out _out676);
-                  _2130_recursiveGen = _out673;
-                  _2131_recOwned = _out674;
-                  _2132_recErased = _out675;
-                  _2133_recIdents = _out676;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2130_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2131_recOwned;
-                  isErased = _2132_recErased;
-                  readIdents = _2133_recIdents;
-                }
-              } else if (_source69.is_Primitive) {
-                DAST._IPrimitive _2134___mcc_h667 = _source69.dtor_Primitive_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2135_recursiveGen;
-                  bool _2136_recOwned;
-                  bool _2137_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2138_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out677;
-                  bool _out678;
-                  bool _out679;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out680;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out677, out _out678, out _out679, out _out680);
-                  _2135_recursiveGen = _out677;
-                  _2136_recOwned = _out678;
-                  _2137_recErased = _out679;
-                  _2138_recIdents = _out680;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2135_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2136_recOwned;
-                  isErased = _2137_recErased;
-                  readIdents = _2138_recIdents;
-                }
-              } else if (_source69.is_Passthrough) {
-                Dafny.ISequence<Dafny.Rune> _2139___mcc_h669 = _source69.dtor_Passthrough_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2140_recursiveGen;
-                  bool _2141_recOwned;
-                  bool _2142_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2143_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out681;
-                  bool _out682;
-                  bool _out683;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out684;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out681, out _out682, out _out683, out _out684);
-                  _2140_recursiveGen = _out681;
-                  _2141_recOwned = _out682;
-                  _2142_recErased = _out683;
-                  _2143_recIdents = _out684;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2140_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2141_recOwned;
-                  isErased = _2142_recErased;
-                  readIdents = _2143_recIdents;
-                }
-              } else {
-                Dafny.ISequence<Dafny.Rune> _2144___mcc_h671 = _source69.dtor_TypeArg_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2145_recursiveGen;
-                  bool _2146_recOwned;
-                  bool _2147_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2148_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out685;
-                  bool _out686;
-                  bool _out687;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out688;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out685, out _out686, out _out687, out _out688);
-                  _2145_recursiveGen = _out685;
-                  _2146_recOwned = _out686;
-                  _2147_recErased = _out687;
-                  _2148_recIdents = _out688;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2145_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2146_recOwned;
-                  isErased = _2147_recErased;
-                  readIdents = _2148_recIdents;
-                }
-              }
-            } else if (_source55.is_Set) {
-              DAST._IType _2149___mcc_h673 = _source55.dtor_element;
-              DAST._IType _source71 = _1563___mcc_h306;
-              if (_source71.is_Path) {
-                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2150___mcc_h677 = _source71.dtor_Path_a0;
-                Dafny.ISequence<DAST._IType> _2151___mcc_h678 = _source71.dtor_typeArgs;
-                DAST._IResolvedType _2152___mcc_h679 = _source71.dtor_resolved;
-                DAST._IResolvedType _source72 = _2152___mcc_h679;
-                if (_source72.is_Datatype) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2153___mcc_h683 = _source72.dtor_path;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2154_recursiveGen;
-                    bool _2155_recOwned;
-                    bool _2156_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2157_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out689;
-                    bool _out690;
-                    bool _out691;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out692;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out689, out _out690, out _out691, out _out692);
-                    _2154_recursiveGen = _out689;
-                    _2155_recOwned = _out690;
-                    _2156_recErased = _out691;
-                    _2157_recIdents = _out692;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2154_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2155_recOwned;
-                    isErased = _2156_recErased;
-                    readIdents = _2157_recIdents;
-                  }
-                } else if (_source72.is_Trait) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2158___mcc_h685 = _source72.dtor_path;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2159_recursiveGen;
-                    bool _2160_recOwned;
-                    bool _2161_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2162_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out693;
-                    bool _out694;
-                    bool _out695;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out696;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out693, out _out694, out _out695, out _out696);
-                    _2159_recursiveGen = _out693;
-                    _2160_recOwned = _out694;
-                    _2161_recErased = _out695;
-                    _2162_recIdents = _out696;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2159_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2160_recOwned;
-                    isErased = _2161_recErased;
-                    readIdents = _2162_recIdents;
-                  }
-                } else {
-                  DAST._IType _2163___mcc_h687 = _source72.dtor_Newtype_a0;
-                  DAST._IType _2164_b = _2163___mcc_h687;
-                  {
-                    if (object.Equals(_1556_fromTpe, _2164_b)) {
-                      Dafny.ISequence<Dafny.Rune> _2165_recursiveGen;
-                      bool _2166_recOwned;
-                      bool _2167_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2168_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out697;
-                      bool _out698;
-                      bool _out699;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out700;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out697, out _out698, out _out699, out _out700);
-                      _2165_recursiveGen = _out697;
-                      _2166_recOwned = _out698;
-                      _2167_recErased = _out699;
-                      _2168_recIdents = _out700;
-                      Dafny.ISequence<Dafny.Rune> _2169_rhsType;
-                      Dafny.ISequence<Dafny.Rune> _out701;
-                      _out701 = DCOMP.COMP.GenType(_1555_toTpe, true, false);
-                      _2169_rhsType = _out701;
-                      Dafny.ISequence<Dafny.Rune> _2170_uneraseFn;
-                      _2170_uneraseFn = ((_2166_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase")));
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _2169_rhsType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ::dafny_runtime::DafnyUnerasable<_>>::")), _2170_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _2165_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                      isOwned = _2166_recOwned;
-                      isErased = false;
-                      readIdents = _2168_recIdents;
-                    } else {
-                      Dafny.ISequence<Dafny.Rune> _out702;
-                      bool _out703;
-                      bool _out704;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out705;
-                      DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _2164_b), _2164_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out702, out _out703, out _out704, out _out705);
-                      s = _out702;
-                      isOwned = _out703;
-                      isErased = _out704;
-                      readIdents = _out705;
-                    }
-                  }
-                }
-              } else if (_source71.is_Nullable) {
-                DAST._IType _2171___mcc_h689 = _source71.dtor_Nullable_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2172_recursiveGen;
-                  bool _2173_recOwned;
-                  bool _2174_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2175_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out706;
-                  bool _out707;
-                  bool _out708;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out709;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out706, out _out707, out _out708, out _out709);
-                  _2172_recursiveGen = _out706;
-                  _2173_recOwned = _out707;
-                  _2174_recErased = _out708;
-                  _2175_recIdents = _out709;
-                  if (!(_2173_recOwned)) {
-                    _2172_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_2172_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".clone()"));
-                  }
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Some("), _2172_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                  isOwned = true;
-                  isErased = _2174_recErased;
-                  readIdents = _2175_recIdents;
-                }
-              } else if (_source71.is_Tuple) {
-                Dafny.ISequence<DAST._IType> _2176___mcc_h691 = _source71.dtor_Tuple_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2177_recursiveGen;
-                  bool _2178_recOwned;
-                  bool _2179_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2180_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out710;
-                  bool _out711;
-                  bool _out712;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out713;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out710, out _out711, out _out712, out _out713);
-                  _2177_recursiveGen = _out710;
-                  _2178_recOwned = _out711;
-                  _2179_recErased = _out712;
-                  _2180_recIdents = _out713;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2177_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2178_recOwned;
-                  isErased = _2179_recErased;
-                  readIdents = _2180_recIdents;
-                }
-              } else if (_source71.is_Array) {
-                DAST._IType _2181___mcc_h693 = _source71.dtor_element;
-                BigInteger _2182___mcc_h694 = _source71.dtor_dims;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2183_recursiveGen;
-                  bool _2184_recOwned;
-                  bool _2185_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2186_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out714;
-                  bool _out715;
-                  bool _out716;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out717;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out714, out _out715, out _out716, out _out717);
-                  _2183_recursiveGen = _out714;
-                  _2184_recOwned = _out715;
-                  _2185_recErased = _out716;
-                  _2186_recIdents = _out717;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2183_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2184_recOwned;
-                  isErased = _2185_recErased;
-                  readIdents = _2186_recIdents;
-                }
-              } else if (_source71.is_Seq) {
-                DAST._IType _2187___mcc_h697 = _source71.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2188_recursiveGen;
-                  bool _2189_recOwned;
-                  bool _2190_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2191_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out718;
-                  bool _out719;
-                  bool _out720;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out721;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out718, out _out719, out _out720, out _out721);
-                  _2188_recursiveGen = _out718;
-                  _2189_recOwned = _out719;
-                  _2190_recErased = _out720;
-                  _2191_recIdents = _out721;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2188_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2189_recOwned;
-                  isErased = _2190_recErased;
-                  readIdents = _2191_recIdents;
-                }
-              } else if (_source71.is_Set) {
-                DAST._IType _2192___mcc_h699 = _source71.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2193_recursiveGen;
-                  bool _2194_recOwned;
-                  bool _2195_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2196_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out722;
-                  bool _out723;
-                  bool _out724;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out725;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out722, out _out723, out _out724, out _out725);
-                  _2193_recursiveGen = _out722;
-                  _2194_recOwned = _out723;
-                  _2195_recErased = _out724;
-                  _2196_recIdents = _out725;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2193_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2194_recOwned;
-                  isErased = _2195_recErased;
-                  readIdents = _2196_recIdents;
-                }
-              } else if (_source71.is_Multiset) {
-                DAST._IType _2197___mcc_h701 = _source71.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2198_recursiveGen;
-                  bool _2199_recOwned;
-                  bool _2200_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2201_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out726;
-                  bool _out727;
-                  bool _out728;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out729;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out726, out _out727, out _out728, out _out729);
-                  _2198_recursiveGen = _out726;
-                  _2199_recOwned = _out727;
-                  _2200_recErased = _out728;
-                  _2201_recIdents = _out729;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2198_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2199_recOwned;
-                  isErased = _2200_recErased;
-                  readIdents = _2201_recIdents;
-                }
-              } else if (_source71.is_Map) {
-                DAST._IType _2202___mcc_h703 = _source71.dtor_key;
-                DAST._IType _2203___mcc_h704 = _source71.dtor_value;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2204_recursiveGen;
-                  bool _2205_recOwned;
-                  bool _2206_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2207_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out730;
-                  bool _out731;
-                  bool _out732;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out733;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out730, out _out731, out _out732, out _out733);
-                  _2204_recursiveGen = _out730;
-                  _2205_recOwned = _out731;
-                  _2206_recErased = _out732;
-                  _2207_recIdents = _out733;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2204_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2205_recOwned;
-                  isErased = _2206_recErased;
-                  readIdents = _2207_recIdents;
-                }
-              } else if (_source71.is_Arrow) {
-                Dafny.ISequence<DAST._IType> _2208___mcc_h707 = _source71.dtor_args;
-                DAST._IType _2209___mcc_h708 = _source71.dtor_result;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2210_recursiveGen;
-                  bool _2211_recOwned;
-                  bool _2212_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2213_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out734;
-                  bool _out735;
-                  bool _out736;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out737;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out734, out _out735, out _out736, out _out737);
-                  _2210_recursiveGen = _out734;
-                  _2211_recOwned = _out735;
-                  _2212_recErased = _out736;
-                  _2213_recIdents = _out737;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2210_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2211_recOwned;
-                  isErased = _2212_recErased;
-                  readIdents = _2213_recIdents;
-                }
-              } else if (_source71.is_Primitive) {
-                DAST._IPrimitive _2214___mcc_h711 = _source71.dtor_Primitive_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2215_recursiveGen;
-                  bool _2216_recOwned;
-                  bool _2217_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2218_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out738;
-                  bool _out739;
-                  bool _out740;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out741;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out738, out _out739, out _out740, out _out741);
-                  _2215_recursiveGen = _out738;
-                  _2216_recOwned = _out739;
-                  _2217_recErased = _out740;
-                  _2218_recIdents = _out741;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2215_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2216_recOwned;
-                  isErased = _2217_recErased;
-                  readIdents = _2218_recIdents;
-                }
-              } else if (_source71.is_Passthrough) {
-                Dafny.ISequence<Dafny.Rune> _2219___mcc_h713 = _source71.dtor_Passthrough_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2220_recursiveGen;
-                  bool _2221_recOwned;
-                  bool _2222_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2223_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out742;
-                  bool _out743;
-                  bool _out744;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out745;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out742, out _out743, out _out744, out _out745);
-                  _2220_recursiveGen = _out742;
-                  _2221_recOwned = _out743;
-                  _2222_recErased = _out744;
-                  _2223_recIdents = _out745;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2220_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2221_recOwned;
-                  isErased = _2222_recErased;
-                  readIdents = _2223_recIdents;
-                }
-              } else {
-                Dafny.ISequence<Dafny.Rune> _2224___mcc_h715 = _source71.dtor_TypeArg_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2225_recursiveGen;
-                  bool _2226_recOwned;
-                  bool _2227_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2228_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out746;
-                  bool _out747;
-                  bool _out748;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out749;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out746, out _out747, out _out748, out _out749);
-                  _2225_recursiveGen = _out746;
-                  _2226_recOwned = _out747;
-                  _2227_recErased = _out748;
-                  _2228_recIdents = _out749;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2225_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2226_recOwned;
-                  isErased = _2227_recErased;
-                  readIdents = _2228_recIdents;
-                }
-              }
-            } else if (_source55.is_Multiset) {
-              DAST._IType _2229___mcc_h717 = _source55.dtor_element;
-              DAST._IType _source73 = _1563___mcc_h306;
-              if (_source73.is_Path) {
-                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2230___mcc_h721 = _source73.dtor_Path_a0;
-                Dafny.ISequence<DAST._IType> _2231___mcc_h722 = _source73.dtor_typeArgs;
-                DAST._IResolvedType _2232___mcc_h723 = _source73.dtor_resolved;
-                DAST._IResolvedType _source74 = _2232___mcc_h723;
-                if (_source74.is_Datatype) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2233___mcc_h727 = _source74.dtor_path;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2234_recursiveGen;
-                    bool _2235_recOwned;
-                    bool _2236_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2237_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out750;
-                    bool _out751;
-                    bool _out752;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out753;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out750, out _out751, out _out752, out _out753);
-                    _2234_recursiveGen = _out750;
-                    _2235_recOwned = _out751;
-                    _2236_recErased = _out752;
-                    _2237_recIdents = _out753;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2234_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2235_recOwned;
-                    isErased = _2236_recErased;
-                    readIdents = _2237_recIdents;
-                  }
-                } else if (_source74.is_Trait) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2238___mcc_h729 = _source74.dtor_path;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2239_recursiveGen;
-                    bool _2240_recOwned;
-                    bool _2241_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2242_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out754;
-                    bool _out755;
-                    bool _out756;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out757;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out754, out _out755, out _out756, out _out757);
-                    _2239_recursiveGen = _out754;
-                    _2240_recOwned = _out755;
-                    _2241_recErased = _out756;
-                    _2242_recIdents = _out757;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2239_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2240_recOwned;
-                    isErased = _2241_recErased;
-                    readIdents = _2242_recIdents;
-                  }
-                } else {
-                  DAST._IType _2243___mcc_h731 = _source74.dtor_Newtype_a0;
-                  DAST._IType _2244_b = _2243___mcc_h731;
-                  {
-                    if (object.Equals(_1556_fromTpe, _2244_b)) {
-                      Dafny.ISequence<Dafny.Rune> _2245_recursiveGen;
-                      bool _2246_recOwned;
-                      bool _2247_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2248_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out758;
-                      bool _out759;
-                      bool _out760;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out761;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out758, out _out759, out _out760, out _out761);
-                      _2245_recursiveGen = _out758;
-                      _2246_recOwned = _out759;
-                      _2247_recErased = _out760;
-                      _2248_recIdents = _out761;
-                      Dafny.ISequence<Dafny.Rune> _2249_rhsType;
-                      Dafny.ISequence<Dafny.Rune> _out762;
-                      _out762 = DCOMP.COMP.GenType(_1555_toTpe, true, false);
-                      _2249_rhsType = _out762;
-                      Dafny.ISequence<Dafny.Rune> _2250_uneraseFn;
-                      _2250_uneraseFn = ((_2246_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase")));
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _2249_rhsType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ::dafny_runtime::DafnyUnerasable<_>>::")), _2250_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _2245_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                      isOwned = _2246_recOwned;
-                      isErased = false;
-                      readIdents = _2248_recIdents;
-                    } else {
-                      Dafny.ISequence<Dafny.Rune> _out763;
-                      bool _out764;
-                      bool _out765;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out766;
-                      DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _2244_b), _2244_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out763, out _out764, out _out765, out _out766);
-                      s = _out763;
-                      isOwned = _out764;
-                      isErased = _out765;
-                      readIdents = _out766;
-                    }
-                  }
-                }
-              } else if (_source73.is_Nullable) {
-                DAST._IType _2251___mcc_h733 = _source73.dtor_Nullable_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2252_recursiveGen;
-                  bool _2253_recOwned;
-                  bool _2254_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2255_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out767;
-                  bool _out768;
-                  bool _out769;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out770;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out767, out _out768, out _out769, out _out770);
-                  _2252_recursiveGen = _out767;
-                  _2253_recOwned = _out768;
-                  _2254_recErased = _out769;
-                  _2255_recIdents = _out770;
-                  if (!(_2253_recOwned)) {
-                    _2252_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_2252_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".clone()"));
-                  }
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Some("), _2252_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                  isOwned = true;
-                  isErased = _2254_recErased;
-                  readIdents = _2255_recIdents;
-                }
-              } else if (_source73.is_Tuple) {
-                Dafny.ISequence<DAST._IType> _2256___mcc_h735 = _source73.dtor_Tuple_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2257_recursiveGen;
-                  bool _2258_recOwned;
-                  bool _2259_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2260_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out771;
-                  bool _out772;
-                  bool _out773;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out774;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out771, out _out772, out _out773, out _out774);
-                  _2257_recursiveGen = _out771;
-                  _2258_recOwned = _out772;
-                  _2259_recErased = _out773;
-                  _2260_recIdents = _out774;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2257_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2258_recOwned;
-                  isErased = _2259_recErased;
-                  readIdents = _2260_recIdents;
-                }
-              } else if (_source73.is_Array) {
-                DAST._IType _2261___mcc_h737 = _source73.dtor_element;
-                BigInteger _2262___mcc_h738 = _source73.dtor_dims;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2263_recursiveGen;
-                  bool _2264_recOwned;
-                  bool _2265_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2266_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out775;
-                  bool _out776;
-                  bool _out777;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out778;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out775, out _out776, out _out777, out _out778);
-                  _2263_recursiveGen = _out775;
-                  _2264_recOwned = _out776;
-                  _2265_recErased = _out777;
-                  _2266_recIdents = _out778;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2263_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2264_recOwned;
-                  isErased = _2265_recErased;
-                  readIdents = _2266_recIdents;
-                }
-              } else if (_source73.is_Seq) {
-                DAST._IType _2267___mcc_h741 = _source73.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2268_recursiveGen;
-                  bool _2269_recOwned;
-                  bool _2270_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2271_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out779;
-                  bool _out780;
-                  bool _out781;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out782;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out779, out _out780, out _out781, out _out782);
-                  _2268_recursiveGen = _out779;
-                  _2269_recOwned = _out780;
-                  _2270_recErased = _out781;
-                  _2271_recIdents = _out782;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2268_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2269_recOwned;
-                  isErased = _2270_recErased;
-                  readIdents = _2271_recIdents;
-                }
-              } else if (_source73.is_Set) {
-                DAST._IType _2272___mcc_h743 = _source73.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2273_recursiveGen;
-                  bool _2274_recOwned;
-                  bool _2275_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2276_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out783;
-                  bool _out784;
-                  bool _out785;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out786;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out783, out _out784, out _out785, out _out786);
-                  _2273_recursiveGen = _out783;
-                  _2274_recOwned = _out784;
-                  _2275_recErased = _out785;
-                  _2276_recIdents = _out786;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2273_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2274_recOwned;
-                  isErased = _2275_recErased;
-                  readIdents = _2276_recIdents;
-                }
-              } else if (_source73.is_Multiset) {
-                DAST._IType _2277___mcc_h745 = _source73.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2278_recursiveGen;
-                  bool _2279_recOwned;
-                  bool _2280_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2281_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out787;
-                  bool _out788;
-                  bool _out789;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out790;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out787, out _out788, out _out789, out _out790);
-                  _2278_recursiveGen = _out787;
-                  _2279_recOwned = _out788;
-                  _2280_recErased = _out789;
-                  _2281_recIdents = _out790;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2278_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2279_recOwned;
-                  isErased = _2280_recErased;
-                  readIdents = _2281_recIdents;
-                }
-              } else if (_source73.is_Map) {
-                DAST._IType _2282___mcc_h747 = _source73.dtor_key;
-                DAST._IType _2283___mcc_h748 = _source73.dtor_value;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2284_recursiveGen;
-                  bool _2285_recOwned;
-                  bool _2286_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2287_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out791;
-                  bool _out792;
-                  bool _out793;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out794;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out791, out _out792, out _out793, out _out794);
-                  _2284_recursiveGen = _out791;
-                  _2285_recOwned = _out792;
-                  _2286_recErased = _out793;
-                  _2287_recIdents = _out794;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2284_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2285_recOwned;
-                  isErased = _2286_recErased;
-                  readIdents = _2287_recIdents;
-                }
-              } else if (_source73.is_Arrow) {
-                Dafny.ISequence<DAST._IType> _2288___mcc_h751 = _source73.dtor_args;
-                DAST._IType _2289___mcc_h752 = _source73.dtor_result;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2290_recursiveGen;
-                  bool _2291_recOwned;
-                  bool _2292_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2293_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out795;
-                  bool _out796;
-                  bool _out797;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out798;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out795, out _out796, out _out797, out _out798);
-                  _2290_recursiveGen = _out795;
-                  _2291_recOwned = _out796;
-                  _2292_recErased = _out797;
-                  _2293_recIdents = _out798;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2290_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2291_recOwned;
-                  isErased = _2292_recErased;
-                  readIdents = _2293_recIdents;
-                }
-              } else if (_source73.is_Primitive) {
-                DAST._IPrimitive _2294___mcc_h755 = _source73.dtor_Primitive_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2295_recursiveGen;
-                  bool _2296_recOwned;
-                  bool _2297_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2298_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out799;
-                  bool _out800;
-                  bool _out801;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out802;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out799, out _out800, out _out801, out _out802);
-                  _2295_recursiveGen = _out799;
-                  _2296_recOwned = _out800;
-                  _2297_recErased = _out801;
-                  _2298_recIdents = _out802;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2295_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2296_recOwned;
-                  isErased = _2297_recErased;
-                  readIdents = _2298_recIdents;
-                }
-              } else if (_source73.is_Passthrough) {
-                Dafny.ISequence<Dafny.Rune> _2299___mcc_h757 = _source73.dtor_Passthrough_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2300_recursiveGen;
-                  bool _2301_recOwned;
-                  bool _2302_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2303_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out803;
-                  bool _out804;
-                  bool _out805;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out806;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out803, out _out804, out _out805, out _out806);
-                  _2300_recursiveGen = _out803;
-                  _2301_recOwned = _out804;
-                  _2302_recErased = _out805;
-                  _2303_recIdents = _out806;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2300_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2301_recOwned;
-                  isErased = _2302_recErased;
-                  readIdents = _2303_recIdents;
-                }
-              } else {
-                Dafny.ISequence<Dafny.Rune> _2304___mcc_h759 = _source73.dtor_TypeArg_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2305_recursiveGen;
-                  bool _2306_recOwned;
-                  bool _2307_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2308_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out807;
-                  bool _out808;
-                  bool _out809;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out810;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out807, out _out808, out _out809, out _out810);
-                  _2305_recursiveGen = _out807;
-                  _2306_recOwned = _out808;
-                  _2307_recErased = _out809;
-                  _2308_recIdents = _out810;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2305_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2306_recOwned;
-                  isErased = _2307_recErased;
-                  readIdents = _2308_recIdents;
-                }
-              }
-            } else if (_source55.is_Map) {
-              DAST._IType _2309___mcc_h761 = _source55.dtor_key;
-              DAST._IType _2310___mcc_h762 = _source55.dtor_value;
-              DAST._IType _source75 = _1563___mcc_h306;
-              if (_source75.is_Path) {
-                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2311___mcc_h769 = _source75.dtor_Path_a0;
-                Dafny.ISequence<DAST._IType> _2312___mcc_h770 = _source75.dtor_typeArgs;
-                DAST._IResolvedType _2313___mcc_h771 = _source75.dtor_resolved;
-                DAST._IResolvedType _source76 = _2313___mcc_h771;
-                if (_source76.is_Datatype) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2314___mcc_h775 = _source76.dtor_path;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2315_recursiveGen;
-                    bool _2316_recOwned;
-                    bool _2317_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2318_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out811;
-                    bool _out812;
-                    bool _out813;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out814;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out811, out _out812, out _out813, out _out814);
-                    _2315_recursiveGen = _out811;
-                    _2316_recOwned = _out812;
-                    _2317_recErased = _out813;
-                    _2318_recIdents = _out814;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2315_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2316_recOwned;
-                    isErased = _2317_recErased;
-                    readIdents = _2318_recIdents;
-                  }
-                } else if (_source76.is_Trait) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2319___mcc_h777 = _source76.dtor_path;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2320_recursiveGen;
-                    bool _2321_recOwned;
-                    bool _2322_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2323_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out815;
-                    bool _out816;
-                    bool _out817;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out818;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out815, out _out816, out _out817, out _out818);
-                    _2320_recursiveGen = _out815;
-                    _2321_recOwned = _out816;
-                    _2322_recErased = _out817;
-                    _2323_recIdents = _out818;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2320_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2321_recOwned;
-                    isErased = _2322_recErased;
-                    readIdents = _2323_recIdents;
-                  }
-                } else {
-                  DAST._IType _2324___mcc_h779 = _source76.dtor_Newtype_a0;
-                  DAST._IType _2325_b = _2324___mcc_h779;
-                  {
-                    if (object.Equals(_1556_fromTpe, _2325_b)) {
-                      Dafny.ISequence<Dafny.Rune> _2326_recursiveGen;
-                      bool _2327_recOwned;
-                      bool _2328_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2329_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out819;
-                      bool _out820;
-                      bool _out821;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out822;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out819, out _out820, out _out821, out _out822);
-                      _2326_recursiveGen = _out819;
-                      _2327_recOwned = _out820;
-                      _2328_recErased = _out821;
-                      _2329_recIdents = _out822;
-                      Dafny.ISequence<Dafny.Rune> _2330_rhsType;
-                      Dafny.ISequence<Dafny.Rune> _out823;
-                      _out823 = DCOMP.COMP.GenType(_1555_toTpe, true, false);
-                      _2330_rhsType = _out823;
-                      Dafny.ISequence<Dafny.Rune> _2331_uneraseFn;
-                      _2331_uneraseFn = ((_2327_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase")));
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _2330_rhsType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ::dafny_runtime::DafnyUnerasable<_>>::")), _2331_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _2326_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                      isOwned = _2327_recOwned;
-                      isErased = false;
-                      readIdents = _2329_recIdents;
-                    } else {
-                      Dafny.ISequence<Dafny.Rune> _out824;
-                      bool _out825;
-                      bool _out826;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out827;
-                      DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _2325_b), _2325_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out824, out _out825, out _out826, out _out827);
-                      s = _out824;
-                      isOwned = _out825;
-                      isErased = _out826;
-                      readIdents = _out827;
-                    }
-                  }
-                }
-              } else if (_source75.is_Nullable) {
-                DAST._IType _2332___mcc_h781 = _source75.dtor_Nullable_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2333_recursiveGen;
-                  bool _2334_recOwned;
-                  bool _2335_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2336_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out828;
-                  bool _out829;
-                  bool _out830;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out831;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out828, out _out829, out _out830, out _out831);
-                  _2333_recursiveGen = _out828;
-                  _2334_recOwned = _out829;
-                  _2335_recErased = _out830;
-                  _2336_recIdents = _out831;
-                  if (!(_2334_recOwned)) {
-                    _2333_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_2333_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".clone()"));
-                  }
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Some("), _2333_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                  isOwned = true;
-                  isErased = _2335_recErased;
-                  readIdents = _2336_recIdents;
-                }
-              } else if (_source75.is_Tuple) {
-                Dafny.ISequence<DAST._IType> _2337___mcc_h783 = _source75.dtor_Tuple_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2338_recursiveGen;
-                  bool _2339_recOwned;
-                  bool _2340_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2341_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out832;
-                  bool _out833;
-                  bool _out834;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out835;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out832, out _out833, out _out834, out _out835);
-                  _2338_recursiveGen = _out832;
-                  _2339_recOwned = _out833;
-                  _2340_recErased = _out834;
-                  _2341_recIdents = _out835;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2338_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2339_recOwned;
-                  isErased = _2340_recErased;
-                  readIdents = _2341_recIdents;
-                }
-              } else if (_source75.is_Array) {
-                DAST._IType _2342___mcc_h785 = _source75.dtor_element;
-                BigInteger _2343___mcc_h786 = _source75.dtor_dims;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2344_recursiveGen;
-                  bool _2345_recOwned;
-                  bool _2346_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2347_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out836;
-                  bool _out837;
-                  bool _out838;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out839;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out836, out _out837, out _out838, out _out839);
-                  _2344_recursiveGen = _out836;
-                  _2345_recOwned = _out837;
-                  _2346_recErased = _out838;
-                  _2347_recIdents = _out839;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2344_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2345_recOwned;
-                  isErased = _2346_recErased;
-                  readIdents = _2347_recIdents;
-                }
-              } else if (_source75.is_Seq) {
-                DAST._IType _2348___mcc_h789 = _source75.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2349_recursiveGen;
-                  bool _2350_recOwned;
-                  bool _2351_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2352_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out840;
-                  bool _out841;
-                  bool _out842;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out843;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out840, out _out841, out _out842, out _out843);
-                  _2349_recursiveGen = _out840;
-                  _2350_recOwned = _out841;
-                  _2351_recErased = _out842;
-                  _2352_recIdents = _out843;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2349_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2350_recOwned;
-                  isErased = _2351_recErased;
-                  readIdents = _2352_recIdents;
-                }
-              } else if (_source75.is_Set) {
-                DAST._IType _2353___mcc_h791 = _source75.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2354_recursiveGen;
-                  bool _2355_recOwned;
-                  bool _2356_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2357_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out844;
-                  bool _out845;
-                  bool _out846;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out847;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out844, out _out845, out _out846, out _out847);
-                  _2354_recursiveGen = _out844;
-                  _2355_recOwned = _out845;
-                  _2356_recErased = _out846;
-                  _2357_recIdents = _out847;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2354_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2355_recOwned;
-                  isErased = _2356_recErased;
-                  readIdents = _2357_recIdents;
-                }
-              } else if (_source75.is_Multiset) {
-                DAST._IType _2358___mcc_h793 = _source75.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2359_recursiveGen;
-                  bool _2360_recOwned;
-                  bool _2361_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2362_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out848;
-                  bool _out849;
-                  bool _out850;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out851;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out848, out _out849, out _out850, out _out851);
-                  _2359_recursiveGen = _out848;
-                  _2360_recOwned = _out849;
-                  _2361_recErased = _out850;
-                  _2362_recIdents = _out851;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2359_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2360_recOwned;
-                  isErased = _2361_recErased;
-                  readIdents = _2362_recIdents;
-                }
-              } else if (_source75.is_Map) {
-                DAST._IType _2363___mcc_h795 = _source75.dtor_key;
-                DAST._IType _2364___mcc_h796 = _source75.dtor_value;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2365_recursiveGen;
-                  bool _2366_recOwned;
-                  bool _2367_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2368_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out852;
-                  bool _out853;
-                  bool _out854;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out855;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out852, out _out853, out _out854, out _out855);
-                  _2365_recursiveGen = _out852;
-                  _2366_recOwned = _out853;
-                  _2367_recErased = _out854;
-                  _2368_recIdents = _out855;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2365_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2366_recOwned;
-                  isErased = _2367_recErased;
-                  readIdents = _2368_recIdents;
-                }
-              } else if (_source75.is_Arrow) {
-                Dafny.ISequence<DAST._IType> _2369___mcc_h799 = _source75.dtor_args;
-                DAST._IType _2370___mcc_h800 = _source75.dtor_result;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2371_recursiveGen;
-                  bool _2372_recOwned;
-                  bool _2373_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2374_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out856;
-                  bool _out857;
-                  bool _out858;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out859;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out856, out _out857, out _out858, out _out859);
-                  _2371_recursiveGen = _out856;
-                  _2372_recOwned = _out857;
-                  _2373_recErased = _out858;
-                  _2374_recIdents = _out859;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2371_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2372_recOwned;
-                  isErased = _2373_recErased;
-                  readIdents = _2374_recIdents;
-                }
-              } else if (_source75.is_Primitive) {
-                DAST._IPrimitive _2375___mcc_h803 = _source75.dtor_Primitive_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2376_recursiveGen;
-                  bool _2377_recOwned;
-                  bool _2378_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2379_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out860;
-                  bool _out861;
-                  bool _out862;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out863;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out860, out _out861, out _out862, out _out863);
-                  _2376_recursiveGen = _out860;
-                  _2377_recOwned = _out861;
-                  _2378_recErased = _out862;
-                  _2379_recIdents = _out863;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2376_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2377_recOwned;
-                  isErased = _2378_recErased;
-                  readIdents = _2379_recIdents;
-                }
-              } else if (_source75.is_Passthrough) {
-                Dafny.ISequence<Dafny.Rune> _2380___mcc_h805 = _source75.dtor_Passthrough_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2381_recursiveGen;
-                  bool _2382_recOwned;
-                  bool _2383_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2384_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out864;
-                  bool _out865;
-                  bool _out866;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out867;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out864, out _out865, out _out866, out _out867);
-                  _2381_recursiveGen = _out864;
-                  _2382_recOwned = _out865;
-                  _2383_recErased = _out866;
-                  _2384_recIdents = _out867;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2381_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2382_recOwned;
-                  isErased = _2383_recErased;
-                  readIdents = _2384_recIdents;
-                }
-              } else {
-                Dafny.ISequence<Dafny.Rune> _2385___mcc_h807 = _source75.dtor_TypeArg_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2386_recursiveGen;
-                  bool _2387_recOwned;
-                  bool _2388_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2389_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out868;
-                  bool _out869;
-                  bool _out870;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out871;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out868, out _out869, out _out870, out _out871);
-                  _2386_recursiveGen = _out868;
-                  _2387_recOwned = _out869;
-                  _2388_recErased = _out870;
-                  _2389_recIdents = _out871;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2386_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2387_recOwned;
-                  isErased = _2388_recErased;
-                  readIdents = _2389_recIdents;
-                }
-              }
-            } else if (_source55.is_Arrow) {
-              Dafny.ISequence<DAST._IType> _2390___mcc_h809 = _source55.dtor_args;
-              DAST._IType _2391___mcc_h810 = _source55.dtor_result;
-              DAST._IType _source77 = _1563___mcc_h306;
-              if (_source77.is_Path) {
-                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2392___mcc_h817 = _source77.dtor_Path_a0;
-                Dafny.ISequence<DAST._IType> _2393___mcc_h818 = _source77.dtor_typeArgs;
-                DAST._IResolvedType _2394___mcc_h819 = _source77.dtor_resolved;
-                DAST._IResolvedType _source78 = _2394___mcc_h819;
-                if (_source78.is_Datatype) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2395___mcc_h823 = _source78.dtor_path;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2396_recursiveGen;
-                    bool _2397_recOwned;
-                    bool _2398_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2399_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out872;
-                    bool _out873;
-                    bool _out874;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out875;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out872, out _out873, out _out874, out _out875);
-                    _2396_recursiveGen = _out872;
-                    _2397_recOwned = _out873;
-                    _2398_recErased = _out874;
-                    _2399_recIdents = _out875;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2396_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2397_recOwned;
-                    isErased = _2398_recErased;
-                    readIdents = _2399_recIdents;
-                  }
-                } else if (_source78.is_Trait) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2400___mcc_h825 = _source78.dtor_path;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2401_recursiveGen;
-                    bool _2402_recOwned;
-                    bool _2403_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2404_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out876;
-                    bool _out877;
-                    bool _out878;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out879;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out876, out _out877, out _out878, out _out879);
-                    _2401_recursiveGen = _out876;
-                    _2402_recOwned = _out877;
-                    _2403_recErased = _out878;
-                    _2404_recIdents = _out879;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2401_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2402_recOwned;
-                    isErased = _2403_recErased;
-                    readIdents = _2404_recIdents;
-                  }
-                } else {
-                  DAST._IType _2405___mcc_h827 = _source78.dtor_Newtype_a0;
-                  DAST._IType _2406_b = _2405___mcc_h827;
-                  {
-                    if (object.Equals(_1556_fromTpe, _2406_b)) {
-                      Dafny.ISequence<Dafny.Rune> _2407_recursiveGen;
-                      bool _2408_recOwned;
-                      bool _2409_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2410_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out880;
-                      bool _out881;
-                      bool _out882;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out883;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out880, out _out881, out _out882, out _out883);
-                      _2407_recursiveGen = _out880;
-                      _2408_recOwned = _out881;
-                      _2409_recErased = _out882;
-                      _2410_recIdents = _out883;
-                      Dafny.ISequence<Dafny.Rune> _2411_rhsType;
-                      Dafny.ISequence<Dafny.Rune> _out884;
-                      _out884 = DCOMP.COMP.GenType(_1555_toTpe, true, false);
-                      _2411_rhsType = _out884;
-                      Dafny.ISequence<Dafny.Rune> _2412_uneraseFn;
-                      _2412_uneraseFn = ((_2408_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase")));
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _2411_rhsType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ::dafny_runtime::DafnyUnerasable<_>>::")), _2412_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _2407_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                      isOwned = _2408_recOwned;
-                      isErased = false;
-                      readIdents = _2410_recIdents;
-                    } else {
-                      Dafny.ISequence<Dafny.Rune> _out885;
-                      bool _out886;
-                      bool _out887;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out888;
-                      DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _2406_b), _2406_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out885, out _out886, out _out887, out _out888);
-                      s = _out885;
-                      isOwned = _out886;
-                      isErased = _out887;
-                      readIdents = _out888;
-                    }
-                  }
-                }
-              } else if (_source77.is_Nullable) {
-                DAST._IType _2413___mcc_h829 = _source77.dtor_Nullable_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2414_recursiveGen;
-                  bool _2415_recOwned;
-                  bool _2416_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2417_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out889;
-                  bool _out890;
-                  bool _out891;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out892;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out889, out _out890, out _out891, out _out892);
-                  _2414_recursiveGen = _out889;
-                  _2415_recOwned = _out890;
-                  _2416_recErased = _out891;
-                  _2417_recIdents = _out892;
-                  if (!(_2415_recOwned)) {
-                    _2414_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_2414_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".clone()"));
-                  }
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Some("), _2414_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                  isOwned = true;
-                  isErased = _2416_recErased;
-                  readIdents = _2417_recIdents;
-                }
-              } else if (_source77.is_Tuple) {
-                Dafny.ISequence<DAST._IType> _2418___mcc_h831 = _source77.dtor_Tuple_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2419_recursiveGen;
-                  bool _2420_recOwned;
-                  bool _2421_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2422_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out893;
-                  bool _out894;
-                  bool _out895;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out896;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out893, out _out894, out _out895, out _out896);
-                  _2419_recursiveGen = _out893;
-                  _2420_recOwned = _out894;
-                  _2421_recErased = _out895;
-                  _2422_recIdents = _out896;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2419_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2420_recOwned;
-                  isErased = _2421_recErased;
-                  readIdents = _2422_recIdents;
-                }
-              } else if (_source77.is_Array) {
-                DAST._IType _2423___mcc_h833 = _source77.dtor_element;
-                BigInteger _2424___mcc_h834 = _source77.dtor_dims;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2425_recursiveGen;
-                  bool _2426_recOwned;
-                  bool _2427_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2428_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out897;
-                  bool _out898;
-                  bool _out899;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out900;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out897, out _out898, out _out899, out _out900);
-                  _2425_recursiveGen = _out897;
-                  _2426_recOwned = _out898;
-                  _2427_recErased = _out899;
-                  _2428_recIdents = _out900;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2425_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2426_recOwned;
-                  isErased = _2427_recErased;
-                  readIdents = _2428_recIdents;
-                }
-              } else if (_source77.is_Seq) {
-                DAST._IType _2429___mcc_h837 = _source77.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2430_recursiveGen;
-                  bool _2431_recOwned;
-                  bool _2432_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2433_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out901;
-                  bool _out902;
-                  bool _out903;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out904;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out901, out _out902, out _out903, out _out904);
-                  _2430_recursiveGen = _out901;
-                  _2431_recOwned = _out902;
-                  _2432_recErased = _out903;
-                  _2433_recIdents = _out904;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2430_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2431_recOwned;
-                  isErased = _2432_recErased;
-                  readIdents = _2433_recIdents;
-                }
-              } else if (_source77.is_Set) {
-                DAST._IType _2434___mcc_h839 = _source77.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2435_recursiveGen;
-                  bool _2436_recOwned;
-                  bool _2437_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2438_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out905;
-                  bool _out906;
-                  bool _out907;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out908;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out905, out _out906, out _out907, out _out908);
-                  _2435_recursiveGen = _out905;
-                  _2436_recOwned = _out906;
-                  _2437_recErased = _out907;
-                  _2438_recIdents = _out908;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2435_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2436_recOwned;
-                  isErased = _2437_recErased;
-                  readIdents = _2438_recIdents;
-                }
-              } else if (_source77.is_Multiset) {
-                DAST._IType _2439___mcc_h841 = _source77.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2440_recursiveGen;
-                  bool _2441_recOwned;
-                  bool _2442_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2443_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out909;
-                  bool _out910;
-                  bool _out911;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out912;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out909, out _out910, out _out911, out _out912);
-                  _2440_recursiveGen = _out909;
-                  _2441_recOwned = _out910;
-                  _2442_recErased = _out911;
-                  _2443_recIdents = _out912;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2440_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2441_recOwned;
-                  isErased = _2442_recErased;
-                  readIdents = _2443_recIdents;
-                }
-              } else if (_source77.is_Map) {
-                DAST._IType _2444___mcc_h843 = _source77.dtor_key;
-                DAST._IType _2445___mcc_h844 = _source77.dtor_value;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2446_recursiveGen;
-                  bool _2447_recOwned;
-                  bool _2448_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2449_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out913;
-                  bool _out914;
-                  bool _out915;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out916;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out913, out _out914, out _out915, out _out916);
-                  _2446_recursiveGen = _out913;
-                  _2447_recOwned = _out914;
-                  _2448_recErased = _out915;
-                  _2449_recIdents = _out916;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2446_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2447_recOwned;
-                  isErased = _2448_recErased;
-                  readIdents = _2449_recIdents;
-                }
-              } else if (_source77.is_Arrow) {
-                Dafny.ISequence<DAST._IType> _2450___mcc_h847 = _source77.dtor_args;
-                DAST._IType _2451___mcc_h848 = _source77.dtor_result;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2452_recursiveGen;
-                  bool _2453_recOwned;
-                  bool _2454_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2455_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out917;
-                  bool _out918;
-                  bool _out919;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out920;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out917, out _out918, out _out919, out _out920);
-                  _2452_recursiveGen = _out917;
-                  _2453_recOwned = _out918;
-                  _2454_recErased = _out919;
-                  _2455_recIdents = _out920;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2452_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2453_recOwned;
-                  isErased = _2454_recErased;
-                  readIdents = _2455_recIdents;
-                }
-              } else if (_source77.is_Primitive) {
-                DAST._IPrimitive _2456___mcc_h851 = _source77.dtor_Primitive_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2457_recursiveGen;
-                  bool _2458_recOwned;
-                  bool _2459_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2460_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out921;
-                  bool _out922;
-                  bool _out923;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out924;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out921, out _out922, out _out923, out _out924);
-                  _2457_recursiveGen = _out921;
-                  _2458_recOwned = _out922;
-                  _2459_recErased = _out923;
-                  _2460_recIdents = _out924;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2457_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2458_recOwned;
-                  isErased = _2459_recErased;
-                  readIdents = _2460_recIdents;
-                }
-              } else if (_source77.is_Passthrough) {
-                Dafny.ISequence<Dafny.Rune> _2461___mcc_h853 = _source77.dtor_Passthrough_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2462_recursiveGen;
-                  bool _2463_recOwned;
-                  bool _2464_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2465_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out925;
-                  bool _out926;
-                  bool _out927;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out928;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out925, out _out926, out _out927, out _out928);
-                  _2462_recursiveGen = _out925;
-                  _2463_recOwned = _out926;
-                  _2464_recErased = _out927;
-                  _2465_recIdents = _out928;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2462_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2463_recOwned;
-                  isErased = _2464_recErased;
-                  readIdents = _2465_recIdents;
-                }
-              } else {
-                Dafny.ISequence<Dafny.Rune> _2466___mcc_h855 = _source77.dtor_TypeArg_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2467_recursiveGen;
-                  bool _2468_recOwned;
-                  bool _2469_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2470_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out929;
-                  bool _out930;
-                  bool _out931;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out932;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out929, out _out930, out _out931, out _out932);
-                  _2467_recursiveGen = _out929;
-                  _2468_recOwned = _out930;
-                  _2469_recErased = _out931;
-                  _2470_recIdents = _out932;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2467_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2468_recOwned;
-                  isErased = _2469_recErased;
-                  readIdents = _2470_recIdents;
-                }
-              }
-            } else if (_source55.is_Primitive) {
-              DAST._IPrimitive _2471___mcc_h857 = _source55.dtor_Primitive_a0;
-              DAST._IPrimitive _source79 = _2471___mcc_h857;
-              if (_source79.is_Int) {
-                DAST._IType _source80 = _1563___mcc_h306;
-                if (_source80.is_Path) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2472___mcc_h861 = _source80.dtor_Path_a0;
-                  Dafny.ISequence<DAST._IType> _2473___mcc_h862 = _source80.dtor_typeArgs;
-                  DAST._IResolvedType _2474___mcc_h863 = _source80.dtor_resolved;
-                  DAST._IResolvedType _source81 = _2474___mcc_h863;
-                  if (_source81.is_Datatype) {
-                    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2475___mcc_h867 = _source81.dtor_path;
-                    {
-                      Dafny.ISequence<Dafny.Rune> _2476_recursiveGen;
-                      bool _2477_recOwned;
-                      bool _2478_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2479_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out933;
-                      bool _out934;
-                      bool _out935;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out936;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out933, out _out934, out _out935, out _out936);
-                      _2476_recursiveGen = _out933;
-                      _2477_recOwned = _out934;
-                      _2478_recErased = _out935;
-                      _2479_recIdents = _out936;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2476_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                      isOwned = _2477_recOwned;
-                      isErased = _2478_recErased;
-                      readIdents = _2479_recIdents;
-                    }
-                  } else if (_source81.is_Trait) {
-                    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2480___mcc_h869 = _source81.dtor_path;
-                    {
-                      Dafny.ISequence<Dafny.Rune> _2481_recursiveGen;
-                      bool _2482_recOwned;
-                      bool _2483_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2484_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out937;
-                      bool _out938;
-                      bool _out939;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out940;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out937, out _out938, out _out939, out _out940);
-                      _2481_recursiveGen = _out937;
-                      _2482_recOwned = _out938;
-                      _2483_recErased = _out939;
-                      _2484_recIdents = _out940;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2481_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                      isOwned = _2482_recOwned;
-                      isErased = _2483_recErased;
-                      readIdents = _2484_recIdents;
-                    }
-                  } else {
-                    DAST._IType _2485___mcc_h871 = _source81.dtor_Newtype_a0;
-                    DAST._IType _2486_b = _2485___mcc_h871;
-                    {
-                      if (object.Equals(_1556_fromTpe, _2486_b)) {
-                        Dafny.ISequence<Dafny.Rune> _2487_recursiveGen;
-                        bool _2488_recOwned;
-                        bool _2489_recErased;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2490_recIdents;
-                        Dafny.ISequence<Dafny.Rune> _out941;
-                        bool _out942;
-                        bool _out943;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out944;
-                        DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out941, out _out942, out _out943, out _out944);
-                        _2487_recursiveGen = _out941;
-                        _2488_recOwned = _out942;
-                        _2489_recErased = _out943;
-                        _2490_recIdents = _out944;
-                        Dafny.ISequence<Dafny.Rune> _2491_rhsType;
-                        Dafny.ISequence<Dafny.Rune> _out945;
-                        _out945 = DCOMP.COMP.GenType(_1555_toTpe, true, false);
-                        _2491_rhsType = _out945;
-                        Dafny.ISequence<Dafny.Rune> _2492_uneraseFn;
-                        _2492_uneraseFn = ((_2488_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase")));
-                        s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _2491_rhsType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ::dafny_runtime::DafnyUnerasable<_>>::")), _2492_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _2487_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                        isOwned = _2488_recOwned;
-                        isErased = false;
-                        readIdents = _2490_recIdents;
-                      } else {
-                        Dafny.ISequence<Dafny.Rune> _out946;
-                        bool _out947;
-                        bool _out948;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out949;
-                        DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _2486_b), _2486_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out946, out _out947, out _out948, out _out949);
-                        s = _out946;
-                        isOwned = _out947;
-                        isErased = _out948;
-                        readIdents = _out949;
-                      }
-                    }
-                  }
-                } else if (_source80.is_Nullable) {
-                  DAST._IType _2493___mcc_h873 = _source80.dtor_Nullable_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2494_recursiveGen;
-                    bool _2495_recOwned;
-                    bool _2496_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2497_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out950;
-                    bool _out951;
-                    bool _out952;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out953;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out950, out _out951, out _out952, out _out953);
-                    _2494_recursiveGen = _out950;
-                    _2495_recOwned = _out951;
-                    _2496_recErased = _out952;
-                    _2497_recIdents = _out953;
-                    if (!(_2495_recOwned)) {
-                      _2494_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_2494_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".clone()"));
-                    }
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Some("), _2494_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                    isOwned = true;
-                    isErased = _2496_recErased;
-                    readIdents = _2497_recIdents;
-                  }
-                } else if (_source80.is_Tuple) {
-                  Dafny.ISequence<DAST._IType> _2498___mcc_h875 = _source80.dtor_Tuple_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2499_recursiveGen;
-                    bool _2500_recOwned;
-                    bool _2501_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2502_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out954;
-                    bool _out955;
-                    bool _out956;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out957;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out954, out _out955, out _out956, out _out957);
-                    _2499_recursiveGen = _out954;
-                    _2500_recOwned = _out955;
-                    _2501_recErased = _out956;
-                    _2502_recIdents = _out957;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2499_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2500_recOwned;
-                    isErased = _2501_recErased;
-                    readIdents = _2502_recIdents;
-                  }
-                } else if (_source80.is_Array) {
-                  DAST._IType _2503___mcc_h877 = _source80.dtor_element;
-                  BigInteger _2504___mcc_h878 = _source80.dtor_dims;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2505_recursiveGen;
-                    bool _2506_recOwned;
-                    bool _2507_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2508_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out958;
-                    bool _out959;
-                    bool _out960;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out961;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out958, out _out959, out _out960, out _out961);
-                    _2505_recursiveGen = _out958;
-                    _2506_recOwned = _out959;
-                    _2507_recErased = _out960;
-                    _2508_recIdents = _out961;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2505_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2506_recOwned;
-                    isErased = _2507_recErased;
-                    readIdents = _2508_recIdents;
-                  }
-                } else if (_source80.is_Seq) {
-                  DAST._IType _2509___mcc_h881 = _source80.dtor_element;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2510_recursiveGen;
-                    bool _2511_recOwned;
-                    bool _2512_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2513_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out962;
-                    bool _out963;
-                    bool _out964;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out965;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out962, out _out963, out _out964, out _out965);
-                    _2510_recursiveGen = _out962;
-                    _2511_recOwned = _out963;
-                    _2512_recErased = _out964;
-                    _2513_recIdents = _out965;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2510_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2511_recOwned;
-                    isErased = _2512_recErased;
-                    readIdents = _2513_recIdents;
-                  }
-                } else if (_source80.is_Set) {
-                  DAST._IType _2514___mcc_h883 = _source80.dtor_element;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2515_recursiveGen;
-                    bool _2516_recOwned;
-                    bool _2517_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2518_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out966;
-                    bool _out967;
-                    bool _out968;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out969;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out966, out _out967, out _out968, out _out969);
-                    _2515_recursiveGen = _out966;
-                    _2516_recOwned = _out967;
-                    _2517_recErased = _out968;
-                    _2518_recIdents = _out969;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2515_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2516_recOwned;
-                    isErased = _2517_recErased;
-                    readIdents = _2518_recIdents;
-                  }
-                } else if (_source80.is_Multiset) {
-                  DAST._IType _2519___mcc_h885 = _source80.dtor_element;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2520_recursiveGen;
-                    bool _2521_recOwned;
-                    bool _2522_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2523_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out970;
-                    bool _out971;
-                    bool _out972;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out973;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out970, out _out971, out _out972, out _out973);
-                    _2520_recursiveGen = _out970;
-                    _2521_recOwned = _out971;
-                    _2522_recErased = _out972;
-                    _2523_recIdents = _out973;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2520_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2521_recOwned;
-                    isErased = _2522_recErased;
-                    readIdents = _2523_recIdents;
-                  }
-                } else if (_source80.is_Map) {
-                  DAST._IType _2524___mcc_h887 = _source80.dtor_key;
-                  DAST._IType _2525___mcc_h888 = _source80.dtor_value;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2526_recursiveGen;
-                    bool _2527_recOwned;
-                    bool _2528_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2529_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out974;
-                    bool _out975;
-                    bool _out976;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out977;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out974, out _out975, out _out976, out _out977);
-                    _2526_recursiveGen = _out974;
-                    _2527_recOwned = _out975;
-                    _2528_recErased = _out976;
-                    _2529_recIdents = _out977;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2526_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2527_recOwned;
-                    isErased = _2528_recErased;
-                    readIdents = _2529_recIdents;
-                  }
-                } else if (_source80.is_Arrow) {
-                  Dafny.ISequence<DAST._IType> _2530___mcc_h891 = _source80.dtor_args;
-                  DAST._IType _2531___mcc_h892 = _source80.dtor_result;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2532_recursiveGen;
-                    bool _2533_recOwned;
-                    bool _2534_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2535_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out978;
-                    bool _out979;
-                    bool _out980;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out981;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out978, out _out979, out _out980, out _out981);
-                    _2532_recursiveGen = _out978;
-                    _2533_recOwned = _out979;
-                    _2534_recErased = _out980;
-                    _2535_recIdents = _out981;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2532_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2533_recOwned;
-                    isErased = _2534_recErased;
-                    readIdents = _2535_recIdents;
-                  }
-                } else if (_source80.is_Primitive) {
-                  DAST._IPrimitive _2536___mcc_h895 = _source80.dtor_Primitive_a0;
-                  DAST._IPrimitive _source82 = _2536___mcc_h895;
-                  if (_source82.is_Int) {
-                    {
-                      Dafny.ISequence<Dafny.Rune> _2537_recursiveGen;
-                      bool _2538_recOwned;
-                      bool _2539_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2540_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out982;
-                      bool _out983;
-                      bool _out984;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out985;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out982, out _out983, out _out984, out _out985);
-                      _2537_recursiveGen = _out982;
-                      _2538_recOwned = _out983;
-                      _2539_recErased = _out984;
-                      _2540_recIdents = _out985;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2537_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                      isOwned = _2538_recOwned;
-                      isErased = _2539_recErased;
-                      readIdents = _2540_recIdents;
-                    }
-                  } else if (_source82.is_Real) {
-                    {
-                      Dafny.ISequence<Dafny.Rune> _2541_recursiveGen;
-                      bool _2542___v46;
-                      bool _2543___v47;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2544_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out986;
-                      bool _out987;
-                      bool _out988;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out989;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, true, out _out986, out _out987, out _out988, out _out989);
-                      _2541_recursiveGen = _out986;
-                      _2542___v46 = _out987;
-                      _2543___v47 = _out988;
-                      _2544_recIdents = _out989;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::BigRational::from_integer("), _2541_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                      isOwned = true;
-                      isErased = true;
-                      readIdents = _2544_recIdents;
-                    }
-                  } else if (_source82.is_String) {
-                    {
-                      Dafny.ISequence<Dafny.Rune> _2545_recursiveGen;
-                      bool _2546_recOwned;
-                      bool _2547_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2548_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out990;
-                      bool _out991;
-                      bool _out992;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out993;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out990, out _out991, out _out992, out _out993);
-                      _2545_recursiveGen = _out990;
-                      _2546_recOwned = _out991;
-                      _2547_recErased = _out992;
-                      _2548_recIdents = _out993;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2545_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                      isOwned = _2546_recOwned;
-                      isErased = _2547_recErased;
-                      readIdents = _2548_recIdents;
-                    }
-                  } else if (_source82.is_Bool) {
-                    {
-                      Dafny.ISequence<Dafny.Rune> _2549_recursiveGen;
-                      bool _2550_recOwned;
-                      bool _2551_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2552_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out994;
-                      bool _out995;
-                      bool _out996;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out997;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out994, out _out995, out _out996, out _out997);
-                      _2549_recursiveGen = _out994;
-                      _2550_recOwned = _out995;
-                      _2551_recErased = _out996;
-                      _2552_recIdents = _out997;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2549_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                      isOwned = _2550_recOwned;
-                      isErased = _2551_recErased;
-                      readIdents = _2552_recIdents;
-                    }
-                  } else {
-                    {
-                      Dafny.ISequence<Dafny.Rune> _2553_rhsType;
-                      Dafny.ISequence<Dafny.Rune> _out998;
-                      _out998 = DCOMP.COMP.GenType(_1555_toTpe, true, false);
-                      _2553_rhsType = _out998;
-                      Dafny.ISequence<Dafny.Rune> _2554_recursiveGen;
-                      bool _2555___v56;
-                      bool _2556___v57;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2557_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out999;
-                      bool _out1000;
-                      bool _out1001;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1002;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, true, out _out999, out _out1000, out _out1001, out _out1002);
-                      _2554_recursiveGen = _out999;
-                      _2555___v56 = _out1000;
-                      _2556___v57 = _out1001;
-                      _2557_recIdents = _out1002;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("char::from_u32(<u32 as ::dafny_runtime::NumCast>::from("), _2554_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").unwrap()).unwrap()"));
-                      isOwned = true;
-                      isErased = true;
-                      readIdents = _2557_recIdents;
-                    }
-                  }
-                } else if (_source80.is_Passthrough) {
-                  Dafny.ISequence<Dafny.Rune> _2558___mcc_h897 = _source80.dtor_Passthrough_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2559_rhsType;
-                    Dafny.ISequence<Dafny.Rune> _out1003;
-                    _out1003 = DCOMP.COMP.GenType(_1555_toTpe, true, false);
-                    _2559_rhsType = _out1003;
-                    Dafny.ISequence<Dafny.Rune> _2560_recursiveGen;
-                    bool _2561___v51;
-                    bool _2562___v52;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2563_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1004;
-                    bool _out1005;
-                    bool _out1006;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1007;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, true, out _out1004, out _out1005, out _out1006, out _out1007);
-                    _2560_recursiveGen = _out1004;
-                    _2561___v51 = _out1005;
-                    _2562___v52 = _out1006;
-                    _2563_recIdents = _out1007;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _2559_rhsType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ::dafny_runtime::NumCast>::from(")), _2560_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").unwrap()"));
-                    isOwned = true;
-                    isErased = true;
-                    readIdents = _2563_recIdents;
-                  }
-                } else {
-                  Dafny.ISequence<Dafny.Rune> _2564___mcc_h899 = _source80.dtor_TypeArg_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2565_recursiveGen;
-                    bool _2566_recOwned;
-                    bool _2567_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2568_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1008;
-                    bool _out1009;
-                    bool _out1010;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1011;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1008, out _out1009, out _out1010, out _out1011);
-                    _2565_recursiveGen = _out1008;
-                    _2566_recOwned = _out1009;
-                    _2567_recErased = _out1010;
-                    _2568_recIdents = _out1011;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2565_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2566_recOwned;
-                    isErased = _2567_recErased;
-                    readIdents = _2568_recIdents;
-                  }
-                }
-              } else if (_source79.is_Real) {
-                DAST._IType _source83 = _1563___mcc_h306;
-                if (_source83.is_Path) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2569___mcc_h901 = _source83.dtor_Path_a0;
-                  Dafny.ISequence<DAST._IType> _2570___mcc_h902 = _source83.dtor_typeArgs;
-                  DAST._IResolvedType _2571___mcc_h903 = _source83.dtor_resolved;
-                  DAST._IResolvedType _source84 = _2571___mcc_h903;
-                  if (_source84.is_Datatype) {
-                    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2572___mcc_h907 = _source84.dtor_path;
-                    {
-                      Dafny.ISequence<Dafny.Rune> _2573_recursiveGen;
-                      bool _2574_recOwned;
-                      bool _2575_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2576_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out1012;
-                      bool _out1013;
-                      bool _out1014;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1015;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1012, out _out1013, out _out1014, out _out1015);
-                      _2573_recursiveGen = _out1012;
-                      _2574_recOwned = _out1013;
-                      _2575_recErased = _out1014;
-                      _2576_recIdents = _out1015;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2573_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                      isOwned = _2574_recOwned;
-                      isErased = _2575_recErased;
-                      readIdents = _2576_recIdents;
-                    }
-                  } else if (_source84.is_Trait) {
-                    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2577___mcc_h909 = _source84.dtor_path;
-                    {
-                      Dafny.ISequence<Dafny.Rune> _2578_recursiveGen;
-                      bool _2579_recOwned;
-                      bool _2580_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2581_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out1016;
-                      bool _out1017;
-                      bool _out1018;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1019;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1016, out _out1017, out _out1018, out _out1019);
-                      _2578_recursiveGen = _out1016;
-                      _2579_recOwned = _out1017;
-                      _2580_recErased = _out1018;
-                      _2581_recIdents = _out1019;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2578_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                      isOwned = _2579_recOwned;
-                      isErased = _2580_recErased;
-                      readIdents = _2581_recIdents;
-                    }
-                  } else {
-                    DAST._IType _2582___mcc_h911 = _source84.dtor_Newtype_a0;
-                    DAST._IType _2583_b = _2582___mcc_h911;
-                    {
-                      if (object.Equals(_1556_fromTpe, _2583_b)) {
-                        Dafny.ISequence<Dafny.Rune> _2584_recursiveGen;
-                        bool _2585_recOwned;
-                        bool _2586_recErased;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2587_recIdents;
-                        Dafny.ISequence<Dafny.Rune> _out1020;
-                        bool _out1021;
-                        bool _out1022;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1023;
-                        DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1020, out _out1021, out _out1022, out _out1023);
-                        _2584_recursiveGen = _out1020;
-                        _2585_recOwned = _out1021;
-                        _2586_recErased = _out1022;
-                        _2587_recIdents = _out1023;
-                        Dafny.ISequence<Dafny.Rune> _2588_rhsType;
-                        Dafny.ISequence<Dafny.Rune> _out1024;
-                        _out1024 = DCOMP.COMP.GenType(_1555_toTpe, true, false);
-                        _2588_rhsType = _out1024;
-                        Dafny.ISequence<Dafny.Rune> _2589_uneraseFn;
-                        _2589_uneraseFn = ((_2585_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase")));
-                        s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _2588_rhsType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ::dafny_runtime::DafnyUnerasable<_>>::")), _2589_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _2584_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                        isOwned = _2585_recOwned;
-                        isErased = false;
-                        readIdents = _2587_recIdents;
-                      } else {
-                        Dafny.ISequence<Dafny.Rune> _out1025;
-                        bool _out1026;
-                        bool _out1027;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1028;
-                        DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _2583_b), _2583_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out1025, out _out1026, out _out1027, out _out1028);
-                        s = _out1025;
-                        isOwned = _out1026;
-                        isErased = _out1027;
-                        readIdents = _out1028;
-                      }
-                    }
-                  }
-                } else if (_source83.is_Nullable) {
-                  DAST._IType _2590___mcc_h913 = _source83.dtor_Nullable_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2591_recursiveGen;
-                    bool _2592_recOwned;
-                    bool _2593_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2594_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1029;
-                    bool _out1030;
-                    bool _out1031;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1032;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1029, out _out1030, out _out1031, out _out1032);
-                    _2591_recursiveGen = _out1029;
-                    _2592_recOwned = _out1030;
-                    _2593_recErased = _out1031;
-                    _2594_recIdents = _out1032;
-                    if (!(_2592_recOwned)) {
-                      _2591_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_2591_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".clone()"));
-                    }
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Some("), _2591_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                    isOwned = true;
-                    isErased = _2593_recErased;
-                    readIdents = _2594_recIdents;
-                  }
-                } else if (_source83.is_Tuple) {
-                  Dafny.ISequence<DAST._IType> _2595___mcc_h915 = _source83.dtor_Tuple_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2596_recursiveGen;
-                    bool _2597_recOwned;
-                    bool _2598_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2599_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1033;
-                    bool _out1034;
-                    bool _out1035;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1036;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1033, out _out1034, out _out1035, out _out1036);
-                    _2596_recursiveGen = _out1033;
-                    _2597_recOwned = _out1034;
-                    _2598_recErased = _out1035;
-                    _2599_recIdents = _out1036;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2596_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2597_recOwned;
-                    isErased = _2598_recErased;
-                    readIdents = _2599_recIdents;
-                  }
-                } else if (_source83.is_Array) {
-                  DAST._IType _2600___mcc_h917 = _source83.dtor_element;
-                  BigInteger _2601___mcc_h918 = _source83.dtor_dims;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2602_recursiveGen;
-                    bool _2603_recOwned;
-                    bool _2604_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2605_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1037;
-                    bool _out1038;
-                    bool _out1039;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1040;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1037, out _out1038, out _out1039, out _out1040);
-                    _2602_recursiveGen = _out1037;
-                    _2603_recOwned = _out1038;
-                    _2604_recErased = _out1039;
-                    _2605_recIdents = _out1040;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2602_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2603_recOwned;
-                    isErased = _2604_recErased;
-                    readIdents = _2605_recIdents;
-                  }
-                } else if (_source83.is_Seq) {
-                  DAST._IType _2606___mcc_h921 = _source83.dtor_element;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2607_recursiveGen;
-                    bool _2608_recOwned;
-                    bool _2609_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2610_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1041;
-                    bool _out1042;
-                    bool _out1043;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1044;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1041, out _out1042, out _out1043, out _out1044);
-                    _2607_recursiveGen = _out1041;
-                    _2608_recOwned = _out1042;
-                    _2609_recErased = _out1043;
-                    _2610_recIdents = _out1044;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2607_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2608_recOwned;
-                    isErased = _2609_recErased;
-                    readIdents = _2610_recIdents;
-                  }
-                } else if (_source83.is_Set) {
-                  DAST._IType _2611___mcc_h923 = _source83.dtor_element;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2612_recursiveGen;
-                    bool _2613_recOwned;
-                    bool _2614_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2615_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1045;
-                    bool _out1046;
-                    bool _out1047;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1048;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1045, out _out1046, out _out1047, out _out1048);
-                    _2612_recursiveGen = _out1045;
-                    _2613_recOwned = _out1046;
-                    _2614_recErased = _out1047;
-                    _2615_recIdents = _out1048;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2612_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2613_recOwned;
-                    isErased = _2614_recErased;
-                    readIdents = _2615_recIdents;
-                  }
-                } else if (_source83.is_Multiset) {
-                  DAST._IType _2616___mcc_h925 = _source83.dtor_element;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2617_recursiveGen;
-                    bool _2618_recOwned;
-                    bool _2619_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2620_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1049;
-                    bool _out1050;
-                    bool _out1051;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1052;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1049, out _out1050, out _out1051, out _out1052);
-                    _2617_recursiveGen = _out1049;
-                    _2618_recOwned = _out1050;
-                    _2619_recErased = _out1051;
-                    _2620_recIdents = _out1052;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2617_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2618_recOwned;
-                    isErased = _2619_recErased;
-                    readIdents = _2620_recIdents;
-                  }
-                } else if (_source83.is_Map) {
-                  DAST._IType _2621___mcc_h927 = _source83.dtor_key;
-                  DAST._IType _2622___mcc_h928 = _source83.dtor_value;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2623_recursiveGen;
-                    bool _2624_recOwned;
-                    bool _2625_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2626_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1053;
-                    bool _out1054;
-                    bool _out1055;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1056;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1053, out _out1054, out _out1055, out _out1056);
-                    _2623_recursiveGen = _out1053;
-                    _2624_recOwned = _out1054;
-                    _2625_recErased = _out1055;
-                    _2626_recIdents = _out1056;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2623_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2624_recOwned;
-                    isErased = _2625_recErased;
-                    readIdents = _2626_recIdents;
-                  }
-                } else if (_source83.is_Arrow) {
-                  Dafny.ISequence<DAST._IType> _2627___mcc_h931 = _source83.dtor_args;
-                  DAST._IType _2628___mcc_h932 = _source83.dtor_result;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2629_recursiveGen;
-                    bool _2630_recOwned;
-                    bool _2631_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2632_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1057;
-                    bool _out1058;
-                    bool _out1059;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1060;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1057, out _out1058, out _out1059, out _out1060);
-                    _2629_recursiveGen = _out1057;
-                    _2630_recOwned = _out1058;
-                    _2631_recErased = _out1059;
-                    _2632_recIdents = _out1060;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2629_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2630_recOwned;
-                    isErased = _2631_recErased;
-                    readIdents = _2632_recIdents;
-                  }
-                } else if (_source83.is_Primitive) {
-                  DAST._IPrimitive _2633___mcc_h935 = _source83.dtor_Primitive_a0;
-                  DAST._IPrimitive _source85 = _2633___mcc_h935;
-                  if (_source85.is_Int) {
-                    {
-                      Dafny.ISequence<Dafny.Rune> _2634_recursiveGen;
-                      bool _2635___v48;
-                      bool _2636___v49;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2637_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out1061;
-                      bool _out1062;
-                      bool _out1063;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1064;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, false, out _out1061, out _out1062, out _out1063, out _out1064);
-                      _2634_recursiveGen = _out1061;
-                      _2635___v48 = _out1062;
-                      _2636___v49 = _out1063;
-                      _2637_recIdents = _out1064;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::dafny_rational_to_int("), _2634_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                      isOwned = true;
-                      isErased = true;
-                      readIdents = _2637_recIdents;
-                    }
-                  } else if (_source85.is_Real) {
-                    {
-                      Dafny.ISequence<Dafny.Rune> _2638_recursiveGen;
-                      bool _2639_recOwned;
-                      bool _2640_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2641_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out1065;
-                      bool _out1066;
-                      bool _out1067;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1068;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1065, out _out1066, out _out1067, out _out1068);
-                      _2638_recursiveGen = _out1065;
-                      _2639_recOwned = _out1066;
-                      _2640_recErased = _out1067;
-                      _2641_recIdents = _out1068;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2638_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                      isOwned = _2639_recOwned;
-                      isErased = _2640_recErased;
-                      readIdents = _2641_recIdents;
-                    }
-                  } else if (_source85.is_String) {
-                    {
-                      Dafny.ISequence<Dafny.Rune> _2642_recursiveGen;
-                      bool _2643_recOwned;
-                      bool _2644_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2645_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out1069;
-                      bool _out1070;
-                      bool _out1071;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1072;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1069, out _out1070, out _out1071, out _out1072);
-                      _2642_recursiveGen = _out1069;
-                      _2643_recOwned = _out1070;
-                      _2644_recErased = _out1071;
-                      _2645_recIdents = _out1072;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2642_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                      isOwned = _2643_recOwned;
-                      isErased = _2644_recErased;
-                      readIdents = _2645_recIdents;
-                    }
-                  } else if (_source85.is_Bool) {
-                    {
-                      Dafny.ISequence<Dafny.Rune> _2646_recursiveGen;
-                      bool _2647_recOwned;
-                      bool _2648_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2649_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out1073;
-                      bool _out1074;
-                      bool _out1075;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1076;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1073, out _out1074, out _out1075, out _out1076);
-                      _2646_recursiveGen = _out1073;
-                      _2647_recOwned = _out1074;
-                      _2648_recErased = _out1075;
-                      _2649_recIdents = _out1076;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2646_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                      isOwned = _2647_recOwned;
-                      isErased = _2648_recErased;
-                      readIdents = _2649_recIdents;
-                    }
-                  } else {
-                    {
-                      Dafny.ISequence<Dafny.Rune> _2650_recursiveGen;
-                      bool _2651_recOwned;
-                      bool _2652_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2653_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out1077;
-                      bool _out1078;
-                      bool _out1079;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1080;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1077, out _out1078, out _out1079, out _out1080);
-                      _2650_recursiveGen = _out1077;
-                      _2651_recOwned = _out1078;
-                      _2652_recErased = _out1079;
-                      _2653_recIdents = _out1080;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2650_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                      isOwned = _2651_recOwned;
-                      isErased = _2652_recErased;
-                      readIdents = _2653_recIdents;
-                    }
-                  }
-                } else if (_source83.is_Passthrough) {
-                  Dafny.ISequence<Dafny.Rune> _2654___mcc_h937 = _source83.dtor_Passthrough_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2655_recursiveGen;
-                    bool _2656_recOwned;
-                    bool _2657_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2658_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1081;
-                    bool _out1082;
-                    bool _out1083;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1084;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1081, out _out1082, out _out1083, out _out1084);
-                    _2655_recursiveGen = _out1081;
-                    _2656_recOwned = _out1082;
-                    _2657_recErased = _out1083;
-                    _2658_recIdents = _out1084;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2655_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2656_recOwned;
-                    isErased = _2657_recErased;
-                    readIdents = _2658_recIdents;
-                  }
-                } else {
-                  Dafny.ISequence<Dafny.Rune> _2659___mcc_h939 = _source83.dtor_TypeArg_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2660_recursiveGen;
-                    bool _2661_recOwned;
-                    bool _2662_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2663_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1085;
-                    bool _out1086;
-                    bool _out1087;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1088;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1085, out _out1086, out _out1087, out _out1088);
-                    _2660_recursiveGen = _out1085;
-                    _2661_recOwned = _out1086;
-                    _2662_recErased = _out1087;
-                    _2663_recIdents = _out1088;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2660_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2661_recOwned;
-                    isErased = _2662_recErased;
-                    readIdents = _2663_recIdents;
-                  }
-                }
-              } else if (_source79.is_String) {
-                DAST._IType _source86 = _1563___mcc_h306;
-                if (_source86.is_Path) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2664___mcc_h941 = _source86.dtor_Path_a0;
-                  Dafny.ISequence<DAST._IType> _2665___mcc_h942 = _source86.dtor_typeArgs;
-                  DAST._IResolvedType _2666___mcc_h943 = _source86.dtor_resolved;
-                  DAST._IResolvedType _source87 = _2666___mcc_h943;
-                  if (_source87.is_Datatype) {
-                    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2667___mcc_h947 = _source87.dtor_path;
-                    {
-                      Dafny.ISequence<Dafny.Rune> _2668_recursiveGen;
-                      bool _2669_recOwned;
-                      bool _2670_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2671_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out1089;
-                      bool _out1090;
-                      bool _out1091;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1092;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1089, out _out1090, out _out1091, out _out1092);
-                      _2668_recursiveGen = _out1089;
-                      _2669_recOwned = _out1090;
-                      _2670_recErased = _out1091;
-                      _2671_recIdents = _out1092;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2668_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                      isOwned = _2669_recOwned;
-                      isErased = _2670_recErased;
-                      readIdents = _2671_recIdents;
-                    }
-                  } else if (_source87.is_Trait) {
-                    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2672___mcc_h949 = _source87.dtor_path;
-                    {
-                      Dafny.ISequence<Dafny.Rune> _2673_recursiveGen;
-                      bool _2674_recOwned;
-                      bool _2675_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2676_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out1093;
-                      bool _out1094;
-                      bool _out1095;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1096;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1093, out _out1094, out _out1095, out _out1096);
-                      _2673_recursiveGen = _out1093;
-                      _2674_recOwned = _out1094;
-                      _2675_recErased = _out1095;
-                      _2676_recIdents = _out1096;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2673_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                      isOwned = _2674_recOwned;
-                      isErased = _2675_recErased;
-                      readIdents = _2676_recIdents;
-                    }
-                  } else {
-                    DAST._IType _2677___mcc_h951 = _source87.dtor_Newtype_a0;
-                    DAST._IType _2678_b = _2677___mcc_h951;
-                    {
-                      if (object.Equals(_1556_fromTpe, _2678_b)) {
-                        Dafny.ISequence<Dafny.Rune> _2679_recursiveGen;
-                        bool _2680_recOwned;
-                        bool _2681_recErased;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2682_recIdents;
-                        Dafny.ISequence<Dafny.Rune> _out1097;
-                        bool _out1098;
-                        bool _out1099;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1100;
-                        DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1097, out _out1098, out _out1099, out _out1100);
-                        _2679_recursiveGen = _out1097;
-                        _2680_recOwned = _out1098;
-                        _2681_recErased = _out1099;
-                        _2682_recIdents = _out1100;
-                        Dafny.ISequence<Dafny.Rune> _2683_rhsType;
-                        Dafny.ISequence<Dafny.Rune> _out1101;
-                        _out1101 = DCOMP.COMP.GenType(_1555_toTpe, true, false);
-                        _2683_rhsType = _out1101;
-                        Dafny.ISequence<Dafny.Rune> _2684_uneraseFn;
-                        _2684_uneraseFn = ((_2680_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase")));
-                        s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _2683_rhsType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ::dafny_runtime::DafnyUnerasable<_>>::")), _2684_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _2679_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                        isOwned = _2680_recOwned;
-                        isErased = false;
-                        readIdents = _2682_recIdents;
-                      } else {
-                        Dafny.ISequence<Dafny.Rune> _out1102;
-                        bool _out1103;
-                        bool _out1104;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1105;
-                        DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _2678_b), _2678_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out1102, out _out1103, out _out1104, out _out1105);
-                        s = _out1102;
-                        isOwned = _out1103;
-                        isErased = _out1104;
-                        readIdents = _out1105;
-                      }
-                    }
-                  }
-                } else if (_source86.is_Nullable) {
-                  DAST._IType _2685___mcc_h953 = _source86.dtor_Nullable_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2686_recursiveGen;
-                    bool _2687_recOwned;
-                    bool _2688_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2689_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1106;
-                    bool _out1107;
-                    bool _out1108;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1109;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1106, out _out1107, out _out1108, out _out1109);
-                    _2686_recursiveGen = _out1106;
-                    _2687_recOwned = _out1107;
-                    _2688_recErased = _out1108;
-                    _2689_recIdents = _out1109;
-                    if (!(_2687_recOwned)) {
-                      _2686_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_2686_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".clone()"));
-                    }
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Some("), _2686_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                    isOwned = true;
-                    isErased = _2688_recErased;
-                    readIdents = _2689_recIdents;
-                  }
-                } else if (_source86.is_Tuple) {
-                  Dafny.ISequence<DAST._IType> _2690___mcc_h955 = _source86.dtor_Tuple_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2691_recursiveGen;
-                    bool _2692_recOwned;
-                    bool _2693_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2694_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1110;
-                    bool _out1111;
-                    bool _out1112;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1113;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1110, out _out1111, out _out1112, out _out1113);
-                    _2691_recursiveGen = _out1110;
-                    _2692_recOwned = _out1111;
-                    _2693_recErased = _out1112;
-                    _2694_recIdents = _out1113;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2691_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2692_recOwned;
-                    isErased = _2693_recErased;
-                    readIdents = _2694_recIdents;
-                  }
-                } else if (_source86.is_Array) {
-                  DAST._IType _2695___mcc_h957 = _source86.dtor_element;
-                  BigInteger _2696___mcc_h958 = _source86.dtor_dims;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2697_recursiveGen;
-                    bool _2698_recOwned;
-                    bool _2699_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2700_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1114;
-                    bool _out1115;
-                    bool _out1116;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1117;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1114, out _out1115, out _out1116, out _out1117);
-                    _2697_recursiveGen = _out1114;
-                    _2698_recOwned = _out1115;
-                    _2699_recErased = _out1116;
-                    _2700_recIdents = _out1117;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2697_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2698_recOwned;
-                    isErased = _2699_recErased;
-                    readIdents = _2700_recIdents;
-                  }
-                } else if (_source86.is_Seq) {
-                  DAST._IType _2701___mcc_h961 = _source86.dtor_element;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2702_recursiveGen;
-                    bool _2703_recOwned;
-                    bool _2704_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2705_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1118;
-                    bool _out1119;
-                    bool _out1120;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1121;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1118, out _out1119, out _out1120, out _out1121);
-                    _2702_recursiveGen = _out1118;
-                    _2703_recOwned = _out1119;
-                    _2704_recErased = _out1120;
-                    _2705_recIdents = _out1121;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2702_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2703_recOwned;
-                    isErased = _2704_recErased;
-                    readIdents = _2705_recIdents;
-                  }
-                } else if (_source86.is_Set) {
-                  DAST._IType _2706___mcc_h963 = _source86.dtor_element;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2707_recursiveGen;
-                    bool _2708_recOwned;
-                    bool _2709_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2710_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1122;
-                    bool _out1123;
-                    bool _out1124;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1125;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1122, out _out1123, out _out1124, out _out1125);
-                    _2707_recursiveGen = _out1122;
-                    _2708_recOwned = _out1123;
-                    _2709_recErased = _out1124;
-                    _2710_recIdents = _out1125;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2707_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2708_recOwned;
-                    isErased = _2709_recErased;
-                    readIdents = _2710_recIdents;
-                  }
-                } else if (_source86.is_Multiset) {
-                  DAST._IType _2711___mcc_h965 = _source86.dtor_element;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2712_recursiveGen;
-                    bool _2713_recOwned;
-                    bool _2714_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2715_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1126;
-                    bool _out1127;
-                    bool _out1128;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1129;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1126, out _out1127, out _out1128, out _out1129);
-                    _2712_recursiveGen = _out1126;
-                    _2713_recOwned = _out1127;
-                    _2714_recErased = _out1128;
-                    _2715_recIdents = _out1129;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2712_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2713_recOwned;
-                    isErased = _2714_recErased;
-                    readIdents = _2715_recIdents;
-                  }
-                } else if (_source86.is_Map) {
-                  DAST._IType _2716___mcc_h967 = _source86.dtor_key;
-                  DAST._IType _2717___mcc_h968 = _source86.dtor_value;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2718_recursiveGen;
-                    bool _2719_recOwned;
-                    bool _2720_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2721_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1130;
-                    bool _out1131;
-                    bool _out1132;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1133;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1130, out _out1131, out _out1132, out _out1133);
-                    _2718_recursiveGen = _out1130;
-                    _2719_recOwned = _out1131;
-                    _2720_recErased = _out1132;
-                    _2721_recIdents = _out1133;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2718_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2719_recOwned;
-                    isErased = _2720_recErased;
-                    readIdents = _2721_recIdents;
-                  }
-                } else if (_source86.is_Arrow) {
-                  Dafny.ISequence<DAST._IType> _2722___mcc_h971 = _source86.dtor_args;
-                  DAST._IType _2723___mcc_h972 = _source86.dtor_result;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2724_recursiveGen;
-                    bool _2725_recOwned;
-                    bool _2726_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2727_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1134;
-                    bool _out1135;
-                    bool _out1136;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1137;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1134, out _out1135, out _out1136, out _out1137);
-                    _2724_recursiveGen = _out1134;
-                    _2725_recOwned = _out1135;
-                    _2726_recErased = _out1136;
-                    _2727_recIdents = _out1137;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2724_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2725_recOwned;
-                    isErased = _2726_recErased;
-                    readIdents = _2727_recIdents;
-                  }
-                } else if (_source86.is_Primitive) {
-                  DAST._IPrimitive _2728___mcc_h975 = _source86.dtor_Primitive_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2729_recursiveGen;
-                    bool _2730_recOwned;
-                    bool _2731_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2732_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1138;
-                    bool _out1139;
-                    bool _out1140;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1141;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1138, out _out1139, out _out1140, out _out1141);
-                    _2729_recursiveGen = _out1138;
-                    _2730_recOwned = _out1139;
-                    _2731_recErased = _out1140;
-                    _2732_recIdents = _out1141;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2729_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2730_recOwned;
-                    isErased = _2731_recErased;
-                    readIdents = _2732_recIdents;
-                  }
-                } else if (_source86.is_Passthrough) {
-                  Dafny.ISequence<Dafny.Rune> _2733___mcc_h977 = _source86.dtor_Passthrough_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2734_recursiveGen;
-                    bool _2735_recOwned;
-                    bool _2736_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2737_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1142;
-                    bool _out1143;
-                    bool _out1144;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1145;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1142, out _out1143, out _out1144, out _out1145);
-                    _2734_recursiveGen = _out1142;
-                    _2735_recOwned = _out1143;
-                    _2736_recErased = _out1144;
-                    _2737_recIdents = _out1145;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2734_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2735_recOwned;
-                    isErased = _2736_recErased;
-                    readIdents = _2737_recIdents;
-                  }
-                } else {
-                  Dafny.ISequence<Dafny.Rune> _2738___mcc_h979 = _source86.dtor_TypeArg_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2739_recursiveGen;
-                    bool _2740_recOwned;
-                    bool _2741_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2742_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1146;
-                    bool _out1147;
-                    bool _out1148;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1149;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1146, out _out1147, out _out1148, out _out1149);
-                    _2739_recursiveGen = _out1146;
-                    _2740_recOwned = _out1147;
-                    _2741_recErased = _out1148;
-                    _2742_recIdents = _out1149;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2739_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2740_recOwned;
-                    isErased = _2741_recErased;
-                    readIdents = _2742_recIdents;
-                  }
-                }
-              } else if (_source79.is_Bool) {
-                DAST._IType _source88 = _1563___mcc_h306;
-                if (_source88.is_Path) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2743___mcc_h981 = _source88.dtor_Path_a0;
-                  Dafny.ISequence<DAST._IType> _2744___mcc_h982 = _source88.dtor_typeArgs;
-                  DAST._IResolvedType _2745___mcc_h983 = _source88.dtor_resolved;
-                  DAST._IResolvedType _source89 = _2745___mcc_h983;
-                  if (_source89.is_Datatype) {
-                    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2746___mcc_h987 = _source89.dtor_path;
-                    {
-                      Dafny.ISequence<Dafny.Rune> _2747_recursiveGen;
-                      bool _2748_recOwned;
-                      bool _2749_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2750_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out1150;
-                      bool _out1151;
-                      bool _out1152;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1153;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1150, out _out1151, out _out1152, out _out1153);
-                      _2747_recursiveGen = _out1150;
-                      _2748_recOwned = _out1151;
-                      _2749_recErased = _out1152;
-                      _2750_recIdents = _out1153;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2747_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                      isOwned = _2748_recOwned;
-                      isErased = _2749_recErased;
-                      readIdents = _2750_recIdents;
-                    }
-                  } else if (_source89.is_Trait) {
-                    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2751___mcc_h989 = _source89.dtor_path;
-                    {
-                      Dafny.ISequence<Dafny.Rune> _2752_recursiveGen;
-                      bool _2753_recOwned;
-                      bool _2754_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2755_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out1154;
-                      bool _out1155;
-                      bool _out1156;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1157;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1154, out _out1155, out _out1156, out _out1157);
-                      _2752_recursiveGen = _out1154;
-                      _2753_recOwned = _out1155;
-                      _2754_recErased = _out1156;
-                      _2755_recIdents = _out1157;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2752_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                      isOwned = _2753_recOwned;
-                      isErased = _2754_recErased;
-                      readIdents = _2755_recIdents;
-                    }
-                  } else {
-                    DAST._IType _2756___mcc_h991 = _source89.dtor_Newtype_a0;
-                    DAST._IType _2757_b = _2756___mcc_h991;
-                    {
-                      if (object.Equals(_1556_fromTpe, _2757_b)) {
-                        Dafny.ISequence<Dafny.Rune> _2758_recursiveGen;
-                        bool _2759_recOwned;
-                        bool _2760_recErased;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2761_recIdents;
-                        Dafny.ISequence<Dafny.Rune> _out1158;
-                        bool _out1159;
-                        bool _out1160;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1161;
-                        DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1158, out _out1159, out _out1160, out _out1161);
-                        _2758_recursiveGen = _out1158;
-                        _2759_recOwned = _out1159;
-                        _2760_recErased = _out1160;
-                        _2761_recIdents = _out1161;
-                        Dafny.ISequence<Dafny.Rune> _2762_rhsType;
-                        Dafny.ISequence<Dafny.Rune> _out1162;
-                        _out1162 = DCOMP.COMP.GenType(_1555_toTpe, true, false);
-                        _2762_rhsType = _out1162;
-                        Dafny.ISequence<Dafny.Rune> _2763_uneraseFn;
-                        _2763_uneraseFn = ((_2759_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase")));
-                        s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _2762_rhsType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ::dafny_runtime::DafnyUnerasable<_>>::")), _2763_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _2758_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                        isOwned = _2759_recOwned;
-                        isErased = false;
-                        readIdents = _2761_recIdents;
-                      } else {
-                        Dafny.ISequence<Dafny.Rune> _out1163;
-                        bool _out1164;
-                        bool _out1165;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1166;
-                        DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _2757_b), _2757_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out1163, out _out1164, out _out1165, out _out1166);
-                        s = _out1163;
-                        isOwned = _out1164;
-                        isErased = _out1165;
-                        readIdents = _out1166;
-                      }
-                    }
-                  }
-                } else if (_source88.is_Nullable) {
-                  DAST._IType _2764___mcc_h993 = _source88.dtor_Nullable_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2765_recursiveGen;
-                    bool _2766_recOwned;
-                    bool _2767_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2768_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1167;
-                    bool _out1168;
-                    bool _out1169;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1170;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1167, out _out1168, out _out1169, out _out1170);
-                    _2765_recursiveGen = _out1167;
-                    _2766_recOwned = _out1168;
-                    _2767_recErased = _out1169;
-                    _2768_recIdents = _out1170;
-                    if (!(_2766_recOwned)) {
-                      _2765_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_2765_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".clone()"));
-                    }
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Some("), _2765_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                    isOwned = true;
-                    isErased = _2767_recErased;
-                    readIdents = _2768_recIdents;
-                  }
-                } else if (_source88.is_Tuple) {
-                  Dafny.ISequence<DAST._IType> _2769___mcc_h995 = _source88.dtor_Tuple_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2770_recursiveGen;
-                    bool _2771_recOwned;
-                    bool _2772_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2773_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1171;
-                    bool _out1172;
-                    bool _out1173;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1174;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1171, out _out1172, out _out1173, out _out1174);
-                    _2770_recursiveGen = _out1171;
-                    _2771_recOwned = _out1172;
-                    _2772_recErased = _out1173;
-                    _2773_recIdents = _out1174;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2770_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2771_recOwned;
-                    isErased = _2772_recErased;
-                    readIdents = _2773_recIdents;
-                  }
-                } else if (_source88.is_Array) {
-                  DAST._IType _2774___mcc_h997 = _source88.dtor_element;
-                  BigInteger _2775___mcc_h998 = _source88.dtor_dims;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2776_recursiveGen;
-                    bool _2777_recOwned;
-                    bool _2778_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2779_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1175;
-                    bool _out1176;
-                    bool _out1177;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1178;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1175, out _out1176, out _out1177, out _out1178);
-                    _2776_recursiveGen = _out1175;
-                    _2777_recOwned = _out1176;
-                    _2778_recErased = _out1177;
-                    _2779_recIdents = _out1178;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2776_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2777_recOwned;
-                    isErased = _2778_recErased;
-                    readIdents = _2779_recIdents;
-                  }
-                } else if (_source88.is_Seq) {
-                  DAST._IType _2780___mcc_h1001 = _source88.dtor_element;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2781_recursiveGen;
-                    bool _2782_recOwned;
-                    bool _2783_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2784_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1179;
-                    bool _out1180;
-                    bool _out1181;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1182;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1179, out _out1180, out _out1181, out _out1182);
-                    _2781_recursiveGen = _out1179;
-                    _2782_recOwned = _out1180;
-                    _2783_recErased = _out1181;
-                    _2784_recIdents = _out1182;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2781_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2782_recOwned;
-                    isErased = _2783_recErased;
-                    readIdents = _2784_recIdents;
-                  }
-                } else if (_source88.is_Set) {
-                  DAST._IType _2785___mcc_h1003 = _source88.dtor_element;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2786_recursiveGen;
-                    bool _2787_recOwned;
-                    bool _2788_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2789_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1183;
-                    bool _out1184;
-                    bool _out1185;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1186;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1183, out _out1184, out _out1185, out _out1186);
-                    _2786_recursiveGen = _out1183;
-                    _2787_recOwned = _out1184;
-                    _2788_recErased = _out1185;
-                    _2789_recIdents = _out1186;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2786_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2787_recOwned;
-                    isErased = _2788_recErased;
-                    readIdents = _2789_recIdents;
-                  }
-                } else if (_source88.is_Multiset) {
-                  DAST._IType _2790___mcc_h1005 = _source88.dtor_element;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2791_recursiveGen;
-                    bool _2792_recOwned;
-                    bool _2793_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2794_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1187;
-                    bool _out1188;
-                    bool _out1189;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1190;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1187, out _out1188, out _out1189, out _out1190);
-                    _2791_recursiveGen = _out1187;
-                    _2792_recOwned = _out1188;
-                    _2793_recErased = _out1189;
-                    _2794_recIdents = _out1190;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2791_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2792_recOwned;
-                    isErased = _2793_recErased;
-                    readIdents = _2794_recIdents;
-                  }
-                } else if (_source88.is_Map) {
-                  DAST._IType _2795___mcc_h1007 = _source88.dtor_key;
-                  DAST._IType _2796___mcc_h1008 = _source88.dtor_value;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2797_recursiveGen;
-                    bool _2798_recOwned;
-                    bool _2799_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2800_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1191;
-                    bool _out1192;
-                    bool _out1193;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1194;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1191, out _out1192, out _out1193, out _out1194);
-                    _2797_recursiveGen = _out1191;
-                    _2798_recOwned = _out1192;
-                    _2799_recErased = _out1193;
-                    _2800_recIdents = _out1194;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2797_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2798_recOwned;
-                    isErased = _2799_recErased;
-                    readIdents = _2800_recIdents;
-                  }
-                } else if (_source88.is_Arrow) {
-                  Dafny.ISequence<DAST._IType> _2801___mcc_h1011 = _source88.dtor_args;
-                  DAST._IType _2802___mcc_h1012 = _source88.dtor_result;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2803_recursiveGen;
-                    bool _2804_recOwned;
-                    bool _2805_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2806_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1195;
-                    bool _out1196;
-                    bool _out1197;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1198;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1195, out _out1196, out _out1197, out _out1198);
-                    _2803_recursiveGen = _out1195;
-                    _2804_recOwned = _out1196;
-                    _2805_recErased = _out1197;
-                    _2806_recIdents = _out1198;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2803_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2804_recOwned;
-                    isErased = _2805_recErased;
-                    readIdents = _2806_recIdents;
-                  }
-                } else if (_source88.is_Primitive) {
-                  DAST._IPrimitive _2807___mcc_h1015 = _source88.dtor_Primitive_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2808_recursiveGen;
-                    bool _2809_recOwned;
-                    bool _2810_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2811_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1199;
-                    bool _out1200;
-                    bool _out1201;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1202;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1199, out _out1200, out _out1201, out _out1202);
-                    _2808_recursiveGen = _out1199;
-                    _2809_recOwned = _out1200;
-                    _2810_recErased = _out1201;
-                    _2811_recIdents = _out1202;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2808_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2809_recOwned;
-                    isErased = _2810_recErased;
-                    readIdents = _2811_recIdents;
-                  }
-                } else if (_source88.is_Passthrough) {
-                  Dafny.ISequence<Dafny.Rune> _2812___mcc_h1017 = _source88.dtor_Passthrough_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2813_recursiveGen;
-                    bool _2814_recOwned;
-                    bool _2815_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2816_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1203;
-                    bool _out1204;
-                    bool _out1205;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1206;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1203, out _out1204, out _out1205, out _out1206);
-                    _2813_recursiveGen = _out1203;
-                    _2814_recOwned = _out1204;
-                    _2815_recErased = _out1205;
-                    _2816_recIdents = _out1206;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2813_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2814_recOwned;
-                    isErased = _2815_recErased;
-                    readIdents = _2816_recIdents;
-                  }
-                } else {
-                  Dafny.ISequence<Dafny.Rune> _2817___mcc_h1019 = _source88.dtor_TypeArg_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2818_recursiveGen;
-                    bool _2819_recOwned;
-                    bool _2820_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2821_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1207;
-                    bool _out1208;
-                    bool _out1209;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1210;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1207, out _out1208, out _out1209, out _out1210);
-                    _2818_recursiveGen = _out1207;
-                    _2819_recOwned = _out1208;
-                    _2820_recErased = _out1209;
-                    _2821_recIdents = _out1210;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2818_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2819_recOwned;
-                    isErased = _2820_recErased;
-                    readIdents = _2821_recIdents;
-                  }
-                }
-              } else {
-                DAST._IType _source90 = _1563___mcc_h306;
-                if (_source90.is_Path) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2822___mcc_h1021 = _source90.dtor_Path_a0;
-                  Dafny.ISequence<DAST._IType> _2823___mcc_h1022 = _source90.dtor_typeArgs;
-                  DAST._IResolvedType _2824___mcc_h1023 = _source90.dtor_resolved;
-                  DAST._IResolvedType _source91 = _2824___mcc_h1023;
-                  if (_source91.is_Datatype) {
-                    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2825___mcc_h1027 = _source91.dtor_path;
-                    {
-                      Dafny.ISequence<Dafny.Rune> _2826_recursiveGen;
-                      bool _2827_recOwned;
-                      bool _2828_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2829_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out1211;
-                      bool _out1212;
-                      bool _out1213;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1214;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1211, out _out1212, out _out1213, out _out1214);
-                      _2826_recursiveGen = _out1211;
-                      _2827_recOwned = _out1212;
-                      _2828_recErased = _out1213;
-                      _2829_recIdents = _out1214;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2826_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                      isOwned = _2827_recOwned;
-                      isErased = _2828_recErased;
-                      readIdents = _2829_recIdents;
-                    }
-                  } else if (_source91.is_Trait) {
-                    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2830___mcc_h1029 = _source91.dtor_path;
-                    {
-                      Dafny.ISequence<Dafny.Rune> _2831_recursiveGen;
-                      bool _2832_recOwned;
-                      bool _2833_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2834_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out1215;
-                      bool _out1216;
-                      bool _out1217;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1218;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1215, out _out1216, out _out1217, out _out1218);
-                      _2831_recursiveGen = _out1215;
-                      _2832_recOwned = _out1216;
-                      _2833_recErased = _out1217;
-                      _2834_recIdents = _out1218;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2831_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                      isOwned = _2832_recOwned;
-                      isErased = _2833_recErased;
-                      readIdents = _2834_recIdents;
-                    }
-                  } else {
-                    DAST._IType _2835___mcc_h1031 = _source91.dtor_Newtype_a0;
-                    DAST._IType _2836_b = _2835___mcc_h1031;
-                    {
-                      if (object.Equals(_1556_fromTpe, _2836_b)) {
-                        Dafny.ISequence<Dafny.Rune> _2837_recursiveGen;
-                        bool _2838_recOwned;
-                        bool _2839_recErased;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2840_recIdents;
-                        Dafny.ISequence<Dafny.Rune> _out1219;
-                        bool _out1220;
-                        bool _out1221;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1222;
-                        DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1219, out _out1220, out _out1221, out _out1222);
-                        _2837_recursiveGen = _out1219;
-                        _2838_recOwned = _out1220;
-                        _2839_recErased = _out1221;
-                        _2840_recIdents = _out1222;
-                        Dafny.ISequence<Dafny.Rune> _2841_rhsType;
-                        Dafny.ISequence<Dafny.Rune> _out1223;
-                        _out1223 = DCOMP.COMP.GenType(_1555_toTpe, true, false);
-                        _2841_rhsType = _out1223;
-                        Dafny.ISequence<Dafny.Rune> _2842_uneraseFn;
-                        _2842_uneraseFn = ((_2838_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase")));
-                        s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _2841_rhsType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ::dafny_runtime::DafnyUnerasable<_>>::")), _2842_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _2837_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                        isOwned = _2838_recOwned;
-                        isErased = false;
-                        readIdents = _2840_recIdents;
-                      } else {
-                        Dafny.ISequence<Dafny.Rune> _out1224;
-                        bool _out1225;
-                        bool _out1226;
-                        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1227;
-                        DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _2836_b), _2836_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out1224, out _out1225, out _out1226, out _out1227);
-                        s = _out1224;
-                        isOwned = _out1225;
-                        isErased = _out1226;
-                        readIdents = _out1227;
-                      }
-                    }
-                  }
-                } else if (_source90.is_Nullable) {
-                  DAST._IType _2843___mcc_h1033 = _source90.dtor_Nullable_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2844_recursiveGen;
-                    bool _2845_recOwned;
-                    bool _2846_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2847_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1228;
-                    bool _out1229;
-                    bool _out1230;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1231;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1228, out _out1229, out _out1230, out _out1231);
-                    _2844_recursiveGen = _out1228;
-                    _2845_recOwned = _out1229;
-                    _2846_recErased = _out1230;
-                    _2847_recIdents = _out1231;
-                    if (!(_2845_recOwned)) {
-                      _2844_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_2844_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".clone()"));
-                    }
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Some("), _2844_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                    isOwned = true;
-                    isErased = _2846_recErased;
-                    readIdents = _2847_recIdents;
-                  }
-                } else if (_source90.is_Tuple) {
-                  Dafny.ISequence<DAST._IType> _2848___mcc_h1035 = _source90.dtor_Tuple_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2849_recursiveGen;
-                    bool _2850_recOwned;
-                    bool _2851_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2852_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1232;
-                    bool _out1233;
-                    bool _out1234;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1235;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1232, out _out1233, out _out1234, out _out1235);
-                    _2849_recursiveGen = _out1232;
-                    _2850_recOwned = _out1233;
-                    _2851_recErased = _out1234;
-                    _2852_recIdents = _out1235;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2849_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2850_recOwned;
-                    isErased = _2851_recErased;
-                    readIdents = _2852_recIdents;
-                  }
-                } else if (_source90.is_Array) {
-                  DAST._IType _2853___mcc_h1037 = _source90.dtor_element;
-                  BigInteger _2854___mcc_h1038 = _source90.dtor_dims;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2855_recursiveGen;
-                    bool _2856_recOwned;
-                    bool _2857_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2858_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1236;
-                    bool _out1237;
-                    bool _out1238;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1239;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1236, out _out1237, out _out1238, out _out1239);
-                    _2855_recursiveGen = _out1236;
-                    _2856_recOwned = _out1237;
-                    _2857_recErased = _out1238;
-                    _2858_recIdents = _out1239;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2855_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2856_recOwned;
-                    isErased = _2857_recErased;
-                    readIdents = _2858_recIdents;
-                  }
-                } else if (_source90.is_Seq) {
-                  DAST._IType _2859___mcc_h1041 = _source90.dtor_element;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2860_recursiveGen;
-                    bool _2861_recOwned;
-                    bool _2862_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2863_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1240;
-                    bool _out1241;
-                    bool _out1242;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1243;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1240, out _out1241, out _out1242, out _out1243);
-                    _2860_recursiveGen = _out1240;
-                    _2861_recOwned = _out1241;
-                    _2862_recErased = _out1242;
-                    _2863_recIdents = _out1243;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2860_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2861_recOwned;
-                    isErased = _2862_recErased;
-                    readIdents = _2863_recIdents;
-                  }
-                } else if (_source90.is_Set) {
-                  DAST._IType _2864___mcc_h1043 = _source90.dtor_element;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2865_recursiveGen;
-                    bool _2866_recOwned;
-                    bool _2867_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2868_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1244;
-                    bool _out1245;
-                    bool _out1246;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1247;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1244, out _out1245, out _out1246, out _out1247);
-                    _2865_recursiveGen = _out1244;
-                    _2866_recOwned = _out1245;
-                    _2867_recErased = _out1246;
-                    _2868_recIdents = _out1247;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2865_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2866_recOwned;
-                    isErased = _2867_recErased;
-                    readIdents = _2868_recIdents;
-                  }
-                } else if (_source90.is_Multiset) {
-                  DAST._IType _2869___mcc_h1045 = _source90.dtor_element;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2870_recursiveGen;
-                    bool _2871_recOwned;
-                    bool _2872_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2873_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1248;
-                    bool _out1249;
-                    bool _out1250;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1251;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1248, out _out1249, out _out1250, out _out1251);
-                    _2870_recursiveGen = _out1248;
-                    _2871_recOwned = _out1249;
-                    _2872_recErased = _out1250;
-                    _2873_recIdents = _out1251;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2870_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2871_recOwned;
-                    isErased = _2872_recErased;
-                    readIdents = _2873_recIdents;
-                  }
-                } else if (_source90.is_Map) {
-                  DAST._IType _2874___mcc_h1047 = _source90.dtor_key;
-                  DAST._IType _2875___mcc_h1048 = _source90.dtor_value;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2876_recursiveGen;
-                    bool _2877_recOwned;
-                    bool _2878_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2879_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1252;
-                    bool _out1253;
-                    bool _out1254;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1255;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1252, out _out1253, out _out1254, out _out1255);
-                    _2876_recursiveGen = _out1252;
-                    _2877_recOwned = _out1253;
-                    _2878_recErased = _out1254;
-                    _2879_recIdents = _out1255;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2876_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2877_recOwned;
-                    isErased = _2878_recErased;
-                    readIdents = _2879_recIdents;
-                  }
-                } else if (_source90.is_Arrow) {
-                  Dafny.ISequence<DAST._IType> _2880___mcc_h1051 = _source90.dtor_args;
-                  DAST._IType _2881___mcc_h1052 = _source90.dtor_result;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2882_recursiveGen;
-                    bool _2883_recOwned;
-                    bool _2884_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2885_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1256;
-                    bool _out1257;
-                    bool _out1258;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1259;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1256, out _out1257, out _out1258, out _out1259);
-                    _2882_recursiveGen = _out1256;
-                    _2883_recOwned = _out1257;
-                    _2884_recErased = _out1258;
-                    _2885_recIdents = _out1259;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2882_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2883_recOwned;
-                    isErased = _2884_recErased;
-                    readIdents = _2885_recIdents;
-                  }
-                } else if (_source90.is_Primitive) {
-                  DAST._IPrimitive _2886___mcc_h1055 = _source90.dtor_Primitive_a0;
-                  DAST._IPrimitive _source92 = _2886___mcc_h1055;
-                  if (_source92.is_Int) {
-                    {
-                      Dafny.ISequence<Dafny.Rune> _2887_rhsType;
-                      Dafny.ISequence<Dafny.Rune> _out1260;
-                      _out1260 = DCOMP.COMP.GenType(_1556_fromTpe, true, false);
-                      _2887_rhsType = _out1260;
-                      Dafny.ISequence<Dafny.Rune> _2888_recursiveGen;
-                      bool _2889___v58;
-                      bool _2890___v59;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2891_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out1261;
-                      bool _out1262;
-                      bool _out1263;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1264;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, true, out _out1261, out _out1262, out _out1263, out _out1264);
-                      _2888_recursiveGen = _out1261;
-                      _2889___v58 = _out1262;
-                      _2890___v59 = _out1263;
-                      _2891_recIdents = _out1264;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::BigInt::from("), _2888_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as u32)"));
-                      isOwned = true;
-                      isErased = true;
-                      readIdents = _2891_recIdents;
-                    }
-                  } else if (_source92.is_Real) {
-                    {
-                      Dafny.ISequence<Dafny.Rune> _2892_recursiveGen;
-                      bool _2893_recOwned;
-                      bool _2894_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2895_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out1265;
-                      bool _out1266;
-                      bool _out1267;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1268;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1265, out _out1266, out _out1267, out _out1268);
-                      _2892_recursiveGen = _out1265;
-                      _2893_recOwned = _out1266;
-                      _2894_recErased = _out1267;
-                      _2895_recIdents = _out1268;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2892_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                      isOwned = _2893_recOwned;
-                      isErased = _2894_recErased;
-                      readIdents = _2895_recIdents;
-                    }
-                  } else if (_source92.is_String) {
-                    {
-                      Dafny.ISequence<Dafny.Rune> _2896_recursiveGen;
-                      bool _2897_recOwned;
-                      bool _2898_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2899_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out1269;
-                      bool _out1270;
-                      bool _out1271;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1272;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1269, out _out1270, out _out1271, out _out1272);
-                      _2896_recursiveGen = _out1269;
-                      _2897_recOwned = _out1270;
-                      _2898_recErased = _out1271;
-                      _2899_recIdents = _out1272;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2896_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                      isOwned = _2897_recOwned;
-                      isErased = _2898_recErased;
-                      readIdents = _2899_recIdents;
-                    }
-                  } else if (_source92.is_Bool) {
-                    {
-                      Dafny.ISequence<Dafny.Rune> _2900_recursiveGen;
-                      bool _2901_recOwned;
-                      bool _2902_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2903_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out1273;
-                      bool _out1274;
-                      bool _out1275;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1276;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1273, out _out1274, out _out1275, out _out1276);
-                      _2900_recursiveGen = _out1273;
-                      _2901_recOwned = _out1274;
-                      _2902_recErased = _out1275;
-                      _2903_recIdents = _out1276;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2900_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                      isOwned = _2901_recOwned;
-                      isErased = _2902_recErased;
-                      readIdents = _2903_recIdents;
-                    }
-                  } else {
-                    {
-                      Dafny.ISequence<Dafny.Rune> _2904_recursiveGen;
-                      bool _2905_recOwned;
-                      bool _2906_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2907_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out1277;
-                      bool _out1278;
-                      bool _out1279;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1280;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1277, out _out1278, out _out1279, out _out1280);
-                      _2904_recursiveGen = _out1277;
-                      _2905_recOwned = _out1278;
-                      _2906_recErased = _out1279;
-                      _2907_recIdents = _out1280;
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2904_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                      isOwned = _2905_recOwned;
-                      isErased = _2906_recErased;
-                      readIdents = _2907_recIdents;
-                    }
-                  }
-                } else if (_source90.is_Passthrough) {
-                  Dafny.ISequence<Dafny.Rune> _2908___mcc_h1057 = _source90.dtor_Passthrough_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2909_recursiveGen;
-                    bool _2910_recOwned;
-                    bool _2911_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2912_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1281;
-                    bool _out1282;
-                    bool _out1283;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1284;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1281, out _out1282, out _out1283, out _out1284);
-                    _2909_recursiveGen = _out1281;
-                    _2910_recOwned = _out1282;
-                    _2911_recErased = _out1283;
-                    _2912_recIdents = _out1284;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2909_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2910_recOwned;
-                    isErased = _2911_recErased;
-                    readIdents = _2912_recIdents;
-                  }
-                } else {
-                  Dafny.ISequence<Dafny.Rune> _2913___mcc_h1059 = _source90.dtor_TypeArg_a0;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2914_recursiveGen;
-                    bool _2915_recOwned;
-                    bool _2916_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2917_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1285;
-                    bool _out1286;
-                    bool _out1287;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1288;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1285, out _out1286, out _out1287, out _out1288);
-                    _2914_recursiveGen = _out1285;
-                    _2915_recOwned = _out1286;
-                    _2916_recErased = _out1287;
-                    _2917_recIdents = _out1288;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2914_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2915_recOwned;
-                    isErased = _2916_recErased;
-                    readIdents = _2917_recIdents;
-                  }
-                }
-              }
-            } else if (_source55.is_Passthrough) {
-              Dafny.ISequence<Dafny.Rune> _2918___mcc_h1061 = _source55.dtor_Passthrough_a0;
-              DAST._IType _source93 = _1563___mcc_h306;
-              if (_source93.is_Path) {
-                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2919___mcc_h1065 = _source93.dtor_Path_a0;
-                Dafny.ISequence<DAST._IType> _2920___mcc_h1066 = _source93.dtor_typeArgs;
-                DAST._IResolvedType _2921___mcc_h1067 = _source93.dtor_resolved;
-                DAST._IResolvedType _source94 = _2921___mcc_h1067;
-                if (_source94.is_Datatype) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2922___mcc_h1071 = _source94.dtor_path;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2923_recursiveGen;
-                    bool _2924_recOwned;
-                    bool _2925_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2926_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1289;
-                    bool _out1290;
-                    bool _out1291;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1292;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1289, out _out1290, out _out1291, out _out1292);
-                    _2923_recursiveGen = _out1289;
-                    _2924_recOwned = _out1290;
-                    _2925_recErased = _out1291;
-                    _2926_recIdents = _out1292;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2923_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2924_recOwned;
-                    isErased = _2925_recErased;
-                    readIdents = _2926_recIdents;
-                  }
-                } else if (_source94.is_Trait) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2927___mcc_h1073 = _source94.dtor_path;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2928_recursiveGen;
-                    bool _2929_recOwned;
-                    bool _2930_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2931_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1293;
-                    bool _out1294;
-                    bool _out1295;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1296;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1293, out _out1294, out _out1295, out _out1296);
-                    _2928_recursiveGen = _out1293;
-                    _2929_recOwned = _out1294;
-                    _2930_recErased = _out1295;
-                    _2931_recIdents = _out1296;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2928_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2929_recOwned;
-                    isErased = _2930_recErased;
-                    readIdents = _2931_recIdents;
-                  }
-                } else {
-                  DAST._IType _2932___mcc_h1075 = _source94.dtor_Newtype_a0;
-                  DAST._IType _2933_b = _2932___mcc_h1075;
-                  {
-                    if (object.Equals(_1556_fromTpe, _2933_b)) {
-                      Dafny.ISequence<Dafny.Rune> _2934_recursiveGen;
-                      bool _2935_recOwned;
-                      bool _2936_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2937_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out1297;
-                      bool _out1298;
-                      bool _out1299;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1300;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1297, out _out1298, out _out1299, out _out1300);
-                      _2934_recursiveGen = _out1297;
-                      _2935_recOwned = _out1298;
-                      _2936_recErased = _out1299;
-                      _2937_recIdents = _out1300;
-                      Dafny.ISequence<Dafny.Rune> _2938_rhsType;
-                      Dafny.ISequence<Dafny.Rune> _out1301;
-                      _out1301 = DCOMP.COMP.GenType(_1555_toTpe, true, false);
-                      _2938_rhsType = _out1301;
-                      Dafny.ISequence<Dafny.Rune> _2939_uneraseFn;
-                      _2939_uneraseFn = ((_2935_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase")));
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _2938_rhsType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ::dafny_runtime::DafnyUnerasable<_>>::")), _2939_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _2934_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                      isOwned = _2935_recOwned;
-                      isErased = false;
-                      readIdents = _2937_recIdents;
-                    } else {
-                      Dafny.ISequence<Dafny.Rune> _out1302;
-                      bool _out1303;
-                      bool _out1304;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1305;
-                      DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _2933_b), _2933_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out1302, out _out1303, out _out1304, out _out1305);
-                      s = _out1302;
-                      isOwned = _out1303;
-                      isErased = _out1304;
-                      readIdents = _out1305;
-                    }
-                  }
-                }
-              } else if (_source93.is_Nullable) {
-                DAST._IType _2940___mcc_h1077 = _source93.dtor_Nullable_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2941_recursiveGen;
-                  bool _2942_recOwned;
-                  bool _2943_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2944_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out1306;
-                  bool _out1307;
-                  bool _out1308;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1309;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1306, out _out1307, out _out1308, out _out1309);
-                  _2941_recursiveGen = _out1306;
-                  _2942_recOwned = _out1307;
-                  _2943_recErased = _out1308;
-                  _2944_recIdents = _out1309;
-                  if (!(_2942_recOwned)) {
-                    _2941_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_2941_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".clone()"));
-                  }
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Some("), _2941_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                  isOwned = true;
-                  isErased = _2943_recErased;
-                  readIdents = _2944_recIdents;
-                }
-              } else if (_source93.is_Tuple) {
-                Dafny.ISequence<DAST._IType> _2945___mcc_h1079 = _source93.dtor_Tuple_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2946_recursiveGen;
-                  bool _2947_recOwned;
-                  bool _2948_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2949_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out1310;
-                  bool _out1311;
-                  bool _out1312;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1313;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1310, out _out1311, out _out1312, out _out1313);
-                  _2946_recursiveGen = _out1310;
-                  _2947_recOwned = _out1311;
-                  _2948_recErased = _out1312;
-                  _2949_recIdents = _out1313;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2946_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2947_recOwned;
-                  isErased = _2948_recErased;
-                  readIdents = _2949_recIdents;
-                }
-              } else if (_source93.is_Array) {
-                DAST._IType _2950___mcc_h1081 = _source93.dtor_element;
-                BigInteger _2951___mcc_h1082 = _source93.dtor_dims;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2952_recursiveGen;
-                  bool _2953_recOwned;
-                  bool _2954_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2955_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out1314;
-                  bool _out1315;
-                  bool _out1316;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1317;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1314, out _out1315, out _out1316, out _out1317);
-                  _2952_recursiveGen = _out1314;
-                  _2953_recOwned = _out1315;
-                  _2954_recErased = _out1316;
-                  _2955_recIdents = _out1317;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2952_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2953_recOwned;
-                  isErased = _2954_recErased;
-                  readIdents = _2955_recIdents;
-                }
-              } else if (_source93.is_Seq) {
-                DAST._IType _2956___mcc_h1085 = _source93.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2957_recursiveGen;
-                  bool _2958_recOwned;
-                  bool _2959_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2960_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out1318;
-                  bool _out1319;
-                  bool _out1320;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1321;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1318, out _out1319, out _out1320, out _out1321);
-                  _2957_recursiveGen = _out1318;
-                  _2958_recOwned = _out1319;
-                  _2959_recErased = _out1320;
-                  _2960_recIdents = _out1321;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2957_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2958_recOwned;
-                  isErased = _2959_recErased;
-                  readIdents = _2960_recIdents;
-                }
-              } else if (_source93.is_Set) {
-                DAST._IType _2961___mcc_h1087 = _source93.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2962_recursiveGen;
-                  bool _2963_recOwned;
-                  bool _2964_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2965_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out1322;
-                  bool _out1323;
-                  bool _out1324;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1325;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1322, out _out1323, out _out1324, out _out1325);
-                  _2962_recursiveGen = _out1322;
-                  _2963_recOwned = _out1323;
-                  _2964_recErased = _out1324;
-                  _2965_recIdents = _out1325;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2962_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2963_recOwned;
-                  isErased = _2964_recErased;
-                  readIdents = _2965_recIdents;
-                }
-              } else if (_source93.is_Multiset) {
-                DAST._IType _2966___mcc_h1089 = _source93.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2967_recursiveGen;
-                  bool _2968_recOwned;
-                  bool _2969_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2970_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out1326;
-                  bool _out1327;
-                  bool _out1328;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1329;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1326, out _out1327, out _out1328, out _out1329);
-                  _2967_recursiveGen = _out1326;
-                  _2968_recOwned = _out1327;
-                  _2969_recErased = _out1328;
-                  _2970_recIdents = _out1329;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2967_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2968_recOwned;
-                  isErased = _2969_recErased;
-                  readIdents = _2970_recIdents;
-                }
-              } else if (_source93.is_Map) {
-                DAST._IType _2971___mcc_h1091 = _source93.dtor_key;
-                DAST._IType _2972___mcc_h1092 = _source93.dtor_value;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2973_recursiveGen;
-                  bool _2974_recOwned;
-                  bool _2975_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2976_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out1330;
-                  bool _out1331;
-                  bool _out1332;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1333;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1330, out _out1331, out _out1332, out _out1333);
-                  _2973_recursiveGen = _out1330;
-                  _2974_recOwned = _out1331;
-                  _2975_recErased = _out1332;
-                  _2976_recIdents = _out1333;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2973_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2974_recOwned;
-                  isErased = _2975_recErased;
-                  readIdents = _2976_recIdents;
-                }
-              } else if (_source93.is_Arrow) {
-                Dafny.ISequence<DAST._IType> _2977___mcc_h1095 = _source93.dtor_args;
-                DAST._IType _2978___mcc_h1096 = _source93.dtor_result;
-                {
-                  Dafny.ISequence<Dafny.Rune> _2979_recursiveGen;
-                  bool _2980_recOwned;
-                  bool _2981_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2982_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out1334;
-                  bool _out1335;
-                  bool _out1336;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1337;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1334, out _out1335, out _out1336, out _out1337);
-                  _2979_recursiveGen = _out1334;
-                  _2980_recOwned = _out1335;
-                  _2981_recErased = _out1336;
-                  _2982_recIdents = _out1337;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2979_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _2980_recOwned;
-                  isErased = _2981_recErased;
-                  readIdents = _2982_recIdents;
-                }
-              } else if (_source93.is_Primitive) {
-                DAST._IPrimitive _2983___mcc_h1099 = _source93.dtor_Primitive_a0;
-                DAST._IPrimitive _source95 = _2983___mcc_h1099;
-                if (_source95.is_Int) {
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2984_rhsType;
-                    Dafny.ISequence<Dafny.Rune> _out1338;
-                    _out1338 = DCOMP.COMP.GenType(_1556_fromTpe, true, false);
-                    _2984_rhsType = _out1338;
-                    Dafny.ISequence<Dafny.Rune> _2985_recursiveGen;
-                    bool _2986___v54;
-                    bool _2987___v55;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2988_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1339;
-                    bool _out1340;
-                    bool _out1341;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1342;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, true, out _out1339, out _out1340, out _out1341, out _out1342);
-                    _2985_recursiveGen = _out1339;
-                    _2986___v54 = _out1340;
-                    _2987___v55 = _out1341;
-                    _2988_recIdents = _out1342;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::BigInt::from("), _2985_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                    isOwned = true;
-                    isErased = true;
-                    readIdents = _2988_recIdents;
-                  }
-                } else if (_source95.is_Real) {
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2989_recursiveGen;
-                    bool _2990_recOwned;
-                    bool _2991_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2992_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1343;
-                    bool _out1344;
-                    bool _out1345;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1346;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1343, out _out1344, out _out1345, out _out1346);
-                    _2989_recursiveGen = _out1343;
-                    _2990_recOwned = _out1344;
-                    _2991_recErased = _out1345;
-                    _2992_recIdents = _out1346;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2989_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2990_recOwned;
-                    isErased = _2991_recErased;
-                    readIdents = _2992_recIdents;
-                  }
-                } else if (_source95.is_String) {
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2993_recursiveGen;
-                    bool _2994_recOwned;
-                    bool _2995_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2996_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1347;
-                    bool _out1348;
-                    bool _out1349;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1350;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1347, out _out1348, out _out1349, out _out1350);
-                    _2993_recursiveGen = _out1347;
-                    _2994_recOwned = _out1348;
-                    _2995_recErased = _out1349;
-                    _2996_recIdents = _out1350;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2993_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2994_recOwned;
-                    isErased = _2995_recErased;
-                    readIdents = _2996_recIdents;
-                  }
-                } else if (_source95.is_Bool) {
-                  {
-                    Dafny.ISequence<Dafny.Rune> _2997_recursiveGen;
-                    bool _2998_recOwned;
-                    bool _2999_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3000_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1351;
-                    bool _out1352;
-                    bool _out1353;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1354;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1351, out _out1352, out _out1353, out _out1354);
-                    _2997_recursiveGen = _out1351;
-                    _2998_recOwned = _out1352;
-                    _2999_recErased = _out1353;
-                    _3000_recIdents = _out1354;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2997_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _2998_recOwned;
-                    isErased = _2999_recErased;
-                    readIdents = _3000_recIdents;
-                  }
-                } else {
-                  {
-                    Dafny.ISequence<Dafny.Rune> _3001_recursiveGen;
-                    bool _3002_recOwned;
-                    bool _3003_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3004_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1355;
-                    bool _out1356;
-                    bool _out1357;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1358;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1355, out _out1356, out _out1357, out _out1358);
-                    _3001_recursiveGen = _out1355;
-                    _3002_recOwned = _out1356;
-                    _3003_recErased = _out1357;
-                    _3004_recIdents = _out1358;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3001_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _3002_recOwned;
-                    isErased = _3003_recErased;
-                    readIdents = _3004_recIdents;
-                  }
-                }
-              } else if (_source93.is_Passthrough) {
-                Dafny.ISequence<Dafny.Rune> _3005___mcc_h1101 = _source93.dtor_Passthrough_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _3006_recursiveGen;
-                  bool _3007___v62;
-                  bool _3008___v63;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3009_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out1359;
-                  bool _out1360;
-                  bool _out1361;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1362;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, true, out _out1359, out _out1360, out _out1361, out _out1362);
-                  _3006_recursiveGen = _out1359;
-                  _3007___v62 = _out1360;
-                  _3008___v63 = _out1361;
-                  _3009_recIdents = _out1362;
-                  Dafny.ISequence<Dafny.Rune> _3010_toTpeGen;
-                  Dafny.ISequence<Dafny.Rune> _out1363;
-                  _out1363 = DCOMP.COMP.GenType(_1555_toTpe, true, false);
-                  _3010_toTpeGen = _out1363;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(("), _3006_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") as ")), _3010_toTpeGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                  isOwned = true;
-                  isErased = true;
-                  readIdents = _3009_recIdents;
-                }
-              } else {
-                Dafny.ISequence<Dafny.Rune> _3011___mcc_h1103 = _source93.dtor_TypeArg_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _3012_recursiveGen;
-                  bool _3013_recOwned;
-                  bool _3014_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3015_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out1364;
-                  bool _out1365;
-                  bool _out1366;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1367;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1364, out _out1365, out _out1366, out _out1367);
-                  _3012_recursiveGen = _out1364;
-                  _3013_recOwned = _out1365;
-                  _3014_recErased = _out1366;
-                  _3015_recIdents = _out1367;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3012_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _3013_recOwned;
-                  isErased = _3014_recErased;
-                  readIdents = _3015_recIdents;
-                }
-              }
-            } else {
-              Dafny.ISequence<Dafny.Rune> _3016___mcc_h1105 = _source55.dtor_TypeArg_a0;
-              DAST._IType _source96 = _1563___mcc_h306;
-              if (_source96.is_Path) {
-                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3017___mcc_h1109 = _source96.dtor_Path_a0;
-                Dafny.ISequence<DAST._IType> _3018___mcc_h1110 = _source96.dtor_typeArgs;
-                DAST._IResolvedType _3019___mcc_h1111 = _source96.dtor_resolved;
-                DAST._IResolvedType _source97 = _3019___mcc_h1111;
-                if (_source97.is_Datatype) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3020___mcc_h1115 = _source97.dtor_path;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _3021_recursiveGen;
-                    bool _3022_recOwned;
-                    bool _3023_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3024_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1368;
-                    bool _out1369;
-                    bool _out1370;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1371;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1368, out _out1369, out _out1370, out _out1371);
-                    _3021_recursiveGen = _out1368;
-                    _3022_recOwned = _out1369;
-                    _3023_recErased = _out1370;
-                    _3024_recIdents = _out1371;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3021_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _3022_recOwned;
-                    isErased = _3023_recErased;
-                    readIdents = _3024_recIdents;
-                  }
-                } else if (_source97.is_Trait) {
-                  Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3025___mcc_h1117 = _source97.dtor_path;
-                  {
-                    Dafny.ISequence<Dafny.Rune> _3026_recursiveGen;
-                    bool _3027_recOwned;
-                    bool _3028_recErased;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3029_recIdents;
-                    Dafny.ISequence<Dafny.Rune> _out1372;
-                    bool _out1373;
-                    bool _out1374;
-                    Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1375;
-                    DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1372, out _out1373, out _out1374, out _out1375);
-                    _3026_recursiveGen = _out1372;
-                    _3027_recOwned = _out1373;
-                    _3028_recErased = _out1374;
-                    _3029_recIdents = _out1375;
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3026_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                    isOwned = _3027_recOwned;
-                    isErased = _3028_recErased;
-                    readIdents = _3029_recIdents;
-                  }
-                } else {
-                  DAST._IType _3030___mcc_h1119 = _source97.dtor_Newtype_a0;
-                  DAST._IType _3031_b = _3030___mcc_h1119;
-                  {
-                    if (object.Equals(_1556_fromTpe, _3031_b)) {
-                      Dafny.ISequence<Dafny.Rune> _3032_recursiveGen;
-                      bool _3033_recOwned;
-                      bool _3034_recErased;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3035_recIdents;
-                      Dafny.ISequence<Dafny.Rune> _out1376;
-                      bool _out1377;
-                      bool _out1378;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1379;
-                      DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1376, out _out1377, out _out1378, out _out1379);
-                      _3032_recursiveGen = _out1376;
-                      _3033_recOwned = _out1377;
-                      _3034_recErased = _out1378;
-                      _3035_recIdents = _out1379;
-                      Dafny.ISequence<Dafny.Rune> _3036_rhsType;
-                      Dafny.ISequence<Dafny.Rune> _out1380;
-                      _out1380 = DCOMP.COMP.GenType(_1555_toTpe, true, false);
-                      _3036_rhsType = _out1380;
-                      Dafny.ISequence<Dafny.Rune> _3037_uneraseFn;
-                      _3037_uneraseFn = ((_3033_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unerase")));
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _3036_rhsType), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ::dafny_runtime::DafnyUnerasable<_>>::")), _3037_uneraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _3032_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                      isOwned = _3033_recOwned;
-                      isErased = false;
-                      readIdents = _3035_recIdents;
-                    } else {
-                      Dafny.ISequence<Dafny.Rune> _out1381;
-                      bool _out1382;
-                      bool _out1383;
-                      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1384;
-                      DCOMP.COMP.GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_1557_expr, _1556_fromTpe, _3031_b), _3031_b, _1555_toTpe), selfIdent, @params, mustOwn, out _out1381, out _out1382, out _out1383, out _out1384);
-                      s = _out1381;
-                      isOwned = _out1382;
-                      isErased = _out1383;
-                      readIdents = _out1384;
-                    }
-                  }
-                }
-              } else if (_source96.is_Nullable) {
-                DAST._IType _3038___mcc_h1121 = _source96.dtor_Nullable_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _3039_recursiveGen;
-                  bool _3040_recOwned;
-                  bool _3041_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3042_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out1385;
-                  bool _out1386;
-                  bool _out1387;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1388;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1385, out _out1386, out _out1387, out _out1388);
-                  _3039_recursiveGen = _out1385;
-                  _3040_recOwned = _out1386;
-                  _3041_recErased = _out1387;
-                  _3042_recIdents = _out1388;
-                  if (!(_3040_recOwned)) {
-                    _3039_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(_3039_recursiveGen, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".clone()"));
-                  }
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Some("), _3039_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                  isOwned = true;
-                  isErased = _3041_recErased;
-                  readIdents = _3042_recIdents;
-                }
-              } else if (_source96.is_Tuple) {
-                Dafny.ISequence<DAST._IType> _3043___mcc_h1123 = _source96.dtor_Tuple_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _3044_recursiveGen;
-                  bool _3045_recOwned;
-                  bool _3046_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3047_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out1389;
-                  bool _out1390;
-                  bool _out1391;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1392;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1389, out _out1390, out _out1391, out _out1392);
-                  _3044_recursiveGen = _out1389;
-                  _3045_recOwned = _out1390;
-                  _3046_recErased = _out1391;
-                  _3047_recIdents = _out1392;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3044_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _3045_recOwned;
-                  isErased = _3046_recErased;
-                  readIdents = _3047_recIdents;
-                }
-              } else if (_source96.is_Array) {
-                DAST._IType _3048___mcc_h1125 = _source96.dtor_element;
-                BigInteger _3049___mcc_h1126 = _source96.dtor_dims;
-                {
-                  Dafny.ISequence<Dafny.Rune> _3050_recursiveGen;
-                  bool _3051_recOwned;
-                  bool _3052_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3053_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out1393;
-                  bool _out1394;
-                  bool _out1395;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1396;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1393, out _out1394, out _out1395, out _out1396);
-                  _3050_recursiveGen = _out1393;
-                  _3051_recOwned = _out1394;
-                  _3052_recErased = _out1395;
-                  _3053_recIdents = _out1396;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3050_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _3051_recOwned;
-                  isErased = _3052_recErased;
-                  readIdents = _3053_recIdents;
-                }
-              } else if (_source96.is_Seq) {
-                DAST._IType _3054___mcc_h1129 = _source96.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _3055_recursiveGen;
-                  bool _3056_recOwned;
-                  bool _3057_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3058_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out1397;
-                  bool _out1398;
-                  bool _out1399;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1400;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1397, out _out1398, out _out1399, out _out1400);
-                  _3055_recursiveGen = _out1397;
-                  _3056_recOwned = _out1398;
-                  _3057_recErased = _out1399;
-                  _3058_recIdents = _out1400;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3055_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _3056_recOwned;
-                  isErased = _3057_recErased;
-                  readIdents = _3058_recIdents;
-                }
-              } else if (_source96.is_Set) {
-                DAST._IType _3059___mcc_h1131 = _source96.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _3060_recursiveGen;
-                  bool _3061_recOwned;
-                  bool _3062_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3063_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out1401;
-                  bool _out1402;
-                  bool _out1403;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1404;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1401, out _out1402, out _out1403, out _out1404);
-                  _3060_recursiveGen = _out1401;
-                  _3061_recOwned = _out1402;
-                  _3062_recErased = _out1403;
-                  _3063_recIdents = _out1404;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3060_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _3061_recOwned;
-                  isErased = _3062_recErased;
-                  readIdents = _3063_recIdents;
-                }
-              } else if (_source96.is_Multiset) {
-                DAST._IType _3064___mcc_h1133 = _source96.dtor_element;
-                {
-                  Dafny.ISequence<Dafny.Rune> _3065_recursiveGen;
-                  bool _3066_recOwned;
-                  bool _3067_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3068_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out1405;
-                  bool _out1406;
-                  bool _out1407;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1408;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1405, out _out1406, out _out1407, out _out1408);
-                  _3065_recursiveGen = _out1405;
-                  _3066_recOwned = _out1406;
-                  _3067_recErased = _out1407;
-                  _3068_recIdents = _out1408;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3065_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _3066_recOwned;
-                  isErased = _3067_recErased;
-                  readIdents = _3068_recIdents;
-                }
-              } else if (_source96.is_Map) {
-                DAST._IType _3069___mcc_h1135 = _source96.dtor_key;
-                DAST._IType _3070___mcc_h1136 = _source96.dtor_value;
-                {
-                  Dafny.ISequence<Dafny.Rune> _3071_recursiveGen;
-                  bool _3072_recOwned;
-                  bool _3073_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3074_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out1409;
-                  bool _out1410;
-                  bool _out1411;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1412;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1409, out _out1410, out _out1411, out _out1412);
-                  _3071_recursiveGen = _out1409;
-                  _3072_recOwned = _out1410;
-                  _3073_recErased = _out1411;
-                  _3074_recIdents = _out1412;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3071_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _3072_recOwned;
-                  isErased = _3073_recErased;
-                  readIdents = _3074_recIdents;
-                }
-              } else if (_source96.is_Arrow) {
-                Dafny.ISequence<DAST._IType> _3075___mcc_h1139 = _source96.dtor_args;
-                DAST._IType _3076___mcc_h1140 = _source96.dtor_result;
-                {
-                  Dafny.ISequence<Dafny.Rune> _3077_recursiveGen;
-                  bool _3078_recOwned;
-                  bool _3079_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3080_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out1413;
-                  bool _out1414;
-                  bool _out1415;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1416;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1413, out _out1414, out _out1415, out _out1416);
-                  _3077_recursiveGen = _out1413;
-                  _3078_recOwned = _out1414;
-                  _3079_recErased = _out1415;
-                  _3080_recIdents = _out1416;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3077_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _3078_recOwned;
-                  isErased = _3079_recErased;
-                  readIdents = _3080_recIdents;
-                }
-              } else if (_source96.is_Primitive) {
-                DAST._IPrimitive _3081___mcc_h1143 = _source96.dtor_Primitive_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _3082_recursiveGen;
-                  bool _3083_recOwned;
-                  bool _3084_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3085_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out1417;
-                  bool _out1418;
-                  bool _out1419;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1420;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1417, out _out1418, out _out1419, out _out1420);
-                  _3082_recursiveGen = _out1417;
-                  _3083_recOwned = _out1418;
-                  _3084_recErased = _out1419;
-                  _3085_recIdents = _out1420;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3082_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _3083_recOwned;
-                  isErased = _3084_recErased;
-                  readIdents = _3085_recIdents;
-                }
-              } else if (_source96.is_Passthrough) {
-                Dafny.ISequence<Dafny.Rune> _3086___mcc_h1145 = _source96.dtor_Passthrough_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _3087_recursiveGen;
-                  bool _3088_recOwned;
-                  bool _3089_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3090_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out1421;
-                  bool _out1422;
-                  bool _out1423;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1424;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1421, out _out1422, out _out1423, out _out1424);
-                  _3087_recursiveGen = _out1421;
-                  _3088_recOwned = _out1422;
-                  _3089_recErased = _out1423;
-                  _3090_recIdents = _out1424;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3087_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _3088_recOwned;
-                  isErased = _3089_recErased;
-                  readIdents = _3090_recIdents;
-                }
-              } else {
-                Dafny.ISequence<Dafny.Rune> _3091___mcc_h1147 = _source96.dtor_TypeArg_a0;
-                {
-                  Dafny.ISequence<Dafny.Rune> _3092_recursiveGen;
-                  bool _3093_recOwned;
-                  bool _3094_recErased;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3095_recIdents;
-                  Dafny.ISequence<Dafny.Rune> _out1425;
-                  bool _out1426;
-                  bool _out1427;
-                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1428;
-                  DCOMP.COMP.GenExpr(_1557_expr, selfIdent, @params, mustOwn, out _out1425, out _out1426, out _out1427, out _out1428);
-                  _3092_recursiveGen = _out1425;
-                  _3093_recOwned = _out1426;
-                  _3094_recErased = _out1427;
-                  _3095_recIdents = _out1428;
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3092_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)"));
-                  isOwned = _3093_recOwned;
-                  isErased = _3094_recErased;
-                  readIdents = _3095_recIdents;
-                }
-              }
-            }
-          }
-        }
-      } else if (_source48.is_SeqConstruct) {
-        DAST._IExpression _3096___mcc_h26 = _source48.dtor_length;
-        DAST._IExpression _3097___mcc_h27 = _source48.dtor_elem;
-        DAST._IExpression _3098_expr = _3097___mcc_h27;
-        DAST._IExpression _3099_length = _3096___mcc_h26;
-        {
-          Dafny.ISequence<Dafny.Rune> _3100_recursiveGen;
-          bool _3101___v65;
-          bool _3102_eErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3103_recIdents;
-          Dafny.ISequence<Dafny.Rune> _out1429;
-          bool _out1430;
-          bool _out1431;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1432;
-          DCOMP.COMP.GenExpr(_3098_expr, selfIdent, @params, true, out _out1429, out _out1430, out _out1431, out _out1432);
-          _3100_recursiveGen = _out1429;
-          _3101___v65 = _out1430;
-          _3102_eErased = _out1431;
-          _3103_recIdents = _out1432;
-          Dafny.ISequence<Dafny.Rune> _3104_lengthGen;
-          bool _3105___v66;
-          bool _3106_lengthErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3107_lengthIdents;
-          Dafny.ISequence<Dafny.Rune> _out1433;
-          bool _out1434;
-          bool _out1435;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1436;
-          DCOMP.COMP.GenExpr(_3099_length, selfIdent, @params, true, out _out1433, out _out1434, out _out1435, out _out1436);
-          _3104_lengthGen = _out1433;
-          _3105___v66 = _out1434;
-          _3106_lengthErased = _out1435;
-          _3107_lengthIdents = _out1436;
-          if (!(_3106_lengthErased)) {
-            _3104_lengthGen = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3104_lengthGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-          }
-          s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("{\nlet _initializer = "), _3100_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";\n::dafny_runtime::integer_range(::dafny_runtime::Zero::zero(), ")), _3104_lengthGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").map(|i| _initializer.0(&i)).collect::<Vec<_>>()\n}"));
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(_3103_recIdents, _3107_lengthIdents);
-          isOwned = true;
-          isErased = _3102_eErased;
-        }
-      } else if (_source48.is_SeqValue) {
-        Dafny.ISequence<DAST._IExpression> _3108___mcc_h28 = _source48.dtor_elements;
-        DAST._IType _3109___mcc_h29 = _source48.dtor_typ;
-        DAST._IType _3110_typ = _3109___mcc_h29;
-        Dafny.ISequence<DAST._IExpression> _3111_exprs = _3108___mcc_h28;
-        {
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-          Dafny.ISequence<Dafny.Rune> _3112_genTpe;
-          Dafny.ISequence<Dafny.Rune> _out1437;
-          _out1437 = DCOMP.COMP.GenType(_3110_typ, false, false);
-          _3112_genTpe = _out1437;
-          BigInteger _3113_i;
-          _3113_i = BigInteger.Zero;
-          s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(vec![");
-          _3113_i = BigInteger.Zero;
-          while ((_3113_i) < (new BigInteger((_3111_exprs).Count))) {
-            if ((_3113_i).Sign == 1) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-            }
-            Dafny.ISequence<Dafny.Rune> _3114_recursiveGen;
-            bool _3115___v67;
-            bool _3116_isErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3117_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1438;
-            bool _out1439;
-            bool _out1440;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1441;
-            DCOMP.COMP.GenExpr((_3111_exprs).Select(_3113_i), selfIdent, @params, true, out _out1438, out _out1439, out _out1440, out _out1441);
-            _3114_recursiveGen = _out1438;
-            _3115___v67 = _out1439;
-            _3116_isErased = _out1440;
-            _3117_recIdents = _out1441;
-            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _3117_recIdents);
-            if (_3116_isErased) {
-              _3114_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyUnerasable::<_>::unerase_owned("), _3114_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            }
-            s = Dafny.Sequence<Dafny.Rune>.Concat(s, _3114_recursiveGen);
-            _3113_i = (_3113_i) + (BigInteger.One);
-          }
-          s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("] as Vec<")), _3112_genTpe), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">)"));
-          isOwned = true;
-          isErased = false;
-        }
-      } else if (_source48.is_SetValue) {
-        Dafny.ISequence<DAST._IExpression> _3118___mcc_h30 = _source48.dtor_elements;
-        Dafny.ISequence<DAST._IExpression> _3119_exprs = _3118___mcc_h30;
-        {
-          Dafny.ISequence<_System._ITuple2<Dafny.ISequence<Dafny.Rune>, bool>> _3120_generatedValues;
-          _3120_generatedValues = Dafny.Sequence<_System._ITuple2<Dafny.ISequence<Dafny.Rune>, bool>>.FromElements();
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-          BigInteger _3121_i;
-          _3121_i = BigInteger.Zero;
-          bool _3122_allErased;
-          _3122_allErased = true;
-          while ((_3121_i) < (new BigInteger((_3119_exprs).Count))) {
-            Dafny.ISequence<Dafny.Rune> _3123_recursiveGen;
-            bool _3124___v68;
-            bool _3125_isErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3126_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1442;
-            bool _out1443;
-            bool _out1444;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1445;
-            DCOMP.COMP.GenExpr((_3119_exprs).Select(_3121_i), selfIdent, @params, true, out _out1442, out _out1443, out _out1444, out _out1445);
-            _3123_recursiveGen = _out1442;
-            _3124___v68 = _out1443;
-            _3125_isErased = _out1444;
-            _3126_recIdents = _out1445;
-            _3122_allErased = (_3122_allErased) && (_3125_isErased);
-            _3120_generatedValues = Dafny.Sequence<_System._ITuple2<Dafny.ISequence<Dafny.Rune>, bool>>.Concat(_3120_generatedValues, Dafny.Sequence<_System._ITuple2<Dafny.ISequence<Dafny.Rune>, bool>>.FromElements(_System.Tuple2<Dafny.ISequence<Dafny.Rune>, bool>.create(_3123_recursiveGen, _3125_isErased)));
-            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _3126_recIdents);
-            _3121_i = (_3121_i) + (BigInteger.One);
-          }
-          s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("vec![");
-          _3121_i = BigInteger.Zero;
-          while ((_3121_i) < (new BigInteger((_3120_generatedValues).Count))) {
-            if ((_3121_i).Sign == 1) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-            }
-            Dafny.ISequence<Dafny.Rune> _3127_gen;
-            _3127_gen = ((_3120_generatedValues).Select(_3121_i)).dtor__0;
-            if ((((_3120_generatedValues).Select(_3121_i)).dtor__1) && (!(_3122_allErased))) {
-              _3127_gen = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyUnerasable::<_>::unerase_owned("), _3127_gen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            }
-            s = Dafny.Sequence<Dafny.Rune>.Concat(s, _3127_gen);
-            _3121_i = (_3121_i) + (BigInteger.One);
-          }
-          s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("].into_iter().collect::<std::collections::HashSet<_>>()"));
-          isOwned = true;
-          isErased = _3122_allErased;
-        }
-      } else if (_source48.is_MapValue) {
-        Dafny.ISequence<_System._ITuple2<DAST._IExpression, DAST._IExpression>> _3128___mcc_h31 = _source48.dtor_mapElems;
-        Dafny.ISequence<_System._ITuple2<DAST._IExpression, DAST._IExpression>> _3129_mapElems = _3128___mcc_h31;
-        {
-          Dafny.ISequence<_System._ITuple4<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>, bool, bool>> _3130_generatedValues;
-          _3130_generatedValues = Dafny.Sequence<_System._ITuple4<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>, bool, bool>>.FromElements();
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-          BigInteger _3131_i;
-          _3131_i = BigInteger.Zero;
-          bool _3132_allErased;
-          _3132_allErased = true;
-          while ((_3131_i) < (new BigInteger((_3129_mapElems).Count))) {
-            Dafny.ISequence<Dafny.Rune> _3133_recursiveGenKey;
-            bool _3134___v69;
-            bool _3135_isErasedKey;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3136_recIdentsKey;
-            Dafny.ISequence<Dafny.Rune> _out1446;
-            bool _out1447;
-            bool _out1448;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1449;
-            DCOMP.COMP.GenExpr(((_3129_mapElems).Select(_3131_i)).dtor__0, selfIdent, @params, true, out _out1446, out _out1447, out _out1448, out _out1449);
-            _3133_recursiveGenKey = _out1446;
-            _3134___v69 = _out1447;
-            _3135_isErasedKey = _out1448;
-            _3136_recIdentsKey = _out1449;
-            Dafny.ISequence<Dafny.Rune> _3137_recursiveGenValue;
-            bool _3138___v70;
-            bool _3139_isErasedValue;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3140_recIdentsValue;
-            Dafny.ISequence<Dafny.Rune> _out1450;
-            bool _out1451;
-            bool _out1452;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1453;
-            DCOMP.COMP.GenExpr(((_3129_mapElems).Select(_3131_i)).dtor__1, selfIdent, @params, true, out _out1450, out _out1451, out _out1452, out _out1453);
-            _3137_recursiveGenValue = _out1450;
-            _3138___v70 = _out1451;
-            _3139_isErasedValue = _out1452;
-            _3140_recIdentsValue = _out1453;
-            _3132_allErased = ((_3132_allErased) && (_3135_isErasedKey)) && (_3139_isErasedValue);
-            _3130_generatedValues = Dafny.Sequence<_System._ITuple4<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>, bool, bool>>.Concat(_3130_generatedValues, Dafny.Sequence<_System._ITuple4<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>, bool, bool>>.FromElements(_System.Tuple4<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>, bool, bool>.create(_3133_recursiveGenKey, _3137_recursiveGenValue, _3135_isErasedKey, _3139_isErasedValue)));
-            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _3136_recIdentsKey), _3140_recIdentsValue);
-            _3131_i = (_3131_i) + (BigInteger.One);
-          }
-          s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("vec![");
-          _3131_i = BigInteger.Zero;
-          while ((_3131_i) < (new BigInteger((_3130_generatedValues).Count))) {
-            if ((_3131_i).Sign == 1) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-            }
-            Dafny.ISequence<Dafny.Rune> _3141_genKey;
-            _3141_genKey = ((_3130_generatedValues).Select(_3131_i)).dtor__0;
-            Dafny.ISequence<Dafny.Rune> _3142_genValue;
-            _3142_genValue = ((_3130_generatedValues).Select(_3131_i)).dtor__1;
-            if ((((_3130_generatedValues).Select(_3131_i)).dtor__2) && (!(_3132_allErased))) {
-              _3141_genKey = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyUnerasable::<_>::unerase_owned("), _3141_genKey), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            }
-            if ((((_3130_generatedValues).Select(_3131_i)).dtor__3) && (!(_3132_allErased))) {
-              _3142_genValue = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyUnerasable::<_>::unerase_owned("), _3142_genValue), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            }
-            s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _3141_genKey), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3142_genValue), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            _3131_i = (_3131_i) + (BigInteger.One);
-          }
-          s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("].into_iter().collect::<std::collections::HashMap<_, _>>()"));
-          isOwned = true;
-          isErased = _3132_allErased;
-        }
-      } else if (_source48.is_This) {
-        {
-          Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _source98 = selfIdent;
-          if (_source98.is_None) {
-            {
-              s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("panic!(\"this outside of a method\")");
-              isOwned = true;
-              readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-              isErased = true;
-            }
-          } else {
-            Dafny.ISequence<Dafny.Rune> _3143___mcc_h1149 = _source98.dtor_value;
-            Dafny.ISequence<Dafny.Rune> _3144_id = _3143___mcc_h1149;
-            {
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(_3144_id, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".clone()"));
-                isOwned = true;
-              } else {
-                if ((_3144_id).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("self"))) {
-                  s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("self");
-                } else {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), _3144_id);
-                }
-                isOwned = false;
-              }
-              readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements(_3144_id);
-              isErased = false;
-            }
-          }
-        }
-      } else if (_source48.is_Ite) {
-        DAST._IExpression _3145___mcc_h32 = _source48.dtor_cond;
-        DAST._IExpression _3146___mcc_h33 = _source48.dtor_thn;
-        DAST._IExpression _3147___mcc_h34 = _source48.dtor_els;
-        DAST._IExpression _3148_f = _3147___mcc_h34;
-        DAST._IExpression _3149_t = _3146___mcc_h33;
-        DAST._IExpression _3150_cond = _3145___mcc_h32;
-        {
-          Dafny.ISequence<Dafny.Rune> _3151_condString;
-          bool _3152___v71;
-          bool _3153_condErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3154_recIdentsCond;
-          Dafny.ISequence<Dafny.Rune> _out1454;
-          bool _out1455;
-          bool _out1456;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1457;
-          DCOMP.COMP.GenExpr(_3150_cond, selfIdent, @params, true, out _out1454, out _out1455, out _out1456, out _out1457);
-          _3151_condString = _out1454;
-          _3152___v71 = _out1455;
-          _3153_condErased = _out1456;
-          _3154_recIdentsCond = _out1457;
-          if (!(_3153_condErased)) {
-            _3151_condString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3151_condString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-          }
-          Dafny.ISequence<Dafny.Rune> _3155___v72;
-          bool _3156_tHasToBeOwned;
-          bool _3157___v73;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3158___v74;
-          Dafny.ISequence<Dafny.Rune> _out1458;
-          bool _out1459;
-          bool _out1460;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1461;
-          DCOMP.COMP.GenExpr(_3149_t, selfIdent, @params, mustOwn, out _out1458, out _out1459, out _out1460, out _out1461);
-          _3155___v72 = _out1458;
-          _3156_tHasToBeOwned = _out1459;
-          _3157___v73 = _out1460;
-          _3158___v74 = _out1461;
-          Dafny.ISequence<Dafny.Rune> _3159_fString;
-          bool _3160_fOwned;
-          bool _3161_fErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3162_recIdentsF;
-          Dafny.ISequence<Dafny.Rune> _out1462;
-          bool _out1463;
-          bool _out1464;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1465;
-          DCOMP.COMP.GenExpr(_3148_f, selfIdent, @params, _3156_tHasToBeOwned, out _out1462, out _out1463, out _out1464, out _out1465);
-          _3159_fString = _out1462;
-          _3160_fOwned = _out1463;
-          _3161_fErased = _out1464;
-          _3162_recIdentsF = _out1465;
-          Dafny.ISequence<Dafny.Rune> _3163_tString;
-          bool _3164___v75;
-          bool _3165_tErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3166_recIdentsT;
-          Dafny.ISequence<Dafny.Rune> _out1466;
-          bool _out1467;
-          bool _out1468;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1469;
-          DCOMP.COMP.GenExpr(_3149_t, selfIdent, @params, _3160_fOwned, out _out1466, out _out1467, out _out1468, out _out1469);
-          _3163_tString = _out1466;
-          _3164___v75 = _out1467;
-          _3165_tErased = _out1468;
-          _3166_recIdentsT = _out1469;
-          if ((!(_3161_fErased)) || (!(_3165_tErased))) {
-            if (_3161_fErased) {
-              _3159_fString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3159_fString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            }
-            if (_3165_tErased) {
-              _3163_tString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3163_tString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            }
-          }
-          s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(if "), _3151_condString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {\n")), _3163_tString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n} else {\n")), _3159_fString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n})"));
-          isOwned = _3160_fOwned;
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(_3154_recIdentsCond, _3166_recIdentsT), _3162_recIdentsF);
-          isErased = (_3161_fErased) || (_3165_tErased);
-        }
-      } else if (_source48.is_UnOp) {
-        DAST._IUnaryOp _3167___mcc_h35 = _source48.dtor_unOp;
-        DAST._IExpression _3168___mcc_h36 = _source48.dtor_expr;
-        DAST._IUnaryOp _source99 = _3167___mcc_h35;
-        if (_source99.is_Not) {
-          DAST._IExpression _3169_e = _3168___mcc_h36;
-          {
-            Dafny.ISequence<Dafny.Rune> _3170_recursiveGen;
-            bool _3171___v76;
-            bool _3172_recErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3173_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1470;
-            bool _out1471;
-            bool _out1472;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1473;
-            DCOMP.COMP.GenExpr(_3169_e, selfIdent, @params, true, out _out1470, out _out1471, out _out1472, out _out1473);
-            _3170_recursiveGen = _out1470;
-            _3171___v76 = _out1471;
-            _3172_recErased = _out1472;
-            _3173_recIdents = _out1473;
-            if (!(_3172_recErased)) {
-              _3170_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3170_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            }
-            s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!("), _3170_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            isOwned = true;
-            readIdents = _3173_recIdents;
-            isErased = true;
-          }
-        } else if (_source99.is_BitwiseNot) {
-          DAST._IExpression _3174_e = _3168___mcc_h36;
-          {
-            Dafny.ISequence<Dafny.Rune> _3175_recursiveGen;
-            bool _3176___v77;
-            bool _3177_recErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3178_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1474;
-            bool _out1475;
-            bool _out1476;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1477;
-            DCOMP.COMP.GenExpr(_3174_e, selfIdent, @params, true, out _out1474, out _out1475, out _out1476, out _out1477);
-            _3175_recursiveGen = _out1474;
-            _3176___v77 = _out1475;
-            _3177_recErased = _out1476;
-            _3178_recIdents = _out1477;
-            if (!(_3177_recErased)) {
-              _3175_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3175_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            }
-            s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("~("), _3175_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            isOwned = true;
-            readIdents = _3178_recIdents;
-            isErased = true;
-          }
-        } else {
-          DAST._IExpression _3179_e = _3168___mcc_h36;
-          {
-            Dafny.ISequence<Dafny.Rune> _3180_recursiveGen;
-            bool _3181_recOwned;
-            bool _3182_recErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3183_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1478;
-            bool _out1479;
-            bool _out1480;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1481;
-            DCOMP.COMP.GenExpr(_3179_e, selfIdent, @params, false, out _out1478, out _out1479, out _out1480, out _out1481);
-            _3180_recursiveGen = _out1478;
-            _3181_recOwned = _out1479;
-            _3182_recErased = _out1480;
-            _3183_recIdents = _out1481;
-            if (!(_3182_recErased)) {
-              Dafny.ISequence<Dafny.Rune> _3184_eraseFn;
-              _3184_eraseFn = ((_3181_recOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase_owned")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("erase")));
-              _3180_recursiveGen = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::"), _3184_eraseFn), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _3180_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            }
-            s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::BigInt::from(("), _3180_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").len())"));
-            isOwned = true;
-            readIdents = _3183_recIdents;
-            isErased = true;
-          }
-        }
-      } else if (_source48.is_BinOp) {
-        DAST._IBinOp _3185___mcc_h37 = _source48.dtor_op;
-        DAST._IExpression _3186___mcc_h38 = _source48.dtor_left;
-        DAST._IExpression _3187___mcc_h39 = _source48.dtor_right;
-        DAST._IExpression _3188_r = _3187___mcc_h39;
-        DAST._IExpression _3189_l = _3186___mcc_h38;
-        DAST._IBinOp _3190_op = _3185___mcc_h37;
-        {
-          Dafny.ISequence<Dafny.Rune> _3191_left;
-          bool _3192___v78;
-          bool _3193_leftErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3194_recIdentsL;
-          Dafny.ISequence<Dafny.Rune> _out1482;
-          bool _out1483;
-          bool _out1484;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1485;
-          DCOMP.COMP.GenExpr(_3189_l, selfIdent, @params, true, out _out1482, out _out1483, out _out1484, out _out1485);
-          _3191_left = _out1482;
-          _3192___v78 = _out1483;
-          _3193_leftErased = _out1484;
-          _3194_recIdentsL = _out1485;
-          Dafny.ISequence<Dafny.Rune> _3195_right;
-          bool _3196___v79;
-          bool _3197_rightErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3198_recIdentsR;
-          Dafny.ISequence<Dafny.Rune> _out1486;
-          bool _out1487;
-          bool _out1488;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1489;
-          DCOMP.COMP.GenExpr(_3188_r, selfIdent, @params, true, out _out1486, out _out1487, out _out1488, out _out1489);
-          _3195_right = _out1486;
-          _3196___v79 = _out1487;
-          _3197_rightErased = _out1488;
-          _3198_recIdentsR = _out1489;
-          DAST._IBinOp _source100 = _3190_op;
-          if (_source100.is_Eq) {
-            bool _3199___mcc_h1150 = _source100.dtor_referential;
-            bool _3200___mcc_h1151 = _source100.dtor_nullable;
-            {
-              if (!(_3193_leftErased)) {
-                _3191_left = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-              if (!(_3197_rightErased)) {
-                _3195_right = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-              DAST._IBinOp _source101 = _3190_op;
-              if (_source101.is_Eq) {
-                bool _3201___mcc_h1160 = _source101.dtor_referential;
-                bool _3202___mcc_h1161 = _source101.dtor_nullable;
-                bool _3203_nullable = _3202___mcc_h1161;
-                bool _3204_referential = _3201___mcc_h1160;
-                {
-                  if (_3204_referential) {
-                    if (_3203_nullable) {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::nullable_referential_equality("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                    } else {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::ptr_eq(&("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("), &(")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("))"));
-                    }
-                  } else {
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3191_left, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" == ")), _3195_right);
-                  }
-                }
-              } else if (_source101.is_Neq) {
-                bool _3205___mcc_h1162 = _source101.dtor_referential;
-                bool _3206___mcc_h1163 = _source101.dtor_nullable;
-                bool _3207_nullable = _3206___mcc_h1163;
-                bool _3208_referential = _3205___mcc_h1162;
-                {
-                  if (_3208_referential) {
-                    if (_3207_nullable) {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!::dafny_runtime::nullable_referential_equality("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                    } else {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!::std::rc::Rc::ptr_eq(&("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("), &(")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("))"));
-                    }
-                  } else {
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3191_left, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" != ")), _3195_right);
-                  }
-                }
-              } else if (_source101.is_Div) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") / (")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else if (_source101.is_EuclidianDiv) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_division("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else if (_source101.is_Mod) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") % (")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else if (_source101.is_EuclidianMod) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_modulo("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else {
-                Dafny.ISequence<Dafny.Rune> _3209___mcc_h1164 = _source101.dtor_Passthrough_a0;
-                Dafny.ISequence<Dafny.Rune> _3210_op = _3209___mcc_h1164;
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" ")), _3210_op), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              }
-            }
-          } else if (_source100.is_Neq) {
-            bool _3211___mcc_h1154 = _source100.dtor_referential;
-            bool _3212___mcc_h1155 = _source100.dtor_nullable;
-            {
-              if (!(_3193_leftErased)) {
-                _3191_left = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-              if (!(_3197_rightErased)) {
-                _3195_right = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-              DAST._IBinOp _source102 = _3190_op;
-              if (_source102.is_Eq) {
-                bool _3213___mcc_h1165 = _source102.dtor_referential;
-                bool _3214___mcc_h1166 = _source102.dtor_nullable;
-                bool _3215_nullable = _3214___mcc_h1166;
-                bool _3216_referential = _3213___mcc_h1165;
-                {
-                  if (_3216_referential) {
-                    if (_3215_nullable) {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::nullable_referential_equality("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                    } else {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::ptr_eq(&("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("), &(")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("))"));
-                    }
-                  } else {
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3191_left, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" == ")), _3195_right);
-                  }
-                }
-              } else if (_source102.is_Neq) {
-                bool _3217___mcc_h1167 = _source102.dtor_referential;
-                bool _3218___mcc_h1168 = _source102.dtor_nullable;
-                bool _3219_nullable = _3218___mcc_h1168;
-                bool _3220_referential = _3217___mcc_h1167;
-                {
-                  if (_3220_referential) {
-                    if (_3219_nullable) {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!::dafny_runtime::nullable_referential_equality("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                    } else {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!::std::rc::Rc::ptr_eq(&("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("), &(")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("))"));
-                    }
-                  } else {
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3191_left, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" != ")), _3195_right);
-                  }
-                }
-              } else if (_source102.is_Div) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") / (")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else if (_source102.is_EuclidianDiv) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_division("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else if (_source102.is_Mod) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") % (")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else if (_source102.is_EuclidianMod) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_modulo("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else {
-                Dafny.ISequence<Dafny.Rune> _3221___mcc_h1169 = _source102.dtor_Passthrough_a0;
-                Dafny.ISequence<Dafny.Rune> _3222_op = _3221___mcc_h1169;
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" ")), _3222_op), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              }
-            }
-          } else if (_source100.is_Div) {
-            {
-              if (!(_3193_leftErased)) {
-                _3191_left = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-              if (!(_3197_rightErased)) {
-                _3195_right = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-              DAST._IBinOp _source103 = _3190_op;
-              if (_source103.is_Eq) {
-                bool _3223___mcc_h1170 = _source103.dtor_referential;
-                bool _3224___mcc_h1171 = _source103.dtor_nullable;
-                bool _3225_nullable = _3224___mcc_h1171;
-                bool _3226_referential = _3223___mcc_h1170;
-                {
-                  if (_3226_referential) {
-                    if (_3225_nullable) {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::nullable_referential_equality("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                    } else {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::ptr_eq(&("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("), &(")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("))"));
-                    }
-                  } else {
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3191_left, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" == ")), _3195_right);
-                  }
-                }
-              } else if (_source103.is_Neq) {
-                bool _3227___mcc_h1172 = _source103.dtor_referential;
-                bool _3228___mcc_h1173 = _source103.dtor_nullable;
-                bool _3229_nullable = _3228___mcc_h1173;
-                bool _3230_referential = _3227___mcc_h1172;
-                {
-                  if (_3230_referential) {
-                    if (_3229_nullable) {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!::dafny_runtime::nullable_referential_equality("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                    } else {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!::std::rc::Rc::ptr_eq(&("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("), &(")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("))"));
-                    }
-                  } else {
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3191_left, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" != ")), _3195_right);
-                  }
-                }
-              } else if (_source103.is_Div) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") / (")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else if (_source103.is_EuclidianDiv) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_division("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else if (_source103.is_Mod) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") % (")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else if (_source103.is_EuclidianMod) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_modulo("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else {
-                Dafny.ISequence<Dafny.Rune> _3231___mcc_h1174 = _source103.dtor_Passthrough_a0;
-                Dafny.ISequence<Dafny.Rune> _3232_op = _3231___mcc_h1174;
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" ")), _3232_op), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              }
-            }
-          } else if (_source100.is_EuclidianDiv) {
-            {
-              if (!(_3193_leftErased)) {
-                _3191_left = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-              if (!(_3197_rightErased)) {
-                _3195_right = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-              DAST._IBinOp _source104 = _3190_op;
-              if (_source104.is_Eq) {
-                bool _3233___mcc_h1175 = _source104.dtor_referential;
-                bool _3234___mcc_h1176 = _source104.dtor_nullable;
-                bool _3235_nullable = _3234___mcc_h1176;
-                bool _3236_referential = _3233___mcc_h1175;
-                {
-                  if (_3236_referential) {
-                    if (_3235_nullable) {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::nullable_referential_equality("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                    } else {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::ptr_eq(&("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("), &(")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("))"));
-                    }
-                  } else {
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3191_left, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" == ")), _3195_right);
-                  }
-                }
-              } else if (_source104.is_Neq) {
-                bool _3237___mcc_h1177 = _source104.dtor_referential;
-                bool _3238___mcc_h1178 = _source104.dtor_nullable;
-                bool _3239_nullable = _3238___mcc_h1178;
-                bool _3240_referential = _3237___mcc_h1177;
-                {
-                  if (_3240_referential) {
-                    if (_3239_nullable) {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!::dafny_runtime::nullable_referential_equality("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                    } else {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!::std::rc::Rc::ptr_eq(&("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("), &(")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("))"));
-                    }
-                  } else {
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3191_left, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" != ")), _3195_right);
-                  }
-                }
-              } else if (_source104.is_Div) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") / (")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else if (_source104.is_EuclidianDiv) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_division("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else if (_source104.is_Mod) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") % (")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else if (_source104.is_EuclidianMod) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_modulo("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else {
-                Dafny.ISequence<Dafny.Rune> _3241___mcc_h1179 = _source104.dtor_Passthrough_a0;
-                Dafny.ISequence<Dafny.Rune> _3242_op = _3241___mcc_h1179;
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" ")), _3242_op), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              }
-            }
-          } else if (_source100.is_Mod) {
-            {
-              if (!(_3193_leftErased)) {
-                _3191_left = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-              if (!(_3197_rightErased)) {
-                _3195_right = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-              DAST._IBinOp _source105 = _3190_op;
-              if (_source105.is_Eq) {
-                bool _3243___mcc_h1180 = _source105.dtor_referential;
-                bool _3244___mcc_h1181 = _source105.dtor_nullable;
-                bool _3245_nullable = _3244___mcc_h1181;
-                bool _3246_referential = _3243___mcc_h1180;
-                {
-                  if (_3246_referential) {
-                    if (_3245_nullable) {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::nullable_referential_equality("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                    } else {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::ptr_eq(&("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("), &(")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("))"));
-                    }
-                  } else {
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3191_left, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" == ")), _3195_right);
-                  }
-                }
-              } else if (_source105.is_Neq) {
-                bool _3247___mcc_h1182 = _source105.dtor_referential;
-                bool _3248___mcc_h1183 = _source105.dtor_nullable;
-                bool _3249_nullable = _3248___mcc_h1183;
-                bool _3250_referential = _3247___mcc_h1182;
-                {
-                  if (_3250_referential) {
-                    if (_3249_nullable) {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!::dafny_runtime::nullable_referential_equality("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                    } else {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!::std::rc::Rc::ptr_eq(&("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("), &(")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("))"));
-                    }
-                  } else {
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3191_left, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" != ")), _3195_right);
-                  }
-                }
-              } else if (_source105.is_Div) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") / (")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else if (_source105.is_EuclidianDiv) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_division("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else if (_source105.is_Mod) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") % (")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else if (_source105.is_EuclidianMod) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_modulo("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else {
-                Dafny.ISequence<Dafny.Rune> _3251___mcc_h1184 = _source105.dtor_Passthrough_a0;
-                Dafny.ISequence<Dafny.Rune> _3252_op = _3251___mcc_h1184;
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" ")), _3252_op), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              }
-            }
-          } else if (_source100.is_EuclidianMod) {
-            {
-              if (!(_3193_leftErased)) {
-                _3191_left = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-              if (!(_3197_rightErased)) {
-                _3195_right = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-              DAST._IBinOp _source106 = _3190_op;
-              if (_source106.is_Eq) {
-                bool _3253___mcc_h1185 = _source106.dtor_referential;
-                bool _3254___mcc_h1186 = _source106.dtor_nullable;
-                bool _3255_nullable = _3254___mcc_h1186;
-                bool _3256_referential = _3253___mcc_h1185;
-                {
-                  if (_3256_referential) {
-                    if (_3255_nullable) {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::nullable_referential_equality("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                    } else {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::ptr_eq(&("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("), &(")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("))"));
-                    }
-                  } else {
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3191_left, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" == ")), _3195_right);
-                  }
-                }
-              } else if (_source106.is_Neq) {
-                bool _3257___mcc_h1187 = _source106.dtor_referential;
-                bool _3258___mcc_h1188 = _source106.dtor_nullable;
-                bool _3259_nullable = _3258___mcc_h1188;
-                bool _3260_referential = _3257___mcc_h1187;
-                {
-                  if (_3260_referential) {
-                    if (_3259_nullable) {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!::dafny_runtime::nullable_referential_equality("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                    } else {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!::std::rc::Rc::ptr_eq(&("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("), &(")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("))"));
-                    }
-                  } else {
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3191_left, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" != ")), _3195_right);
-                  }
-                }
-              } else if (_source106.is_Div) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") / (")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else if (_source106.is_EuclidianDiv) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_division("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else if (_source106.is_Mod) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") % (")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else if (_source106.is_EuclidianMod) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_modulo("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else {
-                Dafny.ISequence<Dafny.Rune> _3261___mcc_h1189 = _source106.dtor_Passthrough_a0;
-                Dafny.ISequence<Dafny.Rune> _3262_op = _3261___mcc_h1189;
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" ")), _3262_op), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              }
-            }
-          } else if (_source100.is_Implies) {
-            {
-              if (!(_3193_leftErased)) {
-                _3191_left = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-              if (!(_3197_rightErased)) {
-                _3195_right = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") || ")), _3195_right);
-            }
-          } else if (_source100.is_In) {
-            {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3195_right, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".contains(&")), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            }
-          } else if (_source100.is_NotIn) {
-            {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!("), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".contains(&")), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("))"));
-            }
-          } else if (_source100.is_SetDifference) {
-            {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3191_left, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".difference(&")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").cloned().collect::<::std::collections::HashSet<_>>()"));
-            }
-          } else if (_source100.is_Concat) {
-            {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("["), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("].concat()"));
-            }
-          } else {
-            Dafny.ISequence<Dafny.Rune> _3263___mcc_h1158 = _source100.dtor_Passthrough_a0;
-            {
-              if (!(_3193_leftErased)) {
-                _3191_left = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-              if (!(_3197_rightErased)) {
-                _3195_right = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-              DAST._IBinOp _source107 = _3190_op;
-              if (_source107.is_Eq) {
-                bool _3264___mcc_h1190 = _source107.dtor_referential;
-                bool _3265___mcc_h1191 = _source107.dtor_nullable;
-                bool _3266_nullable = _3265___mcc_h1191;
-                bool _3267_referential = _3264___mcc_h1190;
-                {
-                  if (_3267_referential) {
-                    if (_3266_nullable) {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::nullable_referential_equality("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                    } else {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::ptr_eq(&("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("), &(")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("))"));
-                    }
-                  } else {
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3191_left, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" == ")), _3195_right);
-                  }
-                }
-              } else if (_source107.is_Neq) {
-                bool _3268___mcc_h1192 = _source107.dtor_referential;
-                bool _3269___mcc_h1193 = _source107.dtor_nullable;
-                bool _3270_nullable = _3269___mcc_h1193;
-                bool _3271_referential = _3268___mcc_h1192;
-                {
-                  if (_3271_referential) {
-                    if (_3270_nullable) {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!::dafny_runtime::nullable_referential_equality("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                    } else {
-                      s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!::std::rc::Rc::ptr_eq(&("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("), &(")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("))"));
-                    }
-                  } else {
-                    s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3191_left, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" != ")), _3195_right);
-                  }
-                }
-              } else if (_source107.is_Div) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") / (")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else if (_source107.is_EuclidianDiv) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_division("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else if (_source107.is_Mod) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") % (")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else if (_source107.is_EuclidianMod) {
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_modulo("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              } else {
-                Dafny.ISequence<Dafny.Rune> _3272___mcc_h1194 = _source107.dtor_Passthrough_a0;
-                Dafny.ISequence<Dafny.Rune> _3273_op = _3272___mcc_h1194;
-                {
-                  s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3191_left), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" ")), _3273_op), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" ")), _3195_right), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-                }
-              }
-            }
-          }
-          isOwned = true;
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(_3194_recIdentsL, _3198_recIdentsR);
-          isErased = true;
-        }
-      } else if (_source48.is_ArrayLen) {
-        DAST._IExpression _3274___mcc_h40 = _source48.dtor_expr;
-        BigInteger _3275___mcc_h41 = _source48.dtor_dim;
-        BigInteger _3276_dim = _3275___mcc_h41;
-        DAST._IExpression _3277_expr = _3274___mcc_h40;
-        {
-          Dafny.ISequence<Dafny.Rune> _3278_recursiveGen;
-          bool _3279___v81;
-          bool _3280_recErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3281_recIdents;
-          Dafny.ISequence<Dafny.Rune> _out1490;
-          bool _out1491;
-          bool _out1492;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1493;
-          DCOMP.COMP.GenExpr(_3277_expr, selfIdent, @params, true, out _out1490, out _out1491, out _out1492, out _out1493);
-          _3278_recursiveGen = _out1490;
-          _3279___v81 = _out1491;
-          _3280_recErased = _out1492;
-          _3281_recIdents = _out1493;
-          if ((_3276_dim).Sign == 0) {
-            s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::BigInt::from(("), _3278_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").borrow().len())"));
-          } else {
-            s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::BigInt::from(m.borrow().len())");
-            BigInteger _3282_i;
-            _3282_i = BigInteger.One;
-            while ((_3282_i) < (_3276_dim)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("m.borrow().get(0).map(|m| "), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").unwrap_or(::dafny_runtime::BigInt::from(0))"));
-              _3282_i = (_3282_i) + (BigInteger.One);
-            }
-            s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3278_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow().get(0).map(|m| ")), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").unwrap_or(::dafny_runtime::BigInt::from(0))"));
-          }
-          isOwned = true;
-          readIdents = _3281_recIdents;
-          isErased = true;
-        }
-      } else if (_source48.is_Select) {
-        DAST._IExpression _3283___mcc_h42 = _source48.dtor_expr;
-        Dafny.ISequence<Dafny.Rune> _3284___mcc_h43 = _source48.dtor_field;
-        bool _3285___mcc_h44 = _source48.dtor_isConstant;
-        bool _3286___mcc_h45 = _source48.dtor_onDatatype;
-        DAST._IExpression _source108 = _3283___mcc_h42;
-        if (_source108.is_Literal) {
-          DAST._ILiteral _3287___mcc_h46 = _source108.dtor_Literal_a0;
-          bool _3288_isDatatype = _3286___mcc_h45;
-          bool _3289_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3290_field = _3284___mcc_h43;
-          DAST._IExpression _3291_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3292_onString;
-            bool _3293_onOwned;
-            bool _3294_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3295_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1494;
-            bool _out1495;
-            bool _out1496;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1497;
-            DCOMP.COMP.GenExpr(_3291_on, selfIdent, @params, false, out _out1494, out _out1495, out _out1496, out _out1497);
-            _3292_onString = _out1494;
-            _3293_onOwned = _out1495;
-            _3294_onErased = _out1496;
-            _3295_recIdents = _out1497;
-            if ((_3288_isDatatype) || (_3289_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3292_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3290_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3289_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3292_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3290_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3295_recIdents;
-          }
-        } else if (_source108.is_Ident) {
-          Dafny.ISequence<Dafny.Rune> _3296___mcc_h48 = _source108.dtor_Ident_a0;
-          bool _3297_isDatatype = _3286___mcc_h45;
-          bool _3298_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3299_field = _3284___mcc_h43;
-          DAST._IExpression _3300_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3301_onString;
-            bool _3302_onOwned;
-            bool _3303_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3304_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1498;
-            bool _out1499;
-            bool _out1500;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1501;
-            DCOMP.COMP.GenExpr(_3300_on, selfIdent, @params, false, out _out1498, out _out1499, out _out1500, out _out1501);
-            _3301_onString = _out1498;
-            _3302_onOwned = _out1499;
-            _3303_onErased = _out1500;
-            _3304_recIdents = _out1501;
-            if ((_3297_isDatatype) || (_3298_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3301_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3299_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3298_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3301_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3299_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3304_recIdents;
-          }
-        } else if (_source108.is_Companion) {
-          Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3305___mcc_h50 = _source108.dtor_Companion_a0;
-          bool _3306_isDatatype = _3286___mcc_h45;
-          bool _3307_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3308_field = _3284___mcc_h43;
-          Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3309_c = _3305___mcc_h50;
-          {
-            Dafny.ISequence<Dafny.Rune> _3310_onString;
-            bool _3311_onOwned;
-            bool _3312_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3313_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1502;
-            bool _out1503;
-            bool _out1504;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1505;
-            DCOMP.COMP.GenExpr(DAST.Expression.create_Companion(_3309_c), selfIdent, @params, false, out _out1502, out _out1503, out _out1504, out _out1505);
-            _3310_onString = _out1502;
-            _3311_onOwned = _out1503;
-            _3312_onErased = _out1504;
-            _3313_recIdents = _out1505;
-            s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3310_onString, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::")), DCOMP.__default.escapeIdent(_3308_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-            isOwned = true;
-            isErased = false;
-            readIdents = _3313_recIdents;
-          }
-        } else if (_source108.is_Tuple) {
-          Dafny.ISequence<DAST._IExpression> _3314___mcc_h52 = _source108.dtor_Tuple_a0;
-          bool _3315_isDatatype = _3286___mcc_h45;
-          bool _3316_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3317_field = _3284___mcc_h43;
-          DAST._IExpression _3318_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3319_onString;
-            bool _3320_onOwned;
-            bool _3321_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3322_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1506;
-            bool _out1507;
-            bool _out1508;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1509;
-            DCOMP.COMP.GenExpr(_3318_on, selfIdent, @params, false, out _out1506, out _out1507, out _out1508, out _out1509);
-            _3319_onString = _out1506;
-            _3320_onOwned = _out1507;
-            _3321_onErased = _out1508;
-            _3322_recIdents = _out1509;
-            if ((_3315_isDatatype) || (_3316_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3319_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3317_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3316_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3319_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3317_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3322_recIdents;
-          }
-        } else if (_source108.is_New) {
-          Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3323___mcc_h54 = _source108.dtor_path;
-          Dafny.ISequence<DAST._IType> _3324___mcc_h55 = _source108.dtor_typeArgs;
-          Dafny.ISequence<DAST._IExpression> _3325___mcc_h56 = _source108.dtor_args;
-          bool _3326_isDatatype = _3286___mcc_h45;
-          bool _3327_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3328_field = _3284___mcc_h43;
-          DAST._IExpression _3329_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3330_onString;
-            bool _3331_onOwned;
-            bool _3332_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3333_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1510;
-            bool _out1511;
-            bool _out1512;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1513;
-            DCOMP.COMP.GenExpr(_3329_on, selfIdent, @params, false, out _out1510, out _out1511, out _out1512, out _out1513);
-            _3330_onString = _out1510;
-            _3331_onOwned = _out1511;
-            _3332_onErased = _out1512;
-            _3333_recIdents = _out1513;
-            if ((_3326_isDatatype) || (_3327_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3330_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3328_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3327_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3330_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3328_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3333_recIdents;
-          }
-        } else if (_source108.is_NewArray) {
-          Dafny.ISequence<DAST._IExpression> _3334___mcc_h60 = _source108.dtor_dims;
-          DAST._IType _3335___mcc_h61 = _source108.dtor_typ;
-          bool _3336_isDatatype = _3286___mcc_h45;
-          bool _3337_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3338_field = _3284___mcc_h43;
-          DAST._IExpression _3339_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3340_onString;
-            bool _3341_onOwned;
-            bool _3342_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3343_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1514;
-            bool _out1515;
-            bool _out1516;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1517;
-            DCOMP.COMP.GenExpr(_3339_on, selfIdent, @params, false, out _out1514, out _out1515, out _out1516, out _out1517);
-            _3340_onString = _out1514;
-            _3341_onOwned = _out1515;
-            _3342_onErased = _out1516;
-            _3343_recIdents = _out1517;
-            if ((_3336_isDatatype) || (_3337_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3340_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3338_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3337_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3340_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3338_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3343_recIdents;
-          }
-        } else if (_source108.is_DatatypeValue) {
-          Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3344___mcc_h64 = _source108.dtor_path;
-          Dafny.ISequence<DAST._IType> _3345___mcc_h65 = _source108.dtor_typeArgs;
-          Dafny.ISequence<Dafny.Rune> _3346___mcc_h66 = _source108.dtor_variant;
-          bool _3347___mcc_h67 = _source108.dtor_isCo;
-          Dafny.ISequence<_System._ITuple2<Dafny.ISequence<Dafny.Rune>, DAST._IExpression>> _3348___mcc_h68 = _source108.dtor_contents;
-          bool _3349_isDatatype = _3286___mcc_h45;
-          bool _3350_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3351_field = _3284___mcc_h43;
-          DAST._IExpression _3352_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3353_onString;
-            bool _3354_onOwned;
-            bool _3355_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3356_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1518;
-            bool _out1519;
-            bool _out1520;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1521;
-            DCOMP.COMP.GenExpr(_3352_on, selfIdent, @params, false, out _out1518, out _out1519, out _out1520, out _out1521);
-            _3353_onString = _out1518;
-            _3354_onOwned = _out1519;
-            _3355_onErased = _out1520;
-            _3356_recIdents = _out1521;
-            if ((_3349_isDatatype) || (_3350_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3353_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3351_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3350_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3353_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3351_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3356_recIdents;
-          }
-        } else if (_source108.is_Convert) {
-          DAST._IExpression _3357___mcc_h74 = _source108.dtor_value;
-          DAST._IType _3358___mcc_h75 = _source108.dtor_from;
-          DAST._IType _3359___mcc_h76 = _source108.dtor_typ;
-          bool _3360_isDatatype = _3286___mcc_h45;
-          bool _3361_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3362_field = _3284___mcc_h43;
-          DAST._IExpression _3363_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3364_onString;
-            bool _3365_onOwned;
-            bool _3366_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3367_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1522;
-            bool _out1523;
-            bool _out1524;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1525;
-            DCOMP.COMP.GenExpr(_3363_on, selfIdent, @params, false, out _out1522, out _out1523, out _out1524, out _out1525);
-            _3364_onString = _out1522;
-            _3365_onOwned = _out1523;
-            _3366_onErased = _out1524;
-            _3367_recIdents = _out1525;
-            if ((_3360_isDatatype) || (_3361_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3364_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3362_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3361_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3364_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3362_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3367_recIdents;
-          }
-        } else if (_source108.is_SeqConstruct) {
-          DAST._IExpression _3368___mcc_h80 = _source108.dtor_length;
-          DAST._IExpression _3369___mcc_h81 = _source108.dtor_elem;
-          bool _3370_isDatatype = _3286___mcc_h45;
-          bool _3371_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3372_field = _3284___mcc_h43;
-          DAST._IExpression _3373_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3374_onString;
-            bool _3375_onOwned;
-            bool _3376_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3377_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1526;
-            bool _out1527;
-            bool _out1528;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1529;
-            DCOMP.COMP.GenExpr(_3373_on, selfIdent, @params, false, out _out1526, out _out1527, out _out1528, out _out1529);
-            _3374_onString = _out1526;
-            _3375_onOwned = _out1527;
-            _3376_onErased = _out1528;
-            _3377_recIdents = _out1529;
-            if ((_3370_isDatatype) || (_3371_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3374_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3372_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3371_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3374_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3372_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3377_recIdents;
-          }
-        } else if (_source108.is_SeqValue) {
-          Dafny.ISequence<DAST._IExpression> _3378___mcc_h84 = _source108.dtor_elements;
-          DAST._IType _3379___mcc_h85 = _source108.dtor_typ;
-          bool _3380_isDatatype = _3286___mcc_h45;
-          bool _3381_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3382_field = _3284___mcc_h43;
-          DAST._IExpression _3383_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3384_onString;
-            bool _3385_onOwned;
-            bool _3386_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3387_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1530;
-            bool _out1531;
-            bool _out1532;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1533;
-            DCOMP.COMP.GenExpr(_3383_on, selfIdent, @params, false, out _out1530, out _out1531, out _out1532, out _out1533);
-            _3384_onString = _out1530;
-            _3385_onOwned = _out1531;
-            _3386_onErased = _out1532;
-            _3387_recIdents = _out1533;
-            if ((_3380_isDatatype) || (_3381_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3384_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3382_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3381_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3384_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3382_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3387_recIdents;
-          }
-        } else if (_source108.is_SetValue) {
-          Dafny.ISequence<DAST._IExpression> _3388___mcc_h88 = _source108.dtor_elements;
-          bool _3389_isDatatype = _3286___mcc_h45;
-          bool _3390_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3391_field = _3284___mcc_h43;
-          DAST._IExpression _3392_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3393_onString;
-            bool _3394_onOwned;
-            bool _3395_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3396_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1534;
-            bool _out1535;
-            bool _out1536;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1537;
-            DCOMP.COMP.GenExpr(_3392_on, selfIdent, @params, false, out _out1534, out _out1535, out _out1536, out _out1537);
-            _3393_onString = _out1534;
-            _3394_onOwned = _out1535;
-            _3395_onErased = _out1536;
-            _3396_recIdents = _out1537;
-            if ((_3389_isDatatype) || (_3390_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3393_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3391_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3390_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3393_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3391_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3396_recIdents;
-          }
-        } else if (_source108.is_MapValue) {
-          Dafny.ISequence<_System._ITuple2<DAST._IExpression, DAST._IExpression>> _3397___mcc_h90 = _source108.dtor_mapElems;
-          bool _3398_isDatatype = _3286___mcc_h45;
-          bool _3399_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3400_field = _3284___mcc_h43;
-          DAST._IExpression _3401_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3402_onString;
-            bool _3403_onOwned;
-            bool _3404_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3405_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1538;
-            bool _out1539;
-            bool _out1540;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1541;
-            DCOMP.COMP.GenExpr(_3401_on, selfIdent, @params, false, out _out1538, out _out1539, out _out1540, out _out1541);
-            _3402_onString = _out1538;
-            _3403_onOwned = _out1539;
-            _3404_onErased = _out1540;
-            _3405_recIdents = _out1541;
-            if ((_3398_isDatatype) || (_3399_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3402_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3400_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3399_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3402_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3400_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3405_recIdents;
-          }
-        } else if (_source108.is_This) {
-          bool _3406_isDatatype = _3286___mcc_h45;
-          bool _3407_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3408_field = _3284___mcc_h43;
-          DAST._IExpression _3409_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3410_onString;
-            bool _3411_onOwned;
-            bool _3412_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3413_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1542;
-            bool _out1543;
-            bool _out1544;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1545;
-            DCOMP.COMP.GenExpr(_3409_on, selfIdent, @params, false, out _out1542, out _out1543, out _out1544, out _out1545);
-            _3410_onString = _out1542;
-            _3411_onOwned = _out1543;
-            _3412_onErased = _out1544;
-            _3413_recIdents = _out1545;
-            if ((_3406_isDatatype) || (_3407_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3410_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3408_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3407_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3410_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3408_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3413_recIdents;
-          }
-        } else if (_source108.is_Ite) {
-          DAST._IExpression _3414___mcc_h92 = _source108.dtor_cond;
-          DAST._IExpression _3415___mcc_h93 = _source108.dtor_thn;
-          DAST._IExpression _3416___mcc_h94 = _source108.dtor_els;
-          bool _3417_isDatatype = _3286___mcc_h45;
-          bool _3418_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3419_field = _3284___mcc_h43;
-          DAST._IExpression _3420_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3421_onString;
-            bool _3422_onOwned;
-            bool _3423_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3424_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1546;
-            bool _out1547;
-            bool _out1548;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1549;
-            DCOMP.COMP.GenExpr(_3420_on, selfIdent, @params, false, out _out1546, out _out1547, out _out1548, out _out1549);
-            _3421_onString = _out1546;
-            _3422_onOwned = _out1547;
-            _3423_onErased = _out1548;
-            _3424_recIdents = _out1549;
-            if ((_3417_isDatatype) || (_3418_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3421_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3419_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3418_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3421_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3419_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3424_recIdents;
-          }
-        } else if (_source108.is_UnOp) {
-          DAST._IUnaryOp _3425___mcc_h98 = _source108.dtor_unOp;
-          DAST._IExpression _3426___mcc_h99 = _source108.dtor_expr;
-          bool _3427_isDatatype = _3286___mcc_h45;
-          bool _3428_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3429_field = _3284___mcc_h43;
-          DAST._IExpression _3430_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3431_onString;
-            bool _3432_onOwned;
-            bool _3433_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3434_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1550;
-            bool _out1551;
-            bool _out1552;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1553;
-            DCOMP.COMP.GenExpr(_3430_on, selfIdent, @params, false, out _out1550, out _out1551, out _out1552, out _out1553);
-            _3431_onString = _out1550;
-            _3432_onOwned = _out1551;
-            _3433_onErased = _out1552;
-            _3434_recIdents = _out1553;
-            if ((_3427_isDatatype) || (_3428_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3431_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3429_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3428_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3431_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3429_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3434_recIdents;
-          }
-        } else if (_source108.is_BinOp) {
-          DAST._IBinOp _3435___mcc_h102 = _source108.dtor_op;
-          DAST._IExpression _3436___mcc_h103 = _source108.dtor_left;
-          DAST._IExpression _3437___mcc_h104 = _source108.dtor_right;
-          bool _3438_isDatatype = _3286___mcc_h45;
-          bool _3439_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3440_field = _3284___mcc_h43;
-          DAST._IExpression _3441_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3442_onString;
-            bool _3443_onOwned;
-            bool _3444_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3445_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1554;
-            bool _out1555;
-            bool _out1556;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1557;
-            DCOMP.COMP.GenExpr(_3441_on, selfIdent, @params, false, out _out1554, out _out1555, out _out1556, out _out1557);
-            _3442_onString = _out1554;
-            _3443_onOwned = _out1555;
-            _3444_onErased = _out1556;
-            _3445_recIdents = _out1557;
-            if ((_3438_isDatatype) || (_3439_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3442_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3440_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3439_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3442_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3440_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3445_recIdents;
-          }
-        } else if (_source108.is_ArrayLen) {
-          DAST._IExpression _3446___mcc_h108 = _source108.dtor_expr;
-          BigInteger _3447___mcc_h109 = _source108.dtor_dim;
-          bool _3448_isDatatype = _3286___mcc_h45;
-          bool _3449_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3450_field = _3284___mcc_h43;
-          DAST._IExpression _3451_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3452_onString;
-            bool _3453_onOwned;
-            bool _3454_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3455_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1558;
-            bool _out1559;
-            bool _out1560;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1561;
-            DCOMP.COMP.GenExpr(_3451_on, selfIdent, @params, false, out _out1558, out _out1559, out _out1560, out _out1561);
-            _3452_onString = _out1558;
-            _3453_onOwned = _out1559;
-            _3454_onErased = _out1560;
-            _3455_recIdents = _out1561;
-            if ((_3448_isDatatype) || (_3449_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3452_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3450_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3449_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3452_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3450_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3455_recIdents;
-          }
-        } else if (_source108.is_Select) {
-          DAST._IExpression _3456___mcc_h112 = _source108.dtor_expr;
-          Dafny.ISequence<Dafny.Rune> _3457___mcc_h113 = _source108.dtor_field;
-          bool _3458___mcc_h114 = _source108.dtor_isConstant;
-          bool _3459___mcc_h115 = _source108.dtor_onDatatype;
-          bool _3460_isDatatype = _3286___mcc_h45;
-          bool _3461_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3462_field = _3284___mcc_h43;
-          DAST._IExpression _3463_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3464_onString;
-            bool _3465_onOwned;
-            bool _3466_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3467_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1562;
-            bool _out1563;
-            bool _out1564;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1565;
-            DCOMP.COMP.GenExpr(_3463_on, selfIdent, @params, false, out _out1562, out _out1563, out _out1564, out _out1565);
-            _3464_onString = _out1562;
-            _3465_onOwned = _out1563;
-            _3466_onErased = _out1564;
-            _3467_recIdents = _out1565;
-            if ((_3460_isDatatype) || (_3461_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3464_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3462_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3461_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3464_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3462_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3467_recIdents;
-          }
-        } else if (_source108.is_SelectFn) {
-          DAST._IExpression _3468___mcc_h120 = _source108.dtor_expr;
-          Dafny.ISequence<Dafny.Rune> _3469___mcc_h121 = _source108.dtor_field;
-          bool _3470___mcc_h122 = _source108.dtor_onDatatype;
-          bool _3471___mcc_h123 = _source108.dtor_isStatic;
-          BigInteger _3472___mcc_h124 = _source108.dtor_arity;
-          bool _3473_isDatatype = _3286___mcc_h45;
-          bool _3474_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3475_field = _3284___mcc_h43;
-          DAST._IExpression _3476_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3477_onString;
-            bool _3478_onOwned;
-            bool _3479_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3480_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1566;
-            bool _out1567;
-            bool _out1568;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1569;
-            DCOMP.COMP.GenExpr(_3476_on, selfIdent, @params, false, out _out1566, out _out1567, out _out1568, out _out1569);
-            _3477_onString = _out1566;
-            _3478_onOwned = _out1567;
-            _3479_onErased = _out1568;
-            _3480_recIdents = _out1569;
-            if ((_3473_isDatatype) || (_3474_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3477_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3475_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3474_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3477_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3475_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3480_recIdents;
-          }
-        } else if (_source108.is_Index) {
-          DAST._IExpression _3481___mcc_h130 = _source108.dtor_expr;
-          DAST._ICollKind _3482___mcc_h131 = _source108.dtor_collKind;
-          Dafny.ISequence<DAST._IExpression> _3483___mcc_h132 = _source108.dtor_indices;
-          bool _3484_isDatatype = _3286___mcc_h45;
-          bool _3485_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3486_field = _3284___mcc_h43;
-          DAST._IExpression _3487_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3488_onString;
-            bool _3489_onOwned;
-            bool _3490_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3491_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1570;
-            bool _out1571;
-            bool _out1572;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1573;
-            DCOMP.COMP.GenExpr(_3487_on, selfIdent, @params, false, out _out1570, out _out1571, out _out1572, out _out1573);
-            _3488_onString = _out1570;
-            _3489_onOwned = _out1571;
-            _3490_onErased = _out1572;
-            _3491_recIdents = _out1573;
-            if ((_3484_isDatatype) || (_3485_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3488_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3486_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3485_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3488_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3486_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3491_recIdents;
-          }
-        } else if (_source108.is_IndexRange) {
-          DAST._IExpression _3492___mcc_h136 = _source108.dtor_expr;
-          bool _3493___mcc_h137 = _source108.dtor_isArray;
-          Std.Wrappers._IOption<DAST._IExpression> _3494___mcc_h138 = _source108.dtor_low;
-          Std.Wrappers._IOption<DAST._IExpression> _3495___mcc_h139 = _source108.dtor_high;
-          bool _3496_isDatatype = _3286___mcc_h45;
-          bool _3497_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3498_field = _3284___mcc_h43;
-          DAST._IExpression _3499_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3500_onString;
-            bool _3501_onOwned;
-            bool _3502_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3503_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1574;
-            bool _out1575;
-            bool _out1576;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1577;
-            DCOMP.COMP.GenExpr(_3499_on, selfIdent, @params, false, out _out1574, out _out1575, out _out1576, out _out1577);
-            _3500_onString = _out1574;
-            _3501_onOwned = _out1575;
-            _3502_onErased = _out1576;
-            _3503_recIdents = _out1577;
-            if ((_3496_isDatatype) || (_3497_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3500_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3498_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3497_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3500_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3498_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3503_recIdents;
-          }
-        } else if (_source108.is_TupleSelect) {
-          DAST._IExpression _3504___mcc_h144 = _source108.dtor_expr;
-          BigInteger _3505___mcc_h145 = _source108.dtor_index;
-          bool _3506_isDatatype = _3286___mcc_h45;
-          bool _3507_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3508_field = _3284___mcc_h43;
-          DAST._IExpression _3509_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3510_onString;
-            bool _3511_onOwned;
-            bool _3512_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3513_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1578;
-            bool _out1579;
-            bool _out1580;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1581;
-            DCOMP.COMP.GenExpr(_3509_on, selfIdent, @params, false, out _out1578, out _out1579, out _out1580, out _out1581);
-            _3510_onString = _out1578;
-            _3511_onOwned = _out1579;
-            _3512_onErased = _out1580;
-            _3513_recIdents = _out1581;
-            if ((_3506_isDatatype) || (_3507_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3510_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3508_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3507_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3510_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3508_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3513_recIdents;
-          }
-        } else if (_source108.is_Call) {
-          DAST._IExpression _3514___mcc_h148 = _source108.dtor_on;
-          Dafny.ISequence<Dafny.Rune> _3515___mcc_h149 = _source108.dtor_name;
-          Dafny.ISequence<DAST._IType> _3516___mcc_h150 = _source108.dtor_typeArgs;
-          Dafny.ISequence<DAST._IExpression> _3517___mcc_h151 = _source108.dtor_args;
-          bool _3518_isDatatype = _3286___mcc_h45;
-          bool _3519_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3520_field = _3284___mcc_h43;
-          DAST._IExpression _3521_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3522_onString;
-            bool _3523_onOwned;
-            bool _3524_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3525_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1582;
-            bool _out1583;
-            bool _out1584;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1585;
-            DCOMP.COMP.GenExpr(_3521_on, selfIdent, @params, false, out _out1582, out _out1583, out _out1584, out _out1585);
-            _3522_onString = _out1582;
-            _3523_onOwned = _out1583;
-            _3524_onErased = _out1584;
-            _3525_recIdents = _out1585;
-            if ((_3518_isDatatype) || (_3519_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3522_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3520_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3519_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3522_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3520_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3525_recIdents;
-          }
-        } else if (_source108.is_Lambda) {
-          Dafny.ISequence<DAST._IFormal> _3526___mcc_h156 = _source108.dtor_params;
-          DAST._IType _3527___mcc_h157 = _source108.dtor_retType;
-          Dafny.ISequence<DAST._IStatement> _3528___mcc_h158 = _source108.dtor_body;
-          bool _3529_isDatatype = _3286___mcc_h45;
-          bool _3530_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3531_field = _3284___mcc_h43;
-          DAST._IExpression _3532_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3533_onString;
-            bool _3534_onOwned;
-            bool _3535_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3536_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1586;
-            bool _out1587;
-            bool _out1588;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1589;
-            DCOMP.COMP.GenExpr(_3532_on, selfIdent, @params, false, out _out1586, out _out1587, out _out1588, out _out1589);
-            _3533_onString = _out1586;
-            _3534_onOwned = _out1587;
-            _3535_onErased = _out1588;
-            _3536_recIdents = _out1589;
-            if ((_3529_isDatatype) || (_3530_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3533_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3531_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3530_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3533_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3531_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3536_recIdents;
-          }
-        } else if (_source108.is_BetaRedex) {
-          Dafny.ISequence<_System._ITuple2<DAST._IFormal, DAST._IExpression>> _3537___mcc_h162 = _source108.dtor_values;
-          DAST._IType _3538___mcc_h163 = _source108.dtor_retType;
-          DAST._IExpression _3539___mcc_h164 = _source108.dtor_expr;
-          bool _3540_isDatatype = _3286___mcc_h45;
-          bool _3541_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3542_field = _3284___mcc_h43;
-          DAST._IExpression _3543_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3544_onString;
-            bool _3545_onOwned;
-            bool _3546_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3547_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1590;
-            bool _out1591;
-            bool _out1592;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1593;
-            DCOMP.COMP.GenExpr(_3543_on, selfIdent, @params, false, out _out1590, out _out1591, out _out1592, out _out1593);
-            _3544_onString = _out1590;
-            _3545_onOwned = _out1591;
-            _3546_onErased = _out1592;
-            _3547_recIdents = _out1593;
-            if ((_3540_isDatatype) || (_3541_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3544_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3542_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3541_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3544_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3542_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3547_recIdents;
-          }
-        } else if (_source108.is_IIFE) {
-          Dafny.ISequence<Dafny.Rune> _3548___mcc_h168 = _source108.dtor_name;
-          DAST._IType _3549___mcc_h169 = _source108.dtor_typ;
-          DAST._IExpression _3550___mcc_h170 = _source108.dtor_value;
-          DAST._IExpression _3551___mcc_h171 = _source108.dtor_iifeBody;
-          bool _3552_isDatatype = _3286___mcc_h45;
-          bool _3553_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3554_field = _3284___mcc_h43;
-          DAST._IExpression _3555_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3556_onString;
-            bool _3557_onOwned;
-            bool _3558_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3559_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1594;
-            bool _out1595;
-            bool _out1596;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1597;
-            DCOMP.COMP.GenExpr(_3555_on, selfIdent, @params, false, out _out1594, out _out1595, out _out1596, out _out1597);
-            _3556_onString = _out1594;
-            _3557_onOwned = _out1595;
-            _3558_onErased = _out1596;
-            _3559_recIdents = _out1597;
-            if ((_3552_isDatatype) || (_3553_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3556_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3554_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3553_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3556_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3554_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3559_recIdents;
-          }
-        } else if (_source108.is_Apply) {
-          DAST._IExpression _3560___mcc_h176 = _source108.dtor_expr;
-          Dafny.ISequence<DAST._IExpression> _3561___mcc_h177 = _source108.dtor_args;
-          bool _3562_isDatatype = _3286___mcc_h45;
-          bool _3563_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3564_field = _3284___mcc_h43;
-          DAST._IExpression _3565_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3566_onString;
-            bool _3567_onOwned;
-            bool _3568_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3569_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1598;
-            bool _out1599;
-            bool _out1600;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1601;
-            DCOMP.COMP.GenExpr(_3565_on, selfIdent, @params, false, out _out1598, out _out1599, out _out1600, out _out1601);
-            _3566_onString = _out1598;
-            _3567_onOwned = _out1599;
-            _3568_onErased = _out1600;
-            _3569_recIdents = _out1601;
-            if ((_3562_isDatatype) || (_3563_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3566_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3564_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3563_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3566_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3564_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3569_recIdents;
-          }
-        } else if (_source108.is_TypeTest) {
-          DAST._IExpression _3570___mcc_h180 = _source108.dtor_on;
-          Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3571___mcc_h181 = _source108.dtor_dType;
-          Dafny.ISequence<Dafny.Rune> _3572___mcc_h182 = _source108.dtor_variant;
-          bool _3573_isDatatype = _3286___mcc_h45;
-          bool _3574_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3575_field = _3284___mcc_h43;
-          DAST._IExpression _3576_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3577_onString;
-            bool _3578_onOwned;
-            bool _3579_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3580_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1602;
-            bool _out1603;
-            bool _out1604;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1605;
-            DCOMP.COMP.GenExpr(_3576_on, selfIdent, @params, false, out _out1602, out _out1603, out _out1604, out _out1605);
-            _3577_onString = _out1602;
-            _3578_onOwned = _out1603;
-            _3579_onErased = _out1604;
-            _3580_recIdents = _out1605;
-            if ((_3573_isDatatype) || (_3574_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3577_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3575_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3574_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3577_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3575_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3580_recIdents;
-          }
-        } else if (_source108.is_InitializationValue) {
-          DAST._IType _3581___mcc_h186 = _source108.dtor_typ;
-          bool _3582_isDatatype = _3286___mcc_h45;
-          bool _3583_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3584_field = _3284___mcc_h43;
-          DAST._IExpression _3585_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3586_onString;
-            bool _3587_onOwned;
-            bool _3588_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3589_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1606;
-            bool _out1607;
-            bool _out1608;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1609;
-            DCOMP.COMP.GenExpr(_3585_on, selfIdent, @params, false, out _out1606, out _out1607, out _out1608, out _out1609);
-            _3586_onString = _out1606;
-            _3587_onOwned = _out1607;
-            _3588_onErased = _out1608;
-            _3589_recIdents = _out1609;
-            if ((_3582_isDatatype) || (_3583_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3586_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3584_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3583_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3586_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3584_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3589_recIdents;
-          }
-        } else if (_source108.is_BoolBoundedPool) {
-          bool _3590_isDatatype = _3286___mcc_h45;
-          bool _3591_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3592_field = _3284___mcc_h43;
-          DAST._IExpression _3593_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3594_onString;
-            bool _3595_onOwned;
-            bool _3596_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3597_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1610;
-            bool _out1611;
-            bool _out1612;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1613;
-            DCOMP.COMP.GenExpr(_3593_on, selfIdent, @params, false, out _out1610, out _out1611, out _out1612, out _out1613);
-            _3594_onString = _out1610;
-            _3595_onOwned = _out1611;
-            _3596_onErased = _out1612;
-            _3597_recIdents = _out1613;
-            if ((_3590_isDatatype) || (_3591_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3594_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3592_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3591_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3594_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3592_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3597_recIdents;
-          }
-        } else if (_source108.is_SetBoundedPool) {
-          DAST._IExpression _3598___mcc_h188 = _source108.dtor_of;
-          bool _3599_isDatatype = _3286___mcc_h45;
-          bool _3600_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3601_field = _3284___mcc_h43;
-          DAST._IExpression _3602_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3603_onString;
-            bool _3604_onOwned;
-            bool _3605_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3606_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1614;
-            bool _out1615;
-            bool _out1616;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1617;
-            DCOMP.COMP.GenExpr(_3602_on, selfIdent, @params, false, out _out1614, out _out1615, out _out1616, out _out1617);
-            _3603_onString = _out1614;
-            _3604_onOwned = _out1615;
-            _3605_onErased = _out1616;
-            _3606_recIdents = _out1617;
-            if ((_3599_isDatatype) || (_3600_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3603_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3601_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3600_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3603_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3601_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3606_recIdents;
-          }
-        } else if (_source108.is_SeqBoundedPool) {
-          DAST._IExpression _3607___mcc_h190 = _source108.dtor_of;
-          bool _3608___mcc_h191 = _source108.dtor_includeDuplicates;
-          bool _3609_isDatatype = _3286___mcc_h45;
-          bool _3610_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3611_field = _3284___mcc_h43;
-          DAST._IExpression _3612_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3613_onString;
-            bool _3614_onOwned;
-            bool _3615_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3616_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1618;
-            bool _out1619;
-            bool _out1620;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1621;
-            DCOMP.COMP.GenExpr(_3612_on, selfIdent, @params, false, out _out1618, out _out1619, out _out1620, out _out1621);
-            _3613_onString = _out1618;
-            _3614_onOwned = _out1619;
-            _3615_onErased = _out1620;
-            _3616_recIdents = _out1621;
-            if ((_3609_isDatatype) || (_3610_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3613_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3611_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3610_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3613_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3611_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3616_recIdents;
-          }
-        } else {
-          DAST._IExpression _3617___mcc_h194 = _source108.dtor_lo;
-          DAST._IExpression _3618___mcc_h195 = _source108.dtor_hi;
-          bool _3619_isDatatype = _3286___mcc_h45;
-          bool _3620_isConstant = _3285___mcc_h44;
-          Dafny.ISequence<Dafny.Rune> _3621_field = _3284___mcc_h43;
-          DAST._IExpression _3622_on = _3283___mcc_h42;
-          {
-            Dafny.ISequence<Dafny.Rune> _3623_onString;
-            bool _3624_onOwned;
-            bool _3625_onErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3626_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1622;
-            bool _out1623;
-            bool _out1624;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1625;
-            DCOMP.COMP.GenExpr(_3622_on, selfIdent, @params, false, out _out1622, out _out1623, out _out1624, out _out1625);
-            _3623_onString = _out1622;
-            _3624_onOwned = _out1623;
-            _3625_onErased = _out1624;
-            _3626_recIdents = _out1625;
-            if ((_3619_isDatatype) || (_3620_isConstant)) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3623_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3621_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()"));
-              if (_3620_isConstant) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-              }
-              if (mustOwn) {
-                s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-                isOwned = true;
-              } else {
-                isOwned = false;
-              }
-            } else {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), _3623_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3621_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-              isOwned = true;
-            }
-            isErased = false;
-            readIdents = _3626_recIdents;
-          }
-        }
-      } else if (_source48.is_SelectFn) {
-        DAST._IExpression _3627___mcc_h198 = _source48.dtor_expr;
-        Dafny.ISequence<Dafny.Rune> _3628___mcc_h199 = _source48.dtor_field;
-        bool _3629___mcc_h200 = _source48.dtor_onDatatype;
-        bool _3630___mcc_h201 = _source48.dtor_isStatic;
-        BigInteger _3631___mcc_h202 = _source48.dtor_arity;
-        BigInteger _3632_arity = _3631___mcc_h202;
-        bool _3633_isStatic = _3630___mcc_h201;
-        bool _3634_isDatatype = _3629___mcc_h200;
-        Dafny.ISequence<Dafny.Rune> _3635_field = _3628___mcc_h199;
-        DAST._IExpression _3636_on = _3627___mcc_h198;
-        {
-          Dafny.ISequence<Dafny.Rune> _3637_onString;
-          bool _3638_onOwned;
-          bool _3639___v82;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3640_recIdents;
-          Dafny.ISequence<Dafny.Rune> _out1626;
-          bool _out1627;
-          bool _out1628;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1629;
-          DCOMP.COMP.GenExpr(_3636_on, selfIdent, @params, false, out _out1626, out _out1627, out _out1628, out _out1629);
-          _3637_onString = _out1626;
-          _3638_onOwned = _out1627;
-          _3639___v82 = _out1628;
-          _3640_recIdents = _out1629;
-          if (_3633_isStatic) {
-            s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3637_onString, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::")), DCOMP.__default.escapeIdent(_3635_field));
-          } else {
-            s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("{\n");
-            s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("let callTarget = (")), _3637_onString), ((_3638_onOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()")))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";\n"));
-            Dafny.ISequence<Dafny.Rune> _3641_args;
-            _3641_args = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-            BigInteger _3642_i;
-            _3642_i = BigInteger.Zero;
-            while ((_3642_i) < (_3632_arity)) {
-              if ((_3642_i).Sign == 1) {
-                _3641_args = Dafny.Sequence<Dafny.Rune>.Concat(_3641_args, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-              }
-              _3641_args = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3641_args, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("arg")), Std.Strings.__default.OfNat(_3642_i));
-              _3642_i = (_3642_i) + (BigInteger.One);
-            }
-            s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("move |")), _3641_args), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("| {\n"));
-            s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("callTarget.")), _3635_field), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _3641_args), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")\n"));
-            s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}\n"));
-            s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
-          }
-          Dafny.ISequence<Dafny.Rune> _3643_typeShape;
-          _3643_typeShape = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("dyn ::std::ops::Fn(");
-          BigInteger _3644_i;
-          _3644_i = BigInteger.Zero;
-          while ((_3644_i) < (_3632_arity)) {
-            if ((_3644_i).Sign == 1) {
-              _3643_typeShape = Dafny.Sequence<Dafny.Rune>.Concat(_3643_typeShape, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-            }
-            _3643_typeShape = Dafny.Sequence<Dafny.Rune>.Concat(_3643_typeShape, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&_"));
-            _3644_i = (_3644_i) + (BigInteger.One);
-          }
-          _3643_typeShape = Dafny.Sequence<Dafny.Rune>.Concat(_3643_typeShape, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") -> _"));
-          s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::FunctionWrapper(::std::rc::Rc::new("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") as ::std::rc::Rc<")), _3643_typeShape), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">)"));
-          isOwned = true;
-          isErased = false;
-          readIdents = _3640_recIdents;
-        }
-      } else if (_source48.is_Index) {
-        DAST._IExpression _3645___mcc_h203 = _source48.dtor_expr;
-        DAST._ICollKind _3646___mcc_h204 = _source48.dtor_collKind;
-        Dafny.ISequence<DAST._IExpression> _3647___mcc_h205 = _source48.dtor_indices;
-        Dafny.ISequence<DAST._IExpression> _3648_indices = _3647___mcc_h205;
-        DAST._ICollKind _3649_collKind = _3646___mcc_h204;
-        DAST._IExpression _3650_on = _3645___mcc_h203;
-        {
-          Dafny.ISequence<Dafny.Rune> _3651_onString;
-          bool _3652_onOwned;
-          bool _3653_onErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3654_recIdents;
-          Dafny.ISequence<Dafny.Rune> _out1630;
-          bool _out1631;
-          bool _out1632;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1633;
-          DCOMP.COMP.GenExpr(_3650_on, selfIdent, @params, false, out _out1630, out _out1631, out _out1632, out _out1633);
-          _3651_onString = _out1630;
-          _3652_onOwned = _out1631;
-          _3653_onErased = _out1632;
-          _3654_recIdents = _out1633;
-          readIdents = _3654_recIdents;
-          s = _3651_onString;
-          BigInteger _3655_i;
-          _3655_i = BigInteger.Zero;
-          while ((_3655_i) < (new BigInteger((_3648_indices).Count))) {
-            if (object.Equals(_3649_collKind, DAST.CollKind.create_Array())) {
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").borrow()"));
-            }
-            if (object.Equals(_3649_collKind, DAST.CollKind.create_Map())) {
-              Dafny.ISequence<Dafny.Rune> _3656_idx;
-              bool _3657_idxOwned;
-              bool _3658_idxErased;
-              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3659_recIdentsIdx;
-              Dafny.ISequence<Dafny.Rune> _out1634;
-              bool _out1635;
-              bool _out1636;
-              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1637;
-              DCOMP.COMP.GenExpr((_3648_indices).Select(_3655_i), selfIdent, @params, false, out _out1634, out _out1635, out _out1636, out _out1637);
-              _3656_idx = _out1634;
-              _3657_idxOwned = _out1635;
-              _3658_idxErased = _out1636;
-              _3659_recIdentsIdx = _out1637;
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")[")), ((_3657_idxOwned) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")))), _3656_idx), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("]"));
-              readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _3659_recIdentsIdx);
-            } else {
-              Dafny.ISequence<Dafny.Rune> _3660_idx;
-              bool _3661___v83;
-              bool _3662_idxErased;
-              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3663_recIdentsIdx;
-              Dafny.ISequence<Dafny.Rune> _out1638;
-              bool _out1639;
-              bool _out1640;
-              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1641;
-              DCOMP.COMP.GenExpr((_3648_indices).Select(_3655_i), selfIdent, @params, true, out _out1638, out _out1639, out _out1640, out _out1641);
-              _3660_idx = _out1638;
-              _3661___v83 = _out1639;
-              _3662_idxErased = _out1640;
-              _3663_recIdentsIdx = _out1641;
-              if (!(_3662_idxErased)) {
-                _3660_idx = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3660_idx), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-              s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")[<usize as ::dafny_runtime::NumCast>::from(")), _3660_idx), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").unwrap()]"));
-              readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _3663_recIdentsIdx);
-            }
-            _3655_i = (_3655_i) + (BigInteger.One);
-          }
-          if (mustOwn) {
-            s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()"));
-            isOwned = true;
-          } else {
-            s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(&"), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            isOwned = false;
-          }
-          isErased = _3653_onErased;
-        }
-      } else if (_source48.is_IndexRange) {
-        DAST._IExpression _3664___mcc_h206 = _source48.dtor_expr;
-        bool _3665___mcc_h207 = _source48.dtor_isArray;
-        Std.Wrappers._IOption<DAST._IExpression> _3666___mcc_h208 = _source48.dtor_low;
-        Std.Wrappers._IOption<DAST._IExpression> _3667___mcc_h209 = _source48.dtor_high;
-        Std.Wrappers._IOption<DAST._IExpression> _3668_high = _3667___mcc_h209;
-        Std.Wrappers._IOption<DAST._IExpression> _3669_low = _3666___mcc_h208;
-        bool _3670_isArray = _3665___mcc_h207;
-        DAST._IExpression _3671_on = _3664___mcc_h206;
-        {
-          Dafny.ISequence<Dafny.Rune> _3672_onString;
-          bool _3673_onOwned;
-          bool _3674_onErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3675_recIdents;
-          Dafny.ISequence<Dafny.Rune> _out1642;
-          bool _out1643;
-          bool _out1644;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1645;
-          DCOMP.COMP.GenExpr(_3671_on, selfIdent, @params, false, out _out1642, out _out1643, out _out1644, out _out1645);
-          _3672_onString = _out1642;
-          _3673_onOwned = _out1643;
-          _3674_onErased = _out1644;
-          _3675_recIdents = _out1645;
-          readIdents = _3675_recIdents;
-          s = _3672_onString;
-          Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _3676_lowString;
-          _3676_lowString = Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
-          Std.Wrappers._IOption<DAST._IExpression> _source109 = _3669_low;
-          if (_source109.is_None) {
-          } else {
-            DAST._IExpression _3677___mcc_h1195 = _source109.dtor_value;
-            DAST._IExpression _3678_l = _3677___mcc_h1195;
-            {
-              Dafny.ISequence<Dafny.Rune> _3679_lString;
-              bool _3680___v84;
-              bool _3681_lErased;
-              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3682_recIdentsL;
-              Dafny.ISequence<Dafny.Rune> _out1646;
-              bool _out1647;
-              bool _out1648;
-              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1649;
-              DCOMP.COMP.GenExpr(_3678_l, selfIdent, @params, true, out _out1646, out _out1647, out _out1648, out _out1649);
-              _3679_lString = _out1646;
-              _3680___v84 = _out1647;
-              _3681_lErased = _out1648;
-              _3682_recIdentsL = _out1649;
-              if (!(_3681_lErased)) {
-                _3679_lString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3679_lString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-              _3676_lowString = Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_Some(_3679_lString);
-              readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _3682_recIdentsL);
-            }
-          }
-          Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _3683_highString;
-          _3683_highString = Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
-          Std.Wrappers._IOption<DAST._IExpression> _source110 = _3668_high;
-          if (_source110.is_None) {
-          } else {
-            DAST._IExpression _3684___mcc_h1196 = _source110.dtor_value;
-            DAST._IExpression _3685_h = _3684___mcc_h1196;
-            {
-              Dafny.ISequence<Dafny.Rune> _3686_hString;
-              bool _3687___v85;
-              bool _3688_hErased;
-              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3689_recIdentsH;
-              Dafny.ISequence<Dafny.Rune> _out1650;
-              bool _out1651;
-              bool _out1652;
-              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1653;
-              DCOMP.COMP.GenExpr(_3685_h, selfIdent, @params, true, out _out1650, out _out1651, out _out1652, out _out1653);
-              _3686_hString = _out1650;
-              _3687___v85 = _out1651;
-              _3688_hErased = _out1652;
-              _3689_recIdentsH = _out1653;
-              if (!(_3688_hErased)) {
-                _3686_hString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3686_hString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-              }
-              _3683_highString = Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_Some(_3686_hString);
-              readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _3689_recIdentsH);
-            }
-          }
-          if (_3670_isArray) {
-            s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").borrow()"));
-          }
-          s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("[")), ((System.Func<Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>>, Dafny.ISequence<Dafny.Rune>>)((_source111) => {
-            if (_source111.is_None) {
-              return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-            } else {
-              Dafny.ISequence<Dafny.Rune> _3690___mcc_h1197 = _source111.dtor_value;
-              Dafny.ISequence<Dafny.Rune> _3691_l = _3690___mcc_h1197;
-              return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<usize as ::dafny_runtime::NumCast>::from("), _3691_l), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").unwrap()"));
-            }
-          }))(_3676_lowString)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("..")), ((System.Func<Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>>, Dafny.ISequence<Dafny.Rune>>)((_source112) => {
-            if (_source112.is_None) {
-              return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-            } else {
-              Dafny.ISequence<Dafny.Rune> _3692___mcc_h1198 = _source112.dtor_value;
-              Dafny.ISequence<Dafny.Rune> _3693_h = _3692___mcc_h1198;
-              return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<usize as ::dafny_runtime::NumCast>::from("), _3693_h), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").unwrap()"));
-            }
-          }))(_3683_highString)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("]"));
-          isErased = _3674_onErased;
-          s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".to_vec())"));
-          isOwned = true;
-        }
-      } else if (_source48.is_TupleSelect) {
-        DAST._IExpression _3694___mcc_h210 = _source48.dtor_expr;
-        BigInteger _3695___mcc_h211 = _source48.dtor_index;
-        BigInteger _3696_idx = _3695___mcc_h211;
-        DAST._IExpression _3697_on = _3694___mcc_h210;
-        {
-          Dafny.ISequence<Dafny.Rune> _3698_onString;
-          bool _3699___v86;
-          bool _3700_tupErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3701_recIdents;
-          Dafny.ISequence<Dafny.Rune> _out1654;
-          bool _out1655;
-          bool _out1656;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1657;
-          DCOMP.COMP.GenExpr(_3697_on, selfIdent, @params, false, out _out1654, out _out1655, out _out1656, out _out1657);
-          _3698_onString = _out1654;
-          _3699___v86 = _out1655;
-          _3700_tupErased = _out1656;
-          _3701_recIdents = _out1657;
-          s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3698_onString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), Std.Strings.__default.OfNat(_3696_idx));
-          if (mustOwn) {
-            s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".clone()"));
-            isOwned = true;
-          } else {
-            s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), s);
-            isOwned = false;
-          }
-          isErased = _3700_tupErased;
-          readIdents = _3701_recIdents;
-        }
-      } else if (_source48.is_Call) {
-        DAST._IExpression _3702___mcc_h212 = _source48.dtor_on;
-        Dafny.ISequence<Dafny.Rune> _3703___mcc_h213 = _source48.dtor_name;
-        Dafny.ISequence<DAST._IType> _3704___mcc_h214 = _source48.dtor_typeArgs;
-        Dafny.ISequence<DAST._IExpression> _3705___mcc_h215 = _source48.dtor_args;
-        Dafny.ISequence<DAST._IExpression> _3706_args = _3705___mcc_h215;
-        Dafny.ISequence<DAST._IType> _3707_typeArgs = _3704___mcc_h214;
-        Dafny.ISequence<Dafny.Rune> _3708_name = _3703___mcc_h213;
-        DAST._IExpression _3709_on = _3702___mcc_h212;
-        {
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-          Dafny.ISequence<Dafny.Rune> _3710_typeArgString;
-          _3710_typeArgString = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-          if ((new BigInteger((_3707_typeArgs).Count)) >= (BigInteger.One)) {
-            BigInteger _3711_typeI;
-            _3711_typeI = BigInteger.Zero;
-            _3710_typeArgString = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::<");
-            while ((_3711_typeI) < (new BigInteger((_3707_typeArgs).Count))) {
-              if ((_3711_typeI).Sign == 1) {
-                _3710_typeArgString = Dafny.Sequence<Dafny.Rune>.Concat(_3710_typeArgString, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-              }
-              Dafny.ISequence<Dafny.Rune> _3712_typeString;
-              Dafny.ISequence<Dafny.Rune> _out1658;
-              _out1658 = DCOMP.COMP.GenType((_3707_typeArgs).Select(_3711_typeI), false, false);
-              _3712_typeString = _out1658;
-              _3710_typeArgString = Dafny.Sequence<Dafny.Rune>.Concat(_3710_typeArgString, _3712_typeString);
-              _3711_typeI = (_3711_typeI) + (BigInteger.One);
-            }
-            _3710_typeArgString = Dafny.Sequence<Dafny.Rune>.Concat(_3710_typeArgString, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">"));
-          }
-          Dafny.ISequence<Dafny.Rune> _3713_argString;
-          _3713_argString = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-          BigInteger _3714_i;
-          _3714_i = BigInteger.Zero;
-          while ((_3714_i) < (new BigInteger((_3706_args).Count))) {
-            if ((_3714_i).Sign == 1) {
-              _3713_argString = Dafny.Sequence<Dafny.Rune>.Concat(_3713_argString, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-            }
-            Dafny.ISequence<Dafny.Rune> _3715_argExpr;
-            bool _3716_isOwned;
-            bool _3717_argErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3718_argIdents;
-            Dafny.ISequence<Dafny.Rune> _out1659;
-            bool _out1660;
-            bool _out1661;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1662;
-            DCOMP.COMP.GenExpr((_3706_args).Select(_3714_i), selfIdent, @params, false, out _out1659, out _out1660, out _out1661, out _out1662);
-            _3715_argExpr = _out1659;
-            _3716_isOwned = _out1660;
-            _3717_argErased = _out1661;
-            _3718_argIdents = _out1662;
-            if (_3716_isOwned) {
-              _3715_argExpr = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&("), _3715_argExpr), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            }
-            if (!(_3717_argErased)) {
-              _3715_argExpr = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase("), _3715_argExpr), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            }
-            _3715_argExpr = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyUnerasable::unerase("), _3715_argExpr), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            _3713_argString = Dafny.Sequence<Dafny.Rune>.Concat(_3713_argString, _3715_argExpr);
-            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _3718_argIdents);
-            _3714_i = (_3714_i) + (BigInteger.One);
-          }
-          Dafny.ISequence<Dafny.Rune> _3719_enclosingString;
-          bool _3720___v87;
-          bool _3721___v88;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3722_recIdents;
-          Dafny.ISequence<Dafny.Rune> _out1663;
-          bool _out1664;
-          bool _out1665;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1666;
-          DCOMP.COMP.GenExpr(_3709_on, selfIdent, @params, false, out _out1663, out _out1664, out _out1665, out _out1666);
-          _3719_enclosingString = _out1663;
-          _3720___v87 = _out1664;
-          _3721___v88 = _out1665;
-          _3722_recIdents = _out1666;
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _3722_recIdents);
-          DAST._IExpression _source113 = _3709_on;
-          if (_source113.is_Literal) {
-            DAST._ILiteral _3723___mcc_h1199 = _source113.dtor_Literal_a0;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_Ident) {
-            Dafny.ISequence<Dafny.Rune> _3724___mcc_h1201 = _source113.dtor_Ident_a0;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_Companion) {
-            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3725___mcc_h1203 = _source113.dtor_Companion_a0;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3719_enclosingString, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_Tuple) {
-            Dafny.ISequence<DAST._IExpression> _3726___mcc_h1205 = _source113.dtor_Tuple_a0;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_New) {
-            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3727___mcc_h1207 = _source113.dtor_path;
-            Dafny.ISequence<DAST._IType> _3728___mcc_h1208 = _source113.dtor_typeArgs;
-            Dafny.ISequence<DAST._IExpression> _3729___mcc_h1209 = _source113.dtor_args;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_NewArray) {
-            Dafny.ISequence<DAST._IExpression> _3730___mcc_h1213 = _source113.dtor_dims;
-            DAST._IType _3731___mcc_h1214 = _source113.dtor_typ;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_DatatypeValue) {
-            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3732___mcc_h1217 = _source113.dtor_path;
-            Dafny.ISequence<DAST._IType> _3733___mcc_h1218 = _source113.dtor_typeArgs;
-            Dafny.ISequence<Dafny.Rune> _3734___mcc_h1219 = _source113.dtor_variant;
-            bool _3735___mcc_h1220 = _source113.dtor_isCo;
-            Dafny.ISequence<_System._ITuple2<Dafny.ISequence<Dafny.Rune>, DAST._IExpression>> _3736___mcc_h1221 = _source113.dtor_contents;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_Convert) {
-            DAST._IExpression _3737___mcc_h1227 = _source113.dtor_value;
-            DAST._IType _3738___mcc_h1228 = _source113.dtor_from;
-            DAST._IType _3739___mcc_h1229 = _source113.dtor_typ;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_SeqConstruct) {
-            DAST._IExpression _3740___mcc_h1233 = _source113.dtor_length;
-            DAST._IExpression _3741___mcc_h1234 = _source113.dtor_elem;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_SeqValue) {
-            Dafny.ISequence<DAST._IExpression> _3742___mcc_h1237 = _source113.dtor_elements;
-            DAST._IType _3743___mcc_h1238 = _source113.dtor_typ;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_SetValue) {
-            Dafny.ISequence<DAST._IExpression> _3744___mcc_h1241 = _source113.dtor_elements;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_MapValue) {
-            Dafny.ISequence<_System._ITuple2<DAST._IExpression, DAST._IExpression>> _3745___mcc_h1243 = _source113.dtor_mapElems;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_This) {
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_Ite) {
-            DAST._IExpression _3746___mcc_h1245 = _source113.dtor_cond;
-            DAST._IExpression _3747___mcc_h1246 = _source113.dtor_thn;
-            DAST._IExpression _3748___mcc_h1247 = _source113.dtor_els;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_UnOp) {
-            DAST._IUnaryOp _3749___mcc_h1251 = _source113.dtor_unOp;
-            DAST._IExpression _3750___mcc_h1252 = _source113.dtor_expr;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_BinOp) {
-            DAST._IBinOp _3751___mcc_h1255 = _source113.dtor_op;
-            DAST._IExpression _3752___mcc_h1256 = _source113.dtor_left;
-            DAST._IExpression _3753___mcc_h1257 = _source113.dtor_right;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_ArrayLen) {
-            DAST._IExpression _3754___mcc_h1261 = _source113.dtor_expr;
-            BigInteger _3755___mcc_h1262 = _source113.dtor_dim;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_Select) {
-            DAST._IExpression _3756___mcc_h1265 = _source113.dtor_expr;
-            Dafny.ISequence<Dafny.Rune> _3757___mcc_h1266 = _source113.dtor_field;
-            bool _3758___mcc_h1267 = _source113.dtor_isConstant;
-            bool _3759___mcc_h1268 = _source113.dtor_onDatatype;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_SelectFn) {
-            DAST._IExpression _3760___mcc_h1273 = _source113.dtor_expr;
-            Dafny.ISequence<Dafny.Rune> _3761___mcc_h1274 = _source113.dtor_field;
-            bool _3762___mcc_h1275 = _source113.dtor_onDatatype;
-            bool _3763___mcc_h1276 = _source113.dtor_isStatic;
-            BigInteger _3764___mcc_h1277 = _source113.dtor_arity;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_Index) {
-            DAST._IExpression _3765___mcc_h1283 = _source113.dtor_expr;
-            DAST._ICollKind _3766___mcc_h1284 = _source113.dtor_collKind;
-            Dafny.ISequence<DAST._IExpression> _3767___mcc_h1285 = _source113.dtor_indices;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_IndexRange) {
-            DAST._IExpression _3768___mcc_h1289 = _source113.dtor_expr;
-            bool _3769___mcc_h1290 = _source113.dtor_isArray;
-            Std.Wrappers._IOption<DAST._IExpression> _3770___mcc_h1291 = _source113.dtor_low;
-            Std.Wrappers._IOption<DAST._IExpression> _3771___mcc_h1292 = _source113.dtor_high;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_TupleSelect) {
-            DAST._IExpression _3772___mcc_h1297 = _source113.dtor_expr;
-            BigInteger _3773___mcc_h1298 = _source113.dtor_index;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_Call) {
-            DAST._IExpression _3774___mcc_h1301 = _source113.dtor_on;
-            Dafny.ISequence<Dafny.Rune> _3775___mcc_h1302 = _source113.dtor_name;
-            Dafny.ISequence<DAST._IType> _3776___mcc_h1303 = _source113.dtor_typeArgs;
-            Dafny.ISequence<DAST._IExpression> _3777___mcc_h1304 = _source113.dtor_args;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_Lambda) {
-            Dafny.ISequence<DAST._IFormal> _3778___mcc_h1309 = _source113.dtor_params;
-            DAST._IType _3779___mcc_h1310 = _source113.dtor_retType;
-            Dafny.ISequence<DAST._IStatement> _3780___mcc_h1311 = _source113.dtor_body;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_BetaRedex) {
-            Dafny.ISequence<_System._ITuple2<DAST._IFormal, DAST._IExpression>> _3781___mcc_h1315 = _source113.dtor_values;
-            DAST._IType _3782___mcc_h1316 = _source113.dtor_retType;
-            DAST._IExpression _3783___mcc_h1317 = _source113.dtor_expr;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_IIFE) {
-            Dafny.ISequence<Dafny.Rune> _3784___mcc_h1321 = _source113.dtor_name;
-            DAST._IType _3785___mcc_h1322 = _source113.dtor_typ;
-            DAST._IExpression _3786___mcc_h1323 = _source113.dtor_value;
-            DAST._IExpression _3787___mcc_h1324 = _source113.dtor_iifeBody;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_Apply) {
-            DAST._IExpression _3788___mcc_h1329 = _source113.dtor_expr;
-            Dafny.ISequence<DAST._IExpression> _3789___mcc_h1330 = _source113.dtor_args;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_TypeTest) {
-            DAST._IExpression _3790___mcc_h1333 = _source113.dtor_on;
-            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3791___mcc_h1334 = _source113.dtor_dType;
-            Dafny.ISequence<Dafny.Rune> _3792___mcc_h1335 = _source113.dtor_variant;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_InitializationValue) {
-            DAST._IType _3793___mcc_h1339 = _source113.dtor_typ;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_BoolBoundedPool) {
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_SetBoundedPool) {
-            DAST._IExpression _3794___mcc_h1341 = _source113.dtor_of;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else if (_source113.is_SeqBoundedPool) {
-            DAST._IExpression _3795___mcc_h1343 = _source113.dtor_of;
-            bool _3796___mcc_h1344 = _source113.dtor_includeDuplicates;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          } else {
-            DAST._IExpression _3797___mcc_h1347 = _source113.dtor_lo;
-            DAST._IExpression _3798___mcc_h1348 = _source113.dtor_hi;
-            {
-              _3719_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3719_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").")), DCOMP.__default.escapeIdent((_3708_name)));
-            }
-          }
-          s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3719_enclosingString, _3710_typeArgString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _3713_argString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-          isOwned = true;
-          isErased = false;
-        }
-      } else if (_source48.is_Lambda) {
-        Dafny.ISequence<DAST._IFormal> _3799___mcc_h216 = _source48.dtor_params;
-        DAST._IType _3800___mcc_h217 = _source48.dtor_retType;
-        Dafny.ISequence<DAST._IStatement> _3801___mcc_h218 = _source48.dtor_body;
-        Dafny.ISequence<DAST._IStatement> _3802_body = _3801___mcc_h218;
-        DAST._IType _3803_retType = _3800___mcc_h217;
-        Dafny.ISequence<DAST._IFormal> _3804_params = _3799___mcc_h216;
-        {
-          Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3805_paramNames;
-          _3805_paramNames = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements();
-          BigInteger _3806_i;
-          _3806_i = BigInteger.Zero;
-          while ((_3806_i) < (new BigInteger((_3804_params).Count))) {
-            _3805_paramNames = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Concat(_3805_paramNames, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(((_3804_params).Select(_3806_i)).dtor_name));
-            _3806_i = (_3806_i) + (BigInteger.One);
-          }
-          Dafny.ISequence<Dafny.Rune> _3807_recursiveGen;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3808_recIdents;
-          Dafny.ISequence<Dafny.Rune> _out1667;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1668;
-          DCOMP.COMP.GenStmts(_3802_body, ((!object.Equals(selfIdent, Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None())) ? (Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_Some(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_this"))) : (Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None())), _3805_paramNames, true, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), out _out1667, out _out1668);
-          _3807_recursiveGen = _out1667;
-          _3808_recIdents = _out1668;
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-          Dafny.ISequence<Dafny.Rune> _3809_allReadCloned;
-          _3809_allReadCloned = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-          while (!(_3808_recIdents).Equals(Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements())) {
-            Dafny.ISequence<Dafny.Rune> _3810_next;
-            foreach (Dafny.ISequence<Dafny.Rune> _assign_such_that_3 in (_3808_recIdents).Elements) {
-              _3810_next = (Dafny.ISequence<Dafny.Rune>)_assign_such_that_3;
-              if ((_3808_recIdents).Contains(_3810_next)) {
-                goto after__ASSIGN_SUCH_THAT_3;
-              }
-            }
-            throw new System.Exception("assign-such-that search produced no value (line 2536)");
-          after__ASSIGN_SUCH_THAT_3:;
-            if ((!object.Equals(selfIdent, Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None())) && ((_3810_next).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_this")))) {
-              if (!object.Equals(selfIdent, Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None())) {
-                _3809_allReadCloned = Dafny.Sequence<Dafny.Rune>.Concat(_3809_allReadCloned, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("let _this = self.clone();\n"));
-              }
-            } else if (!((_3805_paramNames).Contains(_3810_next))) {
-              _3809_allReadCloned = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3809_allReadCloned, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("let ")), DCOMP.__default.escapeIdent(_3810_next)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" = ")), DCOMP.__default.escapeIdent(_3810_next)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".clone();\n"));
-              readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements(_3810_next));
-            }
-            _3808_recIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Difference(_3808_recIdents, Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements(_3810_next));
-          }
-          Dafny.ISequence<Dafny.Rune> _3811_paramsString;
-          _3811_paramsString = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-          Dafny.ISequence<Dafny.Rune> _3812_paramTypes;
-          _3812_paramTypes = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-          _3806_i = BigInteger.Zero;
-          while ((_3806_i) < (new BigInteger((_3804_params).Count))) {
-            if ((_3806_i).Sign == 1) {
-              _3811_paramsString = Dafny.Sequence<Dafny.Rune>.Concat(_3811_paramsString, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-              _3812_paramTypes = Dafny.Sequence<Dafny.Rune>.Concat(_3812_paramTypes, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-            }
-            Dafny.ISequence<Dafny.Rune> _3813_typStr;
-            Dafny.ISequence<Dafny.Rune> _out1669;
-            _out1669 = DCOMP.COMP.GenType(((_3804_params).Select(_3806_i)).dtor_typ, false, true);
-            _3813_typStr = _out1669;
-            _3811_paramsString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3811_paramsString, DCOMP.__default.escapeIdent(((_3804_params).Select(_3806_i)).dtor_name)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(": &")), _3813_typStr);
-            _3812_paramTypes = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3812_paramTypes, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&")), _3813_typStr);
-            _3806_i = (_3806_i) + (BigInteger.One);
-          }
-          Dafny.ISequence<Dafny.Rune> _3814_retTypeGen;
-          Dafny.ISequence<Dafny.Rune> _out1670;
-          _out1670 = DCOMP.COMP.GenType(_3803_retType, false, true);
-          _3814_retTypeGen = _out1670;
-          s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::FunctionWrapper::<::std::rc::Rc<dyn ::std::ops::Fn("), _3812_paramTypes), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") -> ")), _3814_retTypeGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">>({\n")), _3809_allReadCloned), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::new(move |")), _3811_paramsString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("| -> ")), _3814_retTypeGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {\n")), _3807_recursiveGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n})})"));
-          isOwned = true;
-          isErased = false;
-        }
-      } else if (_source48.is_BetaRedex) {
-        Dafny.ISequence<_System._ITuple2<DAST._IFormal, DAST._IExpression>> _3815___mcc_h219 = _source48.dtor_values;
-        DAST._IType _3816___mcc_h220 = _source48.dtor_retType;
-        DAST._IExpression _3817___mcc_h221 = _source48.dtor_expr;
-        DAST._IExpression _3818_expr = _3817___mcc_h221;
-        DAST._IType _3819_retType = _3816___mcc_h220;
-        Dafny.ISequence<_System._ITuple2<DAST._IFormal, DAST._IExpression>> _3820_values = _3815___mcc_h219;
-        {
-          Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3821_paramNames;
-          _3821_paramNames = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements();
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3822_paramNamesSet;
-          _3822_paramNamesSet = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-          BigInteger _3823_i;
-          _3823_i = BigInteger.Zero;
-          while ((_3823_i) < (new BigInteger((_3820_values).Count))) {
-            _3821_paramNames = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Concat(_3821_paramNames, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements((((_3820_values).Select(_3823_i)).dtor__0).dtor_name));
-            _3822_paramNamesSet = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(_3822_paramNamesSet, Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements((((_3820_values).Select(_3823_i)).dtor__0).dtor_name));
-            _3823_i = (_3823_i) + (BigInteger.One);
-          }
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-          s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("{\n");
-          Dafny.ISequence<Dafny.Rune> _3824_paramsString;
-          _3824_paramsString = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-          _3823_i = BigInteger.Zero;
-          while ((_3823_i) < (new BigInteger((_3820_values).Count))) {
-            if ((_3823_i).Sign == 1) {
-              _3824_paramsString = Dafny.Sequence<Dafny.Rune>.Concat(_3824_paramsString, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-            }
-            Dafny.ISequence<Dafny.Rune> _3825_typStr;
-            Dafny.ISequence<Dafny.Rune> _out1671;
-            _out1671 = DCOMP.COMP.GenType((((_3820_values).Select(_3823_i)).dtor__0).dtor_typ, false, true);
-            _3825_typStr = _out1671;
-            Dafny.ISequence<Dafny.Rune> _3826_valueGen;
-            bool _3827___v91;
-            bool _3828_valueErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3829_recIdents;
-            Dafny.ISequence<Dafny.Rune> _out1672;
-            bool _out1673;
-            bool _out1674;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1675;
-            DCOMP.COMP.GenExpr(((_3820_values).Select(_3823_i)).dtor__1, selfIdent, @params, true, out _out1672, out _out1673, out _out1674, out _out1675);
-            _3826_valueGen = _out1672;
-            _3827___v91 = _out1673;
-            _3828_valueErased = _out1674;
-            _3829_recIdents = _out1675;
-            s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("let ")), DCOMP.__default.escapeIdent((((_3820_values).Select(_3823_i)).dtor__0).dtor_name)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(": ")), _3825_typStr), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" = "));
-            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _3829_recIdents);
-            if (_3828_valueErased) {
-              _3826_valueGen = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyUnerasable::<_>::unerase_owned"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _3826_valueGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-            }
-            s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(s, _3826_valueGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";\n"));
-            _3823_i = (_3823_i) + (BigInteger.One);
-          }
-          Dafny.ISequence<Dafny.Rune> _3830_recGen;
-          bool _3831_recOwned;
-          bool _3832_recErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3833_recIdents;
-          Dafny.ISequence<Dafny.Rune> _out1676;
-          bool _out1677;
-          bool _out1678;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1679;
-          DCOMP.COMP.GenExpr(_3818_expr, selfIdent, _3821_paramNames, mustOwn, out _out1676, out _out1677, out _out1678, out _out1679);
-          _3830_recGen = _out1676;
-          _3831_recOwned = _out1677;
-          _3832_recErased = _out1678;
-          _3833_recIdents = _out1679;
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Difference(_3833_recIdents, _3822_paramNamesSet);
-          s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(s, _3830_recGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n}"));
-          isOwned = _3831_recOwned;
-          isErased = _3832_recErased;
-        }
-      } else if (_source48.is_IIFE) {
-        Dafny.ISequence<Dafny.Rune> _3834___mcc_h222 = _source48.dtor_name;
-        DAST._IType _3835___mcc_h223 = _source48.dtor_typ;
-        DAST._IExpression _3836___mcc_h224 = _source48.dtor_value;
-        DAST._IExpression _3837___mcc_h225 = _source48.dtor_iifeBody;
-        DAST._IExpression _3838_iifeBody = _3837___mcc_h225;
-        DAST._IExpression _3839_value = _3836___mcc_h224;
-        DAST._IType _3840_tpe = _3835___mcc_h223;
-        Dafny.ISequence<Dafny.Rune> _3841_name = _3834___mcc_h222;
-        {
-          Dafny.ISequence<Dafny.Rune> _3842_valueGen;
-          bool _3843___v92;
-          bool _3844_valueErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3845_recIdents;
-          Dafny.ISequence<Dafny.Rune> _out1680;
-          bool _out1681;
-          bool _out1682;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1683;
-          DCOMP.COMP.GenExpr(_3839_value, selfIdent, @params, true, out _out1680, out _out1681, out _out1682, out _out1683);
-          _3842_valueGen = _out1680;
-          _3843___v92 = _out1681;
-          _3844_valueErased = _out1682;
-          _3845_recIdents = _out1683;
-          if (_3844_valueErased) {
-            _3842_valueGen = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyUnerasable::<_>::unerase_owned"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _3842_valueGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-          }
-          readIdents = _3845_recIdents;
-          Dafny.ISequence<Dafny.Rune> _3846_valueTypeGen;
-          Dafny.ISequence<Dafny.Rune> _out1684;
-          _out1684 = DCOMP.COMP.GenType(_3840_tpe, false, true);
-          _3846_valueTypeGen = _out1684;
-          Dafny.ISequence<Dafny.Rune> _3847_bodyGen;
-          bool _3848___v93;
-          bool _3849_bodyErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3850_bodyIdents;
-          Dafny.ISequence<Dafny.Rune> _out1685;
-          bool _out1686;
-          bool _out1687;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1688;
-          DCOMP.COMP.GenExpr(_3838_iifeBody, selfIdent, @params, true, out _out1685, out _out1686, out _out1687, out _out1688);
-          _3847_bodyGen = _out1685;
-          _3848___v93 = _out1686;
-          _3849_bodyErased = _out1687;
-          _3850_bodyIdents = _out1688;
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Difference(_3850_bodyIdents, Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements((_3841_name))));
-          s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("{\nlet "), DCOMP.__default.escapeIdent((_3841_name))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(": ")), _3846_valueTypeGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" = ")), _3842_valueGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";\n")), _3847_bodyGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n}"));
-          isOwned = true;
-          isErased = _3849_bodyErased;
-        }
-      } else if (_source48.is_Apply) {
-        DAST._IExpression _3851___mcc_h226 = _source48.dtor_expr;
-        Dafny.ISequence<DAST._IExpression> _3852___mcc_h227 = _source48.dtor_args;
-        Dafny.ISequence<DAST._IExpression> _3853_args = _3852___mcc_h227;
-        DAST._IExpression _3854_func = _3851___mcc_h226;
-        {
-          Dafny.ISequence<Dafny.Rune> _3855_funcString;
-          bool _3856___v94;
-          bool _3857_funcErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3858_recIdents;
-          Dafny.ISequence<Dafny.Rune> _out1689;
-          bool _out1690;
-          bool _out1691;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1692;
-          DCOMP.COMP.GenExpr(_3854_func, selfIdent, @params, false, out _out1689, out _out1690, out _out1691, out _out1692);
-          _3855_funcString = _out1689;
-          _3856___v94 = _out1690;
-          _3857_funcErased = _out1691;
-          _3858_recIdents = _out1692;
-          readIdents = _3858_recIdents;
-          Dafny.ISequence<Dafny.Rune> _3859_argString;
-          _3859_argString = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
-          BigInteger _3860_i;
-          _3860_i = BigInteger.Zero;
-          while ((_3860_i) < (new BigInteger((_3853_args).Count))) {
-            if ((_3860_i).Sign == 1) {
-              _3859_argString = Dafny.Sequence<Dafny.Rune>.Concat(_3859_argString, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
-            }
-            Dafny.ISequence<Dafny.Rune> _3861_argExpr;
-            bool _3862_isOwned;
-            bool _3863_argErased;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3864_argIdents;
-            Dafny.ISequence<Dafny.Rune> _out1693;
-            bool _out1694;
-            bool _out1695;
-            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1696;
-            DCOMP.COMP.GenExpr((_3853_args).Select(_3860_i), selfIdent, @params, false, out _out1693, out _out1694, out _out1695, out _out1696);
-            _3861_argExpr = _out1693;
-            _3862_isOwned = _out1694;
-            _3863_argErased = _out1695;
-            _3864_argIdents = _out1696;
-            if (_3862_isOwned) {
-              _3861_argExpr = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), _3861_argExpr);
-            }
-            _3859_argString = Dafny.Sequence<Dafny.Rune>.Concat(_3859_argString, _3861_argExpr);
-            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _3864_argIdents);
-            _3860_i = (_3860_i) + (BigInteger.One);
-          }
-          s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(("), _3855_funcString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _3859_argString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("))"));
-          isOwned = true;
-          isErased = false;
-        }
-      } else if (_source48.is_TypeTest) {
-        DAST._IExpression _3865___mcc_h228 = _source48.dtor_on;
-        Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3866___mcc_h229 = _source48.dtor_dType;
-        Dafny.ISequence<Dafny.Rune> _3867___mcc_h230 = _source48.dtor_variant;
-        Dafny.ISequence<Dafny.Rune> _3868_variant = _3867___mcc_h230;
-        Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3869_dType = _3866___mcc_h229;
-        DAST._IExpression _3870_on = _3865___mcc_h228;
-        {
-          Dafny.ISequence<Dafny.Rune> _3871_exprGen;
-          bool _3872___v95;
-          bool _3873_exprErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3874_recIdents;
-          Dafny.ISequence<Dafny.Rune> _out1697;
-          bool _out1698;
-          bool _out1699;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1700;
-          DCOMP.COMP.GenExpr(_3870_on, selfIdent, @params, false, out _out1697, out _out1698, out _out1699, out _out1700);
-          _3871_exprGen = _out1697;
-          _3872___v95 = _out1698;
-          _3873_exprErased = _out1699;
-          _3874_recIdents = _out1700;
-          Dafny.ISequence<Dafny.Rune> _3875_dTypePath;
-          Dafny.ISequence<Dafny.Rune> _out1701;
-          _out1701 = DCOMP.COMP.GenPath(_3869_dType);
-          _3875_dTypePath = _out1701;
-          s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("matches!("), _3871_exprGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".as_ref(), ")), _3875_dTypePath), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::")), DCOMP.__default.escapeIdent(_3868_variant)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("{ .. })"));
-          isOwned = true;
-          isErased = true;
-          readIdents = _3874_recIdents;
-        }
-      } else if (_source48.is_InitializationValue) {
-        DAST._IType _3876___mcc_h231 = _source48.dtor_typ;
-        DAST._IType _3877_typ = _3876___mcc_h231;
-        {
-          Dafny.ISequence<Dafny.Rune> _3878_typString;
-          Dafny.ISequence<Dafny.Rune> _out1702;
-          _out1702 = DCOMP.COMP.GenType(_3877_typ, false, false);
-          _3878_typString = _out1702;
-          s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _3878_typString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as std::default::Default>::default()"));
-          isOwned = true;
-          isErased = false;
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-        }
-      } else if (_source48.is_BoolBoundedPool) {
-        {
-          s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("[false, true]");
-          isOwned = true;
-          isErased = true;
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
-        }
-      } else if (_source48.is_SetBoundedPool) {
-        DAST._IExpression _3879___mcc_h232 = _source48.dtor_of;
-        DAST._IExpression _3880_of = _3879___mcc_h232;
-        {
-          Dafny.ISequence<Dafny.Rune> _3881_exprGen;
-          bool _3882___v96;
-          bool _3883_exprErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3884_recIdents;
-          Dafny.ISequence<Dafny.Rune> _out1703;
-          bool _out1704;
-          bool _out1705;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1706;
-          DCOMP.COMP.GenExpr(_3880_of, selfIdent, @params, false, out _out1703, out _out1704, out _out1705, out _out1706);
-          _3881_exprGen = _out1703;
-          _3882___v96 = _out1704;
-          _3883_exprErased = _out1705;
-          _3884_recIdents = _out1706;
-          s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3881_exprGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").iter()"));
-          isOwned = true;
-          isErased = _3883_exprErased;
-          readIdents = _3884_recIdents;
-        }
-      } else if (_source48.is_SeqBoundedPool) {
-        DAST._IExpression _3885___mcc_h233 = _source48.dtor_of;
-        bool _3886___mcc_h234 = _source48.dtor_includeDuplicates;
-        bool _3887_includeDuplicates = _3886___mcc_h234;
-        DAST._IExpression _3888_of = _3885___mcc_h233;
-        {
-          Dafny.ISequence<Dafny.Rune> _3889_exprGen;
-          bool _3890___v97;
-          bool _3891_exprErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3892_recIdents;
-          Dafny.ISequence<Dafny.Rune> _out1707;
-          bool _out1708;
-          bool _out1709;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1710;
-          DCOMP.COMP.GenExpr(_3888_of, selfIdent, @params, false, out _out1707, out _out1708, out _out1709, out _out1710);
-          _3889_exprGen = _out1707;
-          _3890___v97 = _out1708;
-          _3891_exprErased = _out1709;
-          _3892_recIdents = _out1710;
-          s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _3889_exprGen), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").iter()"));
-          if (!(_3887_includeDuplicates)) {
-            s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::itertools::Itertools::unique("), s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-          }
-          isOwned = true;
-          isErased = _3891_exprErased;
-          readIdents = _3892_recIdents;
-        }
-      } else {
-        DAST._IExpression _3893___mcc_h235 = _source48.dtor_lo;
-        DAST._IExpression _3894___mcc_h236 = _source48.dtor_hi;
-        DAST._IExpression _3895_hi = _3894___mcc_h236;
-        DAST._IExpression _3896_lo = _3893___mcc_h235;
-        {
-          Dafny.ISequence<Dafny.Rune> _3897_loString;
-          bool _3898___v98;
-          bool _3899_loErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3900_recIdentsLo;
-          Dafny.ISequence<Dafny.Rune> _out1711;
-          bool _out1712;
-          bool _out1713;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1714;
-          DCOMP.COMP.GenExpr(_3896_lo, selfIdent, @params, true, out _out1711, out _out1712, out _out1713, out _out1714);
-          _3897_loString = _out1711;
-          _3898___v98 = _out1712;
-          _3899_loErased = _out1713;
-          _3900_recIdentsLo = _out1714;
-          Dafny.ISequence<Dafny.Rune> _3901_hiString;
-          bool _3902___v99;
-          bool _3903_hiErased;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3904_recIdentsHi;
-          Dafny.ISequence<Dafny.Rune> _out1715;
-          bool _out1716;
-          bool _out1717;
-          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1718;
-          DCOMP.COMP.GenExpr(_3895_hi, selfIdent, @params, true, out _out1715, out _out1716, out _out1717, out _out1718);
-          _3901_hiString = _out1715;
-          _3902___v99 = _out1716;
-          _3903_hiErased = _out1717;
-          _3904_recIdentsHi = _out1718;
-          if (!(_3899_loErased)) {
-            _3897_loString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3897_loString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-          }
-          if (!(_3903_hiErased)) {
-            _3901_hiString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyErasable::erase_owned("), _3901_hiString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-          }
-          s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::integer_range("), _3897_loString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), _3901_hiString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
-          isOwned = true;
-          isErased = true;
-          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(_3900_recIdentsLo, _3904_recIdentsHi);
-        }
-      }
-    }
-    public static Dafny.ISequence<Dafny.Rune> Compile(Dafny.ISequence<DAST._IModule> p) {
-      Dafny.ISequence<Dafny.Rune> s = Dafny.Sequence<Dafny.Rune>.Empty;
-      s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("#![allow(warnings, unconditional_panic)]\n");
-      s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("#![allow(nonstandard_style)]\n"));
-      s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("extern crate dafny_runtime;\n"));
-      BigInteger _3905_i;
-      _3905_i = BigInteger.Zero;
-      while ((_3905_i) < (new BigInteger((p).Count))) {
-        Dafny.ISequence<Dafny.Rune> _3906_generated = Dafny.Sequence<Dafny.Rune>.Empty;
-        RAST._IMod _3907_m;
-        RAST._IMod _out1719;
-        _out1719 = DCOMP.COMP.GenModule((p).Select(_3905_i), Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements());
-        _3907_m = _out1719;
-        _3906_generated = (_3907_m)._ToString(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""));
-        if ((_3905_i).Sign == 1) {
-          s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"));
-        }
-        s = Dafny.Sequence<Dafny.Rune>.Concat(s, _3906_generated);
-        _3905_i = (_3905_i) + (BigInteger.One);
-      }
-      return s;
-    }
-    public static Dafny.ISequence<Dafny.Rune> EmitCallToMain(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> fullName) {
-      Dafny.ISequence<Dafny.Rune> s = Dafny.Sequence<Dafny.Rune>.Empty;
-      s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\nfn main() {\n");
-      BigInteger _3908_i;
-      _3908_i = BigInteger.Zero;
-      while ((_3908_i) < (new BigInteger((fullName).Count))) {
-        if ((_3908_i).Sign == 1) {
-          s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::"));
-        }
-        s = Dafny.Sequence<Dafny.Rune>.Concat(s, DCOMP.__default.escapeIdent((fullName).Select(_3908_i)));
-        _3908_i = (_3908_i) + (BigInteger.One);
-      }
-      s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("();\n}"));
-      return s;
-    }
-  }
-} // end of namespace DCOMP
-
diff --git a/Source/DafnyCore/GeneratedFromDafny/D2DPrettyPrinter.cs b/Source/DafnyCore/GeneratedFromDafny/D2DPrettyPrinter.cs
new file mode 100644
index 00000000000..6329abd9049
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/D2DPrettyPrinter.cs
@@ -0,0 +1,23 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace D2DPrettyPrinter {
+
+  public partial class __default {
+    public static Dafny.ISequence<Dafny.Rune> PrettyPrint(Dafny.ISequence<DAST._IModule> d)
+    {
+      Dafny.ISequence<Dafny.Rune> s = Dafny.Sequence<Dafny.Rune>.Empty;
+      Microsoft.Dafny.Compilers.WrapException.Throw();
+      s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Not Implemented Yet");
+      return s;
+    }
+  }
+} // end of namespace D2DPrettyPrinter
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/DAST.cs b/Source/DafnyCore/GeneratedFromDafny/DAST.cs
new file mode 100644
index 00000000000..9c382991c6a
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/DAST.cs
@@ -0,0 +1,6876 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace DAST {
+
+
+  public interface _IModule {
+    bool is_Module { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
+    bool dtor_isExtern { get; }
+    Dafny.ISequence<DAST._IModuleItem> dtor_body { get; }
+    _IModule DowncastClone();
+  }
+  public class Module : _IModule {
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public readonly bool _isExtern;
+    public readonly Dafny.ISequence<DAST._IModuleItem> _body;
+    public Module(Dafny.ISequence<Dafny.Rune> name, bool isExtern, Dafny.ISequence<DAST._IModuleItem> body) {
+      this._name = name;
+      this._isExtern = isExtern;
+      this._body = body;
+    }
+    public _IModule DowncastClone() {
+      if (this is _IModule dt) { return dt; }
+      return new Module(_name, _isExtern, _body);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Module;
+      return oth != null && object.Equals(this._name, oth._name) && this._isExtern == oth._isExtern && object.Equals(this._body, oth._body);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._isExtern));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Module.Module";
+      s += "(";
+      s += this._name.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._isExtern);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._body);
+      s += ")";
+      return s;
+    }
+    private static readonly DAST._IModule theDefault = create(Dafny.Sequence<Dafny.Rune>.Empty, false, Dafny.Sequence<DAST._IModuleItem>.Empty);
+    public static DAST._IModule Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DAST._IModule> _TYPE = new Dafny.TypeDescriptor<DAST._IModule>(DAST.Module.Default());
+    public static Dafny.TypeDescriptor<DAST._IModule> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IModule create(Dafny.ISequence<Dafny.Rune> name, bool isExtern, Dafny.ISequence<DAST._IModuleItem> body) {
+      return new Module(name, isExtern, body);
+    }
+    public static _IModule create_Module(Dafny.ISequence<Dafny.Rune> name, bool isExtern, Dafny.ISequence<DAST._IModuleItem> body) {
+      return create(name, isExtern, body);
+    }
+    public bool is_Module { get { return true; } }
+    public Dafny.ISequence<Dafny.Rune> dtor_name {
+      get {
+        return this._name;
+      }
+    }
+    public bool dtor_isExtern {
+      get {
+        return this._isExtern;
+      }
+    }
+    public Dafny.ISequence<DAST._IModuleItem> dtor_body {
+      get {
+        return this._body;
+      }
+    }
+  }
+
+  public interface _IModuleItem {
+    bool is_Module { get; }
+    bool is_Class { get; }
+    bool is_Trait { get; }
+    bool is_Newtype { get; }
+    bool is_Datatype { get; }
+    DAST._IModule dtor_Module_a0 { get; }
+    DAST._IClass dtor_Class_a0 { get; }
+    DAST._ITrait dtor_Trait_a0 { get; }
+    DAST._INewtype dtor_Newtype_a0 { get; }
+    DAST._IDatatype dtor_Datatype_a0 { get; }
+    _IModuleItem DowncastClone();
+  }
+  public abstract class ModuleItem : _IModuleItem {
+    public ModuleItem() {
+    }
+    private static readonly DAST._IModuleItem theDefault = create_Module(DAST.Module.Default());
+    public static DAST._IModuleItem Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DAST._IModuleItem> _TYPE = new Dafny.TypeDescriptor<DAST._IModuleItem>(DAST.ModuleItem.Default());
+    public static Dafny.TypeDescriptor<DAST._IModuleItem> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IModuleItem create_Module(DAST._IModule _a0) {
+      return new ModuleItem_Module(_a0);
+    }
+    public static _IModuleItem create_Class(DAST._IClass _a0) {
+      return new ModuleItem_Class(_a0);
+    }
+    public static _IModuleItem create_Trait(DAST._ITrait _a0) {
+      return new ModuleItem_Trait(_a0);
+    }
+    public static _IModuleItem create_Newtype(DAST._INewtype _a0) {
+      return new ModuleItem_Newtype(_a0);
+    }
+    public static _IModuleItem create_Datatype(DAST._IDatatype _a0) {
+      return new ModuleItem_Datatype(_a0);
+    }
+    public bool is_Module { get { return this is ModuleItem_Module; } }
+    public bool is_Class { get { return this is ModuleItem_Class; } }
+    public bool is_Trait { get { return this is ModuleItem_Trait; } }
+    public bool is_Newtype { get { return this is ModuleItem_Newtype; } }
+    public bool is_Datatype { get { return this is ModuleItem_Datatype; } }
+    public DAST._IModule dtor_Module_a0 {
+      get {
+        var d = this;
+        return ((ModuleItem_Module)d)._a0;
+      }
+    }
+    public DAST._IClass dtor_Class_a0 {
+      get {
+        var d = this;
+        return ((ModuleItem_Class)d)._a0;
+      }
+    }
+    public DAST._ITrait dtor_Trait_a0 {
+      get {
+        var d = this;
+        return ((ModuleItem_Trait)d)._a0;
+      }
+    }
+    public DAST._INewtype dtor_Newtype_a0 {
+      get {
+        var d = this;
+        return ((ModuleItem_Newtype)d)._a0;
+      }
+    }
+    public DAST._IDatatype dtor_Datatype_a0 {
+      get {
+        var d = this;
+        return ((ModuleItem_Datatype)d)._a0;
+      }
+    }
+    public abstract _IModuleItem DowncastClone();
+  }
+  public class ModuleItem_Module : ModuleItem {
+    public readonly DAST._IModule _a0;
+    public ModuleItem_Module(DAST._IModule _a0) : base() {
+      this._a0 = _a0;
+    }
+    public override _IModuleItem DowncastClone() {
+      if (this is _IModuleItem dt) { return dt; }
+      return new ModuleItem_Module(_a0);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.ModuleItem_Module;
+      return oth != null && object.Equals(this._a0, oth._a0);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.ModuleItem.Module";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._a0);
+      s += ")";
+      return s;
+    }
+  }
+  public class ModuleItem_Class : ModuleItem {
+    public readonly DAST._IClass _a0;
+    public ModuleItem_Class(DAST._IClass _a0) : base() {
+      this._a0 = _a0;
+    }
+    public override _IModuleItem DowncastClone() {
+      if (this is _IModuleItem dt) { return dt; }
+      return new ModuleItem_Class(_a0);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.ModuleItem_Class;
+      return oth != null && object.Equals(this._a0, oth._a0);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.ModuleItem.Class";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._a0);
+      s += ")";
+      return s;
+    }
+  }
+  public class ModuleItem_Trait : ModuleItem {
+    public readonly DAST._ITrait _a0;
+    public ModuleItem_Trait(DAST._ITrait _a0) : base() {
+      this._a0 = _a0;
+    }
+    public override _IModuleItem DowncastClone() {
+      if (this is _IModuleItem dt) { return dt; }
+      return new ModuleItem_Trait(_a0);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.ModuleItem_Trait;
+      return oth != null && object.Equals(this._a0, oth._a0);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 2;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.ModuleItem.Trait";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._a0);
+      s += ")";
+      return s;
+    }
+  }
+  public class ModuleItem_Newtype : ModuleItem {
+    public readonly DAST._INewtype _a0;
+    public ModuleItem_Newtype(DAST._INewtype _a0) : base() {
+      this._a0 = _a0;
+    }
+    public override _IModuleItem DowncastClone() {
+      if (this is _IModuleItem dt) { return dt; }
+      return new ModuleItem_Newtype(_a0);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.ModuleItem_Newtype;
+      return oth != null && object.Equals(this._a0, oth._a0);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 3;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.ModuleItem.Newtype";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._a0);
+      s += ")";
+      return s;
+    }
+  }
+  public class ModuleItem_Datatype : ModuleItem {
+    public readonly DAST._IDatatype _a0;
+    public ModuleItem_Datatype(DAST._IDatatype _a0) : base() {
+      this._a0 = _a0;
+    }
+    public override _IModuleItem DowncastClone() {
+      if (this is _IModuleItem dt) { return dt; }
+      return new ModuleItem_Datatype(_a0);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.ModuleItem_Datatype;
+      return oth != null && object.Equals(this._a0, oth._a0);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 4;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.ModuleItem.Datatype";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._a0);
+      s += ")";
+      return s;
+    }
+  }
+
+  public interface _IType {
+    bool is_Path { get; }
+    bool is_Nullable { get; }
+    bool is_Tuple { get; }
+    bool is_Array { get; }
+    bool is_Seq { get; }
+    bool is_Set { get; }
+    bool is_Multiset { get; }
+    bool is_Map { get; }
+    bool is_SetBuilder { get; }
+    bool is_MapBuilder { get; }
+    bool is_Arrow { get; }
+    bool is_Primitive { get; }
+    bool is_Passthrough { get; }
+    bool is_TypeArg { get; }
+    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_Path_a0 { get; }
+    Dafny.ISequence<DAST._IType> dtor_typeArgs { get; }
+    DAST._IResolvedType dtor_resolved { get; }
+    DAST._IType dtor_Nullable_a0 { get; }
+    Dafny.ISequence<DAST._IType> dtor_Tuple_a0 { get; }
+    DAST._IType dtor_element { get; }
+    BigInteger dtor_dims { get; }
+    DAST._IType dtor_key { get; }
+    DAST._IType dtor_value { get; }
+    Dafny.ISequence<DAST._IType> dtor_args { get; }
+    DAST._IType dtor_result { get; }
+    DAST._IPrimitive dtor_Primitive_a0 { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_Passthrough_a0 { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_TypeArg_a0 { get; }
+    _IType DowncastClone();
+  }
+  public abstract class Type : _IType {
+    public Type() {
+    }
+    private static readonly DAST._IType theDefault = create_Path(Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Empty, Dafny.Sequence<DAST._IType>.Empty, DAST.ResolvedType.Default());
+    public static DAST._IType Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DAST._IType> _TYPE = new Dafny.TypeDescriptor<DAST._IType>(DAST.Type.Default());
+    public static Dafny.TypeDescriptor<DAST._IType> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IType create_Path(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _a0, Dafny.ISequence<DAST._IType> typeArgs, DAST._IResolvedType resolved) {
+      return new Type_Path(_a0, typeArgs, resolved);
+    }
+    public static _IType create_Nullable(DAST._IType _a0) {
+      return new Type_Nullable(_a0);
+    }
+    public static _IType create_Tuple(Dafny.ISequence<DAST._IType> _a0) {
+      return new Type_Tuple(_a0);
+    }
+    public static _IType create_Array(DAST._IType element, BigInteger dims) {
+      return new Type_Array(element, dims);
+    }
+    public static _IType create_Seq(DAST._IType element) {
+      return new Type_Seq(element);
+    }
+    public static _IType create_Set(DAST._IType element) {
+      return new Type_Set(element);
+    }
+    public static _IType create_Multiset(DAST._IType element) {
+      return new Type_Multiset(element);
+    }
+    public static _IType create_Map(DAST._IType key, DAST._IType @value) {
+      return new Type_Map(key, @value);
+    }
+    public static _IType create_SetBuilder(DAST._IType element) {
+      return new Type_SetBuilder(element);
+    }
+    public static _IType create_MapBuilder(DAST._IType key, DAST._IType @value) {
+      return new Type_MapBuilder(key, @value);
+    }
+    public static _IType create_Arrow(Dafny.ISequence<DAST._IType> args, DAST._IType result) {
+      return new Type_Arrow(args, result);
+    }
+    public static _IType create_Primitive(DAST._IPrimitive _a0) {
+      return new Type_Primitive(_a0);
+    }
+    public static _IType create_Passthrough(Dafny.ISequence<Dafny.Rune> _a0) {
+      return new Type_Passthrough(_a0);
+    }
+    public static _IType create_TypeArg(Dafny.ISequence<Dafny.Rune> _a0) {
+      return new Type_TypeArg(_a0);
+    }
+    public bool is_Path { get { return this is Type_Path; } }
+    public bool is_Nullable { get { return this is Type_Nullable; } }
+    public bool is_Tuple { get { return this is Type_Tuple; } }
+    public bool is_Array { get { return this is Type_Array; } }
+    public bool is_Seq { get { return this is Type_Seq; } }
+    public bool is_Set { get { return this is Type_Set; } }
+    public bool is_Multiset { get { return this is Type_Multiset; } }
+    public bool is_Map { get { return this is Type_Map; } }
+    public bool is_SetBuilder { get { return this is Type_SetBuilder; } }
+    public bool is_MapBuilder { get { return this is Type_MapBuilder; } }
+    public bool is_Arrow { get { return this is Type_Arrow; } }
+    public bool is_Primitive { get { return this is Type_Primitive; } }
+    public bool is_Passthrough { get { return this is Type_Passthrough; } }
+    public bool is_TypeArg { get { return this is Type_TypeArg; } }
+    public Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_Path_a0 {
+      get {
+        var d = this;
+        return ((Type_Path)d)._a0;
+      }
+    }
+    public Dafny.ISequence<DAST._IType> dtor_typeArgs {
+      get {
+        var d = this;
+        return ((Type_Path)d)._typeArgs;
+      }
+    }
+    public DAST._IResolvedType dtor_resolved {
+      get {
+        var d = this;
+        return ((Type_Path)d)._resolved;
+      }
+    }
+    public DAST._IType dtor_Nullable_a0 {
+      get {
+        var d = this;
+        return ((Type_Nullable)d)._a0;
+      }
+    }
+    public Dafny.ISequence<DAST._IType> dtor_Tuple_a0 {
+      get {
+        var d = this;
+        return ((Type_Tuple)d)._a0;
+      }
+    }
+    public DAST._IType dtor_element {
+      get {
+        var d = this;
+        if (d is Type_Array) { return ((Type_Array)d)._element; }
+        if (d is Type_Seq) { return ((Type_Seq)d)._element; }
+        if (d is Type_Set) { return ((Type_Set)d)._element; }
+        if (d is Type_Multiset) { return ((Type_Multiset)d)._element; }
+        return ((Type_SetBuilder)d)._element;
+      }
+    }
+    public BigInteger dtor_dims {
+      get {
+        var d = this;
+        return ((Type_Array)d)._dims;
+      }
+    }
+    public DAST._IType dtor_key {
+      get {
+        var d = this;
+        if (d is Type_Map) { return ((Type_Map)d)._key; }
+        return ((Type_MapBuilder)d)._key;
+      }
+    }
+    public DAST._IType dtor_value {
+      get {
+        var d = this;
+        if (d is Type_Map) { return ((Type_Map)d)._value; }
+        return ((Type_MapBuilder)d)._value;
+      }
+    }
+    public Dafny.ISequence<DAST._IType> dtor_args {
+      get {
+        var d = this;
+        return ((Type_Arrow)d)._args;
+      }
+    }
+    public DAST._IType dtor_result {
+      get {
+        var d = this;
+        return ((Type_Arrow)d)._result;
+      }
+    }
+    public DAST._IPrimitive dtor_Primitive_a0 {
+      get {
+        var d = this;
+        return ((Type_Primitive)d)._a0;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_Passthrough_a0 {
+      get {
+        var d = this;
+        return ((Type_Passthrough)d)._a0;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_TypeArg_a0 {
+      get {
+        var d = this;
+        return ((Type_TypeArg)d)._a0;
+      }
+    }
+    public abstract _IType DowncastClone();
+  }
+  public class Type_Path : Type {
+    public readonly Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _a0;
+    public readonly Dafny.ISequence<DAST._IType> _typeArgs;
+    public readonly DAST._IResolvedType _resolved;
+    public Type_Path(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _a0, Dafny.ISequence<DAST._IType> typeArgs, DAST._IResolvedType resolved) : base() {
+      this._a0 = _a0;
+      this._typeArgs = typeArgs;
+      this._resolved = resolved;
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_Path(_a0, _typeArgs, _resolved);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Type_Path;
+      return oth != null && object.Equals(this._a0, oth._a0) && object.Equals(this._typeArgs, oth._typeArgs) && object.Equals(this._resolved, oth._resolved);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeArgs));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._resolved));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Type.Path";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._a0);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._typeArgs);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._resolved);
+      s += ")";
+      return s;
+    }
+  }
+  public class Type_Nullable : Type {
+    public readonly DAST._IType _a0;
+    public Type_Nullable(DAST._IType _a0) : base() {
+      this._a0 = _a0;
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_Nullable(_a0);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Type_Nullable;
+      return oth != null && object.Equals(this._a0, oth._a0);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Type.Nullable";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._a0);
+      s += ")";
+      return s;
+    }
+  }
+  public class Type_Tuple : Type {
+    public readonly Dafny.ISequence<DAST._IType> _a0;
+    public Type_Tuple(Dafny.ISequence<DAST._IType> _a0) : base() {
+      this._a0 = _a0;
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_Tuple(_a0);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Type_Tuple;
+      return oth != null && object.Equals(this._a0, oth._a0);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 2;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Type.Tuple";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._a0);
+      s += ")";
+      return s;
+    }
+  }
+  public class Type_Array : Type {
+    public readonly DAST._IType _element;
+    public readonly BigInteger _dims;
+    public Type_Array(DAST._IType element, BigInteger dims) : base() {
+      this._element = element;
+      this._dims = dims;
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_Array(_element, _dims);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Type_Array;
+      return oth != null && object.Equals(this._element, oth._element) && this._dims == oth._dims;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 3;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._element));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._dims));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Type.Array";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._element);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._dims);
+      s += ")";
+      return s;
+    }
+  }
+  public class Type_Seq : Type {
+    public readonly DAST._IType _element;
+    public Type_Seq(DAST._IType element) : base() {
+      this._element = element;
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_Seq(_element);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Type_Seq;
+      return oth != null && object.Equals(this._element, oth._element);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 4;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._element));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Type.Seq";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._element);
+      s += ")";
+      return s;
+    }
+  }
+  public class Type_Set : Type {
+    public readonly DAST._IType _element;
+    public Type_Set(DAST._IType element) : base() {
+      this._element = element;
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_Set(_element);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Type_Set;
+      return oth != null && object.Equals(this._element, oth._element);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 5;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._element));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Type.Set";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._element);
+      s += ")";
+      return s;
+    }
+  }
+  public class Type_Multiset : Type {
+    public readonly DAST._IType _element;
+    public Type_Multiset(DAST._IType element) : base() {
+      this._element = element;
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_Multiset(_element);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Type_Multiset;
+      return oth != null && object.Equals(this._element, oth._element);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 6;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._element));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Type.Multiset";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._element);
+      s += ")";
+      return s;
+    }
+  }
+  public class Type_Map : Type {
+    public readonly DAST._IType _key;
+    public readonly DAST._IType _value;
+    public Type_Map(DAST._IType key, DAST._IType @value) : base() {
+      this._key = key;
+      this._value = @value;
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_Map(_key, _value);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Type_Map;
+      return oth != null && object.Equals(this._key, oth._key) && object.Equals(this._value, oth._value);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 7;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._key));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._value));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Type.Map";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._key);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._value);
+      s += ")";
+      return s;
+    }
+  }
+  public class Type_SetBuilder : Type {
+    public readonly DAST._IType _element;
+    public Type_SetBuilder(DAST._IType element) : base() {
+      this._element = element;
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_SetBuilder(_element);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Type_SetBuilder;
+      return oth != null && object.Equals(this._element, oth._element);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 8;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._element));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Type.SetBuilder";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._element);
+      s += ")";
+      return s;
+    }
+  }
+  public class Type_MapBuilder : Type {
+    public readonly DAST._IType _key;
+    public readonly DAST._IType _value;
+    public Type_MapBuilder(DAST._IType key, DAST._IType @value) : base() {
+      this._key = key;
+      this._value = @value;
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_MapBuilder(_key, _value);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Type_MapBuilder;
+      return oth != null && object.Equals(this._key, oth._key) && object.Equals(this._value, oth._value);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 9;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._key));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._value));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Type.MapBuilder";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._key);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._value);
+      s += ")";
+      return s;
+    }
+  }
+  public class Type_Arrow : Type {
+    public readonly Dafny.ISequence<DAST._IType> _args;
+    public readonly DAST._IType _result;
+    public Type_Arrow(Dafny.ISequence<DAST._IType> args, DAST._IType result) : base() {
+      this._args = args;
+      this._result = result;
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_Arrow(_args, _result);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Type_Arrow;
+      return oth != null && object.Equals(this._args, oth._args) && object.Equals(this._result, oth._result);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 10;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._args));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._result));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Type.Arrow";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._args);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._result);
+      s += ")";
+      return s;
+    }
+  }
+  public class Type_Primitive : Type {
+    public readonly DAST._IPrimitive _a0;
+    public Type_Primitive(DAST._IPrimitive _a0) : base() {
+      this._a0 = _a0;
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_Primitive(_a0);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Type_Primitive;
+      return oth != null && object.Equals(this._a0, oth._a0);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 11;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Type.Primitive";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._a0);
+      s += ")";
+      return s;
+    }
+  }
+  public class Type_Passthrough : Type {
+    public readonly Dafny.ISequence<Dafny.Rune> _a0;
+    public Type_Passthrough(Dafny.ISequence<Dafny.Rune> _a0) : base() {
+      this._a0 = _a0;
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_Passthrough(_a0);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Type_Passthrough;
+      return oth != null && object.Equals(this._a0, oth._a0);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 12;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Type.Passthrough";
+      s += "(";
+      s += this._a0.ToVerbatimString(true);
+      s += ")";
+      return s;
+    }
+  }
+  public class Type_TypeArg : Type {
+    public readonly Dafny.ISequence<Dafny.Rune> _a0;
+    public Type_TypeArg(Dafny.ISequence<Dafny.Rune> _a0) : base() {
+      this._a0 = _a0;
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_TypeArg(_a0);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Type_TypeArg;
+      return oth != null && object.Equals(this._a0, oth._a0);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 13;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Type.TypeArg";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._a0);
+      s += ")";
+      return s;
+    }
+  }
+
+  public interface _IPrimitive {
+    bool is_Int { get; }
+    bool is_Real { get; }
+    bool is_String { get; }
+    bool is_Bool { get; }
+    bool is_Char { get; }
+    _IPrimitive DowncastClone();
+  }
+  public abstract class Primitive : _IPrimitive {
+    public Primitive() {
+    }
+    private static readonly DAST._IPrimitive theDefault = create_Int();
+    public static DAST._IPrimitive Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DAST._IPrimitive> _TYPE = new Dafny.TypeDescriptor<DAST._IPrimitive>(DAST.Primitive.Default());
+    public static Dafny.TypeDescriptor<DAST._IPrimitive> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IPrimitive create_Int() {
+      return new Primitive_Int();
+    }
+    public static _IPrimitive create_Real() {
+      return new Primitive_Real();
+    }
+    public static _IPrimitive create_String() {
+      return new Primitive_String();
+    }
+    public static _IPrimitive create_Bool() {
+      return new Primitive_Bool();
+    }
+    public static _IPrimitive create_Char() {
+      return new Primitive_Char();
+    }
+    public bool is_Int { get { return this is Primitive_Int; } }
+    public bool is_Real { get { return this is Primitive_Real; } }
+    public bool is_String { get { return this is Primitive_String; } }
+    public bool is_Bool { get { return this is Primitive_Bool; } }
+    public bool is_Char { get { return this is Primitive_Char; } }
+    public static System.Collections.Generic.IEnumerable<_IPrimitive> AllSingletonConstructors {
+      get {
+        yield return Primitive.create_Int();
+        yield return Primitive.create_Real();
+        yield return Primitive.create_String();
+        yield return Primitive.create_Bool();
+        yield return Primitive.create_Char();
+      }
+    }
+    public abstract _IPrimitive DowncastClone();
+  }
+  public class Primitive_Int : Primitive {
+    public Primitive_Int() : base() {
+    }
+    public override _IPrimitive DowncastClone() {
+      if (this is _IPrimitive dt) { return dt; }
+      return new Primitive_Int();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Primitive_Int;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Primitive.Int";
+      return s;
+    }
+  }
+  public class Primitive_Real : Primitive {
+    public Primitive_Real() : base() {
+    }
+    public override _IPrimitive DowncastClone() {
+      if (this is _IPrimitive dt) { return dt; }
+      return new Primitive_Real();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Primitive_Real;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Primitive.Real";
+      return s;
+    }
+  }
+  public class Primitive_String : Primitive {
+    public Primitive_String() : base() {
+    }
+    public override _IPrimitive DowncastClone() {
+      if (this is _IPrimitive dt) { return dt; }
+      return new Primitive_String();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Primitive_String;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 2;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Primitive.String";
+      return s;
+    }
+  }
+  public class Primitive_Bool : Primitive {
+    public Primitive_Bool() : base() {
+    }
+    public override _IPrimitive DowncastClone() {
+      if (this is _IPrimitive dt) { return dt; }
+      return new Primitive_Bool();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Primitive_Bool;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 3;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Primitive.Bool";
+      return s;
+    }
+  }
+  public class Primitive_Char : Primitive {
+    public Primitive_Char() : base() {
+    }
+    public override _IPrimitive DowncastClone() {
+      if (this is _IPrimitive dt) { return dt; }
+      return new Primitive_Char();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Primitive_Char;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 4;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Primitive.Char";
+      return s;
+    }
+  }
+
+  public interface _INewtypeRange {
+    bool is_U8 { get; }
+    bool is_I8 { get; }
+    bool is_U16 { get; }
+    bool is_I16 { get; }
+    bool is_U32 { get; }
+    bool is_I32 { get; }
+    bool is_U64 { get; }
+    bool is_I64 { get; }
+    bool is_U128 { get; }
+    bool is_I128 { get; }
+    bool is_BigInt { get; }
+    bool is_NoRange { get; }
+    _INewtypeRange DowncastClone();
+  }
+  public abstract class NewtypeRange : _INewtypeRange {
+    public NewtypeRange() {
+    }
+    private static readonly DAST._INewtypeRange theDefault = create_U8();
+    public static DAST._INewtypeRange Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DAST._INewtypeRange> _TYPE = new Dafny.TypeDescriptor<DAST._INewtypeRange>(DAST.NewtypeRange.Default());
+    public static Dafny.TypeDescriptor<DAST._INewtypeRange> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _INewtypeRange create_U8() {
+      return new NewtypeRange_U8();
+    }
+    public static _INewtypeRange create_I8() {
+      return new NewtypeRange_I8();
+    }
+    public static _INewtypeRange create_U16() {
+      return new NewtypeRange_U16();
+    }
+    public static _INewtypeRange create_I16() {
+      return new NewtypeRange_I16();
+    }
+    public static _INewtypeRange create_U32() {
+      return new NewtypeRange_U32();
+    }
+    public static _INewtypeRange create_I32() {
+      return new NewtypeRange_I32();
+    }
+    public static _INewtypeRange create_U64() {
+      return new NewtypeRange_U64();
+    }
+    public static _INewtypeRange create_I64() {
+      return new NewtypeRange_I64();
+    }
+    public static _INewtypeRange create_U128() {
+      return new NewtypeRange_U128();
+    }
+    public static _INewtypeRange create_I128() {
+      return new NewtypeRange_I128();
+    }
+    public static _INewtypeRange create_BigInt() {
+      return new NewtypeRange_BigInt();
+    }
+    public static _INewtypeRange create_NoRange() {
+      return new NewtypeRange_NoRange();
+    }
+    public bool is_U8 { get { return this is NewtypeRange_U8; } }
+    public bool is_I8 { get { return this is NewtypeRange_I8; } }
+    public bool is_U16 { get { return this is NewtypeRange_U16; } }
+    public bool is_I16 { get { return this is NewtypeRange_I16; } }
+    public bool is_U32 { get { return this is NewtypeRange_U32; } }
+    public bool is_I32 { get { return this is NewtypeRange_I32; } }
+    public bool is_U64 { get { return this is NewtypeRange_U64; } }
+    public bool is_I64 { get { return this is NewtypeRange_I64; } }
+    public bool is_U128 { get { return this is NewtypeRange_U128; } }
+    public bool is_I128 { get { return this is NewtypeRange_I128; } }
+    public bool is_BigInt { get { return this is NewtypeRange_BigInt; } }
+    public bool is_NoRange { get { return this is NewtypeRange_NoRange; } }
+    public static System.Collections.Generic.IEnumerable<_INewtypeRange> AllSingletonConstructors {
+      get {
+        yield return NewtypeRange.create_U8();
+        yield return NewtypeRange.create_I8();
+        yield return NewtypeRange.create_U16();
+        yield return NewtypeRange.create_I16();
+        yield return NewtypeRange.create_U32();
+        yield return NewtypeRange.create_I32();
+        yield return NewtypeRange.create_U64();
+        yield return NewtypeRange.create_I64();
+        yield return NewtypeRange.create_U128();
+        yield return NewtypeRange.create_I128();
+        yield return NewtypeRange.create_BigInt();
+        yield return NewtypeRange.create_NoRange();
+      }
+    }
+    public abstract _INewtypeRange DowncastClone();
+  }
+  public class NewtypeRange_U8 : NewtypeRange {
+    public NewtypeRange_U8() : base() {
+    }
+    public override _INewtypeRange DowncastClone() {
+      if (this is _INewtypeRange dt) { return dt; }
+      return new NewtypeRange_U8();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.NewtypeRange_U8;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.NewtypeRange.U8";
+      return s;
+    }
+  }
+  public class NewtypeRange_I8 : NewtypeRange {
+    public NewtypeRange_I8() : base() {
+    }
+    public override _INewtypeRange DowncastClone() {
+      if (this is _INewtypeRange dt) { return dt; }
+      return new NewtypeRange_I8();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.NewtypeRange_I8;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.NewtypeRange.I8";
+      return s;
+    }
+  }
+  public class NewtypeRange_U16 : NewtypeRange {
+    public NewtypeRange_U16() : base() {
+    }
+    public override _INewtypeRange DowncastClone() {
+      if (this is _INewtypeRange dt) { return dt; }
+      return new NewtypeRange_U16();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.NewtypeRange_U16;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 2;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.NewtypeRange.U16";
+      return s;
+    }
+  }
+  public class NewtypeRange_I16 : NewtypeRange {
+    public NewtypeRange_I16() : base() {
+    }
+    public override _INewtypeRange DowncastClone() {
+      if (this is _INewtypeRange dt) { return dt; }
+      return new NewtypeRange_I16();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.NewtypeRange_I16;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 3;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.NewtypeRange.I16";
+      return s;
+    }
+  }
+  public class NewtypeRange_U32 : NewtypeRange {
+    public NewtypeRange_U32() : base() {
+    }
+    public override _INewtypeRange DowncastClone() {
+      if (this is _INewtypeRange dt) { return dt; }
+      return new NewtypeRange_U32();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.NewtypeRange_U32;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 4;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.NewtypeRange.U32";
+      return s;
+    }
+  }
+  public class NewtypeRange_I32 : NewtypeRange {
+    public NewtypeRange_I32() : base() {
+    }
+    public override _INewtypeRange DowncastClone() {
+      if (this is _INewtypeRange dt) { return dt; }
+      return new NewtypeRange_I32();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.NewtypeRange_I32;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 5;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.NewtypeRange.I32";
+      return s;
+    }
+  }
+  public class NewtypeRange_U64 : NewtypeRange {
+    public NewtypeRange_U64() : base() {
+    }
+    public override _INewtypeRange DowncastClone() {
+      if (this is _INewtypeRange dt) { return dt; }
+      return new NewtypeRange_U64();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.NewtypeRange_U64;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 6;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.NewtypeRange.U64";
+      return s;
+    }
+  }
+  public class NewtypeRange_I64 : NewtypeRange {
+    public NewtypeRange_I64() : base() {
+    }
+    public override _INewtypeRange DowncastClone() {
+      if (this is _INewtypeRange dt) { return dt; }
+      return new NewtypeRange_I64();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.NewtypeRange_I64;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 7;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.NewtypeRange.I64";
+      return s;
+    }
+  }
+  public class NewtypeRange_U128 : NewtypeRange {
+    public NewtypeRange_U128() : base() {
+    }
+    public override _INewtypeRange DowncastClone() {
+      if (this is _INewtypeRange dt) { return dt; }
+      return new NewtypeRange_U128();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.NewtypeRange_U128;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 8;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.NewtypeRange.U128";
+      return s;
+    }
+  }
+  public class NewtypeRange_I128 : NewtypeRange {
+    public NewtypeRange_I128() : base() {
+    }
+    public override _INewtypeRange DowncastClone() {
+      if (this is _INewtypeRange dt) { return dt; }
+      return new NewtypeRange_I128();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.NewtypeRange_I128;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 9;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.NewtypeRange.I128";
+      return s;
+    }
+  }
+  public class NewtypeRange_BigInt : NewtypeRange {
+    public NewtypeRange_BigInt() : base() {
+    }
+    public override _INewtypeRange DowncastClone() {
+      if (this is _INewtypeRange dt) { return dt; }
+      return new NewtypeRange_BigInt();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.NewtypeRange_BigInt;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 10;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.NewtypeRange.BigInt";
+      return s;
+    }
+  }
+  public class NewtypeRange_NoRange : NewtypeRange {
+    public NewtypeRange_NoRange() : base() {
+    }
+    public override _INewtypeRange DowncastClone() {
+      if (this is _INewtypeRange dt) { return dt; }
+      return new NewtypeRange_NoRange();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.NewtypeRange_NoRange;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 11;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.NewtypeRange.NoRange";
+      return s;
+    }
+  }
+
+  public interface _IResolvedType {
+    bool is_Datatype { get; }
+    bool is_Trait { get; }
+    bool is_Newtype { get; }
+    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_path { get; }
+    DAST._IType dtor_baseType { get; }
+    DAST._INewtypeRange dtor_range { get; }
+    bool dtor_erase { get; }
+    _IResolvedType DowncastClone();
+  }
+  public abstract class ResolvedType : _IResolvedType {
+    public ResolvedType() {
+    }
+    private static readonly DAST._IResolvedType theDefault = create_Datatype(Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Empty);
+    public static DAST._IResolvedType Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DAST._IResolvedType> _TYPE = new Dafny.TypeDescriptor<DAST._IResolvedType>(DAST.ResolvedType.Default());
+    public static Dafny.TypeDescriptor<DAST._IResolvedType> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IResolvedType create_Datatype(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> path) {
+      return new ResolvedType_Datatype(path);
+    }
+    public static _IResolvedType create_Trait(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> path) {
+      return new ResolvedType_Trait(path);
+    }
+    public static _IResolvedType create_Newtype(DAST._IType baseType, DAST._INewtypeRange range, bool erase) {
+      return new ResolvedType_Newtype(baseType, range, erase);
+    }
+    public bool is_Datatype { get { return this is ResolvedType_Datatype; } }
+    public bool is_Trait { get { return this is ResolvedType_Trait; } }
+    public bool is_Newtype { get { return this is ResolvedType_Newtype; } }
+    public Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_path {
+      get {
+        var d = this;
+        if (d is ResolvedType_Datatype) { return ((ResolvedType_Datatype)d)._path; }
+        return ((ResolvedType_Trait)d)._path;
+      }
+    }
+    public DAST._IType dtor_baseType {
+      get {
+        var d = this;
+        return ((ResolvedType_Newtype)d)._baseType;
+      }
+    }
+    public DAST._INewtypeRange dtor_range {
+      get {
+        var d = this;
+        return ((ResolvedType_Newtype)d)._range;
+      }
+    }
+    public bool dtor_erase {
+      get {
+        var d = this;
+        return ((ResolvedType_Newtype)d)._erase;
+      }
+    }
+    public abstract _IResolvedType DowncastClone();
+  }
+  public class ResolvedType_Datatype : ResolvedType {
+    public readonly Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _path;
+    public ResolvedType_Datatype(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> path) : base() {
+      this._path = path;
+    }
+    public override _IResolvedType DowncastClone() {
+      if (this is _IResolvedType dt) { return dt; }
+      return new ResolvedType_Datatype(_path);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.ResolvedType_Datatype;
+      return oth != null && object.Equals(this._path, oth._path);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._path));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.ResolvedType.Datatype";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._path);
+      s += ")";
+      return s;
+    }
+  }
+  public class ResolvedType_Trait : ResolvedType {
+    public readonly Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _path;
+    public ResolvedType_Trait(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> path) : base() {
+      this._path = path;
+    }
+    public override _IResolvedType DowncastClone() {
+      if (this is _IResolvedType dt) { return dt; }
+      return new ResolvedType_Trait(_path);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.ResolvedType_Trait;
+      return oth != null && object.Equals(this._path, oth._path);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._path));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.ResolvedType.Trait";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._path);
+      s += ")";
+      return s;
+    }
+  }
+  public class ResolvedType_Newtype : ResolvedType {
+    public readonly DAST._IType _baseType;
+    public readonly DAST._INewtypeRange _range;
+    public readonly bool _erase;
+    public ResolvedType_Newtype(DAST._IType baseType, DAST._INewtypeRange range, bool erase) : base() {
+      this._baseType = baseType;
+      this._range = range;
+      this._erase = erase;
+    }
+    public override _IResolvedType DowncastClone() {
+      if (this is _IResolvedType dt) { return dt; }
+      return new ResolvedType_Newtype(_baseType, _range, _erase);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.ResolvedType_Newtype;
+      return oth != null && object.Equals(this._baseType, oth._baseType) && object.Equals(this._range, oth._range) && this._erase == oth._erase;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 2;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._baseType));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._range));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._erase));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.ResolvedType.Newtype";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._baseType);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._range);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._erase);
+      s += ")";
+      return s;
+    }
+  }
+
+  public interface _IIdent {
+    bool is_Ident { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_id { get; }
+  }
+  public class Ident : _IIdent {
+    public readonly Dafny.ISequence<Dafny.Rune> _id;
+    public Ident(Dafny.ISequence<Dafny.Rune> id) {
+      this._id = id;
+    }
+    public static Dafny.ISequence<Dafny.Rune> DowncastClone(Dafny.ISequence<Dafny.Rune> _this) {
+      return _this;
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Ident;
+      return oth != null && object.Equals(this._id, oth._id);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._id));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Ident.Ident";
+      s += "(";
+      s += this._id.ToVerbatimString(true);
+      s += ")";
+      return s;
+    }
+    private static readonly Dafny.ISequence<Dafny.Rune> theDefault = Dafny.Sequence<Dafny.Rune>.Empty;
+    public static Dafny.ISequence<Dafny.Rune> Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>> _TYPE = new Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>>(Dafny.Sequence<Dafny.Rune>.Empty);
+    public static Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IIdent create(Dafny.ISequence<Dafny.Rune> id) {
+      return new Ident(id);
+    }
+    public static _IIdent create_Ident(Dafny.ISequence<Dafny.Rune> id) {
+      return create(id);
+    }
+    public bool is_Ident { get { return true; } }
+    public Dafny.ISequence<Dafny.Rune> dtor_id {
+      get {
+        return this._id;
+      }
+    }
+  }
+
+  public interface _IClass {
+    bool is_Class { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_enclosingModule { get; }
+    Dafny.ISequence<DAST._IType> dtor_typeParams { get; }
+    Dafny.ISequence<DAST._IType> dtor_superClasses { get; }
+    Dafny.ISequence<DAST._IField> dtor_fields { get; }
+    Dafny.ISequence<DAST._IMethod> dtor_body { get; }
+    _IClass DowncastClone();
+  }
+  public class Class : _IClass {
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public readonly Dafny.ISequence<Dafny.Rune> _enclosingModule;
+    public readonly Dafny.ISequence<DAST._IType> _typeParams;
+    public readonly Dafny.ISequence<DAST._IType> _superClasses;
+    public readonly Dafny.ISequence<DAST._IField> _fields;
+    public readonly Dafny.ISequence<DAST._IMethod> _body;
+    public Class(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<Dafny.Rune> enclosingModule, Dafny.ISequence<DAST._IType> typeParams, Dafny.ISequence<DAST._IType> superClasses, Dafny.ISequence<DAST._IField> fields, Dafny.ISequence<DAST._IMethod> body) {
+      this._name = name;
+      this._enclosingModule = enclosingModule;
+      this._typeParams = typeParams;
+      this._superClasses = superClasses;
+      this._fields = fields;
+      this._body = body;
+    }
+    public _IClass DowncastClone() {
+      if (this is _IClass dt) { return dt; }
+      return new Class(_name, _enclosingModule, _typeParams, _superClasses, _fields, _body);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Class;
+      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._enclosingModule, oth._enclosingModule) && object.Equals(this._typeParams, oth._typeParams) && object.Equals(this._superClasses, oth._superClasses) && object.Equals(this._fields, oth._fields) && object.Equals(this._body, oth._body);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._enclosingModule));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeParams));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._superClasses));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._fields));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Class.Class";
+      s += "(";
+      s += this._name.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._enclosingModule);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._typeParams);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._superClasses);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._fields);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._body);
+      s += ")";
+      return s;
+    }
+    private static readonly DAST._IClass theDefault = create(Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<DAST._IType>.Empty, Dafny.Sequence<DAST._IType>.Empty, Dafny.Sequence<DAST._IField>.Empty, Dafny.Sequence<DAST._IMethod>.Empty);
+    public static DAST._IClass Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DAST._IClass> _TYPE = new Dafny.TypeDescriptor<DAST._IClass>(DAST.Class.Default());
+    public static Dafny.TypeDescriptor<DAST._IClass> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IClass create(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<Dafny.Rune> enclosingModule, Dafny.ISequence<DAST._IType> typeParams, Dafny.ISequence<DAST._IType> superClasses, Dafny.ISequence<DAST._IField> fields, Dafny.ISequence<DAST._IMethod> body) {
+      return new Class(name, enclosingModule, typeParams, superClasses, fields, body);
+    }
+    public static _IClass create_Class(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<Dafny.Rune> enclosingModule, Dafny.ISequence<DAST._IType> typeParams, Dafny.ISequence<DAST._IType> superClasses, Dafny.ISequence<DAST._IField> fields, Dafny.ISequence<DAST._IMethod> body) {
+      return create(name, enclosingModule, typeParams, superClasses, fields, body);
+    }
+    public bool is_Class { get { return true; } }
+    public Dafny.ISequence<Dafny.Rune> dtor_name {
+      get {
+        return this._name;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_enclosingModule {
+      get {
+        return this._enclosingModule;
+      }
+    }
+    public Dafny.ISequence<DAST._IType> dtor_typeParams {
+      get {
+        return this._typeParams;
+      }
+    }
+    public Dafny.ISequence<DAST._IType> dtor_superClasses {
+      get {
+        return this._superClasses;
+      }
+    }
+    public Dafny.ISequence<DAST._IField> dtor_fields {
+      get {
+        return this._fields;
+      }
+    }
+    public Dafny.ISequence<DAST._IMethod> dtor_body {
+      get {
+        return this._body;
+      }
+    }
+  }
+
+  public interface _ITrait {
+    bool is_Trait { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
+    Dafny.ISequence<DAST._IType> dtor_typeParams { get; }
+    Dafny.ISequence<DAST._IMethod> dtor_body { get; }
+    _ITrait DowncastClone();
+  }
+  public class Trait : _ITrait {
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public readonly Dafny.ISequence<DAST._IType> _typeParams;
+    public readonly Dafny.ISequence<DAST._IMethod> _body;
+    public Trait(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IType> typeParams, Dafny.ISequence<DAST._IMethod> body) {
+      this._name = name;
+      this._typeParams = typeParams;
+      this._body = body;
+    }
+    public _ITrait DowncastClone() {
+      if (this is _ITrait dt) { return dt; }
+      return new Trait(_name, _typeParams, _body);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Trait;
+      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._typeParams, oth._typeParams) && object.Equals(this._body, oth._body);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeParams));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Trait.Trait";
+      s += "(";
+      s += this._name.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._typeParams);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._body);
+      s += ")";
+      return s;
+    }
+    private static readonly DAST._ITrait theDefault = create(Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<DAST._IType>.Empty, Dafny.Sequence<DAST._IMethod>.Empty);
+    public static DAST._ITrait Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DAST._ITrait> _TYPE = new Dafny.TypeDescriptor<DAST._ITrait>(DAST.Trait.Default());
+    public static Dafny.TypeDescriptor<DAST._ITrait> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _ITrait create(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IType> typeParams, Dafny.ISequence<DAST._IMethod> body) {
+      return new Trait(name, typeParams, body);
+    }
+    public static _ITrait create_Trait(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IType> typeParams, Dafny.ISequence<DAST._IMethod> body) {
+      return create(name, typeParams, body);
+    }
+    public bool is_Trait { get { return true; } }
+    public Dafny.ISequence<Dafny.Rune> dtor_name {
+      get {
+        return this._name;
+      }
+    }
+    public Dafny.ISequence<DAST._IType> dtor_typeParams {
+      get {
+        return this._typeParams;
+      }
+    }
+    public Dafny.ISequence<DAST._IMethod> dtor_body {
+      get {
+        return this._body;
+      }
+    }
+  }
+
+  public interface _IDatatype {
+    bool is_Datatype { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_enclosingModule { get; }
+    Dafny.ISequence<DAST._IType> dtor_typeParams { get; }
+    Dafny.ISequence<DAST._IDatatypeCtor> dtor_ctors { get; }
+    Dafny.ISequence<DAST._IMethod> dtor_body { get; }
+    bool dtor_isCo { get; }
+    _IDatatype DowncastClone();
+  }
+  public class Datatype : _IDatatype {
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public readonly Dafny.ISequence<Dafny.Rune> _enclosingModule;
+    public readonly Dafny.ISequence<DAST._IType> _typeParams;
+    public readonly Dafny.ISequence<DAST._IDatatypeCtor> _ctors;
+    public readonly Dafny.ISequence<DAST._IMethod> _body;
+    public readonly bool _isCo;
+    public Datatype(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<Dafny.Rune> enclosingModule, Dafny.ISequence<DAST._IType> typeParams, Dafny.ISequence<DAST._IDatatypeCtor> ctors, Dafny.ISequence<DAST._IMethod> body, bool isCo) {
+      this._name = name;
+      this._enclosingModule = enclosingModule;
+      this._typeParams = typeParams;
+      this._ctors = ctors;
+      this._body = body;
+      this._isCo = isCo;
+    }
+    public _IDatatype DowncastClone() {
+      if (this is _IDatatype dt) { return dt; }
+      return new Datatype(_name, _enclosingModule, _typeParams, _ctors, _body, _isCo);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Datatype;
+      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._enclosingModule, oth._enclosingModule) && object.Equals(this._typeParams, oth._typeParams) && object.Equals(this._ctors, oth._ctors) && object.Equals(this._body, oth._body) && this._isCo == oth._isCo;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._enclosingModule));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeParams));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._ctors));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._isCo));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Datatype.Datatype";
+      s += "(";
+      s += this._name.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._enclosingModule);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._typeParams);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._ctors);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._body);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._isCo);
+      s += ")";
+      return s;
+    }
+    private static readonly DAST._IDatatype theDefault = create(Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<DAST._IType>.Empty, Dafny.Sequence<DAST._IDatatypeCtor>.Empty, Dafny.Sequence<DAST._IMethod>.Empty, false);
+    public static DAST._IDatatype Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DAST._IDatatype> _TYPE = new Dafny.TypeDescriptor<DAST._IDatatype>(DAST.Datatype.Default());
+    public static Dafny.TypeDescriptor<DAST._IDatatype> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IDatatype create(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<Dafny.Rune> enclosingModule, Dafny.ISequence<DAST._IType> typeParams, Dafny.ISequence<DAST._IDatatypeCtor> ctors, Dafny.ISequence<DAST._IMethod> body, bool isCo) {
+      return new Datatype(name, enclosingModule, typeParams, ctors, body, isCo);
+    }
+    public static _IDatatype create_Datatype(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<Dafny.Rune> enclosingModule, Dafny.ISequence<DAST._IType> typeParams, Dafny.ISequence<DAST._IDatatypeCtor> ctors, Dafny.ISequence<DAST._IMethod> body, bool isCo) {
+      return create(name, enclosingModule, typeParams, ctors, body, isCo);
+    }
+    public bool is_Datatype { get { return true; } }
+    public Dafny.ISequence<Dafny.Rune> dtor_name {
+      get {
+        return this._name;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_enclosingModule {
+      get {
+        return this._enclosingModule;
+      }
+    }
+    public Dafny.ISequence<DAST._IType> dtor_typeParams {
+      get {
+        return this._typeParams;
+      }
+    }
+    public Dafny.ISequence<DAST._IDatatypeCtor> dtor_ctors {
+      get {
+        return this._ctors;
+      }
+    }
+    public Dafny.ISequence<DAST._IMethod> dtor_body {
+      get {
+        return this._body;
+      }
+    }
+    public bool dtor_isCo {
+      get {
+        return this._isCo;
+      }
+    }
+  }
+
+  public interface _IDatatypeCtor {
+    bool is_DatatypeCtor { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
+    Dafny.ISequence<DAST._IFormal> dtor_args { get; }
+    bool dtor_hasAnyArgs { get; }
+    _IDatatypeCtor DowncastClone();
+  }
+  public class DatatypeCtor : _IDatatypeCtor {
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public readonly Dafny.ISequence<DAST._IFormal> _args;
+    public readonly bool _hasAnyArgs;
+    public DatatypeCtor(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IFormal> args, bool hasAnyArgs) {
+      this._name = name;
+      this._args = args;
+      this._hasAnyArgs = hasAnyArgs;
+    }
+    public _IDatatypeCtor DowncastClone() {
+      if (this is _IDatatypeCtor dt) { return dt; }
+      return new DatatypeCtor(_name, _args, _hasAnyArgs);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.DatatypeCtor;
+      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._args, oth._args) && this._hasAnyArgs == oth._hasAnyArgs;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._args));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._hasAnyArgs));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.DatatypeCtor.DatatypeCtor";
+      s += "(";
+      s += this._name.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._args);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._hasAnyArgs);
+      s += ")";
+      return s;
+    }
+    private static readonly DAST._IDatatypeCtor theDefault = create(Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<DAST._IFormal>.Empty, false);
+    public static DAST._IDatatypeCtor Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DAST._IDatatypeCtor> _TYPE = new Dafny.TypeDescriptor<DAST._IDatatypeCtor>(DAST.DatatypeCtor.Default());
+    public static Dafny.TypeDescriptor<DAST._IDatatypeCtor> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IDatatypeCtor create(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IFormal> args, bool hasAnyArgs) {
+      return new DatatypeCtor(name, args, hasAnyArgs);
+    }
+    public static _IDatatypeCtor create_DatatypeCtor(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IFormal> args, bool hasAnyArgs) {
+      return create(name, args, hasAnyArgs);
+    }
+    public bool is_DatatypeCtor { get { return true; } }
+    public Dafny.ISequence<Dafny.Rune> dtor_name {
+      get {
+        return this._name;
+      }
+    }
+    public Dafny.ISequence<DAST._IFormal> dtor_args {
+      get {
+        return this._args;
+      }
+    }
+    public bool dtor_hasAnyArgs {
+      get {
+        return this._hasAnyArgs;
+      }
+    }
+  }
+
+  public interface _INewtype {
+    bool is_Newtype { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
+    Dafny.ISequence<DAST._IType> dtor_typeParams { get; }
+    DAST._IType dtor_base { get; }
+    DAST._INewtypeRange dtor_range { get; }
+    Dafny.ISequence<DAST._IStatement> dtor_witnessStmts { get; }
+    Std.Wrappers._IOption<DAST._IExpression> dtor_witnessExpr { get; }
+    _INewtype DowncastClone();
+  }
+  public class Newtype : _INewtype {
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public readonly Dafny.ISequence<DAST._IType> _typeParams;
+    public readonly DAST._IType _base;
+    public readonly DAST._INewtypeRange _range;
+    public readonly Dafny.ISequence<DAST._IStatement> _witnessStmts;
+    public readonly Std.Wrappers._IOption<DAST._IExpression> _witnessExpr;
+    public Newtype(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IType> typeParams, DAST._IType @base, DAST._INewtypeRange range, Dafny.ISequence<DAST._IStatement> witnessStmts, Std.Wrappers._IOption<DAST._IExpression> witnessExpr) {
+      this._name = name;
+      this._typeParams = typeParams;
+      this._base = @base;
+      this._range = range;
+      this._witnessStmts = witnessStmts;
+      this._witnessExpr = witnessExpr;
+    }
+    public _INewtype DowncastClone() {
+      if (this is _INewtype dt) { return dt; }
+      return new Newtype(_name, _typeParams, _base, _range, _witnessStmts, _witnessExpr);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Newtype;
+      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._typeParams, oth._typeParams) && object.Equals(this._base, oth._base) && object.Equals(this._range, oth._range) && object.Equals(this._witnessStmts, oth._witnessStmts) && object.Equals(this._witnessExpr, oth._witnessExpr);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeParams));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._base));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._range));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._witnessStmts));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._witnessExpr));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Newtype.Newtype";
+      s += "(";
+      s += this._name.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._typeParams);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._base);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._range);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._witnessStmts);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._witnessExpr);
+      s += ")";
+      return s;
+    }
+    private static readonly DAST._INewtype theDefault = create(Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<DAST._IType>.Empty, DAST.Type.Default(), DAST.NewtypeRange.Default(), Dafny.Sequence<DAST._IStatement>.Empty, Std.Wrappers.Option<DAST._IExpression>.Default());
+    public static DAST._INewtype Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DAST._INewtype> _TYPE = new Dafny.TypeDescriptor<DAST._INewtype>(DAST.Newtype.Default());
+    public static Dafny.TypeDescriptor<DAST._INewtype> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _INewtype create(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IType> typeParams, DAST._IType @base, DAST._INewtypeRange range, Dafny.ISequence<DAST._IStatement> witnessStmts, Std.Wrappers._IOption<DAST._IExpression> witnessExpr) {
+      return new Newtype(name, typeParams, @base, range, witnessStmts, witnessExpr);
+    }
+    public static _INewtype create_Newtype(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IType> typeParams, DAST._IType @base, DAST._INewtypeRange range, Dafny.ISequence<DAST._IStatement> witnessStmts, Std.Wrappers._IOption<DAST._IExpression> witnessExpr) {
+      return create(name, typeParams, @base, range, witnessStmts, witnessExpr);
+    }
+    public bool is_Newtype { get { return true; } }
+    public Dafny.ISequence<Dafny.Rune> dtor_name {
+      get {
+        return this._name;
+      }
+    }
+    public Dafny.ISequence<DAST._IType> dtor_typeParams {
+      get {
+        return this._typeParams;
+      }
+    }
+    public DAST._IType dtor_base {
+      get {
+        return this._base;
+      }
+    }
+    public DAST._INewtypeRange dtor_range {
+      get {
+        return this._range;
+      }
+    }
+    public Dafny.ISequence<DAST._IStatement> dtor_witnessStmts {
+      get {
+        return this._witnessStmts;
+      }
+    }
+    public Std.Wrappers._IOption<DAST._IExpression> dtor_witnessExpr {
+      get {
+        return this._witnessExpr;
+      }
+    }
+  }
+
+  public interface _IClassItem {
+    bool is_Method { get; }
+    DAST._IMethod dtor_Method_a0 { get; }
+  }
+  public class ClassItem : _IClassItem {
+    public readonly DAST._IMethod _a0;
+    public ClassItem(DAST._IMethod _a0) {
+      this._a0 = _a0;
+    }
+    public static DAST._IMethod DowncastClone(DAST._IMethod _this) {
+      return _this;
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.ClassItem;
+      return oth != null && object.Equals(this._a0, oth._a0);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.ClassItem.Method";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._a0);
+      s += ")";
+      return s;
+    }
+    private static readonly DAST._IMethod theDefault = DAST.Method.Default();
+    public static DAST._IMethod Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DAST._IMethod> _TYPE = new Dafny.TypeDescriptor<DAST._IMethod>(DAST.Method.Default());
+    public static Dafny.TypeDescriptor<DAST._IMethod> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IClassItem create(DAST._IMethod _a0) {
+      return new ClassItem(_a0);
+    }
+    public static _IClassItem create_Method(DAST._IMethod _a0) {
+      return create(_a0);
+    }
+    public bool is_Method { get { return true; } }
+    public DAST._IMethod dtor_Method_a0 {
+      get {
+        return this._a0;
+      }
+    }
+  }
+
+  public interface _IField {
+    bool is_Field { get; }
+    DAST._IFormal dtor_formal { get; }
+    Std.Wrappers._IOption<DAST._IExpression> dtor_defaultValue { get; }
+    _IField DowncastClone();
+  }
+  public class Field : _IField {
+    public readonly DAST._IFormal _formal;
+    public readonly Std.Wrappers._IOption<DAST._IExpression> _defaultValue;
+    public Field(DAST._IFormal formal, Std.Wrappers._IOption<DAST._IExpression> defaultValue) {
+      this._formal = formal;
+      this._defaultValue = defaultValue;
+    }
+    public _IField DowncastClone() {
+      if (this is _IField dt) { return dt; }
+      return new Field(_formal, _defaultValue);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Field;
+      return oth != null && object.Equals(this._formal, oth._formal) && object.Equals(this._defaultValue, oth._defaultValue);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._formal));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._defaultValue));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Field.Field";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._formal);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._defaultValue);
+      s += ")";
+      return s;
+    }
+    private static readonly DAST._IField theDefault = create(DAST.Formal.Default(), Std.Wrappers.Option<DAST._IExpression>.Default());
+    public static DAST._IField Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DAST._IField> _TYPE = new Dafny.TypeDescriptor<DAST._IField>(DAST.Field.Default());
+    public static Dafny.TypeDescriptor<DAST._IField> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IField create(DAST._IFormal formal, Std.Wrappers._IOption<DAST._IExpression> defaultValue) {
+      return new Field(formal, defaultValue);
+    }
+    public static _IField create_Field(DAST._IFormal formal, Std.Wrappers._IOption<DAST._IExpression> defaultValue) {
+      return create(formal, defaultValue);
+    }
+    public bool is_Field { get { return true; } }
+    public DAST._IFormal dtor_formal {
+      get {
+        return this._formal;
+      }
+    }
+    public Std.Wrappers._IOption<DAST._IExpression> dtor_defaultValue {
+      get {
+        return this._defaultValue;
+      }
+    }
+  }
+
+  public interface _IFormal {
+    bool is_Formal { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
+    DAST._IType dtor_typ { get; }
+    _IFormal DowncastClone();
+  }
+  public class Formal : _IFormal {
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public readonly DAST._IType _typ;
+    public Formal(Dafny.ISequence<Dafny.Rune> name, DAST._IType typ) {
+      this._name = name;
+      this._typ = typ;
+    }
+    public _IFormal DowncastClone() {
+      if (this is _IFormal dt) { return dt; }
+      return new Formal(_name, _typ);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Formal;
+      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._typ, oth._typ);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typ));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Formal.Formal";
+      s += "(";
+      s += this._name.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._typ);
+      s += ")";
+      return s;
+    }
+    private static readonly DAST._IFormal theDefault = create(Dafny.Sequence<Dafny.Rune>.Empty, DAST.Type.Default());
+    public static DAST._IFormal Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DAST._IFormal> _TYPE = new Dafny.TypeDescriptor<DAST._IFormal>(DAST.Formal.Default());
+    public static Dafny.TypeDescriptor<DAST._IFormal> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IFormal create(Dafny.ISequence<Dafny.Rune> name, DAST._IType typ) {
+      return new Formal(name, typ);
+    }
+    public static _IFormal create_Formal(Dafny.ISequence<Dafny.Rune> name, DAST._IType typ) {
+      return create(name, typ);
+    }
+    public bool is_Formal { get { return true; } }
+    public Dafny.ISequence<Dafny.Rune> dtor_name {
+      get {
+        return this._name;
+      }
+    }
+    public DAST._IType dtor_typ {
+      get {
+        return this._typ;
+      }
+    }
+  }
+
+  public interface _IMethod {
+    bool is_Method { get; }
+    bool dtor_isStatic { get; }
+    bool dtor_hasBody { get; }
+    Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> dtor_overridingPath { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
+    Dafny.ISequence<DAST._IType> dtor_typeParams { get; }
+    Dafny.ISequence<DAST._IFormal> dtor_params { get; }
+    Dafny.ISequence<DAST._IStatement> dtor_body { get; }
+    Dafny.ISequence<DAST._IType> dtor_outTypes { get; }
+    Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> dtor_outVars { get; }
+    _IMethod DowncastClone();
+  }
+  public class Method : _IMethod {
+    public readonly bool _isStatic;
+    public readonly bool _hasBody;
+    public readonly Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> _overridingPath;
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public readonly Dafny.ISequence<DAST._IType> _typeParams;
+    public readonly Dafny.ISequence<DAST._IFormal> _params;
+    public readonly Dafny.ISequence<DAST._IStatement> _body;
+    public readonly Dafny.ISequence<DAST._IType> _outTypes;
+    public readonly Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> _outVars;
+    public Method(bool isStatic, bool hasBody, Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> overridingPath, Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IType> typeParams, Dafny.ISequence<DAST._IFormal> @params, Dafny.ISequence<DAST._IStatement> body, Dafny.ISequence<DAST._IType> outTypes, Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> outVars) {
+      this._isStatic = isStatic;
+      this._hasBody = hasBody;
+      this._overridingPath = overridingPath;
+      this._name = name;
+      this._typeParams = typeParams;
+      this._params = @params;
+      this._body = body;
+      this._outTypes = outTypes;
+      this._outVars = outVars;
+    }
+    public _IMethod DowncastClone() {
+      if (this is _IMethod dt) { return dt; }
+      return new Method(_isStatic, _hasBody, _overridingPath, _name, _typeParams, _params, _body, _outTypes, _outVars);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Method;
+      return oth != null && this._isStatic == oth._isStatic && this._hasBody == oth._hasBody && object.Equals(this._overridingPath, oth._overridingPath) && object.Equals(this._name, oth._name) && object.Equals(this._typeParams, oth._typeParams) && object.Equals(this._params, oth._params) && object.Equals(this._body, oth._body) && object.Equals(this._outTypes, oth._outTypes) && object.Equals(this._outVars, oth._outVars);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._isStatic));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._hasBody));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._overridingPath));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeParams));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._params));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._outTypes));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._outVars));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Method.Method";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._isStatic);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._hasBody);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._overridingPath);
+      s += ", ";
+      s += this._name.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._typeParams);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._params);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._body);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._outTypes);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._outVars);
+      s += ")";
+      return s;
+    }
+    private static readonly DAST._IMethod theDefault = create(false, false, Std.Wrappers.Option<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>>.Default(), Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<DAST._IType>.Empty, Dafny.Sequence<DAST._IFormal>.Empty, Dafny.Sequence<DAST._IStatement>.Empty, Dafny.Sequence<DAST._IType>.Empty, Std.Wrappers.Option<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>>.Default());
+    public static DAST._IMethod Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DAST._IMethod> _TYPE = new Dafny.TypeDescriptor<DAST._IMethod>(DAST.Method.Default());
+    public static Dafny.TypeDescriptor<DAST._IMethod> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IMethod create(bool isStatic, bool hasBody, Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> overridingPath, Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IType> typeParams, Dafny.ISequence<DAST._IFormal> @params, Dafny.ISequence<DAST._IStatement> body, Dafny.ISequence<DAST._IType> outTypes, Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> outVars) {
+      return new Method(isStatic, hasBody, overridingPath, name, typeParams, @params, body, outTypes, outVars);
+    }
+    public static _IMethod create_Method(bool isStatic, bool hasBody, Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> overridingPath, Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<DAST._IType> typeParams, Dafny.ISequence<DAST._IFormal> @params, Dafny.ISequence<DAST._IStatement> body, Dafny.ISequence<DAST._IType> outTypes, Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> outVars) {
+      return create(isStatic, hasBody, overridingPath, name, typeParams, @params, body, outTypes, outVars);
+    }
+    public bool is_Method { get { return true; } }
+    public bool dtor_isStatic {
+      get {
+        return this._isStatic;
+      }
+    }
+    public bool dtor_hasBody {
+      get {
+        return this._hasBody;
+      }
+    }
+    public Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> dtor_overridingPath {
+      get {
+        return this._overridingPath;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_name {
+      get {
+        return this._name;
+      }
+    }
+    public Dafny.ISequence<DAST._IType> dtor_typeParams {
+      get {
+        return this._typeParams;
+      }
+    }
+    public Dafny.ISequence<DAST._IFormal> dtor_params {
+      get {
+        return this._params;
+      }
+    }
+    public Dafny.ISequence<DAST._IStatement> dtor_body {
+      get {
+        return this._body;
+      }
+    }
+    public Dafny.ISequence<DAST._IType> dtor_outTypes {
+      get {
+        return this._outTypes;
+      }
+    }
+    public Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> dtor_outVars {
+      get {
+        return this._outVars;
+      }
+    }
+  }
+
+  public interface _ICallName {
+    bool is_Name { get; }
+    bool is_MapBuilderAdd { get; }
+    bool is_MapBuilderBuild { get; }
+    bool is_SetBuilderAdd { get; }
+    bool is_SetBuilderBuild { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
+    _ICallName DowncastClone();
+  }
+  public abstract class CallName : _ICallName {
+    public CallName() {
+    }
+    private static readonly DAST._ICallName theDefault = create_Name(Dafny.Sequence<Dafny.Rune>.Empty);
+    public static DAST._ICallName Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DAST._ICallName> _TYPE = new Dafny.TypeDescriptor<DAST._ICallName>(DAST.CallName.Default());
+    public static Dafny.TypeDescriptor<DAST._ICallName> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _ICallName create_Name(Dafny.ISequence<Dafny.Rune> name) {
+      return new CallName_Name(name);
+    }
+    public static _ICallName create_MapBuilderAdd() {
+      return new CallName_MapBuilderAdd();
+    }
+    public static _ICallName create_MapBuilderBuild() {
+      return new CallName_MapBuilderBuild();
+    }
+    public static _ICallName create_SetBuilderAdd() {
+      return new CallName_SetBuilderAdd();
+    }
+    public static _ICallName create_SetBuilderBuild() {
+      return new CallName_SetBuilderBuild();
+    }
+    public bool is_Name { get { return this is CallName_Name; } }
+    public bool is_MapBuilderAdd { get { return this is CallName_MapBuilderAdd; } }
+    public bool is_MapBuilderBuild { get { return this is CallName_MapBuilderBuild; } }
+    public bool is_SetBuilderAdd { get { return this is CallName_SetBuilderAdd; } }
+    public bool is_SetBuilderBuild { get { return this is CallName_SetBuilderBuild; } }
+    public Dafny.ISequence<Dafny.Rune> dtor_name {
+      get {
+        var d = this;
+        return ((CallName_Name)d)._name;
+      }
+    }
+    public abstract _ICallName DowncastClone();
+  }
+  public class CallName_Name : CallName {
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public CallName_Name(Dafny.ISequence<Dafny.Rune> name) : base() {
+      this._name = name;
+    }
+    public override _ICallName DowncastClone() {
+      if (this is _ICallName dt) { return dt; }
+      return new CallName_Name(_name);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.CallName_Name;
+      return oth != null && object.Equals(this._name, oth._name);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.CallName.Name";
+      s += "(";
+      s += this._name.ToVerbatimString(true);
+      s += ")";
+      return s;
+    }
+  }
+  public class CallName_MapBuilderAdd : CallName {
+    public CallName_MapBuilderAdd() : base() {
+    }
+    public override _ICallName DowncastClone() {
+      if (this is _ICallName dt) { return dt; }
+      return new CallName_MapBuilderAdd();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.CallName_MapBuilderAdd;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.CallName.MapBuilderAdd";
+      return s;
+    }
+  }
+  public class CallName_MapBuilderBuild : CallName {
+    public CallName_MapBuilderBuild() : base() {
+    }
+    public override _ICallName DowncastClone() {
+      if (this is _ICallName dt) { return dt; }
+      return new CallName_MapBuilderBuild();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.CallName_MapBuilderBuild;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 2;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.CallName.MapBuilderBuild";
+      return s;
+    }
+  }
+  public class CallName_SetBuilderAdd : CallName {
+    public CallName_SetBuilderAdd() : base() {
+    }
+    public override _ICallName DowncastClone() {
+      if (this is _ICallName dt) { return dt; }
+      return new CallName_SetBuilderAdd();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.CallName_SetBuilderAdd;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 3;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.CallName.SetBuilderAdd";
+      return s;
+    }
+  }
+  public class CallName_SetBuilderBuild : CallName {
+    public CallName_SetBuilderBuild() : base() {
+    }
+    public override _ICallName DowncastClone() {
+      if (this is _ICallName dt) { return dt; }
+      return new CallName_SetBuilderBuild();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.CallName_SetBuilderBuild;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 4;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.CallName.SetBuilderBuild";
+      return s;
+    }
+  }
+
+  public interface _IStatement {
+    bool is_DeclareVar { get; }
+    bool is_Assign { get; }
+    bool is_If { get; }
+    bool is_Labeled { get; }
+    bool is_While { get; }
+    bool is_Foreach { get; }
+    bool is_Call { get; }
+    bool is_Return { get; }
+    bool is_EarlyReturn { get; }
+    bool is_Break { get; }
+    bool is_TailRecursive { get; }
+    bool is_JumpTailCallStart { get; }
+    bool is_Halt { get; }
+    bool is_Print { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
+    DAST._IType dtor_typ { get; }
+    Std.Wrappers._IOption<DAST._IExpression> dtor_maybeValue { get; }
+    DAST._IAssignLhs dtor_lhs { get; }
+    DAST._IExpression dtor_value { get; }
+    DAST._IExpression dtor_cond { get; }
+    Dafny.ISequence<DAST._IStatement> dtor_thn { get; }
+    Dafny.ISequence<DAST._IStatement> dtor_els { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_lbl { get; }
+    Dafny.ISequence<DAST._IStatement> dtor_body { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_boundName { get; }
+    DAST._IType dtor_boundType { get; }
+    DAST._IExpression dtor_over { get; }
+    DAST._IExpression dtor_on { get; }
+    DAST._ICallName dtor_callName { get; }
+    Dafny.ISequence<DAST._IType> dtor_typeArgs { get; }
+    Dafny.ISequence<DAST._IExpression> dtor_args { get; }
+    Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> dtor_outs { get; }
+    DAST._IExpression dtor_expr { get; }
+    Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> dtor_toLabel { get; }
+    DAST._IExpression dtor_Print_a0 { get; }
+    _IStatement DowncastClone();
+  }
+  public abstract class Statement : _IStatement {
+    public Statement() {
+    }
+    private static readonly DAST._IStatement theDefault = create_DeclareVar(Dafny.Sequence<Dafny.Rune>.Empty, DAST.Type.Default(), Std.Wrappers.Option<DAST._IExpression>.Default());
+    public static DAST._IStatement Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DAST._IStatement> _TYPE = new Dafny.TypeDescriptor<DAST._IStatement>(DAST.Statement.Default());
+    public static Dafny.TypeDescriptor<DAST._IStatement> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IStatement create_DeclareVar(Dafny.ISequence<Dafny.Rune> name, DAST._IType typ, Std.Wrappers._IOption<DAST._IExpression> maybeValue) {
+      return new Statement_DeclareVar(name, typ, maybeValue);
+    }
+    public static _IStatement create_Assign(DAST._IAssignLhs lhs, DAST._IExpression @value) {
+      return new Statement_Assign(lhs, @value);
+    }
+    public static _IStatement create_If(DAST._IExpression cond, Dafny.ISequence<DAST._IStatement> thn, Dafny.ISequence<DAST._IStatement> els) {
+      return new Statement_If(cond, thn, els);
+    }
+    public static _IStatement create_Labeled(Dafny.ISequence<Dafny.Rune> lbl, Dafny.ISequence<DAST._IStatement> body) {
+      return new Statement_Labeled(lbl, body);
+    }
+    public static _IStatement create_While(DAST._IExpression cond, Dafny.ISequence<DAST._IStatement> body) {
+      return new Statement_While(cond, body);
+    }
+    public static _IStatement create_Foreach(Dafny.ISequence<Dafny.Rune> boundName, DAST._IType boundType, DAST._IExpression over, Dafny.ISequence<DAST._IStatement> body) {
+      return new Statement_Foreach(boundName, boundType, over, body);
+    }
+    public static _IStatement create_Call(DAST._IExpression @on, DAST._ICallName callName, Dafny.ISequence<DAST._IType> typeArgs, Dafny.ISequence<DAST._IExpression> args, Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> outs) {
+      return new Statement_Call(@on, callName, typeArgs, args, outs);
+    }
+    public static _IStatement create_Return(DAST._IExpression expr) {
+      return new Statement_Return(expr);
+    }
+    public static _IStatement create_EarlyReturn() {
+      return new Statement_EarlyReturn();
+    }
+    public static _IStatement create_Break(Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> toLabel) {
+      return new Statement_Break(toLabel);
+    }
+    public static _IStatement create_TailRecursive(Dafny.ISequence<DAST._IStatement> body) {
+      return new Statement_TailRecursive(body);
+    }
+    public static _IStatement create_JumpTailCallStart() {
+      return new Statement_JumpTailCallStart();
+    }
+    public static _IStatement create_Halt() {
+      return new Statement_Halt();
+    }
+    public static _IStatement create_Print(DAST._IExpression _a0) {
+      return new Statement_Print(_a0);
+    }
+    public bool is_DeclareVar { get { return this is Statement_DeclareVar; } }
+    public bool is_Assign { get { return this is Statement_Assign; } }
+    public bool is_If { get { return this is Statement_If; } }
+    public bool is_Labeled { get { return this is Statement_Labeled; } }
+    public bool is_While { get { return this is Statement_While; } }
+    public bool is_Foreach { get { return this is Statement_Foreach; } }
+    public bool is_Call { get { return this is Statement_Call; } }
+    public bool is_Return { get { return this is Statement_Return; } }
+    public bool is_EarlyReturn { get { return this is Statement_EarlyReturn; } }
+    public bool is_Break { get { return this is Statement_Break; } }
+    public bool is_TailRecursive { get { return this is Statement_TailRecursive; } }
+    public bool is_JumpTailCallStart { get { return this is Statement_JumpTailCallStart; } }
+    public bool is_Halt { get { return this is Statement_Halt; } }
+    public bool is_Print { get { return this is Statement_Print; } }
+    public Dafny.ISequence<Dafny.Rune> dtor_name {
+      get {
+        var d = this;
+        return ((Statement_DeclareVar)d)._name;
+      }
+    }
+    public DAST._IType dtor_typ {
+      get {
+        var d = this;
+        return ((Statement_DeclareVar)d)._typ;
+      }
+    }
+    public Std.Wrappers._IOption<DAST._IExpression> dtor_maybeValue {
+      get {
+        var d = this;
+        return ((Statement_DeclareVar)d)._maybeValue;
+      }
+    }
+    public DAST._IAssignLhs dtor_lhs {
+      get {
+        var d = this;
+        return ((Statement_Assign)d)._lhs;
+      }
+    }
+    public DAST._IExpression dtor_value {
+      get {
+        var d = this;
+        return ((Statement_Assign)d)._value;
+      }
+    }
+    public DAST._IExpression dtor_cond {
+      get {
+        var d = this;
+        if (d is Statement_If) { return ((Statement_If)d)._cond; }
+        return ((Statement_While)d)._cond;
+      }
+    }
+    public Dafny.ISequence<DAST._IStatement> dtor_thn {
+      get {
+        var d = this;
+        return ((Statement_If)d)._thn;
+      }
+    }
+    public Dafny.ISequence<DAST._IStatement> dtor_els {
+      get {
+        var d = this;
+        return ((Statement_If)d)._els;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_lbl {
+      get {
+        var d = this;
+        return ((Statement_Labeled)d)._lbl;
+      }
+    }
+    public Dafny.ISequence<DAST._IStatement> dtor_body {
+      get {
+        var d = this;
+        if (d is Statement_Labeled) { return ((Statement_Labeled)d)._body; }
+        if (d is Statement_While) { return ((Statement_While)d)._body; }
+        if (d is Statement_Foreach) { return ((Statement_Foreach)d)._body; }
+        return ((Statement_TailRecursive)d)._body;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_boundName {
+      get {
+        var d = this;
+        return ((Statement_Foreach)d)._boundName;
+      }
+    }
+    public DAST._IType dtor_boundType {
+      get {
+        var d = this;
+        return ((Statement_Foreach)d)._boundType;
+      }
+    }
+    public DAST._IExpression dtor_over {
+      get {
+        var d = this;
+        return ((Statement_Foreach)d)._over;
+      }
+    }
+    public DAST._IExpression dtor_on {
+      get {
+        var d = this;
+        return ((Statement_Call)d)._on;
+      }
+    }
+    public DAST._ICallName dtor_callName {
+      get {
+        var d = this;
+        return ((Statement_Call)d)._callName;
+      }
+    }
+    public Dafny.ISequence<DAST._IType> dtor_typeArgs {
+      get {
+        var d = this;
+        return ((Statement_Call)d)._typeArgs;
+      }
+    }
+    public Dafny.ISequence<DAST._IExpression> dtor_args {
+      get {
+        var d = this;
+        return ((Statement_Call)d)._args;
+      }
+    }
+    public Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> dtor_outs {
+      get {
+        var d = this;
+        return ((Statement_Call)d)._outs;
+      }
+    }
+    public DAST._IExpression dtor_expr {
+      get {
+        var d = this;
+        return ((Statement_Return)d)._expr;
+      }
+    }
+    public Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> dtor_toLabel {
+      get {
+        var d = this;
+        return ((Statement_Break)d)._toLabel;
+      }
+    }
+    public DAST._IExpression dtor_Print_a0 {
+      get {
+        var d = this;
+        return ((Statement_Print)d)._a0;
+      }
+    }
+    public abstract _IStatement DowncastClone();
+  }
+  public class Statement_DeclareVar : Statement {
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public readonly DAST._IType _typ;
+    public readonly Std.Wrappers._IOption<DAST._IExpression> _maybeValue;
+    public Statement_DeclareVar(Dafny.ISequence<Dafny.Rune> name, DAST._IType typ, Std.Wrappers._IOption<DAST._IExpression> maybeValue) : base() {
+      this._name = name;
+      this._typ = typ;
+      this._maybeValue = maybeValue;
+    }
+    public override _IStatement DowncastClone() {
+      if (this is _IStatement dt) { return dt; }
+      return new Statement_DeclareVar(_name, _typ, _maybeValue);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Statement_DeclareVar;
+      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._typ, oth._typ) && object.Equals(this._maybeValue, oth._maybeValue);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typ));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._maybeValue));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Statement.DeclareVar";
+      s += "(";
+      s += this._name.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._typ);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._maybeValue);
+      s += ")";
+      return s;
+    }
+  }
+  public class Statement_Assign : Statement {
+    public readonly DAST._IAssignLhs _lhs;
+    public readonly DAST._IExpression _value;
+    public Statement_Assign(DAST._IAssignLhs lhs, DAST._IExpression @value) : base() {
+      this._lhs = lhs;
+      this._value = @value;
+    }
+    public override _IStatement DowncastClone() {
+      if (this is _IStatement dt) { return dt; }
+      return new Statement_Assign(_lhs, _value);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Statement_Assign;
+      return oth != null && object.Equals(this._lhs, oth._lhs) && object.Equals(this._value, oth._value);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._lhs));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._value));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Statement.Assign";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._lhs);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._value);
+      s += ")";
+      return s;
+    }
+  }
+  public class Statement_If : Statement {
+    public readonly DAST._IExpression _cond;
+    public readonly Dafny.ISequence<DAST._IStatement> _thn;
+    public readonly Dafny.ISequence<DAST._IStatement> _els;
+    public Statement_If(DAST._IExpression cond, Dafny.ISequence<DAST._IStatement> thn, Dafny.ISequence<DAST._IStatement> els) : base() {
+      this._cond = cond;
+      this._thn = thn;
+      this._els = els;
+    }
+    public override _IStatement DowncastClone() {
+      if (this is _IStatement dt) { return dt; }
+      return new Statement_If(_cond, _thn, _els);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Statement_If;
+      return oth != null && object.Equals(this._cond, oth._cond) && object.Equals(this._thn, oth._thn) && object.Equals(this._els, oth._els);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 2;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._cond));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._thn));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._els));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Statement.If";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._cond);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._thn);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._els);
+      s += ")";
+      return s;
+    }
+  }
+  public class Statement_Labeled : Statement {
+    public readonly Dafny.ISequence<Dafny.Rune> _lbl;
+    public readonly Dafny.ISequence<DAST._IStatement> _body;
+    public Statement_Labeled(Dafny.ISequence<Dafny.Rune> lbl, Dafny.ISequence<DAST._IStatement> body) : base() {
+      this._lbl = lbl;
+      this._body = body;
+    }
+    public override _IStatement DowncastClone() {
+      if (this is _IStatement dt) { return dt; }
+      return new Statement_Labeled(_lbl, _body);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Statement_Labeled;
+      return oth != null && object.Equals(this._lbl, oth._lbl) && object.Equals(this._body, oth._body);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 3;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._lbl));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Statement.Labeled";
+      s += "(";
+      s += this._lbl.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._body);
+      s += ")";
+      return s;
+    }
+  }
+  public class Statement_While : Statement {
+    public readonly DAST._IExpression _cond;
+    public readonly Dafny.ISequence<DAST._IStatement> _body;
+    public Statement_While(DAST._IExpression cond, Dafny.ISequence<DAST._IStatement> body) : base() {
+      this._cond = cond;
+      this._body = body;
+    }
+    public override _IStatement DowncastClone() {
+      if (this is _IStatement dt) { return dt; }
+      return new Statement_While(_cond, _body);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Statement_While;
+      return oth != null && object.Equals(this._cond, oth._cond) && object.Equals(this._body, oth._body);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 4;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._cond));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Statement.While";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._cond);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._body);
+      s += ")";
+      return s;
+    }
+  }
+  public class Statement_Foreach : Statement {
+    public readonly Dafny.ISequence<Dafny.Rune> _boundName;
+    public readonly DAST._IType _boundType;
+    public readonly DAST._IExpression _over;
+    public readonly Dafny.ISequence<DAST._IStatement> _body;
+    public Statement_Foreach(Dafny.ISequence<Dafny.Rune> boundName, DAST._IType boundType, DAST._IExpression over, Dafny.ISequence<DAST._IStatement> body) : base() {
+      this._boundName = boundName;
+      this._boundType = boundType;
+      this._over = over;
+      this._body = body;
+    }
+    public override _IStatement DowncastClone() {
+      if (this is _IStatement dt) { return dt; }
+      return new Statement_Foreach(_boundName, _boundType, _over, _body);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Statement_Foreach;
+      return oth != null && object.Equals(this._boundName, oth._boundName) && object.Equals(this._boundType, oth._boundType) && object.Equals(this._over, oth._over) && object.Equals(this._body, oth._body);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 5;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._boundName));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._boundType));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._over));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Statement.Foreach";
+      s += "(";
+      s += this._boundName.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._boundType);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._over);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._body);
+      s += ")";
+      return s;
+    }
+  }
+  public class Statement_Call : Statement {
+    public readonly DAST._IExpression _on;
+    public readonly DAST._ICallName _callName;
+    public readonly Dafny.ISequence<DAST._IType> _typeArgs;
+    public readonly Dafny.ISequence<DAST._IExpression> _args;
+    public readonly Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> _outs;
+    public Statement_Call(DAST._IExpression @on, DAST._ICallName callName, Dafny.ISequence<DAST._IType> typeArgs, Dafny.ISequence<DAST._IExpression> args, Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> outs) : base() {
+      this._on = @on;
+      this._callName = callName;
+      this._typeArgs = typeArgs;
+      this._args = args;
+      this._outs = outs;
+    }
+    public override _IStatement DowncastClone() {
+      if (this is _IStatement dt) { return dt; }
+      return new Statement_Call(_on, _callName, _typeArgs, _args, _outs);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Statement_Call;
+      return oth != null && object.Equals(this._on, oth._on) && object.Equals(this._callName, oth._callName) && object.Equals(this._typeArgs, oth._typeArgs) && object.Equals(this._args, oth._args) && object.Equals(this._outs, oth._outs);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 6;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._on));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._callName));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeArgs));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._args));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._outs));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Statement.Call";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._on);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._callName);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._typeArgs);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._args);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._outs);
+      s += ")";
+      return s;
+    }
+  }
+  public class Statement_Return : Statement {
+    public readonly DAST._IExpression _expr;
+    public Statement_Return(DAST._IExpression expr) : base() {
+      this._expr = expr;
+    }
+    public override _IStatement DowncastClone() {
+      if (this is _IStatement dt) { return dt; }
+      return new Statement_Return(_expr);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Statement_Return;
+      return oth != null && object.Equals(this._expr, oth._expr);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 7;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Statement.Return";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._expr);
+      s += ")";
+      return s;
+    }
+  }
+  public class Statement_EarlyReturn : Statement {
+    public Statement_EarlyReturn() : base() {
+    }
+    public override _IStatement DowncastClone() {
+      if (this is _IStatement dt) { return dt; }
+      return new Statement_EarlyReturn();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Statement_EarlyReturn;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 8;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Statement.EarlyReturn";
+      return s;
+    }
+  }
+  public class Statement_Break : Statement {
+    public readonly Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _toLabel;
+    public Statement_Break(Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> toLabel) : base() {
+      this._toLabel = toLabel;
+    }
+    public override _IStatement DowncastClone() {
+      if (this is _IStatement dt) { return dt; }
+      return new Statement_Break(_toLabel);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Statement_Break;
+      return oth != null && object.Equals(this._toLabel, oth._toLabel);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 9;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._toLabel));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Statement.Break";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._toLabel);
+      s += ")";
+      return s;
+    }
+  }
+  public class Statement_TailRecursive : Statement {
+    public readonly Dafny.ISequence<DAST._IStatement> _body;
+    public Statement_TailRecursive(Dafny.ISequence<DAST._IStatement> body) : base() {
+      this._body = body;
+    }
+    public override _IStatement DowncastClone() {
+      if (this is _IStatement dt) { return dt; }
+      return new Statement_TailRecursive(_body);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Statement_TailRecursive;
+      return oth != null && object.Equals(this._body, oth._body);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 10;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Statement.TailRecursive";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._body);
+      s += ")";
+      return s;
+    }
+  }
+  public class Statement_JumpTailCallStart : Statement {
+    public Statement_JumpTailCallStart() : base() {
+    }
+    public override _IStatement DowncastClone() {
+      if (this is _IStatement dt) { return dt; }
+      return new Statement_JumpTailCallStart();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Statement_JumpTailCallStart;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 11;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Statement.JumpTailCallStart";
+      return s;
+    }
+  }
+  public class Statement_Halt : Statement {
+    public Statement_Halt() : base() {
+    }
+    public override _IStatement DowncastClone() {
+      if (this is _IStatement dt) { return dt; }
+      return new Statement_Halt();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Statement_Halt;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 12;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Statement.Halt";
+      return s;
+    }
+  }
+  public class Statement_Print : Statement {
+    public readonly DAST._IExpression _a0;
+    public Statement_Print(DAST._IExpression _a0) : base() {
+      this._a0 = _a0;
+    }
+    public override _IStatement DowncastClone() {
+      if (this is _IStatement dt) { return dt; }
+      return new Statement_Print(_a0);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Statement_Print;
+      return oth != null && object.Equals(this._a0, oth._a0);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 13;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Statement.Print";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._a0);
+      s += ")";
+      return s;
+    }
+  }
+
+  public interface _IAssignLhs {
+    bool is_Ident { get; }
+    bool is_Select { get; }
+    bool is_Index { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_Ident_a0 { get; }
+    DAST._IExpression dtor_expr { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_field { get; }
+    Dafny.ISequence<DAST._IExpression> dtor_indices { get; }
+    _IAssignLhs DowncastClone();
+  }
+  public abstract class AssignLhs : _IAssignLhs {
+    public AssignLhs() {
+    }
+    private static readonly DAST._IAssignLhs theDefault = create_Ident(Dafny.Sequence<Dafny.Rune>.Empty);
+    public static DAST._IAssignLhs Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DAST._IAssignLhs> _TYPE = new Dafny.TypeDescriptor<DAST._IAssignLhs>(DAST.AssignLhs.Default());
+    public static Dafny.TypeDescriptor<DAST._IAssignLhs> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IAssignLhs create_Ident(Dafny.ISequence<Dafny.Rune> _a0) {
+      return new AssignLhs_Ident(_a0);
+    }
+    public static _IAssignLhs create_Select(DAST._IExpression expr, Dafny.ISequence<Dafny.Rune> field) {
+      return new AssignLhs_Select(expr, field);
+    }
+    public static _IAssignLhs create_Index(DAST._IExpression expr, Dafny.ISequence<DAST._IExpression> indices) {
+      return new AssignLhs_Index(expr, indices);
+    }
+    public bool is_Ident { get { return this is AssignLhs_Ident; } }
+    public bool is_Select { get { return this is AssignLhs_Select; } }
+    public bool is_Index { get { return this is AssignLhs_Index; } }
+    public Dafny.ISequence<Dafny.Rune> dtor_Ident_a0 {
+      get {
+        var d = this;
+        return ((AssignLhs_Ident)d)._a0;
+      }
+    }
+    public DAST._IExpression dtor_expr {
+      get {
+        var d = this;
+        if (d is AssignLhs_Select) { return ((AssignLhs_Select)d)._expr; }
+        return ((AssignLhs_Index)d)._expr;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_field {
+      get {
+        var d = this;
+        return ((AssignLhs_Select)d)._field;
+      }
+    }
+    public Dafny.ISequence<DAST._IExpression> dtor_indices {
+      get {
+        var d = this;
+        return ((AssignLhs_Index)d)._indices;
+      }
+    }
+    public abstract _IAssignLhs DowncastClone();
+  }
+  public class AssignLhs_Ident : AssignLhs {
+    public readonly Dafny.ISequence<Dafny.Rune> _a0;
+    public AssignLhs_Ident(Dafny.ISequence<Dafny.Rune> _a0) : base() {
+      this._a0 = _a0;
+    }
+    public override _IAssignLhs DowncastClone() {
+      if (this is _IAssignLhs dt) { return dt; }
+      return new AssignLhs_Ident(_a0);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.AssignLhs_Ident;
+      return oth != null && object.Equals(this._a0, oth._a0);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.AssignLhs.Ident";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._a0);
+      s += ")";
+      return s;
+    }
+  }
+  public class AssignLhs_Select : AssignLhs {
+    public readonly DAST._IExpression _expr;
+    public readonly Dafny.ISequence<Dafny.Rune> _field;
+    public AssignLhs_Select(DAST._IExpression expr, Dafny.ISequence<Dafny.Rune> field) : base() {
+      this._expr = expr;
+      this._field = field;
+    }
+    public override _IAssignLhs DowncastClone() {
+      if (this is _IAssignLhs dt) { return dt; }
+      return new AssignLhs_Select(_expr, _field);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.AssignLhs_Select;
+      return oth != null && object.Equals(this._expr, oth._expr) && object.Equals(this._field, oth._field);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._field));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.AssignLhs.Select";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._expr);
+      s += ", ";
+      s += this._field.ToVerbatimString(true);
+      s += ")";
+      return s;
+    }
+  }
+  public class AssignLhs_Index : AssignLhs {
+    public readonly DAST._IExpression _expr;
+    public readonly Dafny.ISequence<DAST._IExpression> _indices;
+    public AssignLhs_Index(DAST._IExpression expr, Dafny.ISequence<DAST._IExpression> indices) : base() {
+      this._expr = expr;
+      this._indices = indices;
+    }
+    public override _IAssignLhs DowncastClone() {
+      if (this is _IAssignLhs dt) { return dt; }
+      return new AssignLhs_Index(_expr, _indices);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.AssignLhs_Index;
+      return oth != null && object.Equals(this._expr, oth._expr) && object.Equals(this._indices, oth._indices);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 2;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._indices));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.AssignLhs.Index";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._expr);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._indices);
+      s += ")";
+      return s;
+    }
+  }
+
+  public interface _ICollKind {
+    bool is_Seq { get; }
+    bool is_Array { get; }
+    bool is_Map { get; }
+    _ICollKind DowncastClone();
+  }
+  public abstract class CollKind : _ICollKind {
+    public CollKind() {
+    }
+    private static readonly DAST._ICollKind theDefault = create_Seq();
+    public static DAST._ICollKind Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DAST._ICollKind> _TYPE = new Dafny.TypeDescriptor<DAST._ICollKind>(DAST.CollKind.Default());
+    public static Dafny.TypeDescriptor<DAST._ICollKind> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _ICollKind create_Seq() {
+      return new CollKind_Seq();
+    }
+    public static _ICollKind create_Array() {
+      return new CollKind_Array();
+    }
+    public static _ICollKind create_Map() {
+      return new CollKind_Map();
+    }
+    public bool is_Seq { get { return this is CollKind_Seq; } }
+    public bool is_Array { get { return this is CollKind_Array; } }
+    public bool is_Map { get { return this is CollKind_Map; } }
+    public static System.Collections.Generic.IEnumerable<_ICollKind> AllSingletonConstructors {
+      get {
+        yield return CollKind.create_Seq();
+        yield return CollKind.create_Array();
+        yield return CollKind.create_Map();
+      }
+    }
+    public abstract _ICollKind DowncastClone();
+  }
+  public class CollKind_Seq : CollKind {
+    public CollKind_Seq() : base() {
+    }
+    public override _ICollKind DowncastClone() {
+      if (this is _ICollKind dt) { return dt; }
+      return new CollKind_Seq();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.CollKind_Seq;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.CollKind.Seq";
+      return s;
+    }
+  }
+  public class CollKind_Array : CollKind {
+    public CollKind_Array() : base() {
+    }
+    public override _ICollKind DowncastClone() {
+      if (this is _ICollKind dt) { return dt; }
+      return new CollKind_Array();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.CollKind_Array;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.CollKind.Array";
+      return s;
+    }
+  }
+  public class CollKind_Map : CollKind {
+    public CollKind_Map() : base() {
+    }
+    public override _ICollKind DowncastClone() {
+      if (this is _ICollKind dt) { return dt; }
+      return new CollKind_Map();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.CollKind_Map;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 2;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.CollKind.Map";
+      return s;
+    }
+  }
+
+  public interface _IBinOp {
+    bool is_Eq { get; }
+    bool is_Div { get; }
+    bool is_EuclidianDiv { get; }
+    bool is_Mod { get; }
+    bool is_EuclidianMod { get; }
+    bool is_Lt { get; }
+    bool is_LtChar { get; }
+    bool is_Plus { get; }
+    bool is_Minus { get; }
+    bool is_Times { get; }
+    bool is_BitwiseAnd { get; }
+    bool is_BitwiseOr { get; }
+    bool is_BitwiseXor { get; }
+    bool is_BitwiseShiftRight { get; }
+    bool is_BitwiseShiftLeft { get; }
+    bool is_And { get; }
+    bool is_Or { get; }
+    bool is_In { get; }
+    bool is_SeqProperPrefix { get; }
+    bool is_SeqPrefix { get; }
+    bool is_SetMerge { get; }
+    bool is_SetSubtraction { get; }
+    bool is_SetIntersection { get; }
+    bool is_Subset { get; }
+    bool is_ProperSubset { get; }
+    bool is_SetDisjoint { get; }
+    bool is_MapMerge { get; }
+    bool is_MapSubtraction { get; }
+    bool is_MultisetMerge { get; }
+    bool is_MultisetSubtraction { get; }
+    bool is_MultisetIntersection { get; }
+    bool is_Submultiset { get; }
+    bool is_ProperSubmultiset { get; }
+    bool is_MultisetDisjoint { get; }
+    bool is_Concat { get; }
+    bool is_Passthrough { get; }
+    bool dtor_referential { get; }
+    bool dtor_nullable { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_Passthrough_a0 { get; }
+    _IBinOp DowncastClone();
+  }
+  public abstract class BinOp : _IBinOp {
+    public BinOp() {
+    }
+    private static readonly DAST._IBinOp theDefault = create_Eq(false, false);
+    public static DAST._IBinOp Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DAST._IBinOp> _TYPE = new Dafny.TypeDescriptor<DAST._IBinOp>(DAST.BinOp.Default());
+    public static Dafny.TypeDescriptor<DAST._IBinOp> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IBinOp create_Eq(bool referential, bool nullable) {
+      return new BinOp_Eq(referential, nullable);
+    }
+    public static _IBinOp create_Div() {
+      return new BinOp_Div();
+    }
+    public static _IBinOp create_EuclidianDiv() {
+      return new BinOp_EuclidianDiv();
+    }
+    public static _IBinOp create_Mod() {
+      return new BinOp_Mod();
+    }
+    public static _IBinOp create_EuclidianMod() {
+      return new BinOp_EuclidianMod();
+    }
+    public static _IBinOp create_Lt() {
+      return new BinOp_Lt();
+    }
+    public static _IBinOp create_LtChar() {
+      return new BinOp_LtChar();
+    }
+    public static _IBinOp create_Plus() {
+      return new BinOp_Plus();
+    }
+    public static _IBinOp create_Minus() {
+      return new BinOp_Minus();
+    }
+    public static _IBinOp create_Times() {
+      return new BinOp_Times();
+    }
+    public static _IBinOp create_BitwiseAnd() {
+      return new BinOp_BitwiseAnd();
+    }
+    public static _IBinOp create_BitwiseOr() {
+      return new BinOp_BitwiseOr();
+    }
+    public static _IBinOp create_BitwiseXor() {
+      return new BinOp_BitwiseXor();
+    }
+    public static _IBinOp create_BitwiseShiftRight() {
+      return new BinOp_BitwiseShiftRight();
+    }
+    public static _IBinOp create_BitwiseShiftLeft() {
+      return new BinOp_BitwiseShiftLeft();
+    }
+    public static _IBinOp create_And() {
+      return new BinOp_And();
+    }
+    public static _IBinOp create_Or() {
+      return new BinOp_Or();
+    }
+    public static _IBinOp create_In() {
+      return new BinOp_In();
+    }
+    public static _IBinOp create_SeqProperPrefix() {
+      return new BinOp_SeqProperPrefix();
+    }
+    public static _IBinOp create_SeqPrefix() {
+      return new BinOp_SeqPrefix();
+    }
+    public static _IBinOp create_SetMerge() {
+      return new BinOp_SetMerge();
+    }
+    public static _IBinOp create_SetSubtraction() {
+      return new BinOp_SetSubtraction();
+    }
+    public static _IBinOp create_SetIntersection() {
+      return new BinOp_SetIntersection();
+    }
+    public static _IBinOp create_Subset() {
+      return new BinOp_Subset();
+    }
+    public static _IBinOp create_ProperSubset() {
+      return new BinOp_ProperSubset();
+    }
+    public static _IBinOp create_SetDisjoint() {
+      return new BinOp_SetDisjoint();
+    }
+    public static _IBinOp create_MapMerge() {
+      return new BinOp_MapMerge();
+    }
+    public static _IBinOp create_MapSubtraction() {
+      return new BinOp_MapSubtraction();
+    }
+    public static _IBinOp create_MultisetMerge() {
+      return new BinOp_MultisetMerge();
+    }
+    public static _IBinOp create_MultisetSubtraction() {
+      return new BinOp_MultisetSubtraction();
+    }
+    public static _IBinOp create_MultisetIntersection() {
+      return new BinOp_MultisetIntersection();
+    }
+    public static _IBinOp create_Submultiset() {
+      return new BinOp_Submultiset();
+    }
+    public static _IBinOp create_ProperSubmultiset() {
+      return new BinOp_ProperSubmultiset();
+    }
+    public static _IBinOp create_MultisetDisjoint() {
+      return new BinOp_MultisetDisjoint();
+    }
+    public static _IBinOp create_Concat() {
+      return new BinOp_Concat();
+    }
+    public static _IBinOp create_Passthrough(Dafny.ISequence<Dafny.Rune> _a0) {
+      return new BinOp_Passthrough(_a0);
+    }
+    public bool is_Eq { get { return this is BinOp_Eq; } }
+    public bool is_Div { get { return this is BinOp_Div; } }
+    public bool is_EuclidianDiv { get { return this is BinOp_EuclidianDiv; } }
+    public bool is_Mod { get { return this is BinOp_Mod; } }
+    public bool is_EuclidianMod { get { return this is BinOp_EuclidianMod; } }
+    public bool is_Lt { get { return this is BinOp_Lt; } }
+    public bool is_LtChar { get { return this is BinOp_LtChar; } }
+    public bool is_Plus { get { return this is BinOp_Plus; } }
+    public bool is_Minus { get { return this is BinOp_Minus; } }
+    public bool is_Times { get { return this is BinOp_Times; } }
+    public bool is_BitwiseAnd { get { return this is BinOp_BitwiseAnd; } }
+    public bool is_BitwiseOr { get { return this is BinOp_BitwiseOr; } }
+    public bool is_BitwiseXor { get { return this is BinOp_BitwiseXor; } }
+    public bool is_BitwiseShiftRight { get { return this is BinOp_BitwiseShiftRight; } }
+    public bool is_BitwiseShiftLeft { get { return this is BinOp_BitwiseShiftLeft; } }
+    public bool is_And { get { return this is BinOp_And; } }
+    public bool is_Or { get { return this is BinOp_Or; } }
+    public bool is_In { get { return this is BinOp_In; } }
+    public bool is_SeqProperPrefix { get { return this is BinOp_SeqProperPrefix; } }
+    public bool is_SeqPrefix { get { return this is BinOp_SeqPrefix; } }
+    public bool is_SetMerge { get { return this is BinOp_SetMerge; } }
+    public bool is_SetSubtraction { get { return this is BinOp_SetSubtraction; } }
+    public bool is_SetIntersection { get { return this is BinOp_SetIntersection; } }
+    public bool is_Subset { get { return this is BinOp_Subset; } }
+    public bool is_ProperSubset { get { return this is BinOp_ProperSubset; } }
+    public bool is_SetDisjoint { get { return this is BinOp_SetDisjoint; } }
+    public bool is_MapMerge { get { return this is BinOp_MapMerge; } }
+    public bool is_MapSubtraction { get { return this is BinOp_MapSubtraction; } }
+    public bool is_MultisetMerge { get { return this is BinOp_MultisetMerge; } }
+    public bool is_MultisetSubtraction { get { return this is BinOp_MultisetSubtraction; } }
+    public bool is_MultisetIntersection { get { return this is BinOp_MultisetIntersection; } }
+    public bool is_Submultiset { get { return this is BinOp_Submultiset; } }
+    public bool is_ProperSubmultiset { get { return this is BinOp_ProperSubmultiset; } }
+    public bool is_MultisetDisjoint { get { return this is BinOp_MultisetDisjoint; } }
+    public bool is_Concat { get { return this is BinOp_Concat; } }
+    public bool is_Passthrough { get { return this is BinOp_Passthrough; } }
+    public bool dtor_referential {
+      get {
+        var d = this;
+        return ((BinOp_Eq)d)._referential;
+      }
+    }
+    public bool dtor_nullable {
+      get {
+        var d = this;
+        return ((BinOp_Eq)d)._nullable;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_Passthrough_a0 {
+      get {
+        var d = this;
+        return ((BinOp_Passthrough)d)._a0;
+      }
+    }
+    public abstract _IBinOp DowncastClone();
+  }
+  public class BinOp_Eq : BinOp {
+    public readonly bool _referential;
+    public readonly bool _nullable;
+    public BinOp_Eq(bool referential, bool nullable) : base() {
+      this._referential = referential;
+      this._nullable = nullable;
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_Eq(_referential, _nullable);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_Eq;
+      return oth != null && this._referential == oth._referential && this._nullable == oth._nullable;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._referential));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._nullable));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.Eq";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._referential);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._nullable);
+      s += ")";
+      return s;
+    }
+  }
+  public class BinOp_Div : BinOp {
+    public BinOp_Div() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_Div();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_Div;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.Div";
+      return s;
+    }
+  }
+  public class BinOp_EuclidianDiv : BinOp {
+    public BinOp_EuclidianDiv() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_EuclidianDiv();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_EuclidianDiv;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 2;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.EuclidianDiv";
+      return s;
+    }
+  }
+  public class BinOp_Mod : BinOp {
+    public BinOp_Mod() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_Mod();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_Mod;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 3;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.Mod";
+      return s;
+    }
+  }
+  public class BinOp_EuclidianMod : BinOp {
+    public BinOp_EuclidianMod() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_EuclidianMod();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_EuclidianMod;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 4;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.EuclidianMod";
+      return s;
+    }
+  }
+  public class BinOp_Lt : BinOp {
+    public BinOp_Lt() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_Lt();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_Lt;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 5;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.Lt";
+      return s;
+    }
+  }
+  public class BinOp_LtChar : BinOp {
+    public BinOp_LtChar() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_LtChar();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_LtChar;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 6;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.LtChar";
+      return s;
+    }
+  }
+  public class BinOp_Plus : BinOp {
+    public BinOp_Plus() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_Plus();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_Plus;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 7;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.Plus";
+      return s;
+    }
+  }
+  public class BinOp_Minus : BinOp {
+    public BinOp_Minus() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_Minus();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_Minus;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 8;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.Minus";
+      return s;
+    }
+  }
+  public class BinOp_Times : BinOp {
+    public BinOp_Times() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_Times();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_Times;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 9;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.Times";
+      return s;
+    }
+  }
+  public class BinOp_BitwiseAnd : BinOp {
+    public BinOp_BitwiseAnd() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_BitwiseAnd();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_BitwiseAnd;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 10;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.BitwiseAnd";
+      return s;
+    }
+  }
+  public class BinOp_BitwiseOr : BinOp {
+    public BinOp_BitwiseOr() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_BitwiseOr();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_BitwiseOr;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 11;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.BitwiseOr";
+      return s;
+    }
+  }
+  public class BinOp_BitwiseXor : BinOp {
+    public BinOp_BitwiseXor() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_BitwiseXor();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_BitwiseXor;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 12;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.BitwiseXor";
+      return s;
+    }
+  }
+  public class BinOp_BitwiseShiftRight : BinOp {
+    public BinOp_BitwiseShiftRight() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_BitwiseShiftRight();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_BitwiseShiftRight;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 13;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.BitwiseShiftRight";
+      return s;
+    }
+  }
+  public class BinOp_BitwiseShiftLeft : BinOp {
+    public BinOp_BitwiseShiftLeft() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_BitwiseShiftLeft();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_BitwiseShiftLeft;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 14;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.BitwiseShiftLeft";
+      return s;
+    }
+  }
+  public class BinOp_And : BinOp {
+    public BinOp_And() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_And();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_And;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 15;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.And";
+      return s;
+    }
+  }
+  public class BinOp_Or : BinOp {
+    public BinOp_Or() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_Or();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_Or;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 16;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.Or";
+      return s;
+    }
+  }
+  public class BinOp_In : BinOp {
+    public BinOp_In() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_In();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_In;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 17;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.In";
+      return s;
+    }
+  }
+  public class BinOp_SeqProperPrefix : BinOp {
+    public BinOp_SeqProperPrefix() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_SeqProperPrefix();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_SeqProperPrefix;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 18;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.SeqProperPrefix";
+      return s;
+    }
+  }
+  public class BinOp_SeqPrefix : BinOp {
+    public BinOp_SeqPrefix() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_SeqPrefix();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_SeqPrefix;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 19;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.SeqPrefix";
+      return s;
+    }
+  }
+  public class BinOp_SetMerge : BinOp {
+    public BinOp_SetMerge() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_SetMerge();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_SetMerge;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 20;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.SetMerge";
+      return s;
+    }
+  }
+  public class BinOp_SetSubtraction : BinOp {
+    public BinOp_SetSubtraction() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_SetSubtraction();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_SetSubtraction;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 21;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.SetSubtraction";
+      return s;
+    }
+  }
+  public class BinOp_SetIntersection : BinOp {
+    public BinOp_SetIntersection() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_SetIntersection();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_SetIntersection;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 22;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.SetIntersection";
+      return s;
+    }
+  }
+  public class BinOp_Subset : BinOp {
+    public BinOp_Subset() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_Subset();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_Subset;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 23;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.Subset";
+      return s;
+    }
+  }
+  public class BinOp_ProperSubset : BinOp {
+    public BinOp_ProperSubset() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_ProperSubset();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_ProperSubset;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 24;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.ProperSubset";
+      return s;
+    }
+  }
+  public class BinOp_SetDisjoint : BinOp {
+    public BinOp_SetDisjoint() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_SetDisjoint();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_SetDisjoint;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 25;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.SetDisjoint";
+      return s;
+    }
+  }
+  public class BinOp_MapMerge : BinOp {
+    public BinOp_MapMerge() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_MapMerge();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_MapMerge;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 26;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.MapMerge";
+      return s;
+    }
+  }
+  public class BinOp_MapSubtraction : BinOp {
+    public BinOp_MapSubtraction() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_MapSubtraction();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_MapSubtraction;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 27;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.MapSubtraction";
+      return s;
+    }
+  }
+  public class BinOp_MultisetMerge : BinOp {
+    public BinOp_MultisetMerge() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_MultisetMerge();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_MultisetMerge;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 28;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.MultisetMerge";
+      return s;
+    }
+  }
+  public class BinOp_MultisetSubtraction : BinOp {
+    public BinOp_MultisetSubtraction() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_MultisetSubtraction();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_MultisetSubtraction;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 29;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.MultisetSubtraction";
+      return s;
+    }
+  }
+  public class BinOp_MultisetIntersection : BinOp {
+    public BinOp_MultisetIntersection() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_MultisetIntersection();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_MultisetIntersection;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 30;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.MultisetIntersection";
+      return s;
+    }
+  }
+  public class BinOp_Submultiset : BinOp {
+    public BinOp_Submultiset() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_Submultiset();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_Submultiset;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 31;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.Submultiset";
+      return s;
+    }
+  }
+  public class BinOp_ProperSubmultiset : BinOp {
+    public BinOp_ProperSubmultiset() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_ProperSubmultiset();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_ProperSubmultiset;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 32;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.ProperSubmultiset";
+      return s;
+    }
+  }
+  public class BinOp_MultisetDisjoint : BinOp {
+    public BinOp_MultisetDisjoint() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_MultisetDisjoint();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_MultisetDisjoint;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 33;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.MultisetDisjoint";
+      return s;
+    }
+  }
+  public class BinOp_Concat : BinOp {
+    public BinOp_Concat() : base() {
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_Concat();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_Concat;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 34;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.Concat";
+      return s;
+    }
+  }
+  public class BinOp_Passthrough : BinOp {
+    public readonly Dafny.ISequence<Dafny.Rune> _a0;
+    public BinOp_Passthrough(Dafny.ISequence<Dafny.Rune> _a0) : base() {
+      this._a0 = _a0;
+    }
+    public override _IBinOp DowncastClone() {
+      if (this is _IBinOp dt) { return dt; }
+      return new BinOp_Passthrough(_a0);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.BinOp_Passthrough;
+      return oth != null && object.Equals(this._a0, oth._a0);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 35;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.BinOp.Passthrough";
+      s += "(";
+      s += this._a0.ToVerbatimString(true);
+      s += ")";
+      return s;
+    }
+  }
+
+  public interface _IExpression {
+    bool is_Literal { get; }
+    bool is_Ident { get; }
+    bool is_Companion { get; }
+    bool is_Tuple { get; }
+    bool is_New { get; }
+    bool is_NewArray { get; }
+    bool is_DatatypeValue { get; }
+    bool is_Convert { get; }
+    bool is_SeqConstruct { get; }
+    bool is_SeqValue { get; }
+    bool is_SetValue { get; }
+    bool is_MultisetValue { get; }
+    bool is_MapValue { get; }
+    bool is_MapBuilder { get; }
+    bool is_SeqUpdate { get; }
+    bool is_MapUpdate { get; }
+    bool is_SetBuilder { get; }
+    bool is_ToMultiset { get; }
+    bool is_This { get; }
+    bool is_Ite { get; }
+    bool is_UnOp { get; }
+    bool is_BinOp { get; }
+    bool is_ArrayLen { get; }
+    bool is_MapKeys { get; }
+    bool is_MapValues { get; }
+    bool is_Select { get; }
+    bool is_SelectFn { get; }
+    bool is_Index { get; }
+    bool is_IndexRange { get; }
+    bool is_TupleSelect { get; }
+    bool is_Call { get; }
+    bool is_Lambda { get; }
+    bool is_BetaRedex { get; }
+    bool is_IIFE { get; }
+    bool is_Apply { get; }
+    bool is_TypeTest { get; }
+    bool is_InitializationValue { get; }
+    bool is_BoolBoundedPool { get; }
+    bool is_SetBoundedPool { get; }
+    bool is_SeqBoundedPool { get; }
+    bool is_IntRange { get; }
+    DAST._ILiteral dtor_Literal_a0 { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_Ident_a0 { get; }
+    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_Companion_a0 { get; }
+    Dafny.ISequence<DAST._IExpression> dtor_Tuple_a0 { get; }
+    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_path { get; }
+    Dafny.ISequence<DAST._IType> dtor_typeArgs { get; }
+    Dafny.ISequence<DAST._IExpression> dtor_args { get; }
+    Dafny.ISequence<DAST._IExpression> dtor_dims { get; }
+    DAST._IType dtor_typ { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_variant { get; }
+    bool dtor_isCo { get; }
+    Dafny.ISequence<_System._ITuple2<Dafny.ISequence<Dafny.Rune>, DAST._IExpression>> dtor_contents { get; }
+    DAST._IExpression dtor_value { get; }
+    DAST._IType dtor_from { get; }
+    DAST._IExpression dtor_length { get; }
+    DAST._IExpression dtor_elem { get; }
+    Dafny.ISequence<DAST._IExpression> dtor_elements { get; }
+    Dafny.ISequence<_System._ITuple2<DAST._IExpression, DAST._IExpression>> dtor_mapElems { get; }
+    DAST._IType dtor_keyType { get; }
+    DAST._IType dtor_valueType { get; }
+    DAST._IExpression dtor_expr { get; }
+    DAST._IExpression dtor_indexExpr { get; }
+    DAST._IType dtor_elemType { get; }
+    DAST._IExpression dtor_ToMultiset_a0 { get; }
+    DAST._IExpression dtor_cond { get; }
+    DAST._IExpression dtor_thn { get; }
+    DAST._IExpression dtor_els { get; }
+    DAST._IUnaryOp dtor_unOp { get; }
+    DAST.Format._IUnaryOpFormat dtor_format1 { get; }
+    DAST._IBinOp dtor_op { get; }
+    DAST._IExpression dtor_left { get; }
+    DAST._IExpression dtor_right { get; }
+    DAST.Format._IBinaryOpFormat dtor_format2 { get; }
+    BigInteger dtor_dim { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_field { get; }
+    bool dtor_isConstant { get; }
+    bool dtor_onDatatype { get; }
+    bool dtor_isStatic { get; }
+    BigInteger dtor_arity { get; }
+    DAST._ICollKind dtor_collKind { get; }
+    Dafny.ISequence<DAST._IExpression> dtor_indices { get; }
+    bool dtor_isArray { get; }
+    Std.Wrappers._IOption<DAST._IExpression> dtor_low { get; }
+    Std.Wrappers._IOption<DAST._IExpression> dtor_high { get; }
+    BigInteger dtor_index { get; }
+    DAST._IExpression dtor_on { get; }
+    DAST._ICallName dtor_callName { get; }
+    Dafny.ISequence<DAST._IFormal> dtor_params { get; }
+    DAST._IType dtor_retType { get; }
+    Dafny.ISequence<DAST._IStatement> dtor_body { get; }
+    Dafny.ISequence<_System._ITuple2<DAST._IFormal, DAST._IExpression>> dtor_values { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
+    DAST._IExpression dtor_iifeBody { get; }
+    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_dType { get; }
+    DAST._IExpression dtor_of { get; }
+    bool dtor_includeDuplicates { get; }
+    DAST._IExpression dtor_lo { get; }
+    DAST._IExpression dtor_hi { get; }
+    _IExpression DowncastClone();
+  }
+  public abstract class Expression : _IExpression {
+    public Expression() {
+    }
+    private static readonly DAST._IExpression theDefault = create_Literal(DAST.Literal.Default());
+    public static DAST._IExpression Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DAST._IExpression> _TYPE = new Dafny.TypeDescriptor<DAST._IExpression>(DAST.Expression.Default());
+    public static Dafny.TypeDescriptor<DAST._IExpression> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IExpression create_Literal(DAST._ILiteral _a0) {
+      return new Expression_Literal(_a0);
+    }
+    public static _IExpression create_Ident(Dafny.ISequence<Dafny.Rune> _a0) {
+      return new Expression_Ident(_a0);
+    }
+    public static _IExpression create_Companion(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _a0) {
+      return new Expression_Companion(_a0);
+    }
+    public static _IExpression create_Tuple(Dafny.ISequence<DAST._IExpression> _a0) {
+      return new Expression_Tuple(_a0);
+    }
+    public static _IExpression create_New(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> path, Dafny.ISequence<DAST._IType> typeArgs, Dafny.ISequence<DAST._IExpression> args) {
+      return new Expression_New(path, typeArgs, args);
+    }
+    public static _IExpression create_NewArray(Dafny.ISequence<DAST._IExpression> dims, DAST._IType typ) {
+      return new Expression_NewArray(dims, typ);
+    }
+    public static _IExpression create_DatatypeValue(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> path, Dafny.ISequence<DAST._IType> typeArgs, Dafny.ISequence<Dafny.Rune> variant, bool isCo, Dafny.ISequence<_System._ITuple2<Dafny.ISequence<Dafny.Rune>, DAST._IExpression>> contents) {
+      return new Expression_DatatypeValue(path, typeArgs, variant, isCo, contents);
+    }
+    public static _IExpression create_Convert(DAST._IExpression @value, DAST._IType @from, DAST._IType typ) {
+      return new Expression_Convert(@value, @from, typ);
+    }
+    public static _IExpression create_SeqConstruct(DAST._IExpression length, DAST._IExpression elem) {
+      return new Expression_SeqConstruct(length, elem);
+    }
+    public static _IExpression create_SeqValue(Dafny.ISequence<DAST._IExpression> elements, DAST._IType typ) {
+      return new Expression_SeqValue(elements, typ);
+    }
+    public static _IExpression create_SetValue(Dafny.ISequence<DAST._IExpression> elements) {
+      return new Expression_SetValue(elements);
+    }
+    public static _IExpression create_MultisetValue(Dafny.ISequence<DAST._IExpression> elements) {
+      return new Expression_MultisetValue(elements);
+    }
+    public static _IExpression create_MapValue(Dafny.ISequence<_System._ITuple2<DAST._IExpression, DAST._IExpression>> mapElems) {
+      return new Expression_MapValue(mapElems);
+    }
+    public static _IExpression create_MapBuilder(DAST._IType keyType, DAST._IType valueType) {
+      return new Expression_MapBuilder(keyType, valueType);
+    }
+    public static _IExpression create_SeqUpdate(DAST._IExpression expr, DAST._IExpression indexExpr, DAST._IExpression @value) {
+      return new Expression_SeqUpdate(expr, indexExpr, @value);
+    }
+    public static _IExpression create_MapUpdate(DAST._IExpression expr, DAST._IExpression indexExpr, DAST._IExpression @value) {
+      return new Expression_MapUpdate(expr, indexExpr, @value);
+    }
+    public static _IExpression create_SetBuilder(DAST._IType elemType) {
+      return new Expression_SetBuilder(elemType);
+    }
+    public static _IExpression create_ToMultiset(DAST._IExpression _a0) {
+      return new Expression_ToMultiset(_a0);
+    }
+    public static _IExpression create_This() {
+      return new Expression_This();
+    }
+    public static _IExpression create_Ite(DAST._IExpression cond, DAST._IExpression thn, DAST._IExpression els) {
+      return new Expression_Ite(cond, thn, els);
+    }
+    public static _IExpression create_UnOp(DAST._IUnaryOp unOp, DAST._IExpression expr, DAST.Format._IUnaryOpFormat format1) {
+      return new Expression_UnOp(unOp, expr, format1);
+    }
+    public static _IExpression create_BinOp(DAST._IBinOp op, DAST._IExpression left, DAST._IExpression right, DAST.Format._IBinaryOpFormat format2) {
+      return new Expression_BinOp(op, left, right, format2);
+    }
+    public static _IExpression create_ArrayLen(DAST._IExpression expr, BigInteger dim) {
+      return new Expression_ArrayLen(expr, dim);
+    }
+    public static _IExpression create_MapKeys(DAST._IExpression expr) {
+      return new Expression_MapKeys(expr);
+    }
+    public static _IExpression create_MapValues(DAST._IExpression expr) {
+      return new Expression_MapValues(expr);
+    }
+    public static _IExpression create_Select(DAST._IExpression expr, Dafny.ISequence<Dafny.Rune> field, bool isConstant, bool onDatatype) {
+      return new Expression_Select(expr, field, isConstant, onDatatype);
+    }
+    public static _IExpression create_SelectFn(DAST._IExpression expr, Dafny.ISequence<Dafny.Rune> field, bool onDatatype, bool isStatic, BigInteger arity) {
+      return new Expression_SelectFn(expr, field, onDatatype, isStatic, arity);
+    }
+    public static _IExpression create_Index(DAST._IExpression expr, DAST._ICollKind collKind, Dafny.ISequence<DAST._IExpression> indices) {
+      return new Expression_Index(expr, collKind, indices);
+    }
+    public static _IExpression create_IndexRange(DAST._IExpression expr, bool isArray, Std.Wrappers._IOption<DAST._IExpression> low, Std.Wrappers._IOption<DAST._IExpression> high) {
+      return new Expression_IndexRange(expr, isArray, low, high);
+    }
+    public static _IExpression create_TupleSelect(DAST._IExpression expr, BigInteger index) {
+      return new Expression_TupleSelect(expr, index);
+    }
+    public static _IExpression create_Call(DAST._IExpression @on, DAST._ICallName callName, Dafny.ISequence<DAST._IType> typeArgs, Dafny.ISequence<DAST._IExpression> args) {
+      return new Expression_Call(@on, callName, typeArgs, args);
+    }
+    public static _IExpression create_Lambda(Dafny.ISequence<DAST._IFormal> @params, DAST._IType retType, Dafny.ISequence<DAST._IStatement> body) {
+      return new Expression_Lambda(@params, retType, body);
+    }
+    public static _IExpression create_BetaRedex(Dafny.ISequence<_System._ITuple2<DAST._IFormal, DAST._IExpression>> values, DAST._IType retType, DAST._IExpression expr) {
+      return new Expression_BetaRedex(values, retType, expr);
+    }
+    public static _IExpression create_IIFE(Dafny.ISequence<Dafny.Rune> name, DAST._IType typ, DAST._IExpression @value, DAST._IExpression iifeBody) {
+      return new Expression_IIFE(name, typ, @value, iifeBody);
+    }
+    public static _IExpression create_Apply(DAST._IExpression expr, Dafny.ISequence<DAST._IExpression> args) {
+      return new Expression_Apply(expr, args);
+    }
+    public static _IExpression create_TypeTest(DAST._IExpression @on, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dType, Dafny.ISequence<Dafny.Rune> variant) {
+      return new Expression_TypeTest(@on, dType, variant);
+    }
+    public static _IExpression create_InitializationValue(DAST._IType typ) {
+      return new Expression_InitializationValue(typ);
+    }
+    public static _IExpression create_BoolBoundedPool() {
+      return new Expression_BoolBoundedPool();
+    }
+    public static _IExpression create_SetBoundedPool(DAST._IExpression of) {
+      return new Expression_SetBoundedPool(of);
+    }
+    public static _IExpression create_SeqBoundedPool(DAST._IExpression of, bool includeDuplicates) {
+      return new Expression_SeqBoundedPool(of, includeDuplicates);
+    }
+    public static _IExpression create_IntRange(DAST._IExpression lo, DAST._IExpression hi) {
+      return new Expression_IntRange(lo, hi);
+    }
+    public bool is_Literal { get { return this is Expression_Literal; } }
+    public bool is_Ident { get { return this is Expression_Ident; } }
+    public bool is_Companion { get { return this is Expression_Companion; } }
+    public bool is_Tuple { get { return this is Expression_Tuple; } }
+    public bool is_New { get { return this is Expression_New; } }
+    public bool is_NewArray { get { return this is Expression_NewArray; } }
+    public bool is_DatatypeValue { get { return this is Expression_DatatypeValue; } }
+    public bool is_Convert { get { return this is Expression_Convert; } }
+    public bool is_SeqConstruct { get { return this is Expression_SeqConstruct; } }
+    public bool is_SeqValue { get { return this is Expression_SeqValue; } }
+    public bool is_SetValue { get { return this is Expression_SetValue; } }
+    public bool is_MultisetValue { get { return this is Expression_MultisetValue; } }
+    public bool is_MapValue { get { return this is Expression_MapValue; } }
+    public bool is_MapBuilder { get { return this is Expression_MapBuilder; } }
+    public bool is_SeqUpdate { get { return this is Expression_SeqUpdate; } }
+    public bool is_MapUpdate { get { return this is Expression_MapUpdate; } }
+    public bool is_SetBuilder { get { return this is Expression_SetBuilder; } }
+    public bool is_ToMultiset { get { return this is Expression_ToMultiset; } }
+    public bool is_This { get { return this is Expression_This; } }
+    public bool is_Ite { get { return this is Expression_Ite; } }
+    public bool is_UnOp { get { return this is Expression_UnOp; } }
+    public bool is_BinOp { get { return this is Expression_BinOp; } }
+    public bool is_ArrayLen { get { return this is Expression_ArrayLen; } }
+    public bool is_MapKeys { get { return this is Expression_MapKeys; } }
+    public bool is_MapValues { get { return this is Expression_MapValues; } }
+    public bool is_Select { get { return this is Expression_Select; } }
+    public bool is_SelectFn { get { return this is Expression_SelectFn; } }
+    public bool is_Index { get { return this is Expression_Index; } }
+    public bool is_IndexRange { get { return this is Expression_IndexRange; } }
+    public bool is_TupleSelect { get { return this is Expression_TupleSelect; } }
+    public bool is_Call { get { return this is Expression_Call; } }
+    public bool is_Lambda { get { return this is Expression_Lambda; } }
+    public bool is_BetaRedex { get { return this is Expression_BetaRedex; } }
+    public bool is_IIFE { get { return this is Expression_IIFE; } }
+    public bool is_Apply { get { return this is Expression_Apply; } }
+    public bool is_TypeTest { get { return this is Expression_TypeTest; } }
+    public bool is_InitializationValue { get { return this is Expression_InitializationValue; } }
+    public bool is_BoolBoundedPool { get { return this is Expression_BoolBoundedPool; } }
+    public bool is_SetBoundedPool { get { return this is Expression_SetBoundedPool; } }
+    public bool is_SeqBoundedPool { get { return this is Expression_SeqBoundedPool; } }
+    public bool is_IntRange { get { return this is Expression_IntRange; } }
+    public DAST._ILiteral dtor_Literal_a0 {
+      get {
+        var d = this;
+        return ((Expression_Literal)d)._a0;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_Ident_a0 {
+      get {
+        var d = this;
+        return ((Expression_Ident)d)._a0;
+      }
+    }
+    public Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_Companion_a0 {
+      get {
+        var d = this;
+        return ((Expression_Companion)d)._a0;
+      }
+    }
+    public Dafny.ISequence<DAST._IExpression> dtor_Tuple_a0 {
+      get {
+        var d = this;
+        return ((Expression_Tuple)d)._a0;
+      }
+    }
+    public Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_path {
+      get {
+        var d = this;
+        if (d is Expression_New) { return ((Expression_New)d)._path; }
+        return ((Expression_DatatypeValue)d)._path;
+      }
+    }
+    public Dafny.ISequence<DAST._IType> dtor_typeArgs {
+      get {
+        var d = this;
+        if (d is Expression_New) { return ((Expression_New)d)._typeArgs; }
+        if (d is Expression_DatatypeValue) { return ((Expression_DatatypeValue)d)._typeArgs; }
+        return ((Expression_Call)d)._typeArgs;
+      }
+    }
+    public Dafny.ISequence<DAST._IExpression> dtor_args {
+      get {
+        var d = this;
+        if (d is Expression_New) { return ((Expression_New)d)._args; }
+        if (d is Expression_Call) { return ((Expression_Call)d)._args; }
+        return ((Expression_Apply)d)._args;
+      }
+    }
+    public Dafny.ISequence<DAST._IExpression> dtor_dims {
+      get {
+        var d = this;
+        return ((Expression_NewArray)d)._dims;
+      }
+    }
+    public DAST._IType dtor_typ {
+      get {
+        var d = this;
+        if (d is Expression_NewArray) { return ((Expression_NewArray)d)._typ; }
+        if (d is Expression_Convert) { return ((Expression_Convert)d)._typ; }
+        if (d is Expression_SeqValue) { return ((Expression_SeqValue)d)._typ; }
+        if (d is Expression_IIFE) { return ((Expression_IIFE)d)._typ; }
+        return ((Expression_InitializationValue)d)._typ;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_variant {
+      get {
+        var d = this;
+        if (d is Expression_DatatypeValue) { return ((Expression_DatatypeValue)d)._variant; }
+        return ((Expression_TypeTest)d)._variant;
+      }
+    }
+    public bool dtor_isCo {
+      get {
+        var d = this;
+        return ((Expression_DatatypeValue)d)._isCo;
+      }
+    }
+    public Dafny.ISequence<_System._ITuple2<Dafny.ISequence<Dafny.Rune>, DAST._IExpression>> dtor_contents {
+      get {
+        var d = this;
+        return ((Expression_DatatypeValue)d)._contents;
+      }
+    }
+    public DAST._IExpression dtor_value {
+      get {
+        var d = this;
+        if (d is Expression_Convert) { return ((Expression_Convert)d)._value; }
+        if (d is Expression_SeqUpdate) { return ((Expression_SeqUpdate)d)._value; }
+        if (d is Expression_MapUpdate) { return ((Expression_MapUpdate)d)._value; }
+        return ((Expression_IIFE)d)._value;
+      }
+    }
+    public DAST._IType dtor_from {
+      get {
+        var d = this;
+        return ((Expression_Convert)d)._from;
+      }
+    }
+    public DAST._IExpression dtor_length {
+      get {
+        var d = this;
+        return ((Expression_SeqConstruct)d)._length;
+      }
+    }
+    public DAST._IExpression dtor_elem {
+      get {
+        var d = this;
+        return ((Expression_SeqConstruct)d)._elem;
+      }
+    }
+    public Dafny.ISequence<DAST._IExpression> dtor_elements {
+      get {
+        var d = this;
+        if (d is Expression_SeqValue) { return ((Expression_SeqValue)d)._elements; }
+        if (d is Expression_SetValue) { return ((Expression_SetValue)d)._elements; }
+        return ((Expression_MultisetValue)d)._elements;
+      }
+    }
+    public Dafny.ISequence<_System._ITuple2<DAST._IExpression, DAST._IExpression>> dtor_mapElems {
+      get {
+        var d = this;
+        return ((Expression_MapValue)d)._mapElems;
+      }
+    }
+    public DAST._IType dtor_keyType {
+      get {
+        var d = this;
+        return ((Expression_MapBuilder)d)._keyType;
+      }
+    }
+    public DAST._IType dtor_valueType {
+      get {
+        var d = this;
+        return ((Expression_MapBuilder)d)._valueType;
+      }
+    }
+    public DAST._IExpression dtor_expr {
+      get {
+        var d = this;
+        if (d is Expression_SeqUpdate) { return ((Expression_SeqUpdate)d)._expr; }
+        if (d is Expression_MapUpdate) { return ((Expression_MapUpdate)d)._expr; }
+        if (d is Expression_UnOp) { return ((Expression_UnOp)d)._expr; }
+        if (d is Expression_ArrayLen) { return ((Expression_ArrayLen)d)._expr; }
+        if (d is Expression_MapKeys) { return ((Expression_MapKeys)d)._expr; }
+        if (d is Expression_MapValues) { return ((Expression_MapValues)d)._expr; }
+        if (d is Expression_Select) { return ((Expression_Select)d)._expr; }
+        if (d is Expression_SelectFn) { return ((Expression_SelectFn)d)._expr; }
+        if (d is Expression_Index) { return ((Expression_Index)d)._expr; }
+        if (d is Expression_IndexRange) { return ((Expression_IndexRange)d)._expr; }
+        if (d is Expression_TupleSelect) { return ((Expression_TupleSelect)d)._expr; }
+        if (d is Expression_BetaRedex) { return ((Expression_BetaRedex)d)._expr; }
+        return ((Expression_Apply)d)._expr;
+      }
+    }
+    public DAST._IExpression dtor_indexExpr {
+      get {
+        var d = this;
+        if (d is Expression_SeqUpdate) { return ((Expression_SeqUpdate)d)._indexExpr; }
+        return ((Expression_MapUpdate)d)._indexExpr;
+      }
+    }
+    public DAST._IType dtor_elemType {
+      get {
+        var d = this;
+        return ((Expression_SetBuilder)d)._elemType;
+      }
+    }
+    public DAST._IExpression dtor_ToMultiset_a0 {
+      get {
+        var d = this;
+        return ((Expression_ToMultiset)d)._a0;
+      }
+    }
+    public DAST._IExpression dtor_cond {
+      get {
+        var d = this;
+        return ((Expression_Ite)d)._cond;
+      }
+    }
+    public DAST._IExpression dtor_thn {
+      get {
+        var d = this;
+        return ((Expression_Ite)d)._thn;
+      }
+    }
+    public DAST._IExpression dtor_els {
+      get {
+        var d = this;
+        return ((Expression_Ite)d)._els;
+      }
+    }
+    public DAST._IUnaryOp dtor_unOp {
+      get {
+        var d = this;
+        return ((Expression_UnOp)d)._unOp;
+      }
+    }
+    public DAST.Format._IUnaryOpFormat dtor_format1 {
+      get {
+        var d = this;
+        return ((Expression_UnOp)d)._format1;
+      }
+    }
+    public DAST._IBinOp dtor_op {
+      get {
+        var d = this;
+        return ((Expression_BinOp)d)._op;
+      }
+    }
+    public DAST._IExpression dtor_left {
+      get {
+        var d = this;
+        return ((Expression_BinOp)d)._left;
+      }
+    }
+    public DAST._IExpression dtor_right {
+      get {
+        var d = this;
+        return ((Expression_BinOp)d)._right;
+      }
+    }
+    public DAST.Format._IBinaryOpFormat dtor_format2 {
+      get {
+        var d = this;
+        return ((Expression_BinOp)d)._format2;
+      }
+    }
+    public BigInteger dtor_dim {
+      get {
+        var d = this;
+        return ((Expression_ArrayLen)d)._dim;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_field {
+      get {
+        var d = this;
+        if (d is Expression_Select) { return ((Expression_Select)d)._field; }
+        return ((Expression_SelectFn)d)._field;
+      }
+    }
+    public bool dtor_isConstant {
+      get {
+        var d = this;
+        return ((Expression_Select)d)._isConstant;
+      }
+    }
+    public bool dtor_onDatatype {
+      get {
+        var d = this;
+        if (d is Expression_Select) { return ((Expression_Select)d)._onDatatype; }
+        return ((Expression_SelectFn)d)._onDatatype;
+      }
+    }
+    public bool dtor_isStatic {
+      get {
+        var d = this;
+        return ((Expression_SelectFn)d)._isStatic;
+      }
+    }
+    public BigInteger dtor_arity {
+      get {
+        var d = this;
+        return ((Expression_SelectFn)d)._arity;
+      }
+    }
+    public DAST._ICollKind dtor_collKind {
+      get {
+        var d = this;
+        return ((Expression_Index)d)._collKind;
+      }
+    }
+    public Dafny.ISequence<DAST._IExpression> dtor_indices {
+      get {
+        var d = this;
+        return ((Expression_Index)d)._indices;
+      }
+    }
+    public bool dtor_isArray {
+      get {
+        var d = this;
+        return ((Expression_IndexRange)d)._isArray;
+      }
+    }
+    public Std.Wrappers._IOption<DAST._IExpression> dtor_low {
+      get {
+        var d = this;
+        return ((Expression_IndexRange)d)._low;
+      }
+    }
+    public Std.Wrappers._IOption<DAST._IExpression> dtor_high {
+      get {
+        var d = this;
+        return ((Expression_IndexRange)d)._high;
+      }
+    }
+    public BigInteger dtor_index {
+      get {
+        var d = this;
+        return ((Expression_TupleSelect)d)._index;
+      }
+    }
+    public DAST._IExpression dtor_on {
+      get {
+        var d = this;
+        if (d is Expression_Call) { return ((Expression_Call)d)._on; }
+        return ((Expression_TypeTest)d)._on;
+      }
+    }
+    public DAST._ICallName dtor_callName {
+      get {
+        var d = this;
+        return ((Expression_Call)d)._callName;
+      }
+    }
+    public Dafny.ISequence<DAST._IFormal> dtor_params {
+      get {
+        var d = this;
+        return ((Expression_Lambda)d)._params;
+      }
+    }
+    public DAST._IType dtor_retType {
+      get {
+        var d = this;
+        if (d is Expression_Lambda) { return ((Expression_Lambda)d)._retType; }
+        return ((Expression_BetaRedex)d)._retType;
+      }
+    }
+    public Dafny.ISequence<DAST._IStatement> dtor_body {
+      get {
+        var d = this;
+        return ((Expression_Lambda)d)._body;
+      }
+    }
+    public Dafny.ISequence<_System._ITuple2<DAST._IFormal, DAST._IExpression>> dtor_values {
+      get {
+        var d = this;
+        return ((Expression_BetaRedex)d)._values;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_name {
+      get {
+        var d = this;
+        return ((Expression_IIFE)d)._name;
+      }
+    }
+    public DAST._IExpression dtor_iifeBody {
+      get {
+        var d = this;
+        return ((Expression_IIFE)d)._iifeBody;
+      }
+    }
+    public Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_dType {
+      get {
+        var d = this;
+        return ((Expression_TypeTest)d)._dType;
+      }
+    }
+    public DAST._IExpression dtor_of {
+      get {
+        var d = this;
+        if (d is Expression_SetBoundedPool) { return ((Expression_SetBoundedPool)d)._of; }
+        return ((Expression_SeqBoundedPool)d)._of;
+      }
+    }
+    public bool dtor_includeDuplicates {
+      get {
+        var d = this;
+        return ((Expression_SeqBoundedPool)d)._includeDuplicates;
+      }
+    }
+    public DAST._IExpression dtor_lo {
+      get {
+        var d = this;
+        return ((Expression_IntRange)d)._lo;
+      }
+    }
+    public DAST._IExpression dtor_hi {
+      get {
+        var d = this;
+        return ((Expression_IntRange)d)._hi;
+      }
+    }
+    public abstract _IExpression DowncastClone();
+  }
+  public class Expression_Literal : Expression {
+    public readonly DAST._ILiteral _a0;
+    public Expression_Literal(DAST._ILiteral _a0) : base() {
+      this._a0 = _a0;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_Literal(_a0);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_Literal;
+      return oth != null && object.Equals(this._a0, oth._a0);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.Literal";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._a0);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_Ident : Expression {
+    public readonly Dafny.ISequence<Dafny.Rune> _a0;
+    public Expression_Ident(Dafny.ISequence<Dafny.Rune> _a0) : base() {
+      this._a0 = _a0;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_Ident(_a0);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_Ident;
+      return oth != null && object.Equals(this._a0, oth._a0);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.Ident";
+      s += "(";
+      s += this._a0.ToVerbatimString(true);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_Companion : Expression {
+    public readonly Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _a0;
+    public Expression_Companion(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _a0) : base() {
+      this._a0 = _a0;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_Companion(_a0);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_Companion;
+      return oth != null && object.Equals(this._a0, oth._a0);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 2;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.Companion";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._a0);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_Tuple : Expression {
+    public readonly Dafny.ISequence<DAST._IExpression> _a0;
+    public Expression_Tuple(Dafny.ISequence<DAST._IExpression> _a0) : base() {
+      this._a0 = _a0;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_Tuple(_a0);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_Tuple;
+      return oth != null && object.Equals(this._a0, oth._a0);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 3;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.Tuple";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._a0);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_New : Expression {
+    public readonly Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _path;
+    public readonly Dafny.ISequence<DAST._IType> _typeArgs;
+    public readonly Dafny.ISequence<DAST._IExpression> _args;
+    public Expression_New(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> path, Dafny.ISequence<DAST._IType> typeArgs, Dafny.ISequence<DAST._IExpression> args) : base() {
+      this._path = path;
+      this._typeArgs = typeArgs;
+      this._args = args;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_New(_path, _typeArgs, _args);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_New;
+      return oth != null && object.Equals(this._path, oth._path) && object.Equals(this._typeArgs, oth._typeArgs) && object.Equals(this._args, oth._args);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 4;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._path));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeArgs));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._args));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.New";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._path);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._typeArgs);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._args);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_NewArray : Expression {
+    public readonly Dafny.ISequence<DAST._IExpression> _dims;
+    public readonly DAST._IType _typ;
+    public Expression_NewArray(Dafny.ISequence<DAST._IExpression> dims, DAST._IType typ) : base() {
+      this._dims = dims;
+      this._typ = typ;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_NewArray(_dims, _typ);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_NewArray;
+      return oth != null && object.Equals(this._dims, oth._dims) && object.Equals(this._typ, oth._typ);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 5;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._dims));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typ));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.NewArray";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._dims);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._typ);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_DatatypeValue : Expression {
+    public readonly Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _path;
+    public readonly Dafny.ISequence<DAST._IType> _typeArgs;
+    public readonly Dafny.ISequence<Dafny.Rune> _variant;
+    public readonly bool _isCo;
+    public readonly Dafny.ISequence<_System._ITuple2<Dafny.ISequence<Dafny.Rune>, DAST._IExpression>> _contents;
+    public Expression_DatatypeValue(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> path, Dafny.ISequence<DAST._IType> typeArgs, Dafny.ISequence<Dafny.Rune> variant, bool isCo, Dafny.ISequence<_System._ITuple2<Dafny.ISequence<Dafny.Rune>, DAST._IExpression>> contents) : base() {
+      this._path = path;
+      this._typeArgs = typeArgs;
+      this._variant = variant;
+      this._isCo = isCo;
+      this._contents = contents;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_DatatypeValue(_path, _typeArgs, _variant, _isCo, _contents);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_DatatypeValue;
+      return oth != null && object.Equals(this._path, oth._path) && object.Equals(this._typeArgs, oth._typeArgs) && object.Equals(this._variant, oth._variant) && this._isCo == oth._isCo && object.Equals(this._contents, oth._contents);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 6;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._path));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeArgs));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._variant));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._isCo));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._contents));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.DatatypeValue";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._path);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._typeArgs);
+      s += ", ";
+      s += this._variant.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._isCo);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._contents);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_Convert : Expression {
+    public readonly DAST._IExpression _value;
+    public readonly DAST._IType _from;
+    public readonly DAST._IType _typ;
+    public Expression_Convert(DAST._IExpression @value, DAST._IType @from, DAST._IType typ) : base() {
+      this._value = @value;
+      this._from = @from;
+      this._typ = typ;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_Convert(_value, _from, _typ);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_Convert;
+      return oth != null && object.Equals(this._value, oth._value) && object.Equals(this._from, oth._from) && object.Equals(this._typ, oth._typ);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 7;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._value));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._from));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typ));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.Convert";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._value);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._from);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._typ);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_SeqConstruct : Expression {
+    public readonly DAST._IExpression _length;
+    public readonly DAST._IExpression _elem;
+    public Expression_SeqConstruct(DAST._IExpression length, DAST._IExpression elem) : base() {
+      this._length = length;
+      this._elem = elem;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_SeqConstruct(_length, _elem);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_SeqConstruct;
+      return oth != null && object.Equals(this._length, oth._length) && object.Equals(this._elem, oth._elem);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 8;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._length));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._elem));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.SeqConstruct";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._length);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._elem);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_SeqValue : Expression {
+    public readonly Dafny.ISequence<DAST._IExpression> _elements;
+    public readonly DAST._IType _typ;
+    public Expression_SeqValue(Dafny.ISequence<DAST._IExpression> elements, DAST._IType typ) : base() {
+      this._elements = elements;
+      this._typ = typ;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_SeqValue(_elements, _typ);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_SeqValue;
+      return oth != null && object.Equals(this._elements, oth._elements) && object.Equals(this._typ, oth._typ);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 9;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._elements));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typ));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.SeqValue";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._elements);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._typ);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_SetValue : Expression {
+    public readonly Dafny.ISequence<DAST._IExpression> _elements;
+    public Expression_SetValue(Dafny.ISequence<DAST._IExpression> elements) : base() {
+      this._elements = elements;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_SetValue(_elements);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_SetValue;
+      return oth != null && object.Equals(this._elements, oth._elements);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 10;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._elements));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.SetValue";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._elements);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_MultisetValue : Expression {
+    public readonly Dafny.ISequence<DAST._IExpression> _elements;
+    public Expression_MultisetValue(Dafny.ISequence<DAST._IExpression> elements) : base() {
+      this._elements = elements;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_MultisetValue(_elements);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_MultisetValue;
+      return oth != null && object.Equals(this._elements, oth._elements);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 11;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._elements));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.MultisetValue";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._elements);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_MapValue : Expression {
+    public readonly Dafny.ISequence<_System._ITuple2<DAST._IExpression, DAST._IExpression>> _mapElems;
+    public Expression_MapValue(Dafny.ISequence<_System._ITuple2<DAST._IExpression, DAST._IExpression>> mapElems) : base() {
+      this._mapElems = mapElems;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_MapValue(_mapElems);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_MapValue;
+      return oth != null && object.Equals(this._mapElems, oth._mapElems);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 12;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._mapElems));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.MapValue";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._mapElems);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_MapBuilder : Expression {
+    public readonly DAST._IType _keyType;
+    public readonly DAST._IType _valueType;
+    public Expression_MapBuilder(DAST._IType keyType, DAST._IType valueType) : base() {
+      this._keyType = keyType;
+      this._valueType = valueType;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_MapBuilder(_keyType, _valueType);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_MapBuilder;
+      return oth != null && object.Equals(this._keyType, oth._keyType) && object.Equals(this._valueType, oth._valueType);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 13;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._keyType));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._valueType));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.MapBuilder";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._keyType);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._valueType);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_SeqUpdate : Expression {
+    public readonly DAST._IExpression _expr;
+    public readonly DAST._IExpression _indexExpr;
+    public readonly DAST._IExpression _value;
+    public Expression_SeqUpdate(DAST._IExpression expr, DAST._IExpression indexExpr, DAST._IExpression @value) : base() {
+      this._expr = expr;
+      this._indexExpr = indexExpr;
+      this._value = @value;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_SeqUpdate(_expr, _indexExpr, _value);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_SeqUpdate;
+      return oth != null && object.Equals(this._expr, oth._expr) && object.Equals(this._indexExpr, oth._indexExpr) && object.Equals(this._value, oth._value);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 14;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._indexExpr));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._value));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.SeqUpdate";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._expr);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._indexExpr);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._value);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_MapUpdate : Expression {
+    public readonly DAST._IExpression _expr;
+    public readonly DAST._IExpression _indexExpr;
+    public readonly DAST._IExpression _value;
+    public Expression_MapUpdate(DAST._IExpression expr, DAST._IExpression indexExpr, DAST._IExpression @value) : base() {
+      this._expr = expr;
+      this._indexExpr = indexExpr;
+      this._value = @value;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_MapUpdate(_expr, _indexExpr, _value);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_MapUpdate;
+      return oth != null && object.Equals(this._expr, oth._expr) && object.Equals(this._indexExpr, oth._indexExpr) && object.Equals(this._value, oth._value);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 15;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._indexExpr));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._value));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.MapUpdate";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._expr);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._indexExpr);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._value);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_SetBuilder : Expression {
+    public readonly DAST._IType _elemType;
+    public Expression_SetBuilder(DAST._IType elemType) : base() {
+      this._elemType = elemType;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_SetBuilder(_elemType);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_SetBuilder;
+      return oth != null && object.Equals(this._elemType, oth._elemType);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 16;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._elemType));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.SetBuilder";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._elemType);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_ToMultiset : Expression {
+    public readonly DAST._IExpression _a0;
+    public Expression_ToMultiset(DAST._IExpression _a0) : base() {
+      this._a0 = _a0;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_ToMultiset(_a0);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_ToMultiset;
+      return oth != null && object.Equals(this._a0, oth._a0);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 17;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.ToMultiset";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._a0);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_This : Expression {
+    public Expression_This() : base() {
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_This();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_This;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 18;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.This";
+      return s;
+    }
+  }
+  public class Expression_Ite : Expression {
+    public readonly DAST._IExpression _cond;
+    public readonly DAST._IExpression _thn;
+    public readonly DAST._IExpression _els;
+    public Expression_Ite(DAST._IExpression cond, DAST._IExpression thn, DAST._IExpression els) : base() {
+      this._cond = cond;
+      this._thn = thn;
+      this._els = els;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_Ite(_cond, _thn, _els);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_Ite;
+      return oth != null && object.Equals(this._cond, oth._cond) && object.Equals(this._thn, oth._thn) && object.Equals(this._els, oth._els);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 19;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._cond));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._thn));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._els));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.Ite";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._cond);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._thn);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._els);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_UnOp : Expression {
+    public readonly DAST._IUnaryOp _unOp;
+    public readonly DAST._IExpression _expr;
+    public readonly DAST.Format._IUnaryOpFormat _format1;
+    public Expression_UnOp(DAST._IUnaryOp unOp, DAST._IExpression expr, DAST.Format._IUnaryOpFormat format1) : base() {
+      this._unOp = unOp;
+      this._expr = expr;
+      this._format1 = format1;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_UnOp(_unOp, _expr, _format1);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_UnOp;
+      return oth != null && object.Equals(this._unOp, oth._unOp) && object.Equals(this._expr, oth._expr) && object.Equals(this._format1, oth._format1);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 20;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._unOp));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._format1));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.UnOp";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._unOp);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._expr);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._format1);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_BinOp : Expression {
+    public readonly DAST._IBinOp _op;
+    public readonly DAST._IExpression _left;
+    public readonly DAST._IExpression _right;
+    public readonly DAST.Format._IBinaryOpFormat _format2;
+    public Expression_BinOp(DAST._IBinOp op, DAST._IExpression left, DAST._IExpression right, DAST.Format._IBinaryOpFormat format2) : base() {
+      this._op = op;
+      this._left = left;
+      this._right = right;
+      this._format2 = format2;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_BinOp(_op, _left, _right, _format2);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_BinOp;
+      return oth != null && object.Equals(this._op, oth._op) && object.Equals(this._left, oth._left) && object.Equals(this._right, oth._right) && object.Equals(this._format2, oth._format2);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 21;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._op));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._left));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._right));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._format2));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.BinOp";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._op);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._left);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._right);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._format2);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_ArrayLen : Expression {
+    public readonly DAST._IExpression _expr;
+    public readonly BigInteger _dim;
+    public Expression_ArrayLen(DAST._IExpression expr, BigInteger dim) : base() {
+      this._expr = expr;
+      this._dim = dim;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_ArrayLen(_expr, _dim);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_ArrayLen;
+      return oth != null && object.Equals(this._expr, oth._expr) && this._dim == oth._dim;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 22;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._dim));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.ArrayLen";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._expr);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._dim);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_MapKeys : Expression {
+    public readonly DAST._IExpression _expr;
+    public Expression_MapKeys(DAST._IExpression expr) : base() {
+      this._expr = expr;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_MapKeys(_expr);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_MapKeys;
+      return oth != null && object.Equals(this._expr, oth._expr);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 23;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.MapKeys";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._expr);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_MapValues : Expression {
+    public readonly DAST._IExpression _expr;
+    public Expression_MapValues(DAST._IExpression expr) : base() {
+      this._expr = expr;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_MapValues(_expr);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_MapValues;
+      return oth != null && object.Equals(this._expr, oth._expr);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 24;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.MapValues";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._expr);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_Select : Expression {
+    public readonly DAST._IExpression _expr;
+    public readonly Dafny.ISequence<Dafny.Rune> _field;
+    public readonly bool _isConstant;
+    public readonly bool _onDatatype;
+    public Expression_Select(DAST._IExpression expr, Dafny.ISequence<Dafny.Rune> field, bool isConstant, bool onDatatype) : base() {
+      this._expr = expr;
+      this._field = field;
+      this._isConstant = isConstant;
+      this._onDatatype = onDatatype;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_Select(_expr, _field, _isConstant, _onDatatype);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_Select;
+      return oth != null && object.Equals(this._expr, oth._expr) && object.Equals(this._field, oth._field) && this._isConstant == oth._isConstant && this._onDatatype == oth._onDatatype;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 25;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._field));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._isConstant));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._onDatatype));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.Select";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._expr);
+      s += ", ";
+      s += this._field.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._isConstant);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._onDatatype);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_SelectFn : Expression {
+    public readonly DAST._IExpression _expr;
+    public readonly Dafny.ISequence<Dafny.Rune> _field;
+    public readonly bool _onDatatype;
+    public readonly bool _isStatic;
+    public readonly BigInteger _arity;
+    public Expression_SelectFn(DAST._IExpression expr, Dafny.ISequence<Dafny.Rune> field, bool onDatatype, bool isStatic, BigInteger arity) : base() {
+      this._expr = expr;
+      this._field = field;
+      this._onDatatype = onDatatype;
+      this._isStatic = isStatic;
+      this._arity = arity;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_SelectFn(_expr, _field, _onDatatype, _isStatic, _arity);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_SelectFn;
+      return oth != null && object.Equals(this._expr, oth._expr) && object.Equals(this._field, oth._field) && this._onDatatype == oth._onDatatype && this._isStatic == oth._isStatic && this._arity == oth._arity;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 26;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._field));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._onDatatype));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._isStatic));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._arity));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.SelectFn";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._expr);
+      s += ", ";
+      s += this._field.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._onDatatype);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._isStatic);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._arity);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_Index : Expression {
+    public readonly DAST._IExpression _expr;
+    public readonly DAST._ICollKind _collKind;
+    public readonly Dafny.ISequence<DAST._IExpression> _indices;
+    public Expression_Index(DAST._IExpression expr, DAST._ICollKind collKind, Dafny.ISequence<DAST._IExpression> indices) : base() {
+      this._expr = expr;
+      this._collKind = collKind;
+      this._indices = indices;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_Index(_expr, _collKind, _indices);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_Index;
+      return oth != null && object.Equals(this._expr, oth._expr) && object.Equals(this._collKind, oth._collKind) && object.Equals(this._indices, oth._indices);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 27;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._collKind));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._indices));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.Index";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._expr);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._collKind);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._indices);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_IndexRange : Expression {
+    public readonly DAST._IExpression _expr;
+    public readonly bool _isArray;
+    public readonly Std.Wrappers._IOption<DAST._IExpression> _low;
+    public readonly Std.Wrappers._IOption<DAST._IExpression> _high;
+    public Expression_IndexRange(DAST._IExpression expr, bool isArray, Std.Wrappers._IOption<DAST._IExpression> low, Std.Wrappers._IOption<DAST._IExpression> high) : base() {
+      this._expr = expr;
+      this._isArray = isArray;
+      this._low = low;
+      this._high = high;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_IndexRange(_expr, _isArray, _low, _high);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_IndexRange;
+      return oth != null && object.Equals(this._expr, oth._expr) && this._isArray == oth._isArray && object.Equals(this._low, oth._low) && object.Equals(this._high, oth._high);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 28;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._isArray));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._low));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._high));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.IndexRange";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._expr);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._isArray);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._low);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._high);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_TupleSelect : Expression {
+    public readonly DAST._IExpression _expr;
+    public readonly BigInteger _index;
+    public Expression_TupleSelect(DAST._IExpression expr, BigInteger index) : base() {
+      this._expr = expr;
+      this._index = index;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_TupleSelect(_expr, _index);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_TupleSelect;
+      return oth != null && object.Equals(this._expr, oth._expr) && this._index == oth._index;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 29;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._index));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.TupleSelect";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._expr);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._index);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_Call : Expression {
+    public readonly DAST._IExpression _on;
+    public readonly DAST._ICallName _callName;
+    public readonly Dafny.ISequence<DAST._IType> _typeArgs;
+    public readonly Dafny.ISequence<DAST._IExpression> _args;
+    public Expression_Call(DAST._IExpression @on, DAST._ICallName callName, Dafny.ISequence<DAST._IType> typeArgs, Dafny.ISequence<DAST._IExpression> args) : base() {
+      this._on = @on;
+      this._callName = callName;
+      this._typeArgs = typeArgs;
+      this._args = args;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_Call(_on, _callName, _typeArgs, _args);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_Call;
+      return oth != null && object.Equals(this._on, oth._on) && object.Equals(this._callName, oth._callName) && object.Equals(this._typeArgs, oth._typeArgs) && object.Equals(this._args, oth._args);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 30;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._on));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._callName));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeArgs));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._args));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.Call";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._on);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._callName);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._typeArgs);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._args);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_Lambda : Expression {
+    public readonly Dafny.ISequence<DAST._IFormal> _params;
+    public readonly DAST._IType _retType;
+    public readonly Dafny.ISequence<DAST._IStatement> _body;
+    public Expression_Lambda(Dafny.ISequence<DAST._IFormal> @params, DAST._IType retType, Dafny.ISequence<DAST._IStatement> body) : base() {
+      this._params = @params;
+      this._retType = retType;
+      this._body = body;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_Lambda(_params, _retType, _body);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_Lambda;
+      return oth != null && object.Equals(this._params, oth._params) && object.Equals(this._retType, oth._retType) && object.Equals(this._body, oth._body);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 31;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._params));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._retType));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.Lambda";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._params);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._retType);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._body);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_BetaRedex : Expression {
+    public readonly Dafny.ISequence<_System._ITuple2<DAST._IFormal, DAST._IExpression>> _values;
+    public readonly DAST._IType _retType;
+    public readonly DAST._IExpression _expr;
+    public Expression_BetaRedex(Dafny.ISequence<_System._ITuple2<DAST._IFormal, DAST._IExpression>> values, DAST._IType retType, DAST._IExpression expr) : base() {
+      this._values = values;
+      this._retType = retType;
+      this._expr = expr;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_BetaRedex(_values, _retType, _expr);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_BetaRedex;
+      return oth != null && object.Equals(this._values, oth._values) && object.Equals(this._retType, oth._retType) && object.Equals(this._expr, oth._expr);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 32;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._values));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._retType));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.BetaRedex";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._values);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._retType);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._expr);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_IIFE : Expression {
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public readonly DAST._IType _typ;
+    public readonly DAST._IExpression _value;
+    public readonly DAST._IExpression _iifeBody;
+    public Expression_IIFE(Dafny.ISequence<Dafny.Rune> name, DAST._IType typ, DAST._IExpression @value, DAST._IExpression iifeBody) : base() {
+      this._name = name;
+      this._typ = typ;
+      this._value = @value;
+      this._iifeBody = iifeBody;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_IIFE(_name, _typ, _value, _iifeBody);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_IIFE;
+      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._typ, oth._typ) && object.Equals(this._value, oth._value) && object.Equals(this._iifeBody, oth._iifeBody);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 33;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typ));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._value));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._iifeBody));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.IIFE";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._name);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._typ);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._value);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._iifeBody);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_Apply : Expression {
+    public readonly DAST._IExpression _expr;
+    public readonly Dafny.ISequence<DAST._IExpression> _args;
+    public Expression_Apply(DAST._IExpression expr, Dafny.ISequence<DAST._IExpression> args) : base() {
+      this._expr = expr;
+      this._args = args;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_Apply(_expr, _args);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_Apply;
+      return oth != null && object.Equals(this._expr, oth._expr) && object.Equals(this._args, oth._args);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 34;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._expr));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._args));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.Apply";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._expr);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._args);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_TypeTest : Expression {
+    public readonly DAST._IExpression _on;
+    public readonly Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _dType;
+    public readonly Dafny.ISequence<Dafny.Rune> _variant;
+    public Expression_TypeTest(DAST._IExpression @on, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dType, Dafny.ISequence<Dafny.Rune> variant) : base() {
+      this._on = @on;
+      this._dType = dType;
+      this._variant = variant;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_TypeTest(_on, _dType, _variant);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_TypeTest;
+      return oth != null && object.Equals(this._on, oth._on) && object.Equals(this._dType, oth._dType) && object.Equals(this._variant, oth._variant);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 35;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._on));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._dType));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._variant));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.TypeTest";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._on);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._dType);
+      s += ", ";
+      s += this._variant.ToVerbatimString(true);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_InitializationValue : Expression {
+    public readonly DAST._IType _typ;
+    public Expression_InitializationValue(DAST._IType typ) : base() {
+      this._typ = typ;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_InitializationValue(_typ);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_InitializationValue;
+      return oth != null && object.Equals(this._typ, oth._typ);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 36;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typ));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.InitializationValue";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._typ);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_BoolBoundedPool : Expression {
+    public Expression_BoolBoundedPool() : base() {
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_BoolBoundedPool();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_BoolBoundedPool;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 37;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.BoolBoundedPool";
+      return s;
+    }
+  }
+  public class Expression_SetBoundedPool : Expression {
+    public readonly DAST._IExpression _of;
+    public Expression_SetBoundedPool(DAST._IExpression of) : base() {
+      this._of = of;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_SetBoundedPool(_of);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_SetBoundedPool;
+      return oth != null && object.Equals(this._of, oth._of);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 38;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._of));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.SetBoundedPool";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._of);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_SeqBoundedPool : Expression {
+    public readonly DAST._IExpression _of;
+    public readonly bool _includeDuplicates;
+    public Expression_SeqBoundedPool(DAST._IExpression of, bool includeDuplicates) : base() {
+      this._of = of;
+      this._includeDuplicates = includeDuplicates;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_SeqBoundedPool(_of, _includeDuplicates);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_SeqBoundedPool;
+      return oth != null && object.Equals(this._of, oth._of) && this._includeDuplicates == oth._includeDuplicates;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 39;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._of));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._includeDuplicates));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.SeqBoundedPool";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._of);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._includeDuplicates);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expression_IntRange : Expression {
+    public readonly DAST._IExpression _lo;
+    public readonly DAST._IExpression _hi;
+    public Expression_IntRange(DAST._IExpression lo, DAST._IExpression hi) : base() {
+      this._lo = lo;
+      this._hi = hi;
+    }
+    public override _IExpression DowncastClone() {
+      if (this is _IExpression dt) { return dt; }
+      return new Expression_IntRange(_lo, _hi);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Expression_IntRange;
+      return oth != null && object.Equals(this._lo, oth._lo) && object.Equals(this._hi, oth._hi);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 40;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._lo));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._hi));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Expression.IntRange";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._lo);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._hi);
+      s += ")";
+      return s;
+    }
+  }
+
+  public interface _IUnaryOp {
+    bool is_Not { get; }
+    bool is_BitwiseNot { get; }
+    bool is_Cardinality { get; }
+    _IUnaryOp DowncastClone();
+  }
+  public abstract class UnaryOp : _IUnaryOp {
+    public UnaryOp() {
+    }
+    private static readonly DAST._IUnaryOp theDefault = create_Not();
+    public static DAST._IUnaryOp Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DAST._IUnaryOp> _TYPE = new Dafny.TypeDescriptor<DAST._IUnaryOp>(DAST.UnaryOp.Default());
+    public static Dafny.TypeDescriptor<DAST._IUnaryOp> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IUnaryOp create_Not() {
+      return new UnaryOp_Not();
+    }
+    public static _IUnaryOp create_BitwiseNot() {
+      return new UnaryOp_BitwiseNot();
+    }
+    public static _IUnaryOp create_Cardinality() {
+      return new UnaryOp_Cardinality();
+    }
+    public bool is_Not { get { return this is UnaryOp_Not; } }
+    public bool is_BitwiseNot { get { return this is UnaryOp_BitwiseNot; } }
+    public bool is_Cardinality { get { return this is UnaryOp_Cardinality; } }
+    public static System.Collections.Generic.IEnumerable<_IUnaryOp> AllSingletonConstructors {
+      get {
+        yield return UnaryOp.create_Not();
+        yield return UnaryOp.create_BitwiseNot();
+        yield return UnaryOp.create_Cardinality();
+      }
+    }
+    public abstract _IUnaryOp DowncastClone();
+  }
+  public class UnaryOp_Not : UnaryOp {
+    public UnaryOp_Not() : base() {
+    }
+    public override _IUnaryOp DowncastClone() {
+      if (this is _IUnaryOp dt) { return dt; }
+      return new UnaryOp_Not();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.UnaryOp_Not;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.UnaryOp.Not";
+      return s;
+    }
+  }
+  public class UnaryOp_BitwiseNot : UnaryOp {
+    public UnaryOp_BitwiseNot() : base() {
+    }
+    public override _IUnaryOp DowncastClone() {
+      if (this is _IUnaryOp dt) { return dt; }
+      return new UnaryOp_BitwiseNot();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.UnaryOp_BitwiseNot;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.UnaryOp.BitwiseNot";
+      return s;
+    }
+  }
+  public class UnaryOp_Cardinality : UnaryOp {
+    public UnaryOp_Cardinality() : base() {
+    }
+    public override _IUnaryOp DowncastClone() {
+      if (this is _IUnaryOp dt) { return dt; }
+      return new UnaryOp_Cardinality();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.UnaryOp_Cardinality;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 2;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.UnaryOp.Cardinality";
+      return s;
+    }
+  }
+
+  public interface _ILiteral {
+    bool is_BoolLiteral { get; }
+    bool is_IntLiteral { get; }
+    bool is_DecLiteral { get; }
+    bool is_StringLiteral { get; }
+    bool is_CharLiteral { get; }
+    bool is_Null { get; }
+    bool dtor_BoolLiteral_a0 { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_IntLiteral_a0 { get; }
+    DAST._IType dtor_IntLiteral_a1 { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_DecLiteral_a0 { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_DecLiteral_a1 { get; }
+    DAST._IType dtor_DecLiteral_a2 { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_StringLiteral_a0 { get; }
+    Dafny.Rune dtor_CharLiteral_a0 { get; }
+    DAST._IType dtor_Null_a0 { get; }
+    _ILiteral DowncastClone();
+  }
+  public abstract class Literal : _ILiteral {
+    public Literal() {
+    }
+    private static readonly DAST._ILiteral theDefault = create_BoolLiteral(false);
+    public static DAST._ILiteral Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DAST._ILiteral> _TYPE = new Dafny.TypeDescriptor<DAST._ILiteral>(DAST.Literal.Default());
+    public static Dafny.TypeDescriptor<DAST._ILiteral> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _ILiteral create_BoolLiteral(bool _a0) {
+      return new Literal_BoolLiteral(_a0);
+    }
+    public static _ILiteral create_IntLiteral(Dafny.ISequence<Dafny.Rune> _a0, DAST._IType _a1) {
+      return new Literal_IntLiteral(_a0, _a1);
+    }
+    public static _ILiteral create_DecLiteral(Dafny.ISequence<Dafny.Rune> _a0, Dafny.ISequence<Dafny.Rune> _a1, DAST._IType _a2) {
+      return new Literal_DecLiteral(_a0, _a1, _a2);
+    }
+    public static _ILiteral create_StringLiteral(Dafny.ISequence<Dafny.Rune> _a0) {
+      return new Literal_StringLiteral(_a0);
+    }
+    public static _ILiteral create_CharLiteral(Dafny.Rune _a0) {
+      return new Literal_CharLiteral(_a0);
+    }
+    public static _ILiteral create_Null(DAST._IType _a0) {
+      return new Literal_Null(_a0);
+    }
+    public bool is_BoolLiteral { get { return this is Literal_BoolLiteral; } }
+    public bool is_IntLiteral { get { return this is Literal_IntLiteral; } }
+    public bool is_DecLiteral { get { return this is Literal_DecLiteral; } }
+    public bool is_StringLiteral { get { return this is Literal_StringLiteral; } }
+    public bool is_CharLiteral { get { return this is Literal_CharLiteral; } }
+    public bool is_Null { get { return this is Literal_Null; } }
+    public bool dtor_BoolLiteral_a0 {
+      get {
+        var d = this;
+        return ((Literal_BoolLiteral)d)._a0;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_IntLiteral_a0 {
+      get {
+        var d = this;
+        return ((Literal_IntLiteral)d)._a0;
+      }
+    }
+    public DAST._IType dtor_IntLiteral_a1 {
+      get {
+        var d = this;
+        return ((Literal_IntLiteral)d)._a1;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_DecLiteral_a0 {
+      get {
+        var d = this;
+        return ((Literal_DecLiteral)d)._a0;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_DecLiteral_a1 {
+      get {
+        var d = this;
+        return ((Literal_DecLiteral)d)._a1;
+      }
+    }
+    public DAST._IType dtor_DecLiteral_a2 {
+      get {
+        var d = this;
+        return ((Literal_DecLiteral)d)._a2;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_StringLiteral_a0 {
+      get {
+        var d = this;
+        return ((Literal_StringLiteral)d)._a0;
+      }
+    }
+    public Dafny.Rune dtor_CharLiteral_a0 {
+      get {
+        var d = this;
+        return ((Literal_CharLiteral)d)._a0;
+      }
+    }
+    public DAST._IType dtor_Null_a0 {
+      get {
+        var d = this;
+        return ((Literal_Null)d)._a0;
+      }
+    }
+    public abstract _ILiteral DowncastClone();
+  }
+  public class Literal_BoolLiteral : Literal {
+    public readonly bool _a0;
+    public Literal_BoolLiteral(bool _a0) : base() {
+      this._a0 = _a0;
+    }
+    public override _ILiteral DowncastClone() {
+      if (this is _ILiteral dt) { return dt; }
+      return new Literal_BoolLiteral(_a0);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Literal_BoolLiteral;
+      return oth != null && this._a0 == oth._a0;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Literal.BoolLiteral";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._a0);
+      s += ")";
+      return s;
+    }
+  }
+  public class Literal_IntLiteral : Literal {
+    public readonly Dafny.ISequence<Dafny.Rune> _a0;
+    public readonly DAST._IType _a1;
+    public Literal_IntLiteral(Dafny.ISequence<Dafny.Rune> _a0, DAST._IType _a1) : base() {
+      this._a0 = _a0;
+      this._a1 = _a1;
+    }
+    public override _ILiteral DowncastClone() {
+      if (this is _ILiteral dt) { return dt; }
+      return new Literal_IntLiteral(_a0, _a1);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Literal_IntLiteral;
+      return oth != null && object.Equals(this._a0, oth._a0) && object.Equals(this._a1, oth._a1);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a1));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Literal.IntLiteral";
+      s += "(";
+      s += this._a0.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._a1);
+      s += ")";
+      return s;
+    }
+  }
+  public class Literal_DecLiteral : Literal {
+    public readonly Dafny.ISequence<Dafny.Rune> _a0;
+    public readonly Dafny.ISequence<Dafny.Rune> _a1;
+    public readonly DAST._IType _a2;
+    public Literal_DecLiteral(Dafny.ISequence<Dafny.Rune> _a0, Dafny.ISequence<Dafny.Rune> _a1, DAST._IType _a2) : base() {
+      this._a0 = _a0;
+      this._a1 = _a1;
+      this._a2 = _a2;
+    }
+    public override _ILiteral DowncastClone() {
+      if (this is _ILiteral dt) { return dt; }
+      return new Literal_DecLiteral(_a0, _a1, _a2);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Literal_DecLiteral;
+      return oth != null && object.Equals(this._a0, oth._a0) && object.Equals(this._a1, oth._a1) && object.Equals(this._a2, oth._a2);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 2;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a1));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a2));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Literal.DecLiteral";
+      s += "(";
+      s += this._a0.ToVerbatimString(true);
+      s += ", ";
+      s += this._a1.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._a2);
+      s += ")";
+      return s;
+    }
+  }
+  public class Literal_StringLiteral : Literal {
+    public readonly Dafny.ISequence<Dafny.Rune> _a0;
+    public Literal_StringLiteral(Dafny.ISequence<Dafny.Rune> _a0) : base() {
+      this._a0 = _a0;
+    }
+    public override _ILiteral DowncastClone() {
+      if (this is _ILiteral dt) { return dt; }
+      return new Literal_StringLiteral(_a0);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Literal_StringLiteral;
+      return oth != null && object.Equals(this._a0, oth._a0);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 3;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Literal.StringLiteral";
+      s += "(";
+      s += this._a0.ToVerbatimString(true);
+      s += ")";
+      return s;
+    }
+  }
+  public class Literal_CharLiteral : Literal {
+    public readonly Dafny.Rune _a0;
+    public Literal_CharLiteral(Dafny.Rune _a0) : base() {
+      this._a0 = _a0;
+    }
+    public override _ILiteral DowncastClone() {
+      if (this is _ILiteral dt) { return dt; }
+      return new Literal_CharLiteral(_a0);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Literal_CharLiteral;
+      return oth != null && this._a0 == oth._a0;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 4;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Literal.CharLiteral";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._a0);
+      s += ")";
+      return s;
+    }
+  }
+  public class Literal_Null : Literal {
+    public readonly DAST._IType _a0;
+    public Literal_Null(DAST._IType _a0) : base() {
+      this._a0 = _a0;
+    }
+    public override _ILiteral DowncastClone() {
+      if (this is _ILiteral dt) { return dt; }
+      return new Literal_Null(_a0);
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Literal_Null;
+      return oth != null && object.Equals(this._a0, oth._a0);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 5;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._a0));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DAST.Literal.Null";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._a0);
+      s += ")";
+      return s;
+    }
+  }
+} // end of namespace DAST
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/DAST_Format.cs b/Source/DafnyCore/GeneratedFromDafny/DAST_Format.cs
new file mode 100644
index 00000000000..2a515516949
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/DAST_Format.cs
@@ -0,0 +1,218 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace DAST.Format {
+
+
+  public interface _IUnaryOpFormat {
+    bool is_NoFormat { get; }
+    bool is_CombineFormat { get; }
+    _IUnaryOpFormat DowncastClone();
+  }
+  public abstract class UnaryOpFormat : _IUnaryOpFormat {
+    public UnaryOpFormat() {
+    }
+    private static readonly DAST.Format._IUnaryOpFormat theDefault = create_NoFormat();
+    public static DAST.Format._IUnaryOpFormat Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DAST.Format._IUnaryOpFormat> _TYPE = new Dafny.TypeDescriptor<DAST.Format._IUnaryOpFormat>(DAST.Format.UnaryOpFormat.Default());
+    public static Dafny.TypeDescriptor<DAST.Format._IUnaryOpFormat> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IUnaryOpFormat create_NoFormat() {
+      return new UnaryOpFormat_NoFormat();
+    }
+    public static _IUnaryOpFormat create_CombineFormat() {
+      return new UnaryOpFormat_CombineFormat();
+    }
+    public bool is_NoFormat { get { return this is UnaryOpFormat_NoFormat; } }
+    public bool is_CombineFormat { get { return this is UnaryOpFormat_CombineFormat; } }
+    public static System.Collections.Generic.IEnumerable<_IUnaryOpFormat> AllSingletonConstructors {
+      get {
+        yield return UnaryOpFormat.create_NoFormat();
+        yield return UnaryOpFormat.create_CombineFormat();
+      }
+    }
+    public abstract _IUnaryOpFormat DowncastClone();
+  }
+  public class UnaryOpFormat_NoFormat : UnaryOpFormat {
+    public UnaryOpFormat_NoFormat() : base() {
+    }
+    public override _IUnaryOpFormat DowncastClone() {
+      if (this is _IUnaryOpFormat dt) { return dt; }
+      return new UnaryOpFormat_NoFormat();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Format.UnaryOpFormat_NoFormat;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "Format.UnaryOpFormat.NoFormat";
+      return s;
+    }
+  }
+  public class UnaryOpFormat_CombineFormat : UnaryOpFormat {
+    public UnaryOpFormat_CombineFormat() : base() {
+    }
+    public override _IUnaryOpFormat DowncastClone() {
+      if (this is _IUnaryOpFormat dt) { return dt; }
+      return new UnaryOpFormat_CombineFormat();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Format.UnaryOpFormat_CombineFormat;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "Format.UnaryOpFormat.CombineFormat";
+      return s;
+    }
+  }
+
+  public interface _IBinaryOpFormat {
+    bool is_NoFormat { get; }
+    bool is_ImpliesFormat { get; }
+    bool is_EquivalenceFormat { get; }
+    bool is_ReverseFormat { get; }
+    _IBinaryOpFormat DowncastClone();
+  }
+  public abstract class BinaryOpFormat : _IBinaryOpFormat {
+    public BinaryOpFormat() {
+    }
+    private static readonly DAST.Format._IBinaryOpFormat theDefault = create_NoFormat();
+    public static DAST.Format._IBinaryOpFormat Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DAST.Format._IBinaryOpFormat> _TYPE = new Dafny.TypeDescriptor<DAST.Format._IBinaryOpFormat>(DAST.Format.BinaryOpFormat.Default());
+    public static Dafny.TypeDescriptor<DAST.Format._IBinaryOpFormat> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IBinaryOpFormat create_NoFormat() {
+      return new BinaryOpFormat_NoFormat();
+    }
+    public static _IBinaryOpFormat create_ImpliesFormat() {
+      return new BinaryOpFormat_ImpliesFormat();
+    }
+    public static _IBinaryOpFormat create_EquivalenceFormat() {
+      return new BinaryOpFormat_EquivalenceFormat();
+    }
+    public static _IBinaryOpFormat create_ReverseFormat() {
+      return new BinaryOpFormat_ReverseFormat();
+    }
+    public bool is_NoFormat { get { return this is BinaryOpFormat_NoFormat; } }
+    public bool is_ImpliesFormat { get { return this is BinaryOpFormat_ImpliesFormat; } }
+    public bool is_EquivalenceFormat { get { return this is BinaryOpFormat_EquivalenceFormat; } }
+    public bool is_ReverseFormat { get { return this is BinaryOpFormat_ReverseFormat; } }
+    public static System.Collections.Generic.IEnumerable<_IBinaryOpFormat> AllSingletonConstructors {
+      get {
+        yield return BinaryOpFormat.create_NoFormat();
+        yield return BinaryOpFormat.create_ImpliesFormat();
+        yield return BinaryOpFormat.create_EquivalenceFormat();
+        yield return BinaryOpFormat.create_ReverseFormat();
+      }
+    }
+    public abstract _IBinaryOpFormat DowncastClone();
+  }
+  public class BinaryOpFormat_NoFormat : BinaryOpFormat {
+    public BinaryOpFormat_NoFormat() : base() {
+    }
+    public override _IBinaryOpFormat DowncastClone() {
+      if (this is _IBinaryOpFormat dt) { return dt; }
+      return new BinaryOpFormat_NoFormat();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Format.BinaryOpFormat_NoFormat;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "Format.BinaryOpFormat.NoFormat";
+      return s;
+    }
+  }
+  public class BinaryOpFormat_ImpliesFormat : BinaryOpFormat {
+    public BinaryOpFormat_ImpliesFormat() : base() {
+    }
+    public override _IBinaryOpFormat DowncastClone() {
+      if (this is _IBinaryOpFormat dt) { return dt; }
+      return new BinaryOpFormat_ImpliesFormat();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Format.BinaryOpFormat_ImpliesFormat;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "Format.BinaryOpFormat.ImpliesFormat";
+      return s;
+    }
+  }
+  public class BinaryOpFormat_EquivalenceFormat : BinaryOpFormat {
+    public BinaryOpFormat_EquivalenceFormat() : base() {
+    }
+    public override _IBinaryOpFormat DowncastClone() {
+      if (this is _IBinaryOpFormat dt) { return dt; }
+      return new BinaryOpFormat_EquivalenceFormat();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Format.BinaryOpFormat_EquivalenceFormat;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 2;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "Format.BinaryOpFormat.EquivalenceFormat";
+      return s;
+    }
+  }
+  public class BinaryOpFormat_ReverseFormat : BinaryOpFormat {
+    public BinaryOpFormat_ReverseFormat() : base() {
+    }
+    public override _IBinaryOpFormat DowncastClone() {
+      if (this is _IBinaryOpFormat dt) { return dt; }
+      return new BinaryOpFormat_ReverseFormat();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DAST.Format.BinaryOpFormat_ReverseFormat;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 3;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "Format.BinaryOpFormat.ReverseFormat";
+      return s;
+    }
+  }
+} // end of namespace DAST.Format
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/DCOMP.cs b/Source/DafnyCore/GeneratedFromDafny/DCOMP.cs
new file mode 100644
index 00000000000..d3b5c63b221
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/DCOMP.cs
@@ -0,0 +1,11602 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace DCOMP {
+
+  public partial class __default {
+    public static bool is__tuple__numeric(Dafny.ISequence<Dafny.Rune> i) {
+      return ((((new BigInteger((i).Count)) >= (new BigInteger(2))) && (((i).Select(BigInteger.Zero)) == (new Dafny.Rune('_')))) && ((Dafny.Sequence<Dafny.Rune>.UnicodeFromString("0123456789")).Contains((i).Select(BigInteger.One)))) && (((new BigInteger((i).Count)) == (new BigInteger(2))) || (((new BigInteger((i).Count)) == (new BigInteger(3))) && ((Dafny.Sequence<Dafny.Rune>.UnicodeFromString("0123456789")).Contains((i).Select(new BigInteger(2))))));
+    }
+    public static bool has__special(Dafny.ISequence<Dafny.Rune> i) {
+    TAIL_CALL_START: ;
+      if ((new BigInteger((i).Count)).Sign == 0) {
+        return false;
+      } else if (((i).Select(BigInteger.Zero)) == (new Dafny.Rune('.'))) {
+        return true;
+      } else if (((i).Select(BigInteger.Zero)) == (new Dafny.Rune('#'))) {
+        return true;
+      } else if (((i).Select(BigInteger.Zero)) == (new Dafny.Rune('_'))) {
+        if ((new BigInteger(2)) <= (new BigInteger((i).Count))) {
+          if (((i).Select(BigInteger.One)) != (new Dafny.Rune('_'))) {
+            return true;
+          } else {
+            Dafny.ISequence<Dafny.Rune> _in113 = (i).Drop(new BigInteger(2));
+            i = _in113;
+            goto TAIL_CALL_START;
+          }
+        } else {
+          return true;
+        }
+      } else {
+        Dafny.ISequence<Dafny.Rune> _in114 = (i).Drop(BigInteger.One);
+        i = _in114;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static Dafny.ISequence<Dafny.Rune> idiomatic__rust(Dafny.ISequence<Dafny.Rune> i) {
+      Dafny.ISequence<Dafny.Rune> _1855___accumulator = Dafny.Sequence<Dafny.Rune>.FromElements();
+    TAIL_CALL_START: ;
+      if ((new BigInteger((i).Count)).Sign == 0) {
+        return Dafny.Sequence<Dafny.Rune>.Concat(_1855___accumulator, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""));
+      } else if (((i).Select(BigInteger.Zero)) == (new Dafny.Rune('_'))) {
+        _1855___accumulator = Dafny.Sequence<Dafny.Rune>.Concat(_1855___accumulator, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_"));
+        Dafny.ISequence<Dafny.Rune> _in115 = (i).Drop(new BigInteger(2));
+        i = _in115;
+        goto TAIL_CALL_START;
+      } else {
+        _1855___accumulator = Dafny.Sequence<Dafny.Rune>.Concat(_1855___accumulator, Dafny.Sequence<Dafny.Rune>.FromElements((i).Select(BigInteger.Zero)));
+        Dafny.ISequence<Dafny.Rune> _in116 = (i).Drop(BigInteger.One);
+        i = _in116;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static Dafny.ISequence<Dafny.Rune> replaceDots(Dafny.ISequence<Dafny.Rune> i) {
+      Dafny.ISequence<Dafny.Rune> _1856___accumulator = Dafny.Sequence<Dafny.Rune>.FromElements();
+    TAIL_CALL_START: ;
+      if ((new BigInteger((i).Count)).Sign == 0) {
+        return Dafny.Sequence<Dafny.Rune>.Concat(_1856___accumulator, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""));
+      } else if (((i).Select(BigInteger.Zero)) == (new Dafny.Rune('.'))) {
+        _1856___accumulator = Dafny.Sequence<Dafny.Rune>.Concat(_1856___accumulator, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_d"));
+        Dafny.ISequence<Dafny.Rune> _in117 = (i).Drop(BigInteger.One);
+        i = _in117;
+        goto TAIL_CALL_START;
+      } else {
+        _1856___accumulator = Dafny.Sequence<Dafny.Rune>.Concat(_1856___accumulator, Dafny.Sequence<Dafny.Rune>.FromElements((i).Select(BigInteger.Zero)));
+        Dafny.ISequence<Dafny.Rune> _in118 = (i).Drop(BigInteger.One);
+        i = _in118;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static bool is__tuple__builder(Dafny.ISequence<Dafny.Rune> i) {
+      return ((((new BigInteger((i).Count)) >= (new BigInteger(9))) && (((i).Take(new BigInteger(8))).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("___hMake")))) && ((Dafny.Sequence<Dafny.Rune>.UnicodeFromString("0123456789")).Contains((i).Select(new BigInteger(8))))) && (((new BigInteger((i).Count)) == (new BigInteger(9))) || (((new BigInteger((i).Count)) == (new BigInteger(10))) && ((Dafny.Sequence<Dafny.Rune>.UnicodeFromString("0123456789")).Contains((i).Select(new BigInteger(9))))));
+    }
+    public static Dafny.ISequence<Dafny.Rune> better__tuple__builder__name(Dafny.ISequence<Dafny.Rune> i) {
+      return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_T"), (i).Drop(new BigInteger(8)));
+    }
+    public static bool is__dafny__generated__id(Dafny.ISequence<Dafny.Rune> i) {
+      return ((((new BigInteger((i).Count)).Sign == 1) && (((i).Select(BigInteger.Zero)) == (new Dafny.Rune('_')))) && (!(DCOMP.__default.has__special((i).Drop(BigInteger.One))))) && (!((new BigInteger((i).Count)) >= (new BigInteger(2))) || (((i).Select(BigInteger.One)) != (new Dafny.Rune('T'))));
+    }
+    public static bool is__idiomatic__rust__id(Dafny.ISequence<Dafny.Rune> i) {
+      return (((new BigInteger((i).Count)).Sign == 1) && (!(DCOMP.__default.has__special(i)))) && (!(DCOMP.__default.reserved__rust).Contains(i));
+    }
+    public static Dafny.ISequence<Dafny.Rune> escapeIdent(Dafny.ISequence<Dafny.Rune> i) {
+      if (DCOMP.__default.is__tuple__numeric(i)) {
+        return i;
+      } else if (DCOMP.__default.is__tuple__builder(i)) {
+        return DCOMP.__default.better__tuple__builder__name(i);
+      } else if ((DCOMP.__default.reserved__rust).Contains(i)) {
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("r#"), i);
+      } else if (DCOMP.__default.is__idiomatic__rust__id(i)) {
+        return DCOMP.__default.idiomatic__rust(i);
+      } else if (DCOMP.__default.is__dafny__generated__id(i)) {
+        return i;
+      } else {
+        Dafny.ISequence<Dafny.Rune> _1857_r = DCOMP.__default.replaceDots(i);
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("r#_"), _1857_r);
+      }
+    }
+    public static Dafny.ISet<Dafny.ISequence<Dafny.Rune>> reserved__rust { get {
+      return Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("as"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("async"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("await"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("break"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("const"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("continue"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("crate"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("dyn"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("else"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("enum"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("extern"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("false"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("fn"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("for"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("if"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("impl"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("in"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("let"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("loop"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("match"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("mod"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("move"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("mut"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("pub"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("ref"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("return"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Self"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("self"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("static"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("struct"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("super"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("trait"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("true"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("type"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("union"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unsafe"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("use"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("where"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("while"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Keywords"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("The"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("abstract"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("become"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("box"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("do"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("final"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("macro"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("override"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("priv"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("try"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("typeof"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unsized"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("virtual"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("yield"));
+    } }
+    public static Dafny.ISequence<Dafny.Rune> IND { get {
+      return RAST.__default.IND;
+    } }
+  }
+
+  public interface _IOwnership {
+    bool is_OwnershipOwned { get; }
+    bool is_OwnershipBorrowed { get; }
+    bool is_OwnershipBorrowedMut { get; }
+    bool is_OwnershipAutoBorrowed { get; }
+    _IOwnership DowncastClone();
+  }
+  public abstract class Ownership : _IOwnership {
+    public Ownership() {
+    }
+    private static readonly DCOMP._IOwnership theDefault = create_OwnershipOwned();
+    public static DCOMP._IOwnership Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<DCOMP._IOwnership> _TYPE = new Dafny.TypeDescriptor<DCOMP._IOwnership>(DCOMP.Ownership.Default());
+    public static Dafny.TypeDescriptor<DCOMP._IOwnership> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IOwnership create_OwnershipOwned() {
+      return new Ownership_OwnershipOwned();
+    }
+    public static _IOwnership create_OwnershipBorrowed() {
+      return new Ownership_OwnershipBorrowed();
+    }
+    public static _IOwnership create_OwnershipBorrowedMut() {
+      return new Ownership_OwnershipBorrowedMut();
+    }
+    public static _IOwnership create_OwnershipAutoBorrowed() {
+      return new Ownership_OwnershipAutoBorrowed();
+    }
+    public bool is_OwnershipOwned { get { return this is Ownership_OwnershipOwned; } }
+    public bool is_OwnershipBorrowed { get { return this is Ownership_OwnershipBorrowed; } }
+    public bool is_OwnershipBorrowedMut { get { return this is Ownership_OwnershipBorrowedMut; } }
+    public bool is_OwnershipAutoBorrowed { get { return this is Ownership_OwnershipAutoBorrowed; } }
+    public static System.Collections.Generic.IEnumerable<_IOwnership> AllSingletonConstructors {
+      get {
+        yield return Ownership.create_OwnershipOwned();
+        yield return Ownership.create_OwnershipBorrowed();
+        yield return Ownership.create_OwnershipBorrowedMut();
+        yield return Ownership.create_OwnershipAutoBorrowed();
+      }
+    }
+    public abstract _IOwnership DowncastClone();
+  }
+  public class Ownership_OwnershipOwned : Ownership {
+    public Ownership_OwnershipOwned() : base() {
+    }
+    public override _IOwnership DowncastClone() {
+      if (this is _IOwnership dt) { return dt; }
+      return new Ownership_OwnershipOwned();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DCOMP.Ownership_OwnershipOwned;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DafnyToRustCompiler.Ownership.OwnershipOwned";
+      return s;
+    }
+  }
+  public class Ownership_OwnershipBorrowed : Ownership {
+    public Ownership_OwnershipBorrowed() : base() {
+    }
+    public override _IOwnership DowncastClone() {
+      if (this is _IOwnership dt) { return dt; }
+      return new Ownership_OwnershipBorrowed();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DCOMP.Ownership_OwnershipBorrowed;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DafnyToRustCompiler.Ownership.OwnershipBorrowed";
+      return s;
+    }
+  }
+  public class Ownership_OwnershipBorrowedMut : Ownership {
+    public Ownership_OwnershipBorrowedMut() : base() {
+    }
+    public override _IOwnership DowncastClone() {
+      if (this is _IOwnership dt) { return dt; }
+      return new Ownership_OwnershipBorrowedMut();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DCOMP.Ownership_OwnershipBorrowedMut;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 2;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DafnyToRustCompiler.Ownership.OwnershipBorrowedMut";
+      return s;
+    }
+  }
+  public class Ownership_OwnershipAutoBorrowed : Ownership {
+    public Ownership_OwnershipAutoBorrowed() : base() {
+    }
+    public override _IOwnership DowncastClone() {
+      if (this is _IOwnership dt) { return dt; }
+      return new Ownership_OwnershipAutoBorrowed();
+    }
+    public override bool Equals(object other) {
+      var oth = other as DCOMP.Ownership_OwnershipAutoBorrowed;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 3;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "DafnyToRustCompiler.Ownership.OwnershipAutoBorrowed";
+      return s;
+    }
+  }
+
+  public partial class COMP {
+    public COMP() {
+      this._UnicodeChars = false;
+    }
+    public void __ctor(bool UnicodeChars)
+    {
+      (this)._UnicodeChars = UnicodeChars;
+    }
+    public RAST._IMod GenModule(DAST._IModule mod, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> containingPath)
+    {
+      RAST._IMod s = RAST.Mod.Default();
+      Dafny.ISequence<RAST._IModDecl> _1858_body;
+      Dafny.ISequence<RAST._IModDecl> _out15;
+      _out15 = (this).GenModuleBody((mod).dtor_body, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Concat(containingPath, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements((mod).dtor_name)));
+      _1858_body = _out15;
+      s = (((mod).dtor_isExtern) ? (RAST.Mod.create_ExternMod(DCOMP.__default.escapeIdent((mod).dtor_name))) : (RAST.Mod.create_Mod(DCOMP.__default.escapeIdent((mod).dtor_name), _1858_body)));
+      return s;
+    }
+    public Dafny.ISequence<RAST._IModDecl> GenModuleBody(Dafny.ISequence<DAST._IModuleItem> body, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> containingPath)
+    {
+      Dafny.ISequence<RAST._IModDecl> s = Dafny.Sequence<RAST._IModDecl>.Empty;
+      s = Dafny.Sequence<RAST._IModDecl>.FromElements();
+      BigInteger _1859_i;
+      _1859_i = BigInteger.Zero;
+      while ((_1859_i) < (new BigInteger((body).Count))) {
+        Dafny.ISequence<RAST._IModDecl> _1860_generated = Dafny.Sequence<RAST._IModDecl>.Empty;
+        DAST._IModuleItem _source55 = (body).Select(_1859_i);
+        if (_source55.is_Module) {
+          DAST._IModule _1861___mcc_h0 = _source55.dtor_Module_a0;
+          DAST._IModule _1862_m = _1861___mcc_h0;
+          RAST._IMod _1863_mm;
+          RAST._IMod _out16;
+          _out16 = (this).GenModule(_1862_m, containingPath);
+          _1863_mm = _out16;
+          _1860_generated = Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_ModDecl(_1863_mm));
+        } else if (_source55.is_Class) {
+          DAST._IClass _1864___mcc_h1 = _source55.dtor_Class_a0;
+          DAST._IClass _1865_c = _1864___mcc_h1;
+          Dafny.ISequence<RAST._IModDecl> _out17;
+          _out17 = (this).GenClass(_1865_c, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Concat(containingPath, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements((_1865_c).dtor_name)));
+          _1860_generated = _out17;
+        } else if (_source55.is_Trait) {
+          DAST._ITrait _1866___mcc_h2 = _source55.dtor_Trait_a0;
+          DAST._ITrait _1867_t = _1866___mcc_h2;
+          Dafny.ISequence<Dafny.Rune> _1868_tt;
+          Dafny.ISequence<Dafny.Rune> _out18;
+          _out18 = (this).GenTrait(_1867_t, containingPath);
+          _1868_tt = _out18;
+          _1860_generated = Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_RawDecl(_1868_tt));
+        } else if (_source55.is_Newtype) {
+          DAST._INewtype _1869___mcc_h3 = _source55.dtor_Newtype_a0;
+          DAST._INewtype _1870_n = _1869___mcc_h3;
+          Dafny.ISequence<RAST._IModDecl> _out19;
+          _out19 = (this).GenNewtype(_1870_n);
+          _1860_generated = _out19;
+        } else {
+          DAST._IDatatype _1871___mcc_h4 = _source55.dtor_Datatype_a0;
+          DAST._IDatatype _1872_d = _1871___mcc_h4;
+          Dafny.ISequence<RAST._IModDecl> _out20;
+          _out20 = (this).GenDatatype(_1872_d);
+          _1860_generated = _out20;
+        }
+        s = Dafny.Sequence<RAST._IModDecl>.Concat(s, _1860_generated);
+        _1859_i = (_1859_i) + (BigInteger.One);
+      }
+      return s;
+    }
+    public void GenTypeParameters(Dafny.ISequence<DAST._IType> @params, out Dafny.ISet<DAST._IType> typeParamsSet, out Dafny.ISequence<RAST._ITypeParam> typeParams, out Dafny.ISequence<RAST._ITypeParam> constrainedTypeParams, out Dafny.ISequence<Dafny.Rune> whereConstraints)
+    {
+      typeParamsSet = Dafny.Set<DAST._IType>.Empty;
+      typeParams = Dafny.Sequence<RAST._ITypeParam>.Empty;
+      constrainedTypeParams = Dafny.Sequence<RAST._ITypeParam>.Empty;
+      whereConstraints = Dafny.Sequence<Dafny.Rune>.Empty;
+      typeParamsSet = Dafny.Set<DAST._IType>.FromElements();
+      typeParams = Dafny.Sequence<RAST._ITypeParam>.FromElements();
+      constrainedTypeParams = Dafny.Sequence<RAST._ITypeParam>.FromElements();
+      whereConstraints = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
+      BigInteger _1873_tpI;
+      _1873_tpI = BigInteger.Zero;
+      if ((new BigInteger((@params).Count)).Sign == 1) {
+        while ((_1873_tpI) < (new BigInteger((@params).Count))) {
+          DAST._IType _1874_tp;
+          _1874_tp = (@params).Select(_1873_tpI);
+          typeParamsSet = Dafny.Set<DAST._IType>.Union(typeParamsSet, Dafny.Set<DAST._IType>.FromElements(_1874_tp));
+          RAST._IType _1875_genTp;
+          RAST._IType _out21;
+          _out21 = (this).GenType(_1874_tp, false, false);
+          _1875_genTp = _out21;
+          typeParams = Dafny.Sequence<RAST._ITypeParam>.Concat(typeParams, Dafny.Sequence<RAST._ITypeParam>.FromElements(RAST.TypeParam.create((_1875_genTp)._ToString(DCOMP.__default.IND), Dafny.Sequence<RAST._IType>.FromElements())));
+          _1873_tpI = (_1873_tpI) + (BigInteger.One);
+        }
+      }
+      Dafny.ISequence<RAST._IType> _1876_baseConstraints;
+      _1876_baseConstraints = Dafny.Sequence<RAST._IType>.FromElements(RAST.__default.CloneTrait, RAST.__default.DafnyPrintTrait, RAST.__default.StaticTrait);
+      constrainedTypeParams = RAST.TypeParam.AddConstraintsMultiple(typeParams, _1876_baseConstraints);
+    }
+    public Dafny.ISequence<RAST._IModDecl> GenClass(DAST._IClass c, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> path)
+    {
+      Dafny.ISequence<RAST._IModDecl> s = Dafny.Sequence<RAST._IModDecl>.Empty;
+      Dafny.ISet<DAST._IType> _1877_typeParamsSet;
+      Dafny.ISequence<RAST._ITypeParam> _1878_sTypeParams;
+      Dafny.ISequence<RAST._ITypeParam> _1879_sConstrainedTypeParams;
+      Dafny.ISequence<Dafny.Rune> _1880_whereConstraints;
+      Dafny.ISet<DAST._IType> _out22;
+      Dafny.ISequence<RAST._ITypeParam> _out23;
+      Dafny.ISequence<RAST._ITypeParam> _out24;
+      Dafny.ISequence<Dafny.Rune> _out25;
+      (this).GenTypeParameters((c).dtor_typeParams, out _out22, out _out23, out _out24, out _out25);
+      _1877_typeParamsSet = _out22;
+      _1878_sTypeParams = _out23;
+      _1879_sConstrainedTypeParams = _out24;
+      _1880_whereConstraints = _out25;
+      Dafny.ISequence<Dafny.Rune> _1881_constrainedTypeParams;
+      _1881_constrainedTypeParams = RAST.TypeParam.ToStringMultiple(_1879_sConstrainedTypeParams, Dafny.Sequence<Dafny.Rune>.Concat(RAST.__default.IND, RAST.__default.IND));
+      Dafny.ISequence<RAST._IFormal> _1882_fields;
+      _1882_fields = Dafny.Sequence<RAST._IFormal>.FromElements();
+      Dafny.ISequence<RAST._IAssignIdentifier> _1883_fieldInits;
+      _1883_fieldInits = Dafny.Sequence<RAST._IAssignIdentifier>.FromElements();
+      BigInteger _1884_fieldI;
+      _1884_fieldI = BigInteger.Zero;
+      while ((_1884_fieldI) < (new BigInteger(((c).dtor_fields).Count))) {
+        DAST._IField _1885_field;
+        _1885_field = ((c).dtor_fields).Select(_1884_fieldI);
+        RAST._IType _1886_fieldType;
+        RAST._IType _out26;
+        _out26 = (this).GenType(((_1885_field).dtor_formal).dtor_typ, false, false);
+        _1886_fieldType = _out26;
+        _1882_fields = Dafny.Sequence<RAST._IFormal>.Concat(_1882_fields, Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("pub "), DCOMP.__default.escapeIdent(((_1885_field).dtor_formal).dtor_name)), RAST.Type.create_TypeApp(RAST.__default.refcell__type, Dafny.Sequence<RAST._IType>.FromElements(_1886_fieldType)))));
+        Std.Wrappers._IOption<DAST._IExpression> _source56 = (_1885_field).dtor_defaultValue;
+        if (_source56.is_None) {
+          {
+            _1883_fieldInits = Dafny.Sequence<RAST._IAssignIdentifier>.Concat(_1883_fieldInits, Dafny.Sequence<RAST._IAssignIdentifier>.FromElements(RAST.AssignIdentifier.create(DCOMP.__default.escapeIdent(((_1885_field).dtor_formal).dtor_name), RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::cell::RefCell::new(::std::default::Default::default())")))));
+          }
+        } else {
+          DAST._IExpression _1887___mcc_h0 = _source56.dtor_value;
+          DAST._IExpression _1888_e = _1887___mcc_h0;
+          {
+            RAST._IExpr _1889_eStr;
+            DCOMP._IOwnership _1890___v30;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1891___v31;
+            RAST._IExpr _out27;
+            DCOMP._IOwnership _out28;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out29;
+            (this).GenExpr(_1888_e, Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None(), Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(), DCOMP.Ownership.create_OwnershipOwned(), out _out27, out _out28, out _out29);
+            _1889_eStr = _out27;
+            _1890___v30 = _out28;
+            _1891___v31 = _out29;
+            _1883_fieldInits = Dafny.Sequence<RAST._IAssignIdentifier>.Concat(_1883_fieldInits, Dafny.Sequence<RAST._IAssignIdentifier>.FromElements(RAST.AssignIdentifier.create(DCOMP.__default.escapeIdent(((_1885_field).dtor_formal).dtor_name), RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::cell::RefCell::new("), (_1889_eStr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"))))));
+          }
+        }
+        _1884_fieldI = (_1884_fieldI) + (BigInteger.One);
+      }
+      BigInteger _1892_typeParamI;
+      _1892_typeParamI = BigInteger.Zero;
+      while ((_1892_typeParamI) < (new BigInteger(((c).dtor_typeParams).Count))) {
+        RAST._IType _1893_tpeGen;
+        RAST._IType _out30;
+        _out30 = (this).GenType(((c).dtor_typeParams).Select(_1892_typeParamI), false, false);
+        _1893_tpeGen = _out30;
+        _1882_fields = Dafny.Sequence<RAST._IFormal>.Concat(_1882_fields, Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_phantom_type_param_"), Std.Strings.__default.OfNat(_1892_typeParamI)), RAST.Type.create_TypeApp(((RAST.__default.std__type).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("marker"))).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("PhantomData")), Dafny.Sequence<RAST._IType>.FromElements(_1893_tpeGen)))));
+        _1883_fieldInits = Dafny.Sequence<RAST._IAssignIdentifier>.Concat(_1883_fieldInits, Dafny.Sequence<RAST._IAssignIdentifier>.FromElements(RAST.AssignIdentifier.create(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_phantom_type_param_"), Std.Strings.__default.OfNat(_1892_typeParamI)), RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::marker::PhantomData")))));
+        _1892_typeParamI = (_1892_typeParamI) + (BigInteger.One);
+      }
+      RAST._IStruct _1894_struct;
+      _1894_struct = RAST.Struct.create(Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(), DCOMP.__default.escapeIdent((c).dtor_name), _1878_sTypeParams, RAST.Formals.create_NamedFormals(_1882_fields));
+      Dafny.ISequence<RAST._IType> _1895_typeParamsAsTypes;
+      _1895_typeParamsAsTypes = Std.Collections.Seq.__default.Map<RAST._ITypeParam, RAST._IType>(((System.Func<RAST._ITypeParam, RAST._IType>)((_1896_typeParam) => {
+        return RAST.__default.RawType((_1896_typeParam).dtor_content);
+      })), _1878_sTypeParams);
+      s = Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_StructDecl(_1894_struct));
+      Dafny.ISequence<RAST._IImplMember> _1897_implBodyRaw;
+      Dafny.IMap<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>,Dafny.ISequence<RAST._IImplMember>> _1898_traitBodies;
+      Dafny.ISequence<RAST._IImplMember> _out31;
+      Dafny.IMap<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>,Dafny.ISequence<RAST._IImplMember>> _out32;
+      (this).GenClassImplBody((c).dtor_body, false, DAST.Type.create_Path(Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(), Dafny.Sequence<DAST._IType>.FromElements(), DAST.ResolvedType.create_Datatype(path)), _1877_typeParamsSet, out _out31, out _out32);
+      _1897_implBodyRaw = _out31;
+      _1898_traitBodies = _out32;
+      Dafny.ISequence<RAST._IImplMember> _1899_implBody;
+      _1899_implBody = Dafny.Sequence<RAST._IImplMember>.Concat(Dafny.Sequence<RAST._IImplMember>.FromElements(RAST.ImplMember.create_FnDecl(RAST.Visibility.create_PUB(), RAST.Fn.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("new"), Dafny.Sequence<RAST._ITypeParam>.FromElements(), Dafny.Sequence<RAST._IFormal>.FromElements(), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_SelfOwned()), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Std.Wrappers.Option<RAST._IExpr>.create_Some(RAST.Expr.create_StructBuild(DCOMP.__default.escapeIdent((c).dtor_name), _1883_fieldInits))))), _1897_implBodyRaw);
+      RAST._IImpl _1900_i;
+      _1900_i = RAST.Impl.create_Impl(_1879_sConstrainedTypeParams, RAST.Type.create_TypeApp(RAST.Type.create_TIdentifier(DCOMP.__default.escapeIdent((c).dtor_name)), _1895_typeParamsAsTypes), _1880_whereConstraints, _1899_implBody);
+      s = Dafny.Sequence<RAST._IModDecl>.Concat(s, Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_ImplDecl(_1900_i)));
+      if ((new BigInteger(((c).dtor_superClasses).Count)).Sign == 1) {
+        BigInteger _1901_i;
+        _1901_i = BigInteger.Zero;
+        while ((_1901_i) < (new BigInteger(((c).dtor_superClasses).Count))) {
+          DAST._IType _1902_superClass;
+          _1902_superClass = ((c).dtor_superClasses).Select(_1901_i);
+          DAST._IType _source57 = _1902_superClass;
+          if (_source57.is_Path) {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1903___mcc_h1 = _source57.dtor_Path_a0;
+            Dafny.ISequence<DAST._IType> _1904___mcc_h2 = _source57.dtor_typeArgs;
+            DAST._IResolvedType _1905___mcc_h3 = _source57.dtor_resolved;
+            DAST._IResolvedType _source58 = _1905___mcc_h3;
+            if (_source58.is_Datatype) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1906___mcc_h7 = _source58.dtor_path;
+            } else if (_source58.is_Trait) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1907___mcc_h9 = _source58.dtor_path;
+              Dafny.ISequence<DAST._IType> _1908_typeArgs = _1904___mcc_h2;
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1909_traitPath = _1903___mcc_h1;
+              {
+                Dafny.ISequence<Dafny.Rune> _1910_pathStr;
+                Dafny.ISequence<Dafny.Rune> _out33;
+                _out33 = DCOMP.COMP.GenPath(_1909_traitPath);
+                _1910_pathStr = _out33;
+                Dafny.ISequence<RAST._IType> _1911_typeArgs;
+                Dafny.ISequence<RAST._IType> _out34;
+                _out34 = (this).GenTypeArgs(_1908_typeArgs, false, false);
+                _1911_typeArgs = _out34;
+                Dafny.ISequence<RAST._IImplMember> _1912_body;
+                _1912_body = Dafny.Sequence<RAST._IImplMember>.FromElements();
+                if ((_1898_traitBodies).Contains(_1909_traitPath)) {
+                  _1912_body = Dafny.Map<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>, Dafny.ISequence<RAST._IImplMember>>.Select(_1898_traitBodies,_1909_traitPath);
+                }
+                Dafny.ISequence<Dafny.Rune> _1913_genSelfPath;
+                Dafny.ISequence<Dafny.Rune> _out35;
+                _out35 = DCOMP.COMP.GenPath(path);
+                _1913_genSelfPath = _out35;
+                RAST._IModDecl _1914_x;
+                _1914_x = RAST.ModDecl.create_ImplDecl(RAST.Impl.create_ImplFor(_1879_sConstrainedTypeParams, RAST.Type.create_TypeApp(RAST.Type.create_TIdentifier(_1910_pathStr), _1911_typeArgs), RAST.__default.Rc(RAST.Type.create_TypeApp(RAST.Type.create_TIdentifier(_1913_genSelfPath), _1895_typeParamsAsTypes)), _1880_whereConstraints, _1912_body));
+                s = Dafny.Sequence<RAST._IModDecl>.Concat(s, Dafny.Sequence<RAST._IModDecl>.FromElements(_1914_x));
+              }
+            } else {
+              DAST._IType _1915___mcc_h11 = _source58.dtor_baseType;
+              DAST._INewtypeRange _1916___mcc_h12 = _source58.dtor_range;
+              bool _1917___mcc_h13 = _source58.dtor_erase;
+            }
+          } else if (_source57.is_Nullable) {
+            DAST._IType _1918___mcc_h17 = _source57.dtor_Nullable_a0;
+          } else if (_source57.is_Tuple) {
+            Dafny.ISequence<DAST._IType> _1919___mcc_h19 = _source57.dtor_Tuple_a0;
+          } else if (_source57.is_Array) {
+            DAST._IType _1920___mcc_h21 = _source57.dtor_element;
+            BigInteger _1921___mcc_h22 = _source57.dtor_dims;
+          } else if (_source57.is_Seq) {
+            DAST._IType _1922___mcc_h25 = _source57.dtor_element;
+          } else if (_source57.is_Set) {
+            DAST._IType _1923___mcc_h27 = _source57.dtor_element;
+          } else if (_source57.is_Multiset) {
+            DAST._IType _1924___mcc_h29 = _source57.dtor_element;
+          } else if (_source57.is_Map) {
+            DAST._IType _1925___mcc_h31 = _source57.dtor_key;
+            DAST._IType _1926___mcc_h32 = _source57.dtor_value;
+          } else if (_source57.is_SetBuilder) {
+            DAST._IType _1927___mcc_h35 = _source57.dtor_element;
+          } else if (_source57.is_MapBuilder) {
+            DAST._IType _1928___mcc_h37 = _source57.dtor_key;
+            DAST._IType _1929___mcc_h38 = _source57.dtor_value;
+          } else if (_source57.is_Arrow) {
+            Dafny.ISequence<DAST._IType> _1930___mcc_h41 = _source57.dtor_args;
+            DAST._IType _1931___mcc_h42 = _source57.dtor_result;
+          } else if (_source57.is_Primitive) {
+            DAST._IPrimitive _1932___mcc_h45 = _source57.dtor_Primitive_a0;
+          } else if (_source57.is_Passthrough) {
+            Dafny.ISequence<Dafny.Rune> _1933___mcc_h47 = _source57.dtor_Passthrough_a0;
+          } else {
+            Dafny.ISequence<Dafny.Rune> _1934___mcc_h49 = _source57.dtor_TypeArg_a0;
+          }
+          _1901_i = (_1901_i) + (BigInteger.One);
+        }
+      }
+      RAST._IImpl _1935_d;
+      _1935_d = RAST.Impl.create_ImplFor(_1879_sConstrainedTypeParams, RAST.__default.DefaultTrait, RAST.Type.create_TypeApp(RAST.Type.create_TIdentifier(DCOMP.__default.escapeIdent((c).dtor_name)), _1895_typeParamsAsTypes), _1880_whereConstraints, Dafny.Sequence<RAST._IImplMember>.FromElements(RAST.ImplMember.create_FnDecl(RAST.Visibility.create_PRIV(), RAST.Fn.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("default"), Dafny.Sequence<RAST._ITypeParam>.FromElements(), Dafny.Sequence<RAST._IFormal>.FromElements(), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_SelfOwned()), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Std.Wrappers.Option<RAST._IExpr>.create_Some(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::new()"))))))));
+      Dafny.ISequence<RAST._IModDecl> _1936_defaultImpl;
+      _1936_defaultImpl = Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_ImplDecl(_1935_d));
+      RAST._IImpl _1937_p;
+      _1937_p = RAST.Impl.create_ImplFor(_1879_sConstrainedTypeParams, RAST.__default.DafnyPrintTrait, RAST.Type.create_TypeApp(RAST.Type.create_TIdentifier(DCOMP.__default.escapeIdent((c).dtor_name)), _1895_typeParamsAsTypes), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Dafny.Sequence<RAST._IImplMember>.FromElements(RAST.ImplMember.create_FnDecl(RAST.Visibility.create_PRIV(), RAST.Fn.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("fmt_print"), Dafny.Sequence<RAST._ITypeParam>.FromElements(), Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.self, RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_formatter"), RAST.__default.RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&mut ::std::fmt::Formatter"))), RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_in_seq"), RAST.__default.RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("bool")))), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.__default.RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("std::fmt::Result"))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Std.Wrappers.Option<RAST._IExpr>.create_Some(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("write!(_formatter, \""), ((c).dtor_enclosingModule)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), (c).dtor_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\")"))))))));
+      Dafny.ISequence<RAST._IModDecl> _1938_printImpl;
+      _1938_printImpl = Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_ImplDecl(_1937_p));
+      RAST._IImpl _1939_pp;
+      _1939_pp = RAST.Impl.create_ImplFor(_1878_sTypeParams, RAST.__default.RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::cmp::PartialEq")), RAST.Type.create_TypeApp(RAST.Type.create_TIdentifier(DCOMP.__default.escapeIdent((c).dtor_name)), _1895_typeParamsAsTypes), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Dafny.Sequence<RAST._IImplMember>.FromElements(RAST.ImplMember.create_FnDecl(RAST.Visibility.create_PRIV(), RAST.Fn.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("eq"), Dafny.Sequence<RAST._ITypeParam>.FromElements(), Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.self, RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("other"), RAST.__default.Self)), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.__default.RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("bool"))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Std.Wrappers.Option<RAST._IExpr>.create_Some(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ptr::eq(self, other)")))))));
+      Dafny.ISequence<RAST._IModDecl> _1940_ptrPartialEqImpl;
+      _1940_ptrPartialEqImpl = Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_ImplDecl(_1939_pp));
+      s = Dafny.Sequence<RAST._IModDecl>.Concat(Dafny.Sequence<RAST._IModDecl>.Concat(Dafny.Sequence<RAST._IModDecl>.Concat(s, _1936_defaultImpl), _1938_printImpl), _1940_ptrPartialEqImpl);
+      return s;
+    }
+    public Dafny.ISequence<Dafny.Rune> GenTrait(DAST._ITrait t, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> containingPath)
+    {
+      Dafny.ISequence<Dafny.Rune> s = Dafny.Sequence<Dafny.Rune>.Empty;
+      Dafny.ISet<DAST._IType> _1941_typeParamsSet;
+      _1941_typeParamsSet = Dafny.Set<DAST._IType>.FromElements();
+      Dafny.ISequence<RAST._IType> _1942_typeParams;
+      _1942_typeParams = Dafny.Sequence<RAST._IType>.FromElements();
+      BigInteger _1943_tpI;
+      _1943_tpI = BigInteger.Zero;
+      if ((new BigInteger(((t).dtor_typeParams).Count)).Sign == 1) {
+        while ((_1943_tpI) < (new BigInteger(((t).dtor_typeParams).Count))) {
+          DAST._IType _1944_tp;
+          _1944_tp = ((t).dtor_typeParams).Select(_1943_tpI);
+          _1941_typeParamsSet = Dafny.Set<DAST._IType>.Union(_1941_typeParamsSet, Dafny.Set<DAST._IType>.FromElements(_1944_tp));
+          RAST._IType _1945_genTp;
+          RAST._IType _out36;
+          _out36 = (this).GenType(_1944_tp, false, false);
+          _1945_genTp = _out36;
+          _1942_typeParams = Dafny.Sequence<RAST._IType>.Concat(_1942_typeParams, Dafny.Sequence<RAST._IType>.FromElements(_1945_genTp));
+          _1943_tpI = (_1943_tpI) + (BigInteger.One);
+        }
+      }
+      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1946_fullPath;
+      _1946_fullPath = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Concat(containingPath, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements((t).dtor_name));
+      Dafny.ISequence<RAST._IImplMember> _1947_implBody;
+      Dafny.IMap<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>,Dafny.ISequence<RAST._IImplMember>> _1948___v34;
+      Dafny.ISequence<RAST._IImplMember> _out37;
+      Dafny.IMap<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>,Dafny.ISequence<RAST._IImplMember>> _out38;
+      (this).GenClassImplBody((t).dtor_body, true, DAST.Type.create_Path(_1946_fullPath, Dafny.Sequence<DAST._IType>.FromElements(), DAST.ResolvedType.create_Trait(_1946_fullPath)), _1941_typeParamsSet, out _out37, out _out38);
+      _1947_implBody = _out37;
+      _1948___v34 = _out38;
+      s = (RAST.ModDecl.create_TraitDecl(RAST.Trait.create(Dafny.Sequence<RAST._ITypeParam>.FromElements(), RAST.Type.create_TypeApp(RAST.Type.create_TIdentifier(DCOMP.__default.escapeIdent((t).dtor_name)), _1942_typeParams), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), _1947_implBody)))._ToString(DCOMP.__default.IND);
+      return s;
+    }
+    public Dafny.ISequence<RAST._IModDecl> GenNewtype(DAST._INewtype c)
+    {
+      Dafny.ISequence<RAST._IModDecl> s = Dafny.Sequence<RAST._IModDecl>.Empty;
+      Dafny.ISet<DAST._IType> _1949_typeParamsSet;
+      Dafny.ISequence<RAST._ITypeParam> _1950_sTypeParams;
+      Dafny.ISequence<RAST._ITypeParam> _1951_sConstrainedTypeParams;
+      Dafny.ISequence<Dafny.Rune> _1952_whereConstraints;
+      Dafny.ISet<DAST._IType> _out39;
+      Dafny.ISequence<RAST._ITypeParam> _out40;
+      Dafny.ISequence<RAST._ITypeParam> _out41;
+      Dafny.ISequence<Dafny.Rune> _out42;
+      (this).GenTypeParameters((c).dtor_typeParams, out _out39, out _out40, out _out41, out _out42);
+      _1949_typeParamsSet = _out39;
+      _1950_sTypeParams = _out40;
+      _1951_sConstrainedTypeParams = _out41;
+      _1952_whereConstraints = _out42;
+      Dafny.ISequence<RAST._IType> _1953_typeParamsAsTypes;
+      _1953_typeParamsAsTypes = Std.Collections.Seq.__default.Map<RAST._ITypeParam, RAST._IType>(((System.Func<RAST._ITypeParam, RAST._IType>)((_1954_t) => {
+        return RAST.__default.RawType((_1954_t).dtor_content);
+      })), _1950_sTypeParams);
+      Dafny.ISequence<Dafny.Rune> _1955_constrainedTypeParams;
+      _1955_constrainedTypeParams = RAST.TypeParam.ToStringMultiple(_1951_sConstrainedTypeParams, Dafny.Sequence<Dafny.Rune>.Concat(RAST.__default.IND, RAST.__default.IND));
+      RAST._IType _1956_underlyingType = RAST.Type.Default();
+      Std.Wrappers._IOption<RAST._IType> _source59 = DCOMP.COMP.NewtypeToRustType((c).dtor_base, (c).dtor_range);
+      if (_source59.is_None) {
+        RAST._IType _out43;
+        _out43 = (this).GenType((c).dtor_base, false, false);
+        _1956_underlyingType = _out43;
+      } else {
+        RAST._IType _1957___mcc_h0 = _source59.dtor_value;
+        RAST._IType _1958_v = _1957___mcc_h0;
+        _1956_underlyingType = _1958_v;
+      }
+      s = Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_StructDecl(RAST.Struct.create(Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("#[derive(Clone, PartialEq)]"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("#[repr(transparent)]")), DCOMP.__default.escapeIdent((c).dtor_name), _1950_sTypeParams, RAST.Formals.create_NamelessFormals(Dafny.Sequence<RAST._INamelessFormal>.FromElements(RAST.NamelessFormal.create(RAST.Visibility.create_PUB(), _1956_underlyingType))))));
+      Dafny.ISequence<Dafny.Rune> _1959_fnBody;
+      _1959_fnBody = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
+      Std.Wrappers._IOption<DAST._IExpression> _source60 = (c).dtor_witnessExpr;
+      if (_source60.is_None) {
+        {
+          _1959_fnBody = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_1959_fnBody, DCOMP.__default.escapeIdent((c).dtor_name)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(::std::default::Default::default())"));
+        }
+      } else {
+        DAST._IExpression _1960___mcc_h1 = _source60.dtor_value;
+        DAST._IExpression _1961_e = _1960___mcc_h1;
+        {
+          RAST._IExpr _1962_eStr;
+          DCOMP._IOwnership _1963___v35;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1964___v36;
+          RAST._IExpr _out44;
+          DCOMP._IOwnership _out45;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out46;
+          (this).GenExpr(_1961_e, Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None(), Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(), DCOMP.Ownership.create_OwnershipOwned(), out _out44, out _out45, out _out46);
+          _1962_eStr = _out44;
+          _1963___v35 = _out45;
+          _1964___v36 = _out46;
+          _1959_fnBody = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_1959_fnBody, DCOMP.__default.escapeIdent((c).dtor_name)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), (_1962_eStr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")\n"));
+        }
+      }
+      RAST._IImplMember _1965_body;
+      _1965_body = RAST.ImplMember.create_FnDecl(RAST.Visibility.create_PRIV(), RAST.Fn.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("default"), Dafny.Sequence<RAST._ITypeParam>.FromElements(), Dafny.Sequence<RAST._IFormal>.FromElements(), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_SelfOwned()), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Std.Wrappers.Option<RAST._IExpr>.create_Some(RAST.Expr.create_RawExpr(_1959_fnBody))));
+      s = Dafny.Sequence<RAST._IModDecl>.Concat(s, Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_ImplDecl(RAST.Impl.create_ImplFor(_1951_sConstrainedTypeParams, RAST.__default.DefaultTrait, RAST.Type.create_TypeApp(RAST.Type.create_TIdentifier(DCOMP.__default.escapeIdent((c).dtor_name)), _1953_typeParamsAsTypes), _1952_whereConstraints, Dafny.Sequence<RAST._IImplMember>.FromElements(_1965_body)))));
+      s = Dafny.Sequence<RAST._IModDecl>.Concat(s, Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_ImplDecl(RAST.Impl.create_ImplFor(_1951_sConstrainedTypeParams, RAST.__default.DafnyPrintTrait, RAST.Type.create_TypeApp(RAST.Type.create_TIdentifier(DCOMP.__default.escapeIdent((c).dtor_name)), _1953_typeParamsAsTypes), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Dafny.Sequence<RAST._IImplMember>.FromElements(RAST.ImplMember.create_FnDecl(RAST.Visibility.create_PRIV(), RAST.Fn.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("fmt_print"), Dafny.Sequence<RAST._ITypeParam>.FromElements(), Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.self, RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_formatter"), RAST.__default.RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&mut ::std::fmt::Formatter"))), RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("in_seq"), RAST.__default.RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("bool")))), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.__default.RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::fmt::Result"))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Std.Wrappers.Option<RAST._IExpr>.create_Some(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyPrint::fmt_print(&self.0, _formatter, in_seq)"))))))))));
+      s = Dafny.Sequence<RAST._IModDecl>.Concat(s, Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_ImplDecl(RAST.Impl.create_ImplFor(_1951_sConstrainedTypeParams, RAST.__default.RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref")), RAST.Type.create_TypeApp(RAST.Type.create_TIdentifier(DCOMP.__default.escapeIdent((c).dtor_name)), _1953_typeParamsAsTypes), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Dafny.Sequence<RAST._IImplMember>.FromElements(RAST.ImplMember.create_RawImplMember(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("type Target = "), (_1956_underlyingType)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";"))), RAST.ImplMember.create_FnDecl(RAST.Visibility.create_PRIV(), RAST.Fn.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("deref"), Dafny.Sequence<RAST._ITypeParam>.FromElements(), Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.self), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.__default.RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&Self::Target"))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Std.Wrappers.Option<RAST._IExpr>.create_Some(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&self.0"))))))))));
+      return s;
+    }
+    public Dafny.ISequence<RAST._IModDecl> GenDatatype(DAST._IDatatype c)
+    {
+      Dafny.ISequence<RAST._IModDecl> s = Dafny.Sequence<RAST._IModDecl>.Empty;
+      Dafny.ISet<DAST._IType> _1966_typeParamsSet;
+      Dafny.ISequence<RAST._ITypeParam> _1967_sTypeParams;
+      Dafny.ISequence<RAST._ITypeParam> _1968_sConstrainedTypeParams;
+      Dafny.ISequence<Dafny.Rune> _1969_whereConstraints;
+      Dafny.ISet<DAST._IType> _out47;
+      Dafny.ISequence<RAST._ITypeParam> _out48;
+      Dafny.ISequence<RAST._ITypeParam> _out49;
+      Dafny.ISequence<Dafny.Rune> _out50;
+      (this).GenTypeParameters((c).dtor_typeParams, out _out47, out _out48, out _out49, out _out50);
+      _1966_typeParamsSet = _out47;
+      _1967_sTypeParams = _out48;
+      _1968_sConstrainedTypeParams = _out49;
+      _1969_whereConstraints = _out50;
+      Dafny.ISequence<RAST._IType> _1970_typeParamsAsTypes;
+      _1970_typeParamsAsTypes = Std.Collections.Seq.__default.Map<RAST._ITypeParam, RAST._IType>(((System.Func<RAST._ITypeParam, RAST._IType>)((_1971_t) => {
+        return RAST.__default.RawType((_1971_t).dtor_content);
+      })), _1967_sTypeParams);
+      Dafny.ISequence<Dafny.Rune> _1972_constrainedTypeParams;
+      _1972_constrainedTypeParams = RAST.TypeParam.ToStringMultiple(_1968_sConstrainedTypeParams, Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.IND, DCOMP.__default.IND));
+      Dafny.ISequence<RAST._IEnumCase> _1973_ctors;
+      _1973_ctors = Dafny.Sequence<RAST._IEnumCase>.FromElements();
+      BigInteger _1974_i;
+      _1974_i = BigInteger.Zero;
+      while ((_1974_i) < (new BigInteger(((c).dtor_ctors).Count))) {
+        DAST._IDatatypeCtor _1975_ctor;
+        _1975_ctor = ((c).dtor_ctors).Select(_1974_i);
+        Dafny.ISequence<RAST._IFormal> _1976_ctorArgs;
+        _1976_ctorArgs = Dafny.Sequence<RAST._IFormal>.FromElements();
+        BigInteger _1977_j;
+        _1977_j = BigInteger.Zero;
+        while ((_1977_j) < (new BigInteger(((_1975_ctor).dtor_args).Count))) {
+          DAST._IFormal _1978_formal;
+          _1978_formal = ((_1975_ctor).dtor_args).Select(_1977_j);
+          RAST._IType _1979_formalType;
+          RAST._IType _out51;
+          _out51 = (this).GenType((_1978_formal).dtor_typ, false, false);
+          _1979_formalType = _out51;
+          if ((c).dtor_isCo) {
+            _1976_ctorArgs = Dafny.Sequence<RAST._IFormal>.Concat(_1976_ctorArgs, Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.create(DCOMP.__default.escapeIdent((_1978_formal).dtor_name), RAST.Type.create_TypeApp((RAST.__default.dafny__runtime__type).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("LazyFieldWrapper")), Dafny.Sequence<RAST._IType>.FromElements(_1979_formalType)))));
+          } else {
+            _1976_ctorArgs = Dafny.Sequence<RAST._IFormal>.Concat(_1976_ctorArgs, Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.create(DCOMP.__default.escapeIdent((_1978_formal).dtor_name), _1979_formalType)));
+          }
+          _1977_j = (_1977_j) + (BigInteger.One);
+        }
+        _1973_ctors = Dafny.Sequence<RAST._IEnumCase>.Concat(_1973_ctors, Dafny.Sequence<RAST._IEnumCase>.FromElements(RAST.EnumCase.create(DCOMP.__default.escapeIdent((_1975_ctor).dtor_name), RAST.Formals.create_NamedFormals(_1976_ctorArgs))));
+        _1974_i = (_1974_i) + (BigInteger.One);
+      }
+      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _1980_selfPath;
+      _1980_selfPath = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements((c).dtor_name);
+      Dafny.ISequence<RAST._IImplMember> _1981_implBodyRaw;
+      Dafny.IMap<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>,Dafny.ISequence<RAST._IImplMember>> _1982_traitBodies;
+      Dafny.ISequence<RAST._IImplMember> _out52;
+      Dafny.IMap<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>,Dafny.ISequence<RAST._IImplMember>> _out53;
+      (this).GenClassImplBody((c).dtor_body, false, DAST.Type.create_Path(Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(), Dafny.Sequence<DAST._IType>.FromElements(), DAST.ResolvedType.create_Datatype(_1980_selfPath)), _1966_typeParamsSet, out _out52, out _out53);
+      _1981_implBodyRaw = _out52;
+      _1982_traitBodies = _out53;
+      Dafny.ISequence<RAST._IImplMember> _1983_implBody;
+      _1983_implBody = _1981_implBodyRaw;
+      _1974_i = BigInteger.Zero;
+      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _1984_emittedFields;
+      _1984_emittedFields = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+      while ((_1974_i) < (new BigInteger(((c).dtor_ctors).Count))) {
+        DAST._IDatatypeCtor _1985_ctor;
+        _1985_ctor = ((c).dtor_ctors).Select(_1974_i);
+        BigInteger _1986_j;
+        _1986_j = BigInteger.Zero;
+        while ((_1986_j) < (new BigInteger(((_1985_ctor).dtor_args).Count))) {
+          DAST._IFormal _1987_formal;
+          _1987_formal = ((_1985_ctor).dtor_args).Select(_1986_j);
+          if (!((_1984_emittedFields).Contains((_1987_formal).dtor_name))) {
+            _1984_emittedFields = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(_1984_emittedFields, Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements((_1987_formal).dtor_name));
+            RAST._IType _1988_formalType;
+            RAST._IType _out54;
+            _out54 = (this).GenType((_1987_formal).dtor_typ, false, false);
+            _1988_formalType = _out54;
+            Dafny.ISequence<RAST._IMatchCase> _1989_cases;
+            _1989_cases = Dafny.Sequence<RAST._IMatchCase>.FromElements();
+            BigInteger _1990_k;
+            _1990_k = BigInteger.Zero;
+            while ((_1990_k) < (new BigInteger(((c).dtor_ctors).Count))) {
+              DAST._IDatatypeCtor _1991_ctor2;
+              _1991_ctor2 = ((c).dtor_ctors).Select(_1990_k);
+              Dafny.ISequence<Dafny.Rune> _1992_pattern;
+              _1992_pattern = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::")), DCOMP.__default.escapeIdent((_1991_ctor2).dtor_name)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" { "));
+              Dafny.ISequence<Dafny.Rune> _1993_rhs = Dafny.Sequence<Dafny.Rune>.Empty;
+              BigInteger _1994_l;
+              _1994_l = BigInteger.Zero;
+              bool _1995_hasMatchingField;
+              _1995_hasMatchingField = false;
+              while ((_1994_l) < (new BigInteger(((_1991_ctor2).dtor_args).Count))) {
+                DAST._IFormal _1996_formal2;
+                _1996_formal2 = ((_1991_ctor2).dtor_args).Select(_1994_l);
+                if (((_1987_formal).dtor_name).Equals((_1996_formal2).dtor_name)) {
+                  _1995_hasMatchingField = true;
+                }
+                _1992_pattern = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_1992_pattern, DCOMP.__default.escapeIdent((_1996_formal2).dtor_name)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
+                _1994_l = (_1994_l) + (BigInteger.One);
+              }
+              _1992_pattern = Dafny.Sequence<Dafny.Rune>.Concat(_1992_pattern, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
+              if (_1995_hasMatchingField) {
+                if ((c).dtor_isCo) {
+                  _1993_rhs = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&"), DCOMP.__default.escapeIdent((_1987_formal).dtor_name)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0)"));
+                } else {
+                  _1993_rhs = Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((_1987_formal).dtor_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""));
+                }
+              } else {
+                _1993_rhs = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("panic!(\"field does not exist on this variant\")");
+              }
+              RAST._IMatchCase _1997_ctorMatch;
+              _1997_ctorMatch = RAST.MatchCase.create(_1992_pattern, RAST.Expr.create_RawExpr(_1993_rhs));
+              _1989_cases = Dafny.Sequence<RAST._IMatchCase>.Concat(_1989_cases, Dafny.Sequence<RAST._IMatchCase>.FromElements(_1997_ctorMatch));
+              _1990_k = (_1990_k) + (BigInteger.One);
+            }
+            if ((new BigInteger(((c).dtor_typeParams).Count)).Sign == 1) {
+              _1989_cases = Dafny.Sequence<RAST._IMatchCase>.Concat(_1989_cases, Dafny.Sequence<RAST._IMatchCase>.FromElements(RAST.MatchCase.create(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::_PhantomVariant(..)")), RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("panic!()")))));
+            }
+            RAST._IExpr _1998_methodBody;
+            _1998_methodBody = RAST.Expr.create_Match(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("self")), _1989_cases);
+            _1983_implBody = Dafny.Sequence<RAST._IImplMember>.Concat(_1983_implBody, Dafny.Sequence<RAST._IImplMember>.FromElements(RAST.ImplMember.create_FnDecl(RAST.Visibility.create_PUB(), RAST.Fn.create(DCOMP.__default.escapeIdent((_1987_formal).dtor_name), Dafny.Sequence<RAST._ITypeParam>.FromElements(), Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.self), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_Borrowed(_1988_formalType)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Std.Wrappers.Option<RAST._IExpr>.create_Some(_1998_methodBody)))));
+          }
+          _1986_j = (_1986_j) + (BigInteger.One);
+        }
+        _1974_i = (_1974_i) + (BigInteger.One);
+      }
+      if ((new BigInteger(((c).dtor_typeParams).Count)).Sign == 1) {
+        BigInteger _1999_typeI;
+        _1999_typeI = BigInteger.Zero;
+        Dafny.ISequence<RAST._IType> _2000_types;
+        _2000_types = Dafny.Sequence<RAST._IType>.FromElements();
+        while ((_1999_typeI) < (new BigInteger(((c).dtor_typeParams).Count))) {
+          RAST._IType _2001_genTp;
+          RAST._IType _out55;
+          _out55 = (this).GenType(((c).dtor_typeParams).Select(_1999_typeI), false, false);
+          _2001_genTp = _out55;
+          _2000_types = Dafny.Sequence<RAST._IType>.Concat(_2000_types, Dafny.Sequence<RAST._IType>.FromElements(RAST.Type.create_TypeApp(RAST.Type.create_TIdentifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::marker::PhantomData::")), Dafny.Sequence<RAST._IType>.FromElements(_2001_genTp))));
+          _1999_typeI = (_1999_typeI) + (BigInteger.One);
+        }
+        _1973_ctors = Dafny.Sequence<RAST._IEnumCase>.Concat(_1973_ctors, Dafny.Sequence<RAST._IEnumCase>.FromElements(RAST.EnumCase.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_PhantomVariant"), RAST.Formals.create_NamelessFormals(Std.Collections.Seq.__default.Map<RAST._IType, RAST._INamelessFormal>(((System.Func<RAST._IType, RAST._INamelessFormal>)((_2002_tpe) => {
+  return RAST.NamelessFormal.create(RAST.Visibility.create_PRIV(), _2002_tpe);
+})), _2000_types)))));
+      }
+      Dafny.ISequence<RAST._IModDecl> _2003_enumBody;
+      _2003_enumBody = Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_EnumDecl(RAST.Enum.create(Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("#[derive(PartialEq)]")), DCOMP.__default.escapeIdent((c).dtor_name), _1967_sTypeParams, _1973_ctors)), RAST.ModDecl.create_ImplDecl(RAST.Impl.create_Impl(_1968_sConstrainedTypeParams, RAST.Type.create_TypeApp(RAST.Type.create_TIdentifier(DCOMP.__default.escapeIdent((c).dtor_name)), _1970_typeParamsAsTypes), _1969_whereConstraints, _1983_implBody)));
+      _1974_i = BigInteger.Zero;
+      Dafny.ISequence<RAST._IMatchCase> _2004_printImplBodyCases;
+      _2004_printImplBodyCases = Dafny.Sequence<RAST._IMatchCase>.FromElements();
+      while ((_1974_i) < (new BigInteger(((c).dtor_ctors).Count))) {
+        DAST._IDatatypeCtor _2005_ctor;
+        _2005_ctor = ((c).dtor_ctors).Select(_1974_i);
+        Dafny.ISequence<Dafny.Rune> _2006_ctorMatch;
+        _2006_ctorMatch = Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((_2005_ctor).dtor_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" { "));
+        Dafny.ISequence<Dafny.Rune> _2007_modulePrefix;
+        _2007_modulePrefix = (((((c).dtor_enclosingModule)).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_module"))) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")) : (Dafny.Sequence<Dafny.Rune>.Concat(((c).dtor_enclosingModule), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("."))));
+        RAST._IExpr _2008_printRhs;
+        _2008_printRhs = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("write!(_formatter, \""), _2007_modulePrefix), (c).dtor_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent((_2005_ctor).dtor_name)), (((_2005_ctor).dtor_hasAnyArgs) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(\")?")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\")?")))));
+        BigInteger _2009_j;
+        _2009_j = BigInteger.Zero;
+        while ((_2009_j) < (new BigInteger(((_2005_ctor).dtor_args).Count))) {
+          DAST._IFormal _2010_formal;
+          _2010_formal = ((_2005_ctor).dtor_args).Select(_2009_j);
+          _2006_ctorMatch = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_2006_ctorMatch, DCOMP.__default.escapeIdent((_2010_formal).dtor_name)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
+          if ((_2009_j).Sign == 1) {
+            _2008_printRhs = (_2008_printRhs).Then(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("write!(_formatter, \", \")?")));
+          }
+          _2008_printRhs = (_2008_printRhs).Then(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyPrint::fmt_print("), DCOMP.__default.escapeIdent((_2010_formal).dtor_name)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", _formatter, false)?"))));
+          _2009_j = (_2009_j) + (BigInteger.One);
+        }
+        _2006_ctorMatch = Dafny.Sequence<Dafny.Rune>.Concat(_2006_ctorMatch, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
+        if ((_2005_ctor).dtor_hasAnyArgs) {
+          _2008_printRhs = (_2008_printRhs).Then(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("write!(_formatter, \")\")?")));
+        }
+        _2008_printRhs = (_2008_printRhs).Then(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Ok(())")));
+        _2004_printImplBodyCases = Dafny.Sequence<RAST._IMatchCase>.Concat(_2004_printImplBodyCases, Dafny.Sequence<RAST._IMatchCase>.FromElements(RAST.MatchCase.create(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::")), _2006_ctorMatch), RAST.Expr.create_Block(_2008_printRhs))));
+        _1974_i = (_1974_i) + (BigInteger.One);
+      }
+      if ((new BigInteger(((c).dtor_typeParams).Count)).Sign == 1) {
+        _2004_printImplBodyCases = Dafny.Sequence<RAST._IMatchCase>.Concat(_2004_printImplBodyCases, Dafny.Sequence<RAST._IMatchCase>.FromElements(RAST.MatchCase.create(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::_PhantomVariant(..)")), RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("{panic!()}")))));
+      }
+      RAST._IExpr _2011_printImplBody;
+      _2011_printImplBody = RAST.Expr.create_Match(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("self")), _2004_printImplBodyCases);
+      Dafny.ISequence<RAST._IModDecl> _2012_printImpl;
+      _2012_printImpl = Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_ImplDecl(RAST.Impl.create_ImplFor(_1968_sConstrainedTypeParams, RAST.__default.DafnyPrintTrait, RAST.Type.create_TypeApp(RAST.Type.create_TIdentifier(DCOMP.__default.escapeIdent((c).dtor_name)), _1970_typeParamsAsTypes), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Dafny.Sequence<RAST._IImplMember>.FromElements(RAST.ImplMember.create_FnDecl(RAST.Visibility.create_PRIV(), RAST.Fn.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("fmt_print"), Dafny.Sequence<RAST._ITypeParam>.FromElements(), Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.self, RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_formatter"), RAST.__default.RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&mut ::std::fmt::Formatter"))), RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_in_seq"), RAST.__default.RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("bool")))), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.__default.RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("std::fmt::Result"))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Std.Wrappers.Option<RAST._IExpr>.create_Some(_2011_printImplBody)))))));
+      Dafny.ISequence<RAST._IModDecl> _2013_defaultImpl;
+      _2013_defaultImpl = Dafny.Sequence<RAST._IModDecl>.FromElements();
+      if ((new BigInteger(((c).dtor_ctors).Count)).Sign == 1) {
+        _1974_i = BigInteger.Zero;
+        Dafny.ISequence<Dafny.Rune> _2014_structName;
+        _2014_structName = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(DCOMP.__default.escapeIdent((c).dtor_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::")), DCOMP.__default.escapeIdent((((c).dtor_ctors).Select(BigInteger.Zero)).dtor_name));
+        Dafny.ISequence<RAST._IAssignIdentifier> _2015_structAssignments;
+        _2015_structAssignments = Dafny.Sequence<RAST._IAssignIdentifier>.FromElements();
+        while ((_1974_i) < (new BigInteger(((((c).dtor_ctors).Select(BigInteger.Zero)).dtor_args).Count))) {
+          DAST._IFormal _2016_formal;
+          _2016_formal = ((((c).dtor_ctors).Select(BigInteger.Zero)).dtor_args).Select(_1974_i);
+          _2015_structAssignments = Dafny.Sequence<RAST._IAssignIdentifier>.Concat(_2015_structAssignments, Dafny.Sequence<RAST._IAssignIdentifier>.FromElements(RAST.AssignIdentifier.create(DCOMP.__default.escapeIdent((_2016_formal).dtor_name), RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::default::Default::default()")))));
+          _1974_i = (_1974_i) + (BigInteger.One);
+        }
+        Dafny.ISequence<RAST._ITypeParam> _2017_defaultConstrainedTypeParams;
+        _2017_defaultConstrainedTypeParams = RAST.TypeParam.AddConstraintsMultiple(_1967_sTypeParams, Dafny.Sequence<RAST._IType>.FromElements(RAST.__default.DefaultTrait));
+        _2013_defaultImpl = Dafny.Sequence<RAST._IModDecl>.FromElements(RAST.ModDecl.create_ImplDecl(RAST.Impl.create_ImplFor(_2017_defaultConstrainedTypeParams, RAST.__default.DefaultTrait, RAST.Type.create_TypeApp(RAST.Type.create_TIdentifier(DCOMP.__default.escapeIdent((c).dtor_name)), _1970_typeParamsAsTypes), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Dafny.Sequence<RAST._IImplMember>.FromElements(RAST.ImplMember.create_FnDecl(RAST.Visibility.create_PRIV(), RAST.Fn.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("default"), Dafny.Sequence<RAST._ITypeParam>.FromElements(), Dafny.Sequence<RAST._IFormal>.FromElements(), Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_SelfOwned()), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Std.Wrappers.Option<RAST._IExpr>.create_Some(RAST.Expr.create_StructBuild(_2014_structName, _2015_structAssignments))))))));
+      }
+      s = Dafny.Sequence<RAST._IModDecl>.Concat(Dafny.Sequence<RAST._IModDecl>.Concat(_2003_enumBody, _2012_printImpl), _2013_defaultImpl);
+      return s;
+    }
+    public static Dafny.ISequence<Dafny.Rune> GenPath(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> p)
+    {
+      Dafny.ISequence<Dafny.Rune> s = Dafny.Sequence<Dafny.Rune>.Empty;
+      if ((new BigInteger((p).Count)).Sign == 0) {
+        s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Self");
+        return s;
+      } else {
+        s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("super::");
+        BigInteger _2018_i;
+        _2018_i = BigInteger.Zero;
+        while ((_2018_i) < (new BigInteger((p).Count))) {
+          if ((_2018_i).Sign == 1) {
+            s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::"));
+          }
+          s = Dafny.Sequence<Dafny.Rune>.Concat(s, DCOMP.__default.escapeIdent(((p).Select(_2018_i))));
+          _2018_i = (_2018_i) + (BigInteger.One);
+        }
+      }
+      return s;
+    }
+    public Dafny.ISequence<RAST._IType> GenTypeArgs(Dafny.ISequence<DAST._IType> args, bool inBinding, bool inFn)
+    {
+      Dafny.ISequence<RAST._IType> s = Dafny.Sequence<RAST._IType>.Empty;
+      s = Dafny.Sequence<RAST._IType>.FromElements();
+      if ((new BigInteger((args).Count)).Sign == 1) {
+        BigInteger _2019_i;
+        _2019_i = BigInteger.Zero;
+        while ((_2019_i) < (new BigInteger((args).Count))) {
+          RAST._IType _2020_genTp;
+          RAST._IType _out56;
+          _out56 = (this).GenType((args).Select(_2019_i), inBinding, inFn);
+          _2020_genTp = _out56;
+          s = Dafny.Sequence<RAST._IType>.Concat(s, Dafny.Sequence<RAST._IType>.FromElements(_2020_genTp));
+          _2019_i = (_2019_i) + (BigInteger.One);
+        }
+      }
+      return s;
+    }
+    public RAST._IType GenType(DAST._IType c, bool inBinding, bool inFn)
+    {
+      RAST._IType s = RAST.Type.Default();
+      DAST._IType _source61 = c;
+      if (_source61.is_Path) {
+        Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2021___mcc_h0 = _source61.dtor_Path_a0;
+        Dafny.ISequence<DAST._IType> _2022___mcc_h1 = _source61.dtor_typeArgs;
+        DAST._IResolvedType _2023___mcc_h2 = _source61.dtor_resolved;
+        DAST._IResolvedType _2024_resolved = _2023___mcc_h2;
+        Dafny.ISequence<DAST._IType> _2025_args = _2022___mcc_h1;
+        Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2026_p = _2021___mcc_h0;
+        {
+          Dafny.ISequence<Dafny.Rune> _2027_t;
+          Dafny.ISequence<Dafny.Rune> _out57;
+          _out57 = DCOMP.COMP.GenPath(_2026_p);
+          _2027_t = _out57;
+          s = RAST.Type.create_TIdentifier(_2027_t);
+          Dafny.ISequence<RAST._IType> _2028_typeArgs;
+          Dafny.ISequence<RAST._IType> _out58;
+          _out58 = (this).GenTypeArgs(_2025_args, inBinding, inFn);
+          _2028_typeArgs = _out58;
+          s = RAST.Type.create_TypeApp(s, _2028_typeArgs);
+          DAST._IResolvedType _source62 = _2024_resolved;
+          if (_source62.is_Datatype) {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2029___mcc_h21 = _source62.dtor_path;
+            {
+              s = RAST.__default.Rc(s);
+            }
+          } else if (_source62.is_Trait) {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2030___mcc_h22 = _source62.dtor_path;
+            {
+              if ((_2026_p).Equals(Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_System"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("object")))) {
+                s = RAST.__default.RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc<dyn ::std::any::Any>"));
+              } else {
+                if (inBinding) {
+                  s = RAST.__default.RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_"));
+                } else {
+                  s = RAST.Type.create_ImplType(s);
+                }
+              }
+            }
+          } else {
+            DAST._IType _2031___mcc_h23 = _source62.dtor_baseType;
+            DAST._INewtypeRange _2032___mcc_h24 = _source62.dtor_range;
+            bool _2033___mcc_h25 = _source62.dtor_erase;
+            bool _2034_erased = _2033___mcc_h25;
+            DAST._INewtypeRange _2035_range = _2032___mcc_h24;
+            DAST._IType _2036_t = _2031___mcc_h23;
+            {
+              if (_2034_erased) {
+                Std.Wrappers._IOption<RAST._IType> _source63 = DCOMP.COMP.NewtypeToRustType(_2036_t, _2035_range);
+                if (_source63.is_None) {
+                } else {
+                  RAST._IType _2037___mcc_h26 = _source63.dtor_value;
+                  RAST._IType _2038_v = _2037___mcc_h26;
+                  s = _2038_v;
+                }
+              }
+            }
+          }
+        }
+      } else if (_source61.is_Nullable) {
+        DAST._IType _2039___mcc_h3 = _source61.dtor_Nullable_a0;
+        DAST._IType _2040_inner = _2039___mcc_h3;
+        {
+          RAST._IType _2041_innerExpr;
+          RAST._IType _out59;
+          _out59 = (this).GenType(_2040_inner, inBinding, inFn);
+          _2041_innerExpr = _out59;
+          s = RAST.Type.create_TypeApp(RAST.Type.create_TIdentifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::option::Option")), Dafny.Sequence<RAST._IType>.FromElements(_2041_innerExpr));
+        }
+      } else if (_source61.is_Tuple) {
+        Dafny.ISequence<DAST._IType> _2042___mcc_h4 = _source61.dtor_Tuple_a0;
+        Dafny.ISequence<DAST._IType> _2043_types = _2042___mcc_h4;
+        {
+          Dafny.ISequence<RAST._IType> _2044_args;
+          _2044_args = Dafny.Sequence<RAST._IType>.FromElements();
+          BigInteger _2045_i;
+          _2045_i = BigInteger.Zero;
+          while ((_2045_i) < (new BigInteger((_2043_types).Count))) {
+            RAST._IType _2046_generated;
+            RAST._IType _out60;
+            _out60 = (this).GenType((_2043_types).Select(_2045_i), inBinding, inFn);
+            _2046_generated = _out60;
+            _2044_args = Dafny.Sequence<RAST._IType>.Concat(_2044_args, Dafny.Sequence<RAST._IType>.FromElements(_2046_generated));
+            _2045_i = (_2045_i) + (BigInteger.One);
+          }
+          s = RAST.Type.create_TupleType(_2044_args);
+        }
+      } else if (_source61.is_Array) {
+        DAST._IType _2047___mcc_h5 = _source61.dtor_element;
+        BigInteger _2048___mcc_h6 = _source61.dtor_dims;
+        BigInteger _2049_dims = _2048___mcc_h6;
+        DAST._IType _2050_element = _2047___mcc_h5;
+        {
+          RAST._IType _2051_elem;
+          RAST._IType _out61;
+          _out61 = (this).GenType(_2050_element, inBinding, inFn);
+          _2051_elem = _out61;
+          s = _2051_elem;
+          BigInteger _2052_i;
+          _2052_i = BigInteger.Zero;
+          while ((_2052_i) < (_2049_dims)) {
+            s = RAST.__default.Rc(RAST.__default.RefCell(RAST.__default.Vec(s)));
+            _2052_i = (_2052_i) + (BigInteger.One);
+          }
+        }
+      } else if (_source61.is_Seq) {
+        DAST._IType _2053___mcc_h7 = _source61.dtor_element;
+        DAST._IType _2054_element = _2053___mcc_h7;
+        {
+          RAST._IType _2055_elem;
+          RAST._IType _out62;
+          _out62 = (this).GenType(_2054_element, inBinding, inFn);
+          _2055_elem = _out62;
+          s = RAST.Type.create_TypeApp((RAST.__default.dafny__runtime__type).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Sequence")), Dafny.Sequence<RAST._IType>.FromElements(_2055_elem));
+        }
+      } else if (_source61.is_Set) {
+        DAST._IType _2056___mcc_h8 = _source61.dtor_element;
+        DAST._IType _2057_element = _2056___mcc_h8;
+        {
+          RAST._IType _2058_elem;
+          RAST._IType _out63;
+          _out63 = (this).GenType(_2057_element, inBinding, inFn);
+          _2058_elem = _out63;
+          s = RAST.Type.create_TypeApp((RAST.__default.dafny__runtime__type).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Set")), Dafny.Sequence<RAST._IType>.FromElements(_2058_elem));
+        }
+      } else if (_source61.is_Multiset) {
+        DAST._IType _2059___mcc_h9 = _source61.dtor_element;
+        DAST._IType _2060_element = _2059___mcc_h9;
+        {
+          RAST._IType _2061_elem;
+          RAST._IType _out64;
+          _out64 = (this).GenType(_2060_element, inBinding, inFn);
+          _2061_elem = _out64;
+          s = RAST.Type.create_TypeApp((RAST.__default.dafny__runtime__type).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Multiset")), Dafny.Sequence<RAST._IType>.FromElements(_2061_elem));
+        }
+      } else if (_source61.is_Map) {
+        DAST._IType _2062___mcc_h10 = _source61.dtor_key;
+        DAST._IType _2063___mcc_h11 = _source61.dtor_value;
+        DAST._IType _2064_value = _2063___mcc_h11;
+        DAST._IType _2065_key = _2062___mcc_h10;
+        {
+          RAST._IType _2066_keyType;
+          RAST._IType _out65;
+          _out65 = (this).GenType(_2065_key, inBinding, inFn);
+          _2066_keyType = _out65;
+          RAST._IType _2067_valueType;
+          RAST._IType _out66;
+          _out66 = (this).GenType(_2064_value, inBinding, inFn);
+          _2067_valueType = _out66;
+          s = RAST.Type.create_TypeApp((RAST.__default.dafny__runtime__type).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Map")), Dafny.Sequence<RAST._IType>.FromElements(_2066_keyType, _2067_valueType));
+        }
+      } else if (_source61.is_SetBuilder) {
+        DAST._IType _2068___mcc_h12 = _source61.dtor_element;
+        DAST._IType _2069_elem = _2068___mcc_h12;
+        {
+          RAST._IType _2070_elemType;
+          RAST._IType _out67;
+          _out67 = (this).GenType(_2069_elem, inBinding, inFn);
+          _2070_elemType = _out67;
+          s = RAST.Type.create_TypeApp((RAST.__default.dafny__runtime__type).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("SetBuilder")), Dafny.Sequence<RAST._IType>.FromElements(_2070_elemType));
+        }
+      } else if (_source61.is_MapBuilder) {
+        DAST._IType _2071___mcc_h13 = _source61.dtor_key;
+        DAST._IType _2072___mcc_h14 = _source61.dtor_value;
+        DAST._IType _2073_value = _2072___mcc_h14;
+        DAST._IType _2074_key = _2071___mcc_h13;
+        {
+          RAST._IType _2075_keyType;
+          RAST._IType _out68;
+          _out68 = (this).GenType(_2074_key, inBinding, inFn);
+          _2075_keyType = _out68;
+          RAST._IType _2076_valueType;
+          RAST._IType _out69;
+          _out69 = (this).GenType(_2073_value, inBinding, inFn);
+          _2076_valueType = _out69;
+          s = RAST.Type.create_TypeApp((RAST.__default.dafny__runtime__type).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("MapBuilder")), Dafny.Sequence<RAST._IType>.FromElements(_2075_keyType, _2076_valueType));
+        }
+      } else if (_source61.is_Arrow) {
+        Dafny.ISequence<DAST._IType> _2077___mcc_h15 = _source61.dtor_args;
+        DAST._IType _2078___mcc_h16 = _source61.dtor_result;
+        DAST._IType _2079_result = _2078___mcc_h16;
+        Dafny.ISequence<DAST._IType> _2080_args = _2077___mcc_h15;
+        {
+          Dafny.ISequence<RAST._IType> _2081_argTypes;
+          _2081_argTypes = Dafny.Sequence<RAST._IType>.FromElements();
+          BigInteger _2082_i;
+          _2082_i = BigInteger.Zero;
+          while ((_2082_i) < (new BigInteger((_2080_args).Count))) {
+            RAST._IType _2083_generated;
+            RAST._IType _out70;
+            _out70 = (this).GenType((_2080_args).Select(_2082_i), inBinding, true);
+            _2083_generated = _out70;
+            _2081_argTypes = Dafny.Sequence<RAST._IType>.Concat(_2081_argTypes, Dafny.Sequence<RAST._IType>.FromElements(RAST.Type.create_Borrowed(_2083_generated)));
+            _2082_i = (_2082_i) + (BigInteger.One);
+          }
+          RAST._IType _2084_resultType;
+          RAST._IType _out71;
+          _out71 = (this).GenType(_2079_result, inBinding, (inFn) || (inBinding));
+          _2084_resultType = _out71;
+          s = RAST.Type.create_TypeApp((RAST.__default.dafny__runtime__type).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("FunctionWrapper")), Dafny.Sequence<RAST._IType>.FromElements(RAST.Type.create_FnType(_2081_argTypes, RAST.Type.create_IntersectionType(_2084_resultType, RAST.__default.StaticTrait))));
+        }
+      } else if (_source61.is_Primitive) {
+        DAST._IPrimitive _2085___mcc_h17 = _source61.dtor_Primitive_a0;
+        DAST._IPrimitive _2086_p = _2085___mcc_h17;
+        {
+          DAST._IPrimitive _source64 = _2086_p;
+          if (_source64.is_Int) {
+            s = (RAST.__default.dafny__runtime__type).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("DafnyInt"));
+          } else if (_source64.is_Real) {
+            s = (RAST.__default.dafny__runtime__type).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("BigRational"));
+          } else if (_source64.is_String) {
+            s = RAST.Type.create_TypeApp((RAST.__default.dafny__runtime__type).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Sequence")), Dafny.Sequence<RAST._IType>.FromElements((RAST.__default.dafny__runtime__type).MSel((this).DafnyChar)));
+          } else if (_source64.is_Bool) {
+            s = RAST.__default.RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("bool"));
+          } else {
+            s = (RAST.__default.dafny__runtime__type).MSel((this).DafnyChar);
+          }
+        }
+      } else if (_source61.is_Passthrough) {
+        Dafny.ISequence<Dafny.Rune> _2087___mcc_h18 = _source61.dtor_Passthrough_a0;
+        Dafny.ISequence<Dafny.Rune> _2088_v = _2087___mcc_h18;
+        s = RAST.__default.RawType(_2088_v);
+      } else {
+        Dafny.ISequence<Dafny.Rune> _2089___mcc_h19 = _source61.dtor_TypeArg_a0;
+        Dafny.ISequence<Dafny.Rune> _source65 = _2089___mcc_h19;
+        Dafny.ISequence<Dafny.Rune> _2090___mcc_h20 = _source65;
+        Dafny.ISequence<Dafny.Rune> _2091_name = _2090___mcc_h20;
+        s = RAST.__default.RawType(DCOMP.__default.escapeIdent(_2091_name));
+      }
+      return s;
+    }
+    public void GenClassImplBody(Dafny.ISequence<DAST._IMethod> body, bool forTrait, DAST._IType enclosingType, Dafny.ISet<DAST._IType> enclosingTypeParams, out Dafny.ISequence<RAST._IImplMember> s, out Dafny.IMap<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>,Dafny.ISequence<RAST._IImplMember>> traitBodies)
+    {
+      s = Dafny.Sequence<RAST._IImplMember>.Empty;
+      traitBodies = Dafny.Map<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>, Dafny.ISequence<RAST._IImplMember>>.Empty;
+      s = Dafny.Sequence<RAST._IImplMember>.FromElements();
+      traitBodies = Dafny.Map<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>, Dafny.ISequence<RAST._IImplMember>>.FromElements();
+      BigInteger _2092_i;
+      _2092_i = BigInteger.Zero;
+      while ((_2092_i) < (new BigInteger((body).Count))) {
+        DAST._IMethod _source66 = (body).Select(_2092_i);
+        DAST._IMethod _2093___mcc_h0 = _source66;
+        DAST._IMethod _2094_m = _2093___mcc_h0;
+        {
+          Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> _source67 = (_2094_m).dtor_overridingPath;
+          if (_source67.is_None) {
+            {
+              RAST._IImplMember _2095_generated;
+              RAST._IImplMember _out72;
+              _out72 = (this).GenMethod(_2094_m, forTrait, enclosingType, enclosingTypeParams);
+              _2095_generated = _out72;
+              s = Dafny.Sequence<RAST._IImplMember>.Concat(s, Dafny.Sequence<RAST._IImplMember>.FromElements(_2095_generated));
+            }
+          } else {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2096___mcc_h1 = _source67.dtor_value;
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2097_p = _2096___mcc_h1;
+            {
+              Dafny.ISequence<RAST._IImplMember> _2098_existing;
+              _2098_existing = Dafny.Sequence<RAST._IImplMember>.FromElements();
+              if ((traitBodies).Contains(_2097_p)) {
+                _2098_existing = Dafny.Map<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>, Dafny.ISequence<RAST._IImplMember>>.Select(traitBodies,_2097_p);
+              }
+              RAST._IImplMember _2099_genMethod;
+              RAST._IImplMember _out73;
+              _out73 = (this).GenMethod(_2094_m, true, enclosingType, enclosingTypeParams);
+              _2099_genMethod = _out73;
+              _2098_existing = Dafny.Sequence<RAST._IImplMember>.Concat(_2098_existing, Dafny.Sequence<RAST._IImplMember>.FromElements(_2099_genMethod));
+              traitBodies = Dafny.Map<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>, Dafny.ISequence<RAST._IImplMember>>.Merge(traitBodies, Dafny.Map<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>, Dafny.ISequence<RAST._IImplMember>>.FromElements(new Dafny.Pair<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>, Dafny.ISequence<RAST._IImplMember>>(_2097_p, _2098_existing)));
+            }
+          }
+        }
+        _2092_i = (_2092_i) + (BigInteger.One);
+      }
+    }
+    public Dafny.ISequence<RAST._IFormal> GenParams(Dafny.ISequence<DAST._IFormal> @params)
+    {
+      Dafny.ISequence<RAST._IFormal> s = Dafny.Sequence<RAST._IFormal>.Empty;
+      s = Dafny.Sequence<RAST._IFormal>.FromElements();
+      BigInteger _2100_i;
+      _2100_i = BigInteger.Zero;
+      while ((_2100_i) < (new BigInteger((@params).Count))) {
+        DAST._IFormal _2101_param;
+        _2101_param = (@params).Select(_2100_i);
+        RAST._IType _2102_paramType;
+        RAST._IType _out74;
+        _out74 = (this).GenType((_2101_param).dtor_typ, false, false);
+        _2102_paramType = _out74;
+        s = Dafny.Sequence<RAST._IFormal>.Concat(s, Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.create(DCOMP.__default.escapeIdent((_2101_param).dtor_name), RAST.Type.create_Borrowed(_2102_paramType))));
+        _2100_i = (_2100_i) + (BigInteger.One);
+      }
+      return s;
+    }
+    public RAST._IImplMember GenMethod(DAST._IMethod m, bool forTrait, DAST._IType enclosingType, Dafny.ISet<DAST._IType> enclosingTypeParams)
+    {
+      RAST._IImplMember s = RAST.ImplMember.Default();
+      Dafny.ISequence<RAST._IFormal> _2103_params;
+      Dafny.ISequence<RAST._IFormal> _out75;
+      _out75 = (this).GenParams((m).dtor_params);
+      _2103_params = _out75;
+      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2104_paramNames;
+      _2104_paramNames = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements();
+      BigInteger _2105_paramI;
+      _2105_paramI = BigInteger.Zero;
+      while ((_2105_paramI) < (new BigInteger(((m).dtor_params).Count))) {
+        _2104_paramNames = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Concat(_2104_paramNames, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements((((m).dtor_params).Select(_2105_paramI)).dtor_name));
+        _2105_paramI = (_2105_paramI) + (BigInteger.One);
+      }
+      if (!((m).dtor_isStatic)) {
+        if (forTrait) {
+          _2103_params = Dafny.Sequence<RAST._IFormal>.Concat(Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.self), _2103_params);
+        } else {
+          RAST._IType _2106_tpe;
+          RAST._IType _out76;
+          _out76 = (this).GenType(enclosingType, false, false);
+          _2106_tpe = _out76;
+          _2103_params = Dafny.Sequence<RAST._IFormal>.Concat(Dafny.Sequence<RAST._IFormal>.FromElements(RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("self"), RAST.Type.create_Borrowed(_2106_tpe))), _2103_params);
+        }
+      }
+      Dafny.ISequence<RAST._IType> _2107_retTypeArgs;
+      _2107_retTypeArgs = Dafny.Sequence<RAST._IType>.FromElements();
+      BigInteger _2108_typeI;
+      _2108_typeI = BigInteger.Zero;
+      while ((_2108_typeI) < (new BigInteger(((m).dtor_outTypes).Count))) {
+        RAST._IType _2109_typeExpr;
+        RAST._IType _out77;
+        _out77 = (this).GenType(((m).dtor_outTypes).Select(_2108_typeI), false, false);
+        _2109_typeExpr = _out77;
+        _2107_retTypeArgs = Dafny.Sequence<RAST._IType>.Concat(_2107_retTypeArgs, Dafny.Sequence<RAST._IType>.FromElements(_2109_typeExpr));
+        _2108_typeI = (_2108_typeI) + (BigInteger.One);
+      }
+      RAST._IVisibility _2110_visibility;
+      _2110_visibility = RAST.Visibility.create_PUB();
+      Dafny.ISequence<Dafny.Rune> _2111_fnName;
+      _2111_fnName = DCOMP.__default.escapeIdent((m).dtor_name);
+      Dafny.ISequence<DAST._IType> _2112_typeParamsFiltered;
+      _2112_typeParamsFiltered = Dafny.Sequence<DAST._IType>.FromElements();
+      BigInteger _2113_typeParamI;
+      _2113_typeParamI = BigInteger.Zero;
+      while ((_2113_typeParamI) < (new BigInteger(((m).dtor_typeParams).Count))) {
+        DAST._IType _2114_typeParam;
+        _2114_typeParam = ((m).dtor_typeParams).Select(_2113_typeParamI);
+        if (!((enclosingTypeParams).Contains(_2114_typeParam))) {
+          _2112_typeParamsFiltered = Dafny.Sequence<DAST._IType>.Concat(_2112_typeParamsFiltered, Dafny.Sequence<DAST._IType>.FromElements(_2114_typeParam));
+        }
+        _2113_typeParamI = (_2113_typeParamI) + (BigInteger.One);
+      }
+      Dafny.ISequence<Dafny.Rune> _2115_whereClauses;
+      _2115_whereClauses = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
+      Dafny.ISequence<RAST._ITypeParam> _2116_typeParams;
+      _2116_typeParams = Dafny.Sequence<RAST._ITypeParam>.FromElements();
+      if ((new BigInteger((_2112_typeParamsFiltered).Count)).Sign == 1) {
+        _2115_whereClauses = Dafny.Sequence<Dafny.Rune>.Concat(_2115_whereClauses, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" where "));
+        BigInteger _2117_i;
+        _2117_i = BigInteger.Zero;
+        while ((_2117_i) < (new BigInteger((_2112_typeParamsFiltered).Count))) {
+          RAST._IType _2118_typeExpr;
+          RAST._IType _out78;
+          _out78 = (this).GenType((_2112_typeParamsFiltered).Select(_2117_i), false, false);
+          _2118_typeExpr = _out78;
+          _2116_typeParams = Dafny.Sequence<RAST._ITypeParam>.Concat(_2116_typeParams, Dafny.Sequence<RAST._ITypeParam>.FromElements(RAST.TypeParam.create((_2118_typeExpr)._ToString(DCOMP.__default.IND), Dafny.Sequence<RAST._IType>.FromElements(RAST.__default.CloneTrait, RAST.__default.DafnyPrintTrait, RAST.__default.DefaultTrait, RAST.__default.StaticTrait))));
+          _2117_i = (_2117_i) + (BigInteger.One);
+        }
+      }
+      Std.Wrappers._IOption<RAST._IExpr> _2119_fBody = Std.Wrappers.Option<RAST._IExpr>.Default();
+      if ((m).dtor_hasBody) {
+        RAST._IExpr _2120_earlyReturn;
+        _2120_earlyReturn = RAST.Expr.create_Return(Std.Wrappers.Option<RAST._IExpr>.create_None());
+        Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> _source68 = (m).dtor_outVars;
+        if (_source68.is_None) {
+        } else {
+          Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2121___mcc_h0 = _source68.dtor_value;
+          Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2122_outVars = _2121___mcc_h0;
+          {
+            Dafny.ISequence<RAST._IExpr> _2123_tupleArgs;
+            _2123_tupleArgs = Dafny.Sequence<RAST._IExpr>.FromElements();
+            BigInteger _2124_outI;
+            _2124_outI = BigInteger.Zero;
+            while ((_2124_outI) < (new BigInteger((_2122_outVars).Count))) {
+              Dafny.ISequence<Dafny.Rune> _2125_outVar;
+              _2125_outVar = (_2122_outVars).Select(_2124_outI);
+              _2123_tupleArgs = Dafny.Sequence<RAST._IExpr>.Concat(_2123_tupleArgs, Dafny.Sequence<RAST._IExpr>.FromElements(RAST.Expr.create_Identifier(DCOMP.__default.escapeIdent((_2125_outVar)))));
+              _2124_outI = (_2124_outI) + (BigInteger.One);
+            }
+            _2120_earlyReturn = RAST.Expr.create_Return(Std.Wrappers.Option<RAST._IExpr>.create_Some(RAST.Expr.create_Tuple(_2123_tupleArgs)));
+          }
+        }
+        RAST._IExpr _2126_body;
+        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2127___v39;
+        RAST._IExpr _out79;
+        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out80;
+        (this).GenStmts((m).dtor_body, (((m).dtor_isStatic) ? (Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None()) : (Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_Some(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("self")))), _2104_paramNames, true, _2120_earlyReturn, out _out79, out _out80);
+        _2126_body = _out79;
+        _2127___v39 = _out80;
+        _2119_fBody = Std.Wrappers.Option<RAST._IExpr>.create_Some(_2126_body);
+      } else {
+        _2119_fBody = Std.Wrappers.Option<RAST._IExpr>.create_None();
+      }
+      s = RAST.ImplMember.create_FnDecl(_2110_visibility, RAST.Fn.create(_2111_fnName, _2116_typeParams, _2103_params, Std.Wrappers.Option<RAST._IType>.create_Some((((new BigInteger((_2107_retTypeArgs).Count)) == (BigInteger.One)) ? ((_2107_retTypeArgs).Select(BigInteger.Zero)) : (RAST.Type.create_TupleType(_2107_retTypeArgs)))), _2115_whereClauses, _2119_fBody));
+      return s;
+    }
+    public void GenStmts(Dafny.ISequence<DAST._IStatement> stmts, Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> selfIdent, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> @params, bool isLast, RAST._IExpr earlyReturn, out RAST._IExpr generated, out Dafny.ISet<Dafny.ISequence<Dafny.Rune>> readIdents)
+    {
+      generated = RAST.Expr.Default();
+      readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Empty;
+      generated = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""));
+      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2128_declarations;
+      _2128_declarations = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+      readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+      BigInteger _2129_i;
+      _2129_i = BigInteger.Zero;
+      while ((_2129_i) < (new BigInteger((stmts).Count))) {
+        DAST._IStatement _2130_stmt;
+        _2130_stmt = (stmts).Select(_2129_i);
+        RAST._IExpr _2131_stmtExpr;
+        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2132_recIdents;
+        RAST._IExpr _out81;
+        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out82;
+        (this).GenStmt(_2130_stmt, selfIdent, @params, (isLast) && ((_2129_i) == ((new BigInteger((stmts).Count)) - (BigInteger.One))), earlyReturn, out _out81, out _out82);
+        _2131_stmtExpr = _out81;
+        _2132_recIdents = _out82;
+        readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Difference(_2132_recIdents, _2128_declarations));
+        DAST._IStatement _source69 = _2130_stmt;
+        if (_source69.is_DeclareVar) {
+          Dafny.ISequence<Dafny.Rune> _2133___mcc_h0 = _source69.dtor_name;
+          DAST._IType _2134___mcc_h1 = _source69.dtor_typ;
+          Std.Wrappers._IOption<DAST._IExpression> _2135___mcc_h2 = _source69.dtor_maybeValue;
+          Dafny.ISequence<Dafny.Rune> _2136_name = _2133___mcc_h0;
+          {
+            _2128_declarations = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(_2128_declarations, Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements(_2136_name));
+          }
+        } else if (_source69.is_Assign) {
+          DAST._IAssignLhs _2137___mcc_h6 = _source69.dtor_lhs;
+          DAST._IExpression _2138___mcc_h7 = _source69.dtor_value;
+        } else if (_source69.is_If) {
+          DAST._IExpression _2139___mcc_h10 = _source69.dtor_cond;
+          Dafny.ISequence<DAST._IStatement> _2140___mcc_h11 = _source69.dtor_thn;
+          Dafny.ISequence<DAST._IStatement> _2141___mcc_h12 = _source69.dtor_els;
+        } else if (_source69.is_Labeled) {
+          Dafny.ISequence<Dafny.Rune> _2142___mcc_h16 = _source69.dtor_lbl;
+          Dafny.ISequence<DAST._IStatement> _2143___mcc_h17 = _source69.dtor_body;
+        } else if (_source69.is_While) {
+          DAST._IExpression _2144___mcc_h20 = _source69.dtor_cond;
+          Dafny.ISequence<DAST._IStatement> _2145___mcc_h21 = _source69.dtor_body;
+        } else if (_source69.is_Foreach) {
+          Dafny.ISequence<Dafny.Rune> _2146___mcc_h24 = _source69.dtor_boundName;
+          DAST._IType _2147___mcc_h25 = _source69.dtor_boundType;
+          DAST._IExpression _2148___mcc_h26 = _source69.dtor_over;
+          Dafny.ISequence<DAST._IStatement> _2149___mcc_h27 = _source69.dtor_body;
+        } else if (_source69.is_Call) {
+          DAST._IExpression _2150___mcc_h32 = _source69.dtor_on;
+          DAST._ICallName _2151___mcc_h33 = _source69.dtor_callName;
+          Dafny.ISequence<DAST._IType> _2152___mcc_h34 = _source69.dtor_typeArgs;
+          Dafny.ISequence<DAST._IExpression> _2153___mcc_h35 = _source69.dtor_args;
+          Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> _2154___mcc_h36 = _source69.dtor_outs;
+        } else if (_source69.is_Return) {
+          DAST._IExpression _2155___mcc_h42 = _source69.dtor_expr;
+        } else if (_source69.is_EarlyReturn) {
+        } else if (_source69.is_Break) {
+          Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _2156___mcc_h44 = _source69.dtor_toLabel;
+        } else if (_source69.is_TailRecursive) {
+          Dafny.ISequence<DAST._IStatement> _2157___mcc_h46 = _source69.dtor_body;
+        } else if (_source69.is_JumpTailCallStart) {
+        } else if (_source69.is_Halt) {
+        } else {
+          DAST._IExpression _2158___mcc_h48 = _source69.dtor_Print_a0;
+        }
+        generated = (generated).Then(_2131_stmtExpr);
+        _2129_i = (_2129_i) + (BigInteger.One);
+      }
+    }
+    public void GenAssignLhs(DAST._IAssignLhs lhs, Dafny.ISequence<Dafny.Rune> rhs, Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> selfIdent, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> @params, out Dafny.ISequence<Dafny.Rune> generated, out bool needsIIFE, out Dafny.ISet<Dafny.ISequence<Dafny.Rune>> readIdents)
+    {
+      generated = Dafny.Sequence<Dafny.Rune>.Empty;
+      needsIIFE = false;
+      readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Empty;
+      DAST._IAssignLhs _source70 = lhs;
+      if (_source70.is_Ident) {
+        Dafny.ISequence<Dafny.Rune> _2159___mcc_h0 = _source70.dtor_Ident_a0;
+        Dafny.ISequence<Dafny.Rune> _source71 = _2159___mcc_h0;
+        Dafny.ISequence<Dafny.Rune> _2160___mcc_h1 = _source71;
+        Dafny.ISequence<Dafny.Rune> _2161_id = _2160___mcc_h1;
+        {
+          if ((@params).Contains(_2161_id)) {
+            generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("*"), DCOMP.__default.escapeIdent(_2161_id));
+          } else {
+            generated = DCOMP.__default.escapeIdent(_2161_id);
+          }
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements(_2161_id);
+          needsIIFE = false;
+        }
+      } else if (_source70.is_Select) {
+        DAST._IExpression _2162___mcc_h2 = _source70.dtor_expr;
+        Dafny.ISequence<Dafny.Rune> _2163___mcc_h3 = _source70.dtor_field;
+        Dafny.ISequence<Dafny.Rune> _2164_field = _2163___mcc_h3;
+        DAST._IExpression _2165_on = _2162___mcc_h2;
+        {
+          RAST._IExpr _2166_onExpr;
+          DCOMP._IOwnership _2167_onOwned;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2168_recIdents;
+          RAST._IExpr _out83;
+          DCOMP._IOwnership _out84;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out85;
+          (this).GenExpr(_2165_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out83, out _out84, out _out85);
+          _2166_onExpr = _out83;
+          _2167_onOwned = _out84;
+          _2168_recIdents = _out85;
+          generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("*("), (_2166_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), _2164_field), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow_mut()) = ")), rhs), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";"));
+          readIdents = _2168_recIdents;
+          needsIIFE = true;
+        }
+      } else {
+        DAST._IExpression _2169___mcc_h4 = _source70.dtor_expr;
+        Dafny.ISequence<DAST._IExpression> _2170___mcc_h5 = _source70.dtor_indices;
+        Dafny.ISequence<DAST._IExpression> _2171_indices = _2170___mcc_h5;
+        DAST._IExpression _2172_on = _2169___mcc_h4;
+        {
+          RAST._IExpr _2173_onExpr;
+          DCOMP._IOwnership _2174_onOwned;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2175_recIdents;
+          RAST._IExpr _out86;
+          DCOMP._IOwnership _out87;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out88;
+          (this).GenExpr(_2172_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out86, out _out87, out _out88);
+          _2173_onExpr = _out86;
+          _2174_onOwned = _out87;
+          _2175_recIdents = _out88;
+          readIdents = _2175_recIdents;
+          generated = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("{\n");
+          BigInteger _2176_i;
+          _2176_i = BigInteger.Zero;
+          while ((_2176_i) < (new BigInteger((_2171_indices).Count))) {
+            RAST._IExpr _2177_idx;
+            DCOMP._IOwnership _2178___v43;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2179_recIdentsIdx;
+            RAST._IExpr _out89;
+            DCOMP._IOwnership _out90;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out91;
+            (this).GenExpr((_2171_indices).Select(_2176_i), selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out89, out _out90, out _out91);
+            _2177_idx = _out89;
+            _2178___v43 = _out90;
+            _2179_recIdentsIdx = _out91;
+            generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(generated, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("let __idx")), Std.Strings.__default.OfNat(_2176_i)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" = <usize as ::dafny_runtime::NumCast>::from(")), (_2177_idx)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").unwrap();\n"));
+            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _2179_recIdentsIdx);
+            _2176_i = (_2176_i) + (BigInteger.One);
+          }
+          generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(generated, (_2173_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow_mut()"));
+          _2176_i = BigInteger.Zero;
+          while ((_2176_i) < (new BigInteger((_2171_indices).Count))) {
+            generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(generated, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("[__idx")), Std.Strings.__default.OfNat(_2176_i)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("]"));
+            _2176_i = (_2176_i) + (BigInteger.One);
+          }
+          generated = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(generated, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" = ")), rhs), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";\n}"));
+          needsIIFE = true;
+        }
+      }
+    }
+    public void GenStmt(DAST._IStatement stmt, Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> selfIdent, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> @params, bool isLast, RAST._IExpr earlyReturn, out RAST._IExpr generated, out Dafny.ISet<Dafny.ISequence<Dafny.Rune>> readIdents)
+    {
+      generated = RAST.Expr.Default();
+      readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Empty;
+      DAST._IStatement _source72 = stmt;
+      if (_source72.is_DeclareVar) {
+        Dafny.ISequence<Dafny.Rune> _2180___mcc_h0 = _source72.dtor_name;
+        DAST._IType _2181___mcc_h1 = _source72.dtor_typ;
+        Std.Wrappers._IOption<DAST._IExpression> _2182___mcc_h2 = _source72.dtor_maybeValue;
+        Std.Wrappers._IOption<DAST._IExpression> _source73 = _2182___mcc_h2;
+        if (_source73.is_None) {
+          DAST._IType _2183_typ = _2181___mcc_h1;
+          Dafny.ISequence<Dafny.Rune> _2184_name = _2180___mcc_h0;
+          {
+            RAST._IType _2185_typeString;
+            RAST._IType _out92;
+            _out92 = (this).GenType(_2183_typ, true, false);
+            _2185_typeString = _out92;
+            generated = RAST.Expr.create_DeclareVar(RAST.DeclareType.create_MUT(), DCOMP.__default.escapeIdent(_2184_name), Std.Wrappers.Option<RAST._IType>.create_Some(_2185_typeString), Std.Wrappers.Option<RAST._IExpr>.create_None());
+            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          }
+        } else {
+          DAST._IExpression _2186___mcc_h3 = _source73.dtor_value;
+          DAST._IExpression _2187_expression = _2186___mcc_h3;
+          DAST._IType _2188_typ = _2181___mcc_h1;
+          Dafny.ISequence<Dafny.Rune> _2189_name = _2180___mcc_h0;
+          {
+            RAST._IType _2190_typeString;
+            RAST._IType _out93;
+            _out93 = (this).GenType(_2188_typ, true, false);
+            _2190_typeString = _out93;
+            RAST._IExpr _2191_expr;
+            DCOMP._IOwnership _2192___v44;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2193_recIdents;
+            RAST._IExpr _out94;
+            DCOMP._IOwnership _out95;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out96;
+            (this).GenExpr(_2187_expression, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out94, out _out95, out _out96);
+            _2191_expr = _out94;
+            _2192___v44 = _out95;
+            _2193_recIdents = _out96;
+            generated = RAST.Expr.create_DeclareVar(RAST.DeclareType.create_MUT(), DCOMP.__default.escapeIdent(_2189_name), Std.Wrappers.Option<RAST._IType>.create_Some(_2190_typeString), Std.Wrappers.Option<RAST._IExpr>.create_Some(_2191_expr));
+            readIdents = _2193_recIdents;
+          }
+        }
+      } else if (_source72.is_Assign) {
+        DAST._IAssignLhs _2194___mcc_h4 = _source72.dtor_lhs;
+        DAST._IExpression _2195___mcc_h5 = _source72.dtor_value;
+        DAST._IExpression _2196_expression = _2195___mcc_h5;
+        DAST._IAssignLhs _2197_lhs = _2194___mcc_h4;
+        {
+          Dafny.ISequence<Dafny.Rune> _2198_lhsGen;
+          bool _2199_needsIIFE;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2200_recIdents;
+          Dafny.ISequence<Dafny.Rune> _out97;
+          bool _out98;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out99;
+          (this).GenAssignLhs(_2197_lhs, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("__rhs"), selfIdent, @params, out _out97, out _out98, out _out99);
+          _2198_lhsGen = _out97;
+          _2199_needsIIFE = _out98;
+          _2200_recIdents = _out99;
+          RAST._IExpr _2201_exprGen;
+          DCOMP._IOwnership _2202___v45;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2203_exprIdents;
+          RAST._IExpr _out100;
+          DCOMP._IOwnership _out101;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out102;
+          (this).GenExpr(_2196_expression, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out100, out _out101, out _out102);
+          _2201_exprGen = _out100;
+          _2202___v45 = _out101;
+          _2203_exprIdents = _out102;
+          if (_2199_needsIIFE) {
+            generated = RAST.Expr.create_Block(RAST.Expr.create_StmtExpr(RAST.Expr.create_DeclareVar(RAST.DeclareType.create_CONST(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("__rhs"), Std.Wrappers.Option<RAST._IType>.create_None(), Std.Wrappers.Option<RAST._IExpr>.create_Some(_2201_exprGen)), RAST.Expr.create_RawExpr(_2198_lhsGen)));
+          } else {
+            generated = RAST.Expr.create_AssignVar(_2198_lhsGen, _2201_exprGen);
+          }
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(_2200_recIdents, _2203_exprIdents);
+        }
+      } else if (_source72.is_If) {
+        DAST._IExpression _2204___mcc_h6 = _source72.dtor_cond;
+        Dafny.ISequence<DAST._IStatement> _2205___mcc_h7 = _source72.dtor_thn;
+        Dafny.ISequence<DAST._IStatement> _2206___mcc_h8 = _source72.dtor_els;
+        Dafny.ISequence<DAST._IStatement> _2207_els = _2206___mcc_h8;
+        Dafny.ISequence<DAST._IStatement> _2208_thn = _2205___mcc_h7;
+        DAST._IExpression _2209_cond = _2204___mcc_h6;
+        {
+          RAST._IExpr _2210_cond;
+          DCOMP._IOwnership _2211___v46;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2212_recIdents;
+          RAST._IExpr _out103;
+          DCOMP._IOwnership _out104;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out105;
+          (this).GenExpr(_2209_cond, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out103, out _out104, out _out105);
+          _2210_cond = _out103;
+          _2211___v46 = _out104;
+          _2212_recIdents = _out105;
+          Dafny.ISequence<Dafny.Rune> _2213_condString;
+          _2213_condString = (_2210_cond)._ToString(DCOMP.__default.IND);
+          readIdents = _2212_recIdents;
+          RAST._IExpr _2214_thn;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2215_thnIdents;
+          RAST._IExpr _out106;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out107;
+          (this).GenStmts(_2208_thn, selfIdent, @params, isLast, earlyReturn, out _out106, out _out107);
+          _2214_thn = _out106;
+          _2215_thnIdents = _out107;
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _2215_thnIdents);
+          RAST._IExpr _2216_els;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2217_elsIdents;
+          RAST._IExpr _out108;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out109;
+          (this).GenStmts(_2207_els, selfIdent, @params, isLast, earlyReturn, out _out108, out _out109);
+          _2216_els = _out108;
+          _2217_elsIdents = _out109;
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _2217_elsIdents);
+          generated = RAST.Expr.create_IfExpr(_2210_cond, _2214_thn, _2216_els);
+        }
+      } else if (_source72.is_Labeled) {
+        Dafny.ISequence<Dafny.Rune> _2218___mcc_h9 = _source72.dtor_lbl;
+        Dafny.ISequence<DAST._IStatement> _2219___mcc_h10 = _source72.dtor_body;
+        Dafny.ISequence<DAST._IStatement> _2220_body = _2219___mcc_h10;
+        Dafny.ISequence<Dafny.Rune> _2221_lbl = _2218___mcc_h9;
+        {
+          RAST._IExpr _2222_body;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2223_bodyIdents;
+          RAST._IExpr _out110;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out111;
+          (this).GenStmts(_2220_body, selfIdent, @params, isLast, earlyReturn, out _out110, out _out111);
+          _2222_body = _out110;
+          _2223_bodyIdents = _out111;
+          readIdents = _2223_bodyIdents;
+          generated = RAST.Expr.create_Labelled(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("label_"), _2221_lbl), RAST.Expr.create_Loop(Std.Wrappers.Option<RAST._IExpr>.create_None(), RAST.Expr.create_StmtExpr(_2222_body, RAST.Expr.create_Break(Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None()))));
+        }
+      } else if (_source72.is_While) {
+        DAST._IExpression _2224___mcc_h11 = _source72.dtor_cond;
+        Dafny.ISequence<DAST._IStatement> _2225___mcc_h12 = _source72.dtor_body;
+        Dafny.ISequence<DAST._IStatement> _2226_body = _2225___mcc_h12;
+        DAST._IExpression _2227_cond = _2224___mcc_h11;
+        {
+          RAST._IExpr _2228_cond;
+          DCOMP._IOwnership _2229___v47;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2230_recIdents;
+          RAST._IExpr _out112;
+          DCOMP._IOwnership _out113;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out114;
+          (this).GenExpr(_2227_cond, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out112, out _out113, out _out114);
+          _2228_cond = _out112;
+          _2229___v47 = _out113;
+          _2230_recIdents = _out114;
+          readIdents = _2230_recIdents;
+          RAST._IExpr _2231_body;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2232_bodyIdents;
+          RAST._IExpr _out115;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out116;
+          (this).GenStmts(_2226_body, selfIdent, @params, false, earlyReturn, out _out115, out _out116);
+          _2231_body = _out115;
+          _2232_bodyIdents = _out116;
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _2232_bodyIdents);
+          generated = RAST.Expr.create_Loop(Std.Wrappers.Option<RAST._IExpr>.create_Some(_2228_cond), _2231_body);
+        }
+      } else if (_source72.is_Foreach) {
+        Dafny.ISequence<Dafny.Rune> _2233___mcc_h13 = _source72.dtor_boundName;
+        DAST._IType _2234___mcc_h14 = _source72.dtor_boundType;
+        DAST._IExpression _2235___mcc_h15 = _source72.dtor_over;
+        Dafny.ISequence<DAST._IStatement> _2236___mcc_h16 = _source72.dtor_body;
+        Dafny.ISequence<DAST._IStatement> _2237_body = _2236___mcc_h16;
+        DAST._IExpression _2238_over = _2235___mcc_h15;
+        DAST._IType _2239_boundType = _2234___mcc_h14;
+        Dafny.ISequence<Dafny.Rune> _2240_boundName = _2233___mcc_h13;
+        {
+          RAST._IExpr _2241_over;
+          DCOMP._IOwnership _2242___v48;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2243_recIdents;
+          RAST._IExpr _out117;
+          DCOMP._IOwnership _out118;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out119;
+          (this).GenExpr(_2238_over, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out117, out _out118, out _out119);
+          _2241_over = _out117;
+          _2242___v48 = _out118;
+          _2243_recIdents = _out119;
+          RAST._IType _2244_boundTypeStr;
+          RAST._IType _out120;
+          _out120 = (this).GenType(_2239_boundType, false, false);
+          _2244_boundTypeStr = _out120;
+          readIdents = _2243_recIdents;
+          RAST._IExpr _2245_body;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2246_bodyIdents;
+          RAST._IExpr _out121;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out122;
+          (this).GenStmts(_2237_body, selfIdent, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Concat(@params, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(_2240_boundName)), false, earlyReturn, out _out121, out _out122);
+          _2245_body = _out121;
+          _2246_bodyIdents = _out122;
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Difference(Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _2246_bodyIdents), Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements(_2240_boundName));
+          generated = RAST.Expr.create_For(DCOMP.__default.escapeIdent(_2240_boundName), _2241_over, _2245_body);
+        }
+      } else if (_source72.is_Call) {
+        DAST._IExpression _2247___mcc_h17 = _source72.dtor_on;
+        DAST._ICallName _2248___mcc_h18 = _source72.dtor_callName;
+        Dafny.ISequence<DAST._IType> _2249___mcc_h19 = _source72.dtor_typeArgs;
+        Dafny.ISequence<DAST._IExpression> _2250___mcc_h20 = _source72.dtor_args;
+        Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> _2251___mcc_h21 = _source72.dtor_outs;
+        Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> _2252_maybeOutVars = _2251___mcc_h21;
+        Dafny.ISequence<DAST._IExpression> _2253_args = _2250___mcc_h20;
+        Dafny.ISequence<DAST._IType> _2254_typeArgs = _2249___mcc_h19;
+        DAST._ICallName _2255_name = _2248___mcc_h18;
+        DAST._IExpression _2256_on = _2247___mcc_h17;
+        {
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          Dafny.ISequence<Dafny.Rune> _2257_typeArgString;
+          _2257_typeArgString = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
+          if ((new BigInteger((_2254_typeArgs).Count)) >= (BigInteger.One)) {
+            BigInteger _2258_typeI;
+            _2258_typeI = BigInteger.Zero;
+            Dafny.ISequence<RAST._IType> _2259_typeArgsR;
+            _2259_typeArgsR = Dafny.Sequence<RAST._IType>.FromElements();
+            while ((_2258_typeI) < (new BigInteger((_2254_typeArgs).Count))) {
+              RAST._IType _2260_tpe;
+              RAST._IType _out123;
+              _out123 = (this).GenType((_2254_typeArgs).Select(_2258_typeI), false, false);
+              _2260_tpe = _out123;
+              _2259_typeArgsR = Dafny.Sequence<RAST._IType>.Concat(_2259_typeArgsR, Dafny.Sequence<RAST._IType>.FromElements(_2260_tpe));
+              _2258_typeI = (_2258_typeI) + (BigInteger.One);
+            }
+            _2257_typeArgString = (RAST.Type.create_TypeApp(RAST.Type.create_TIdentifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::")), _2259_typeArgsR))._ToString(DCOMP.__default.IND);
+          }
+          Dafny.ISequence<Dafny.Rune> _2261_argString;
+          _2261_argString = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
+          BigInteger _2262_i;
+          _2262_i = BigInteger.Zero;
+          while ((_2262_i) < (new BigInteger((_2253_args).Count))) {
+            if ((_2262_i).Sign == 1) {
+              _2261_argString = Dafny.Sequence<Dafny.Rune>.Concat(_2261_argString, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
+            }
+            RAST._IExpr _2263_argExpr;
+            DCOMP._IOwnership _2264_ownership;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2265_argIdents;
+            RAST._IExpr _out124;
+            DCOMP._IOwnership _out125;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out126;
+            (this).GenExpr((_2253_args).Select(_2262_i), selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out124, out _out125, out _out126);
+            _2263_argExpr = _out124;
+            _2264_ownership = _out125;
+            _2265_argIdents = _out126;
+            Dafny.ISequence<Dafny.Rune> _2266_argExprString;
+            _2266_argExprString = (_2263_argExpr)._ToString(DCOMP.__default.IND);
+            _2261_argString = Dafny.Sequence<Dafny.Rune>.Concat(_2261_argString, _2266_argExprString);
+            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _2265_argIdents);
+            _2262_i = (_2262_i) + (BigInteger.One);
+          }
+          RAST._IExpr _2267_onExpr;
+          DCOMP._IOwnership _2268___v49;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2269_enclosingIdents;
+          RAST._IExpr _out127;
+          DCOMP._IOwnership _out128;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out129;
+          (this).GenExpr(_2256_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipAutoBorrowed(), out _out127, out _out128, out _out129);
+          _2267_onExpr = _out127;
+          _2268___v49 = _out128;
+          _2269_enclosingIdents = _out129;
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _2269_enclosingIdents);
+          Dafny.ISequence<Dafny.Rune> _2270_enclosingString;
+          _2270_enclosingString = (_2267_onExpr)._ToString(DCOMP.__default.IND);
+          DAST._IExpression _source74 = _2256_on;
+          if (_source74.is_Literal) {
+            DAST._ILiteral _2271___mcc_h26 = _source74.dtor_Literal_a0;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_Ident) {
+            Dafny.ISequence<Dafny.Rune> _2272___mcc_h28 = _source74.dtor_Ident_a0;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_Companion) {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2273___mcc_h30 = _source74.dtor_Companion_a0;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(_2270_enclosingString, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::"));
+            }
+          } else if (_source74.is_Tuple) {
+            Dafny.ISequence<DAST._IExpression> _2274___mcc_h32 = _source74.dtor_Tuple_a0;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_New) {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2275___mcc_h34 = _source74.dtor_path;
+            Dafny.ISequence<DAST._IType> _2276___mcc_h35 = _source74.dtor_typeArgs;
+            Dafny.ISequence<DAST._IExpression> _2277___mcc_h36 = _source74.dtor_args;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_NewArray) {
+            Dafny.ISequence<DAST._IExpression> _2278___mcc_h40 = _source74.dtor_dims;
+            DAST._IType _2279___mcc_h41 = _source74.dtor_typ;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_DatatypeValue) {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2280___mcc_h44 = _source74.dtor_path;
+            Dafny.ISequence<DAST._IType> _2281___mcc_h45 = _source74.dtor_typeArgs;
+            Dafny.ISequence<Dafny.Rune> _2282___mcc_h46 = _source74.dtor_variant;
+            bool _2283___mcc_h47 = _source74.dtor_isCo;
+            Dafny.ISequence<_System._ITuple2<Dafny.ISequence<Dafny.Rune>, DAST._IExpression>> _2284___mcc_h48 = _source74.dtor_contents;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_Convert) {
+            DAST._IExpression _2285___mcc_h54 = _source74.dtor_value;
+            DAST._IType _2286___mcc_h55 = _source74.dtor_from;
+            DAST._IType _2287___mcc_h56 = _source74.dtor_typ;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_SeqConstruct) {
+            DAST._IExpression _2288___mcc_h60 = _source74.dtor_length;
+            DAST._IExpression _2289___mcc_h61 = _source74.dtor_elem;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_SeqValue) {
+            Dafny.ISequence<DAST._IExpression> _2290___mcc_h64 = _source74.dtor_elements;
+            DAST._IType _2291___mcc_h65 = _source74.dtor_typ;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_SetValue) {
+            Dafny.ISequence<DAST._IExpression> _2292___mcc_h68 = _source74.dtor_elements;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_MultisetValue) {
+            Dafny.ISequence<DAST._IExpression> _2293___mcc_h70 = _source74.dtor_elements;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_MapValue) {
+            Dafny.ISequence<_System._ITuple2<DAST._IExpression, DAST._IExpression>> _2294___mcc_h72 = _source74.dtor_mapElems;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_MapBuilder) {
+            DAST._IType _2295___mcc_h74 = _source74.dtor_keyType;
+            DAST._IType _2296___mcc_h75 = _source74.dtor_valueType;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_SeqUpdate) {
+            DAST._IExpression _2297___mcc_h78 = _source74.dtor_expr;
+            DAST._IExpression _2298___mcc_h79 = _source74.dtor_indexExpr;
+            DAST._IExpression _2299___mcc_h80 = _source74.dtor_value;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_MapUpdate) {
+            DAST._IExpression _2300___mcc_h84 = _source74.dtor_expr;
+            DAST._IExpression _2301___mcc_h85 = _source74.dtor_indexExpr;
+            DAST._IExpression _2302___mcc_h86 = _source74.dtor_value;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_SetBuilder) {
+            DAST._IType _2303___mcc_h90 = _source74.dtor_elemType;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_ToMultiset) {
+            DAST._IExpression _2304___mcc_h92 = _source74.dtor_ToMultiset_a0;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_This) {
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_Ite) {
+            DAST._IExpression _2305___mcc_h94 = _source74.dtor_cond;
+            DAST._IExpression _2306___mcc_h95 = _source74.dtor_thn;
+            DAST._IExpression _2307___mcc_h96 = _source74.dtor_els;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_UnOp) {
+            DAST._IUnaryOp _2308___mcc_h100 = _source74.dtor_unOp;
+            DAST._IExpression _2309___mcc_h101 = _source74.dtor_expr;
+            DAST.Format._IUnaryOpFormat _2310___mcc_h102 = _source74.dtor_format1;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_BinOp) {
+            DAST._IBinOp _2311___mcc_h106 = _source74.dtor_op;
+            DAST._IExpression _2312___mcc_h107 = _source74.dtor_left;
+            DAST._IExpression _2313___mcc_h108 = _source74.dtor_right;
+            DAST.Format._IBinaryOpFormat _2314___mcc_h109 = _source74.dtor_format2;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_ArrayLen) {
+            DAST._IExpression _2315___mcc_h114 = _source74.dtor_expr;
+            BigInteger _2316___mcc_h115 = _source74.dtor_dim;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_MapKeys) {
+            DAST._IExpression _2317___mcc_h118 = _source74.dtor_expr;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_MapValues) {
+            DAST._IExpression _2318___mcc_h120 = _source74.dtor_expr;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_Select) {
+            DAST._IExpression _2319___mcc_h122 = _source74.dtor_expr;
+            Dafny.ISequence<Dafny.Rune> _2320___mcc_h123 = _source74.dtor_field;
+            bool _2321___mcc_h124 = _source74.dtor_isConstant;
+            bool _2322___mcc_h125 = _source74.dtor_onDatatype;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_SelectFn) {
+            DAST._IExpression _2323___mcc_h130 = _source74.dtor_expr;
+            Dafny.ISequence<Dafny.Rune> _2324___mcc_h131 = _source74.dtor_field;
+            bool _2325___mcc_h132 = _source74.dtor_onDatatype;
+            bool _2326___mcc_h133 = _source74.dtor_isStatic;
+            BigInteger _2327___mcc_h134 = _source74.dtor_arity;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_Index) {
+            DAST._IExpression _2328___mcc_h140 = _source74.dtor_expr;
+            DAST._ICollKind _2329___mcc_h141 = _source74.dtor_collKind;
+            Dafny.ISequence<DAST._IExpression> _2330___mcc_h142 = _source74.dtor_indices;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_IndexRange) {
+            DAST._IExpression _2331___mcc_h146 = _source74.dtor_expr;
+            bool _2332___mcc_h147 = _source74.dtor_isArray;
+            Std.Wrappers._IOption<DAST._IExpression> _2333___mcc_h148 = _source74.dtor_low;
+            Std.Wrappers._IOption<DAST._IExpression> _2334___mcc_h149 = _source74.dtor_high;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_TupleSelect) {
+            DAST._IExpression _2335___mcc_h154 = _source74.dtor_expr;
+            BigInteger _2336___mcc_h155 = _source74.dtor_index;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_Call) {
+            DAST._IExpression _2337___mcc_h158 = _source74.dtor_on;
+            DAST._ICallName _2338___mcc_h159 = _source74.dtor_callName;
+            Dafny.ISequence<DAST._IType> _2339___mcc_h160 = _source74.dtor_typeArgs;
+            Dafny.ISequence<DAST._IExpression> _2340___mcc_h161 = _source74.dtor_args;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_Lambda) {
+            Dafny.ISequence<DAST._IFormal> _2341___mcc_h166 = _source74.dtor_params;
+            DAST._IType _2342___mcc_h167 = _source74.dtor_retType;
+            Dafny.ISequence<DAST._IStatement> _2343___mcc_h168 = _source74.dtor_body;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_BetaRedex) {
+            Dafny.ISequence<_System._ITuple2<DAST._IFormal, DAST._IExpression>> _2344___mcc_h172 = _source74.dtor_values;
+            DAST._IType _2345___mcc_h173 = _source74.dtor_retType;
+            DAST._IExpression _2346___mcc_h174 = _source74.dtor_expr;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_IIFE) {
+            Dafny.ISequence<Dafny.Rune> _2347___mcc_h178 = _source74.dtor_name;
+            DAST._IType _2348___mcc_h179 = _source74.dtor_typ;
+            DAST._IExpression _2349___mcc_h180 = _source74.dtor_value;
+            DAST._IExpression _2350___mcc_h181 = _source74.dtor_iifeBody;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_Apply) {
+            DAST._IExpression _2351___mcc_h186 = _source74.dtor_expr;
+            Dafny.ISequence<DAST._IExpression> _2352___mcc_h187 = _source74.dtor_args;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_TypeTest) {
+            DAST._IExpression _2353___mcc_h190 = _source74.dtor_on;
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2354___mcc_h191 = _source74.dtor_dType;
+            Dafny.ISequence<Dafny.Rune> _2355___mcc_h192 = _source74.dtor_variant;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_InitializationValue) {
+            DAST._IType _2356___mcc_h196 = _source74.dtor_typ;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_BoolBoundedPool) {
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_SetBoundedPool) {
+            DAST._IExpression _2357___mcc_h198 = _source74.dtor_of;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else if (_source74.is_SeqBoundedPool) {
+            DAST._IExpression _2358___mcc_h200 = _source74.dtor_of;
+            bool _2359___mcc_h201 = _source74.dtor_includeDuplicates;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          } else {
+            DAST._IExpression _2360___mcc_h204 = _source74.dtor_lo;
+            DAST._IExpression _2361___mcc_h205 = _source74.dtor_hi;
+            {
+              _2270_enclosingString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2270_enclosingString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")."));
+            }
+          }
+          Dafny.ISequence<Dafny.Rune> _2362_receiver;
+          _2362_receiver = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
+          Std.Wrappers._IOption<Dafny.ISequence<Dafny.ISequence<Dafny.Rune>>> _source75 = _2252_maybeOutVars;
+          if (_source75.is_None) {
+          } else {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2363___mcc_h208 = _source75.dtor_value;
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2364_outVars = _2363___mcc_h208;
+            {
+              if ((new BigInteger((_2364_outVars).Count)) > (BigInteger.One)) {
+                _2362_receiver = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(");
+              }
+              BigInteger _2365_outI;
+              _2365_outI = BigInteger.Zero;
+              while ((_2365_outI) < (new BigInteger((_2364_outVars).Count))) {
+                if ((_2365_outI).Sign == 1) {
+                  _2362_receiver = Dafny.Sequence<Dafny.Rune>.Concat(_2362_receiver, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
+                }
+                Dafny.ISequence<Dafny.Rune> _2366_outVar;
+                _2366_outVar = (_2364_outVars).Select(_2365_outI);
+                _2362_receiver = Dafny.Sequence<Dafny.Rune>.Concat(_2362_receiver, (_2366_outVar));
+                _2365_outI = (_2365_outI) + (BigInteger.One);
+              }
+              if ((new BigInteger((_2364_outVars).Count)) > (BigInteger.One)) {
+                _2362_receiver = Dafny.Sequence<Dafny.Rune>.Concat(_2362_receiver, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
+              }
+            }
+          }
+          Dafny.ISequence<Dafny.Rune> _2367_renderedName;
+          _2367_renderedName = ((System.Func<DAST._ICallName, Dafny.ISequence<Dafny.Rune>>)((_source76) => {
+            if (_source76.is_Name) {
+              Dafny.ISequence<Dafny.Rune> _2368___mcc_h209 = _source76.dtor_name;
+              Dafny.ISequence<Dafny.Rune> _2369_name = _2368___mcc_h209;
+              return DCOMP.__default.escapeIdent(_2369_name);
+            } else if (_source76.is_MapBuilderAdd) {
+              return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("add");
+            } else if (_source76.is_MapBuilderBuild) {
+              return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("build");
+            } else if (_source76.is_SetBuilderAdd) {
+              return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("add");
+            } else {
+              return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("build");
+            }
+          }))(_2255_name);
+          generated = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(((!(_2362_receiver).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))) ? (Dafny.Sequence<Dafny.Rune>.Concat(_2362_receiver, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" = "))) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))), _2270_enclosingString), _2367_renderedName), _2257_typeArgString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _2261_argString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(");")));
+        }
+      } else if (_source72.is_Return) {
+        DAST._IExpression _2370___mcc_h22 = _source72.dtor_expr;
+        DAST._IExpression _2371_expr = _2370___mcc_h22;
+        {
+          RAST._IExpr _2372_expr;
+          DCOMP._IOwnership _2373___v52;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2374_recIdents;
+          RAST._IExpr _out130;
+          DCOMP._IOwnership _out131;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out132;
+          (this).GenExpr(_2371_expr, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out130, out _out131, out _out132);
+          _2372_expr = _out130;
+          _2373___v52 = _out131;
+          _2374_recIdents = _out132;
+          readIdents = _2374_recIdents;
+          if (isLast) {
+            generated = _2372_expr;
+          } else {
+            generated = RAST.Expr.create_Return(Std.Wrappers.Option<RAST._IExpr>.create_Some(_2372_expr));
+          }
+        }
+      } else if (_source72.is_EarlyReturn) {
+        {
+          generated = earlyReturn;
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+        }
+      } else if (_source72.is_Break) {
+        Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _2375___mcc_h23 = _source72.dtor_toLabel;
+        Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _2376_toLabel = _2375___mcc_h23;
+        {
+          Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _source77 = _2376_toLabel;
+          if (_source77.is_None) {
+            {
+              generated = RAST.Expr.create_Break(Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None());
+            }
+          } else {
+            Dafny.ISequence<Dafny.Rune> _2377___mcc_h210 = _source77.dtor_value;
+            Dafny.ISequence<Dafny.Rune> _2378_lbl = _2377___mcc_h210;
+            {
+              generated = RAST.Expr.create_Break(Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_Some(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("label_"), _2378_lbl)));
+            }
+          }
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+        }
+      } else if (_source72.is_TailRecursive) {
+        Dafny.ISequence<DAST._IStatement> _2379___mcc_h24 = _source72.dtor_body;
+        Dafny.ISequence<DAST._IStatement> _2380_body = _2379___mcc_h24;
+        {
+          generated = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""));
+          if (!object.Equals(selfIdent, Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None())) {
+            generated = (generated).Then(RAST.Expr.create_DeclareVar(RAST.DeclareType.create_MUT(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_this"), Std.Wrappers.Option<RAST._IType>.create_None(), Std.Wrappers.Option<RAST._IExpr>.create_Some(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("self.clone()")))));
+          }
+          BigInteger _2381_paramI;
+          _2381_paramI = BigInteger.Zero;
+          while ((_2381_paramI) < (new BigInteger((@params).Count))) {
+            Dafny.ISequence<Dafny.Rune> _2382_param;
+            _2382_param = (@params).Select(_2381_paramI);
+            generated = (generated).Then(RAST.Expr.create_DeclareVar(RAST.DeclareType.create_MUT(), DCOMP.__default.escapeIdent(_2382_param), Std.Wrappers.Option<RAST._IType>.create_None(), Std.Wrappers.Option<RAST._IExpr>.create_Some(RAST.__default.Clone(RAST.Expr.create_Identifier(DCOMP.__default.escapeIdent(_2382_param))))));
+            _2381_paramI = (_2381_paramI) + (BigInteger.One);
+          }
+          RAST._IExpr _2383_body;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2384_bodyIdents;
+          RAST._IExpr _out133;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out134;
+          (this).GenStmts(_2380_body, ((!object.Equals(selfIdent, Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None())) ? (Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_Some(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_this"))) : (Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None())), Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(), false, earlyReturn, out _out133, out _out134);
+          _2383_body = _out133;
+          _2384_bodyIdents = _out134;
+          readIdents = _2384_bodyIdents;
+          generated = (generated).Then(RAST.Expr.create_Labelled(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("TAIL_CALL_START"), RAST.Expr.create_Loop(Std.Wrappers.Option<RAST._IExpr>.create_None(), _2383_body)));
+        }
+      } else if (_source72.is_JumpTailCallStart) {
+        {
+          generated = RAST.Expr.create_Continue(Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_Some(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("TAIL_CALL_START")));
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+        }
+      } else if (_source72.is_Halt) {
+        {
+          generated = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("panic!(\"Halt\");"));
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+        }
+      } else {
+        DAST._IExpression _2385___mcc_h25 = _source72.dtor_Print_a0;
+        DAST._IExpression _2386_e = _2385___mcc_h25;
+        {
+          RAST._IExpr _2387_printedExpr;
+          DCOMP._IOwnership _2388_recOwnership;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2389_recIdents;
+          RAST._IExpr _out135;
+          DCOMP._IOwnership _out136;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out137;
+          (this).GenExpr(_2386_e, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out135, out _out136, out _out137);
+          _2387_printedExpr = _out135;
+          _2388_recOwnership = _out136;
+          _2389_recIdents = _out137;
+          Dafny.ISequence<Dafny.Rune> _2390_printedExprString;
+          _2390_printedExprString = (_2387_printedExpr)._ToString(DCOMP.__default.IND);
+          generated = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("print!(\"{}\", ::dafny_runtime::DafnyPrintWrapper("), _2390_printedExprString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("));")));
+          readIdents = _2389_recIdents;
+        }
+      }
+    }
+    public static Std.Wrappers._IOption<RAST._IType> NewtypeToRustType(DAST._IType @base, DAST._INewtypeRange range)
+    {
+      DAST._INewtypeRange _source78 = range;
+      if (_source78.is_U8) {
+        return Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_U8());
+      } else if (_source78.is_I8) {
+        return Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_I8());
+      } else if (_source78.is_U16) {
+        return Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_U16());
+      } else if (_source78.is_I16) {
+        return Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_I16());
+      } else if (_source78.is_U32) {
+        return Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_U32());
+      } else if (_source78.is_I32) {
+        return Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_I32());
+      } else if (_source78.is_U64) {
+        return Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_U64());
+      } else if (_source78.is_I64) {
+        return Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_I64());
+      } else if (_source78.is_U128) {
+        return Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_U128());
+      } else if (_source78.is_I128) {
+        return Std.Wrappers.Option<RAST._IType>.create_Some(RAST.Type.create_I128());
+      } else if (_source78.is_BigInt) {
+        return Std.Wrappers.Option<RAST._IType>.create_None();
+      } else {
+        return Std.Wrappers.Option<RAST._IType>.create_None();
+      }
+    }
+    public static void FromOwned(RAST._IExpr r, DCOMP._IOwnership expectedOwnership, out RAST._IExpr @out, out DCOMP._IOwnership resultingOwnership)
+    {
+      @out = RAST.Expr.Default();
+      resultingOwnership = DCOMP.Ownership.Default();
+      if ((object.Equals(expectedOwnership, DCOMP.Ownership.create_OwnershipOwned())) || (object.Equals(expectedOwnership, DCOMP.Ownership.create_OwnershipAutoBorrowed()))) {
+        @out = r;
+        resultingOwnership = DCOMP.Ownership.create_OwnershipOwned();
+      } else if (object.Equals(expectedOwnership, DCOMP.Ownership.create_OwnershipBorrowed())) {
+        @out = RAST.__default.Borrow(r);
+        resultingOwnership = DCOMP.Ownership.create_OwnershipBorrowed();
+      } else {
+        @out = RAST.__default.BorrowMut(r);
+        resultingOwnership = DCOMP.Ownership.create_OwnershipBorrowedMut();
+      }
+    }
+    public static void FromOwnership(RAST._IExpr r, DCOMP._IOwnership ownership, DCOMP._IOwnership expectedOwnership, out RAST._IExpr @out, out DCOMP._IOwnership resultingOwnership)
+    {
+      @out = RAST.Expr.Default();
+      resultingOwnership = DCOMP.Ownership.Default();
+      if (object.Equals(ownership, DCOMP.Ownership.create_OwnershipOwned())) {
+        RAST._IExpr _out138;
+        DCOMP._IOwnership _out139;
+        DCOMP.COMP.FromOwned(r, expectedOwnership, out _out138, out _out139);
+        @out = _out138;
+        resultingOwnership = _out139;
+        return ;
+      } else if ((object.Equals(ownership, DCOMP.Ownership.create_OwnershipBorrowed())) || (object.Equals(ownership, DCOMP.Ownership.create_OwnershipBorrowedMut()))) {
+        if (object.Equals(expectedOwnership, DCOMP.Ownership.create_OwnershipOwned())) {
+          resultingOwnership = DCOMP.Ownership.create_OwnershipOwned();
+          @out = RAST.__default.Clone(r);
+        } else if ((object.Equals(expectedOwnership, ownership)) || (object.Equals(expectedOwnership, DCOMP.Ownership.create_OwnershipAutoBorrowed()))) {
+          resultingOwnership = ownership;
+          @out = r;
+        } else if ((object.Equals(expectedOwnership, DCOMP.Ownership.create_OwnershipBorrowed())) && (object.Equals(ownership, DCOMP.Ownership.create_OwnershipBorrowedMut()))) {
+          resultingOwnership = DCOMP.Ownership.create_OwnershipBorrowed();
+          @out = r;
+        } else {
+          resultingOwnership = DCOMP.Ownership.create_OwnershipBorrowedMut();
+          @out = RAST.__default.BorrowMut(r);
+        }
+      } else {
+      }
+    }
+    public static bool OwnershipGuarantee(DCOMP._IOwnership expectedOwnership, DCOMP._IOwnership resultingOwnership)
+    {
+      return (!(!object.Equals(expectedOwnership, DCOMP.Ownership.create_OwnershipAutoBorrowed())) || (object.Equals(resultingOwnership, expectedOwnership))) && (!object.Equals(resultingOwnership, DCOMP.Ownership.create_OwnershipAutoBorrowed()));
+    }
+    public void GenExprLiteral(DAST._IExpression e, Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> selfIdent, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> @params, DCOMP._IOwnership expectedOwnership, out RAST._IExpr r, out DCOMP._IOwnership resultingOwnership, out Dafny.ISet<Dafny.ISequence<Dafny.Rune>> readIdents)
+    {
+      r = RAST.Expr.Default();
+      resultingOwnership = DCOMP.Ownership.Default();
+      readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Empty;
+      DAST._IExpression _source79 = e;
+      DAST._ILiteral _2391___mcc_h0 = _source79.dtor_Literal_a0;
+      DAST._ILiteral _source80 = _2391___mcc_h0;
+      if (_source80.is_BoolLiteral) {
+        bool _2392___mcc_h1 = _source80.dtor_BoolLiteral_a0;
+        if ((_2392___mcc_h1) == (false)) {
+          {
+            RAST._IExpr _out140;
+            DCOMP._IOwnership _out141;
+            DCOMP.COMP.FromOwned(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("false")), expectedOwnership, out _out140, out _out141);
+            r = _out140;
+            resultingOwnership = _out141;
+            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+            return ;
+          }
+        } else {
+          {
+            RAST._IExpr _out142;
+            DCOMP._IOwnership _out143;
+            DCOMP.COMP.FromOwned(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("true")), expectedOwnership, out _out142, out _out143);
+            r = _out142;
+            resultingOwnership = _out143;
+            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+            return ;
+          }
+        }
+      } else if (_source80.is_IntLiteral) {
+        Dafny.ISequence<Dafny.Rune> _2393___mcc_h2 = _source80.dtor_IntLiteral_a0;
+        DAST._IType _2394___mcc_h3 = _source80.dtor_IntLiteral_a1;
+        DAST._IType _2395_t = _2394___mcc_h3;
+        Dafny.ISequence<Dafny.Rune> _2396_i = _2393___mcc_h2;
+        {
+          DAST._IType _source81 = _2395_t;
+          if (_source81.is_Path) {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2397___mcc_h100 = _source81.dtor_Path_a0;
+            Dafny.ISequence<DAST._IType> _2398___mcc_h101 = _source81.dtor_typeArgs;
+            DAST._IResolvedType _2399___mcc_h102 = _source81.dtor_resolved;
+            DAST._IType _2400_o = _2395_t;
+            {
+              RAST._IType _2401_genType;
+              RAST._IType _out144;
+              _out144 = (this).GenType(_2400_o, false, false);
+              _2401_genType = _out144;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(_2396_i), _2401_genType);
+            }
+          } else if (_source81.is_Nullable) {
+            DAST._IType _2402___mcc_h106 = _source81.dtor_Nullable_a0;
+            DAST._IType _2403_o = _2395_t;
+            {
+              RAST._IType _2404_genType;
+              RAST._IType _out145;
+              _out145 = (this).GenType(_2403_o, false, false);
+              _2404_genType = _out145;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(_2396_i), _2404_genType);
+            }
+          } else if (_source81.is_Tuple) {
+            Dafny.ISequence<DAST._IType> _2405___mcc_h108 = _source81.dtor_Tuple_a0;
+            DAST._IType _2406_o = _2395_t;
+            {
+              RAST._IType _2407_genType;
+              RAST._IType _out146;
+              _out146 = (this).GenType(_2406_o, false, false);
+              _2407_genType = _out146;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(_2396_i), _2407_genType);
+            }
+          } else if (_source81.is_Array) {
+            DAST._IType _2408___mcc_h110 = _source81.dtor_element;
+            BigInteger _2409___mcc_h111 = _source81.dtor_dims;
+            DAST._IType _2410_o = _2395_t;
+            {
+              RAST._IType _2411_genType;
+              RAST._IType _out147;
+              _out147 = (this).GenType(_2410_o, false, false);
+              _2411_genType = _out147;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(_2396_i), _2411_genType);
+            }
+          } else if (_source81.is_Seq) {
+            DAST._IType _2412___mcc_h114 = _source81.dtor_element;
+            DAST._IType _2413_o = _2395_t;
+            {
+              RAST._IType _2414_genType;
+              RAST._IType _out148;
+              _out148 = (this).GenType(_2413_o, false, false);
+              _2414_genType = _out148;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(_2396_i), _2414_genType);
+            }
+          } else if (_source81.is_Set) {
+            DAST._IType _2415___mcc_h116 = _source81.dtor_element;
+            DAST._IType _2416_o = _2395_t;
+            {
+              RAST._IType _2417_genType;
+              RAST._IType _out149;
+              _out149 = (this).GenType(_2416_o, false, false);
+              _2417_genType = _out149;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(_2396_i), _2417_genType);
+            }
+          } else if (_source81.is_Multiset) {
+            DAST._IType _2418___mcc_h118 = _source81.dtor_element;
+            DAST._IType _2419_o = _2395_t;
+            {
+              RAST._IType _2420_genType;
+              RAST._IType _out150;
+              _out150 = (this).GenType(_2419_o, false, false);
+              _2420_genType = _out150;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(_2396_i), _2420_genType);
+            }
+          } else if (_source81.is_Map) {
+            DAST._IType _2421___mcc_h120 = _source81.dtor_key;
+            DAST._IType _2422___mcc_h121 = _source81.dtor_value;
+            DAST._IType _2423_o = _2395_t;
+            {
+              RAST._IType _2424_genType;
+              RAST._IType _out151;
+              _out151 = (this).GenType(_2423_o, false, false);
+              _2424_genType = _out151;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(_2396_i), _2424_genType);
+            }
+          } else if (_source81.is_SetBuilder) {
+            DAST._IType _2425___mcc_h124 = _source81.dtor_element;
+            DAST._IType _2426_o = _2395_t;
+            {
+              RAST._IType _2427_genType;
+              RAST._IType _out152;
+              _out152 = (this).GenType(_2426_o, false, false);
+              _2427_genType = _out152;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(_2396_i), _2427_genType);
+            }
+          } else if (_source81.is_MapBuilder) {
+            DAST._IType _2428___mcc_h126 = _source81.dtor_key;
+            DAST._IType _2429___mcc_h127 = _source81.dtor_value;
+            DAST._IType _2430_o = _2395_t;
+            {
+              RAST._IType _2431_genType;
+              RAST._IType _out153;
+              _out153 = (this).GenType(_2430_o, false, false);
+              _2431_genType = _out153;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(_2396_i), _2431_genType);
+            }
+          } else if (_source81.is_Arrow) {
+            Dafny.ISequence<DAST._IType> _2432___mcc_h130 = _source81.dtor_args;
+            DAST._IType _2433___mcc_h131 = _source81.dtor_result;
+            DAST._IType _2434_o = _2395_t;
+            {
+              RAST._IType _2435_genType;
+              RAST._IType _out154;
+              _out154 = (this).GenType(_2434_o, false, false);
+              _2435_genType = _out154;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(_2396_i), _2435_genType);
+            }
+          } else if (_source81.is_Primitive) {
+            DAST._IPrimitive _2436___mcc_h134 = _source81.dtor_Primitive_a0;
+            DAST._IPrimitive _source82 = _2436___mcc_h134;
+            if (_source82.is_Int) {
+              {
+                if ((new BigInteger((_2396_i).Count)) <= (new BigInteger(4))) {
+                  r = (((RAST.__default.dafny__runtime).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("DafnyInt"))).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("from"))).Apply1(RAST.Expr.create_LiteralInt(_2396_i));
+                } else {
+                  r = (((RAST.__default.dafny__runtime).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("DafnyInt"))).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("from"))).Apply1(RAST.Expr.create_LiteralString(_2396_i, true));
+                }
+              }
+            } else if (_source82.is_Real) {
+              DAST._IType _2437_o = _2395_t;
+              {
+                RAST._IType _2438_genType;
+                RAST._IType _out155;
+                _out155 = (this).GenType(_2437_o, false, false);
+                _2438_genType = _out155;
+                r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(_2396_i), _2438_genType);
+              }
+            } else if (_source82.is_String) {
+              DAST._IType _2439_o = _2395_t;
+              {
+                RAST._IType _2440_genType;
+                RAST._IType _out156;
+                _out156 = (this).GenType(_2439_o, false, false);
+                _2440_genType = _out156;
+                r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(_2396_i), _2440_genType);
+              }
+            } else if (_source82.is_Bool) {
+              DAST._IType _2441_o = _2395_t;
+              {
+                RAST._IType _2442_genType;
+                RAST._IType _out157;
+                _out157 = (this).GenType(_2441_o, false, false);
+                _2442_genType = _out157;
+                r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(_2396_i), _2442_genType);
+              }
+            } else {
+              DAST._IType _2443_o = _2395_t;
+              {
+                RAST._IType _2444_genType;
+                RAST._IType _out158;
+                _out158 = (this).GenType(_2443_o, false, false);
+                _2444_genType = _out158;
+                r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(_2396_i), _2444_genType);
+              }
+            }
+          } else if (_source81.is_Passthrough) {
+            Dafny.ISequence<Dafny.Rune> _2445___mcc_h136 = _source81.dtor_Passthrough_a0;
+            DAST._IType _2446_o = _2395_t;
+            {
+              RAST._IType _2447_genType;
+              RAST._IType _out159;
+              _out159 = (this).GenType(_2446_o, false, false);
+              _2447_genType = _out159;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(_2396_i), _2447_genType);
+            }
+          } else {
+            Dafny.ISequence<Dafny.Rune> _2448___mcc_h138 = _source81.dtor_TypeArg_a0;
+            DAST._IType _2449_o = _2395_t;
+            {
+              RAST._IType _2450_genType;
+              RAST._IType _out160;
+              _out160 = (this).GenType(_2449_o, false, false);
+              _2450_genType = _out160;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(_2396_i), _2450_genType);
+            }
+          }
+          RAST._IExpr _out161;
+          DCOMP._IOwnership _out162;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out161, out _out162);
+          r = _out161;
+          resultingOwnership = _out162;
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          return ;
+        }
+      } else if (_source80.is_DecLiteral) {
+        Dafny.ISequence<Dafny.Rune> _2451___mcc_h4 = _source80.dtor_DecLiteral_a0;
+        Dafny.ISequence<Dafny.Rune> _2452___mcc_h5 = _source80.dtor_DecLiteral_a1;
+        DAST._IType _2453___mcc_h6 = _source80.dtor_DecLiteral_a2;
+        DAST._IType _2454_t = _2453___mcc_h6;
+        Dafny.ISequence<Dafny.Rune> _2455_d = _2452___mcc_h5;
+        Dafny.ISequence<Dafny.Rune> _2456_n = _2451___mcc_h4;
+        {
+          DAST._IType _source83 = _2454_t;
+          if (_source83.is_Path) {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2457___mcc_h140 = _source83.dtor_Path_a0;
+            Dafny.ISequence<DAST._IType> _2458___mcc_h141 = _source83.dtor_typeArgs;
+            DAST._IResolvedType _2459___mcc_h142 = _source83.dtor_resolved;
+            DAST._IType _2460_o = _2454_t;
+            {
+              RAST._IType _2461_genType;
+              RAST._IType _out163;
+              _out163 = (this).GenType(_2460_o, false, false);
+              _2461_genType = _out163;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2456_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _2455_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"))), _2461_genType);
+            }
+          } else if (_source83.is_Nullable) {
+            DAST._IType _2462___mcc_h146 = _source83.dtor_Nullable_a0;
+            DAST._IType _2463_o = _2454_t;
+            {
+              RAST._IType _2464_genType;
+              RAST._IType _out164;
+              _out164 = (this).GenType(_2463_o, false, false);
+              _2464_genType = _out164;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2456_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _2455_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"))), _2464_genType);
+            }
+          } else if (_source83.is_Tuple) {
+            Dafny.ISequence<DAST._IType> _2465___mcc_h148 = _source83.dtor_Tuple_a0;
+            DAST._IType _2466_o = _2454_t;
+            {
+              RAST._IType _2467_genType;
+              RAST._IType _out165;
+              _out165 = (this).GenType(_2466_o, false, false);
+              _2467_genType = _out165;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2456_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _2455_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"))), _2467_genType);
+            }
+          } else if (_source83.is_Array) {
+            DAST._IType _2468___mcc_h150 = _source83.dtor_element;
+            BigInteger _2469___mcc_h151 = _source83.dtor_dims;
+            DAST._IType _2470_o = _2454_t;
+            {
+              RAST._IType _2471_genType;
+              RAST._IType _out166;
+              _out166 = (this).GenType(_2470_o, false, false);
+              _2471_genType = _out166;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2456_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _2455_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"))), _2471_genType);
+            }
+          } else if (_source83.is_Seq) {
+            DAST._IType _2472___mcc_h154 = _source83.dtor_element;
+            DAST._IType _2473_o = _2454_t;
+            {
+              RAST._IType _2474_genType;
+              RAST._IType _out167;
+              _out167 = (this).GenType(_2473_o, false, false);
+              _2474_genType = _out167;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2456_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _2455_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"))), _2474_genType);
+            }
+          } else if (_source83.is_Set) {
+            DAST._IType _2475___mcc_h156 = _source83.dtor_element;
+            DAST._IType _2476_o = _2454_t;
+            {
+              RAST._IType _2477_genType;
+              RAST._IType _out168;
+              _out168 = (this).GenType(_2476_o, false, false);
+              _2477_genType = _out168;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2456_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _2455_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"))), _2477_genType);
+            }
+          } else if (_source83.is_Multiset) {
+            DAST._IType _2478___mcc_h158 = _source83.dtor_element;
+            DAST._IType _2479_o = _2454_t;
+            {
+              RAST._IType _2480_genType;
+              RAST._IType _out169;
+              _out169 = (this).GenType(_2479_o, false, false);
+              _2480_genType = _out169;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2456_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _2455_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"))), _2480_genType);
+            }
+          } else if (_source83.is_Map) {
+            DAST._IType _2481___mcc_h160 = _source83.dtor_key;
+            DAST._IType _2482___mcc_h161 = _source83.dtor_value;
+            DAST._IType _2483_o = _2454_t;
+            {
+              RAST._IType _2484_genType;
+              RAST._IType _out170;
+              _out170 = (this).GenType(_2483_o, false, false);
+              _2484_genType = _out170;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2456_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _2455_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"))), _2484_genType);
+            }
+          } else if (_source83.is_SetBuilder) {
+            DAST._IType _2485___mcc_h164 = _source83.dtor_element;
+            DAST._IType _2486_o = _2454_t;
+            {
+              RAST._IType _2487_genType;
+              RAST._IType _out171;
+              _out171 = (this).GenType(_2486_o, false, false);
+              _2487_genType = _out171;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2456_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _2455_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"))), _2487_genType);
+            }
+          } else if (_source83.is_MapBuilder) {
+            DAST._IType _2488___mcc_h166 = _source83.dtor_key;
+            DAST._IType _2489___mcc_h167 = _source83.dtor_value;
+            DAST._IType _2490_o = _2454_t;
+            {
+              RAST._IType _2491_genType;
+              RAST._IType _out172;
+              _out172 = (this).GenType(_2490_o, false, false);
+              _2491_genType = _out172;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2456_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _2455_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"))), _2491_genType);
+            }
+          } else if (_source83.is_Arrow) {
+            Dafny.ISequence<DAST._IType> _2492___mcc_h170 = _source83.dtor_args;
+            DAST._IType _2493___mcc_h171 = _source83.dtor_result;
+            DAST._IType _2494_o = _2454_t;
+            {
+              RAST._IType _2495_genType;
+              RAST._IType _out173;
+              _out173 = (this).GenType(_2494_o, false, false);
+              _2495_genType = _out173;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2456_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _2455_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"))), _2495_genType);
+            }
+          } else if (_source83.is_Primitive) {
+            DAST._IPrimitive _2496___mcc_h174 = _source83.dtor_Primitive_a0;
+            DAST._IPrimitive _source84 = _2496___mcc_h174;
+            if (_source84.is_Int) {
+              DAST._IType _2497_o = _2454_t;
+              {
+                RAST._IType _2498_genType;
+                RAST._IType _out174;
+                _out174 = (this).GenType(_2497_o, false, false);
+                _2498_genType = _out174;
+                r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2456_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _2455_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"))), _2498_genType);
+              }
+            } else if (_source84.is_Real) {
+              {
+                r = RAST.__default.RcNew(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::BigRational::new(::dafny_runtime::BigInt::parse_bytes(b\""), _2456_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\", 10).unwrap(), ::dafny_runtime::BigInt::parse_bytes(b\"")), _2455_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\", 10).unwrap())"))));
+              }
+            } else if (_source84.is_String) {
+              DAST._IType _2499_o = _2454_t;
+              {
+                RAST._IType _2500_genType;
+                RAST._IType _out175;
+                _out175 = (this).GenType(_2499_o, false, false);
+                _2500_genType = _out175;
+                r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2456_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _2455_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"))), _2500_genType);
+              }
+            } else if (_source84.is_Bool) {
+              DAST._IType _2501_o = _2454_t;
+              {
+                RAST._IType _2502_genType;
+                RAST._IType _out176;
+                _out176 = (this).GenType(_2501_o, false, false);
+                _2502_genType = _out176;
+                r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2456_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _2455_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"))), _2502_genType);
+              }
+            } else {
+              DAST._IType _2503_o = _2454_t;
+              {
+                RAST._IType _2504_genType;
+                RAST._IType _out177;
+                _out177 = (this).GenType(_2503_o, false, false);
+                _2504_genType = _out177;
+                r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2456_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _2455_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"))), _2504_genType);
+              }
+            }
+          } else if (_source83.is_Passthrough) {
+            Dafny.ISequence<Dafny.Rune> _2505___mcc_h176 = _source83.dtor_Passthrough_a0;
+            DAST._IType _2506_o = _2454_t;
+            {
+              RAST._IType _2507_genType;
+              RAST._IType _out178;
+              _out178 = (this).GenType(_2506_o, false, false);
+              _2507_genType = _out178;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2456_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _2455_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"))), _2507_genType);
+            }
+          } else {
+            Dafny.ISequence<Dafny.Rune> _2508___mcc_h178 = _source83.dtor_TypeArg_a0;
+            DAST._IType _2509_o = _2454_t;
+            {
+              RAST._IType _2510_genType;
+              RAST._IType _out179;
+              _out179 = (this).GenType(_2509_o, false, false);
+              _2510_genType = _out179;
+              r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), _2456_n), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0 / ")), _2455_d), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"))), _2510_genType);
+            }
+          }
+          RAST._IExpr _out180;
+          DCOMP._IOwnership _out181;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out180, out _out181);
+          r = _out180;
+          resultingOwnership = _out181;
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          return ;
+        }
+      } else if (_source80.is_StringLiteral) {
+        Dafny.ISequence<Dafny.Rune> _2511___mcc_h7 = _source80.dtor_StringLiteral_a0;
+        Dafny.ISequence<Dafny.Rune> _2512_l = _2511___mcc_h7;
+        {
+          r = ((RAST.__default.dafny__runtime).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("string_of"))).Apply1(RAST.Expr.create_LiteralString(_2512_l, false));
+          RAST._IExpr _out182;
+          DCOMP._IOwnership _out183;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out182, out _out183);
+          r = _out182;
+          resultingOwnership = _out183;
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          return ;
+        }
+      } else if (_source80.is_CharLiteral) {
+        Dafny.Rune _2513___mcc_h8 = _source80.dtor_CharLiteral_a0;
+        Dafny.Rune _2514_c = _2513___mcc_h8;
+        {
+          r = RAST.Expr.create_LiteralInt(Std.Strings.__default.OfNat(new BigInteger((_2514_c).Value)));
+          if (!((this).UnicodeChars)) {
+            r = (((((((RAST.__default.@global).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("std"))).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("primitive"))).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("char"))).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("from_u16"))).Apply1(r)).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unwrap"))).Apply(Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+          } else {
+            r = (((((((RAST.__default.@global).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("std"))).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("primitive"))).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("char"))).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("from_u32"))).Apply1(r)).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unwrap"))).Apply(Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+          }
+          r = ((RAST.__default.dafny__runtime).MSel((this).DafnyChar)).Apply1(r);
+          RAST._IExpr _out184;
+          DCOMP._IOwnership _out185;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out184, out _out185);
+          r = _out184;
+          resultingOwnership = _out185;
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          return ;
+        }
+      } else {
+        DAST._IType _2515___mcc_h9 = _source80.dtor_Null_a0;
+        DAST._IType _2516_tpe = _2515___mcc_h9;
+        {
+          RAST._IType _2517_tpeGen;
+          RAST._IType _out186;
+          _out186 = (this).GenType(_2516_tpe, false, false);
+          _2517_tpeGen = _out186;
+          r = RAST.Expr.create_TypeAscription(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("None")), _2517_tpeGen);
+          RAST._IExpr _out187;
+          DCOMP._IOwnership _out188;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out187, out _out188);
+          r = _out187;
+          resultingOwnership = _out188;
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          return ;
+        }
+      }
+    }
+    public void GenExprBinary(DAST._IExpression e, Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> selfIdent, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> @params, DCOMP._IOwnership expectedOwnership, out RAST._IExpr r, out DCOMP._IOwnership resultingOwnership, out Dafny.ISet<Dafny.ISequence<Dafny.Rune>> readIdents)
+    {
+      r = RAST.Expr.Default();
+      resultingOwnership = DCOMP.Ownership.Default();
+      readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Empty;
+      DAST._IExpression _let_tmp_rhs49 = e;
+      DAST._IBinOp _2518_op = _let_tmp_rhs49.dtor_op;
+      DAST._IExpression _2519_lExpr = _let_tmp_rhs49.dtor_left;
+      DAST._IExpression _2520_rExpr = _let_tmp_rhs49.dtor_right;
+      DAST.Format._IBinaryOpFormat _2521_format = _let_tmp_rhs49.dtor_format2;
+      bool _2522_becomesLeftCallsRight;
+      _2522_becomesLeftCallsRight = ((System.Func<DAST._IBinOp, bool>)((_source85) => {
+        if (_source85.is_Eq) {
+          bool _2523___mcc_h0 = _source85.dtor_referential;
+          bool _2524___mcc_h1 = _source85.dtor_nullable;
+          return false;
+        } else if (_source85.is_Div) {
+          return false;
+        } else if (_source85.is_EuclidianDiv) {
+          return false;
+        } else if (_source85.is_Mod) {
+          return false;
+        } else if (_source85.is_EuclidianMod) {
+          return false;
+        } else if (_source85.is_Lt) {
+          return false;
+        } else if (_source85.is_LtChar) {
+          return false;
+        } else if (_source85.is_Plus) {
+          return false;
+        } else if (_source85.is_Minus) {
+          return false;
+        } else if (_source85.is_Times) {
+          return false;
+        } else if (_source85.is_BitwiseAnd) {
+          return false;
+        } else if (_source85.is_BitwiseOr) {
+          return false;
+        } else if (_source85.is_BitwiseXor) {
+          return false;
+        } else if (_source85.is_BitwiseShiftRight) {
+          return false;
+        } else if (_source85.is_BitwiseShiftLeft) {
+          return false;
+        } else if (_source85.is_And) {
+          return false;
+        } else if (_source85.is_Or) {
+          return false;
+        } else if (_source85.is_In) {
+          return false;
+        } else if (_source85.is_SeqProperPrefix) {
+          return false;
+        } else if (_source85.is_SeqPrefix) {
+          return false;
+        } else if (_source85.is_SetMerge) {
+          return true;
+        } else if (_source85.is_SetSubtraction) {
+          return true;
+        } else if (_source85.is_SetIntersection) {
+          return true;
+        } else if (_source85.is_Subset) {
+          return false;
+        } else if (_source85.is_ProperSubset) {
+          return false;
+        } else if (_source85.is_SetDisjoint) {
+          return true;
+        } else if (_source85.is_MapMerge) {
+          return true;
+        } else if (_source85.is_MapSubtraction) {
+          return true;
+        } else if (_source85.is_MultisetMerge) {
+          return true;
+        } else if (_source85.is_MultisetSubtraction) {
+          return true;
+        } else if (_source85.is_MultisetIntersection) {
+          return true;
+        } else if (_source85.is_Submultiset) {
+          return false;
+        } else if (_source85.is_ProperSubmultiset) {
+          return false;
+        } else if (_source85.is_MultisetDisjoint) {
+          return true;
+        } else if (_source85.is_Concat) {
+          return true;
+        } else {
+          Dafny.ISequence<Dafny.Rune> _2525___mcc_h4 = _source85.dtor_Passthrough_a0;
+          return false;
+        }
+      }))(_2518_op);
+      bool _2526_becomesRightCallsLeft;
+      _2526_becomesRightCallsLeft = ((System.Func<DAST._IBinOp, bool>)((_source86) => {
+        if (_source86.is_Eq) {
+          bool _2527___mcc_h6 = _source86.dtor_referential;
+          bool _2528___mcc_h7 = _source86.dtor_nullable;
+          return false;
+        } else if (_source86.is_Div) {
+          return false;
+        } else if (_source86.is_EuclidianDiv) {
+          return false;
+        } else if (_source86.is_Mod) {
+          return false;
+        } else if (_source86.is_EuclidianMod) {
+          return false;
+        } else if (_source86.is_Lt) {
+          return false;
+        } else if (_source86.is_LtChar) {
+          return false;
+        } else if (_source86.is_Plus) {
+          return false;
+        } else if (_source86.is_Minus) {
+          return false;
+        } else if (_source86.is_Times) {
+          return false;
+        } else if (_source86.is_BitwiseAnd) {
+          return false;
+        } else if (_source86.is_BitwiseOr) {
+          return false;
+        } else if (_source86.is_BitwiseXor) {
+          return false;
+        } else if (_source86.is_BitwiseShiftRight) {
+          return false;
+        } else if (_source86.is_BitwiseShiftLeft) {
+          return false;
+        } else if (_source86.is_And) {
+          return false;
+        } else if (_source86.is_Or) {
+          return false;
+        } else if (_source86.is_In) {
+          return true;
+        } else if (_source86.is_SeqProperPrefix) {
+          return false;
+        } else if (_source86.is_SeqPrefix) {
+          return false;
+        } else if (_source86.is_SetMerge) {
+          return false;
+        } else if (_source86.is_SetSubtraction) {
+          return false;
+        } else if (_source86.is_SetIntersection) {
+          return false;
+        } else if (_source86.is_Subset) {
+          return false;
+        } else if (_source86.is_ProperSubset) {
+          return false;
+        } else if (_source86.is_SetDisjoint) {
+          return false;
+        } else if (_source86.is_MapMerge) {
+          return false;
+        } else if (_source86.is_MapSubtraction) {
+          return false;
+        } else if (_source86.is_MultisetMerge) {
+          return false;
+        } else if (_source86.is_MultisetSubtraction) {
+          return false;
+        } else if (_source86.is_MultisetIntersection) {
+          return false;
+        } else if (_source86.is_Submultiset) {
+          return false;
+        } else if (_source86.is_ProperSubmultiset) {
+          return false;
+        } else if (_source86.is_MultisetDisjoint) {
+          return false;
+        } else if (_source86.is_Concat) {
+          return false;
+        } else {
+          Dafny.ISequence<Dafny.Rune> _2529___mcc_h10 = _source86.dtor_Passthrough_a0;
+          return false;
+        }
+      }))(_2518_op);
+      bool _2530_becomesCallLeftRight;
+      _2530_becomesCallLeftRight = ((System.Func<DAST._IBinOp, bool>)((_source87) => {
+        if (_source87.is_Eq) {
+          bool _2531___mcc_h12 = _source87.dtor_referential;
+          bool _2532___mcc_h13 = _source87.dtor_nullable;
+          if ((_2531___mcc_h12) == (true)) {
+            if ((_2532___mcc_h13) == (false)) {
+              return true;
+            } else {
+              return false;
+            }
+          } else {
+            return false;
+          }
+        } else if (_source87.is_Div) {
+          return false;
+        } else if (_source87.is_EuclidianDiv) {
+          return false;
+        } else if (_source87.is_Mod) {
+          return false;
+        } else if (_source87.is_EuclidianMod) {
+          return false;
+        } else if (_source87.is_Lt) {
+          return false;
+        } else if (_source87.is_LtChar) {
+          return false;
+        } else if (_source87.is_Plus) {
+          return false;
+        } else if (_source87.is_Minus) {
+          return false;
+        } else if (_source87.is_Times) {
+          return false;
+        } else if (_source87.is_BitwiseAnd) {
+          return false;
+        } else if (_source87.is_BitwiseOr) {
+          return false;
+        } else if (_source87.is_BitwiseXor) {
+          return false;
+        } else if (_source87.is_BitwiseShiftRight) {
+          return false;
+        } else if (_source87.is_BitwiseShiftLeft) {
+          return false;
+        } else if (_source87.is_And) {
+          return false;
+        } else if (_source87.is_Or) {
+          return false;
+        } else if (_source87.is_In) {
+          return false;
+        } else if (_source87.is_SeqProperPrefix) {
+          return false;
+        } else if (_source87.is_SeqPrefix) {
+          return false;
+        } else if (_source87.is_SetMerge) {
+          return false;
+        } else if (_source87.is_SetSubtraction) {
+          return false;
+        } else if (_source87.is_SetIntersection) {
+          return false;
+        } else if (_source87.is_Subset) {
+          return false;
+        } else if (_source87.is_ProperSubset) {
+          return false;
+        } else if (_source87.is_SetDisjoint) {
+          return false;
+        } else if (_source87.is_MapMerge) {
+          return false;
+        } else if (_source87.is_MapSubtraction) {
+          return false;
+        } else if (_source87.is_MultisetMerge) {
+          return false;
+        } else if (_source87.is_MultisetSubtraction) {
+          return false;
+        } else if (_source87.is_MultisetIntersection) {
+          return false;
+        } else if (_source87.is_Submultiset) {
+          return false;
+        } else if (_source87.is_ProperSubmultiset) {
+          return false;
+        } else if (_source87.is_MultisetDisjoint) {
+          return false;
+        } else if (_source87.is_Concat) {
+          return false;
+        } else {
+          Dafny.ISequence<Dafny.Rune> _2533___mcc_h16 = _source87.dtor_Passthrough_a0;
+          return false;
+        }
+      }))(_2518_op);
+      DCOMP._IOwnership _2534_expectedLeftOwnership;
+      _2534_expectedLeftOwnership = ((_2522_becomesLeftCallsRight) ? (DCOMP.Ownership.create_OwnershipAutoBorrowed()) : ((((_2526_becomesRightCallsLeft) || (_2530_becomesCallLeftRight)) ? (DCOMP.Ownership.create_OwnershipBorrowed()) : (DCOMP.Ownership.create_OwnershipOwned()))));
+      DCOMP._IOwnership _2535_expectedRightOwnership;
+      _2535_expectedRightOwnership = (((_2522_becomesLeftCallsRight) || (_2530_becomesCallLeftRight)) ? (DCOMP.Ownership.create_OwnershipBorrowed()) : (((_2526_becomesRightCallsLeft) ? (DCOMP.Ownership.create_OwnershipAutoBorrowed()) : (DCOMP.Ownership.create_OwnershipOwned()))));
+      RAST._IExpr _2536_left;
+      DCOMP._IOwnership _2537___v57;
+      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2538_recIdentsL;
+      RAST._IExpr _out189;
+      DCOMP._IOwnership _out190;
+      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out191;
+      (this).GenExpr(_2519_lExpr, selfIdent, @params, _2534_expectedLeftOwnership, out _out189, out _out190, out _out191);
+      _2536_left = _out189;
+      _2537___v57 = _out190;
+      _2538_recIdentsL = _out191;
+      RAST._IExpr _2539_right;
+      DCOMP._IOwnership _2540___v58;
+      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2541_recIdentsR;
+      RAST._IExpr _out192;
+      DCOMP._IOwnership _out193;
+      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out194;
+      (this).GenExpr(_2520_rExpr, selfIdent, @params, _2535_expectedRightOwnership, out _out192, out _out193, out _out194);
+      _2539_right = _out192;
+      _2540___v58 = _out193;
+      _2541_recIdentsR = _out194;
+      DAST._IBinOp _source88 = _2518_op;
+      if (_source88.is_Eq) {
+        bool _2542___mcc_h18 = _source88.dtor_referential;
+        bool _2543___mcc_h19 = _source88.dtor_nullable;
+        {
+          if ((DCOMP.COMP.OpTable).Contains(_2518_op)) {
+            r = RAST.Expr.create_BinaryOp(Dafny.Map<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>.Select(DCOMP.COMP.OpTable,_2518_op), _2536_left, _2539_right, _2521_format);
+          } else {
+            DAST._IBinOp _source89 = _2518_op;
+            if (_source89.is_Eq) {
+              bool _2544___mcc_h24 = _source89.dtor_referential;
+              bool _2545___mcc_h25 = _source89.dtor_nullable;
+              bool _2546_nullable = _2545___mcc_h25;
+              bool _2547_referential = _2544___mcc_h24;
+              {
+                if (_2547_referential) {
+                  if (_2546_nullable) {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::nullable_referential_equality")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  } else {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::ptr_eq")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  }
+                } else {
+                  r = RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("=="), _2536_left, _2539_right, DAST.Format.BinaryOpFormat.create_NoFormat());
+                }
+              }
+            } else if (_source89.is_EuclidianDiv) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_division")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else if (_source89.is_EuclidianMod) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_modulo")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _2548___mcc_h26 = _source89.dtor_Passthrough_a0;
+              Dafny.ISequence<Dafny.Rune> _2549_op = _2548___mcc_h26;
+              {
+                r = RAST.Expr.create_BinaryOp(_2549_op, _2536_left, _2539_right, _2521_format);
+              }
+            }
+          }
+        }
+      } else if (_source88.is_Div) {
+        {
+          if ((DCOMP.COMP.OpTable).Contains(_2518_op)) {
+            r = RAST.Expr.create_BinaryOp(Dafny.Map<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>.Select(DCOMP.COMP.OpTable,_2518_op), _2536_left, _2539_right, _2521_format);
+          } else {
+            DAST._IBinOp _source90 = _2518_op;
+            if (_source90.is_Eq) {
+              bool _2550___mcc_h27 = _source90.dtor_referential;
+              bool _2551___mcc_h28 = _source90.dtor_nullable;
+              bool _2552_nullable = _2551___mcc_h28;
+              bool _2553_referential = _2550___mcc_h27;
+              {
+                if (_2553_referential) {
+                  if (_2552_nullable) {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::nullable_referential_equality")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  } else {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::ptr_eq")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  }
+                } else {
+                  r = RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("=="), _2536_left, _2539_right, DAST.Format.BinaryOpFormat.create_NoFormat());
+                }
+              }
+            } else if (_source90.is_EuclidianDiv) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_division")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else if (_source90.is_EuclidianMod) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_modulo")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _2554___mcc_h29 = _source90.dtor_Passthrough_a0;
+              Dafny.ISequence<Dafny.Rune> _2555_op = _2554___mcc_h29;
+              {
+                r = RAST.Expr.create_BinaryOp(_2555_op, _2536_left, _2539_right, _2521_format);
+              }
+            }
+          }
+        }
+      } else if (_source88.is_EuclidianDiv) {
+        {
+          if ((DCOMP.COMP.OpTable).Contains(_2518_op)) {
+            r = RAST.Expr.create_BinaryOp(Dafny.Map<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>.Select(DCOMP.COMP.OpTable,_2518_op), _2536_left, _2539_right, _2521_format);
+          } else {
+            DAST._IBinOp _source91 = _2518_op;
+            if (_source91.is_Eq) {
+              bool _2556___mcc_h30 = _source91.dtor_referential;
+              bool _2557___mcc_h31 = _source91.dtor_nullable;
+              bool _2558_nullable = _2557___mcc_h31;
+              bool _2559_referential = _2556___mcc_h30;
+              {
+                if (_2559_referential) {
+                  if (_2558_nullable) {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::nullable_referential_equality")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  } else {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::ptr_eq")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  }
+                } else {
+                  r = RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("=="), _2536_left, _2539_right, DAST.Format.BinaryOpFormat.create_NoFormat());
+                }
+              }
+            } else if (_source91.is_EuclidianDiv) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_division")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else if (_source91.is_EuclidianMod) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_modulo")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _2560___mcc_h32 = _source91.dtor_Passthrough_a0;
+              Dafny.ISequence<Dafny.Rune> _2561_op = _2560___mcc_h32;
+              {
+                r = RAST.Expr.create_BinaryOp(_2561_op, _2536_left, _2539_right, _2521_format);
+              }
+            }
+          }
+        }
+      } else if (_source88.is_Mod) {
+        {
+          if ((DCOMP.COMP.OpTable).Contains(_2518_op)) {
+            r = RAST.Expr.create_BinaryOp(Dafny.Map<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>.Select(DCOMP.COMP.OpTable,_2518_op), _2536_left, _2539_right, _2521_format);
+          } else {
+            DAST._IBinOp _source92 = _2518_op;
+            if (_source92.is_Eq) {
+              bool _2562___mcc_h33 = _source92.dtor_referential;
+              bool _2563___mcc_h34 = _source92.dtor_nullable;
+              bool _2564_nullable = _2563___mcc_h34;
+              bool _2565_referential = _2562___mcc_h33;
+              {
+                if (_2565_referential) {
+                  if (_2564_nullable) {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::nullable_referential_equality")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  } else {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::ptr_eq")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  }
+                } else {
+                  r = RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("=="), _2536_left, _2539_right, DAST.Format.BinaryOpFormat.create_NoFormat());
+                }
+              }
+            } else if (_source92.is_EuclidianDiv) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_division")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else if (_source92.is_EuclidianMod) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_modulo")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _2566___mcc_h35 = _source92.dtor_Passthrough_a0;
+              Dafny.ISequence<Dafny.Rune> _2567_op = _2566___mcc_h35;
+              {
+                r = RAST.Expr.create_BinaryOp(_2567_op, _2536_left, _2539_right, _2521_format);
+              }
+            }
+          }
+        }
+      } else if (_source88.is_EuclidianMod) {
+        {
+          if ((DCOMP.COMP.OpTable).Contains(_2518_op)) {
+            r = RAST.Expr.create_BinaryOp(Dafny.Map<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>.Select(DCOMP.COMP.OpTable,_2518_op), _2536_left, _2539_right, _2521_format);
+          } else {
+            DAST._IBinOp _source93 = _2518_op;
+            if (_source93.is_Eq) {
+              bool _2568___mcc_h36 = _source93.dtor_referential;
+              bool _2569___mcc_h37 = _source93.dtor_nullable;
+              bool _2570_nullable = _2569___mcc_h37;
+              bool _2571_referential = _2568___mcc_h36;
+              {
+                if (_2571_referential) {
+                  if (_2570_nullable) {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::nullable_referential_equality")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  } else {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::ptr_eq")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  }
+                } else {
+                  r = RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("=="), _2536_left, _2539_right, DAST.Format.BinaryOpFormat.create_NoFormat());
+                }
+              }
+            } else if (_source93.is_EuclidianDiv) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_division")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else if (_source93.is_EuclidianMod) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_modulo")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _2572___mcc_h38 = _source93.dtor_Passthrough_a0;
+              Dafny.ISequence<Dafny.Rune> _2573_op = _2572___mcc_h38;
+              {
+                r = RAST.Expr.create_BinaryOp(_2573_op, _2536_left, _2539_right, _2521_format);
+              }
+            }
+          }
+        }
+      } else if (_source88.is_Lt) {
+        {
+          if ((DCOMP.COMP.OpTable).Contains(_2518_op)) {
+            r = RAST.Expr.create_BinaryOp(Dafny.Map<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>.Select(DCOMP.COMP.OpTable,_2518_op), _2536_left, _2539_right, _2521_format);
+          } else {
+            DAST._IBinOp _source94 = _2518_op;
+            if (_source94.is_Eq) {
+              bool _2574___mcc_h39 = _source94.dtor_referential;
+              bool _2575___mcc_h40 = _source94.dtor_nullable;
+              bool _2576_nullable = _2575___mcc_h40;
+              bool _2577_referential = _2574___mcc_h39;
+              {
+                if (_2577_referential) {
+                  if (_2576_nullable) {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::nullable_referential_equality")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  } else {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::ptr_eq")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  }
+                } else {
+                  r = RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("=="), _2536_left, _2539_right, DAST.Format.BinaryOpFormat.create_NoFormat());
+                }
+              }
+            } else if (_source94.is_EuclidianDiv) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_division")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else if (_source94.is_EuclidianMod) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_modulo")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _2578___mcc_h41 = _source94.dtor_Passthrough_a0;
+              Dafny.ISequence<Dafny.Rune> _2579_op = _2578___mcc_h41;
+              {
+                r = RAST.Expr.create_BinaryOp(_2579_op, _2536_left, _2539_right, _2521_format);
+              }
+            }
+          }
+        }
+      } else if (_source88.is_LtChar) {
+        {
+          if ((DCOMP.COMP.OpTable).Contains(_2518_op)) {
+            r = RAST.Expr.create_BinaryOp(Dafny.Map<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>.Select(DCOMP.COMP.OpTable,_2518_op), _2536_left, _2539_right, _2521_format);
+          } else {
+            DAST._IBinOp _source95 = _2518_op;
+            if (_source95.is_Eq) {
+              bool _2580___mcc_h42 = _source95.dtor_referential;
+              bool _2581___mcc_h43 = _source95.dtor_nullable;
+              bool _2582_nullable = _2581___mcc_h43;
+              bool _2583_referential = _2580___mcc_h42;
+              {
+                if (_2583_referential) {
+                  if (_2582_nullable) {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::nullable_referential_equality")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  } else {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::ptr_eq")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  }
+                } else {
+                  r = RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("=="), _2536_left, _2539_right, DAST.Format.BinaryOpFormat.create_NoFormat());
+                }
+              }
+            } else if (_source95.is_EuclidianDiv) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_division")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else if (_source95.is_EuclidianMod) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_modulo")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _2584___mcc_h44 = _source95.dtor_Passthrough_a0;
+              Dafny.ISequence<Dafny.Rune> _2585_op = _2584___mcc_h44;
+              {
+                r = RAST.Expr.create_BinaryOp(_2585_op, _2536_left, _2539_right, _2521_format);
+              }
+            }
+          }
+        }
+      } else if (_source88.is_Plus) {
+        {
+          if ((DCOMP.COMP.OpTable).Contains(_2518_op)) {
+            r = RAST.Expr.create_BinaryOp(Dafny.Map<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>.Select(DCOMP.COMP.OpTable,_2518_op), _2536_left, _2539_right, _2521_format);
+          } else {
+            DAST._IBinOp _source96 = _2518_op;
+            if (_source96.is_Eq) {
+              bool _2586___mcc_h45 = _source96.dtor_referential;
+              bool _2587___mcc_h46 = _source96.dtor_nullable;
+              bool _2588_nullable = _2587___mcc_h46;
+              bool _2589_referential = _2586___mcc_h45;
+              {
+                if (_2589_referential) {
+                  if (_2588_nullable) {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::nullable_referential_equality")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  } else {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::ptr_eq")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  }
+                } else {
+                  r = RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("=="), _2536_left, _2539_right, DAST.Format.BinaryOpFormat.create_NoFormat());
+                }
+              }
+            } else if (_source96.is_EuclidianDiv) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_division")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else if (_source96.is_EuclidianMod) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_modulo")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _2590___mcc_h47 = _source96.dtor_Passthrough_a0;
+              Dafny.ISequence<Dafny.Rune> _2591_op = _2590___mcc_h47;
+              {
+                r = RAST.Expr.create_BinaryOp(_2591_op, _2536_left, _2539_right, _2521_format);
+              }
+            }
+          }
+        }
+      } else if (_source88.is_Minus) {
+        {
+          if ((DCOMP.COMP.OpTable).Contains(_2518_op)) {
+            r = RAST.Expr.create_BinaryOp(Dafny.Map<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>.Select(DCOMP.COMP.OpTable,_2518_op), _2536_left, _2539_right, _2521_format);
+          } else {
+            DAST._IBinOp _source97 = _2518_op;
+            if (_source97.is_Eq) {
+              bool _2592___mcc_h48 = _source97.dtor_referential;
+              bool _2593___mcc_h49 = _source97.dtor_nullable;
+              bool _2594_nullable = _2593___mcc_h49;
+              bool _2595_referential = _2592___mcc_h48;
+              {
+                if (_2595_referential) {
+                  if (_2594_nullable) {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::nullable_referential_equality")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  } else {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::ptr_eq")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  }
+                } else {
+                  r = RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("=="), _2536_left, _2539_right, DAST.Format.BinaryOpFormat.create_NoFormat());
+                }
+              }
+            } else if (_source97.is_EuclidianDiv) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_division")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else if (_source97.is_EuclidianMod) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_modulo")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _2596___mcc_h50 = _source97.dtor_Passthrough_a0;
+              Dafny.ISequence<Dafny.Rune> _2597_op = _2596___mcc_h50;
+              {
+                r = RAST.Expr.create_BinaryOp(_2597_op, _2536_left, _2539_right, _2521_format);
+              }
+            }
+          }
+        }
+      } else if (_source88.is_Times) {
+        {
+          if ((DCOMP.COMP.OpTable).Contains(_2518_op)) {
+            r = RAST.Expr.create_BinaryOp(Dafny.Map<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>.Select(DCOMP.COMP.OpTable,_2518_op), _2536_left, _2539_right, _2521_format);
+          } else {
+            DAST._IBinOp _source98 = _2518_op;
+            if (_source98.is_Eq) {
+              bool _2598___mcc_h51 = _source98.dtor_referential;
+              bool _2599___mcc_h52 = _source98.dtor_nullable;
+              bool _2600_nullable = _2599___mcc_h52;
+              bool _2601_referential = _2598___mcc_h51;
+              {
+                if (_2601_referential) {
+                  if (_2600_nullable) {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::nullable_referential_equality")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  } else {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::ptr_eq")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  }
+                } else {
+                  r = RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("=="), _2536_left, _2539_right, DAST.Format.BinaryOpFormat.create_NoFormat());
+                }
+              }
+            } else if (_source98.is_EuclidianDiv) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_division")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else if (_source98.is_EuclidianMod) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_modulo")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _2602___mcc_h53 = _source98.dtor_Passthrough_a0;
+              Dafny.ISequence<Dafny.Rune> _2603_op = _2602___mcc_h53;
+              {
+                r = RAST.Expr.create_BinaryOp(_2603_op, _2536_left, _2539_right, _2521_format);
+              }
+            }
+          }
+        }
+      } else if (_source88.is_BitwiseAnd) {
+        {
+          if ((DCOMP.COMP.OpTable).Contains(_2518_op)) {
+            r = RAST.Expr.create_BinaryOp(Dafny.Map<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>.Select(DCOMP.COMP.OpTable,_2518_op), _2536_left, _2539_right, _2521_format);
+          } else {
+            DAST._IBinOp _source99 = _2518_op;
+            if (_source99.is_Eq) {
+              bool _2604___mcc_h54 = _source99.dtor_referential;
+              bool _2605___mcc_h55 = _source99.dtor_nullable;
+              bool _2606_nullable = _2605___mcc_h55;
+              bool _2607_referential = _2604___mcc_h54;
+              {
+                if (_2607_referential) {
+                  if (_2606_nullable) {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::nullable_referential_equality")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  } else {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::ptr_eq")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  }
+                } else {
+                  r = RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("=="), _2536_left, _2539_right, DAST.Format.BinaryOpFormat.create_NoFormat());
+                }
+              }
+            } else if (_source99.is_EuclidianDiv) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_division")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else if (_source99.is_EuclidianMod) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_modulo")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _2608___mcc_h56 = _source99.dtor_Passthrough_a0;
+              Dafny.ISequence<Dafny.Rune> _2609_op = _2608___mcc_h56;
+              {
+                r = RAST.Expr.create_BinaryOp(_2609_op, _2536_left, _2539_right, _2521_format);
+              }
+            }
+          }
+        }
+      } else if (_source88.is_BitwiseOr) {
+        {
+          if ((DCOMP.COMP.OpTable).Contains(_2518_op)) {
+            r = RAST.Expr.create_BinaryOp(Dafny.Map<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>.Select(DCOMP.COMP.OpTable,_2518_op), _2536_left, _2539_right, _2521_format);
+          } else {
+            DAST._IBinOp _source100 = _2518_op;
+            if (_source100.is_Eq) {
+              bool _2610___mcc_h57 = _source100.dtor_referential;
+              bool _2611___mcc_h58 = _source100.dtor_nullable;
+              bool _2612_nullable = _2611___mcc_h58;
+              bool _2613_referential = _2610___mcc_h57;
+              {
+                if (_2613_referential) {
+                  if (_2612_nullable) {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::nullable_referential_equality")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  } else {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::ptr_eq")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  }
+                } else {
+                  r = RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("=="), _2536_left, _2539_right, DAST.Format.BinaryOpFormat.create_NoFormat());
+                }
+              }
+            } else if (_source100.is_EuclidianDiv) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_division")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else if (_source100.is_EuclidianMod) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_modulo")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _2614___mcc_h59 = _source100.dtor_Passthrough_a0;
+              Dafny.ISequence<Dafny.Rune> _2615_op = _2614___mcc_h59;
+              {
+                r = RAST.Expr.create_BinaryOp(_2615_op, _2536_left, _2539_right, _2521_format);
+              }
+            }
+          }
+        }
+      } else if (_source88.is_BitwiseXor) {
+        {
+          if ((DCOMP.COMP.OpTable).Contains(_2518_op)) {
+            r = RAST.Expr.create_BinaryOp(Dafny.Map<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>.Select(DCOMP.COMP.OpTable,_2518_op), _2536_left, _2539_right, _2521_format);
+          } else {
+            DAST._IBinOp _source101 = _2518_op;
+            if (_source101.is_Eq) {
+              bool _2616___mcc_h60 = _source101.dtor_referential;
+              bool _2617___mcc_h61 = _source101.dtor_nullable;
+              bool _2618_nullable = _2617___mcc_h61;
+              bool _2619_referential = _2616___mcc_h60;
+              {
+                if (_2619_referential) {
+                  if (_2618_nullable) {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::nullable_referential_equality")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  } else {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::ptr_eq")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  }
+                } else {
+                  r = RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("=="), _2536_left, _2539_right, DAST.Format.BinaryOpFormat.create_NoFormat());
+                }
+              }
+            } else if (_source101.is_EuclidianDiv) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_division")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else if (_source101.is_EuclidianMod) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_modulo")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _2620___mcc_h62 = _source101.dtor_Passthrough_a0;
+              Dafny.ISequence<Dafny.Rune> _2621_op = _2620___mcc_h62;
+              {
+                r = RAST.Expr.create_BinaryOp(_2621_op, _2536_left, _2539_right, _2521_format);
+              }
+            }
+          }
+        }
+      } else if (_source88.is_BitwiseShiftRight) {
+        {
+          if ((DCOMP.COMP.OpTable).Contains(_2518_op)) {
+            r = RAST.Expr.create_BinaryOp(Dafny.Map<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>.Select(DCOMP.COMP.OpTable,_2518_op), _2536_left, _2539_right, _2521_format);
+          } else {
+            DAST._IBinOp _source102 = _2518_op;
+            if (_source102.is_Eq) {
+              bool _2622___mcc_h63 = _source102.dtor_referential;
+              bool _2623___mcc_h64 = _source102.dtor_nullable;
+              bool _2624_nullable = _2623___mcc_h64;
+              bool _2625_referential = _2622___mcc_h63;
+              {
+                if (_2625_referential) {
+                  if (_2624_nullable) {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::nullable_referential_equality")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  } else {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::ptr_eq")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  }
+                } else {
+                  r = RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("=="), _2536_left, _2539_right, DAST.Format.BinaryOpFormat.create_NoFormat());
+                }
+              }
+            } else if (_source102.is_EuclidianDiv) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_division")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else if (_source102.is_EuclidianMod) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_modulo")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _2626___mcc_h65 = _source102.dtor_Passthrough_a0;
+              Dafny.ISequence<Dafny.Rune> _2627_op = _2626___mcc_h65;
+              {
+                r = RAST.Expr.create_BinaryOp(_2627_op, _2536_left, _2539_right, _2521_format);
+              }
+            }
+          }
+        }
+      } else if (_source88.is_BitwiseShiftLeft) {
+        {
+          if ((DCOMP.COMP.OpTable).Contains(_2518_op)) {
+            r = RAST.Expr.create_BinaryOp(Dafny.Map<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>.Select(DCOMP.COMP.OpTable,_2518_op), _2536_left, _2539_right, _2521_format);
+          } else {
+            DAST._IBinOp _source103 = _2518_op;
+            if (_source103.is_Eq) {
+              bool _2628___mcc_h66 = _source103.dtor_referential;
+              bool _2629___mcc_h67 = _source103.dtor_nullable;
+              bool _2630_nullable = _2629___mcc_h67;
+              bool _2631_referential = _2628___mcc_h66;
+              {
+                if (_2631_referential) {
+                  if (_2630_nullable) {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::nullable_referential_equality")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  } else {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::ptr_eq")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  }
+                } else {
+                  r = RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("=="), _2536_left, _2539_right, DAST.Format.BinaryOpFormat.create_NoFormat());
+                }
+              }
+            } else if (_source103.is_EuclidianDiv) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_division")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else if (_source103.is_EuclidianMod) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_modulo")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _2632___mcc_h68 = _source103.dtor_Passthrough_a0;
+              Dafny.ISequence<Dafny.Rune> _2633_op = _2632___mcc_h68;
+              {
+                r = RAST.Expr.create_BinaryOp(_2633_op, _2536_left, _2539_right, _2521_format);
+              }
+            }
+          }
+        }
+      } else if (_source88.is_And) {
+        {
+          if ((DCOMP.COMP.OpTable).Contains(_2518_op)) {
+            r = RAST.Expr.create_BinaryOp(Dafny.Map<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>.Select(DCOMP.COMP.OpTable,_2518_op), _2536_left, _2539_right, _2521_format);
+          } else {
+            DAST._IBinOp _source104 = _2518_op;
+            if (_source104.is_Eq) {
+              bool _2634___mcc_h69 = _source104.dtor_referential;
+              bool _2635___mcc_h70 = _source104.dtor_nullable;
+              bool _2636_nullable = _2635___mcc_h70;
+              bool _2637_referential = _2634___mcc_h69;
+              {
+                if (_2637_referential) {
+                  if (_2636_nullable) {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::nullable_referential_equality")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  } else {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::ptr_eq")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  }
+                } else {
+                  r = RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("=="), _2536_left, _2539_right, DAST.Format.BinaryOpFormat.create_NoFormat());
+                }
+              }
+            } else if (_source104.is_EuclidianDiv) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_division")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else if (_source104.is_EuclidianMod) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_modulo")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _2638___mcc_h71 = _source104.dtor_Passthrough_a0;
+              Dafny.ISequence<Dafny.Rune> _2639_op = _2638___mcc_h71;
+              {
+                r = RAST.Expr.create_BinaryOp(_2639_op, _2536_left, _2539_right, _2521_format);
+              }
+            }
+          }
+        }
+      } else if (_source88.is_Or) {
+        {
+          if ((DCOMP.COMP.OpTable).Contains(_2518_op)) {
+            r = RAST.Expr.create_BinaryOp(Dafny.Map<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>.Select(DCOMP.COMP.OpTable,_2518_op), _2536_left, _2539_right, _2521_format);
+          } else {
+            DAST._IBinOp _source105 = _2518_op;
+            if (_source105.is_Eq) {
+              bool _2640___mcc_h72 = _source105.dtor_referential;
+              bool _2641___mcc_h73 = _source105.dtor_nullable;
+              bool _2642_nullable = _2641___mcc_h73;
+              bool _2643_referential = _2640___mcc_h72;
+              {
+                if (_2643_referential) {
+                  if (_2642_nullable) {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::nullable_referential_equality")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  } else {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::ptr_eq")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  }
+                } else {
+                  r = RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("=="), _2536_left, _2539_right, DAST.Format.BinaryOpFormat.create_NoFormat());
+                }
+              }
+            } else if (_source105.is_EuclidianDiv) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_division")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else if (_source105.is_EuclidianMod) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_modulo")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _2644___mcc_h74 = _source105.dtor_Passthrough_a0;
+              Dafny.ISequence<Dafny.Rune> _2645_op = _2644___mcc_h74;
+              {
+                r = RAST.Expr.create_BinaryOp(_2645_op, _2536_left, _2539_right, _2521_format);
+              }
+            }
+          }
+        }
+      } else if (_source88.is_In) {
+        {
+          r = ((_2539_right).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("contains"))).Apply1(_2536_left);
+        }
+      } else if (_source88.is_SeqProperPrefix) {
+        r = RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _2536_left, _2539_right, _2521_format);
+      } else if (_source88.is_SeqPrefix) {
+        r = RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<="), _2536_left, _2539_right, _2521_format);
+      } else if (_source88.is_SetMerge) {
+        {
+          r = ((_2536_left).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("merge"))).Apply1(_2539_right);
+        }
+      } else if (_source88.is_SetSubtraction) {
+        {
+          r = ((_2536_left).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("subtract"))).Apply1(_2539_right);
+        }
+      } else if (_source88.is_SetIntersection) {
+        {
+          r = ((_2536_left).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("intersect"))).Apply1(_2539_right);
+        }
+      } else if (_source88.is_Subset) {
+        {
+          r = RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<="), _2536_left, _2539_right, _2521_format);
+        }
+      } else if (_source88.is_ProperSubset) {
+        {
+          r = RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _2536_left, _2539_right, _2521_format);
+        }
+      } else if (_source88.is_SetDisjoint) {
+        {
+          r = ((_2536_left).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("disjoint"))).Apply1(_2539_right);
+        }
+      } else if (_source88.is_MapMerge) {
+        {
+          r = ((_2536_left).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("merge"))).Apply1(_2539_right);
+        }
+      } else if (_source88.is_MapSubtraction) {
+        {
+          r = ((_2536_left).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("subtract"))).Apply1(_2539_right);
+        }
+      } else if (_source88.is_MultisetMerge) {
+        {
+          r = ((_2536_left).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("merge"))).Apply1(_2539_right);
+        }
+      } else if (_source88.is_MultisetSubtraction) {
+        {
+          r = ((_2536_left).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("subtract"))).Apply1(_2539_right);
+        }
+      } else if (_source88.is_MultisetIntersection) {
+        {
+          r = ((_2536_left).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("intersect"))).Apply1(_2539_right);
+        }
+      } else if (_source88.is_Submultiset) {
+        {
+          r = RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<="), _2536_left, _2539_right, _2521_format);
+        }
+      } else if (_source88.is_ProperSubmultiset) {
+        {
+          r = RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), _2536_left, _2539_right, _2521_format);
+        }
+      } else if (_source88.is_MultisetDisjoint) {
+        {
+          r = ((_2536_left).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("disjoint"))).Apply1(_2539_right);
+        }
+      } else if (_source88.is_Concat) {
+        {
+          r = ((_2536_left).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("concat"))).Apply1(_2539_right);
+        }
+      } else {
+        Dafny.ISequence<Dafny.Rune> _2646___mcc_h22 = _source88.dtor_Passthrough_a0;
+        {
+          if ((DCOMP.COMP.OpTable).Contains(_2518_op)) {
+            r = RAST.Expr.create_BinaryOp(Dafny.Map<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>.Select(DCOMP.COMP.OpTable,_2518_op), _2536_left, _2539_right, _2521_format);
+          } else {
+            DAST._IBinOp _source106 = _2518_op;
+            if (_source106.is_Eq) {
+              bool _2647___mcc_h75 = _source106.dtor_referential;
+              bool _2648___mcc_h76 = _source106.dtor_nullable;
+              bool _2649_nullable = _2648___mcc_h76;
+              bool _2650_referential = _2647___mcc_h75;
+              {
+                if (_2650_referential) {
+                  if (_2649_nullable) {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::nullable_referential_equality")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  } else {
+                    r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::ptr_eq")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+                  }
+                } else {
+                  r = RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("=="), _2536_left, _2539_right, DAST.Format.BinaryOpFormat.create_NoFormat());
+                }
+              }
+            } else if (_source106.is_EuclidianDiv) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_division")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else if (_source106.is_EuclidianMod) {
+              {
+                r = RAST.Expr.create_Call(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::euclidian_modulo")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_2536_left, _2539_right));
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _2651___mcc_h77 = _source106.dtor_Passthrough_a0;
+              Dafny.ISequence<Dafny.Rune> _2652_op = _2651___mcc_h77;
+              {
+                r = RAST.Expr.create_BinaryOp(_2652_op, _2536_left, _2539_right, _2521_format);
+              }
+            }
+          }
+        }
+      }
+      RAST._IExpr _out195;
+      DCOMP._IOwnership _out196;
+      DCOMP.COMP.FromOwned(r, expectedOwnership, out _out195, out _out196);
+      r = _out195;
+      resultingOwnership = _out196;
+      readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(_2538_recIdentsL, _2541_recIdentsR);
+      return ;
+    }
+    public void GenExprConvertFromNullable(DAST._IExpression e, Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> selfIdent, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> @params, DCOMP._IOwnership expectedOwnership, out RAST._IExpr r, out DCOMP._IOwnership resultingOwnership, out Dafny.ISet<Dafny.ISequence<Dafny.Rune>> readIdents)
+    {
+      r = RAST.Expr.Default();
+      resultingOwnership = DCOMP.Ownership.Default();
+      readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Empty;
+      DAST._IExpression _let_tmp_rhs50 = e;
+      DAST._IExpression _2653_expr = _let_tmp_rhs50.dtor_value;
+      DAST._IType _2654_fromTpe = _let_tmp_rhs50.dtor_from;
+      DAST._IType _2655_toTpe = _let_tmp_rhs50.dtor_typ;
+      RAST._IExpr _2656_recursiveGen;
+      DCOMP._IOwnership _2657_recOwned;
+      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2658_recIdents;
+      RAST._IExpr _out197;
+      DCOMP._IOwnership _out198;
+      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out199;
+      (this).GenExpr(_2653_expr, selfIdent, @params, expectedOwnership, out _out197, out _out198, out _out199);
+      _2656_recursiveGen = _out197;
+      _2657_recOwned = _out198;
+      _2658_recIdents = _out199;
+      r = _2656_recursiveGen;
+      if (object.Equals(_2657_recOwned, DCOMP.Ownership.create_OwnershipOwned())) {
+        r = ((r).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("as_ref"))).Apply(Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+      }
+      r = ((r).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("unwrap"))).Apply(Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+      RAST._IExpr _out200;
+      DCOMP._IOwnership _out201;
+      DCOMP.COMP.FromOwnership(r, _2657_recOwned, expectedOwnership, out _out200, out _out201);
+      r = _out200;
+      resultingOwnership = _out201;
+      readIdents = _2658_recIdents;
+    }
+    public void GenExprConvertToNullable(DAST._IExpression e, Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> selfIdent, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> @params, DCOMP._IOwnership expectedOwnership, out RAST._IExpr r, out DCOMP._IOwnership resultingOwnership, out Dafny.ISet<Dafny.ISequence<Dafny.Rune>> readIdents)
+    {
+      r = RAST.Expr.Default();
+      resultingOwnership = DCOMP.Ownership.Default();
+      readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Empty;
+      DAST._IExpression _let_tmp_rhs51 = e;
+      DAST._IExpression _2659_expr = _let_tmp_rhs51.dtor_value;
+      DAST._IType _2660_fromTpe = _let_tmp_rhs51.dtor_from;
+      DAST._IType _2661_toTpe = _let_tmp_rhs51.dtor_typ;
+      RAST._IExpr _2662_recursiveGen;
+      DCOMP._IOwnership _2663_recOwned;
+      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2664_recIdents;
+      RAST._IExpr _out202;
+      DCOMP._IOwnership _out203;
+      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out204;
+      (this).GenExpr(_2659_expr, selfIdent, @params, expectedOwnership, out _out202, out _out203, out _out204);
+      _2662_recursiveGen = _out202;
+      _2663_recOwned = _out203;
+      _2664_recIdents = _out204;
+      r = _2662_recursiveGen;
+      if (object.Equals(_2663_recOwned, DCOMP.Ownership.create_OwnershipOwned())) {
+        r = ((r).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("clone"))).Apply(Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+      }
+      r = ((((RAST.__default.std).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("option"))).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Option"))).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Some"))).Apply(Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(r));
+      RAST._IExpr _out205;
+      DCOMP._IOwnership _out206;
+      DCOMP.COMP.FromOwnership(r, _2663_recOwned, expectedOwnership, out _out205, out _out206);
+      r = _out205;
+      resultingOwnership = _out206;
+      readIdents = _2664_recIdents;
+    }
+    public void GenExprConvertToNewtype(DAST._IExpression e, Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> selfIdent, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> @params, DCOMP._IOwnership expectedOwnership, out RAST._IExpr r, out DCOMP._IOwnership resultingOwnership, out Dafny.ISet<Dafny.ISequence<Dafny.Rune>> readIdents)
+    {
+      r = RAST.Expr.Default();
+      resultingOwnership = DCOMP.Ownership.Default();
+      readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Empty;
+      DAST._IExpression _let_tmp_rhs52 = e;
+      DAST._IExpression _2665_expr = _let_tmp_rhs52.dtor_value;
+      DAST._IType _2666_fromTpe = _let_tmp_rhs52.dtor_from;
+      DAST._IType _2667_toTpe = _let_tmp_rhs52.dtor_typ;
+      DAST._IType _let_tmp_rhs53 = _2667_toTpe;
+      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2668___v60 = _let_tmp_rhs53.dtor_Path_a0;
+      Dafny.ISequence<DAST._IType> _2669___v61 = _let_tmp_rhs53.dtor_typeArgs;
+      DAST._IResolvedType _let_tmp_rhs54 = _let_tmp_rhs53.dtor_resolved;
+      DAST._IType _2670_b = _let_tmp_rhs54.dtor_baseType;
+      DAST._INewtypeRange _2671_range = _let_tmp_rhs54.dtor_range;
+      bool _2672_erase = _let_tmp_rhs54.dtor_erase;
+      if (object.Equals(_2666_fromTpe, _2670_b)) {
+        RAST._IExpr _2673_recursiveGen;
+        DCOMP._IOwnership _2674_recOwned;
+        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2675_recIdents;
+        RAST._IExpr _out207;
+        DCOMP._IOwnership _out208;
+        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out209;
+        (this).GenExpr(_2665_expr, selfIdent, @params, expectedOwnership, out _out207, out _out208, out _out209);
+        _2673_recursiveGen = _out207;
+        _2674_recOwned = _out208;
+        _2675_recIdents = _out209;
+        Std.Wrappers._IOption<RAST._IType> _2676_potentialRhsType;
+        _2676_potentialRhsType = DCOMP.COMP.NewtypeToRustType(_2670_b, _2671_range);
+        Std.Wrappers._IOption<RAST._IType> _source107 = _2676_potentialRhsType;
+        if (_source107.is_None) {
+          if (_2672_erase) {
+            r = _2673_recursiveGen;
+          } else {
+            RAST._IType _2677_rhsType;
+            RAST._IType _out210;
+            _out210 = (this).GenType(_2667_toTpe, true, false);
+            _2677_rhsType = _out210;
+            r = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat((_2677_rhsType)._ToString(DCOMP.__default.IND), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), (_2673_recursiveGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")));
+          }
+          RAST._IExpr _out211;
+          DCOMP._IOwnership _out212;
+          DCOMP.COMP.FromOwnership(r, _2674_recOwned, expectedOwnership, out _out211, out _out212);
+          r = _out211;
+          resultingOwnership = _out212;
+        } else {
+          RAST._IType _2678___mcc_h0 = _source107.dtor_value;
+          RAST._IType _2679_v = _2678___mcc_h0;
+          r = RAST.Expr.create_ConversionNum(_2679_v, _2673_recursiveGen);
+          RAST._IExpr _out213;
+          DCOMP._IOwnership _out214;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out213, out _out214);
+          r = _out213;
+          resultingOwnership = _out214;
+        }
+        readIdents = _2675_recIdents;
+      } else {
+        RAST._IExpr _out215;
+        DCOMP._IOwnership _out216;
+        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out217;
+        (this).GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_2665_expr, _2666_fromTpe, _2670_b), _2670_b, _2667_toTpe), selfIdent, @params, expectedOwnership, out _out215, out _out216, out _out217);
+        r = _out215;
+        resultingOwnership = _out216;
+        readIdents = _out217;
+      }
+    }
+    public void GenExprConvertFromNewtype(DAST._IExpression e, Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> selfIdent, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> @params, DCOMP._IOwnership expectedOwnership, out RAST._IExpr r, out DCOMP._IOwnership resultingOwnership, out Dafny.ISet<Dafny.ISequence<Dafny.Rune>> readIdents)
+    {
+      r = RAST.Expr.Default();
+      resultingOwnership = DCOMP.Ownership.Default();
+      readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Empty;
+      DAST._IExpression _let_tmp_rhs55 = e;
+      DAST._IExpression _2680_expr = _let_tmp_rhs55.dtor_value;
+      DAST._IType _2681_fromTpe = _let_tmp_rhs55.dtor_from;
+      DAST._IType _2682_toTpe = _let_tmp_rhs55.dtor_typ;
+      DAST._IType _let_tmp_rhs56 = _2681_fromTpe;
+      Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2683___v62 = _let_tmp_rhs56.dtor_Path_a0;
+      Dafny.ISequence<DAST._IType> _2684___v63 = _let_tmp_rhs56.dtor_typeArgs;
+      DAST._IResolvedType _let_tmp_rhs57 = _let_tmp_rhs56.dtor_resolved;
+      DAST._IType _2685_b = _let_tmp_rhs57.dtor_baseType;
+      DAST._INewtypeRange _2686_range = _let_tmp_rhs57.dtor_range;
+      bool _2687_erase = _let_tmp_rhs57.dtor_erase;
+      if (object.Equals(_2685_b, _2682_toTpe)) {
+        RAST._IExpr _2688_recursiveGen;
+        DCOMP._IOwnership _2689_recOwned;
+        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2690_recIdents;
+        RAST._IExpr _out218;
+        DCOMP._IOwnership _out219;
+        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out220;
+        (this).GenExpr(_2680_expr, selfIdent, @params, expectedOwnership, out _out218, out _out219, out _out220);
+        _2688_recursiveGen = _out218;
+        _2689_recOwned = _out219;
+        _2690_recIdents = _out220;
+        if (_2687_erase) {
+          r = _2688_recursiveGen;
+        } else {
+          r = (_2688_recursiveGen).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("0"));
+        }
+        RAST._IExpr _out221;
+        DCOMP._IOwnership _out222;
+        DCOMP.COMP.FromOwnership(r, _2689_recOwned, expectedOwnership, out _out221, out _out222);
+        r = _out221;
+        resultingOwnership = _out222;
+        readIdents = _2690_recIdents;
+      } else {
+        RAST._IExpr _out223;
+        DCOMP._IOwnership _out224;
+        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out225;
+        (this).GenExpr(DAST.Expression.create_Convert(DAST.Expression.create_Convert(_2680_expr, _2681_fromTpe, _2685_b), _2685_b, _2682_toTpe), selfIdent, @params, expectedOwnership, out _out223, out _out224, out _out225);
+        r = _out223;
+        resultingOwnership = _out224;
+        readIdents = _out225;
+      }
+    }
+    public void GenExprConvertNotImplemented(DAST._IExpression e, Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> selfIdent, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> @params, DCOMP._IOwnership expectedOwnership, out RAST._IExpr r, out DCOMP._IOwnership resultingOwnership, out Dafny.ISet<Dafny.ISequence<Dafny.Rune>> readIdents)
+    {
+      r = RAST.Expr.Default();
+      resultingOwnership = DCOMP.Ownership.Default();
+      readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Empty;
+      DAST._IExpression _let_tmp_rhs58 = e;
+      DAST._IExpression _2691_expr = _let_tmp_rhs58.dtor_value;
+      DAST._IType _2692_fromTpe = _let_tmp_rhs58.dtor_from;
+      DAST._IType _2693_toTpe = _let_tmp_rhs58.dtor_typ;
+      RAST._IExpr _2694_recursiveGen;
+      DCOMP._IOwnership _2695_recOwned;
+      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2696_recIdents;
+      RAST._IExpr _out226;
+      DCOMP._IOwnership _out227;
+      Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out228;
+      (this).GenExpr(_2691_expr, selfIdent, @params, expectedOwnership, out _out226, out _out227, out _out228);
+      _2694_recursiveGen = _out226;
+      _2695_recOwned = _out227;
+      _2696_recIdents = _out228;
+      r = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), (_2694_recursiveGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/* conversion not yet implemented */)")));
+      RAST._IExpr _out229;
+      DCOMP._IOwnership _out230;
+      DCOMP.COMP.FromOwned(r, expectedOwnership, out _out229, out _out230);
+      r = _out229;
+      resultingOwnership = _out230;
+      readIdents = _2696_recIdents;
+    }
+    public void GenExprConvert(DAST._IExpression e, Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> selfIdent, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> @params, DCOMP._IOwnership expectedOwnership, out RAST._IExpr r, out DCOMP._IOwnership resultingOwnership, out Dafny.ISet<Dafny.ISequence<Dafny.Rune>> readIdents)
+    {
+      r = RAST.Expr.Default();
+      resultingOwnership = DCOMP.Ownership.Default();
+      readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Empty;
+      DAST._IExpression _let_tmp_rhs59 = e;
+      DAST._IExpression _2697_expr = _let_tmp_rhs59.dtor_value;
+      DAST._IType _2698_fromTpe = _let_tmp_rhs59.dtor_from;
+      DAST._IType _2699_toTpe = _let_tmp_rhs59.dtor_typ;
+      if (object.Equals(_2698_fromTpe, _2699_toTpe)) {
+        RAST._IExpr _2700_recursiveGen;
+        DCOMP._IOwnership _2701_recOwned;
+        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _2702_recIdents;
+        RAST._IExpr _out231;
+        DCOMP._IOwnership _out232;
+        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out233;
+        (this).GenExpr(_2697_expr, selfIdent, @params, expectedOwnership, out _out231, out _out232, out _out233);
+        _2700_recursiveGen = _out231;
+        _2701_recOwned = _out232;
+        _2702_recIdents = _out233;
+        r = _2700_recursiveGen;
+        RAST._IExpr _out234;
+        DCOMP._IOwnership _out235;
+        DCOMP.COMP.FromOwnership(r, _2701_recOwned, expectedOwnership, out _out234, out _out235);
+        r = _out234;
+        resultingOwnership = _out235;
+        readIdents = _2702_recIdents;
+      } else {
+        _System._ITuple2<DAST._IType, DAST._IType> _source108 = _System.Tuple2<DAST._IType, DAST._IType>.create(_2698_fromTpe, _2699_toTpe);
+        DAST._IType _2703___mcc_h0 = _source108.dtor__0;
+        DAST._IType _2704___mcc_h1 = _source108.dtor__1;
+        DAST._IType _source109 = _2703___mcc_h0;
+        if (_source109.is_Path) {
+          Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2705___mcc_h4 = _source109.dtor_Path_a0;
+          Dafny.ISequence<DAST._IType> _2706___mcc_h5 = _source109.dtor_typeArgs;
+          DAST._IResolvedType _2707___mcc_h6 = _source109.dtor_resolved;
+          DAST._IResolvedType _source110 = _2707___mcc_h6;
+          if (_source110.is_Datatype) {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2708___mcc_h16 = _source110.dtor_path;
+            DAST._IType _source111 = _2704___mcc_h1;
+            if (_source111.is_Path) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2709___mcc_h20 = _source111.dtor_Path_a0;
+              Dafny.ISequence<DAST._IType> _2710___mcc_h21 = _source111.dtor_typeArgs;
+              DAST._IResolvedType _2711___mcc_h22 = _source111.dtor_resolved;
+              DAST._IResolvedType _source112 = _2711___mcc_h22;
+              if (_source112.is_Datatype) {
+                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2712___mcc_h26 = _source112.dtor_path;
+                {
+                  RAST._IExpr _out236;
+                  DCOMP._IOwnership _out237;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out238;
+                  (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out236, out _out237, out _out238);
+                  r = _out236;
+                  resultingOwnership = _out237;
+                  readIdents = _out238;
+                }
+              } else if (_source112.is_Trait) {
+                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2713___mcc_h28 = _source112.dtor_path;
+                {
+                  RAST._IExpr _out239;
+                  DCOMP._IOwnership _out240;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out241;
+                  (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out239, out _out240, out _out241);
+                  r = _out239;
+                  resultingOwnership = _out240;
+                  readIdents = _out241;
+                }
+              } else {
+                DAST._IType _2714___mcc_h30 = _source112.dtor_baseType;
+                DAST._INewtypeRange _2715___mcc_h31 = _source112.dtor_range;
+                bool _2716___mcc_h32 = _source112.dtor_erase;
+                bool _2717_erase = _2716___mcc_h32;
+                DAST._INewtypeRange _2718_range = _2715___mcc_h31;
+                DAST._IType _2719_b = _2714___mcc_h30;
+                {
+                  RAST._IExpr _out242;
+                  DCOMP._IOwnership _out243;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out244;
+                  (this).GenExprConvertToNewtype(e, selfIdent, @params, expectedOwnership, out _out242, out _out243, out _out244);
+                  r = _out242;
+                  resultingOwnership = _out243;
+                  readIdents = _out244;
+                }
+              }
+            } else if (_source111.is_Nullable) {
+              DAST._IType _2720___mcc_h36 = _source111.dtor_Nullable_a0;
+              {
+                RAST._IExpr _out245;
+                DCOMP._IOwnership _out246;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out247;
+                (this).GenExprConvertToNullable(e, selfIdent, @params, expectedOwnership, out _out245, out _out246, out _out247);
+                r = _out245;
+                resultingOwnership = _out246;
+                readIdents = _out247;
+              }
+            } else if (_source111.is_Tuple) {
+              Dafny.ISequence<DAST._IType> _2721___mcc_h38 = _source111.dtor_Tuple_a0;
+              {
+                RAST._IExpr _out248;
+                DCOMP._IOwnership _out249;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out250;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out248, out _out249, out _out250);
+                r = _out248;
+                resultingOwnership = _out249;
+                readIdents = _out250;
+              }
+            } else if (_source111.is_Array) {
+              DAST._IType _2722___mcc_h40 = _source111.dtor_element;
+              BigInteger _2723___mcc_h41 = _source111.dtor_dims;
+              {
+                RAST._IExpr _out251;
+                DCOMP._IOwnership _out252;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out253;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out251, out _out252, out _out253);
+                r = _out251;
+                resultingOwnership = _out252;
+                readIdents = _out253;
+              }
+            } else if (_source111.is_Seq) {
+              DAST._IType _2724___mcc_h44 = _source111.dtor_element;
+              {
+                RAST._IExpr _out254;
+                DCOMP._IOwnership _out255;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out256;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out254, out _out255, out _out256);
+                r = _out254;
+                resultingOwnership = _out255;
+                readIdents = _out256;
+              }
+            } else if (_source111.is_Set) {
+              DAST._IType _2725___mcc_h46 = _source111.dtor_element;
+              {
+                RAST._IExpr _out257;
+                DCOMP._IOwnership _out258;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out259;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out257, out _out258, out _out259);
+                r = _out257;
+                resultingOwnership = _out258;
+                readIdents = _out259;
+              }
+            } else if (_source111.is_Multiset) {
+              DAST._IType _2726___mcc_h48 = _source111.dtor_element;
+              {
+                RAST._IExpr _out260;
+                DCOMP._IOwnership _out261;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out262;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out260, out _out261, out _out262);
+                r = _out260;
+                resultingOwnership = _out261;
+                readIdents = _out262;
+              }
+            } else if (_source111.is_Map) {
+              DAST._IType _2727___mcc_h50 = _source111.dtor_key;
+              DAST._IType _2728___mcc_h51 = _source111.dtor_value;
+              {
+                RAST._IExpr _out263;
+                DCOMP._IOwnership _out264;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out265;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out263, out _out264, out _out265);
+                r = _out263;
+                resultingOwnership = _out264;
+                readIdents = _out265;
+              }
+            } else if (_source111.is_SetBuilder) {
+              DAST._IType _2729___mcc_h54 = _source111.dtor_element;
+              {
+                RAST._IExpr _out266;
+                DCOMP._IOwnership _out267;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out268;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out266, out _out267, out _out268);
+                r = _out266;
+                resultingOwnership = _out267;
+                readIdents = _out268;
+              }
+            } else if (_source111.is_MapBuilder) {
+              DAST._IType _2730___mcc_h56 = _source111.dtor_key;
+              DAST._IType _2731___mcc_h57 = _source111.dtor_value;
+              {
+                RAST._IExpr _out269;
+                DCOMP._IOwnership _out270;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out271;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out269, out _out270, out _out271);
+                r = _out269;
+                resultingOwnership = _out270;
+                readIdents = _out271;
+              }
+            } else if (_source111.is_Arrow) {
+              Dafny.ISequence<DAST._IType> _2732___mcc_h60 = _source111.dtor_args;
+              DAST._IType _2733___mcc_h61 = _source111.dtor_result;
+              {
+                RAST._IExpr _out272;
+                DCOMP._IOwnership _out273;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out274;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out272, out _out273, out _out274);
+                r = _out272;
+                resultingOwnership = _out273;
+                readIdents = _out274;
+              }
+            } else if (_source111.is_Primitive) {
+              DAST._IPrimitive _2734___mcc_h64 = _source111.dtor_Primitive_a0;
+              {
+                RAST._IExpr _out275;
+                DCOMP._IOwnership _out276;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out277;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out275, out _out276, out _out277);
+                r = _out275;
+                resultingOwnership = _out276;
+                readIdents = _out277;
+              }
+            } else if (_source111.is_Passthrough) {
+              Dafny.ISequence<Dafny.Rune> _2735___mcc_h66 = _source111.dtor_Passthrough_a0;
+              {
+                RAST._IExpr _out278;
+                DCOMP._IOwnership _out279;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out280;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out278, out _out279, out _out280);
+                r = _out278;
+                resultingOwnership = _out279;
+                readIdents = _out280;
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _2736___mcc_h68 = _source111.dtor_TypeArg_a0;
+              {
+                RAST._IExpr _out281;
+                DCOMP._IOwnership _out282;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out283;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out281, out _out282, out _out283);
+                r = _out281;
+                resultingOwnership = _out282;
+                readIdents = _out283;
+              }
+            }
+          } else if (_source110.is_Trait) {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2737___mcc_h70 = _source110.dtor_path;
+            DAST._IType _source113 = _2704___mcc_h1;
+            if (_source113.is_Path) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2738___mcc_h74 = _source113.dtor_Path_a0;
+              Dafny.ISequence<DAST._IType> _2739___mcc_h75 = _source113.dtor_typeArgs;
+              DAST._IResolvedType _2740___mcc_h76 = _source113.dtor_resolved;
+              DAST._IResolvedType _source114 = _2740___mcc_h76;
+              if (_source114.is_Datatype) {
+                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2741___mcc_h80 = _source114.dtor_path;
+                {
+                  RAST._IExpr _out284;
+                  DCOMP._IOwnership _out285;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out286;
+                  (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out284, out _out285, out _out286);
+                  r = _out284;
+                  resultingOwnership = _out285;
+                  readIdents = _out286;
+                }
+              } else if (_source114.is_Trait) {
+                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2742___mcc_h82 = _source114.dtor_path;
+                {
+                  RAST._IExpr _out287;
+                  DCOMP._IOwnership _out288;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out289;
+                  (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out287, out _out288, out _out289);
+                  r = _out287;
+                  resultingOwnership = _out288;
+                  readIdents = _out289;
+                }
+              } else {
+                DAST._IType _2743___mcc_h84 = _source114.dtor_baseType;
+                DAST._INewtypeRange _2744___mcc_h85 = _source114.dtor_range;
+                bool _2745___mcc_h86 = _source114.dtor_erase;
+                bool _2746_erase = _2745___mcc_h86;
+                DAST._INewtypeRange _2747_range = _2744___mcc_h85;
+                DAST._IType _2748_b = _2743___mcc_h84;
+                {
+                  RAST._IExpr _out290;
+                  DCOMP._IOwnership _out291;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out292;
+                  (this).GenExprConvertToNewtype(e, selfIdent, @params, expectedOwnership, out _out290, out _out291, out _out292);
+                  r = _out290;
+                  resultingOwnership = _out291;
+                  readIdents = _out292;
+                }
+              }
+            } else if (_source113.is_Nullable) {
+              DAST._IType _2749___mcc_h90 = _source113.dtor_Nullable_a0;
+              {
+                RAST._IExpr _out293;
+                DCOMP._IOwnership _out294;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out295;
+                (this).GenExprConvertToNullable(e, selfIdent, @params, expectedOwnership, out _out293, out _out294, out _out295);
+                r = _out293;
+                resultingOwnership = _out294;
+                readIdents = _out295;
+              }
+            } else if (_source113.is_Tuple) {
+              Dafny.ISequence<DAST._IType> _2750___mcc_h92 = _source113.dtor_Tuple_a0;
+              {
+                RAST._IExpr _out296;
+                DCOMP._IOwnership _out297;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out298;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out296, out _out297, out _out298);
+                r = _out296;
+                resultingOwnership = _out297;
+                readIdents = _out298;
+              }
+            } else if (_source113.is_Array) {
+              DAST._IType _2751___mcc_h94 = _source113.dtor_element;
+              BigInteger _2752___mcc_h95 = _source113.dtor_dims;
+              {
+                RAST._IExpr _out299;
+                DCOMP._IOwnership _out300;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out301;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out299, out _out300, out _out301);
+                r = _out299;
+                resultingOwnership = _out300;
+                readIdents = _out301;
+              }
+            } else if (_source113.is_Seq) {
+              DAST._IType _2753___mcc_h98 = _source113.dtor_element;
+              {
+                RAST._IExpr _out302;
+                DCOMP._IOwnership _out303;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out304;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out302, out _out303, out _out304);
+                r = _out302;
+                resultingOwnership = _out303;
+                readIdents = _out304;
+              }
+            } else if (_source113.is_Set) {
+              DAST._IType _2754___mcc_h100 = _source113.dtor_element;
+              {
+                RAST._IExpr _out305;
+                DCOMP._IOwnership _out306;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out307;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out305, out _out306, out _out307);
+                r = _out305;
+                resultingOwnership = _out306;
+                readIdents = _out307;
+              }
+            } else if (_source113.is_Multiset) {
+              DAST._IType _2755___mcc_h102 = _source113.dtor_element;
+              {
+                RAST._IExpr _out308;
+                DCOMP._IOwnership _out309;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out310;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out308, out _out309, out _out310);
+                r = _out308;
+                resultingOwnership = _out309;
+                readIdents = _out310;
+              }
+            } else if (_source113.is_Map) {
+              DAST._IType _2756___mcc_h104 = _source113.dtor_key;
+              DAST._IType _2757___mcc_h105 = _source113.dtor_value;
+              {
+                RAST._IExpr _out311;
+                DCOMP._IOwnership _out312;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out313;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out311, out _out312, out _out313);
+                r = _out311;
+                resultingOwnership = _out312;
+                readIdents = _out313;
+              }
+            } else if (_source113.is_SetBuilder) {
+              DAST._IType _2758___mcc_h108 = _source113.dtor_element;
+              {
+                RAST._IExpr _out314;
+                DCOMP._IOwnership _out315;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out316;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out314, out _out315, out _out316);
+                r = _out314;
+                resultingOwnership = _out315;
+                readIdents = _out316;
+              }
+            } else if (_source113.is_MapBuilder) {
+              DAST._IType _2759___mcc_h110 = _source113.dtor_key;
+              DAST._IType _2760___mcc_h111 = _source113.dtor_value;
+              {
+                RAST._IExpr _out317;
+                DCOMP._IOwnership _out318;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out319;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out317, out _out318, out _out319);
+                r = _out317;
+                resultingOwnership = _out318;
+                readIdents = _out319;
+              }
+            } else if (_source113.is_Arrow) {
+              Dafny.ISequence<DAST._IType> _2761___mcc_h114 = _source113.dtor_args;
+              DAST._IType _2762___mcc_h115 = _source113.dtor_result;
+              {
+                RAST._IExpr _out320;
+                DCOMP._IOwnership _out321;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out322;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out320, out _out321, out _out322);
+                r = _out320;
+                resultingOwnership = _out321;
+                readIdents = _out322;
+              }
+            } else if (_source113.is_Primitive) {
+              DAST._IPrimitive _2763___mcc_h118 = _source113.dtor_Primitive_a0;
+              {
+                RAST._IExpr _out323;
+                DCOMP._IOwnership _out324;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out325;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out323, out _out324, out _out325);
+                r = _out323;
+                resultingOwnership = _out324;
+                readIdents = _out325;
+              }
+            } else if (_source113.is_Passthrough) {
+              Dafny.ISequence<Dafny.Rune> _2764___mcc_h120 = _source113.dtor_Passthrough_a0;
+              {
+                RAST._IExpr _out326;
+                DCOMP._IOwnership _out327;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out328;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out326, out _out327, out _out328);
+                r = _out326;
+                resultingOwnership = _out327;
+                readIdents = _out328;
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _2765___mcc_h122 = _source113.dtor_TypeArg_a0;
+              {
+                RAST._IExpr _out329;
+                DCOMP._IOwnership _out330;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out331;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out329, out _out330, out _out331);
+                r = _out329;
+                resultingOwnership = _out330;
+                readIdents = _out331;
+              }
+            }
+          } else {
+            DAST._IType _2766___mcc_h124 = _source110.dtor_baseType;
+            DAST._INewtypeRange _2767___mcc_h125 = _source110.dtor_range;
+            bool _2768___mcc_h126 = _source110.dtor_erase;
+            DAST._IType _source115 = _2704___mcc_h1;
+            if (_source115.is_Path) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2769___mcc_h136 = _source115.dtor_Path_a0;
+              Dafny.ISequence<DAST._IType> _2770___mcc_h137 = _source115.dtor_typeArgs;
+              DAST._IResolvedType _2771___mcc_h138 = _source115.dtor_resolved;
+              DAST._IResolvedType _source116 = _2771___mcc_h138;
+              if (_source116.is_Datatype) {
+                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2772___mcc_h145 = _source116.dtor_path;
+                bool _2773_erase = _2768___mcc_h126;
+                DAST._INewtypeRange _2774_range = _2767___mcc_h125;
+                DAST._IType _2775_b = _2766___mcc_h124;
+                {
+                  RAST._IExpr _out332;
+                  DCOMP._IOwnership _out333;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out334;
+                  (this).GenExprConvertFromNewtype(e, selfIdent, @params, expectedOwnership, out _out332, out _out333, out _out334);
+                  r = _out332;
+                  resultingOwnership = _out333;
+                  readIdents = _out334;
+                }
+              } else if (_source116.is_Trait) {
+                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2776___mcc_h148 = _source116.dtor_path;
+                bool _2777_erase = _2768___mcc_h126;
+                DAST._INewtypeRange _2778_range = _2767___mcc_h125;
+                DAST._IType _2779_b = _2766___mcc_h124;
+                {
+                  RAST._IExpr _out335;
+                  DCOMP._IOwnership _out336;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out337;
+                  (this).GenExprConvertFromNewtype(e, selfIdent, @params, expectedOwnership, out _out335, out _out336, out _out337);
+                  r = _out335;
+                  resultingOwnership = _out336;
+                  readIdents = _out337;
+                }
+              } else {
+                DAST._IType _2780___mcc_h151 = _source116.dtor_baseType;
+                DAST._INewtypeRange _2781___mcc_h152 = _source116.dtor_range;
+                bool _2782___mcc_h153 = _source116.dtor_erase;
+                bool _2783_erase = _2782___mcc_h153;
+                DAST._INewtypeRange _2784_range = _2781___mcc_h152;
+                DAST._IType _2785_b = _2780___mcc_h151;
+                {
+                  RAST._IExpr _out338;
+                  DCOMP._IOwnership _out339;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out340;
+                  (this).GenExprConvertToNewtype(e, selfIdent, @params, expectedOwnership, out _out338, out _out339, out _out340);
+                  r = _out338;
+                  resultingOwnership = _out339;
+                  readIdents = _out340;
+                }
+              }
+            } else if (_source115.is_Nullable) {
+              DAST._IType _2786___mcc_h160 = _source115.dtor_Nullable_a0;
+              {
+                RAST._IExpr _out341;
+                DCOMP._IOwnership _out342;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out343;
+                (this).GenExprConvertToNullable(e, selfIdent, @params, expectedOwnership, out _out341, out _out342, out _out343);
+                r = _out341;
+                resultingOwnership = _out342;
+                readIdents = _out343;
+              }
+            } else if (_source115.is_Tuple) {
+              Dafny.ISequence<DAST._IType> _2787___mcc_h163 = _source115.dtor_Tuple_a0;
+              bool _2788_erase = _2768___mcc_h126;
+              DAST._INewtypeRange _2789_range = _2767___mcc_h125;
+              DAST._IType _2790_b = _2766___mcc_h124;
+              {
+                RAST._IExpr _out344;
+                DCOMP._IOwnership _out345;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out346;
+                (this).GenExprConvertFromNewtype(e, selfIdent, @params, expectedOwnership, out _out344, out _out345, out _out346);
+                r = _out344;
+                resultingOwnership = _out345;
+                readIdents = _out346;
+              }
+            } else if (_source115.is_Array) {
+              DAST._IType _2791___mcc_h166 = _source115.dtor_element;
+              BigInteger _2792___mcc_h167 = _source115.dtor_dims;
+              bool _2793_erase = _2768___mcc_h126;
+              DAST._INewtypeRange _2794_range = _2767___mcc_h125;
+              DAST._IType _2795_b = _2766___mcc_h124;
+              {
+                RAST._IExpr _out347;
+                DCOMP._IOwnership _out348;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out349;
+                (this).GenExprConvertFromNewtype(e, selfIdent, @params, expectedOwnership, out _out347, out _out348, out _out349);
+                r = _out347;
+                resultingOwnership = _out348;
+                readIdents = _out349;
+              }
+            } else if (_source115.is_Seq) {
+              DAST._IType _2796___mcc_h172 = _source115.dtor_element;
+              bool _2797_erase = _2768___mcc_h126;
+              DAST._INewtypeRange _2798_range = _2767___mcc_h125;
+              DAST._IType _2799_b = _2766___mcc_h124;
+              {
+                RAST._IExpr _out350;
+                DCOMP._IOwnership _out351;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out352;
+                (this).GenExprConvertFromNewtype(e, selfIdent, @params, expectedOwnership, out _out350, out _out351, out _out352);
+                r = _out350;
+                resultingOwnership = _out351;
+                readIdents = _out352;
+              }
+            } else if (_source115.is_Set) {
+              DAST._IType _2800___mcc_h175 = _source115.dtor_element;
+              bool _2801_erase = _2768___mcc_h126;
+              DAST._INewtypeRange _2802_range = _2767___mcc_h125;
+              DAST._IType _2803_b = _2766___mcc_h124;
+              {
+                RAST._IExpr _out353;
+                DCOMP._IOwnership _out354;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out355;
+                (this).GenExprConvertFromNewtype(e, selfIdent, @params, expectedOwnership, out _out353, out _out354, out _out355);
+                r = _out353;
+                resultingOwnership = _out354;
+                readIdents = _out355;
+              }
+            } else if (_source115.is_Multiset) {
+              DAST._IType _2804___mcc_h178 = _source115.dtor_element;
+              bool _2805_erase = _2768___mcc_h126;
+              DAST._INewtypeRange _2806_range = _2767___mcc_h125;
+              DAST._IType _2807_b = _2766___mcc_h124;
+              {
+                RAST._IExpr _out356;
+                DCOMP._IOwnership _out357;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out358;
+                (this).GenExprConvertFromNewtype(e, selfIdent, @params, expectedOwnership, out _out356, out _out357, out _out358);
+                r = _out356;
+                resultingOwnership = _out357;
+                readIdents = _out358;
+              }
+            } else if (_source115.is_Map) {
+              DAST._IType _2808___mcc_h181 = _source115.dtor_key;
+              DAST._IType _2809___mcc_h182 = _source115.dtor_value;
+              bool _2810_erase = _2768___mcc_h126;
+              DAST._INewtypeRange _2811_range = _2767___mcc_h125;
+              DAST._IType _2812_b = _2766___mcc_h124;
+              {
+                RAST._IExpr _out359;
+                DCOMP._IOwnership _out360;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out361;
+                (this).GenExprConvertFromNewtype(e, selfIdent, @params, expectedOwnership, out _out359, out _out360, out _out361);
+                r = _out359;
+                resultingOwnership = _out360;
+                readIdents = _out361;
+              }
+            } else if (_source115.is_SetBuilder) {
+              DAST._IType _2813___mcc_h187 = _source115.dtor_element;
+              bool _2814_erase = _2768___mcc_h126;
+              DAST._INewtypeRange _2815_range = _2767___mcc_h125;
+              DAST._IType _2816_b = _2766___mcc_h124;
+              {
+                RAST._IExpr _out362;
+                DCOMP._IOwnership _out363;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out364;
+                (this).GenExprConvertFromNewtype(e, selfIdent, @params, expectedOwnership, out _out362, out _out363, out _out364);
+                r = _out362;
+                resultingOwnership = _out363;
+                readIdents = _out364;
+              }
+            } else if (_source115.is_MapBuilder) {
+              DAST._IType _2817___mcc_h190 = _source115.dtor_key;
+              DAST._IType _2818___mcc_h191 = _source115.dtor_value;
+              bool _2819_erase = _2768___mcc_h126;
+              DAST._INewtypeRange _2820_range = _2767___mcc_h125;
+              DAST._IType _2821_b = _2766___mcc_h124;
+              {
+                RAST._IExpr _out365;
+                DCOMP._IOwnership _out366;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out367;
+                (this).GenExprConvertFromNewtype(e, selfIdent, @params, expectedOwnership, out _out365, out _out366, out _out367);
+                r = _out365;
+                resultingOwnership = _out366;
+                readIdents = _out367;
+              }
+            } else if (_source115.is_Arrow) {
+              Dafny.ISequence<DAST._IType> _2822___mcc_h196 = _source115.dtor_args;
+              DAST._IType _2823___mcc_h197 = _source115.dtor_result;
+              bool _2824_erase = _2768___mcc_h126;
+              DAST._INewtypeRange _2825_range = _2767___mcc_h125;
+              DAST._IType _2826_b = _2766___mcc_h124;
+              {
+                RAST._IExpr _out368;
+                DCOMP._IOwnership _out369;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out370;
+                (this).GenExprConvertFromNewtype(e, selfIdent, @params, expectedOwnership, out _out368, out _out369, out _out370);
+                r = _out368;
+                resultingOwnership = _out369;
+                readIdents = _out370;
+              }
+            } else if (_source115.is_Primitive) {
+              DAST._IPrimitive _2827___mcc_h202 = _source115.dtor_Primitive_a0;
+              bool _2828_erase = _2768___mcc_h126;
+              DAST._INewtypeRange _2829_range = _2767___mcc_h125;
+              DAST._IType _2830_b = _2766___mcc_h124;
+              {
+                RAST._IExpr _out371;
+                DCOMP._IOwnership _out372;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out373;
+                (this).GenExprConvertFromNewtype(e, selfIdent, @params, expectedOwnership, out _out371, out _out372, out _out373);
+                r = _out371;
+                resultingOwnership = _out372;
+                readIdents = _out373;
+              }
+            } else if (_source115.is_Passthrough) {
+              Dafny.ISequence<Dafny.Rune> _2831___mcc_h205 = _source115.dtor_Passthrough_a0;
+              bool _2832_erase = _2768___mcc_h126;
+              DAST._INewtypeRange _2833_range = _2767___mcc_h125;
+              DAST._IType _2834_b = _2766___mcc_h124;
+              {
+                RAST._IExpr _out374;
+                DCOMP._IOwnership _out375;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out376;
+                (this).GenExprConvertFromNewtype(e, selfIdent, @params, expectedOwnership, out _out374, out _out375, out _out376);
+                r = _out374;
+                resultingOwnership = _out375;
+                readIdents = _out376;
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _2835___mcc_h208 = _source115.dtor_TypeArg_a0;
+              bool _2836_erase = _2768___mcc_h126;
+              DAST._INewtypeRange _2837_range = _2767___mcc_h125;
+              DAST._IType _2838_b = _2766___mcc_h124;
+              {
+                RAST._IExpr _out377;
+                DCOMP._IOwnership _out378;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out379;
+                (this).GenExprConvertFromNewtype(e, selfIdent, @params, expectedOwnership, out _out377, out _out378, out _out379);
+                r = _out377;
+                resultingOwnership = _out378;
+                readIdents = _out379;
+              }
+            }
+          }
+        } else if (_source109.is_Nullable) {
+          DAST._IType _2839___mcc_h211 = _source109.dtor_Nullable_a0;
+          DAST._IType _source117 = _2704___mcc_h1;
+          if (_source117.is_Path) {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2840___mcc_h215 = _source117.dtor_Path_a0;
+            Dafny.ISequence<DAST._IType> _2841___mcc_h216 = _source117.dtor_typeArgs;
+            DAST._IResolvedType _2842___mcc_h217 = _source117.dtor_resolved;
+            DAST._IResolvedType _source118 = _2842___mcc_h217;
+            if (_source118.is_Datatype) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2843___mcc_h224 = _source118.dtor_path;
+              {
+                RAST._IExpr _out380;
+                DCOMP._IOwnership _out381;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out382;
+                (this).GenExprConvertFromNullable(e, selfIdent, @params, expectedOwnership, out _out380, out _out381, out _out382);
+                r = _out380;
+                resultingOwnership = _out381;
+                readIdents = _out382;
+              }
+            } else if (_source118.is_Trait) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2844___mcc_h227 = _source118.dtor_path;
+              {
+                RAST._IExpr _out383;
+                DCOMP._IOwnership _out384;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out385;
+                (this).GenExprConvertFromNullable(e, selfIdent, @params, expectedOwnership, out _out383, out _out384, out _out385);
+                r = _out383;
+                resultingOwnership = _out384;
+                readIdents = _out385;
+              }
+            } else {
+              DAST._IType _2845___mcc_h230 = _source118.dtor_baseType;
+              DAST._INewtypeRange _2846___mcc_h231 = _source118.dtor_range;
+              bool _2847___mcc_h232 = _source118.dtor_erase;
+              {
+                RAST._IExpr _out386;
+                DCOMP._IOwnership _out387;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out388;
+                (this).GenExprConvertFromNullable(e, selfIdent, @params, expectedOwnership, out _out386, out _out387, out _out388);
+                r = _out386;
+                resultingOwnership = _out387;
+                readIdents = _out388;
+              }
+            }
+          } else if (_source117.is_Nullable) {
+            DAST._IType _2848___mcc_h239 = _source117.dtor_Nullable_a0;
+            {
+              RAST._IExpr _out389;
+              DCOMP._IOwnership _out390;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out391;
+              (this).GenExprConvertFromNullable(e, selfIdent, @params, expectedOwnership, out _out389, out _out390, out _out391);
+              r = _out389;
+              resultingOwnership = _out390;
+              readIdents = _out391;
+            }
+          } else if (_source117.is_Tuple) {
+            Dafny.ISequence<DAST._IType> _2849___mcc_h242 = _source117.dtor_Tuple_a0;
+            {
+              RAST._IExpr _out392;
+              DCOMP._IOwnership _out393;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out394;
+              (this).GenExprConvertFromNullable(e, selfIdent, @params, expectedOwnership, out _out392, out _out393, out _out394);
+              r = _out392;
+              resultingOwnership = _out393;
+              readIdents = _out394;
+            }
+          } else if (_source117.is_Array) {
+            DAST._IType _2850___mcc_h245 = _source117.dtor_element;
+            BigInteger _2851___mcc_h246 = _source117.dtor_dims;
+            {
+              RAST._IExpr _out395;
+              DCOMP._IOwnership _out396;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out397;
+              (this).GenExprConvertFromNullable(e, selfIdent, @params, expectedOwnership, out _out395, out _out396, out _out397);
+              r = _out395;
+              resultingOwnership = _out396;
+              readIdents = _out397;
+            }
+          } else if (_source117.is_Seq) {
+            DAST._IType _2852___mcc_h251 = _source117.dtor_element;
+            {
+              RAST._IExpr _out398;
+              DCOMP._IOwnership _out399;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out400;
+              (this).GenExprConvertFromNullable(e, selfIdent, @params, expectedOwnership, out _out398, out _out399, out _out400);
+              r = _out398;
+              resultingOwnership = _out399;
+              readIdents = _out400;
+            }
+          } else if (_source117.is_Set) {
+            DAST._IType _2853___mcc_h254 = _source117.dtor_element;
+            {
+              RAST._IExpr _out401;
+              DCOMP._IOwnership _out402;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out403;
+              (this).GenExprConvertFromNullable(e, selfIdent, @params, expectedOwnership, out _out401, out _out402, out _out403);
+              r = _out401;
+              resultingOwnership = _out402;
+              readIdents = _out403;
+            }
+          } else if (_source117.is_Multiset) {
+            DAST._IType _2854___mcc_h257 = _source117.dtor_element;
+            {
+              RAST._IExpr _out404;
+              DCOMP._IOwnership _out405;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out406;
+              (this).GenExprConvertFromNullable(e, selfIdent, @params, expectedOwnership, out _out404, out _out405, out _out406);
+              r = _out404;
+              resultingOwnership = _out405;
+              readIdents = _out406;
+            }
+          } else if (_source117.is_Map) {
+            DAST._IType _2855___mcc_h260 = _source117.dtor_key;
+            DAST._IType _2856___mcc_h261 = _source117.dtor_value;
+            {
+              RAST._IExpr _out407;
+              DCOMP._IOwnership _out408;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out409;
+              (this).GenExprConvertFromNullable(e, selfIdent, @params, expectedOwnership, out _out407, out _out408, out _out409);
+              r = _out407;
+              resultingOwnership = _out408;
+              readIdents = _out409;
+            }
+          } else if (_source117.is_SetBuilder) {
+            DAST._IType _2857___mcc_h266 = _source117.dtor_element;
+            {
+              RAST._IExpr _out410;
+              DCOMP._IOwnership _out411;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out412;
+              (this).GenExprConvertFromNullable(e, selfIdent, @params, expectedOwnership, out _out410, out _out411, out _out412);
+              r = _out410;
+              resultingOwnership = _out411;
+              readIdents = _out412;
+            }
+          } else if (_source117.is_MapBuilder) {
+            DAST._IType _2858___mcc_h269 = _source117.dtor_key;
+            DAST._IType _2859___mcc_h270 = _source117.dtor_value;
+            {
+              RAST._IExpr _out413;
+              DCOMP._IOwnership _out414;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out415;
+              (this).GenExprConvertFromNullable(e, selfIdent, @params, expectedOwnership, out _out413, out _out414, out _out415);
+              r = _out413;
+              resultingOwnership = _out414;
+              readIdents = _out415;
+            }
+          } else if (_source117.is_Arrow) {
+            Dafny.ISequence<DAST._IType> _2860___mcc_h275 = _source117.dtor_args;
+            DAST._IType _2861___mcc_h276 = _source117.dtor_result;
+            {
+              RAST._IExpr _out416;
+              DCOMP._IOwnership _out417;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out418;
+              (this).GenExprConvertFromNullable(e, selfIdent, @params, expectedOwnership, out _out416, out _out417, out _out418);
+              r = _out416;
+              resultingOwnership = _out417;
+              readIdents = _out418;
+            }
+          } else if (_source117.is_Primitive) {
+            DAST._IPrimitive _2862___mcc_h281 = _source117.dtor_Primitive_a0;
+            {
+              RAST._IExpr _out419;
+              DCOMP._IOwnership _out420;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out421;
+              (this).GenExprConvertFromNullable(e, selfIdent, @params, expectedOwnership, out _out419, out _out420, out _out421);
+              r = _out419;
+              resultingOwnership = _out420;
+              readIdents = _out421;
+            }
+          } else if (_source117.is_Passthrough) {
+            Dafny.ISequence<Dafny.Rune> _2863___mcc_h284 = _source117.dtor_Passthrough_a0;
+            {
+              RAST._IExpr _out422;
+              DCOMP._IOwnership _out423;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out424;
+              (this).GenExprConvertFromNullable(e, selfIdent, @params, expectedOwnership, out _out422, out _out423, out _out424);
+              r = _out422;
+              resultingOwnership = _out423;
+              readIdents = _out424;
+            }
+          } else {
+            Dafny.ISequence<Dafny.Rune> _2864___mcc_h287 = _source117.dtor_TypeArg_a0;
+            {
+              RAST._IExpr _out425;
+              DCOMP._IOwnership _out426;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out427;
+              (this).GenExprConvertFromNullable(e, selfIdent, @params, expectedOwnership, out _out425, out _out426, out _out427);
+              r = _out425;
+              resultingOwnership = _out426;
+              readIdents = _out427;
+            }
+          }
+        } else if (_source109.is_Tuple) {
+          Dafny.ISequence<DAST._IType> _2865___mcc_h290 = _source109.dtor_Tuple_a0;
+          DAST._IType _source119 = _2704___mcc_h1;
+          if (_source119.is_Path) {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2866___mcc_h294 = _source119.dtor_Path_a0;
+            Dafny.ISequence<DAST._IType> _2867___mcc_h295 = _source119.dtor_typeArgs;
+            DAST._IResolvedType _2868___mcc_h296 = _source119.dtor_resolved;
+            DAST._IResolvedType _source120 = _2868___mcc_h296;
+            if (_source120.is_Datatype) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2869___mcc_h300 = _source120.dtor_path;
+              {
+                RAST._IExpr _out428;
+                DCOMP._IOwnership _out429;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out430;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out428, out _out429, out _out430);
+                r = _out428;
+                resultingOwnership = _out429;
+                readIdents = _out430;
+              }
+            } else if (_source120.is_Trait) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2870___mcc_h302 = _source120.dtor_path;
+              {
+                RAST._IExpr _out431;
+                DCOMP._IOwnership _out432;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out433;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out431, out _out432, out _out433);
+                r = _out431;
+                resultingOwnership = _out432;
+                readIdents = _out433;
+              }
+            } else {
+              DAST._IType _2871___mcc_h304 = _source120.dtor_baseType;
+              DAST._INewtypeRange _2872___mcc_h305 = _source120.dtor_range;
+              bool _2873___mcc_h306 = _source120.dtor_erase;
+              bool _2874_erase = _2873___mcc_h306;
+              DAST._INewtypeRange _2875_range = _2872___mcc_h305;
+              DAST._IType _2876_b = _2871___mcc_h304;
+              {
+                RAST._IExpr _out434;
+                DCOMP._IOwnership _out435;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out436;
+                (this).GenExprConvertToNewtype(e, selfIdent, @params, expectedOwnership, out _out434, out _out435, out _out436);
+                r = _out434;
+                resultingOwnership = _out435;
+                readIdents = _out436;
+              }
+            }
+          } else if (_source119.is_Nullable) {
+            DAST._IType _2877___mcc_h310 = _source119.dtor_Nullable_a0;
+            {
+              RAST._IExpr _out437;
+              DCOMP._IOwnership _out438;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out439;
+              (this).GenExprConvertToNullable(e, selfIdent, @params, expectedOwnership, out _out437, out _out438, out _out439);
+              r = _out437;
+              resultingOwnership = _out438;
+              readIdents = _out439;
+            }
+          } else if (_source119.is_Tuple) {
+            Dafny.ISequence<DAST._IType> _2878___mcc_h312 = _source119.dtor_Tuple_a0;
+            {
+              RAST._IExpr _out440;
+              DCOMP._IOwnership _out441;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out442;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out440, out _out441, out _out442);
+              r = _out440;
+              resultingOwnership = _out441;
+              readIdents = _out442;
+            }
+          } else if (_source119.is_Array) {
+            DAST._IType _2879___mcc_h314 = _source119.dtor_element;
+            BigInteger _2880___mcc_h315 = _source119.dtor_dims;
+            {
+              RAST._IExpr _out443;
+              DCOMP._IOwnership _out444;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out445;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out443, out _out444, out _out445);
+              r = _out443;
+              resultingOwnership = _out444;
+              readIdents = _out445;
+            }
+          } else if (_source119.is_Seq) {
+            DAST._IType _2881___mcc_h318 = _source119.dtor_element;
+            {
+              RAST._IExpr _out446;
+              DCOMP._IOwnership _out447;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out448;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out446, out _out447, out _out448);
+              r = _out446;
+              resultingOwnership = _out447;
+              readIdents = _out448;
+            }
+          } else if (_source119.is_Set) {
+            DAST._IType _2882___mcc_h320 = _source119.dtor_element;
+            {
+              RAST._IExpr _out449;
+              DCOMP._IOwnership _out450;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out451;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out449, out _out450, out _out451);
+              r = _out449;
+              resultingOwnership = _out450;
+              readIdents = _out451;
+            }
+          } else if (_source119.is_Multiset) {
+            DAST._IType _2883___mcc_h322 = _source119.dtor_element;
+            {
+              RAST._IExpr _out452;
+              DCOMP._IOwnership _out453;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out454;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out452, out _out453, out _out454);
+              r = _out452;
+              resultingOwnership = _out453;
+              readIdents = _out454;
+            }
+          } else if (_source119.is_Map) {
+            DAST._IType _2884___mcc_h324 = _source119.dtor_key;
+            DAST._IType _2885___mcc_h325 = _source119.dtor_value;
+            {
+              RAST._IExpr _out455;
+              DCOMP._IOwnership _out456;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out457;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out455, out _out456, out _out457);
+              r = _out455;
+              resultingOwnership = _out456;
+              readIdents = _out457;
+            }
+          } else if (_source119.is_SetBuilder) {
+            DAST._IType _2886___mcc_h328 = _source119.dtor_element;
+            {
+              RAST._IExpr _out458;
+              DCOMP._IOwnership _out459;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out460;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out458, out _out459, out _out460);
+              r = _out458;
+              resultingOwnership = _out459;
+              readIdents = _out460;
+            }
+          } else if (_source119.is_MapBuilder) {
+            DAST._IType _2887___mcc_h330 = _source119.dtor_key;
+            DAST._IType _2888___mcc_h331 = _source119.dtor_value;
+            {
+              RAST._IExpr _out461;
+              DCOMP._IOwnership _out462;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out463;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out461, out _out462, out _out463);
+              r = _out461;
+              resultingOwnership = _out462;
+              readIdents = _out463;
+            }
+          } else if (_source119.is_Arrow) {
+            Dafny.ISequence<DAST._IType> _2889___mcc_h334 = _source119.dtor_args;
+            DAST._IType _2890___mcc_h335 = _source119.dtor_result;
+            {
+              RAST._IExpr _out464;
+              DCOMP._IOwnership _out465;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out466;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out464, out _out465, out _out466);
+              r = _out464;
+              resultingOwnership = _out465;
+              readIdents = _out466;
+            }
+          } else if (_source119.is_Primitive) {
+            DAST._IPrimitive _2891___mcc_h338 = _source119.dtor_Primitive_a0;
+            {
+              RAST._IExpr _out467;
+              DCOMP._IOwnership _out468;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out469;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out467, out _out468, out _out469);
+              r = _out467;
+              resultingOwnership = _out468;
+              readIdents = _out469;
+            }
+          } else if (_source119.is_Passthrough) {
+            Dafny.ISequence<Dafny.Rune> _2892___mcc_h340 = _source119.dtor_Passthrough_a0;
+            {
+              RAST._IExpr _out470;
+              DCOMP._IOwnership _out471;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out472;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out470, out _out471, out _out472);
+              r = _out470;
+              resultingOwnership = _out471;
+              readIdents = _out472;
+            }
+          } else {
+            Dafny.ISequence<Dafny.Rune> _2893___mcc_h342 = _source119.dtor_TypeArg_a0;
+            {
+              RAST._IExpr _out473;
+              DCOMP._IOwnership _out474;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out475;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out473, out _out474, out _out475);
+              r = _out473;
+              resultingOwnership = _out474;
+              readIdents = _out475;
+            }
+          }
+        } else if (_source109.is_Array) {
+          DAST._IType _2894___mcc_h344 = _source109.dtor_element;
+          BigInteger _2895___mcc_h345 = _source109.dtor_dims;
+          DAST._IType _source121 = _2704___mcc_h1;
+          if (_source121.is_Path) {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2896___mcc_h352 = _source121.dtor_Path_a0;
+            Dafny.ISequence<DAST._IType> _2897___mcc_h353 = _source121.dtor_typeArgs;
+            DAST._IResolvedType _2898___mcc_h354 = _source121.dtor_resolved;
+            DAST._IResolvedType _source122 = _2898___mcc_h354;
+            if (_source122.is_Datatype) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2899___mcc_h358 = _source122.dtor_path;
+              {
+                RAST._IExpr _out476;
+                DCOMP._IOwnership _out477;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out478;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out476, out _out477, out _out478);
+                r = _out476;
+                resultingOwnership = _out477;
+                readIdents = _out478;
+              }
+            } else if (_source122.is_Trait) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2900___mcc_h360 = _source122.dtor_path;
+              {
+                RAST._IExpr _out479;
+                DCOMP._IOwnership _out480;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out481;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out479, out _out480, out _out481);
+                r = _out479;
+                resultingOwnership = _out480;
+                readIdents = _out481;
+              }
+            } else {
+              DAST._IType _2901___mcc_h362 = _source122.dtor_baseType;
+              DAST._INewtypeRange _2902___mcc_h363 = _source122.dtor_range;
+              bool _2903___mcc_h364 = _source122.dtor_erase;
+              bool _2904_erase = _2903___mcc_h364;
+              DAST._INewtypeRange _2905_range = _2902___mcc_h363;
+              DAST._IType _2906_b = _2901___mcc_h362;
+              {
+                RAST._IExpr _out482;
+                DCOMP._IOwnership _out483;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out484;
+                (this).GenExprConvertToNewtype(e, selfIdent, @params, expectedOwnership, out _out482, out _out483, out _out484);
+                r = _out482;
+                resultingOwnership = _out483;
+                readIdents = _out484;
+              }
+            }
+          } else if (_source121.is_Nullable) {
+            DAST._IType _2907___mcc_h368 = _source121.dtor_Nullable_a0;
+            {
+              RAST._IExpr _out485;
+              DCOMP._IOwnership _out486;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out487;
+              (this).GenExprConvertToNullable(e, selfIdent, @params, expectedOwnership, out _out485, out _out486, out _out487);
+              r = _out485;
+              resultingOwnership = _out486;
+              readIdents = _out487;
+            }
+          } else if (_source121.is_Tuple) {
+            Dafny.ISequence<DAST._IType> _2908___mcc_h370 = _source121.dtor_Tuple_a0;
+            {
+              RAST._IExpr _out488;
+              DCOMP._IOwnership _out489;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out490;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out488, out _out489, out _out490);
+              r = _out488;
+              resultingOwnership = _out489;
+              readIdents = _out490;
+            }
+          } else if (_source121.is_Array) {
+            DAST._IType _2909___mcc_h372 = _source121.dtor_element;
+            BigInteger _2910___mcc_h373 = _source121.dtor_dims;
+            {
+              RAST._IExpr _out491;
+              DCOMP._IOwnership _out492;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out493;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out491, out _out492, out _out493);
+              r = _out491;
+              resultingOwnership = _out492;
+              readIdents = _out493;
+            }
+          } else if (_source121.is_Seq) {
+            DAST._IType _2911___mcc_h376 = _source121.dtor_element;
+            {
+              RAST._IExpr _out494;
+              DCOMP._IOwnership _out495;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out496;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out494, out _out495, out _out496);
+              r = _out494;
+              resultingOwnership = _out495;
+              readIdents = _out496;
+            }
+          } else if (_source121.is_Set) {
+            DAST._IType _2912___mcc_h378 = _source121.dtor_element;
+            {
+              RAST._IExpr _out497;
+              DCOMP._IOwnership _out498;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out499;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out497, out _out498, out _out499);
+              r = _out497;
+              resultingOwnership = _out498;
+              readIdents = _out499;
+            }
+          } else if (_source121.is_Multiset) {
+            DAST._IType _2913___mcc_h380 = _source121.dtor_element;
+            {
+              RAST._IExpr _out500;
+              DCOMP._IOwnership _out501;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out502;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out500, out _out501, out _out502);
+              r = _out500;
+              resultingOwnership = _out501;
+              readIdents = _out502;
+            }
+          } else if (_source121.is_Map) {
+            DAST._IType _2914___mcc_h382 = _source121.dtor_key;
+            DAST._IType _2915___mcc_h383 = _source121.dtor_value;
+            {
+              RAST._IExpr _out503;
+              DCOMP._IOwnership _out504;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out505;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out503, out _out504, out _out505);
+              r = _out503;
+              resultingOwnership = _out504;
+              readIdents = _out505;
+            }
+          } else if (_source121.is_SetBuilder) {
+            DAST._IType _2916___mcc_h386 = _source121.dtor_element;
+            {
+              RAST._IExpr _out506;
+              DCOMP._IOwnership _out507;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out508;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out506, out _out507, out _out508);
+              r = _out506;
+              resultingOwnership = _out507;
+              readIdents = _out508;
+            }
+          } else if (_source121.is_MapBuilder) {
+            DAST._IType _2917___mcc_h388 = _source121.dtor_key;
+            DAST._IType _2918___mcc_h389 = _source121.dtor_value;
+            {
+              RAST._IExpr _out509;
+              DCOMP._IOwnership _out510;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out511;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out509, out _out510, out _out511);
+              r = _out509;
+              resultingOwnership = _out510;
+              readIdents = _out511;
+            }
+          } else if (_source121.is_Arrow) {
+            Dafny.ISequence<DAST._IType> _2919___mcc_h392 = _source121.dtor_args;
+            DAST._IType _2920___mcc_h393 = _source121.dtor_result;
+            {
+              RAST._IExpr _out512;
+              DCOMP._IOwnership _out513;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out514;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out512, out _out513, out _out514);
+              r = _out512;
+              resultingOwnership = _out513;
+              readIdents = _out514;
+            }
+          } else if (_source121.is_Primitive) {
+            DAST._IPrimitive _2921___mcc_h396 = _source121.dtor_Primitive_a0;
+            {
+              RAST._IExpr _out515;
+              DCOMP._IOwnership _out516;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out517;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out515, out _out516, out _out517);
+              r = _out515;
+              resultingOwnership = _out516;
+              readIdents = _out517;
+            }
+          } else if (_source121.is_Passthrough) {
+            Dafny.ISequence<Dafny.Rune> _2922___mcc_h398 = _source121.dtor_Passthrough_a0;
+            {
+              RAST._IExpr _out518;
+              DCOMP._IOwnership _out519;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out520;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out518, out _out519, out _out520);
+              r = _out518;
+              resultingOwnership = _out519;
+              readIdents = _out520;
+            }
+          } else {
+            Dafny.ISequence<Dafny.Rune> _2923___mcc_h400 = _source121.dtor_TypeArg_a0;
+            {
+              RAST._IExpr _out521;
+              DCOMP._IOwnership _out522;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out523;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out521, out _out522, out _out523);
+              r = _out521;
+              resultingOwnership = _out522;
+              readIdents = _out523;
+            }
+          }
+        } else if (_source109.is_Seq) {
+          DAST._IType _2924___mcc_h402 = _source109.dtor_element;
+          DAST._IType _source123 = _2704___mcc_h1;
+          if (_source123.is_Path) {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2925___mcc_h406 = _source123.dtor_Path_a0;
+            Dafny.ISequence<DAST._IType> _2926___mcc_h407 = _source123.dtor_typeArgs;
+            DAST._IResolvedType _2927___mcc_h408 = _source123.dtor_resolved;
+            DAST._IResolvedType _source124 = _2927___mcc_h408;
+            if (_source124.is_Datatype) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2928___mcc_h412 = _source124.dtor_path;
+              {
+                RAST._IExpr _out524;
+                DCOMP._IOwnership _out525;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out526;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out524, out _out525, out _out526);
+                r = _out524;
+                resultingOwnership = _out525;
+                readIdents = _out526;
+              }
+            } else if (_source124.is_Trait) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2929___mcc_h414 = _source124.dtor_path;
+              {
+                RAST._IExpr _out527;
+                DCOMP._IOwnership _out528;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out529;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out527, out _out528, out _out529);
+                r = _out527;
+                resultingOwnership = _out528;
+                readIdents = _out529;
+              }
+            } else {
+              DAST._IType _2930___mcc_h416 = _source124.dtor_baseType;
+              DAST._INewtypeRange _2931___mcc_h417 = _source124.dtor_range;
+              bool _2932___mcc_h418 = _source124.dtor_erase;
+              bool _2933_erase = _2932___mcc_h418;
+              DAST._INewtypeRange _2934_range = _2931___mcc_h417;
+              DAST._IType _2935_b = _2930___mcc_h416;
+              {
+                RAST._IExpr _out530;
+                DCOMP._IOwnership _out531;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out532;
+                (this).GenExprConvertToNewtype(e, selfIdent, @params, expectedOwnership, out _out530, out _out531, out _out532);
+                r = _out530;
+                resultingOwnership = _out531;
+                readIdents = _out532;
+              }
+            }
+          } else if (_source123.is_Nullable) {
+            DAST._IType _2936___mcc_h422 = _source123.dtor_Nullable_a0;
+            {
+              RAST._IExpr _out533;
+              DCOMP._IOwnership _out534;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out535;
+              (this).GenExprConvertToNullable(e, selfIdent, @params, expectedOwnership, out _out533, out _out534, out _out535);
+              r = _out533;
+              resultingOwnership = _out534;
+              readIdents = _out535;
+            }
+          } else if (_source123.is_Tuple) {
+            Dafny.ISequence<DAST._IType> _2937___mcc_h424 = _source123.dtor_Tuple_a0;
+            {
+              RAST._IExpr _out536;
+              DCOMP._IOwnership _out537;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out538;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out536, out _out537, out _out538);
+              r = _out536;
+              resultingOwnership = _out537;
+              readIdents = _out538;
+            }
+          } else if (_source123.is_Array) {
+            DAST._IType _2938___mcc_h426 = _source123.dtor_element;
+            BigInteger _2939___mcc_h427 = _source123.dtor_dims;
+            {
+              RAST._IExpr _out539;
+              DCOMP._IOwnership _out540;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out541;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out539, out _out540, out _out541);
+              r = _out539;
+              resultingOwnership = _out540;
+              readIdents = _out541;
+            }
+          } else if (_source123.is_Seq) {
+            DAST._IType _2940___mcc_h430 = _source123.dtor_element;
+            {
+              RAST._IExpr _out542;
+              DCOMP._IOwnership _out543;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out544;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out542, out _out543, out _out544);
+              r = _out542;
+              resultingOwnership = _out543;
+              readIdents = _out544;
+            }
+          } else if (_source123.is_Set) {
+            DAST._IType _2941___mcc_h432 = _source123.dtor_element;
+            {
+              RAST._IExpr _out545;
+              DCOMP._IOwnership _out546;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out547;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out545, out _out546, out _out547);
+              r = _out545;
+              resultingOwnership = _out546;
+              readIdents = _out547;
+            }
+          } else if (_source123.is_Multiset) {
+            DAST._IType _2942___mcc_h434 = _source123.dtor_element;
+            {
+              RAST._IExpr _out548;
+              DCOMP._IOwnership _out549;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out550;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out548, out _out549, out _out550);
+              r = _out548;
+              resultingOwnership = _out549;
+              readIdents = _out550;
+            }
+          } else if (_source123.is_Map) {
+            DAST._IType _2943___mcc_h436 = _source123.dtor_key;
+            DAST._IType _2944___mcc_h437 = _source123.dtor_value;
+            {
+              RAST._IExpr _out551;
+              DCOMP._IOwnership _out552;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out553;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out551, out _out552, out _out553);
+              r = _out551;
+              resultingOwnership = _out552;
+              readIdents = _out553;
+            }
+          } else if (_source123.is_SetBuilder) {
+            DAST._IType _2945___mcc_h440 = _source123.dtor_element;
+            {
+              RAST._IExpr _out554;
+              DCOMP._IOwnership _out555;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out556;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out554, out _out555, out _out556);
+              r = _out554;
+              resultingOwnership = _out555;
+              readIdents = _out556;
+            }
+          } else if (_source123.is_MapBuilder) {
+            DAST._IType _2946___mcc_h442 = _source123.dtor_key;
+            DAST._IType _2947___mcc_h443 = _source123.dtor_value;
+            {
+              RAST._IExpr _out557;
+              DCOMP._IOwnership _out558;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out559;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out557, out _out558, out _out559);
+              r = _out557;
+              resultingOwnership = _out558;
+              readIdents = _out559;
+            }
+          } else if (_source123.is_Arrow) {
+            Dafny.ISequence<DAST._IType> _2948___mcc_h446 = _source123.dtor_args;
+            DAST._IType _2949___mcc_h447 = _source123.dtor_result;
+            {
+              RAST._IExpr _out560;
+              DCOMP._IOwnership _out561;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out562;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out560, out _out561, out _out562);
+              r = _out560;
+              resultingOwnership = _out561;
+              readIdents = _out562;
+            }
+          } else if (_source123.is_Primitive) {
+            DAST._IPrimitive _2950___mcc_h450 = _source123.dtor_Primitive_a0;
+            {
+              RAST._IExpr _out563;
+              DCOMP._IOwnership _out564;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out565;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out563, out _out564, out _out565);
+              r = _out563;
+              resultingOwnership = _out564;
+              readIdents = _out565;
+            }
+          } else if (_source123.is_Passthrough) {
+            Dafny.ISequence<Dafny.Rune> _2951___mcc_h452 = _source123.dtor_Passthrough_a0;
+            {
+              RAST._IExpr _out566;
+              DCOMP._IOwnership _out567;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out568;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out566, out _out567, out _out568);
+              r = _out566;
+              resultingOwnership = _out567;
+              readIdents = _out568;
+            }
+          } else {
+            Dafny.ISequence<Dafny.Rune> _2952___mcc_h454 = _source123.dtor_TypeArg_a0;
+            {
+              RAST._IExpr _out569;
+              DCOMP._IOwnership _out570;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out571;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out569, out _out570, out _out571);
+              r = _out569;
+              resultingOwnership = _out570;
+              readIdents = _out571;
+            }
+          }
+        } else if (_source109.is_Set) {
+          DAST._IType _2953___mcc_h456 = _source109.dtor_element;
+          DAST._IType _source125 = _2704___mcc_h1;
+          if (_source125.is_Path) {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2954___mcc_h460 = _source125.dtor_Path_a0;
+            Dafny.ISequence<DAST._IType> _2955___mcc_h461 = _source125.dtor_typeArgs;
+            DAST._IResolvedType _2956___mcc_h462 = _source125.dtor_resolved;
+            DAST._IResolvedType _source126 = _2956___mcc_h462;
+            if (_source126.is_Datatype) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2957___mcc_h466 = _source126.dtor_path;
+              {
+                RAST._IExpr _out572;
+                DCOMP._IOwnership _out573;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out574;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out572, out _out573, out _out574);
+                r = _out572;
+                resultingOwnership = _out573;
+                readIdents = _out574;
+              }
+            } else if (_source126.is_Trait) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2958___mcc_h468 = _source126.dtor_path;
+              {
+                RAST._IExpr _out575;
+                DCOMP._IOwnership _out576;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out577;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out575, out _out576, out _out577);
+                r = _out575;
+                resultingOwnership = _out576;
+                readIdents = _out577;
+              }
+            } else {
+              DAST._IType _2959___mcc_h470 = _source126.dtor_baseType;
+              DAST._INewtypeRange _2960___mcc_h471 = _source126.dtor_range;
+              bool _2961___mcc_h472 = _source126.dtor_erase;
+              bool _2962_erase = _2961___mcc_h472;
+              DAST._INewtypeRange _2963_range = _2960___mcc_h471;
+              DAST._IType _2964_b = _2959___mcc_h470;
+              {
+                RAST._IExpr _out578;
+                DCOMP._IOwnership _out579;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out580;
+                (this).GenExprConvertToNewtype(e, selfIdent, @params, expectedOwnership, out _out578, out _out579, out _out580);
+                r = _out578;
+                resultingOwnership = _out579;
+                readIdents = _out580;
+              }
+            }
+          } else if (_source125.is_Nullable) {
+            DAST._IType _2965___mcc_h476 = _source125.dtor_Nullable_a0;
+            {
+              RAST._IExpr _out581;
+              DCOMP._IOwnership _out582;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out583;
+              (this).GenExprConvertToNullable(e, selfIdent, @params, expectedOwnership, out _out581, out _out582, out _out583);
+              r = _out581;
+              resultingOwnership = _out582;
+              readIdents = _out583;
+            }
+          } else if (_source125.is_Tuple) {
+            Dafny.ISequence<DAST._IType> _2966___mcc_h478 = _source125.dtor_Tuple_a0;
+            {
+              RAST._IExpr _out584;
+              DCOMP._IOwnership _out585;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out586;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out584, out _out585, out _out586);
+              r = _out584;
+              resultingOwnership = _out585;
+              readIdents = _out586;
+            }
+          } else if (_source125.is_Array) {
+            DAST._IType _2967___mcc_h480 = _source125.dtor_element;
+            BigInteger _2968___mcc_h481 = _source125.dtor_dims;
+            {
+              RAST._IExpr _out587;
+              DCOMP._IOwnership _out588;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out589;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out587, out _out588, out _out589);
+              r = _out587;
+              resultingOwnership = _out588;
+              readIdents = _out589;
+            }
+          } else if (_source125.is_Seq) {
+            DAST._IType _2969___mcc_h484 = _source125.dtor_element;
+            {
+              RAST._IExpr _out590;
+              DCOMP._IOwnership _out591;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out592;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out590, out _out591, out _out592);
+              r = _out590;
+              resultingOwnership = _out591;
+              readIdents = _out592;
+            }
+          } else if (_source125.is_Set) {
+            DAST._IType _2970___mcc_h486 = _source125.dtor_element;
+            {
+              RAST._IExpr _out593;
+              DCOMP._IOwnership _out594;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out595;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out593, out _out594, out _out595);
+              r = _out593;
+              resultingOwnership = _out594;
+              readIdents = _out595;
+            }
+          } else if (_source125.is_Multiset) {
+            DAST._IType _2971___mcc_h488 = _source125.dtor_element;
+            {
+              RAST._IExpr _out596;
+              DCOMP._IOwnership _out597;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out598;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out596, out _out597, out _out598);
+              r = _out596;
+              resultingOwnership = _out597;
+              readIdents = _out598;
+            }
+          } else if (_source125.is_Map) {
+            DAST._IType _2972___mcc_h490 = _source125.dtor_key;
+            DAST._IType _2973___mcc_h491 = _source125.dtor_value;
+            {
+              RAST._IExpr _out599;
+              DCOMP._IOwnership _out600;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out601;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out599, out _out600, out _out601);
+              r = _out599;
+              resultingOwnership = _out600;
+              readIdents = _out601;
+            }
+          } else if (_source125.is_SetBuilder) {
+            DAST._IType _2974___mcc_h494 = _source125.dtor_element;
+            {
+              RAST._IExpr _out602;
+              DCOMP._IOwnership _out603;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out604;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out602, out _out603, out _out604);
+              r = _out602;
+              resultingOwnership = _out603;
+              readIdents = _out604;
+            }
+          } else if (_source125.is_MapBuilder) {
+            DAST._IType _2975___mcc_h496 = _source125.dtor_key;
+            DAST._IType _2976___mcc_h497 = _source125.dtor_value;
+            {
+              RAST._IExpr _out605;
+              DCOMP._IOwnership _out606;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out607;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out605, out _out606, out _out607);
+              r = _out605;
+              resultingOwnership = _out606;
+              readIdents = _out607;
+            }
+          } else if (_source125.is_Arrow) {
+            Dafny.ISequence<DAST._IType> _2977___mcc_h500 = _source125.dtor_args;
+            DAST._IType _2978___mcc_h501 = _source125.dtor_result;
+            {
+              RAST._IExpr _out608;
+              DCOMP._IOwnership _out609;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out610;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out608, out _out609, out _out610);
+              r = _out608;
+              resultingOwnership = _out609;
+              readIdents = _out610;
+            }
+          } else if (_source125.is_Primitive) {
+            DAST._IPrimitive _2979___mcc_h504 = _source125.dtor_Primitive_a0;
+            {
+              RAST._IExpr _out611;
+              DCOMP._IOwnership _out612;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out613;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out611, out _out612, out _out613);
+              r = _out611;
+              resultingOwnership = _out612;
+              readIdents = _out613;
+            }
+          } else if (_source125.is_Passthrough) {
+            Dafny.ISequence<Dafny.Rune> _2980___mcc_h506 = _source125.dtor_Passthrough_a0;
+            {
+              RAST._IExpr _out614;
+              DCOMP._IOwnership _out615;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out616;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out614, out _out615, out _out616);
+              r = _out614;
+              resultingOwnership = _out615;
+              readIdents = _out616;
+            }
+          } else {
+            Dafny.ISequence<Dafny.Rune> _2981___mcc_h508 = _source125.dtor_TypeArg_a0;
+            {
+              RAST._IExpr _out617;
+              DCOMP._IOwnership _out618;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out619;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out617, out _out618, out _out619);
+              r = _out617;
+              resultingOwnership = _out618;
+              readIdents = _out619;
+            }
+          }
+        } else if (_source109.is_Multiset) {
+          DAST._IType _2982___mcc_h510 = _source109.dtor_element;
+          DAST._IType _source127 = _2704___mcc_h1;
+          if (_source127.is_Path) {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2983___mcc_h514 = _source127.dtor_Path_a0;
+            Dafny.ISequence<DAST._IType> _2984___mcc_h515 = _source127.dtor_typeArgs;
+            DAST._IResolvedType _2985___mcc_h516 = _source127.dtor_resolved;
+            DAST._IResolvedType _source128 = _2985___mcc_h516;
+            if (_source128.is_Datatype) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2986___mcc_h520 = _source128.dtor_path;
+              {
+                RAST._IExpr _out620;
+                DCOMP._IOwnership _out621;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out622;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out620, out _out621, out _out622);
+                r = _out620;
+                resultingOwnership = _out621;
+                readIdents = _out622;
+              }
+            } else if (_source128.is_Trait) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _2987___mcc_h522 = _source128.dtor_path;
+              {
+                RAST._IExpr _out623;
+                DCOMP._IOwnership _out624;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out625;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out623, out _out624, out _out625);
+                r = _out623;
+                resultingOwnership = _out624;
+                readIdents = _out625;
+              }
+            } else {
+              DAST._IType _2988___mcc_h524 = _source128.dtor_baseType;
+              DAST._INewtypeRange _2989___mcc_h525 = _source128.dtor_range;
+              bool _2990___mcc_h526 = _source128.dtor_erase;
+              bool _2991_erase = _2990___mcc_h526;
+              DAST._INewtypeRange _2992_range = _2989___mcc_h525;
+              DAST._IType _2993_b = _2988___mcc_h524;
+              {
+                RAST._IExpr _out626;
+                DCOMP._IOwnership _out627;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out628;
+                (this).GenExprConvertToNewtype(e, selfIdent, @params, expectedOwnership, out _out626, out _out627, out _out628);
+                r = _out626;
+                resultingOwnership = _out627;
+                readIdents = _out628;
+              }
+            }
+          } else if (_source127.is_Nullable) {
+            DAST._IType _2994___mcc_h530 = _source127.dtor_Nullable_a0;
+            {
+              RAST._IExpr _out629;
+              DCOMP._IOwnership _out630;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out631;
+              (this).GenExprConvertToNullable(e, selfIdent, @params, expectedOwnership, out _out629, out _out630, out _out631);
+              r = _out629;
+              resultingOwnership = _out630;
+              readIdents = _out631;
+            }
+          } else if (_source127.is_Tuple) {
+            Dafny.ISequence<DAST._IType> _2995___mcc_h532 = _source127.dtor_Tuple_a0;
+            {
+              RAST._IExpr _out632;
+              DCOMP._IOwnership _out633;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out634;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out632, out _out633, out _out634);
+              r = _out632;
+              resultingOwnership = _out633;
+              readIdents = _out634;
+            }
+          } else if (_source127.is_Array) {
+            DAST._IType _2996___mcc_h534 = _source127.dtor_element;
+            BigInteger _2997___mcc_h535 = _source127.dtor_dims;
+            {
+              RAST._IExpr _out635;
+              DCOMP._IOwnership _out636;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out637;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out635, out _out636, out _out637);
+              r = _out635;
+              resultingOwnership = _out636;
+              readIdents = _out637;
+            }
+          } else if (_source127.is_Seq) {
+            DAST._IType _2998___mcc_h538 = _source127.dtor_element;
+            {
+              RAST._IExpr _out638;
+              DCOMP._IOwnership _out639;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out640;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out638, out _out639, out _out640);
+              r = _out638;
+              resultingOwnership = _out639;
+              readIdents = _out640;
+            }
+          } else if (_source127.is_Set) {
+            DAST._IType _2999___mcc_h540 = _source127.dtor_element;
+            {
+              RAST._IExpr _out641;
+              DCOMP._IOwnership _out642;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out643;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out641, out _out642, out _out643);
+              r = _out641;
+              resultingOwnership = _out642;
+              readIdents = _out643;
+            }
+          } else if (_source127.is_Multiset) {
+            DAST._IType _3000___mcc_h542 = _source127.dtor_element;
+            {
+              RAST._IExpr _out644;
+              DCOMP._IOwnership _out645;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out646;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out644, out _out645, out _out646);
+              r = _out644;
+              resultingOwnership = _out645;
+              readIdents = _out646;
+            }
+          } else if (_source127.is_Map) {
+            DAST._IType _3001___mcc_h544 = _source127.dtor_key;
+            DAST._IType _3002___mcc_h545 = _source127.dtor_value;
+            {
+              RAST._IExpr _out647;
+              DCOMP._IOwnership _out648;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out649;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out647, out _out648, out _out649);
+              r = _out647;
+              resultingOwnership = _out648;
+              readIdents = _out649;
+            }
+          } else if (_source127.is_SetBuilder) {
+            DAST._IType _3003___mcc_h548 = _source127.dtor_element;
+            {
+              RAST._IExpr _out650;
+              DCOMP._IOwnership _out651;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out652;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out650, out _out651, out _out652);
+              r = _out650;
+              resultingOwnership = _out651;
+              readIdents = _out652;
+            }
+          } else if (_source127.is_MapBuilder) {
+            DAST._IType _3004___mcc_h550 = _source127.dtor_key;
+            DAST._IType _3005___mcc_h551 = _source127.dtor_value;
+            {
+              RAST._IExpr _out653;
+              DCOMP._IOwnership _out654;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out655;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out653, out _out654, out _out655);
+              r = _out653;
+              resultingOwnership = _out654;
+              readIdents = _out655;
+            }
+          } else if (_source127.is_Arrow) {
+            Dafny.ISequence<DAST._IType> _3006___mcc_h554 = _source127.dtor_args;
+            DAST._IType _3007___mcc_h555 = _source127.dtor_result;
+            {
+              RAST._IExpr _out656;
+              DCOMP._IOwnership _out657;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out658;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out656, out _out657, out _out658);
+              r = _out656;
+              resultingOwnership = _out657;
+              readIdents = _out658;
+            }
+          } else if (_source127.is_Primitive) {
+            DAST._IPrimitive _3008___mcc_h558 = _source127.dtor_Primitive_a0;
+            {
+              RAST._IExpr _out659;
+              DCOMP._IOwnership _out660;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out661;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out659, out _out660, out _out661);
+              r = _out659;
+              resultingOwnership = _out660;
+              readIdents = _out661;
+            }
+          } else if (_source127.is_Passthrough) {
+            Dafny.ISequence<Dafny.Rune> _3009___mcc_h560 = _source127.dtor_Passthrough_a0;
+            {
+              RAST._IExpr _out662;
+              DCOMP._IOwnership _out663;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out664;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out662, out _out663, out _out664);
+              r = _out662;
+              resultingOwnership = _out663;
+              readIdents = _out664;
+            }
+          } else {
+            Dafny.ISequence<Dafny.Rune> _3010___mcc_h562 = _source127.dtor_TypeArg_a0;
+            {
+              RAST._IExpr _out665;
+              DCOMP._IOwnership _out666;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out667;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out665, out _out666, out _out667);
+              r = _out665;
+              resultingOwnership = _out666;
+              readIdents = _out667;
+            }
+          }
+        } else if (_source109.is_Map) {
+          DAST._IType _3011___mcc_h564 = _source109.dtor_key;
+          DAST._IType _3012___mcc_h565 = _source109.dtor_value;
+          DAST._IType _source129 = _2704___mcc_h1;
+          if (_source129.is_Path) {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3013___mcc_h572 = _source129.dtor_Path_a0;
+            Dafny.ISequence<DAST._IType> _3014___mcc_h573 = _source129.dtor_typeArgs;
+            DAST._IResolvedType _3015___mcc_h574 = _source129.dtor_resolved;
+            DAST._IResolvedType _source130 = _3015___mcc_h574;
+            if (_source130.is_Datatype) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3016___mcc_h578 = _source130.dtor_path;
+              {
+                RAST._IExpr _out668;
+                DCOMP._IOwnership _out669;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out670;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out668, out _out669, out _out670);
+                r = _out668;
+                resultingOwnership = _out669;
+                readIdents = _out670;
+              }
+            } else if (_source130.is_Trait) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3017___mcc_h580 = _source130.dtor_path;
+              {
+                RAST._IExpr _out671;
+                DCOMP._IOwnership _out672;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out673;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out671, out _out672, out _out673);
+                r = _out671;
+                resultingOwnership = _out672;
+                readIdents = _out673;
+              }
+            } else {
+              DAST._IType _3018___mcc_h582 = _source130.dtor_baseType;
+              DAST._INewtypeRange _3019___mcc_h583 = _source130.dtor_range;
+              bool _3020___mcc_h584 = _source130.dtor_erase;
+              bool _3021_erase = _3020___mcc_h584;
+              DAST._INewtypeRange _3022_range = _3019___mcc_h583;
+              DAST._IType _3023_b = _3018___mcc_h582;
+              {
+                RAST._IExpr _out674;
+                DCOMP._IOwnership _out675;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out676;
+                (this).GenExprConvertToNewtype(e, selfIdent, @params, expectedOwnership, out _out674, out _out675, out _out676);
+                r = _out674;
+                resultingOwnership = _out675;
+                readIdents = _out676;
+              }
+            }
+          } else if (_source129.is_Nullable) {
+            DAST._IType _3024___mcc_h588 = _source129.dtor_Nullable_a0;
+            {
+              RAST._IExpr _out677;
+              DCOMP._IOwnership _out678;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out679;
+              (this).GenExprConvertToNullable(e, selfIdent, @params, expectedOwnership, out _out677, out _out678, out _out679);
+              r = _out677;
+              resultingOwnership = _out678;
+              readIdents = _out679;
+            }
+          } else if (_source129.is_Tuple) {
+            Dafny.ISequence<DAST._IType> _3025___mcc_h590 = _source129.dtor_Tuple_a0;
+            {
+              RAST._IExpr _out680;
+              DCOMP._IOwnership _out681;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out682;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out680, out _out681, out _out682);
+              r = _out680;
+              resultingOwnership = _out681;
+              readIdents = _out682;
+            }
+          } else if (_source129.is_Array) {
+            DAST._IType _3026___mcc_h592 = _source129.dtor_element;
+            BigInteger _3027___mcc_h593 = _source129.dtor_dims;
+            {
+              RAST._IExpr _out683;
+              DCOMP._IOwnership _out684;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out685;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out683, out _out684, out _out685);
+              r = _out683;
+              resultingOwnership = _out684;
+              readIdents = _out685;
+            }
+          } else if (_source129.is_Seq) {
+            DAST._IType _3028___mcc_h596 = _source129.dtor_element;
+            {
+              RAST._IExpr _out686;
+              DCOMP._IOwnership _out687;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out688;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out686, out _out687, out _out688);
+              r = _out686;
+              resultingOwnership = _out687;
+              readIdents = _out688;
+            }
+          } else if (_source129.is_Set) {
+            DAST._IType _3029___mcc_h598 = _source129.dtor_element;
+            {
+              RAST._IExpr _out689;
+              DCOMP._IOwnership _out690;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out691;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out689, out _out690, out _out691);
+              r = _out689;
+              resultingOwnership = _out690;
+              readIdents = _out691;
+            }
+          } else if (_source129.is_Multiset) {
+            DAST._IType _3030___mcc_h600 = _source129.dtor_element;
+            {
+              RAST._IExpr _out692;
+              DCOMP._IOwnership _out693;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out694;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out692, out _out693, out _out694);
+              r = _out692;
+              resultingOwnership = _out693;
+              readIdents = _out694;
+            }
+          } else if (_source129.is_Map) {
+            DAST._IType _3031___mcc_h602 = _source129.dtor_key;
+            DAST._IType _3032___mcc_h603 = _source129.dtor_value;
+            {
+              RAST._IExpr _out695;
+              DCOMP._IOwnership _out696;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out697;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out695, out _out696, out _out697);
+              r = _out695;
+              resultingOwnership = _out696;
+              readIdents = _out697;
+            }
+          } else if (_source129.is_SetBuilder) {
+            DAST._IType _3033___mcc_h606 = _source129.dtor_element;
+            {
+              RAST._IExpr _out698;
+              DCOMP._IOwnership _out699;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out700;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out698, out _out699, out _out700);
+              r = _out698;
+              resultingOwnership = _out699;
+              readIdents = _out700;
+            }
+          } else if (_source129.is_MapBuilder) {
+            DAST._IType _3034___mcc_h608 = _source129.dtor_key;
+            DAST._IType _3035___mcc_h609 = _source129.dtor_value;
+            {
+              RAST._IExpr _out701;
+              DCOMP._IOwnership _out702;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out703;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out701, out _out702, out _out703);
+              r = _out701;
+              resultingOwnership = _out702;
+              readIdents = _out703;
+            }
+          } else if (_source129.is_Arrow) {
+            Dafny.ISequence<DAST._IType> _3036___mcc_h612 = _source129.dtor_args;
+            DAST._IType _3037___mcc_h613 = _source129.dtor_result;
+            {
+              RAST._IExpr _out704;
+              DCOMP._IOwnership _out705;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out706;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out704, out _out705, out _out706);
+              r = _out704;
+              resultingOwnership = _out705;
+              readIdents = _out706;
+            }
+          } else if (_source129.is_Primitive) {
+            DAST._IPrimitive _3038___mcc_h616 = _source129.dtor_Primitive_a0;
+            {
+              RAST._IExpr _out707;
+              DCOMP._IOwnership _out708;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out709;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out707, out _out708, out _out709);
+              r = _out707;
+              resultingOwnership = _out708;
+              readIdents = _out709;
+            }
+          } else if (_source129.is_Passthrough) {
+            Dafny.ISequence<Dafny.Rune> _3039___mcc_h618 = _source129.dtor_Passthrough_a0;
+            {
+              RAST._IExpr _out710;
+              DCOMP._IOwnership _out711;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out712;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out710, out _out711, out _out712);
+              r = _out710;
+              resultingOwnership = _out711;
+              readIdents = _out712;
+            }
+          } else {
+            Dafny.ISequence<Dafny.Rune> _3040___mcc_h620 = _source129.dtor_TypeArg_a0;
+            {
+              RAST._IExpr _out713;
+              DCOMP._IOwnership _out714;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out715;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out713, out _out714, out _out715);
+              r = _out713;
+              resultingOwnership = _out714;
+              readIdents = _out715;
+            }
+          }
+        } else if (_source109.is_SetBuilder) {
+          DAST._IType _3041___mcc_h622 = _source109.dtor_element;
+          DAST._IType _source131 = _2704___mcc_h1;
+          if (_source131.is_Path) {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3042___mcc_h626 = _source131.dtor_Path_a0;
+            Dafny.ISequence<DAST._IType> _3043___mcc_h627 = _source131.dtor_typeArgs;
+            DAST._IResolvedType _3044___mcc_h628 = _source131.dtor_resolved;
+            DAST._IResolvedType _source132 = _3044___mcc_h628;
+            if (_source132.is_Datatype) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3045___mcc_h632 = _source132.dtor_path;
+              {
+                RAST._IExpr _out716;
+                DCOMP._IOwnership _out717;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out718;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out716, out _out717, out _out718);
+                r = _out716;
+                resultingOwnership = _out717;
+                readIdents = _out718;
+              }
+            } else if (_source132.is_Trait) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3046___mcc_h634 = _source132.dtor_path;
+              {
+                RAST._IExpr _out719;
+                DCOMP._IOwnership _out720;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out721;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out719, out _out720, out _out721);
+                r = _out719;
+                resultingOwnership = _out720;
+                readIdents = _out721;
+              }
+            } else {
+              DAST._IType _3047___mcc_h636 = _source132.dtor_baseType;
+              DAST._INewtypeRange _3048___mcc_h637 = _source132.dtor_range;
+              bool _3049___mcc_h638 = _source132.dtor_erase;
+              bool _3050_erase = _3049___mcc_h638;
+              DAST._INewtypeRange _3051_range = _3048___mcc_h637;
+              DAST._IType _3052_b = _3047___mcc_h636;
+              {
+                RAST._IExpr _out722;
+                DCOMP._IOwnership _out723;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out724;
+                (this).GenExprConvertToNewtype(e, selfIdent, @params, expectedOwnership, out _out722, out _out723, out _out724);
+                r = _out722;
+                resultingOwnership = _out723;
+                readIdents = _out724;
+              }
+            }
+          } else if (_source131.is_Nullable) {
+            DAST._IType _3053___mcc_h642 = _source131.dtor_Nullable_a0;
+            {
+              RAST._IExpr _out725;
+              DCOMP._IOwnership _out726;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out727;
+              (this).GenExprConvertToNullable(e, selfIdent, @params, expectedOwnership, out _out725, out _out726, out _out727);
+              r = _out725;
+              resultingOwnership = _out726;
+              readIdents = _out727;
+            }
+          } else if (_source131.is_Tuple) {
+            Dafny.ISequence<DAST._IType> _3054___mcc_h644 = _source131.dtor_Tuple_a0;
+            {
+              RAST._IExpr _out728;
+              DCOMP._IOwnership _out729;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out730;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out728, out _out729, out _out730);
+              r = _out728;
+              resultingOwnership = _out729;
+              readIdents = _out730;
+            }
+          } else if (_source131.is_Array) {
+            DAST._IType _3055___mcc_h646 = _source131.dtor_element;
+            BigInteger _3056___mcc_h647 = _source131.dtor_dims;
+            {
+              RAST._IExpr _out731;
+              DCOMP._IOwnership _out732;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out733;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out731, out _out732, out _out733);
+              r = _out731;
+              resultingOwnership = _out732;
+              readIdents = _out733;
+            }
+          } else if (_source131.is_Seq) {
+            DAST._IType _3057___mcc_h650 = _source131.dtor_element;
+            {
+              RAST._IExpr _out734;
+              DCOMP._IOwnership _out735;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out736;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out734, out _out735, out _out736);
+              r = _out734;
+              resultingOwnership = _out735;
+              readIdents = _out736;
+            }
+          } else if (_source131.is_Set) {
+            DAST._IType _3058___mcc_h652 = _source131.dtor_element;
+            {
+              RAST._IExpr _out737;
+              DCOMP._IOwnership _out738;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out739;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out737, out _out738, out _out739);
+              r = _out737;
+              resultingOwnership = _out738;
+              readIdents = _out739;
+            }
+          } else if (_source131.is_Multiset) {
+            DAST._IType _3059___mcc_h654 = _source131.dtor_element;
+            {
+              RAST._IExpr _out740;
+              DCOMP._IOwnership _out741;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out742;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out740, out _out741, out _out742);
+              r = _out740;
+              resultingOwnership = _out741;
+              readIdents = _out742;
+            }
+          } else if (_source131.is_Map) {
+            DAST._IType _3060___mcc_h656 = _source131.dtor_key;
+            DAST._IType _3061___mcc_h657 = _source131.dtor_value;
+            {
+              RAST._IExpr _out743;
+              DCOMP._IOwnership _out744;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out745;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out743, out _out744, out _out745);
+              r = _out743;
+              resultingOwnership = _out744;
+              readIdents = _out745;
+            }
+          } else if (_source131.is_SetBuilder) {
+            DAST._IType _3062___mcc_h660 = _source131.dtor_element;
+            {
+              RAST._IExpr _out746;
+              DCOMP._IOwnership _out747;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out748;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out746, out _out747, out _out748);
+              r = _out746;
+              resultingOwnership = _out747;
+              readIdents = _out748;
+            }
+          } else if (_source131.is_MapBuilder) {
+            DAST._IType _3063___mcc_h662 = _source131.dtor_key;
+            DAST._IType _3064___mcc_h663 = _source131.dtor_value;
+            {
+              RAST._IExpr _out749;
+              DCOMP._IOwnership _out750;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out751;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out749, out _out750, out _out751);
+              r = _out749;
+              resultingOwnership = _out750;
+              readIdents = _out751;
+            }
+          } else if (_source131.is_Arrow) {
+            Dafny.ISequence<DAST._IType> _3065___mcc_h666 = _source131.dtor_args;
+            DAST._IType _3066___mcc_h667 = _source131.dtor_result;
+            {
+              RAST._IExpr _out752;
+              DCOMP._IOwnership _out753;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out754;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out752, out _out753, out _out754);
+              r = _out752;
+              resultingOwnership = _out753;
+              readIdents = _out754;
+            }
+          } else if (_source131.is_Primitive) {
+            DAST._IPrimitive _3067___mcc_h670 = _source131.dtor_Primitive_a0;
+            {
+              RAST._IExpr _out755;
+              DCOMP._IOwnership _out756;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out757;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out755, out _out756, out _out757);
+              r = _out755;
+              resultingOwnership = _out756;
+              readIdents = _out757;
+            }
+          } else if (_source131.is_Passthrough) {
+            Dafny.ISequence<Dafny.Rune> _3068___mcc_h672 = _source131.dtor_Passthrough_a0;
+            {
+              RAST._IExpr _out758;
+              DCOMP._IOwnership _out759;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out760;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out758, out _out759, out _out760);
+              r = _out758;
+              resultingOwnership = _out759;
+              readIdents = _out760;
+            }
+          } else {
+            Dafny.ISequence<Dafny.Rune> _3069___mcc_h674 = _source131.dtor_TypeArg_a0;
+            {
+              RAST._IExpr _out761;
+              DCOMP._IOwnership _out762;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out763;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out761, out _out762, out _out763);
+              r = _out761;
+              resultingOwnership = _out762;
+              readIdents = _out763;
+            }
+          }
+        } else if (_source109.is_MapBuilder) {
+          DAST._IType _3070___mcc_h676 = _source109.dtor_key;
+          DAST._IType _3071___mcc_h677 = _source109.dtor_value;
+          DAST._IType _source133 = _2704___mcc_h1;
+          if (_source133.is_Path) {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3072___mcc_h684 = _source133.dtor_Path_a0;
+            Dafny.ISequence<DAST._IType> _3073___mcc_h685 = _source133.dtor_typeArgs;
+            DAST._IResolvedType _3074___mcc_h686 = _source133.dtor_resolved;
+            DAST._IResolvedType _source134 = _3074___mcc_h686;
+            if (_source134.is_Datatype) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3075___mcc_h690 = _source134.dtor_path;
+              {
+                RAST._IExpr _out764;
+                DCOMP._IOwnership _out765;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out766;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out764, out _out765, out _out766);
+                r = _out764;
+                resultingOwnership = _out765;
+                readIdents = _out766;
+              }
+            } else if (_source134.is_Trait) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3076___mcc_h692 = _source134.dtor_path;
+              {
+                RAST._IExpr _out767;
+                DCOMP._IOwnership _out768;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out769;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out767, out _out768, out _out769);
+                r = _out767;
+                resultingOwnership = _out768;
+                readIdents = _out769;
+              }
+            } else {
+              DAST._IType _3077___mcc_h694 = _source134.dtor_baseType;
+              DAST._INewtypeRange _3078___mcc_h695 = _source134.dtor_range;
+              bool _3079___mcc_h696 = _source134.dtor_erase;
+              bool _3080_erase = _3079___mcc_h696;
+              DAST._INewtypeRange _3081_range = _3078___mcc_h695;
+              DAST._IType _3082_b = _3077___mcc_h694;
+              {
+                RAST._IExpr _out770;
+                DCOMP._IOwnership _out771;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out772;
+                (this).GenExprConvertToNewtype(e, selfIdent, @params, expectedOwnership, out _out770, out _out771, out _out772);
+                r = _out770;
+                resultingOwnership = _out771;
+                readIdents = _out772;
+              }
+            }
+          } else if (_source133.is_Nullable) {
+            DAST._IType _3083___mcc_h700 = _source133.dtor_Nullable_a0;
+            {
+              RAST._IExpr _out773;
+              DCOMP._IOwnership _out774;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out775;
+              (this).GenExprConvertToNullable(e, selfIdent, @params, expectedOwnership, out _out773, out _out774, out _out775);
+              r = _out773;
+              resultingOwnership = _out774;
+              readIdents = _out775;
+            }
+          } else if (_source133.is_Tuple) {
+            Dafny.ISequence<DAST._IType> _3084___mcc_h702 = _source133.dtor_Tuple_a0;
+            {
+              RAST._IExpr _out776;
+              DCOMP._IOwnership _out777;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out778;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out776, out _out777, out _out778);
+              r = _out776;
+              resultingOwnership = _out777;
+              readIdents = _out778;
+            }
+          } else if (_source133.is_Array) {
+            DAST._IType _3085___mcc_h704 = _source133.dtor_element;
+            BigInteger _3086___mcc_h705 = _source133.dtor_dims;
+            {
+              RAST._IExpr _out779;
+              DCOMP._IOwnership _out780;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out781;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out779, out _out780, out _out781);
+              r = _out779;
+              resultingOwnership = _out780;
+              readIdents = _out781;
+            }
+          } else if (_source133.is_Seq) {
+            DAST._IType _3087___mcc_h708 = _source133.dtor_element;
+            {
+              RAST._IExpr _out782;
+              DCOMP._IOwnership _out783;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out784;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out782, out _out783, out _out784);
+              r = _out782;
+              resultingOwnership = _out783;
+              readIdents = _out784;
+            }
+          } else if (_source133.is_Set) {
+            DAST._IType _3088___mcc_h710 = _source133.dtor_element;
+            {
+              RAST._IExpr _out785;
+              DCOMP._IOwnership _out786;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out787;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out785, out _out786, out _out787);
+              r = _out785;
+              resultingOwnership = _out786;
+              readIdents = _out787;
+            }
+          } else if (_source133.is_Multiset) {
+            DAST._IType _3089___mcc_h712 = _source133.dtor_element;
+            {
+              RAST._IExpr _out788;
+              DCOMP._IOwnership _out789;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out790;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out788, out _out789, out _out790);
+              r = _out788;
+              resultingOwnership = _out789;
+              readIdents = _out790;
+            }
+          } else if (_source133.is_Map) {
+            DAST._IType _3090___mcc_h714 = _source133.dtor_key;
+            DAST._IType _3091___mcc_h715 = _source133.dtor_value;
+            {
+              RAST._IExpr _out791;
+              DCOMP._IOwnership _out792;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out793;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out791, out _out792, out _out793);
+              r = _out791;
+              resultingOwnership = _out792;
+              readIdents = _out793;
+            }
+          } else if (_source133.is_SetBuilder) {
+            DAST._IType _3092___mcc_h718 = _source133.dtor_element;
+            {
+              RAST._IExpr _out794;
+              DCOMP._IOwnership _out795;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out796;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out794, out _out795, out _out796);
+              r = _out794;
+              resultingOwnership = _out795;
+              readIdents = _out796;
+            }
+          } else if (_source133.is_MapBuilder) {
+            DAST._IType _3093___mcc_h720 = _source133.dtor_key;
+            DAST._IType _3094___mcc_h721 = _source133.dtor_value;
+            {
+              RAST._IExpr _out797;
+              DCOMP._IOwnership _out798;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out799;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out797, out _out798, out _out799);
+              r = _out797;
+              resultingOwnership = _out798;
+              readIdents = _out799;
+            }
+          } else if (_source133.is_Arrow) {
+            Dafny.ISequence<DAST._IType> _3095___mcc_h724 = _source133.dtor_args;
+            DAST._IType _3096___mcc_h725 = _source133.dtor_result;
+            {
+              RAST._IExpr _out800;
+              DCOMP._IOwnership _out801;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out802;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out800, out _out801, out _out802);
+              r = _out800;
+              resultingOwnership = _out801;
+              readIdents = _out802;
+            }
+          } else if (_source133.is_Primitive) {
+            DAST._IPrimitive _3097___mcc_h728 = _source133.dtor_Primitive_a0;
+            {
+              RAST._IExpr _out803;
+              DCOMP._IOwnership _out804;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out805;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out803, out _out804, out _out805);
+              r = _out803;
+              resultingOwnership = _out804;
+              readIdents = _out805;
+            }
+          } else if (_source133.is_Passthrough) {
+            Dafny.ISequence<Dafny.Rune> _3098___mcc_h730 = _source133.dtor_Passthrough_a0;
+            {
+              RAST._IExpr _out806;
+              DCOMP._IOwnership _out807;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out808;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out806, out _out807, out _out808);
+              r = _out806;
+              resultingOwnership = _out807;
+              readIdents = _out808;
+            }
+          } else {
+            Dafny.ISequence<Dafny.Rune> _3099___mcc_h732 = _source133.dtor_TypeArg_a0;
+            {
+              RAST._IExpr _out809;
+              DCOMP._IOwnership _out810;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out811;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out809, out _out810, out _out811);
+              r = _out809;
+              resultingOwnership = _out810;
+              readIdents = _out811;
+            }
+          }
+        } else if (_source109.is_Arrow) {
+          Dafny.ISequence<DAST._IType> _3100___mcc_h734 = _source109.dtor_args;
+          DAST._IType _3101___mcc_h735 = _source109.dtor_result;
+          DAST._IType _source135 = _2704___mcc_h1;
+          if (_source135.is_Path) {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3102___mcc_h742 = _source135.dtor_Path_a0;
+            Dafny.ISequence<DAST._IType> _3103___mcc_h743 = _source135.dtor_typeArgs;
+            DAST._IResolvedType _3104___mcc_h744 = _source135.dtor_resolved;
+            DAST._IResolvedType _source136 = _3104___mcc_h744;
+            if (_source136.is_Datatype) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3105___mcc_h748 = _source136.dtor_path;
+              {
+                RAST._IExpr _out812;
+                DCOMP._IOwnership _out813;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out814;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out812, out _out813, out _out814);
+                r = _out812;
+                resultingOwnership = _out813;
+                readIdents = _out814;
+              }
+            } else if (_source136.is_Trait) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3106___mcc_h750 = _source136.dtor_path;
+              {
+                RAST._IExpr _out815;
+                DCOMP._IOwnership _out816;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out817;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out815, out _out816, out _out817);
+                r = _out815;
+                resultingOwnership = _out816;
+                readIdents = _out817;
+              }
+            } else {
+              DAST._IType _3107___mcc_h752 = _source136.dtor_baseType;
+              DAST._INewtypeRange _3108___mcc_h753 = _source136.dtor_range;
+              bool _3109___mcc_h754 = _source136.dtor_erase;
+              bool _3110_erase = _3109___mcc_h754;
+              DAST._INewtypeRange _3111_range = _3108___mcc_h753;
+              DAST._IType _3112_b = _3107___mcc_h752;
+              {
+                RAST._IExpr _out818;
+                DCOMP._IOwnership _out819;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out820;
+                (this).GenExprConvertToNewtype(e, selfIdent, @params, expectedOwnership, out _out818, out _out819, out _out820);
+                r = _out818;
+                resultingOwnership = _out819;
+                readIdents = _out820;
+              }
+            }
+          } else if (_source135.is_Nullable) {
+            DAST._IType _3113___mcc_h758 = _source135.dtor_Nullable_a0;
+            {
+              RAST._IExpr _out821;
+              DCOMP._IOwnership _out822;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out823;
+              (this).GenExprConvertToNullable(e, selfIdent, @params, expectedOwnership, out _out821, out _out822, out _out823);
+              r = _out821;
+              resultingOwnership = _out822;
+              readIdents = _out823;
+            }
+          } else if (_source135.is_Tuple) {
+            Dafny.ISequence<DAST._IType> _3114___mcc_h760 = _source135.dtor_Tuple_a0;
+            {
+              RAST._IExpr _out824;
+              DCOMP._IOwnership _out825;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out826;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out824, out _out825, out _out826);
+              r = _out824;
+              resultingOwnership = _out825;
+              readIdents = _out826;
+            }
+          } else if (_source135.is_Array) {
+            DAST._IType _3115___mcc_h762 = _source135.dtor_element;
+            BigInteger _3116___mcc_h763 = _source135.dtor_dims;
+            {
+              RAST._IExpr _out827;
+              DCOMP._IOwnership _out828;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out829;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out827, out _out828, out _out829);
+              r = _out827;
+              resultingOwnership = _out828;
+              readIdents = _out829;
+            }
+          } else if (_source135.is_Seq) {
+            DAST._IType _3117___mcc_h766 = _source135.dtor_element;
+            {
+              RAST._IExpr _out830;
+              DCOMP._IOwnership _out831;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out832;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out830, out _out831, out _out832);
+              r = _out830;
+              resultingOwnership = _out831;
+              readIdents = _out832;
+            }
+          } else if (_source135.is_Set) {
+            DAST._IType _3118___mcc_h768 = _source135.dtor_element;
+            {
+              RAST._IExpr _out833;
+              DCOMP._IOwnership _out834;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out835;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out833, out _out834, out _out835);
+              r = _out833;
+              resultingOwnership = _out834;
+              readIdents = _out835;
+            }
+          } else if (_source135.is_Multiset) {
+            DAST._IType _3119___mcc_h770 = _source135.dtor_element;
+            {
+              RAST._IExpr _out836;
+              DCOMP._IOwnership _out837;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out838;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out836, out _out837, out _out838);
+              r = _out836;
+              resultingOwnership = _out837;
+              readIdents = _out838;
+            }
+          } else if (_source135.is_Map) {
+            DAST._IType _3120___mcc_h772 = _source135.dtor_key;
+            DAST._IType _3121___mcc_h773 = _source135.dtor_value;
+            {
+              RAST._IExpr _out839;
+              DCOMP._IOwnership _out840;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out841;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out839, out _out840, out _out841);
+              r = _out839;
+              resultingOwnership = _out840;
+              readIdents = _out841;
+            }
+          } else if (_source135.is_SetBuilder) {
+            DAST._IType _3122___mcc_h776 = _source135.dtor_element;
+            {
+              RAST._IExpr _out842;
+              DCOMP._IOwnership _out843;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out844;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out842, out _out843, out _out844);
+              r = _out842;
+              resultingOwnership = _out843;
+              readIdents = _out844;
+            }
+          } else if (_source135.is_MapBuilder) {
+            DAST._IType _3123___mcc_h778 = _source135.dtor_key;
+            DAST._IType _3124___mcc_h779 = _source135.dtor_value;
+            {
+              RAST._IExpr _out845;
+              DCOMP._IOwnership _out846;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out847;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out845, out _out846, out _out847);
+              r = _out845;
+              resultingOwnership = _out846;
+              readIdents = _out847;
+            }
+          } else if (_source135.is_Arrow) {
+            Dafny.ISequence<DAST._IType> _3125___mcc_h782 = _source135.dtor_args;
+            DAST._IType _3126___mcc_h783 = _source135.dtor_result;
+            {
+              RAST._IExpr _out848;
+              DCOMP._IOwnership _out849;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out850;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out848, out _out849, out _out850);
+              r = _out848;
+              resultingOwnership = _out849;
+              readIdents = _out850;
+            }
+          } else if (_source135.is_Primitive) {
+            DAST._IPrimitive _3127___mcc_h786 = _source135.dtor_Primitive_a0;
+            {
+              RAST._IExpr _out851;
+              DCOMP._IOwnership _out852;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out853;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out851, out _out852, out _out853);
+              r = _out851;
+              resultingOwnership = _out852;
+              readIdents = _out853;
+            }
+          } else if (_source135.is_Passthrough) {
+            Dafny.ISequence<Dafny.Rune> _3128___mcc_h788 = _source135.dtor_Passthrough_a0;
+            {
+              RAST._IExpr _out854;
+              DCOMP._IOwnership _out855;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out856;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out854, out _out855, out _out856);
+              r = _out854;
+              resultingOwnership = _out855;
+              readIdents = _out856;
+            }
+          } else {
+            Dafny.ISequence<Dafny.Rune> _3129___mcc_h790 = _source135.dtor_TypeArg_a0;
+            {
+              RAST._IExpr _out857;
+              DCOMP._IOwnership _out858;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out859;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out857, out _out858, out _out859);
+              r = _out857;
+              resultingOwnership = _out858;
+              readIdents = _out859;
+            }
+          }
+        } else if (_source109.is_Primitive) {
+          DAST._IPrimitive _3130___mcc_h792 = _source109.dtor_Primitive_a0;
+          DAST._IPrimitive _source137 = _3130___mcc_h792;
+          if (_source137.is_Int) {
+            DAST._IType _source138 = _2704___mcc_h1;
+            if (_source138.is_Path) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3131___mcc_h796 = _source138.dtor_Path_a0;
+              Dafny.ISequence<DAST._IType> _3132___mcc_h797 = _source138.dtor_typeArgs;
+              DAST._IResolvedType _3133___mcc_h798 = _source138.dtor_resolved;
+              DAST._IResolvedType _source139 = _3133___mcc_h798;
+              if (_source139.is_Datatype) {
+                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3134___mcc_h802 = _source139.dtor_path;
+                {
+                  RAST._IExpr _out860;
+                  DCOMP._IOwnership _out861;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out862;
+                  (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out860, out _out861, out _out862);
+                  r = _out860;
+                  resultingOwnership = _out861;
+                  readIdents = _out862;
+                }
+              } else if (_source139.is_Trait) {
+                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3135___mcc_h804 = _source139.dtor_path;
+                {
+                  RAST._IExpr _out863;
+                  DCOMP._IOwnership _out864;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out865;
+                  (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out863, out _out864, out _out865);
+                  r = _out863;
+                  resultingOwnership = _out864;
+                  readIdents = _out865;
+                }
+              } else {
+                DAST._IType _3136___mcc_h806 = _source139.dtor_baseType;
+                DAST._INewtypeRange _3137___mcc_h807 = _source139.dtor_range;
+                bool _3138___mcc_h808 = _source139.dtor_erase;
+                bool _3139_erase = _3138___mcc_h808;
+                DAST._INewtypeRange _3140_range = _3137___mcc_h807;
+                DAST._IType _3141_b = _3136___mcc_h806;
+                {
+                  RAST._IExpr _out866;
+                  DCOMP._IOwnership _out867;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out868;
+                  (this).GenExprConvertToNewtype(e, selfIdent, @params, expectedOwnership, out _out866, out _out867, out _out868);
+                  r = _out866;
+                  resultingOwnership = _out867;
+                  readIdents = _out868;
+                }
+              }
+            } else if (_source138.is_Nullable) {
+              DAST._IType _3142___mcc_h812 = _source138.dtor_Nullable_a0;
+              {
+                RAST._IExpr _out869;
+                DCOMP._IOwnership _out870;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out871;
+                (this).GenExprConvertToNullable(e, selfIdent, @params, expectedOwnership, out _out869, out _out870, out _out871);
+                r = _out869;
+                resultingOwnership = _out870;
+                readIdents = _out871;
+              }
+            } else if (_source138.is_Tuple) {
+              Dafny.ISequence<DAST._IType> _3143___mcc_h814 = _source138.dtor_Tuple_a0;
+              {
+                RAST._IExpr _out872;
+                DCOMP._IOwnership _out873;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out874;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out872, out _out873, out _out874);
+                r = _out872;
+                resultingOwnership = _out873;
+                readIdents = _out874;
+              }
+            } else if (_source138.is_Array) {
+              DAST._IType _3144___mcc_h816 = _source138.dtor_element;
+              BigInteger _3145___mcc_h817 = _source138.dtor_dims;
+              {
+                RAST._IExpr _out875;
+                DCOMP._IOwnership _out876;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out877;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out875, out _out876, out _out877);
+                r = _out875;
+                resultingOwnership = _out876;
+                readIdents = _out877;
+              }
+            } else if (_source138.is_Seq) {
+              DAST._IType _3146___mcc_h820 = _source138.dtor_element;
+              {
+                RAST._IExpr _out878;
+                DCOMP._IOwnership _out879;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out880;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out878, out _out879, out _out880);
+                r = _out878;
+                resultingOwnership = _out879;
+                readIdents = _out880;
+              }
+            } else if (_source138.is_Set) {
+              DAST._IType _3147___mcc_h822 = _source138.dtor_element;
+              {
+                RAST._IExpr _out881;
+                DCOMP._IOwnership _out882;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out883;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out881, out _out882, out _out883);
+                r = _out881;
+                resultingOwnership = _out882;
+                readIdents = _out883;
+              }
+            } else if (_source138.is_Multiset) {
+              DAST._IType _3148___mcc_h824 = _source138.dtor_element;
+              {
+                RAST._IExpr _out884;
+                DCOMP._IOwnership _out885;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out886;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out884, out _out885, out _out886);
+                r = _out884;
+                resultingOwnership = _out885;
+                readIdents = _out886;
+              }
+            } else if (_source138.is_Map) {
+              DAST._IType _3149___mcc_h826 = _source138.dtor_key;
+              DAST._IType _3150___mcc_h827 = _source138.dtor_value;
+              {
+                RAST._IExpr _out887;
+                DCOMP._IOwnership _out888;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out889;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out887, out _out888, out _out889);
+                r = _out887;
+                resultingOwnership = _out888;
+                readIdents = _out889;
+              }
+            } else if (_source138.is_SetBuilder) {
+              DAST._IType _3151___mcc_h830 = _source138.dtor_element;
+              {
+                RAST._IExpr _out890;
+                DCOMP._IOwnership _out891;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out892;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out890, out _out891, out _out892);
+                r = _out890;
+                resultingOwnership = _out891;
+                readIdents = _out892;
+              }
+            } else if (_source138.is_MapBuilder) {
+              DAST._IType _3152___mcc_h832 = _source138.dtor_key;
+              DAST._IType _3153___mcc_h833 = _source138.dtor_value;
+              {
+                RAST._IExpr _out893;
+                DCOMP._IOwnership _out894;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out895;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out893, out _out894, out _out895);
+                r = _out893;
+                resultingOwnership = _out894;
+                readIdents = _out895;
+              }
+            } else if (_source138.is_Arrow) {
+              Dafny.ISequence<DAST._IType> _3154___mcc_h836 = _source138.dtor_args;
+              DAST._IType _3155___mcc_h837 = _source138.dtor_result;
+              {
+                RAST._IExpr _out896;
+                DCOMP._IOwnership _out897;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out898;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out896, out _out897, out _out898);
+                r = _out896;
+                resultingOwnership = _out897;
+                readIdents = _out898;
+              }
+            } else if (_source138.is_Primitive) {
+              DAST._IPrimitive _3156___mcc_h840 = _source138.dtor_Primitive_a0;
+              DAST._IPrimitive _source140 = _3156___mcc_h840;
+              if (_source140.is_Int) {
+                {
+                  RAST._IExpr _out899;
+                  DCOMP._IOwnership _out900;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out901;
+                  (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out899, out _out900, out _out901);
+                  r = _out899;
+                  resultingOwnership = _out900;
+                  readIdents = _out901;
+                }
+              } else if (_source140.is_Real) {
+                {
+                  RAST._IExpr _3157_recursiveGen;
+                  DCOMP._IOwnership _3158___v74;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3159_recIdents;
+                  RAST._IExpr _out902;
+                  DCOMP._IOwnership _out903;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out904;
+                  (this).GenExpr(_2697_expr, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out902, out _out903, out _out904);
+                  _3157_recursiveGen = _out902;
+                  _3158___v74 = _out903;
+                  _3159_recIdents = _out904;
+                  r = RAST.__default.RcNew(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::BigRational::from_integer("), (_3157_recursiveGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"))));
+                  RAST._IExpr _out905;
+                  DCOMP._IOwnership _out906;
+                  DCOMP.COMP.FromOwned(r, expectedOwnership, out _out905, out _out906);
+                  r = _out905;
+                  resultingOwnership = _out906;
+                  readIdents = _3159_recIdents;
+                }
+              } else if (_source140.is_String) {
+                {
+                  RAST._IExpr _out907;
+                  DCOMP._IOwnership _out908;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out909;
+                  (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out907, out _out908, out _out909);
+                  r = _out907;
+                  resultingOwnership = _out908;
+                  readIdents = _out909;
+                }
+              } else if (_source140.is_Bool) {
+                {
+                  RAST._IExpr _out910;
+                  DCOMP._IOwnership _out911;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out912;
+                  (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out910, out _out911, out _out912);
+                  r = _out910;
+                  resultingOwnership = _out911;
+                  readIdents = _out912;
+                }
+              } else {
+                {
+                  RAST._IType _3160_rhsType;
+                  RAST._IType _out913;
+                  _out913 = (this).GenType(_2699_toTpe, true, false);
+                  _3160_rhsType = _out913;
+                  RAST._IExpr _3161_recursiveGen;
+                  DCOMP._IOwnership _3162___v80;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3163_recIdents;
+                  RAST._IExpr _out914;
+                  DCOMP._IOwnership _out915;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out916;
+                  (this).GenExpr(_2697_expr, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out914, out _out915, out _out916);
+                  _3161_recursiveGen = _out914;
+                  _3162___v80 = _out915;
+                  _3163_recIdents = _out916;
+                  r = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("char::from_u32(<u32 as ::dafny_runtime::NumCast>::from("), (_3161_recursiveGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").unwrap()).unwrap()")));
+                  RAST._IExpr _out917;
+                  DCOMP._IOwnership _out918;
+                  DCOMP.COMP.FromOwned(r, expectedOwnership, out _out917, out _out918);
+                  r = _out917;
+                  resultingOwnership = _out918;
+                  readIdents = _3163_recIdents;
+                }
+              }
+            } else if (_source138.is_Passthrough) {
+              Dafny.ISequence<Dafny.Rune> _3164___mcc_h842 = _source138.dtor_Passthrough_a0;
+              {
+                RAST._IType _3165_rhsType;
+                RAST._IType _out919;
+                _out919 = (this).GenType(_2699_toTpe, true, false);
+                _3165_rhsType = _out919;
+                RAST._IExpr _3166_recursiveGen;
+                DCOMP._IOwnership _3167___v77;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3168_recIdents;
+                RAST._IExpr _out920;
+                DCOMP._IOwnership _out921;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out922;
+                (this).GenExpr(_2697_expr, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out920, out _out921, out _out922);
+                _3166_recursiveGen = _out920;
+                _3167___v77 = _out921;
+                _3168_recIdents = _out922;
+                r = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), (_3165_rhsType)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ::dafny_runtime::NumCast>::from(")), (_3166_recursiveGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").unwrap()")));
+                RAST._IExpr _out923;
+                DCOMP._IOwnership _out924;
+                DCOMP.COMP.FromOwned(r, expectedOwnership, out _out923, out _out924);
+                r = _out923;
+                resultingOwnership = _out924;
+                readIdents = _3168_recIdents;
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3169___mcc_h844 = _source138.dtor_TypeArg_a0;
+              {
+                RAST._IExpr _out925;
+                DCOMP._IOwnership _out926;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out927;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out925, out _out926, out _out927);
+                r = _out925;
+                resultingOwnership = _out926;
+                readIdents = _out927;
+              }
+            }
+          } else if (_source137.is_Real) {
+            DAST._IType _source141 = _2704___mcc_h1;
+            if (_source141.is_Path) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3170___mcc_h846 = _source141.dtor_Path_a0;
+              Dafny.ISequence<DAST._IType> _3171___mcc_h847 = _source141.dtor_typeArgs;
+              DAST._IResolvedType _3172___mcc_h848 = _source141.dtor_resolved;
+              DAST._IResolvedType _source142 = _3172___mcc_h848;
+              if (_source142.is_Datatype) {
+                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3173___mcc_h852 = _source142.dtor_path;
+                {
+                  RAST._IExpr _out928;
+                  DCOMP._IOwnership _out929;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out930;
+                  (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out928, out _out929, out _out930);
+                  r = _out928;
+                  resultingOwnership = _out929;
+                  readIdents = _out930;
+                }
+              } else if (_source142.is_Trait) {
+                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3174___mcc_h854 = _source142.dtor_path;
+                {
+                  RAST._IExpr _out931;
+                  DCOMP._IOwnership _out932;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out933;
+                  (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out931, out _out932, out _out933);
+                  r = _out931;
+                  resultingOwnership = _out932;
+                  readIdents = _out933;
+                }
+              } else {
+                DAST._IType _3175___mcc_h856 = _source142.dtor_baseType;
+                DAST._INewtypeRange _3176___mcc_h857 = _source142.dtor_range;
+                bool _3177___mcc_h858 = _source142.dtor_erase;
+                bool _3178_erase = _3177___mcc_h858;
+                DAST._INewtypeRange _3179_range = _3176___mcc_h857;
+                DAST._IType _3180_b = _3175___mcc_h856;
+                {
+                  RAST._IExpr _out934;
+                  DCOMP._IOwnership _out935;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out936;
+                  (this).GenExprConvertToNewtype(e, selfIdent, @params, expectedOwnership, out _out934, out _out935, out _out936);
+                  r = _out934;
+                  resultingOwnership = _out935;
+                  readIdents = _out936;
+                }
+              }
+            } else if (_source141.is_Nullable) {
+              DAST._IType _3181___mcc_h862 = _source141.dtor_Nullable_a0;
+              {
+                RAST._IExpr _out937;
+                DCOMP._IOwnership _out938;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out939;
+                (this).GenExprConvertToNullable(e, selfIdent, @params, expectedOwnership, out _out937, out _out938, out _out939);
+                r = _out937;
+                resultingOwnership = _out938;
+                readIdents = _out939;
+              }
+            } else if (_source141.is_Tuple) {
+              Dafny.ISequence<DAST._IType> _3182___mcc_h864 = _source141.dtor_Tuple_a0;
+              {
+                RAST._IExpr _out940;
+                DCOMP._IOwnership _out941;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out942;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out940, out _out941, out _out942);
+                r = _out940;
+                resultingOwnership = _out941;
+                readIdents = _out942;
+              }
+            } else if (_source141.is_Array) {
+              DAST._IType _3183___mcc_h866 = _source141.dtor_element;
+              BigInteger _3184___mcc_h867 = _source141.dtor_dims;
+              {
+                RAST._IExpr _out943;
+                DCOMP._IOwnership _out944;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out945;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out943, out _out944, out _out945);
+                r = _out943;
+                resultingOwnership = _out944;
+                readIdents = _out945;
+              }
+            } else if (_source141.is_Seq) {
+              DAST._IType _3185___mcc_h870 = _source141.dtor_element;
+              {
+                RAST._IExpr _out946;
+                DCOMP._IOwnership _out947;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out948;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out946, out _out947, out _out948);
+                r = _out946;
+                resultingOwnership = _out947;
+                readIdents = _out948;
+              }
+            } else if (_source141.is_Set) {
+              DAST._IType _3186___mcc_h872 = _source141.dtor_element;
+              {
+                RAST._IExpr _out949;
+                DCOMP._IOwnership _out950;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out951;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out949, out _out950, out _out951);
+                r = _out949;
+                resultingOwnership = _out950;
+                readIdents = _out951;
+              }
+            } else if (_source141.is_Multiset) {
+              DAST._IType _3187___mcc_h874 = _source141.dtor_element;
+              {
+                RAST._IExpr _out952;
+                DCOMP._IOwnership _out953;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out954;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out952, out _out953, out _out954);
+                r = _out952;
+                resultingOwnership = _out953;
+                readIdents = _out954;
+              }
+            } else if (_source141.is_Map) {
+              DAST._IType _3188___mcc_h876 = _source141.dtor_key;
+              DAST._IType _3189___mcc_h877 = _source141.dtor_value;
+              {
+                RAST._IExpr _out955;
+                DCOMP._IOwnership _out956;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out957;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out955, out _out956, out _out957);
+                r = _out955;
+                resultingOwnership = _out956;
+                readIdents = _out957;
+              }
+            } else if (_source141.is_SetBuilder) {
+              DAST._IType _3190___mcc_h880 = _source141.dtor_element;
+              {
+                RAST._IExpr _out958;
+                DCOMP._IOwnership _out959;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out960;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out958, out _out959, out _out960);
+                r = _out958;
+                resultingOwnership = _out959;
+                readIdents = _out960;
+              }
+            } else if (_source141.is_MapBuilder) {
+              DAST._IType _3191___mcc_h882 = _source141.dtor_key;
+              DAST._IType _3192___mcc_h883 = _source141.dtor_value;
+              {
+                RAST._IExpr _out961;
+                DCOMP._IOwnership _out962;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out963;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out961, out _out962, out _out963);
+                r = _out961;
+                resultingOwnership = _out962;
+                readIdents = _out963;
+              }
+            } else if (_source141.is_Arrow) {
+              Dafny.ISequence<DAST._IType> _3193___mcc_h886 = _source141.dtor_args;
+              DAST._IType _3194___mcc_h887 = _source141.dtor_result;
+              {
+                RAST._IExpr _out964;
+                DCOMP._IOwnership _out965;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out966;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out964, out _out965, out _out966);
+                r = _out964;
+                resultingOwnership = _out965;
+                readIdents = _out966;
+              }
+            } else if (_source141.is_Primitive) {
+              DAST._IPrimitive _3195___mcc_h890 = _source141.dtor_Primitive_a0;
+              DAST._IPrimitive _source143 = _3195___mcc_h890;
+              if (_source143.is_Int) {
+                {
+                  RAST._IExpr _3196_recursiveGen;
+                  DCOMP._IOwnership _3197___v75;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3198_recIdents;
+                  RAST._IExpr _out967;
+                  DCOMP._IOwnership _out968;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out969;
+                  (this).GenExpr(_2697_expr, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out967, out _out968, out _out969);
+                  _3196_recursiveGen = _out967;
+                  _3197___v75 = _out968;
+                  _3198_recIdents = _out969;
+                  r = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::dafny_rational_to_int("), (_3196_recursiveGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")));
+                  RAST._IExpr _out970;
+                  DCOMP._IOwnership _out971;
+                  DCOMP.COMP.FromOwned(r, expectedOwnership, out _out970, out _out971);
+                  r = _out970;
+                  resultingOwnership = _out971;
+                  readIdents = _3198_recIdents;
+                }
+              } else if (_source143.is_Real) {
+                {
+                  RAST._IExpr _out972;
+                  DCOMP._IOwnership _out973;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out974;
+                  (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out972, out _out973, out _out974);
+                  r = _out972;
+                  resultingOwnership = _out973;
+                  readIdents = _out974;
+                }
+              } else if (_source143.is_String) {
+                {
+                  RAST._IExpr _out975;
+                  DCOMP._IOwnership _out976;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out977;
+                  (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out975, out _out976, out _out977);
+                  r = _out975;
+                  resultingOwnership = _out976;
+                  readIdents = _out977;
+                }
+              } else if (_source143.is_Bool) {
+                {
+                  RAST._IExpr _out978;
+                  DCOMP._IOwnership _out979;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out980;
+                  (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out978, out _out979, out _out980);
+                  r = _out978;
+                  resultingOwnership = _out979;
+                  readIdents = _out980;
+                }
+              } else {
+                {
+                  RAST._IExpr _out981;
+                  DCOMP._IOwnership _out982;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out983;
+                  (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out981, out _out982, out _out983);
+                  r = _out981;
+                  resultingOwnership = _out982;
+                  readIdents = _out983;
+                }
+              }
+            } else if (_source141.is_Passthrough) {
+              Dafny.ISequence<Dafny.Rune> _3199___mcc_h892 = _source141.dtor_Passthrough_a0;
+              {
+                RAST._IExpr _out984;
+                DCOMP._IOwnership _out985;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out986;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out984, out _out985, out _out986);
+                r = _out984;
+                resultingOwnership = _out985;
+                readIdents = _out986;
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3200___mcc_h894 = _source141.dtor_TypeArg_a0;
+              {
+                RAST._IExpr _out987;
+                DCOMP._IOwnership _out988;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out989;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out987, out _out988, out _out989);
+                r = _out987;
+                resultingOwnership = _out988;
+                readIdents = _out989;
+              }
+            }
+          } else if (_source137.is_String) {
+            DAST._IType _source144 = _2704___mcc_h1;
+            if (_source144.is_Path) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3201___mcc_h896 = _source144.dtor_Path_a0;
+              Dafny.ISequence<DAST._IType> _3202___mcc_h897 = _source144.dtor_typeArgs;
+              DAST._IResolvedType _3203___mcc_h898 = _source144.dtor_resolved;
+              DAST._IResolvedType _source145 = _3203___mcc_h898;
+              if (_source145.is_Datatype) {
+                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3204___mcc_h902 = _source145.dtor_path;
+                {
+                  RAST._IExpr _out990;
+                  DCOMP._IOwnership _out991;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out992;
+                  (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out990, out _out991, out _out992);
+                  r = _out990;
+                  resultingOwnership = _out991;
+                  readIdents = _out992;
+                }
+              } else if (_source145.is_Trait) {
+                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3205___mcc_h904 = _source145.dtor_path;
+                {
+                  RAST._IExpr _out993;
+                  DCOMP._IOwnership _out994;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out995;
+                  (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out993, out _out994, out _out995);
+                  r = _out993;
+                  resultingOwnership = _out994;
+                  readIdents = _out995;
+                }
+              } else {
+                DAST._IType _3206___mcc_h906 = _source145.dtor_baseType;
+                DAST._INewtypeRange _3207___mcc_h907 = _source145.dtor_range;
+                bool _3208___mcc_h908 = _source145.dtor_erase;
+                bool _3209_erase = _3208___mcc_h908;
+                DAST._INewtypeRange _3210_range = _3207___mcc_h907;
+                DAST._IType _3211_b = _3206___mcc_h906;
+                {
+                  RAST._IExpr _out996;
+                  DCOMP._IOwnership _out997;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out998;
+                  (this).GenExprConvertToNewtype(e, selfIdent, @params, expectedOwnership, out _out996, out _out997, out _out998);
+                  r = _out996;
+                  resultingOwnership = _out997;
+                  readIdents = _out998;
+                }
+              }
+            } else if (_source144.is_Nullable) {
+              DAST._IType _3212___mcc_h912 = _source144.dtor_Nullable_a0;
+              {
+                RAST._IExpr _out999;
+                DCOMP._IOwnership _out1000;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1001;
+                (this).GenExprConvertToNullable(e, selfIdent, @params, expectedOwnership, out _out999, out _out1000, out _out1001);
+                r = _out999;
+                resultingOwnership = _out1000;
+                readIdents = _out1001;
+              }
+            } else if (_source144.is_Tuple) {
+              Dafny.ISequence<DAST._IType> _3213___mcc_h914 = _source144.dtor_Tuple_a0;
+              {
+                RAST._IExpr _out1002;
+                DCOMP._IOwnership _out1003;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1004;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1002, out _out1003, out _out1004);
+                r = _out1002;
+                resultingOwnership = _out1003;
+                readIdents = _out1004;
+              }
+            } else if (_source144.is_Array) {
+              DAST._IType _3214___mcc_h916 = _source144.dtor_element;
+              BigInteger _3215___mcc_h917 = _source144.dtor_dims;
+              {
+                RAST._IExpr _out1005;
+                DCOMP._IOwnership _out1006;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1007;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1005, out _out1006, out _out1007);
+                r = _out1005;
+                resultingOwnership = _out1006;
+                readIdents = _out1007;
+              }
+            } else if (_source144.is_Seq) {
+              DAST._IType _3216___mcc_h920 = _source144.dtor_element;
+              {
+                RAST._IExpr _out1008;
+                DCOMP._IOwnership _out1009;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1010;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1008, out _out1009, out _out1010);
+                r = _out1008;
+                resultingOwnership = _out1009;
+                readIdents = _out1010;
+              }
+            } else if (_source144.is_Set) {
+              DAST._IType _3217___mcc_h922 = _source144.dtor_element;
+              {
+                RAST._IExpr _out1011;
+                DCOMP._IOwnership _out1012;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1013;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1011, out _out1012, out _out1013);
+                r = _out1011;
+                resultingOwnership = _out1012;
+                readIdents = _out1013;
+              }
+            } else if (_source144.is_Multiset) {
+              DAST._IType _3218___mcc_h924 = _source144.dtor_element;
+              {
+                RAST._IExpr _out1014;
+                DCOMP._IOwnership _out1015;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1016;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1014, out _out1015, out _out1016);
+                r = _out1014;
+                resultingOwnership = _out1015;
+                readIdents = _out1016;
+              }
+            } else if (_source144.is_Map) {
+              DAST._IType _3219___mcc_h926 = _source144.dtor_key;
+              DAST._IType _3220___mcc_h927 = _source144.dtor_value;
+              {
+                RAST._IExpr _out1017;
+                DCOMP._IOwnership _out1018;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1019;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1017, out _out1018, out _out1019);
+                r = _out1017;
+                resultingOwnership = _out1018;
+                readIdents = _out1019;
+              }
+            } else if (_source144.is_SetBuilder) {
+              DAST._IType _3221___mcc_h930 = _source144.dtor_element;
+              {
+                RAST._IExpr _out1020;
+                DCOMP._IOwnership _out1021;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1022;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1020, out _out1021, out _out1022);
+                r = _out1020;
+                resultingOwnership = _out1021;
+                readIdents = _out1022;
+              }
+            } else if (_source144.is_MapBuilder) {
+              DAST._IType _3222___mcc_h932 = _source144.dtor_key;
+              DAST._IType _3223___mcc_h933 = _source144.dtor_value;
+              {
+                RAST._IExpr _out1023;
+                DCOMP._IOwnership _out1024;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1025;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1023, out _out1024, out _out1025);
+                r = _out1023;
+                resultingOwnership = _out1024;
+                readIdents = _out1025;
+              }
+            } else if (_source144.is_Arrow) {
+              Dafny.ISequence<DAST._IType> _3224___mcc_h936 = _source144.dtor_args;
+              DAST._IType _3225___mcc_h937 = _source144.dtor_result;
+              {
+                RAST._IExpr _out1026;
+                DCOMP._IOwnership _out1027;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1028;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1026, out _out1027, out _out1028);
+                r = _out1026;
+                resultingOwnership = _out1027;
+                readIdents = _out1028;
+              }
+            } else if (_source144.is_Primitive) {
+              DAST._IPrimitive _3226___mcc_h940 = _source144.dtor_Primitive_a0;
+              {
+                RAST._IExpr _out1029;
+                DCOMP._IOwnership _out1030;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1031;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1029, out _out1030, out _out1031);
+                r = _out1029;
+                resultingOwnership = _out1030;
+                readIdents = _out1031;
+              }
+            } else if (_source144.is_Passthrough) {
+              Dafny.ISequence<Dafny.Rune> _3227___mcc_h942 = _source144.dtor_Passthrough_a0;
+              {
+                RAST._IExpr _out1032;
+                DCOMP._IOwnership _out1033;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1034;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1032, out _out1033, out _out1034);
+                r = _out1032;
+                resultingOwnership = _out1033;
+                readIdents = _out1034;
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3228___mcc_h944 = _source144.dtor_TypeArg_a0;
+              {
+                RAST._IExpr _out1035;
+                DCOMP._IOwnership _out1036;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1037;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1035, out _out1036, out _out1037);
+                r = _out1035;
+                resultingOwnership = _out1036;
+                readIdents = _out1037;
+              }
+            }
+          } else if (_source137.is_Bool) {
+            DAST._IType _source146 = _2704___mcc_h1;
+            if (_source146.is_Path) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3229___mcc_h946 = _source146.dtor_Path_a0;
+              Dafny.ISequence<DAST._IType> _3230___mcc_h947 = _source146.dtor_typeArgs;
+              DAST._IResolvedType _3231___mcc_h948 = _source146.dtor_resolved;
+              DAST._IResolvedType _source147 = _3231___mcc_h948;
+              if (_source147.is_Datatype) {
+                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3232___mcc_h952 = _source147.dtor_path;
+                {
+                  RAST._IExpr _out1038;
+                  DCOMP._IOwnership _out1039;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1040;
+                  (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1038, out _out1039, out _out1040);
+                  r = _out1038;
+                  resultingOwnership = _out1039;
+                  readIdents = _out1040;
+                }
+              } else if (_source147.is_Trait) {
+                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3233___mcc_h954 = _source147.dtor_path;
+                {
+                  RAST._IExpr _out1041;
+                  DCOMP._IOwnership _out1042;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1043;
+                  (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1041, out _out1042, out _out1043);
+                  r = _out1041;
+                  resultingOwnership = _out1042;
+                  readIdents = _out1043;
+                }
+              } else {
+                DAST._IType _3234___mcc_h956 = _source147.dtor_baseType;
+                DAST._INewtypeRange _3235___mcc_h957 = _source147.dtor_range;
+                bool _3236___mcc_h958 = _source147.dtor_erase;
+                bool _3237_erase = _3236___mcc_h958;
+                DAST._INewtypeRange _3238_range = _3235___mcc_h957;
+                DAST._IType _3239_b = _3234___mcc_h956;
+                {
+                  RAST._IExpr _out1044;
+                  DCOMP._IOwnership _out1045;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1046;
+                  (this).GenExprConvertToNewtype(e, selfIdent, @params, expectedOwnership, out _out1044, out _out1045, out _out1046);
+                  r = _out1044;
+                  resultingOwnership = _out1045;
+                  readIdents = _out1046;
+                }
+              }
+            } else if (_source146.is_Nullable) {
+              DAST._IType _3240___mcc_h962 = _source146.dtor_Nullable_a0;
+              {
+                RAST._IExpr _out1047;
+                DCOMP._IOwnership _out1048;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1049;
+                (this).GenExprConvertToNullable(e, selfIdent, @params, expectedOwnership, out _out1047, out _out1048, out _out1049);
+                r = _out1047;
+                resultingOwnership = _out1048;
+                readIdents = _out1049;
+              }
+            } else if (_source146.is_Tuple) {
+              Dafny.ISequence<DAST._IType> _3241___mcc_h964 = _source146.dtor_Tuple_a0;
+              {
+                RAST._IExpr _out1050;
+                DCOMP._IOwnership _out1051;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1052;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1050, out _out1051, out _out1052);
+                r = _out1050;
+                resultingOwnership = _out1051;
+                readIdents = _out1052;
+              }
+            } else if (_source146.is_Array) {
+              DAST._IType _3242___mcc_h966 = _source146.dtor_element;
+              BigInteger _3243___mcc_h967 = _source146.dtor_dims;
+              {
+                RAST._IExpr _out1053;
+                DCOMP._IOwnership _out1054;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1055;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1053, out _out1054, out _out1055);
+                r = _out1053;
+                resultingOwnership = _out1054;
+                readIdents = _out1055;
+              }
+            } else if (_source146.is_Seq) {
+              DAST._IType _3244___mcc_h970 = _source146.dtor_element;
+              {
+                RAST._IExpr _out1056;
+                DCOMP._IOwnership _out1057;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1058;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1056, out _out1057, out _out1058);
+                r = _out1056;
+                resultingOwnership = _out1057;
+                readIdents = _out1058;
+              }
+            } else if (_source146.is_Set) {
+              DAST._IType _3245___mcc_h972 = _source146.dtor_element;
+              {
+                RAST._IExpr _out1059;
+                DCOMP._IOwnership _out1060;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1061;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1059, out _out1060, out _out1061);
+                r = _out1059;
+                resultingOwnership = _out1060;
+                readIdents = _out1061;
+              }
+            } else if (_source146.is_Multiset) {
+              DAST._IType _3246___mcc_h974 = _source146.dtor_element;
+              {
+                RAST._IExpr _out1062;
+                DCOMP._IOwnership _out1063;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1064;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1062, out _out1063, out _out1064);
+                r = _out1062;
+                resultingOwnership = _out1063;
+                readIdents = _out1064;
+              }
+            } else if (_source146.is_Map) {
+              DAST._IType _3247___mcc_h976 = _source146.dtor_key;
+              DAST._IType _3248___mcc_h977 = _source146.dtor_value;
+              {
+                RAST._IExpr _out1065;
+                DCOMP._IOwnership _out1066;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1067;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1065, out _out1066, out _out1067);
+                r = _out1065;
+                resultingOwnership = _out1066;
+                readIdents = _out1067;
+              }
+            } else if (_source146.is_SetBuilder) {
+              DAST._IType _3249___mcc_h980 = _source146.dtor_element;
+              {
+                RAST._IExpr _out1068;
+                DCOMP._IOwnership _out1069;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1070;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1068, out _out1069, out _out1070);
+                r = _out1068;
+                resultingOwnership = _out1069;
+                readIdents = _out1070;
+              }
+            } else if (_source146.is_MapBuilder) {
+              DAST._IType _3250___mcc_h982 = _source146.dtor_key;
+              DAST._IType _3251___mcc_h983 = _source146.dtor_value;
+              {
+                RAST._IExpr _out1071;
+                DCOMP._IOwnership _out1072;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1073;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1071, out _out1072, out _out1073);
+                r = _out1071;
+                resultingOwnership = _out1072;
+                readIdents = _out1073;
+              }
+            } else if (_source146.is_Arrow) {
+              Dafny.ISequence<DAST._IType> _3252___mcc_h986 = _source146.dtor_args;
+              DAST._IType _3253___mcc_h987 = _source146.dtor_result;
+              {
+                RAST._IExpr _out1074;
+                DCOMP._IOwnership _out1075;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1076;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1074, out _out1075, out _out1076);
+                r = _out1074;
+                resultingOwnership = _out1075;
+                readIdents = _out1076;
+              }
+            } else if (_source146.is_Primitive) {
+              DAST._IPrimitive _3254___mcc_h990 = _source146.dtor_Primitive_a0;
+              {
+                RAST._IExpr _out1077;
+                DCOMP._IOwnership _out1078;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1079;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1077, out _out1078, out _out1079);
+                r = _out1077;
+                resultingOwnership = _out1078;
+                readIdents = _out1079;
+              }
+            } else if (_source146.is_Passthrough) {
+              Dafny.ISequence<Dafny.Rune> _3255___mcc_h992 = _source146.dtor_Passthrough_a0;
+              {
+                RAST._IExpr _out1080;
+                DCOMP._IOwnership _out1081;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1082;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1080, out _out1081, out _out1082);
+                r = _out1080;
+                resultingOwnership = _out1081;
+                readIdents = _out1082;
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3256___mcc_h994 = _source146.dtor_TypeArg_a0;
+              {
+                RAST._IExpr _out1083;
+                DCOMP._IOwnership _out1084;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1085;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1083, out _out1084, out _out1085);
+                r = _out1083;
+                resultingOwnership = _out1084;
+                readIdents = _out1085;
+              }
+            }
+          } else {
+            DAST._IType _source148 = _2704___mcc_h1;
+            if (_source148.is_Path) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3257___mcc_h996 = _source148.dtor_Path_a0;
+              Dafny.ISequence<DAST._IType> _3258___mcc_h997 = _source148.dtor_typeArgs;
+              DAST._IResolvedType _3259___mcc_h998 = _source148.dtor_resolved;
+              DAST._IResolvedType _source149 = _3259___mcc_h998;
+              if (_source149.is_Datatype) {
+                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3260___mcc_h1002 = _source149.dtor_path;
+                {
+                  RAST._IExpr _out1086;
+                  DCOMP._IOwnership _out1087;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1088;
+                  (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1086, out _out1087, out _out1088);
+                  r = _out1086;
+                  resultingOwnership = _out1087;
+                  readIdents = _out1088;
+                }
+              } else if (_source149.is_Trait) {
+                Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3261___mcc_h1004 = _source149.dtor_path;
+                {
+                  RAST._IExpr _out1089;
+                  DCOMP._IOwnership _out1090;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1091;
+                  (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1089, out _out1090, out _out1091);
+                  r = _out1089;
+                  resultingOwnership = _out1090;
+                  readIdents = _out1091;
+                }
+              } else {
+                DAST._IType _3262___mcc_h1006 = _source149.dtor_baseType;
+                DAST._INewtypeRange _3263___mcc_h1007 = _source149.dtor_range;
+                bool _3264___mcc_h1008 = _source149.dtor_erase;
+                bool _3265_erase = _3264___mcc_h1008;
+                DAST._INewtypeRange _3266_range = _3263___mcc_h1007;
+                DAST._IType _3267_b = _3262___mcc_h1006;
+                {
+                  RAST._IExpr _out1092;
+                  DCOMP._IOwnership _out1093;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1094;
+                  (this).GenExprConvertToNewtype(e, selfIdent, @params, expectedOwnership, out _out1092, out _out1093, out _out1094);
+                  r = _out1092;
+                  resultingOwnership = _out1093;
+                  readIdents = _out1094;
+                }
+              }
+            } else if (_source148.is_Nullable) {
+              DAST._IType _3268___mcc_h1012 = _source148.dtor_Nullable_a0;
+              {
+                RAST._IExpr _out1095;
+                DCOMP._IOwnership _out1096;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1097;
+                (this).GenExprConvertToNullable(e, selfIdent, @params, expectedOwnership, out _out1095, out _out1096, out _out1097);
+                r = _out1095;
+                resultingOwnership = _out1096;
+                readIdents = _out1097;
+              }
+            } else if (_source148.is_Tuple) {
+              Dafny.ISequence<DAST._IType> _3269___mcc_h1014 = _source148.dtor_Tuple_a0;
+              {
+                RAST._IExpr _out1098;
+                DCOMP._IOwnership _out1099;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1100;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1098, out _out1099, out _out1100);
+                r = _out1098;
+                resultingOwnership = _out1099;
+                readIdents = _out1100;
+              }
+            } else if (_source148.is_Array) {
+              DAST._IType _3270___mcc_h1016 = _source148.dtor_element;
+              BigInteger _3271___mcc_h1017 = _source148.dtor_dims;
+              {
+                RAST._IExpr _out1101;
+                DCOMP._IOwnership _out1102;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1103;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1101, out _out1102, out _out1103);
+                r = _out1101;
+                resultingOwnership = _out1102;
+                readIdents = _out1103;
+              }
+            } else if (_source148.is_Seq) {
+              DAST._IType _3272___mcc_h1020 = _source148.dtor_element;
+              {
+                RAST._IExpr _out1104;
+                DCOMP._IOwnership _out1105;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1106;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1104, out _out1105, out _out1106);
+                r = _out1104;
+                resultingOwnership = _out1105;
+                readIdents = _out1106;
+              }
+            } else if (_source148.is_Set) {
+              DAST._IType _3273___mcc_h1022 = _source148.dtor_element;
+              {
+                RAST._IExpr _out1107;
+                DCOMP._IOwnership _out1108;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1109;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1107, out _out1108, out _out1109);
+                r = _out1107;
+                resultingOwnership = _out1108;
+                readIdents = _out1109;
+              }
+            } else if (_source148.is_Multiset) {
+              DAST._IType _3274___mcc_h1024 = _source148.dtor_element;
+              {
+                RAST._IExpr _out1110;
+                DCOMP._IOwnership _out1111;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1112;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1110, out _out1111, out _out1112);
+                r = _out1110;
+                resultingOwnership = _out1111;
+                readIdents = _out1112;
+              }
+            } else if (_source148.is_Map) {
+              DAST._IType _3275___mcc_h1026 = _source148.dtor_key;
+              DAST._IType _3276___mcc_h1027 = _source148.dtor_value;
+              {
+                RAST._IExpr _out1113;
+                DCOMP._IOwnership _out1114;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1115;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1113, out _out1114, out _out1115);
+                r = _out1113;
+                resultingOwnership = _out1114;
+                readIdents = _out1115;
+              }
+            } else if (_source148.is_SetBuilder) {
+              DAST._IType _3277___mcc_h1030 = _source148.dtor_element;
+              {
+                RAST._IExpr _out1116;
+                DCOMP._IOwnership _out1117;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1118;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1116, out _out1117, out _out1118);
+                r = _out1116;
+                resultingOwnership = _out1117;
+                readIdents = _out1118;
+              }
+            } else if (_source148.is_MapBuilder) {
+              DAST._IType _3278___mcc_h1032 = _source148.dtor_key;
+              DAST._IType _3279___mcc_h1033 = _source148.dtor_value;
+              {
+                RAST._IExpr _out1119;
+                DCOMP._IOwnership _out1120;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1121;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1119, out _out1120, out _out1121);
+                r = _out1119;
+                resultingOwnership = _out1120;
+                readIdents = _out1121;
+              }
+            } else if (_source148.is_Arrow) {
+              Dafny.ISequence<DAST._IType> _3280___mcc_h1036 = _source148.dtor_args;
+              DAST._IType _3281___mcc_h1037 = _source148.dtor_result;
+              {
+                RAST._IExpr _out1122;
+                DCOMP._IOwnership _out1123;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1124;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1122, out _out1123, out _out1124);
+                r = _out1122;
+                resultingOwnership = _out1123;
+                readIdents = _out1124;
+              }
+            } else if (_source148.is_Primitive) {
+              DAST._IPrimitive _3282___mcc_h1040 = _source148.dtor_Primitive_a0;
+              DAST._IPrimitive _source150 = _3282___mcc_h1040;
+              if (_source150.is_Int) {
+                {
+                  RAST._IType _3283_rhsType;
+                  RAST._IType _out1125;
+                  _out1125 = (this).GenType(_2698_fromTpe, true, false);
+                  _3283_rhsType = _out1125;
+                  RAST._IExpr _3284_recursiveGen;
+                  DCOMP._IOwnership _3285___v81;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3286_recIdents;
+                  RAST._IExpr _out1126;
+                  DCOMP._IOwnership _out1127;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1128;
+                  (this).GenExpr(_2697_expr, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out1126, out _out1127, out _out1128);
+                  _3284_recursiveGen = _out1126;
+                  _3285___v81 = _out1127;
+                  _3286_recIdents = _out1128;
+                  r = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyInt{data: ::BigInt::from("), (_3284_recursiveGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as u32)}")));
+                  RAST._IExpr _out1129;
+                  DCOMP._IOwnership _out1130;
+                  DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1129, out _out1130);
+                  r = _out1129;
+                  resultingOwnership = _out1130;
+                  readIdents = _3286_recIdents;
+                }
+              } else if (_source150.is_Real) {
+                {
+                  RAST._IExpr _out1131;
+                  DCOMP._IOwnership _out1132;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1133;
+                  (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1131, out _out1132, out _out1133);
+                  r = _out1131;
+                  resultingOwnership = _out1132;
+                  readIdents = _out1133;
+                }
+              } else if (_source150.is_String) {
+                {
+                  RAST._IExpr _out1134;
+                  DCOMP._IOwnership _out1135;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1136;
+                  (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1134, out _out1135, out _out1136);
+                  r = _out1134;
+                  resultingOwnership = _out1135;
+                  readIdents = _out1136;
+                }
+              } else if (_source150.is_Bool) {
+                {
+                  RAST._IExpr _out1137;
+                  DCOMP._IOwnership _out1138;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1139;
+                  (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1137, out _out1138, out _out1139);
+                  r = _out1137;
+                  resultingOwnership = _out1138;
+                  readIdents = _out1139;
+                }
+              } else {
+                {
+                  RAST._IExpr _out1140;
+                  DCOMP._IOwnership _out1141;
+                  Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1142;
+                  (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1140, out _out1141, out _out1142);
+                  r = _out1140;
+                  resultingOwnership = _out1141;
+                  readIdents = _out1142;
+                }
+              }
+            } else if (_source148.is_Passthrough) {
+              Dafny.ISequence<Dafny.Rune> _3287___mcc_h1042 = _source148.dtor_Passthrough_a0;
+              {
+                RAST._IExpr _out1143;
+                DCOMP._IOwnership _out1144;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1145;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1143, out _out1144, out _out1145);
+                r = _out1143;
+                resultingOwnership = _out1144;
+                readIdents = _out1145;
+              }
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3288___mcc_h1044 = _source148.dtor_TypeArg_a0;
+              {
+                RAST._IExpr _out1146;
+                DCOMP._IOwnership _out1147;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1148;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1146, out _out1147, out _out1148);
+                r = _out1146;
+                resultingOwnership = _out1147;
+                readIdents = _out1148;
+              }
+            }
+          }
+        } else if (_source109.is_Passthrough) {
+          Dafny.ISequence<Dafny.Rune> _3289___mcc_h1046 = _source109.dtor_Passthrough_a0;
+          DAST._IType _source151 = _2704___mcc_h1;
+          if (_source151.is_Path) {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3290___mcc_h1050 = _source151.dtor_Path_a0;
+            Dafny.ISequence<DAST._IType> _3291___mcc_h1051 = _source151.dtor_typeArgs;
+            DAST._IResolvedType _3292___mcc_h1052 = _source151.dtor_resolved;
+            DAST._IResolvedType _source152 = _3292___mcc_h1052;
+            if (_source152.is_Datatype) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3293___mcc_h1056 = _source152.dtor_path;
+              {
+                RAST._IExpr _out1149;
+                DCOMP._IOwnership _out1150;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1151;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1149, out _out1150, out _out1151);
+                r = _out1149;
+                resultingOwnership = _out1150;
+                readIdents = _out1151;
+              }
+            } else if (_source152.is_Trait) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3294___mcc_h1058 = _source152.dtor_path;
+              {
+                RAST._IExpr _out1152;
+                DCOMP._IOwnership _out1153;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1154;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1152, out _out1153, out _out1154);
+                r = _out1152;
+                resultingOwnership = _out1153;
+                readIdents = _out1154;
+              }
+            } else {
+              DAST._IType _3295___mcc_h1060 = _source152.dtor_baseType;
+              DAST._INewtypeRange _3296___mcc_h1061 = _source152.dtor_range;
+              bool _3297___mcc_h1062 = _source152.dtor_erase;
+              bool _3298_erase = _3297___mcc_h1062;
+              DAST._INewtypeRange _3299_range = _3296___mcc_h1061;
+              DAST._IType _3300_b = _3295___mcc_h1060;
+              {
+                RAST._IExpr _out1155;
+                DCOMP._IOwnership _out1156;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1157;
+                (this).GenExprConvertToNewtype(e, selfIdent, @params, expectedOwnership, out _out1155, out _out1156, out _out1157);
+                r = _out1155;
+                resultingOwnership = _out1156;
+                readIdents = _out1157;
+              }
+            }
+          } else if (_source151.is_Nullable) {
+            DAST._IType _3301___mcc_h1066 = _source151.dtor_Nullable_a0;
+            {
+              RAST._IExpr _out1158;
+              DCOMP._IOwnership _out1159;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1160;
+              (this).GenExprConvertToNullable(e, selfIdent, @params, expectedOwnership, out _out1158, out _out1159, out _out1160);
+              r = _out1158;
+              resultingOwnership = _out1159;
+              readIdents = _out1160;
+            }
+          } else if (_source151.is_Tuple) {
+            Dafny.ISequence<DAST._IType> _3302___mcc_h1068 = _source151.dtor_Tuple_a0;
+            {
+              RAST._IExpr _out1161;
+              DCOMP._IOwnership _out1162;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1163;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1161, out _out1162, out _out1163);
+              r = _out1161;
+              resultingOwnership = _out1162;
+              readIdents = _out1163;
+            }
+          } else if (_source151.is_Array) {
+            DAST._IType _3303___mcc_h1070 = _source151.dtor_element;
+            BigInteger _3304___mcc_h1071 = _source151.dtor_dims;
+            {
+              RAST._IExpr _out1164;
+              DCOMP._IOwnership _out1165;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1166;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1164, out _out1165, out _out1166);
+              r = _out1164;
+              resultingOwnership = _out1165;
+              readIdents = _out1166;
+            }
+          } else if (_source151.is_Seq) {
+            DAST._IType _3305___mcc_h1074 = _source151.dtor_element;
+            {
+              RAST._IExpr _out1167;
+              DCOMP._IOwnership _out1168;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1169;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1167, out _out1168, out _out1169);
+              r = _out1167;
+              resultingOwnership = _out1168;
+              readIdents = _out1169;
+            }
+          } else if (_source151.is_Set) {
+            DAST._IType _3306___mcc_h1076 = _source151.dtor_element;
+            {
+              RAST._IExpr _out1170;
+              DCOMP._IOwnership _out1171;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1172;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1170, out _out1171, out _out1172);
+              r = _out1170;
+              resultingOwnership = _out1171;
+              readIdents = _out1172;
+            }
+          } else if (_source151.is_Multiset) {
+            DAST._IType _3307___mcc_h1078 = _source151.dtor_element;
+            {
+              RAST._IExpr _out1173;
+              DCOMP._IOwnership _out1174;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1175;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1173, out _out1174, out _out1175);
+              r = _out1173;
+              resultingOwnership = _out1174;
+              readIdents = _out1175;
+            }
+          } else if (_source151.is_Map) {
+            DAST._IType _3308___mcc_h1080 = _source151.dtor_key;
+            DAST._IType _3309___mcc_h1081 = _source151.dtor_value;
+            {
+              RAST._IExpr _out1176;
+              DCOMP._IOwnership _out1177;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1178;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1176, out _out1177, out _out1178);
+              r = _out1176;
+              resultingOwnership = _out1177;
+              readIdents = _out1178;
+            }
+          } else if (_source151.is_SetBuilder) {
+            DAST._IType _3310___mcc_h1084 = _source151.dtor_element;
+            {
+              RAST._IExpr _out1179;
+              DCOMP._IOwnership _out1180;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1181;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1179, out _out1180, out _out1181);
+              r = _out1179;
+              resultingOwnership = _out1180;
+              readIdents = _out1181;
+            }
+          } else if (_source151.is_MapBuilder) {
+            DAST._IType _3311___mcc_h1086 = _source151.dtor_key;
+            DAST._IType _3312___mcc_h1087 = _source151.dtor_value;
+            {
+              RAST._IExpr _out1182;
+              DCOMP._IOwnership _out1183;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1184;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1182, out _out1183, out _out1184);
+              r = _out1182;
+              resultingOwnership = _out1183;
+              readIdents = _out1184;
+            }
+          } else if (_source151.is_Arrow) {
+            Dafny.ISequence<DAST._IType> _3313___mcc_h1090 = _source151.dtor_args;
+            DAST._IType _3314___mcc_h1091 = _source151.dtor_result;
+            {
+              RAST._IExpr _out1185;
+              DCOMP._IOwnership _out1186;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1187;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1185, out _out1186, out _out1187);
+              r = _out1185;
+              resultingOwnership = _out1186;
+              readIdents = _out1187;
+            }
+          } else if (_source151.is_Primitive) {
+            DAST._IPrimitive _3315___mcc_h1094 = _source151.dtor_Primitive_a0;
+            DAST._IPrimitive _source153 = _3315___mcc_h1094;
+            if (_source153.is_Int) {
+              {
+                RAST._IType _3316_rhsType;
+                RAST._IType _out1188;
+                _out1188 = (this).GenType(_2698_fromTpe, true, false);
+                _3316_rhsType = _out1188;
+                RAST._IExpr _3317_recursiveGen;
+                DCOMP._IOwnership _3318___v79;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3319_recIdents;
+                RAST._IExpr _out1189;
+                DCOMP._IOwnership _out1190;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1191;
+                (this).GenExpr(_2697_expr, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out1189, out _out1190, out _out1191);
+                _3317_recursiveGen = _out1189;
+                _3318___v79 = _out1190;
+                _3319_recIdents = _out1191;
+                r = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyInt{data: ::dafny_runtime::BigInt::from("), (_3317_recursiveGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")}")));
+                RAST._IExpr _out1192;
+                DCOMP._IOwnership _out1193;
+                DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1192, out _out1193);
+                r = _out1192;
+                resultingOwnership = _out1193;
+                readIdents = _3319_recIdents;
+              }
+            } else if (_source153.is_Real) {
+              {
+                RAST._IExpr _out1194;
+                DCOMP._IOwnership _out1195;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1196;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1194, out _out1195, out _out1196);
+                r = _out1194;
+                resultingOwnership = _out1195;
+                readIdents = _out1196;
+              }
+            } else if (_source153.is_String) {
+              {
+                RAST._IExpr _out1197;
+                DCOMP._IOwnership _out1198;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1199;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1197, out _out1198, out _out1199);
+                r = _out1197;
+                resultingOwnership = _out1198;
+                readIdents = _out1199;
+              }
+            } else if (_source153.is_Bool) {
+              {
+                RAST._IExpr _out1200;
+                DCOMP._IOwnership _out1201;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1202;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1200, out _out1201, out _out1202);
+                r = _out1200;
+                resultingOwnership = _out1201;
+                readIdents = _out1202;
+              }
+            } else {
+              {
+                RAST._IExpr _out1203;
+                DCOMP._IOwnership _out1204;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1205;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1203, out _out1204, out _out1205);
+                r = _out1203;
+                resultingOwnership = _out1204;
+                readIdents = _out1205;
+              }
+            }
+          } else if (_source151.is_Passthrough) {
+            Dafny.ISequence<Dafny.Rune> _3320___mcc_h1096 = _source151.dtor_Passthrough_a0;
+            {
+              RAST._IExpr _3321_recursiveGen;
+              DCOMP._IOwnership _3322___v84;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3323_recIdents;
+              RAST._IExpr _out1206;
+              DCOMP._IOwnership _out1207;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1208;
+              (this).GenExpr(_2697_expr, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out1206, out _out1207, out _out1208);
+              _3321_recursiveGen = _out1206;
+              _3322___v84 = _out1207;
+              _3323_recIdents = _out1208;
+              RAST._IType _3324_toTpeGen;
+              RAST._IType _out1209;
+              _out1209 = (this).GenType(_2699_toTpe, true, false);
+              _3324_toTpeGen = _out1209;
+              r = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(("), (_3321_recursiveGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") as ")), (_3324_toTpeGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")));
+              RAST._IExpr _out1210;
+              DCOMP._IOwnership _out1211;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1210, out _out1211);
+              r = _out1210;
+              resultingOwnership = _out1211;
+              readIdents = _3323_recIdents;
+            }
+          } else {
+            Dafny.ISequence<Dafny.Rune> _3325___mcc_h1098 = _source151.dtor_TypeArg_a0;
+            {
+              RAST._IExpr _out1212;
+              DCOMP._IOwnership _out1213;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1214;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1212, out _out1213, out _out1214);
+              r = _out1212;
+              resultingOwnership = _out1213;
+              readIdents = _out1214;
+            }
+          }
+        } else {
+          Dafny.ISequence<Dafny.Rune> _3326___mcc_h1100 = _source109.dtor_TypeArg_a0;
+          DAST._IType _source154 = _2704___mcc_h1;
+          if (_source154.is_Path) {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3327___mcc_h1104 = _source154.dtor_Path_a0;
+            Dafny.ISequence<DAST._IType> _3328___mcc_h1105 = _source154.dtor_typeArgs;
+            DAST._IResolvedType _3329___mcc_h1106 = _source154.dtor_resolved;
+            DAST._IResolvedType _source155 = _3329___mcc_h1106;
+            if (_source155.is_Datatype) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3330___mcc_h1110 = _source155.dtor_path;
+              {
+                RAST._IExpr _out1215;
+                DCOMP._IOwnership _out1216;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1217;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1215, out _out1216, out _out1217);
+                r = _out1215;
+                resultingOwnership = _out1216;
+                readIdents = _out1217;
+              }
+            } else if (_source155.is_Trait) {
+              Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3331___mcc_h1112 = _source155.dtor_path;
+              {
+                RAST._IExpr _out1218;
+                DCOMP._IOwnership _out1219;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1220;
+                (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1218, out _out1219, out _out1220);
+                r = _out1218;
+                resultingOwnership = _out1219;
+                readIdents = _out1220;
+              }
+            } else {
+              DAST._IType _3332___mcc_h1114 = _source155.dtor_baseType;
+              DAST._INewtypeRange _3333___mcc_h1115 = _source155.dtor_range;
+              bool _3334___mcc_h1116 = _source155.dtor_erase;
+              bool _3335_erase = _3334___mcc_h1116;
+              DAST._INewtypeRange _3336_range = _3333___mcc_h1115;
+              DAST._IType _3337_b = _3332___mcc_h1114;
+              {
+                RAST._IExpr _out1221;
+                DCOMP._IOwnership _out1222;
+                Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1223;
+                (this).GenExprConvertToNewtype(e, selfIdent, @params, expectedOwnership, out _out1221, out _out1222, out _out1223);
+                r = _out1221;
+                resultingOwnership = _out1222;
+                readIdents = _out1223;
+              }
+            }
+          } else if (_source154.is_Nullable) {
+            DAST._IType _3338___mcc_h1120 = _source154.dtor_Nullable_a0;
+            {
+              RAST._IExpr _out1224;
+              DCOMP._IOwnership _out1225;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1226;
+              (this).GenExprConvertToNullable(e, selfIdent, @params, expectedOwnership, out _out1224, out _out1225, out _out1226);
+              r = _out1224;
+              resultingOwnership = _out1225;
+              readIdents = _out1226;
+            }
+          } else if (_source154.is_Tuple) {
+            Dafny.ISequence<DAST._IType> _3339___mcc_h1122 = _source154.dtor_Tuple_a0;
+            {
+              RAST._IExpr _out1227;
+              DCOMP._IOwnership _out1228;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1229;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1227, out _out1228, out _out1229);
+              r = _out1227;
+              resultingOwnership = _out1228;
+              readIdents = _out1229;
+            }
+          } else if (_source154.is_Array) {
+            DAST._IType _3340___mcc_h1124 = _source154.dtor_element;
+            BigInteger _3341___mcc_h1125 = _source154.dtor_dims;
+            {
+              RAST._IExpr _out1230;
+              DCOMP._IOwnership _out1231;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1232;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1230, out _out1231, out _out1232);
+              r = _out1230;
+              resultingOwnership = _out1231;
+              readIdents = _out1232;
+            }
+          } else if (_source154.is_Seq) {
+            DAST._IType _3342___mcc_h1128 = _source154.dtor_element;
+            {
+              RAST._IExpr _out1233;
+              DCOMP._IOwnership _out1234;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1235;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1233, out _out1234, out _out1235);
+              r = _out1233;
+              resultingOwnership = _out1234;
+              readIdents = _out1235;
+            }
+          } else if (_source154.is_Set) {
+            DAST._IType _3343___mcc_h1130 = _source154.dtor_element;
+            {
+              RAST._IExpr _out1236;
+              DCOMP._IOwnership _out1237;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1238;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1236, out _out1237, out _out1238);
+              r = _out1236;
+              resultingOwnership = _out1237;
+              readIdents = _out1238;
+            }
+          } else if (_source154.is_Multiset) {
+            DAST._IType _3344___mcc_h1132 = _source154.dtor_element;
+            {
+              RAST._IExpr _out1239;
+              DCOMP._IOwnership _out1240;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1241;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1239, out _out1240, out _out1241);
+              r = _out1239;
+              resultingOwnership = _out1240;
+              readIdents = _out1241;
+            }
+          } else if (_source154.is_Map) {
+            DAST._IType _3345___mcc_h1134 = _source154.dtor_key;
+            DAST._IType _3346___mcc_h1135 = _source154.dtor_value;
+            {
+              RAST._IExpr _out1242;
+              DCOMP._IOwnership _out1243;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1244;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1242, out _out1243, out _out1244);
+              r = _out1242;
+              resultingOwnership = _out1243;
+              readIdents = _out1244;
+            }
+          } else if (_source154.is_SetBuilder) {
+            DAST._IType _3347___mcc_h1138 = _source154.dtor_element;
+            {
+              RAST._IExpr _out1245;
+              DCOMP._IOwnership _out1246;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1247;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1245, out _out1246, out _out1247);
+              r = _out1245;
+              resultingOwnership = _out1246;
+              readIdents = _out1247;
+            }
+          } else if (_source154.is_MapBuilder) {
+            DAST._IType _3348___mcc_h1140 = _source154.dtor_key;
+            DAST._IType _3349___mcc_h1141 = _source154.dtor_value;
+            {
+              RAST._IExpr _out1248;
+              DCOMP._IOwnership _out1249;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1250;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1248, out _out1249, out _out1250);
+              r = _out1248;
+              resultingOwnership = _out1249;
+              readIdents = _out1250;
+            }
+          } else if (_source154.is_Arrow) {
+            Dafny.ISequence<DAST._IType> _3350___mcc_h1144 = _source154.dtor_args;
+            DAST._IType _3351___mcc_h1145 = _source154.dtor_result;
+            {
+              RAST._IExpr _out1251;
+              DCOMP._IOwnership _out1252;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1253;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1251, out _out1252, out _out1253);
+              r = _out1251;
+              resultingOwnership = _out1252;
+              readIdents = _out1253;
+            }
+          } else if (_source154.is_Primitive) {
+            DAST._IPrimitive _3352___mcc_h1148 = _source154.dtor_Primitive_a0;
+            {
+              RAST._IExpr _out1254;
+              DCOMP._IOwnership _out1255;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1256;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1254, out _out1255, out _out1256);
+              r = _out1254;
+              resultingOwnership = _out1255;
+              readIdents = _out1256;
+            }
+          } else if (_source154.is_Passthrough) {
+            Dafny.ISequence<Dafny.Rune> _3353___mcc_h1150 = _source154.dtor_Passthrough_a0;
+            {
+              RAST._IExpr _out1257;
+              DCOMP._IOwnership _out1258;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1259;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1257, out _out1258, out _out1259);
+              r = _out1257;
+              resultingOwnership = _out1258;
+              readIdents = _out1259;
+            }
+          } else {
+            Dafny.ISequence<Dafny.Rune> _3354___mcc_h1152 = _source154.dtor_TypeArg_a0;
+            {
+              RAST._IExpr _out1260;
+              DCOMP._IOwnership _out1261;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1262;
+              (this).GenExprConvertNotImplemented(e, selfIdent, @params, expectedOwnership, out _out1260, out _out1261, out _out1262);
+              r = _out1260;
+              resultingOwnership = _out1261;
+              readIdents = _out1262;
+            }
+          }
+        }
+      }
+      return ;
+    }
+    public void GenExpr(DAST._IExpression e, Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> selfIdent, Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> @params, DCOMP._IOwnership expectedOwnership, out RAST._IExpr r, out DCOMP._IOwnership resultingOwnership, out Dafny.ISet<Dafny.ISequence<Dafny.Rune>> readIdents)
+    {
+      r = RAST.Expr.Default();
+      resultingOwnership = DCOMP.Ownership.Default();
+      readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Empty;
+      DAST._IExpression _source156 = e;
+      if (_source156.is_Literal) {
+        DAST._ILiteral _3355___mcc_h0 = _source156.dtor_Literal_a0;
+        RAST._IExpr _out1263;
+        DCOMP._IOwnership _out1264;
+        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1265;
+        (this).GenExprLiteral(e, selfIdent, @params, expectedOwnership, out _out1263, out _out1264, out _out1265);
+        r = _out1263;
+        resultingOwnership = _out1264;
+        readIdents = _out1265;
+      } else if (_source156.is_Ident) {
+        Dafny.ISequence<Dafny.Rune> _3356___mcc_h1 = _source156.dtor_Ident_a0;
+        Dafny.ISequence<Dafny.Rune> _3357_name = _3356___mcc_h1;
+        {
+          r = RAST.Expr.create_Identifier(DCOMP.__default.escapeIdent(_3357_name));
+          bool _3358_currentlyBorrowed;
+          _3358_currentlyBorrowed = (@params).Contains(_3357_name);
+          if (object.Equals(expectedOwnership, DCOMP.Ownership.create_OwnershipAutoBorrowed())) {
+            resultingOwnership = DCOMP.Ownership.create_OwnershipOwned();
+          } else if (object.Equals(expectedOwnership, DCOMP.Ownership.create_OwnershipBorrowedMut())) {
+            r = RAST.__default.BorrowMut(r);
+            resultingOwnership = DCOMP.Ownership.create_OwnershipBorrowedMut();
+          } else if (object.Equals(expectedOwnership, DCOMP.Ownership.create_OwnershipOwned())) {
+            r = RAST.__default.Clone(r);
+            resultingOwnership = DCOMP.Ownership.create_OwnershipOwned();
+          } else if (_3358_currentlyBorrowed) {
+            resultingOwnership = DCOMP.Ownership.create_OwnershipBorrowed();
+          } else {
+            r = RAST.__default.Borrow(r);
+            resultingOwnership = DCOMP.Ownership.create_OwnershipBorrowed();
+          }
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements(_3357_name);
+          return ;
+        }
+      } else if (_source156.is_Companion) {
+        Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3359___mcc_h2 = _source156.dtor_Companion_a0;
+        Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3360_path = _3359___mcc_h2;
+        {
+          Dafny.ISequence<Dafny.Rune> _3361_p;
+          Dafny.ISequence<Dafny.Rune> _out1266;
+          _out1266 = DCOMP.COMP.GenPath(_3360_path);
+          _3361_p = _out1266;
+          r = RAST.Expr.create_RawExpr(_3361_p);
+          RAST._IExpr _out1267;
+          DCOMP._IOwnership _out1268;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1267, out _out1268);
+          r = _out1267;
+          resultingOwnership = _out1268;
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          return ;
+        }
+      } else if (_source156.is_Tuple) {
+        Dafny.ISequence<DAST._IExpression> _3362___mcc_h3 = _source156.dtor_Tuple_a0;
+        Dafny.ISequence<DAST._IExpression> _3363_values = _3362___mcc_h3;
+        {
+          Dafny.ISequence<Dafny.Rune> _3364_s;
+          _3364_s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(");
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          BigInteger _3365_i;
+          _3365_i = BigInteger.Zero;
+          while ((_3365_i) < (new BigInteger((_3363_values).Count))) {
+            if ((_3365_i).Sign == 1) {
+              _3364_s = Dafny.Sequence<Dafny.Rune>.Concat(_3364_s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" "));
+            }
+            RAST._IExpr _3366_recursiveGen;
+            DCOMP._IOwnership _3367___v87;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3368_recIdents;
+            RAST._IExpr _out1269;
+            DCOMP._IOwnership _out1270;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1271;
+            (this).GenExpr((_3363_values).Select(_3365_i), selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out1269, out _out1270, out _out1271);
+            _3366_recursiveGen = _out1269;
+            _3367___v87 = _out1270;
+            _3368_recIdents = _out1271;
+            _3364_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3364_s, (_3366_recursiveGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(","));
+            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _3368_recIdents);
+            _3365_i = (_3365_i) + (BigInteger.One);
+          }
+          _3364_s = Dafny.Sequence<Dafny.Rune>.Concat(_3364_s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
+          r = RAST.Expr.create_RawExpr(_3364_s);
+          RAST._IExpr _out1272;
+          DCOMP._IOwnership _out1273;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1272, out _out1273);
+          r = _out1272;
+          resultingOwnership = _out1273;
+          return ;
+        }
+      } else if (_source156.is_New) {
+        Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3369___mcc_h4 = _source156.dtor_path;
+        Dafny.ISequence<DAST._IType> _3370___mcc_h5 = _source156.dtor_typeArgs;
+        Dafny.ISequence<DAST._IExpression> _3371___mcc_h6 = _source156.dtor_args;
+        Dafny.ISequence<DAST._IExpression> _3372_args = _3371___mcc_h6;
+        Dafny.ISequence<DAST._IType> _3373_typeArgs = _3370___mcc_h5;
+        Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3374_path = _3369___mcc_h4;
+        {
+          Dafny.ISequence<Dafny.Rune> _3375_path;
+          Dafny.ISequence<Dafny.Rune> _out1274;
+          _out1274 = DCOMP.COMP.GenPath(_3374_path);
+          _3375_path = _out1274;
+          Dafny.ISequence<Dafny.Rune> _3376_s;
+          _3376_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::new("), _3375_path);
+          if ((new BigInteger((_3373_typeArgs).Count)).Sign == 1) {
+            BigInteger _3377_i;
+            _3377_i = BigInteger.Zero;
+            Dafny.ISequence<RAST._IType> _3378_typeExprs;
+            _3378_typeExprs = Dafny.Sequence<RAST._IType>.FromElements();
+            while ((_3377_i) < (new BigInteger((_3373_typeArgs).Count))) {
+              RAST._IType _3379_typeExpr;
+              RAST._IType _out1275;
+              _out1275 = (this).GenType((_3373_typeArgs).Select(_3377_i), false, false);
+              _3379_typeExpr = _out1275;
+              _3378_typeExprs = Dafny.Sequence<RAST._IType>.Concat(_3378_typeExprs, Dafny.Sequence<RAST._IType>.FromElements(_3379_typeExpr));
+              _3377_i = (_3377_i) + (BigInteger.One);
+            }
+            _3376_s = Dafny.Sequence<Dafny.Rune>.Concat(_3376_s, (RAST.Type.create_TypeApp(RAST.Type.create_TIdentifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::")), _3378_typeExprs))._ToString(DCOMP.__default.IND));
+          }
+          _3376_s = Dafny.Sequence<Dafny.Rune>.Concat(_3376_s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::new("));
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          BigInteger _3380_i;
+          _3380_i = BigInteger.Zero;
+          while ((_3380_i) < (new BigInteger((_3372_args).Count))) {
+            if ((_3380_i).Sign == 1) {
+              _3376_s = Dafny.Sequence<Dafny.Rune>.Concat(_3376_s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
+            }
+            RAST._IExpr _3381_recursiveGen;
+            DCOMP._IOwnership _3382___v88;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3383_recIdents;
+            RAST._IExpr _out1276;
+            DCOMP._IOwnership _out1277;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1278;
+            (this).GenExpr((_3372_args).Select(_3380_i), selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out1276, out _out1277, out _out1278);
+            _3381_recursiveGen = _out1276;
+            _3382___v88 = _out1277;
+            _3383_recIdents = _out1278;
+            _3376_s = Dafny.Sequence<Dafny.Rune>.Concat(_3376_s, (_3381_recursiveGen)._ToString(DCOMP.__default.IND));
+            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _3383_recIdents);
+            _3380_i = (_3380_i) + (BigInteger.One);
+          }
+          _3376_s = Dafny.Sequence<Dafny.Rune>.Concat(_3376_s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("))"));
+          r = RAST.Expr.create_RawExpr(_3376_s);
+          RAST._IExpr _out1279;
+          DCOMP._IOwnership _out1280;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1279, out _out1280);
+          r = _out1279;
+          resultingOwnership = _out1280;
+          return ;
+        }
+      } else if (_source156.is_NewArray) {
+        Dafny.ISequence<DAST._IExpression> _3384___mcc_h7 = _source156.dtor_dims;
+        DAST._IType _3385___mcc_h8 = _source156.dtor_typ;
+        DAST._IType _3386_typ = _3385___mcc_h8;
+        Dafny.ISequence<DAST._IExpression> _3387_dims = _3384___mcc_h7;
+        {
+          BigInteger _3388_i;
+          _3388_i = (new BigInteger((_3387_dims).Count)) - (BigInteger.One);
+          RAST._IType _3389_genTyp;
+          RAST._IType _out1281;
+          _out1281 = (this).GenType(_3386_typ, false, false);
+          _3389_genTyp = _out1281;
+          Dafny.ISequence<Dafny.Rune> _3390_s;
+          _3390_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), (_3389_genTyp)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ::std::default::Default>::default()"));
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          while ((_3388_i).Sign != -1) {
+            RAST._IExpr _3391_recursiveGen;
+            DCOMP._IOwnership _3392___v89;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3393_recIdents;
+            RAST._IExpr _out1282;
+            DCOMP._IOwnership _out1283;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1284;
+            (this).GenExpr((_3387_dims).Select(_3388_i), selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out1282, out _out1283, out _out1284);
+            _3391_recursiveGen = _out1282;
+            _3392___v89 = _out1283;
+            _3393_recIdents = _out1284;
+            _3390_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::new(::std::cell::RefCell::new(vec!["), _3390_s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("; <usize as ::dafny_runtime::NumCast>::from(")), (_3391_recursiveGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").unwrap()]))"));
+            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _3393_recIdents);
+            _3388_i = (_3388_i) - (BigInteger.One);
+          }
+          r = RAST.Expr.create_RawExpr(_3390_s);
+          RAST._IExpr _out1285;
+          DCOMP._IOwnership _out1286;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1285, out _out1286);
+          r = _out1285;
+          resultingOwnership = _out1286;
+          return ;
+        }
+      } else if (_source156.is_DatatypeValue) {
+        Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3394___mcc_h9 = _source156.dtor_path;
+        Dafny.ISequence<DAST._IType> _3395___mcc_h10 = _source156.dtor_typeArgs;
+        Dafny.ISequence<Dafny.Rune> _3396___mcc_h11 = _source156.dtor_variant;
+        bool _3397___mcc_h12 = _source156.dtor_isCo;
+        Dafny.ISequence<_System._ITuple2<Dafny.ISequence<Dafny.Rune>, DAST._IExpression>> _3398___mcc_h13 = _source156.dtor_contents;
+        Dafny.ISequence<_System._ITuple2<Dafny.ISequence<Dafny.Rune>, DAST._IExpression>> _3399_values = _3398___mcc_h13;
+        bool _3400_isCo = _3397___mcc_h12;
+        Dafny.ISequence<Dafny.Rune> _3401_variant = _3396___mcc_h11;
+        Dafny.ISequence<DAST._IType> _3402_typeArgs = _3395___mcc_h10;
+        Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3403_path = _3394___mcc_h9;
+        {
+          Dafny.ISequence<Dafny.Rune> _3404_path;
+          Dafny.ISequence<Dafny.Rune> _out1287;
+          _out1287 = DCOMP.COMP.GenPath(_3403_path);
+          _3404_path = _out1287;
+          Dafny.ISequence<Dafny.Rune> _3405_s;
+          _3405_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::new("), _3404_path), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::"));
+          if ((new BigInteger((_3402_typeArgs).Count)).Sign == 1) {
+            _3405_s = Dafny.Sequence<Dafny.Rune>.Concat(_3405_s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"));
+            BigInteger _3406_i;
+            _3406_i = BigInteger.Zero;
+            while ((_3406_i) < (new BigInteger((_3402_typeArgs).Count))) {
+              if ((_3406_i).Sign == 1) {
+                _3405_s = Dafny.Sequence<Dafny.Rune>.Concat(_3405_s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
+              }
+              RAST._IType _3407_typeExpr;
+              RAST._IType _out1288;
+              _out1288 = (this).GenType((_3402_typeArgs).Select(_3406_i), false, false);
+              _3407_typeExpr = _out1288;
+              _3405_s = Dafny.Sequence<Dafny.Rune>.Concat(_3405_s, (_3407_typeExpr)._ToString(DCOMP.__default.IND));
+              _3406_i = (_3406_i) + (BigInteger.One);
+            }
+            _3405_s = Dafny.Sequence<Dafny.Rune>.Concat(_3405_s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">::"));
+          }
+          _3405_s = Dafny.Sequence<Dafny.Rune>.Concat(_3405_s, DCOMP.__default.escapeIdent(_3401_variant));
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          BigInteger _3408_i;
+          _3408_i = BigInteger.Zero;
+          _3405_s = Dafny.Sequence<Dafny.Rune>.Concat(_3405_s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {"));
+          while ((_3408_i) < (new BigInteger((_3399_values).Count))) {
+            _System._ITuple2<Dafny.ISequence<Dafny.Rune>, DAST._IExpression> _let_tmp_rhs60 = (_3399_values).Select(_3408_i);
+            Dafny.ISequence<Dafny.Rune> _3409_name = _let_tmp_rhs60.dtor__0;
+            DAST._IExpression _3410_value = _let_tmp_rhs60.dtor__1;
+            if ((_3408_i).Sign == 1) {
+              _3405_s = Dafny.Sequence<Dafny.Rune>.Concat(_3405_s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
+            }
+            if (_3400_isCo) {
+              RAST._IExpr _3411_recursiveGen;
+              DCOMP._IOwnership _3412___v90;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3413_recIdents;
+              RAST._IExpr _out1289;
+              DCOMP._IOwnership _out1290;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1291;
+              (this).GenExpr(_3410_value, selfIdent, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(), DCOMP.Ownership.create_OwnershipOwned(), out _out1289, out _out1290, out _out1291);
+              _3411_recursiveGen = _out1289;
+              _3412___v90 = _out1290;
+              _3413_recIdents = _out1291;
+              readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _3413_recIdents);
+              Dafny.ISequence<Dafny.Rune> _3414_allReadCloned;
+              _3414_allReadCloned = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
+              while (!(_3413_recIdents).Equals(Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements())) {
+                Dafny.ISequence<Dafny.Rune> _3415_next;
+                foreach (Dafny.ISequence<Dafny.Rune> _assign_such_that_2 in (_3413_recIdents).Elements) {
+                  _3415_next = (Dafny.ISequence<Dafny.Rune>)_assign_such_that_2;
+                  if ((_3413_recIdents).Contains(_3415_next)) {
+                    goto after__ASSIGN_SUCH_THAT_2;
+                  }
+                }
+                throw new System.Exception("assign-such-that search produced no value (line 2846)");
+              after__ASSIGN_SUCH_THAT_2: ;
+                _3414_allReadCloned = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3414_allReadCloned, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("let ")), DCOMP.__default.escapeIdent(_3415_next)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" = ")), DCOMP.__default.escapeIdent(_3415_next)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".clone();\n"));
+                _3413_recIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Difference(_3413_recIdents, Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements(_3415_next));
+              }
+              _3405_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3405_s, DCOMP.__default.escapeIdent(_3409_name)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(": ::dafny_runtime::LazyFieldWrapper(::dafny_runtime::Lazy::new(::std::boxed::Box::new({\n")), _3414_allReadCloned), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("move || (")), (_3411_recursiveGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")})))"));
+            } else {
+              RAST._IExpr _3416_recursiveGen;
+              DCOMP._IOwnership _3417___v91;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3418_recIdents;
+              RAST._IExpr _out1292;
+              DCOMP._IOwnership _out1293;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1294;
+              (this).GenExpr(_3410_value, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out1292, out _out1293, out _out1294);
+              _3416_recursiveGen = _out1292;
+              _3417___v91 = _out1293;
+              _3418_recIdents = _out1294;
+              _3405_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_3405_s, DCOMP.__default.escapeIdent(_3409_name)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(": ")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), (_3416_recursiveGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
+              readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _3418_recIdents);
+            }
+            _3408_i = (_3408_i) + (BigInteger.One);
+          }
+          _3405_s = Dafny.Sequence<Dafny.Rune>.Concat(_3405_s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" })"));
+          r = RAST.Expr.create_RawExpr(_3405_s);
+          RAST._IExpr _out1295;
+          DCOMP._IOwnership _out1296;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1295, out _out1296);
+          r = _out1295;
+          resultingOwnership = _out1296;
+          return ;
+        }
+      } else if (_source156.is_Convert) {
+        DAST._IExpression _3419___mcc_h14 = _source156.dtor_value;
+        DAST._IType _3420___mcc_h15 = _source156.dtor_from;
+        DAST._IType _3421___mcc_h16 = _source156.dtor_typ;
+        {
+          RAST._IExpr _out1297;
+          DCOMP._IOwnership _out1298;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1299;
+          (this).GenExprConvert(e, selfIdent, @params, expectedOwnership, out _out1297, out _out1298, out _out1299);
+          r = _out1297;
+          resultingOwnership = _out1298;
+          readIdents = _out1299;
+        }
+      } else if (_source156.is_SeqConstruct) {
+        DAST._IExpression _3422___mcc_h17 = _source156.dtor_length;
+        DAST._IExpression _3423___mcc_h18 = _source156.dtor_elem;
+        DAST._IExpression _3424_expr = _3423___mcc_h18;
+        DAST._IExpression _3425_length = _3422___mcc_h17;
+        {
+          RAST._IExpr _3426_recursiveGen;
+          DCOMP._IOwnership _3427___v95;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3428_recIdents;
+          RAST._IExpr _out1300;
+          DCOMP._IOwnership _out1301;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1302;
+          (this).GenExpr(_3424_expr, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out1300, out _out1301, out _out1302);
+          _3426_recursiveGen = _out1300;
+          _3427___v95 = _out1301;
+          _3428_recIdents = _out1302;
+          RAST._IExpr _3429_lengthGen;
+          DCOMP._IOwnership _3430___v96;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3431_lengthIdents;
+          RAST._IExpr _out1303;
+          DCOMP._IOwnership _out1304;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1305;
+          (this).GenExpr(_3425_length, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out1303, out _out1304, out _out1305);
+          _3429_lengthGen = _out1303;
+          _3430___v96 = _out1304;
+          _3431_lengthIdents = _out1305;
+          r = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("{\nlet _initializer = "), (_3426_recursiveGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";\n::dafny_runtime::integer_range(::dafny_runtime::Zero::zero(), ")), (_3429_lengthGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").map(|i| _initializer.0(&i)).collect::<::dafny_runtime::Sequence<_>>()\n}")));
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(_3428_recIdents, _3431_lengthIdents);
+          RAST._IExpr _out1306;
+          DCOMP._IOwnership _out1307;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1306, out _out1307);
+          r = _out1306;
+          resultingOwnership = _out1307;
+          return ;
+        }
+      } else if (_source156.is_SeqValue) {
+        Dafny.ISequence<DAST._IExpression> _3432___mcc_h19 = _source156.dtor_elements;
+        DAST._IType _3433___mcc_h20 = _source156.dtor_typ;
+        DAST._IType _3434_typ = _3433___mcc_h20;
+        Dafny.ISequence<DAST._IExpression> _3435_exprs = _3432___mcc_h19;
+        {
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          RAST._IType _3436_genTpe;
+          RAST._IType _out1308;
+          _out1308 = (this).GenType(_3434_typ, false, false);
+          _3436_genTpe = _out1308;
+          BigInteger _3437_i;
+          _3437_i = BigInteger.Zero;
+          Dafny.ISequence<RAST._IExpr> _3438_args;
+          _3438_args = Dafny.Sequence<RAST._IExpr>.FromElements();
+          while ((_3437_i) < (new BigInteger((_3435_exprs).Count))) {
+            RAST._IExpr _3439_recursiveGen;
+            DCOMP._IOwnership _3440___v97;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3441_recIdents;
+            RAST._IExpr _out1309;
+            DCOMP._IOwnership _out1310;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1311;
+            (this).GenExpr((_3435_exprs).Select(_3437_i), selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out1309, out _out1310, out _out1311);
+            _3439_recursiveGen = _out1309;
+            _3440___v97 = _out1310;
+            _3441_recIdents = _out1311;
+            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _3441_recIdents);
+            _3438_args = Dafny.Sequence<RAST._IExpr>.Concat(_3438_args, Dafny.Sequence<RAST._IExpr>.FromElements(_3439_recursiveGen));
+            _3437_i = (_3437_i) + (BigInteger.One);
+          }
+          r = ((RAST.__default.dafny__runtime).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("seq!"))).Apply(Dafny.Sequence<RAST._IType>.FromElements(), _3438_args);
+          if ((new BigInteger((_3438_args).Count)).Sign == 0) {
+            r = RAST.Expr.create_TypeAscription(r, ((RAST.__default.dafny__runtime__type).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Sequence"))).Apply1(_3436_genTpe));
+          }
+          RAST._IExpr _out1312;
+          DCOMP._IOwnership _out1313;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1312, out _out1313);
+          r = _out1312;
+          resultingOwnership = _out1313;
+          return ;
+        }
+      } else if (_source156.is_SetValue) {
+        Dafny.ISequence<DAST._IExpression> _3442___mcc_h21 = _source156.dtor_elements;
+        Dafny.ISequence<DAST._IExpression> _3443_exprs = _3442___mcc_h21;
+        {
+          Dafny.ISequence<RAST._IExpr> _3444_generatedValues;
+          _3444_generatedValues = Dafny.Sequence<RAST._IExpr>.FromElements();
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          BigInteger _3445_i;
+          _3445_i = BigInteger.Zero;
+          while ((_3445_i) < (new BigInteger((_3443_exprs).Count))) {
+            RAST._IExpr _3446_recursiveGen;
+            DCOMP._IOwnership _3447___v98;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3448_recIdents;
+            RAST._IExpr _out1314;
+            DCOMP._IOwnership _out1315;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1316;
+            (this).GenExpr((_3443_exprs).Select(_3445_i), selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out1314, out _out1315, out _out1316);
+            _3446_recursiveGen = _out1314;
+            _3447___v98 = _out1315;
+            _3448_recIdents = _out1316;
+            _3444_generatedValues = Dafny.Sequence<RAST._IExpr>.Concat(_3444_generatedValues, Dafny.Sequence<RAST._IExpr>.FromElements(_3446_recursiveGen));
+            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _3448_recIdents);
+            _3445_i = (_3445_i) + (BigInteger.One);
+          }
+          r = ((RAST.__default.dafny__runtime).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("set!"))).Apply(Dafny.Sequence<RAST._IType>.FromElements(), _3444_generatedValues);
+          RAST._IExpr _out1317;
+          DCOMP._IOwnership _out1318;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1317, out _out1318);
+          r = _out1317;
+          resultingOwnership = _out1318;
+          return ;
+        }
+      } else if (_source156.is_MultisetValue) {
+        Dafny.ISequence<DAST._IExpression> _3449___mcc_h22 = _source156.dtor_elements;
+        Dafny.ISequence<DAST._IExpression> _3450_exprs = _3449___mcc_h22;
+        {
+          Dafny.ISequence<RAST._IExpr> _3451_generatedValues;
+          _3451_generatedValues = Dafny.Sequence<RAST._IExpr>.FromElements();
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          BigInteger _3452_i;
+          _3452_i = BigInteger.Zero;
+          while ((_3452_i) < (new BigInteger((_3450_exprs).Count))) {
+            RAST._IExpr _3453_recursiveGen;
+            DCOMP._IOwnership _3454___v99;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3455_recIdents;
+            RAST._IExpr _out1319;
+            DCOMP._IOwnership _out1320;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1321;
+            (this).GenExpr((_3450_exprs).Select(_3452_i), selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out1319, out _out1320, out _out1321);
+            _3453_recursiveGen = _out1319;
+            _3454___v99 = _out1320;
+            _3455_recIdents = _out1321;
+            _3451_generatedValues = Dafny.Sequence<RAST._IExpr>.Concat(_3451_generatedValues, Dafny.Sequence<RAST._IExpr>.FromElements(_3453_recursiveGen));
+            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _3455_recIdents);
+            _3452_i = (_3452_i) + (BigInteger.One);
+          }
+          r = ((RAST.__default.dafny__runtime).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("multiset!"))).Apply(Dafny.Sequence<RAST._IType>.FromElements(), _3451_generatedValues);
+          RAST._IExpr _out1322;
+          DCOMP._IOwnership _out1323;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1322, out _out1323);
+          r = _out1322;
+          resultingOwnership = _out1323;
+          return ;
+        }
+      } else if (_source156.is_MapValue) {
+        Dafny.ISequence<_System._ITuple2<DAST._IExpression, DAST._IExpression>> _3456___mcc_h23 = _source156.dtor_mapElems;
+        Dafny.ISequence<_System._ITuple2<DAST._IExpression, DAST._IExpression>> _3457_mapElems = _3456___mcc_h23;
+        {
+          Dafny.ISequence<_System._ITuple2<RAST._IExpr, RAST._IExpr>> _3458_generatedValues;
+          _3458_generatedValues = Dafny.Sequence<_System._ITuple2<RAST._IExpr, RAST._IExpr>>.FromElements();
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          BigInteger _3459_i;
+          _3459_i = BigInteger.Zero;
+          while ((_3459_i) < (new BigInteger((_3457_mapElems).Count))) {
+            RAST._IExpr _3460_recursiveGenKey;
+            DCOMP._IOwnership _3461___v101;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3462_recIdentsKey;
+            RAST._IExpr _out1324;
+            DCOMP._IOwnership _out1325;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1326;
+            (this).GenExpr(((_3457_mapElems).Select(_3459_i)).dtor__0, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out1324, out _out1325, out _out1326);
+            _3460_recursiveGenKey = _out1324;
+            _3461___v101 = _out1325;
+            _3462_recIdentsKey = _out1326;
+            RAST._IExpr _3463_recursiveGenValue;
+            DCOMP._IOwnership _3464___v102;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3465_recIdentsValue;
+            RAST._IExpr _out1327;
+            DCOMP._IOwnership _out1328;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1329;
+            (this).GenExpr(((_3457_mapElems).Select(_3459_i)).dtor__1, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out1327, out _out1328, out _out1329);
+            _3463_recursiveGenValue = _out1327;
+            _3464___v102 = _out1328;
+            _3465_recIdentsValue = _out1329;
+            _3458_generatedValues = Dafny.Sequence<_System._ITuple2<RAST._IExpr, RAST._IExpr>>.Concat(_3458_generatedValues, Dafny.Sequence<_System._ITuple2<RAST._IExpr, RAST._IExpr>>.FromElements(_System.Tuple2<RAST._IExpr, RAST._IExpr>.create(_3460_recursiveGenKey, _3463_recursiveGenValue)));
+            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _3462_recIdentsKey), _3465_recIdentsValue);
+            _3459_i = (_3459_i) + (BigInteger.One);
+          }
+          _3459_i = BigInteger.Zero;
+          Dafny.ISequence<RAST._IExpr> _3466_arguments;
+          _3466_arguments = Dafny.Sequence<RAST._IExpr>.FromElements();
+          while ((_3459_i) < (new BigInteger((_3458_generatedValues).Count))) {
+            RAST._IExpr _3467_genKey;
+            _3467_genKey = ((_3458_generatedValues).Select(_3459_i)).dtor__0;
+            RAST._IExpr _3468_genValue;
+            _3468_genValue = ((_3458_generatedValues).Select(_3459_i)).dtor__1;
+            _3466_arguments = Dafny.Sequence<RAST._IExpr>.Concat(_3466_arguments, Dafny.Sequence<RAST._IExpr>.FromElements(RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("=>"), _3467_genKey, _3468_genValue, DAST.Format.BinaryOpFormat.create_NoFormat())));
+            _3459_i = (_3459_i) + (BigInteger.One);
+          }
+          r = ((RAST.__default.dafny__runtime).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("map!"))).Apply(Dafny.Sequence<RAST._IType>.FromElements(), _3466_arguments);
+          RAST._IExpr _out1330;
+          DCOMP._IOwnership _out1331;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1330, out _out1331);
+          r = _out1330;
+          resultingOwnership = _out1331;
+          return ;
+        }
+      } else if (_source156.is_MapBuilder) {
+        DAST._IType _3469___mcc_h24 = _source156.dtor_keyType;
+        DAST._IType _3470___mcc_h25 = _source156.dtor_valueType;
+        DAST._IType _3471_valueType = _3470___mcc_h25;
+        DAST._IType _3472_keyType = _3469___mcc_h24;
+        {
+          RAST._IType _3473_kType;
+          RAST._IType _out1332;
+          _out1332 = (this).GenType(_3472_keyType, false, false);
+          _3473_kType = _out1332;
+          RAST._IType _3474_vType;
+          RAST._IType _out1333;
+          _out1333 = (this).GenType(_3471_valueType, false, false);
+          _3474_vType = _out1333;
+          r = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::MapBuilder::<"), (_3473_kType)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), (_3474_vType)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">::new()")));
+          RAST._IExpr _out1334;
+          DCOMP._IOwnership _out1335;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1334, out _out1335);
+          r = _out1334;
+          resultingOwnership = _out1335;
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          return ;
+        }
+      } else if (_source156.is_SeqUpdate) {
+        DAST._IExpression _3475___mcc_h26 = _source156.dtor_expr;
+        DAST._IExpression _3476___mcc_h27 = _source156.dtor_indexExpr;
+        DAST._IExpression _3477___mcc_h28 = _source156.dtor_value;
+        DAST._IExpression _3478_value = _3477___mcc_h28;
+        DAST._IExpression _3479_index = _3476___mcc_h27;
+        DAST._IExpression _3480_expr = _3475___mcc_h26;
+        {
+          RAST._IExpr _3481_exprR;
+          DCOMP._IOwnership _3482___v103;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3483_exprIdents;
+          RAST._IExpr _out1336;
+          DCOMP._IOwnership _out1337;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1338;
+          (this).GenExpr(_3480_expr, selfIdent, @params, DCOMP.Ownership.create_OwnershipAutoBorrowed(), out _out1336, out _out1337, out _out1338);
+          _3481_exprR = _out1336;
+          _3482___v103 = _out1337;
+          _3483_exprIdents = _out1338;
+          RAST._IExpr _3484_indexR;
+          DCOMP._IOwnership _3485_indexOwnership;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3486_indexIdents;
+          RAST._IExpr _out1339;
+          DCOMP._IOwnership _out1340;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1341;
+          (this).GenExpr(_3479_index, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1339, out _out1340, out _out1341);
+          _3484_indexR = _out1339;
+          _3485_indexOwnership = _out1340;
+          _3486_indexIdents = _out1341;
+          RAST._IExpr _3487_valueR;
+          DCOMP._IOwnership _3488_valueOwnership;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3489_valueIdents;
+          RAST._IExpr _out1342;
+          DCOMP._IOwnership _out1343;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1344;
+          (this).GenExpr(_3478_value, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1342, out _out1343, out _out1344);
+          _3487_valueR = _out1342;
+          _3488_valueOwnership = _out1343;
+          _3489_valueIdents = _out1344;
+          r = ((_3481_exprR).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("update_index"))).Apply(Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_3484_indexR, _3487_valueR));
+          RAST._IExpr _out1345;
+          DCOMP._IOwnership _out1346;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1345, out _out1346);
+          r = _out1345;
+          resultingOwnership = _out1346;
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(_3483_exprIdents, _3486_indexIdents), _3489_valueIdents);
+          return ;
+        }
+      } else if (_source156.is_MapUpdate) {
+        DAST._IExpression _3490___mcc_h29 = _source156.dtor_expr;
+        DAST._IExpression _3491___mcc_h30 = _source156.dtor_indexExpr;
+        DAST._IExpression _3492___mcc_h31 = _source156.dtor_value;
+        DAST._IExpression _3493_value = _3492___mcc_h31;
+        DAST._IExpression _3494_index = _3491___mcc_h30;
+        DAST._IExpression _3495_expr = _3490___mcc_h29;
+        {
+          RAST._IExpr _3496_exprR;
+          DCOMP._IOwnership _3497___v104;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3498_exprIdents;
+          RAST._IExpr _out1347;
+          DCOMP._IOwnership _out1348;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1349;
+          (this).GenExpr(_3495_expr, selfIdent, @params, DCOMP.Ownership.create_OwnershipAutoBorrowed(), out _out1347, out _out1348, out _out1349);
+          _3496_exprR = _out1347;
+          _3497___v104 = _out1348;
+          _3498_exprIdents = _out1349;
+          RAST._IExpr _3499_indexR;
+          DCOMP._IOwnership _3500_indexOwnership;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3501_indexIdents;
+          RAST._IExpr _out1350;
+          DCOMP._IOwnership _out1351;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1352;
+          (this).GenExpr(_3494_index, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1350, out _out1351, out _out1352);
+          _3499_indexR = _out1350;
+          _3500_indexOwnership = _out1351;
+          _3501_indexIdents = _out1352;
+          RAST._IExpr _3502_valueR;
+          DCOMP._IOwnership _3503_valueOwnership;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3504_valueIdents;
+          RAST._IExpr _out1353;
+          DCOMP._IOwnership _out1354;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1355;
+          (this).GenExpr(_3493_value, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1353, out _out1354, out _out1355);
+          _3502_valueR = _out1353;
+          _3503_valueOwnership = _out1354;
+          _3504_valueIdents = _out1355;
+          r = ((_3496_exprR).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("update_index"))).Apply(Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(_3499_indexR, _3502_valueR));
+          RAST._IExpr _out1356;
+          DCOMP._IOwnership _out1357;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1356, out _out1357);
+          r = _out1356;
+          resultingOwnership = _out1357;
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(_3498_exprIdents, _3501_indexIdents), _3504_valueIdents);
+          return ;
+        }
+      } else if (_source156.is_SetBuilder) {
+        DAST._IType _3505___mcc_h32 = _source156.dtor_elemType;
+        DAST._IType _3506_elemType = _3505___mcc_h32;
+        {
+          RAST._IType _3507_eType;
+          RAST._IType _out1358;
+          _out1358 = (this).GenType(_3506_elemType, false, false);
+          _3507_eType = _out1358;
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          r = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::SetBuilder::<"), (_3507_eType)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">::new()")));
+          RAST._IExpr _out1359;
+          DCOMP._IOwnership _out1360;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1359, out _out1360);
+          r = _out1359;
+          resultingOwnership = _out1360;
+          return ;
+        }
+      } else if (_source156.is_ToMultiset) {
+        DAST._IExpression _3508___mcc_h33 = _source156.dtor_ToMultiset_a0;
+        DAST._IExpression _3509_expr = _3508___mcc_h33;
+        {
+          RAST._IExpr _3510_recursiveGen;
+          DCOMP._IOwnership _3511___v100;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3512_recIdents;
+          RAST._IExpr _out1361;
+          DCOMP._IOwnership _out1362;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1363;
+          (this).GenExpr(_3509_expr, selfIdent, @params, DCOMP.Ownership.create_OwnershipAutoBorrowed(), out _out1361, out _out1362, out _out1363);
+          _3510_recursiveGen = _out1361;
+          _3511___v100 = _out1362;
+          _3512_recIdents = _out1363;
+          r = ((_3510_recursiveGen).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("as_dafny_multiset"))).Apply(Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+          readIdents = _3512_recIdents;
+          RAST._IExpr _out1364;
+          DCOMP._IOwnership _out1365;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1364, out _out1365);
+          r = _out1364;
+          resultingOwnership = _out1365;
+          return ;
+        }
+      } else if (_source156.is_This) {
+        {
+          Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _source157 = selfIdent;
+          if (_source157.is_None) {
+            {
+              r = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("panic!(\"this outside of a method\")"));
+              RAST._IExpr _out1366;
+              DCOMP._IOwnership _out1367;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1366, out _out1367);
+              r = _out1366;
+              resultingOwnership = _out1367;
+              readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+            }
+          } else {
+            Dafny.ISequence<Dafny.Rune> _3513___mcc_h273 = _source157.dtor_value;
+            Dafny.ISequence<Dafny.Rune> _3514_id = _3513___mcc_h273;
+            {
+              r = RAST.Expr.create_RawExpr(_3514_id);
+              if (object.Equals(expectedOwnership, DCOMP.Ownership.create_OwnershipOwned())) {
+                r = RAST.__default.Clone(r);
+                resultingOwnership = DCOMP.Ownership.create_OwnershipOwned();
+              } else if ((object.Equals(expectedOwnership, DCOMP.Ownership.create_OwnershipBorrowed())) || (object.Equals(expectedOwnership, DCOMP.Ownership.create_OwnershipAutoBorrowed()))) {
+                if (!(_3514_id).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("self"))) {
+                  r = RAST.__default.Borrow(r);
+                }
+                resultingOwnership = DCOMP.Ownership.create_OwnershipBorrowed();
+              } else {
+                if (!(_3514_id).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("self"))) {
+                  r = RAST.__default.BorrowMut(r);
+                }
+                resultingOwnership = DCOMP.Ownership.create_OwnershipBorrowedMut();
+              }
+              readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements(_3514_id);
+            }
+          }
+          return ;
+        }
+      } else if (_source156.is_Ite) {
+        DAST._IExpression _3515___mcc_h34 = _source156.dtor_cond;
+        DAST._IExpression _3516___mcc_h35 = _source156.dtor_thn;
+        DAST._IExpression _3517___mcc_h36 = _source156.dtor_els;
+        DAST._IExpression _3518_f = _3517___mcc_h36;
+        DAST._IExpression _3519_t = _3516___mcc_h35;
+        DAST._IExpression _3520_cond = _3515___mcc_h34;
+        {
+          RAST._IExpr _3521_cond;
+          DCOMP._IOwnership _3522___v105;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3523_recIdentsCond;
+          RAST._IExpr _out1368;
+          DCOMP._IOwnership _out1369;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1370;
+          (this).GenExpr(_3520_cond, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out1368, out _out1369, out _out1370);
+          _3521_cond = _out1368;
+          _3522___v105 = _out1369;
+          _3523_recIdentsCond = _out1370;
+          Dafny.ISequence<Dafny.Rune> _3524_condString;
+          _3524_condString = (_3521_cond)._ToString(DCOMP.__default.IND);
+          RAST._IExpr _3525___v106;
+          DCOMP._IOwnership _3526_tHasToBeOwned;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3527___v107;
+          RAST._IExpr _out1371;
+          DCOMP._IOwnership _out1372;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1373;
+          (this).GenExpr(_3519_t, selfIdent, @params, expectedOwnership, out _out1371, out _out1372, out _out1373);
+          _3525___v106 = _out1371;
+          _3526_tHasToBeOwned = _out1372;
+          _3527___v107 = _out1373;
+          RAST._IExpr _3528_fExpr;
+          DCOMP._IOwnership _3529_fOwned;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3530_recIdentsF;
+          RAST._IExpr _out1374;
+          DCOMP._IOwnership _out1375;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1376;
+          (this).GenExpr(_3518_f, selfIdent, @params, _3526_tHasToBeOwned, out _out1374, out _out1375, out _out1376);
+          _3528_fExpr = _out1374;
+          _3529_fOwned = _out1375;
+          _3530_recIdentsF = _out1376;
+          Dafny.ISequence<Dafny.Rune> _3531_fString;
+          _3531_fString = (_3528_fExpr)._ToString(DCOMP.__default.IND);
+          RAST._IExpr _3532_tExpr;
+          DCOMP._IOwnership _3533___v108;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3534_recIdentsT;
+          RAST._IExpr _out1377;
+          DCOMP._IOwnership _out1378;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1379;
+          (this).GenExpr(_3519_t, selfIdent, @params, _3529_fOwned, out _out1377, out _out1378, out _out1379);
+          _3532_tExpr = _out1377;
+          _3533___v108 = _out1378;
+          _3534_recIdentsT = _out1379;
+          Dafny.ISequence<Dafny.Rune> _3535_tString;
+          _3535_tString = (_3532_tExpr)._ToString(DCOMP.__default.IND);
+          r = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(if "), _3524_condString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {\n")), _3535_tString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n} else {\n")), _3531_fString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n})")));
+          RAST._IExpr _out1380;
+          DCOMP._IOwnership _out1381;
+          DCOMP.COMP.FromOwnership(r, _3529_fOwned, expectedOwnership, out _out1380, out _out1381);
+          r = _out1380;
+          resultingOwnership = _out1381;
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(_3523_recIdentsCond, _3534_recIdentsT), _3530_recIdentsF);
+          return ;
+        }
+      } else if (_source156.is_UnOp) {
+        DAST._IUnaryOp _3536___mcc_h37 = _source156.dtor_unOp;
+        DAST._IExpression _3537___mcc_h38 = _source156.dtor_expr;
+        DAST.Format._IUnaryOpFormat _3538___mcc_h39 = _source156.dtor_format1;
+        DAST._IUnaryOp _source158 = _3536___mcc_h37;
+        if (_source158.is_Not) {
+          DAST.Format._IUnaryOpFormat _3539_format = _3538___mcc_h39;
+          DAST._IExpression _3540_e = _3537___mcc_h38;
+          {
+            RAST._IExpr _3541_recursiveGen;
+            DCOMP._IOwnership _3542___v109;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3543_recIdents;
+            RAST._IExpr _out1382;
+            DCOMP._IOwnership _out1383;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1384;
+            (this).GenExpr(_3540_e, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out1382, out _out1383, out _out1384);
+            _3541_recursiveGen = _out1382;
+            _3542___v109 = _out1383;
+            _3543_recIdents = _out1384;
+            r = RAST.Expr.create_UnaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!"), _3541_recursiveGen, _3539_format);
+            RAST._IExpr _out1385;
+            DCOMP._IOwnership _out1386;
+            DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1385, out _out1386);
+            r = _out1385;
+            resultingOwnership = _out1386;
+            readIdents = _3543_recIdents;
+            return ;
+          }
+        } else if (_source158.is_BitwiseNot) {
+          DAST.Format._IUnaryOpFormat _3544_format = _3538___mcc_h39;
+          DAST._IExpression _3545_e = _3537___mcc_h38;
+          {
+            RAST._IExpr _3546_recursiveGen;
+            DCOMP._IOwnership _3547___v110;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3548_recIdents;
+            RAST._IExpr _out1387;
+            DCOMP._IOwnership _out1388;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1389;
+            (this).GenExpr(_3545_e, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out1387, out _out1388, out _out1389);
+            _3546_recursiveGen = _out1387;
+            _3547___v110 = _out1388;
+            _3548_recIdents = _out1389;
+            r = RAST.Expr.create_UnaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("~"), _3546_recursiveGen, _3544_format);
+            RAST._IExpr _out1390;
+            DCOMP._IOwnership _out1391;
+            DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1390, out _out1391);
+            r = _out1390;
+            resultingOwnership = _out1391;
+            readIdents = _3548_recIdents;
+            return ;
+          }
+        } else {
+          DAST.Format._IUnaryOpFormat _3549_format = _3538___mcc_h39;
+          DAST._IExpression _3550_e = _3537___mcc_h38;
+          {
+            RAST._IExpr _3551_recursiveGen;
+            DCOMP._IOwnership _3552_recOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3553_recIdents;
+            RAST._IExpr _out1392;
+            DCOMP._IOwnership _out1393;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1394;
+            (this).GenExpr(_3550_e, selfIdent, @params, DCOMP.Ownership.create_OwnershipAutoBorrowed(), out _out1392, out _out1393, out _out1394);
+            _3551_recursiveGen = _out1392;
+            _3552_recOwned = _out1393;
+            _3553_recIdents = _out1394;
+            r = ((_3551_recursiveGen).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("cardinality"))).Apply(Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+            RAST._IExpr _out1395;
+            DCOMP._IOwnership _out1396;
+            DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1395, out _out1396);
+            r = _out1395;
+            resultingOwnership = _out1396;
+            readIdents = _3553_recIdents;
+            return ;
+          }
+        }
+      } else if (_source156.is_BinOp) {
+        DAST._IBinOp _3554___mcc_h40 = _source156.dtor_op;
+        DAST._IExpression _3555___mcc_h41 = _source156.dtor_left;
+        DAST._IExpression _3556___mcc_h42 = _source156.dtor_right;
+        DAST.Format._IBinaryOpFormat _3557___mcc_h43 = _source156.dtor_format2;
+        RAST._IExpr _out1397;
+        DCOMP._IOwnership _out1398;
+        Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1399;
+        (this).GenExprBinary(e, selfIdent, @params, expectedOwnership, out _out1397, out _out1398, out _out1399);
+        r = _out1397;
+        resultingOwnership = _out1398;
+        readIdents = _out1399;
+      } else if (_source156.is_ArrayLen) {
+        DAST._IExpression _3558___mcc_h44 = _source156.dtor_expr;
+        BigInteger _3559___mcc_h45 = _source156.dtor_dim;
+        BigInteger _3560_dim = _3559___mcc_h45;
+        DAST._IExpression _3561_expr = _3558___mcc_h44;
+        {
+          RAST._IExpr _3562_recursiveGen;
+          DCOMP._IOwnership _3563___v115;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3564_recIdents;
+          RAST._IExpr _out1400;
+          DCOMP._IOwnership _out1401;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1402;
+          (this).GenExpr(_3561_expr, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out1400, out _out1401, out _out1402);
+          _3562_recursiveGen = _out1400;
+          _3563___v115 = _out1401;
+          _3564_recIdents = _out1402;
+          if ((_3560_dim).Sign == 0) {
+            r = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::BigInt::from(("), (_3562_recursiveGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").borrow().len())")));
+          } else {
+            Dafny.ISequence<Dafny.Rune> _3565_s;
+            _3565_s = (RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::BigInt::from(m.borrow().len())")))._ToString(DCOMP.__default.IND);
+            BigInteger _3566_i;
+            _3566_i = BigInteger.One;
+            while ((_3566_i) < (_3560_dim)) {
+              _3565_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("m.borrow().get(0).map(|m| "), _3565_s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").unwrap_or(::dafny_runtime::BigInt::from(0))"));
+              _3566_i = (_3566_i) + (BigInteger.One);
+            }
+            r = RAST.__default.RcNew(RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), (_3562_recursiveGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow().get(0).map(|m| ")), _3565_s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").unwrap_or(::dafny_runtime::BigInt::from(0))"))));
+          }
+          RAST._IExpr _out1403;
+          DCOMP._IOwnership _out1404;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1403, out _out1404);
+          r = _out1403;
+          resultingOwnership = _out1404;
+          readIdents = _3564_recIdents;
+          return ;
+        }
+      } else if (_source156.is_MapKeys) {
+        DAST._IExpression _3567___mcc_h46 = _source156.dtor_expr;
+        DAST._IExpression _3568_expr = _3567___mcc_h46;
+        {
+          RAST._IExpr _3569_recursiveGen;
+          DCOMP._IOwnership _3570___v116;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3571_recIdents;
+          RAST._IExpr _out1405;
+          DCOMP._IOwnership _out1406;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1407;
+          (this).GenExpr(_3568_expr, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out1405, out _out1406, out _out1407);
+          _3569_recursiveGen = _out1405;
+          _3570___v116 = _out1406;
+          _3571_recIdents = _out1407;
+          readIdents = _3571_recIdents;
+          r = RAST.Expr.create_Call((_3569_recursiveGen).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("keys")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+          RAST._IExpr _out1408;
+          DCOMP._IOwnership _out1409;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1408, out _out1409);
+          r = _out1408;
+          resultingOwnership = _out1409;
+          return ;
+        }
+      } else if (_source156.is_MapValues) {
+        DAST._IExpression _3572___mcc_h47 = _source156.dtor_expr;
+        DAST._IExpression _3573_expr = _3572___mcc_h47;
+        {
+          RAST._IExpr _3574_recursiveGen;
+          DCOMP._IOwnership _3575___v117;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3576_recIdents;
+          RAST._IExpr _out1410;
+          DCOMP._IOwnership _out1411;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1412;
+          (this).GenExpr(_3573_expr, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out1410, out _out1411, out _out1412);
+          _3574_recursiveGen = _out1410;
+          _3575___v117 = _out1411;
+          _3576_recIdents = _out1412;
+          readIdents = _3576_recIdents;
+          r = RAST.Expr.create_Call((_3574_recursiveGen).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("values")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+          RAST._IExpr _out1413;
+          DCOMP._IOwnership _out1414;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1413, out _out1414);
+          r = _out1413;
+          resultingOwnership = _out1414;
+          return ;
+        }
+      } else if (_source156.is_Select) {
+        DAST._IExpression _3577___mcc_h48 = _source156.dtor_expr;
+        Dafny.ISequence<Dafny.Rune> _3578___mcc_h49 = _source156.dtor_field;
+        bool _3579___mcc_h50 = _source156.dtor_isConstant;
+        bool _3580___mcc_h51 = _source156.dtor_onDatatype;
+        DAST._IExpression _source159 = _3577___mcc_h48;
+        if (_source159.is_Literal) {
+          DAST._ILiteral _3581___mcc_h52 = _source159.dtor_Literal_a0;
+          bool _3582_isDatatype = _3580___mcc_h51;
+          bool _3583_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3584_field = _3578___mcc_h49;
+          DAST._IExpression _3585_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3586_onExpr;
+            DCOMP._IOwnership _3587_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3588_recIdents;
+            RAST._IExpr _out1415;
+            DCOMP._IOwnership _out1416;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1417;
+            (this).GenExpr(_3585_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1415, out _out1416, out _out1417);
+            _3586_onExpr = _out1415;
+            _3587_onOwned = _out1416;
+            _3588_recIdents = _out1417;
+            if ((_3582_isDatatype) || (_3583_isConstant)) {
+              r = RAST.Expr.create_Call((_3586_onExpr).Sel(DCOMP.__default.escapeIdent(_3584_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1418;
+              DCOMP._IOwnership _out1419;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1418, out _out1419);
+              r = _out1418;
+              resultingOwnership = _out1419;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3589_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3589_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3586_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3584_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1420;
+              DCOMP._IOwnership _out1421;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3589_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1420, out _out1421);
+              r = _out1420;
+              resultingOwnership = _out1421;
+            }
+            readIdents = _3588_recIdents;
+            return ;
+          }
+        } else if (_source159.is_Ident) {
+          Dafny.ISequence<Dafny.Rune> _3590___mcc_h54 = _source159.dtor_Ident_a0;
+          bool _3591_isDatatype = _3580___mcc_h51;
+          bool _3592_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3593_field = _3578___mcc_h49;
+          DAST._IExpression _3594_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3595_onExpr;
+            DCOMP._IOwnership _3596_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3597_recIdents;
+            RAST._IExpr _out1422;
+            DCOMP._IOwnership _out1423;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1424;
+            (this).GenExpr(_3594_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1422, out _out1423, out _out1424);
+            _3595_onExpr = _out1422;
+            _3596_onOwned = _out1423;
+            _3597_recIdents = _out1424;
+            if ((_3591_isDatatype) || (_3592_isConstant)) {
+              r = RAST.Expr.create_Call((_3595_onExpr).Sel(DCOMP.__default.escapeIdent(_3593_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1425;
+              DCOMP._IOwnership _out1426;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1425, out _out1426);
+              r = _out1425;
+              resultingOwnership = _out1426;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3598_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3598_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3595_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3593_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1427;
+              DCOMP._IOwnership _out1428;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3598_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1427, out _out1428);
+              r = _out1427;
+              resultingOwnership = _out1428;
+            }
+            readIdents = _3597_recIdents;
+            return ;
+          }
+        } else if (_source159.is_Companion) {
+          Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3599___mcc_h56 = _source159.dtor_Companion_a0;
+          bool _3600_isDatatype = _3580___mcc_h51;
+          bool _3601_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3602_field = _3578___mcc_h49;
+          Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3603_c = _3599___mcc_h56;
+          {
+            RAST._IExpr _3604_onExpr;
+            DCOMP._IOwnership _3605_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3606_recIdents;
+            RAST._IExpr _out1429;
+            DCOMP._IOwnership _out1430;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1431;
+            (this).GenExpr(DAST.Expression.create_Companion(_3603_c), selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1429, out _out1430, out _out1431);
+            _3604_onExpr = _out1429;
+            _3605_onOwned = _out1430;
+            _3606_recIdents = _out1431;
+            r = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat((_3604_onExpr)._ToString(DCOMP.__default.IND), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::")), DCOMP.__default.escapeIdent(_3602_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()")));
+            RAST._IExpr _out1432;
+            DCOMP._IOwnership _out1433;
+            DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1432, out _out1433);
+            r = _out1432;
+            resultingOwnership = _out1433;
+            readIdents = _3606_recIdents;
+            return ;
+          }
+        } else if (_source159.is_Tuple) {
+          Dafny.ISequence<DAST._IExpression> _3607___mcc_h58 = _source159.dtor_Tuple_a0;
+          bool _3608_isDatatype = _3580___mcc_h51;
+          bool _3609_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3610_field = _3578___mcc_h49;
+          DAST._IExpression _3611_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3612_onExpr;
+            DCOMP._IOwnership _3613_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3614_recIdents;
+            RAST._IExpr _out1434;
+            DCOMP._IOwnership _out1435;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1436;
+            (this).GenExpr(_3611_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1434, out _out1435, out _out1436);
+            _3612_onExpr = _out1434;
+            _3613_onOwned = _out1435;
+            _3614_recIdents = _out1436;
+            if ((_3608_isDatatype) || (_3609_isConstant)) {
+              r = RAST.Expr.create_Call((_3612_onExpr).Sel(DCOMP.__default.escapeIdent(_3610_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1437;
+              DCOMP._IOwnership _out1438;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1437, out _out1438);
+              r = _out1437;
+              resultingOwnership = _out1438;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3615_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3615_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3612_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3610_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1439;
+              DCOMP._IOwnership _out1440;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3615_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1439, out _out1440);
+              r = _out1439;
+              resultingOwnership = _out1440;
+            }
+            readIdents = _3614_recIdents;
+            return ;
+          }
+        } else if (_source159.is_New) {
+          Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3616___mcc_h60 = _source159.dtor_path;
+          Dafny.ISequence<DAST._IType> _3617___mcc_h61 = _source159.dtor_typeArgs;
+          Dafny.ISequence<DAST._IExpression> _3618___mcc_h62 = _source159.dtor_args;
+          bool _3619_isDatatype = _3580___mcc_h51;
+          bool _3620_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3621_field = _3578___mcc_h49;
+          DAST._IExpression _3622_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3623_onExpr;
+            DCOMP._IOwnership _3624_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3625_recIdents;
+            RAST._IExpr _out1441;
+            DCOMP._IOwnership _out1442;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1443;
+            (this).GenExpr(_3622_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1441, out _out1442, out _out1443);
+            _3623_onExpr = _out1441;
+            _3624_onOwned = _out1442;
+            _3625_recIdents = _out1443;
+            if ((_3619_isDatatype) || (_3620_isConstant)) {
+              r = RAST.Expr.create_Call((_3623_onExpr).Sel(DCOMP.__default.escapeIdent(_3621_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1444;
+              DCOMP._IOwnership _out1445;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1444, out _out1445);
+              r = _out1444;
+              resultingOwnership = _out1445;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3626_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3626_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3623_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3621_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1446;
+              DCOMP._IOwnership _out1447;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3626_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1446, out _out1447);
+              r = _out1446;
+              resultingOwnership = _out1447;
+            }
+            readIdents = _3625_recIdents;
+            return ;
+          }
+        } else if (_source159.is_NewArray) {
+          Dafny.ISequence<DAST._IExpression> _3627___mcc_h66 = _source159.dtor_dims;
+          DAST._IType _3628___mcc_h67 = _source159.dtor_typ;
+          bool _3629_isDatatype = _3580___mcc_h51;
+          bool _3630_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3631_field = _3578___mcc_h49;
+          DAST._IExpression _3632_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3633_onExpr;
+            DCOMP._IOwnership _3634_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3635_recIdents;
+            RAST._IExpr _out1448;
+            DCOMP._IOwnership _out1449;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1450;
+            (this).GenExpr(_3632_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1448, out _out1449, out _out1450);
+            _3633_onExpr = _out1448;
+            _3634_onOwned = _out1449;
+            _3635_recIdents = _out1450;
+            if ((_3629_isDatatype) || (_3630_isConstant)) {
+              r = RAST.Expr.create_Call((_3633_onExpr).Sel(DCOMP.__default.escapeIdent(_3631_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1451;
+              DCOMP._IOwnership _out1452;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1451, out _out1452);
+              r = _out1451;
+              resultingOwnership = _out1452;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3636_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3636_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3633_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3631_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1453;
+              DCOMP._IOwnership _out1454;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3636_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1453, out _out1454);
+              r = _out1453;
+              resultingOwnership = _out1454;
+            }
+            readIdents = _3635_recIdents;
+            return ;
+          }
+        } else if (_source159.is_DatatypeValue) {
+          Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3637___mcc_h70 = _source159.dtor_path;
+          Dafny.ISequence<DAST._IType> _3638___mcc_h71 = _source159.dtor_typeArgs;
+          Dafny.ISequence<Dafny.Rune> _3639___mcc_h72 = _source159.dtor_variant;
+          bool _3640___mcc_h73 = _source159.dtor_isCo;
+          Dafny.ISequence<_System._ITuple2<Dafny.ISequence<Dafny.Rune>, DAST._IExpression>> _3641___mcc_h74 = _source159.dtor_contents;
+          bool _3642_isDatatype = _3580___mcc_h51;
+          bool _3643_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3644_field = _3578___mcc_h49;
+          DAST._IExpression _3645_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3646_onExpr;
+            DCOMP._IOwnership _3647_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3648_recIdents;
+            RAST._IExpr _out1455;
+            DCOMP._IOwnership _out1456;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1457;
+            (this).GenExpr(_3645_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1455, out _out1456, out _out1457);
+            _3646_onExpr = _out1455;
+            _3647_onOwned = _out1456;
+            _3648_recIdents = _out1457;
+            if ((_3642_isDatatype) || (_3643_isConstant)) {
+              r = RAST.Expr.create_Call((_3646_onExpr).Sel(DCOMP.__default.escapeIdent(_3644_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1458;
+              DCOMP._IOwnership _out1459;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1458, out _out1459);
+              r = _out1458;
+              resultingOwnership = _out1459;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3649_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3649_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3646_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3644_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1460;
+              DCOMP._IOwnership _out1461;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3649_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1460, out _out1461);
+              r = _out1460;
+              resultingOwnership = _out1461;
+            }
+            readIdents = _3648_recIdents;
+            return ;
+          }
+        } else if (_source159.is_Convert) {
+          DAST._IExpression _3650___mcc_h80 = _source159.dtor_value;
+          DAST._IType _3651___mcc_h81 = _source159.dtor_from;
+          DAST._IType _3652___mcc_h82 = _source159.dtor_typ;
+          bool _3653_isDatatype = _3580___mcc_h51;
+          bool _3654_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3655_field = _3578___mcc_h49;
+          DAST._IExpression _3656_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3657_onExpr;
+            DCOMP._IOwnership _3658_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3659_recIdents;
+            RAST._IExpr _out1462;
+            DCOMP._IOwnership _out1463;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1464;
+            (this).GenExpr(_3656_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1462, out _out1463, out _out1464);
+            _3657_onExpr = _out1462;
+            _3658_onOwned = _out1463;
+            _3659_recIdents = _out1464;
+            if ((_3653_isDatatype) || (_3654_isConstant)) {
+              r = RAST.Expr.create_Call((_3657_onExpr).Sel(DCOMP.__default.escapeIdent(_3655_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1465;
+              DCOMP._IOwnership _out1466;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1465, out _out1466);
+              r = _out1465;
+              resultingOwnership = _out1466;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3660_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3660_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3657_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3655_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1467;
+              DCOMP._IOwnership _out1468;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3660_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1467, out _out1468);
+              r = _out1467;
+              resultingOwnership = _out1468;
+            }
+            readIdents = _3659_recIdents;
+            return ;
+          }
+        } else if (_source159.is_SeqConstruct) {
+          DAST._IExpression _3661___mcc_h86 = _source159.dtor_length;
+          DAST._IExpression _3662___mcc_h87 = _source159.dtor_elem;
+          bool _3663_isDatatype = _3580___mcc_h51;
+          bool _3664_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3665_field = _3578___mcc_h49;
+          DAST._IExpression _3666_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3667_onExpr;
+            DCOMP._IOwnership _3668_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3669_recIdents;
+            RAST._IExpr _out1469;
+            DCOMP._IOwnership _out1470;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1471;
+            (this).GenExpr(_3666_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1469, out _out1470, out _out1471);
+            _3667_onExpr = _out1469;
+            _3668_onOwned = _out1470;
+            _3669_recIdents = _out1471;
+            if ((_3663_isDatatype) || (_3664_isConstant)) {
+              r = RAST.Expr.create_Call((_3667_onExpr).Sel(DCOMP.__default.escapeIdent(_3665_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1472;
+              DCOMP._IOwnership _out1473;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1472, out _out1473);
+              r = _out1472;
+              resultingOwnership = _out1473;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3670_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3670_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3667_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3665_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1474;
+              DCOMP._IOwnership _out1475;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3670_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1474, out _out1475);
+              r = _out1474;
+              resultingOwnership = _out1475;
+            }
+            readIdents = _3669_recIdents;
+            return ;
+          }
+        } else if (_source159.is_SeqValue) {
+          Dafny.ISequence<DAST._IExpression> _3671___mcc_h90 = _source159.dtor_elements;
+          DAST._IType _3672___mcc_h91 = _source159.dtor_typ;
+          bool _3673_isDatatype = _3580___mcc_h51;
+          bool _3674_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3675_field = _3578___mcc_h49;
+          DAST._IExpression _3676_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3677_onExpr;
+            DCOMP._IOwnership _3678_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3679_recIdents;
+            RAST._IExpr _out1476;
+            DCOMP._IOwnership _out1477;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1478;
+            (this).GenExpr(_3676_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1476, out _out1477, out _out1478);
+            _3677_onExpr = _out1476;
+            _3678_onOwned = _out1477;
+            _3679_recIdents = _out1478;
+            if ((_3673_isDatatype) || (_3674_isConstant)) {
+              r = RAST.Expr.create_Call((_3677_onExpr).Sel(DCOMP.__default.escapeIdent(_3675_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1479;
+              DCOMP._IOwnership _out1480;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1479, out _out1480);
+              r = _out1479;
+              resultingOwnership = _out1480;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3680_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3680_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3677_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3675_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1481;
+              DCOMP._IOwnership _out1482;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3680_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1481, out _out1482);
+              r = _out1481;
+              resultingOwnership = _out1482;
+            }
+            readIdents = _3679_recIdents;
+            return ;
+          }
+        } else if (_source159.is_SetValue) {
+          Dafny.ISequence<DAST._IExpression> _3681___mcc_h94 = _source159.dtor_elements;
+          bool _3682_isDatatype = _3580___mcc_h51;
+          bool _3683_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3684_field = _3578___mcc_h49;
+          DAST._IExpression _3685_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3686_onExpr;
+            DCOMP._IOwnership _3687_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3688_recIdents;
+            RAST._IExpr _out1483;
+            DCOMP._IOwnership _out1484;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1485;
+            (this).GenExpr(_3685_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1483, out _out1484, out _out1485);
+            _3686_onExpr = _out1483;
+            _3687_onOwned = _out1484;
+            _3688_recIdents = _out1485;
+            if ((_3682_isDatatype) || (_3683_isConstant)) {
+              r = RAST.Expr.create_Call((_3686_onExpr).Sel(DCOMP.__default.escapeIdent(_3684_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1486;
+              DCOMP._IOwnership _out1487;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1486, out _out1487);
+              r = _out1486;
+              resultingOwnership = _out1487;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3689_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3689_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3686_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3684_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1488;
+              DCOMP._IOwnership _out1489;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3689_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1488, out _out1489);
+              r = _out1488;
+              resultingOwnership = _out1489;
+            }
+            readIdents = _3688_recIdents;
+            return ;
+          }
+        } else if (_source159.is_MultisetValue) {
+          Dafny.ISequence<DAST._IExpression> _3690___mcc_h96 = _source159.dtor_elements;
+          bool _3691_isDatatype = _3580___mcc_h51;
+          bool _3692_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3693_field = _3578___mcc_h49;
+          DAST._IExpression _3694_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3695_onExpr;
+            DCOMP._IOwnership _3696_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3697_recIdents;
+            RAST._IExpr _out1490;
+            DCOMP._IOwnership _out1491;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1492;
+            (this).GenExpr(_3694_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1490, out _out1491, out _out1492);
+            _3695_onExpr = _out1490;
+            _3696_onOwned = _out1491;
+            _3697_recIdents = _out1492;
+            if ((_3691_isDatatype) || (_3692_isConstant)) {
+              r = RAST.Expr.create_Call((_3695_onExpr).Sel(DCOMP.__default.escapeIdent(_3693_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1493;
+              DCOMP._IOwnership _out1494;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1493, out _out1494);
+              r = _out1493;
+              resultingOwnership = _out1494;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3698_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3698_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3695_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3693_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1495;
+              DCOMP._IOwnership _out1496;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3698_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1495, out _out1496);
+              r = _out1495;
+              resultingOwnership = _out1496;
+            }
+            readIdents = _3697_recIdents;
+            return ;
+          }
+        } else if (_source159.is_MapValue) {
+          Dafny.ISequence<_System._ITuple2<DAST._IExpression, DAST._IExpression>> _3699___mcc_h98 = _source159.dtor_mapElems;
+          bool _3700_isDatatype = _3580___mcc_h51;
+          bool _3701_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3702_field = _3578___mcc_h49;
+          DAST._IExpression _3703_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3704_onExpr;
+            DCOMP._IOwnership _3705_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3706_recIdents;
+            RAST._IExpr _out1497;
+            DCOMP._IOwnership _out1498;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1499;
+            (this).GenExpr(_3703_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1497, out _out1498, out _out1499);
+            _3704_onExpr = _out1497;
+            _3705_onOwned = _out1498;
+            _3706_recIdents = _out1499;
+            if ((_3700_isDatatype) || (_3701_isConstant)) {
+              r = RAST.Expr.create_Call((_3704_onExpr).Sel(DCOMP.__default.escapeIdent(_3702_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1500;
+              DCOMP._IOwnership _out1501;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1500, out _out1501);
+              r = _out1500;
+              resultingOwnership = _out1501;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3707_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3707_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3704_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3702_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1502;
+              DCOMP._IOwnership _out1503;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3707_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1502, out _out1503);
+              r = _out1502;
+              resultingOwnership = _out1503;
+            }
+            readIdents = _3706_recIdents;
+            return ;
+          }
+        } else if (_source159.is_MapBuilder) {
+          DAST._IType _3708___mcc_h100 = _source159.dtor_keyType;
+          DAST._IType _3709___mcc_h101 = _source159.dtor_valueType;
+          bool _3710_isDatatype = _3580___mcc_h51;
+          bool _3711_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3712_field = _3578___mcc_h49;
+          DAST._IExpression _3713_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3714_onExpr;
+            DCOMP._IOwnership _3715_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3716_recIdents;
+            RAST._IExpr _out1504;
+            DCOMP._IOwnership _out1505;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1506;
+            (this).GenExpr(_3713_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1504, out _out1505, out _out1506);
+            _3714_onExpr = _out1504;
+            _3715_onOwned = _out1505;
+            _3716_recIdents = _out1506;
+            if ((_3710_isDatatype) || (_3711_isConstant)) {
+              r = RAST.Expr.create_Call((_3714_onExpr).Sel(DCOMP.__default.escapeIdent(_3712_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1507;
+              DCOMP._IOwnership _out1508;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1507, out _out1508);
+              r = _out1507;
+              resultingOwnership = _out1508;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3717_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3717_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3714_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3712_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1509;
+              DCOMP._IOwnership _out1510;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3717_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1509, out _out1510);
+              r = _out1509;
+              resultingOwnership = _out1510;
+            }
+            readIdents = _3716_recIdents;
+            return ;
+          }
+        } else if (_source159.is_SeqUpdate) {
+          DAST._IExpression _3718___mcc_h104 = _source159.dtor_expr;
+          DAST._IExpression _3719___mcc_h105 = _source159.dtor_indexExpr;
+          DAST._IExpression _3720___mcc_h106 = _source159.dtor_value;
+          bool _3721_isDatatype = _3580___mcc_h51;
+          bool _3722_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3723_field = _3578___mcc_h49;
+          DAST._IExpression _3724_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3725_onExpr;
+            DCOMP._IOwnership _3726_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3727_recIdents;
+            RAST._IExpr _out1511;
+            DCOMP._IOwnership _out1512;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1513;
+            (this).GenExpr(_3724_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1511, out _out1512, out _out1513);
+            _3725_onExpr = _out1511;
+            _3726_onOwned = _out1512;
+            _3727_recIdents = _out1513;
+            if ((_3721_isDatatype) || (_3722_isConstant)) {
+              r = RAST.Expr.create_Call((_3725_onExpr).Sel(DCOMP.__default.escapeIdent(_3723_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1514;
+              DCOMP._IOwnership _out1515;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1514, out _out1515);
+              r = _out1514;
+              resultingOwnership = _out1515;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3728_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3728_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3725_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3723_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1516;
+              DCOMP._IOwnership _out1517;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3728_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1516, out _out1517);
+              r = _out1516;
+              resultingOwnership = _out1517;
+            }
+            readIdents = _3727_recIdents;
+            return ;
+          }
+        } else if (_source159.is_MapUpdate) {
+          DAST._IExpression _3729___mcc_h110 = _source159.dtor_expr;
+          DAST._IExpression _3730___mcc_h111 = _source159.dtor_indexExpr;
+          DAST._IExpression _3731___mcc_h112 = _source159.dtor_value;
+          bool _3732_isDatatype = _3580___mcc_h51;
+          bool _3733_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3734_field = _3578___mcc_h49;
+          DAST._IExpression _3735_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3736_onExpr;
+            DCOMP._IOwnership _3737_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3738_recIdents;
+            RAST._IExpr _out1518;
+            DCOMP._IOwnership _out1519;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1520;
+            (this).GenExpr(_3735_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1518, out _out1519, out _out1520);
+            _3736_onExpr = _out1518;
+            _3737_onOwned = _out1519;
+            _3738_recIdents = _out1520;
+            if ((_3732_isDatatype) || (_3733_isConstant)) {
+              r = RAST.Expr.create_Call((_3736_onExpr).Sel(DCOMP.__default.escapeIdent(_3734_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1521;
+              DCOMP._IOwnership _out1522;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1521, out _out1522);
+              r = _out1521;
+              resultingOwnership = _out1522;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3739_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3739_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3736_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3734_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1523;
+              DCOMP._IOwnership _out1524;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3739_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1523, out _out1524);
+              r = _out1523;
+              resultingOwnership = _out1524;
+            }
+            readIdents = _3738_recIdents;
+            return ;
+          }
+        } else if (_source159.is_SetBuilder) {
+          DAST._IType _3740___mcc_h116 = _source159.dtor_elemType;
+          bool _3741_isDatatype = _3580___mcc_h51;
+          bool _3742_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3743_field = _3578___mcc_h49;
+          DAST._IExpression _3744_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3745_onExpr;
+            DCOMP._IOwnership _3746_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3747_recIdents;
+            RAST._IExpr _out1525;
+            DCOMP._IOwnership _out1526;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1527;
+            (this).GenExpr(_3744_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1525, out _out1526, out _out1527);
+            _3745_onExpr = _out1525;
+            _3746_onOwned = _out1526;
+            _3747_recIdents = _out1527;
+            if ((_3741_isDatatype) || (_3742_isConstant)) {
+              r = RAST.Expr.create_Call((_3745_onExpr).Sel(DCOMP.__default.escapeIdent(_3743_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1528;
+              DCOMP._IOwnership _out1529;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1528, out _out1529);
+              r = _out1528;
+              resultingOwnership = _out1529;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3748_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3748_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3745_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3743_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1530;
+              DCOMP._IOwnership _out1531;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3748_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1530, out _out1531);
+              r = _out1530;
+              resultingOwnership = _out1531;
+            }
+            readIdents = _3747_recIdents;
+            return ;
+          }
+        } else if (_source159.is_ToMultiset) {
+          DAST._IExpression _3749___mcc_h118 = _source159.dtor_ToMultiset_a0;
+          bool _3750_isDatatype = _3580___mcc_h51;
+          bool _3751_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3752_field = _3578___mcc_h49;
+          DAST._IExpression _3753_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3754_onExpr;
+            DCOMP._IOwnership _3755_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3756_recIdents;
+            RAST._IExpr _out1532;
+            DCOMP._IOwnership _out1533;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1534;
+            (this).GenExpr(_3753_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1532, out _out1533, out _out1534);
+            _3754_onExpr = _out1532;
+            _3755_onOwned = _out1533;
+            _3756_recIdents = _out1534;
+            if ((_3750_isDatatype) || (_3751_isConstant)) {
+              r = RAST.Expr.create_Call((_3754_onExpr).Sel(DCOMP.__default.escapeIdent(_3752_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1535;
+              DCOMP._IOwnership _out1536;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1535, out _out1536);
+              r = _out1535;
+              resultingOwnership = _out1536;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3757_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3757_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3754_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3752_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1537;
+              DCOMP._IOwnership _out1538;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3757_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1537, out _out1538);
+              r = _out1537;
+              resultingOwnership = _out1538;
+            }
+            readIdents = _3756_recIdents;
+            return ;
+          }
+        } else if (_source159.is_This) {
+          bool _3758_isDatatype = _3580___mcc_h51;
+          bool _3759_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3760_field = _3578___mcc_h49;
+          DAST._IExpression _3761_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3762_onExpr;
+            DCOMP._IOwnership _3763_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3764_recIdents;
+            RAST._IExpr _out1539;
+            DCOMP._IOwnership _out1540;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1541;
+            (this).GenExpr(_3761_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1539, out _out1540, out _out1541);
+            _3762_onExpr = _out1539;
+            _3763_onOwned = _out1540;
+            _3764_recIdents = _out1541;
+            if ((_3758_isDatatype) || (_3759_isConstant)) {
+              r = RAST.Expr.create_Call((_3762_onExpr).Sel(DCOMP.__default.escapeIdent(_3760_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1542;
+              DCOMP._IOwnership _out1543;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1542, out _out1543);
+              r = _out1542;
+              resultingOwnership = _out1543;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3765_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3765_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3762_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3760_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1544;
+              DCOMP._IOwnership _out1545;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3765_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1544, out _out1545);
+              r = _out1544;
+              resultingOwnership = _out1545;
+            }
+            readIdents = _3764_recIdents;
+            return ;
+          }
+        } else if (_source159.is_Ite) {
+          DAST._IExpression _3766___mcc_h120 = _source159.dtor_cond;
+          DAST._IExpression _3767___mcc_h121 = _source159.dtor_thn;
+          DAST._IExpression _3768___mcc_h122 = _source159.dtor_els;
+          bool _3769_isDatatype = _3580___mcc_h51;
+          bool _3770_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3771_field = _3578___mcc_h49;
+          DAST._IExpression _3772_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3773_onExpr;
+            DCOMP._IOwnership _3774_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3775_recIdents;
+            RAST._IExpr _out1546;
+            DCOMP._IOwnership _out1547;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1548;
+            (this).GenExpr(_3772_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1546, out _out1547, out _out1548);
+            _3773_onExpr = _out1546;
+            _3774_onOwned = _out1547;
+            _3775_recIdents = _out1548;
+            if ((_3769_isDatatype) || (_3770_isConstant)) {
+              r = RAST.Expr.create_Call((_3773_onExpr).Sel(DCOMP.__default.escapeIdent(_3771_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1549;
+              DCOMP._IOwnership _out1550;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1549, out _out1550);
+              r = _out1549;
+              resultingOwnership = _out1550;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3776_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3776_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3773_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3771_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1551;
+              DCOMP._IOwnership _out1552;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3776_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1551, out _out1552);
+              r = _out1551;
+              resultingOwnership = _out1552;
+            }
+            readIdents = _3775_recIdents;
+            return ;
+          }
+        } else if (_source159.is_UnOp) {
+          DAST._IUnaryOp _3777___mcc_h126 = _source159.dtor_unOp;
+          DAST._IExpression _3778___mcc_h127 = _source159.dtor_expr;
+          DAST.Format._IUnaryOpFormat _3779___mcc_h128 = _source159.dtor_format1;
+          bool _3780_isDatatype = _3580___mcc_h51;
+          bool _3781_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3782_field = _3578___mcc_h49;
+          DAST._IExpression _3783_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3784_onExpr;
+            DCOMP._IOwnership _3785_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3786_recIdents;
+            RAST._IExpr _out1553;
+            DCOMP._IOwnership _out1554;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1555;
+            (this).GenExpr(_3783_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1553, out _out1554, out _out1555);
+            _3784_onExpr = _out1553;
+            _3785_onOwned = _out1554;
+            _3786_recIdents = _out1555;
+            if ((_3780_isDatatype) || (_3781_isConstant)) {
+              r = RAST.Expr.create_Call((_3784_onExpr).Sel(DCOMP.__default.escapeIdent(_3782_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1556;
+              DCOMP._IOwnership _out1557;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1556, out _out1557);
+              r = _out1556;
+              resultingOwnership = _out1557;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3787_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3787_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3784_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3782_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1558;
+              DCOMP._IOwnership _out1559;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3787_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1558, out _out1559);
+              r = _out1558;
+              resultingOwnership = _out1559;
+            }
+            readIdents = _3786_recIdents;
+            return ;
+          }
+        } else if (_source159.is_BinOp) {
+          DAST._IBinOp _3788___mcc_h132 = _source159.dtor_op;
+          DAST._IExpression _3789___mcc_h133 = _source159.dtor_left;
+          DAST._IExpression _3790___mcc_h134 = _source159.dtor_right;
+          DAST.Format._IBinaryOpFormat _3791___mcc_h135 = _source159.dtor_format2;
+          bool _3792_isDatatype = _3580___mcc_h51;
+          bool _3793_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3794_field = _3578___mcc_h49;
+          DAST._IExpression _3795_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3796_onExpr;
+            DCOMP._IOwnership _3797_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3798_recIdents;
+            RAST._IExpr _out1560;
+            DCOMP._IOwnership _out1561;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1562;
+            (this).GenExpr(_3795_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1560, out _out1561, out _out1562);
+            _3796_onExpr = _out1560;
+            _3797_onOwned = _out1561;
+            _3798_recIdents = _out1562;
+            if ((_3792_isDatatype) || (_3793_isConstant)) {
+              r = RAST.Expr.create_Call((_3796_onExpr).Sel(DCOMP.__default.escapeIdent(_3794_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1563;
+              DCOMP._IOwnership _out1564;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1563, out _out1564);
+              r = _out1563;
+              resultingOwnership = _out1564;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3799_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3799_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3796_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3794_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1565;
+              DCOMP._IOwnership _out1566;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3799_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1565, out _out1566);
+              r = _out1565;
+              resultingOwnership = _out1566;
+            }
+            readIdents = _3798_recIdents;
+            return ;
+          }
+        } else if (_source159.is_ArrayLen) {
+          DAST._IExpression _3800___mcc_h140 = _source159.dtor_expr;
+          BigInteger _3801___mcc_h141 = _source159.dtor_dim;
+          bool _3802_isDatatype = _3580___mcc_h51;
+          bool _3803_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3804_field = _3578___mcc_h49;
+          DAST._IExpression _3805_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3806_onExpr;
+            DCOMP._IOwnership _3807_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3808_recIdents;
+            RAST._IExpr _out1567;
+            DCOMP._IOwnership _out1568;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1569;
+            (this).GenExpr(_3805_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1567, out _out1568, out _out1569);
+            _3806_onExpr = _out1567;
+            _3807_onOwned = _out1568;
+            _3808_recIdents = _out1569;
+            if ((_3802_isDatatype) || (_3803_isConstant)) {
+              r = RAST.Expr.create_Call((_3806_onExpr).Sel(DCOMP.__default.escapeIdent(_3804_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1570;
+              DCOMP._IOwnership _out1571;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1570, out _out1571);
+              r = _out1570;
+              resultingOwnership = _out1571;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3809_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3809_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3806_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3804_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1572;
+              DCOMP._IOwnership _out1573;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3809_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1572, out _out1573);
+              r = _out1572;
+              resultingOwnership = _out1573;
+            }
+            readIdents = _3808_recIdents;
+            return ;
+          }
+        } else if (_source159.is_MapKeys) {
+          DAST._IExpression _3810___mcc_h144 = _source159.dtor_expr;
+          bool _3811_isDatatype = _3580___mcc_h51;
+          bool _3812_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3813_field = _3578___mcc_h49;
+          DAST._IExpression _3814_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3815_onExpr;
+            DCOMP._IOwnership _3816_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3817_recIdents;
+            RAST._IExpr _out1574;
+            DCOMP._IOwnership _out1575;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1576;
+            (this).GenExpr(_3814_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1574, out _out1575, out _out1576);
+            _3815_onExpr = _out1574;
+            _3816_onOwned = _out1575;
+            _3817_recIdents = _out1576;
+            if ((_3811_isDatatype) || (_3812_isConstant)) {
+              r = RAST.Expr.create_Call((_3815_onExpr).Sel(DCOMP.__default.escapeIdent(_3813_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1577;
+              DCOMP._IOwnership _out1578;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1577, out _out1578);
+              r = _out1577;
+              resultingOwnership = _out1578;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3818_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3818_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3815_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3813_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1579;
+              DCOMP._IOwnership _out1580;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3818_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1579, out _out1580);
+              r = _out1579;
+              resultingOwnership = _out1580;
+            }
+            readIdents = _3817_recIdents;
+            return ;
+          }
+        } else if (_source159.is_MapValues) {
+          DAST._IExpression _3819___mcc_h146 = _source159.dtor_expr;
+          bool _3820_isDatatype = _3580___mcc_h51;
+          bool _3821_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3822_field = _3578___mcc_h49;
+          DAST._IExpression _3823_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3824_onExpr;
+            DCOMP._IOwnership _3825_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3826_recIdents;
+            RAST._IExpr _out1581;
+            DCOMP._IOwnership _out1582;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1583;
+            (this).GenExpr(_3823_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1581, out _out1582, out _out1583);
+            _3824_onExpr = _out1581;
+            _3825_onOwned = _out1582;
+            _3826_recIdents = _out1583;
+            if ((_3820_isDatatype) || (_3821_isConstant)) {
+              r = RAST.Expr.create_Call((_3824_onExpr).Sel(DCOMP.__default.escapeIdent(_3822_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1584;
+              DCOMP._IOwnership _out1585;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1584, out _out1585);
+              r = _out1584;
+              resultingOwnership = _out1585;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3827_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3827_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3824_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3822_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1586;
+              DCOMP._IOwnership _out1587;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3827_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1586, out _out1587);
+              r = _out1586;
+              resultingOwnership = _out1587;
+            }
+            readIdents = _3826_recIdents;
+            return ;
+          }
+        } else if (_source159.is_Select) {
+          DAST._IExpression _3828___mcc_h148 = _source159.dtor_expr;
+          Dafny.ISequence<Dafny.Rune> _3829___mcc_h149 = _source159.dtor_field;
+          bool _3830___mcc_h150 = _source159.dtor_isConstant;
+          bool _3831___mcc_h151 = _source159.dtor_onDatatype;
+          bool _3832_isDatatype = _3580___mcc_h51;
+          bool _3833_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3834_field = _3578___mcc_h49;
+          DAST._IExpression _3835_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3836_onExpr;
+            DCOMP._IOwnership _3837_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3838_recIdents;
+            RAST._IExpr _out1588;
+            DCOMP._IOwnership _out1589;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1590;
+            (this).GenExpr(_3835_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1588, out _out1589, out _out1590);
+            _3836_onExpr = _out1588;
+            _3837_onOwned = _out1589;
+            _3838_recIdents = _out1590;
+            if ((_3832_isDatatype) || (_3833_isConstant)) {
+              r = RAST.Expr.create_Call((_3836_onExpr).Sel(DCOMP.__default.escapeIdent(_3834_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1591;
+              DCOMP._IOwnership _out1592;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1591, out _out1592);
+              r = _out1591;
+              resultingOwnership = _out1592;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3839_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3839_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3836_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3834_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1593;
+              DCOMP._IOwnership _out1594;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3839_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1593, out _out1594);
+              r = _out1593;
+              resultingOwnership = _out1594;
+            }
+            readIdents = _3838_recIdents;
+            return ;
+          }
+        } else if (_source159.is_SelectFn) {
+          DAST._IExpression _3840___mcc_h156 = _source159.dtor_expr;
+          Dafny.ISequence<Dafny.Rune> _3841___mcc_h157 = _source159.dtor_field;
+          bool _3842___mcc_h158 = _source159.dtor_onDatatype;
+          bool _3843___mcc_h159 = _source159.dtor_isStatic;
+          BigInteger _3844___mcc_h160 = _source159.dtor_arity;
+          bool _3845_isDatatype = _3580___mcc_h51;
+          bool _3846_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3847_field = _3578___mcc_h49;
+          DAST._IExpression _3848_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3849_onExpr;
+            DCOMP._IOwnership _3850_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3851_recIdents;
+            RAST._IExpr _out1595;
+            DCOMP._IOwnership _out1596;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1597;
+            (this).GenExpr(_3848_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1595, out _out1596, out _out1597);
+            _3849_onExpr = _out1595;
+            _3850_onOwned = _out1596;
+            _3851_recIdents = _out1597;
+            if ((_3845_isDatatype) || (_3846_isConstant)) {
+              r = RAST.Expr.create_Call((_3849_onExpr).Sel(DCOMP.__default.escapeIdent(_3847_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1598;
+              DCOMP._IOwnership _out1599;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1598, out _out1599);
+              r = _out1598;
+              resultingOwnership = _out1599;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3852_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3852_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3849_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3847_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1600;
+              DCOMP._IOwnership _out1601;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3852_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1600, out _out1601);
+              r = _out1600;
+              resultingOwnership = _out1601;
+            }
+            readIdents = _3851_recIdents;
+            return ;
+          }
+        } else if (_source159.is_Index) {
+          DAST._IExpression _3853___mcc_h166 = _source159.dtor_expr;
+          DAST._ICollKind _3854___mcc_h167 = _source159.dtor_collKind;
+          Dafny.ISequence<DAST._IExpression> _3855___mcc_h168 = _source159.dtor_indices;
+          bool _3856_isDatatype = _3580___mcc_h51;
+          bool _3857_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3858_field = _3578___mcc_h49;
+          DAST._IExpression _3859_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3860_onExpr;
+            DCOMP._IOwnership _3861_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3862_recIdents;
+            RAST._IExpr _out1602;
+            DCOMP._IOwnership _out1603;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1604;
+            (this).GenExpr(_3859_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1602, out _out1603, out _out1604);
+            _3860_onExpr = _out1602;
+            _3861_onOwned = _out1603;
+            _3862_recIdents = _out1604;
+            if ((_3856_isDatatype) || (_3857_isConstant)) {
+              r = RAST.Expr.create_Call((_3860_onExpr).Sel(DCOMP.__default.escapeIdent(_3858_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1605;
+              DCOMP._IOwnership _out1606;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1605, out _out1606);
+              r = _out1605;
+              resultingOwnership = _out1606;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3863_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3863_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3860_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3858_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1607;
+              DCOMP._IOwnership _out1608;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3863_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1607, out _out1608);
+              r = _out1607;
+              resultingOwnership = _out1608;
+            }
+            readIdents = _3862_recIdents;
+            return ;
+          }
+        } else if (_source159.is_IndexRange) {
+          DAST._IExpression _3864___mcc_h172 = _source159.dtor_expr;
+          bool _3865___mcc_h173 = _source159.dtor_isArray;
+          Std.Wrappers._IOption<DAST._IExpression> _3866___mcc_h174 = _source159.dtor_low;
+          Std.Wrappers._IOption<DAST._IExpression> _3867___mcc_h175 = _source159.dtor_high;
+          bool _3868_isDatatype = _3580___mcc_h51;
+          bool _3869_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3870_field = _3578___mcc_h49;
+          DAST._IExpression _3871_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3872_onExpr;
+            DCOMP._IOwnership _3873_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3874_recIdents;
+            RAST._IExpr _out1609;
+            DCOMP._IOwnership _out1610;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1611;
+            (this).GenExpr(_3871_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1609, out _out1610, out _out1611);
+            _3872_onExpr = _out1609;
+            _3873_onOwned = _out1610;
+            _3874_recIdents = _out1611;
+            if ((_3868_isDatatype) || (_3869_isConstant)) {
+              r = RAST.Expr.create_Call((_3872_onExpr).Sel(DCOMP.__default.escapeIdent(_3870_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1612;
+              DCOMP._IOwnership _out1613;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1612, out _out1613);
+              r = _out1612;
+              resultingOwnership = _out1613;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3875_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3875_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3872_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3870_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1614;
+              DCOMP._IOwnership _out1615;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3875_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1614, out _out1615);
+              r = _out1614;
+              resultingOwnership = _out1615;
+            }
+            readIdents = _3874_recIdents;
+            return ;
+          }
+        } else if (_source159.is_TupleSelect) {
+          DAST._IExpression _3876___mcc_h180 = _source159.dtor_expr;
+          BigInteger _3877___mcc_h181 = _source159.dtor_index;
+          bool _3878_isDatatype = _3580___mcc_h51;
+          bool _3879_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3880_field = _3578___mcc_h49;
+          DAST._IExpression _3881_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3882_onExpr;
+            DCOMP._IOwnership _3883_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3884_recIdents;
+            RAST._IExpr _out1616;
+            DCOMP._IOwnership _out1617;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1618;
+            (this).GenExpr(_3881_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1616, out _out1617, out _out1618);
+            _3882_onExpr = _out1616;
+            _3883_onOwned = _out1617;
+            _3884_recIdents = _out1618;
+            if ((_3878_isDatatype) || (_3879_isConstant)) {
+              r = RAST.Expr.create_Call((_3882_onExpr).Sel(DCOMP.__default.escapeIdent(_3880_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1619;
+              DCOMP._IOwnership _out1620;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1619, out _out1620);
+              r = _out1619;
+              resultingOwnership = _out1620;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3885_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3885_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3882_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3880_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1621;
+              DCOMP._IOwnership _out1622;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3885_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1621, out _out1622);
+              r = _out1621;
+              resultingOwnership = _out1622;
+            }
+            readIdents = _3884_recIdents;
+            return ;
+          }
+        } else if (_source159.is_Call) {
+          DAST._IExpression _3886___mcc_h184 = _source159.dtor_on;
+          DAST._ICallName _3887___mcc_h185 = _source159.dtor_callName;
+          Dafny.ISequence<DAST._IType> _3888___mcc_h186 = _source159.dtor_typeArgs;
+          Dafny.ISequence<DAST._IExpression> _3889___mcc_h187 = _source159.dtor_args;
+          bool _3890_isDatatype = _3580___mcc_h51;
+          bool _3891_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3892_field = _3578___mcc_h49;
+          DAST._IExpression _3893_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3894_onExpr;
+            DCOMP._IOwnership _3895_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3896_recIdents;
+            RAST._IExpr _out1623;
+            DCOMP._IOwnership _out1624;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1625;
+            (this).GenExpr(_3893_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1623, out _out1624, out _out1625);
+            _3894_onExpr = _out1623;
+            _3895_onOwned = _out1624;
+            _3896_recIdents = _out1625;
+            if ((_3890_isDatatype) || (_3891_isConstant)) {
+              r = RAST.Expr.create_Call((_3894_onExpr).Sel(DCOMP.__default.escapeIdent(_3892_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1626;
+              DCOMP._IOwnership _out1627;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1626, out _out1627);
+              r = _out1626;
+              resultingOwnership = _out1627;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3897_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3897_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3894_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3892_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1628;
+              DCOMP._IOwnership _out1629;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3897_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1628, out _out1629);
+              r = _out1628;
+              resultingOwnership = _out1629;
+            }
+            readIdents = _3896_recIdents;
+            return ;
+          }
+        } else if (_source159.is_Lambda) {
+          Dafny.ISequence<DAST._IFormal> _3898___mcc_h192 = _source159.dtor_params;
+          DAST._IType _3899___mcc_h193 = _source159.dtor_retType;
+          Dafny.ISequence<DAST._IStatement> _3900___mcc_h194 = _source159.dtor_body;
+          bool _3901_isDatatype = _3580___mcc_h51;
+          bool _3902_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3903_field = _3578___mcc_h49;
+          DAST._IExpression _3904_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3905_onExpr;
+            DCOMP._IOwnership _3906_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3907_recIdents;
+            RAST._IExpr _out1630;
+            DCOMP._IOwnership _out1631;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1632;
+            (this).GenExpr(_3904_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1630, out _out1631, out _out1632);
+            _3905_onExpr = _out1630;
+            _3906_onOwned = _out1631;
+            _3907_recIdents = _out1632;
+            if ((_3901_isDatatype) || (_3902_isConstant)) {
+              r = RAST.Expr.create_Call((_3905_onExpr).Sel(DCOMP.__default.escapeIdent(_3903_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1633;
+              DCOMP._IOwnership _out1634;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1633, out _out1634);
+              r = _out1633;
+              resultingOwnership = _out1634;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3908_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3908_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3905_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3903_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1635;
+              DCOMP._IOwnership _out1636;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3908_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1635, out _out1636);
+              r = _out1635;
+              resultingOwnership = _out1636;
+            }
+            readIdents = _3907_recIdents;
+            return ;
+          }
+        } else if (_source159.is_BetaRedex) {
+          Dafny.ISequence<_System._ITuple2<DAST._IFormal, DAST._IExpression>> _3909___mcc_h198 = _source159.dtor_values;
+          DAST._IType _3910___mcc_h199 = _source159.dtor_retType;
+          DAST._IExpression _3911___mcc_h200 = _source159.dtor_expr;
+          bool _3912_isDatatype = _3580___mcc_h51;
+          bool _3913_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3914_field = _3578___mcc_h49;
+          DAST._IExpression _3915_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3916_onExpr;
+            DCOMP._IOwnership _3917_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3918_recIdents;
+            RAST._IExpr _out1637;
+            DCOMP._IOwnership _out1638;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1639;
+            (this).GenExpr(_3915_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1637, out _out1638, out _out1639);
+            _3916_onExpr = _out1637;
+            _3917_onOwned = _out1638;
+            _3918_recIdents = _out1639;
+            if ((_3912_isDatatype) || (_3913_isConstant)) {
+              r = RAST.Expr.create_Call((_3916_onExpr).Sel(DCOMP.__default.escapeIdent(_3914_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1640;
+              DCOMP._IOwnership _out1641;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1640, out _out1641);
+              r = _out1640;
+              resultingOwnership = _out1641;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3919_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3919_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3916_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3914_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1642;
+              DCOMP._IOwnership _out1643;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3919_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1642, out _out1643);
+              r = _out1642;
+              resultingOwnership = _out1643;
+            }
+            readIdents = _3918_recIdents;
+            return ;
+          }
+        } else if (_source159.is_IIFE) {
+          Dafny.ISequence<Dafny.Rune> _3920___mcc_h204 = _source159.dtor_name;
+          DAST._IType _3921___mcc_h205 = _source159.dtor_typ;
+          DAST._IExpression _3922___mcc_h206 = _source159.dtor_value;
+          DAST._IExpression _3923___mcc_h207 = _source159.dtor_iifeBody;
+          bool _3924_isDatatype = _3580___mcc_h51;
+          bool _3925_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3926_field = _3578___mcc_h49;
+          DAST._IExpression _3927_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3928_onExpr;
+            DCOMP._IOwnership _3929_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3930_recIdents;
+            RAST._IExpr _out1644;
+            DCOMP._IOwnership _out1645;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1646;
+            (this).GenExpr(_3927_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1644, out _out1645, out _out1646);
+            _3928_onExpr = _out1644;
+            _3929_onOwned = _out1645;
+            _3930_recIdents = _out1646;
+            if ((_3924_isDatatype) || (_3925_isConstant)) {
+              r = RAST.Expr.create_Call((_3928_onExpr).Sel(DCOMP.__default.escapeIdent(_3926_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1647;
+              DCOMP._IOwnership _out1648;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1647, out _out1648);
+              r = _out1647;
+              resultingOwnership = _out1648;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3931_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3931_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3928_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3926_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1649;
+              DCOMP._IOwnership _out1650;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3931_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1649, out _out1650);
+              r = _out1649;
+              resultingOwnership = _out1650;
+            }
+            readIdents = _3930_recIdents;
+            return ;
+          }
+        } else if (_source159.is_Apply) {
+          DAST._IExpression _3932___mcc_h212 = _source159.dtor_expr;
+          Dafny.ISequence<DAST._IExpression> _3933___mcc_h213 = _source159.dtor_args;
+          bool _3934_isDatatype = _3580___mcc_h51;
+          bool _3935_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3936_field = _3578___mcc_h49;
+          DAST._IExpression _3937_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3938_onExpr;
+            DCOMP._IOwnership _3939_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3940_recIdents;
+            RAST._IExpr _out1651;
+            DCOMP._IOwnership _out1652;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1653;
+            (this).GenExpr(_3937_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1651, out _out1652, out _out1653);
+            _3938_onExpr = _out1651;
+            _3939_onOwned = _out1652;
+            _3940_recIdents = _out1653;
+            if ((_3934_isDatatype) || (_3935_isConstant)) {
+              r = RAST.Expr.create_Call((_3938_onExpr).Sel(DCOMP.__default.escapeIdent(_3936_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1654;
+              DCOMP._IOwnership _out1655;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1654, out _out1655);
+              r = _out1654;
+              resultingOwnership = _out1655;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3941_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3941_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3938_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3936_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1656;
+              DCOMP._IOwnership _out1657;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3941_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1656, out _out1657);
+              r = _out1656;
+              resultingOwnership = _out1657;
+            }
+            readIdents = _3940_recIdents;
+            return ;
+          }
+        } else if (_source159.is_TypeTest) {
+          DAST._IExpression _3942___mcc_h216 = _source159.dtor_on;
+          Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _3943___mcc_h217 = _source159.dtor_dType;
+          Dafny.ISequence<Dafny.Rune> _3944___mcc_h218 = _source159.dtor_variant;
+          bool _3945_isDatatype = _3580___mcc_h51;
+          bool _3946_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3947_field = _3578___mcc_h49;
+          DAST._IExpression _3948_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3949_onExpr;
+            DCOMP._IOwnership _3950_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3951_recIdents;
+            RAST._IExpr _out1658;
+            DCOMP._IOwnership _out1659;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1660;
+            (this).GenExpr(_3948_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1658, out _out1659, out _out1660);
+            _3949_onExpr = _out1658;
+            _3950_onOwned = _out1659;
+            _3951_recIdents = _out1660;
+            if ((_3945_isDatatype) || (_3946_isConstant)) {
+              r = RAST.Expr.create_Call((_3949_onExpr).Sel(DCOMP.__default.escapeIdent(_3947_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1661;
+              DCOMP._IOwnership _out1662;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1661, out _out1662);
+              r = _out1661;
+              resultingOwnership = _out1662;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3952_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3952_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3949_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3947_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1663;
+              DCOMP._IOwnership _out1664;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3952_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1663, out _out1664);
+              r = _out1663;
+              resultingOwnership = _out1664;
+            }
+            readIdents = _3951_recIdents;
+            return ;
+          }
+        } else if (_source159.is_InitializationValue) {
+          DAST._IType _3953___mcc_h222 = _source159.dtor_typ;
+          bool _3954_isDatatype = _3580___mcc_h51;
+          bool _3955_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3956_field = _3578___mcc_h49;
+          DAST._IExpression _3957_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3958_onExpr;
+            DCOMP._IOwnership _3959_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3960_recIdents;
+            RAST._IExpr _out1665;
+            DCOMP._IOwnership _out1666;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1667;
+            (this).GenExpr(_3957_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1665, out _out1666, out _out1667);
+            _3958_onExpr = _out1665;
+            _3959_onOwned = _out1666;
+            _3960_recIdents = _out1667;
+            if ((_3954_isDatatype) || (_3955_isConstant)) {
+              r = RAST.Expr.create_Call((_3958_onExpr).Sel(DCOMP.__default.escapeIdent(_3956_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1668;
+              DCOMP._IOwnership _out1669;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1668, out _out1669);
+              r = _out1668;
+              resultingOwnership = _out1669;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3961_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3961_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3958_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3956_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1670;
+              DCOMP._IOwnership _out1671;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3961_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1670, out _out1671);
+              r = _out1670;
+              resultingOwnership = _out1671;
+            }
+            readIdents = _3960_recIdents;
+            return ;
+          }
+        } else if (_source159.is_BoolBoundedPool) {
+          bool _3962_isDatatype = _3580___mcc_h51;
+          bool _3963_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3964_field = _3578___mcc_h49;
+          DAST._IExpression _3965_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3966_onExpr;
+            DCOMP._IOwnership _3967_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3968_recIdents;
+            RAST._IExpr _out1672;
+            DCOMP._IOwnership _out1673;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1674;
+            (this).GenExpr(_3965_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1672, out _out1673, out _out1674);
+            _3966_onExpr = _out1672;
+            _3967_onOwned = _out1673;
+            _3968_recIdents = _out1674;
+            if ((_3962_isDatatype) || (_3963_isConstant)) {
+              r = RAST.Expr.create_Call((_3966_onExpr).Sel(DCOMP.__default.escapeIdent(_3964_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1675;
+              DCOMP._IOwnership _out1676;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1675, out _out1676);
+              r = _out1675;
+              resultingOwnership = _out1676;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3969_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3969_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3966_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3964_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1677;
+              DCOMP._IOwnership _out1678;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3969_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1677, out _out1678);
+              r = _out1677;
+              resultingOwnership = _out1678;
+            }
+            readIdents = _3968_recIdents;
+            return ;
+          }
+        } else if (_source159.is_SetBoundedPool) {
+          DAST._IExpression _3970___mcc_h224 = _source159.dtor_of;
+          bool _3971_isDatatype = _3580___mcc_h51;
+          bool _3972_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3973_field = _3578___mcc_h49;
+          DAST._IExpression _3974_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3975_onExpr;
+            DCOMP._IOwnership _3976_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3977_recIdents;
+            RAST._IExpr _out1679;
+            DCOMP._IOwnership _out1680;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1681;
+            (this).GenExpr(_3974_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1679, out _out1680, out _out1681);
+            _3975_onExpr = _out1679;
+            _3976_onOwned = _out1680;
+            _3977_recIdents = _out1681;
+            if ((_3971_isDatatype) || (_3972_isConstant)) {
+              r = RAST.Expr.create_Call((_3975_onExpr).Sel(DCOMP.__default.escapeIdent(_3973_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1682;
+              DCOMP._IOwnership _out1683;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1682, out _out1683);
+              r = _out1682;
+              resultingOwnership = _out1683;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3978_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3978_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3975_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3973_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1684;
+              DCOMP._IOwnership _out1685;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3978_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1684, out _out1685);
+              r = _out1684;
+              resultingOwnership = _out1685;
+            }
+            readIdents = _3977_recIdents;
+            return ;
+          }
+        } else if (_source159.is_SeqBoundedPool) {
+          DAST._IExpression _3979___mcc_h226 = _source159.dtor_of;
+          bool _3980___mcc_h227 = _source159.dtor_includeDuplicates;
+          bool _3981_isDatatype = _3580___mcc_h51;
+          bool _3982_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3983_field = _3578___mcc_h49;
+          DAST._IExpression _3984_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3985_onExpr;
+            DCOMP._IOwnership _3986_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3987_recIdents;
+            RAST._IExpr _out1686;
+            DCOMP._IOwnership _out1687;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1688;
+            (this).GenExpr(_3984_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1686, out _out1687, out _out1688);
+            _3985_onExpr = _out1686;
+            _3986_onOwned = _out1687;
+            _3987_recIdents = _out1688;
+            if ((_3981_isDatatype) || (_3982_isConstant)) {
+              r = RAST.Expr.create_Call((_3985_onExpr).Sel(DCOMP.__default.escapeIdent(_3983_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1689;
+              DCOMP._IOwnership _out1690;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1689, out _out1690);
+              r = _out1689;
+              resultingOwnership = _out1690;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3988_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3988_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3985_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3983_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1691;
+              DCOMP._IOwnership _out1692;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3988_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1691, out _out1692);
+              r = _out1691;
+              resultingOwnership = _out1692;
+            }
+            readIdents = _3987_recIdents;
+            return ;
+          }
+        } else {
+          DAST._IExpression _3989___mcc_h230 = _source159.dtor_lo;
+          DAST._IExpression _3990___mcc_h231 = _source159.dtor_hi;
+          bool _3991_isDatatype = _3580___mcc_h51;
+          bool _3992_isConstant = _3579___mcc_h50;
+          Dafny.ISequence<Dafny.Rune> _3993_field = _3578___mcc_h49;
+          DAST._IExpression _3994_on = _3577___mcc_h48;
+          {
+            RAST._IExpr _3995_onExpr;
+            DCOMP._IOwnership _3996_onOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _3997_recIdents;
+            RAST._IExpr _out1693;
+            DCOMP._IOwnership _out1694;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1695;
+            (this).GenExpr(_3994_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1693, out _out1694, out _out1695);
+            _3995_onExpr = _out1693;
+            _3996_onOwned = _out1694;
+            _3997_recIdents = _out1695;
+            if ((_3991_isDatatype) || (_3992_isConstant)) {
+              r = RAST.Expr.create_Call((_3995_onExpr).Sel(DCOMP.__default.escapeIdent(_3993_field)), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+              RAST._IExpr _out1696;
+              DCOMP._IOwnership _out1697;
+              DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1696, out _out1697);
+              r = _out1696;
+              resultingOwnership = _out1697;
+            } else {
+              Dafny.ISequence<Dafny.Rune> _3998_s = Dafny.Sequence<Dafny.Rune>.Empty;
+              _3998_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Deref::deref(&(("), (_3995_onExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), DCOMP.__default.escapeIdent(_3993_field)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".borrow()))"));
+              RAST._IExpr _out1698;
+              DCOMP._IOwnership _out1699;
+              DCOMP.COMP.FromOwnership(RAST.Expr.create_RawExpr(_3998_s), DCOMP.Ownership.create_OwnershipBorrowed(), expectedOwnership, out _out1698, out _out1699);
+              r = _out1698;
+              resultingOwnership = _out1699;
+            }
+            readIdents = _3997_recIdents;
+            return ;
+          }
+        }
+      } else if (_source156.is_SelectFn) {
+        DAST._IExpression _3999___mcc_h234 = _source156.dtor_expr;
+        Dafny.ISequence<Dafny.Rune> _4000___mcc_h235 = _source156.dtor_field;
+        bool _4001___mcc_h236 = _source156.dtor_onDatatype;
+        bool _4002___mcc_h237 = _source156.dtor_isStatic;
+        BigInteger _4003___mcc_h238 = _source156.dtor_arity;
+        BigInteger _4004_arity = _4003___mcc_h238;
+        bool _4005_isStatic = _4002___mcc_h237;
+        bool _4006_isDatatype = _4001___mcc_h236;
+        Dafny.ISequence<Dafny.Rune> _4007_field = _4000___mcc_h235;
+        DAST._IExpression _4008_on = _3999___mcc_h234;
+        {
+          RAST._IExpr _4009_onExpr;
+          DCOMP._IOwnership _4010_onOwned;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _4011_recIdents;
+          RAST._IExpr _out1700;
+          DCOMP._IOwnership _out1701;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1702;
+          (this).GenExpr(_4008_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1700, out _out1701, out _out1702);
+          _4009_onExpr = _out1700;
+          _4010_onOwned = _out1701;
+          _4011_recIdents = _out1702;
+          Dafny.ISequence<Dafny.Rune> _4012_s = Dafny.Sequence<Dafny.Rune>.Empty;
+          Dafny.ISequence<Dafny.Rune> _4013_onString;
+          _4013_onString = (_4009_onExpr)._ToString(DCOMP.__default.IND);
+          if (_4005_isStatic) {
+            _4012_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_4013_onString, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::")), DCOMP.__default.escapeIdent(_4007_field));
+          } else {
+            _4012_s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("{\n");
+            _4012_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_4012_s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("let callTarget = (")), _4013_onString), ((object.Equals(_4010_onOwned, DCOMP.Ownership.create_OwnershipOwned())) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").clone()")))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";\n"));
+            Dafny.ISequence<Dafny.Rune> _4014_args;
+            _4014_args = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
+            BigInteger _4015_i;
+            _4015_i = BigInteger.Zero;
+            while ((_4015_i) < (_4004_arity)) {
+              if ((_4015_i).Sign == 1) {
+                _4014_args = Dafny.Sequence<Dafny.Rune>.Concat(_4014_args, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
+              }
+              _4014_args = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_4014_args, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("arg")), Std.Strings.__default.OfNat(_4015_i));
+              _4015_i = (_4015_i) + (BigInteger.One);
+            }
+            _4012_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_4012_s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("move |")), _4014_args), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("| {\n"));
+            _4012_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_4012_s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("callTarget.")), _4007_field), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _4014_args), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")\n"));
+            _4012_s = Dafny.Sequence<Dafny.Rune>.Concat(_4012_s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}\n"));
+            _4012_s = Dafny.Sequence<Dafny.Rune>.Concat(_4012_s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
+          }
+          Dafny.ISequence<Dafny.Rune> _4016_typeShape;
+          _4016_typeShape = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("dyn ::std::ops::Fn(");
+          BigInteger _4017_i;
+          _4017_i = BigInteger.Zero;
+          while ((_4017_i) < (_4004_arity)) {
+            if ((_4017_i).Sign == 1) {
+              _4016_typeShape = Dafny.Sequence<Dafny.Rune>.Concat(_4016_typeShape, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
+            }
+            _4016_typeShape = Dafny.Sequence<Dafny.Rune>.Concat(_4016_typeShape, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&_"));
+            _4017_i = (_4017_i) + (BigInteger.One);
+          }
+          _4016_typeShape = Dafny.Sequence<Dafny.Rune>.Concat(_4016_typeShape, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") -> _"));
+          _4012_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::FunctionWrapper(::std::rc::Rc::new("), _4012_s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") as ::std::rc::Rc<")), _4016_typeShape), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">)"));
+          r = RAST.Expr.create_RawExpr(_4012_s);
+          RAST._IExpr _out1703;
+          DCOMP._IOwnership _out1704;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1703, out _out1704);
+          r = _out1703;
+          resultingOwnership = _out1704;
+          readIdents = _4011_recIdents;
+          return ;
+        }
+      } else if (_source156.is_Index) {
+        DAST._IExpression _4018___mcc_h239 = _source156.dtor_expr;
+        DAST._ICollKind _4019___mcc_h240 = _source156.dtor_collKind;
+        Dafny.ISequence<DAST._IExpression> _4020___mcc_h241 = _source156.dtor_indices;
+        Dafny.ISequence<DAST._IExpression> _4021_indices = _4020___mcc_h241;
+        DAST._ICollKind _4022_collKind = _4019___mcc_h240;
+        DAST._IExpression _4023_on = _4018___mcc_h239;
+        {
+          RAST._IExpr _4024_onExpr;
+          DCOMP._IOwnership _4025_onOwned;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _4026_recIdents;
+          RAST._IExpr _out1705;
+          DCOMP._IOwnership _out1706;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1707;
+          (this).GenExpr(_4023_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipAutoBorrowed(), out _out1705, out _out1706, out _out1707);
+          _4024_onExpr = _out1705;
+          _4025_onOwned = _out1706;
+          _4026_recIdents = _out1707;
+          readIdents = _4026_recIdents;
+          r = _4024_onExpr;
+          BigInteger _4027_i;
+          _4027_i = BigInteger.Zero;
+          while ((_4027_i) < (new BigInteger((_4021_indices).Count))) {
+            if (object.Equals(_4022_collKind, DAST.CollKind.create_Array())) {
+              r = ((r).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("borrow"))).Apply(Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+            }
+            RAST._IExpr _4028_idx;
+            DCOMP._IOwnership _4029_idxOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _4030_recIdentsIdx;
+            RAST._IExpr _out1708;
+            DCOMP._IOwnership _out1709;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1710;
+            (this).GenExpr((_4021_indices).Select(_4027_i), selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1708, out _out1709, out _out1710);
+            _4028_idx = _out1708;
+            _4029_idxOwned = _out1709;
+            _4030_recIdentsIdx = _out1710;
+            r = ((r).Sel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("get"))).Apply1(_4028_idx);
+            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _4030_recIdentsIdx);
+            _4027_i = (_4027_i) + (BigInteger.One);
+          }
+          RAST._IExpr _out1711;
+          DCOMP._IOwnership _out1712;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1711, out _out1712);
+          r = _out1711;
+          resultingOwnership = _out1712;
+          return ;
+        }
+      } else if (_source156.is_IndexRange) {
+        DAST._IExpression _4031___mcc_h242 = _source156.dtor_expr;
+        bool _4032___mcc_h243 = _source156.dtor_isArray;
+        Std.Wrappers._IOption<DAST._IExpression> _4033___mcc_h244 = _source156.dtor_low;
+        Std.Wrappers._IOption<DAST._IExpression> _4034___mcc_h245 = _source156.dtor_high;
+        Std.Wrappers._IOption<DAST._IExpression> _4035_high = _4034___mcc_h245;
+        Std.Wrappers._IOption<DAST._IExpression> _4036_low = _4033___mcc_h244;
+        bool _4037_isArray = _4032___mcc_h243;
+        DAST._IExpression _4038_on = _4031___mcc_h242;
+        {
+          RAST._IExpr _4039_onExpr;
+          DCOMP._IOwnership _4040_onOwned;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _4041_recIdents;
+          RAST._IExpr _out1713;
+          DCOMP._IOwnership _out1714;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1715;
+          (this).GenExpr(_4038_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipAutoBorrowed(), out _out1713, out _out1714, out _out1715);
+          _4039_onExpr = _out1713;
+          _4040_onOwned = _out1714;
+          _4041_recIdents = _out1715;
+          readIdents = _4041_recIdents;
+          Dafny.ISequence<Dafny.Rune> _4042_methodName;
+          _4042_methodName = (((_4036_low).is_Some) ? ((((_4035_high).is_Some) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("slice")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("drop")))) : ((((_4035_high).is_Some) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("take")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")))));
+          Dafny.ISequence<RAST._IExpr> _4043_arguments;
+          _4043_arguments = Dafny.Sequence<RAST._IExpr>.FromElements();
+          Std.Wrappers._IOption<DAST._IExpression> _source160 = _4036_low;
+          if (_source160.is_None) {
+          } else {
+            DAST._IExpression _4044___mcc_h274 = _source160.dtor_value;
+            DAST._IExpression _4045_l = _4044___mcc_h274;
+            {
+              RAST._IExpr _4046_lExpr;
+              DCOMP._IOwnership _4047___v118;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _4048_recIdentsL;
+              RAST._IExpr _out1716;
+              DCOMP._IOwnership _out1717;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1718;
+              (this).GenExpr(_4045_l, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1716, out _out1717, out _out1718);
+              _4046_lExpr = _out1716;
+              _4047___v118 = _out1717;
+              _4048_recIdentsL = _out1718;
+              _4043_arguments = Dafny.Sequence<RAST._IExpr>.Concat(_4043_arguments, Dafny.Sequence<RAST._IExpr>.FromElements(_4046_lExpr));
+              readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _4048_recIdentsL);
+            }
+          }
+          Std.Wrappers._IOption<DAST._IExpression> _source161 = _4035_high;
+          if (_source161.is_None) {
+          } else {
+            DAST._IExpression _4049___mcc_h275 = _source161.dtor_value;
+            DAST._IExpression _4050_h = _4049___mcc_h275;
+            {
+              RAST._IExpr _4051_hExpr;
+              DCOMP._IOwnership _4052___v119;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _4053_recIdentsH;
+              RAST._IExpr _out1719;
+              DCOMP._IOwnership _out1720;
+              Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1721;
+              (this).GenExpr(_4050_h, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1719, out _out1720, out _out1721);
+              _4051_hExpr = _out1719;
+              _4052___v119 = _out1720;
+              _4053_recIdentsH = _out1721;
+              _4043_arguments = Dafny.Sequence<RAST._IExpr>.Concat(_4043_arguments, Dafny.Sequence<RAST._IExpr>.FromElements(_4051_hExpr));
+              readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _4053_recIdentsH);
+            }
+          }
+          r = _4039_onExpr;
+          if (_4037_isArray) {
+            if (!(_4042_methodName).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))) {
+              _4042_methodName = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_"), _4042_methodName);
+            }
+            r = ((RAST.__default.dafny__runtime__Sequence).MSel(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("from_array"), _4042_methodName))).Apply(Dafny.Sequence<RAST._IType>.FromElements(), _4043_arguments);
+          } else {
+            if (!(_4042_methodName).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))) {
+              r = ((r).Sel(_4042_methodName)).Apply(Dafny.Sequence<RAST._IType>.FromElements(), _4043_arguments);
+            }
+          }
+          RAST._IExpr _out1722;
+          DCOMP._IOwnership _out1723;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1722, out _out1723);
+          r = _out1722;
+          resultingOwnership = _out1723;
+          return ;
+        }
+      } else if (_source156.is_TupleSelect) {
+        DAST._IExpression _4054___mcc_h246 = _source156.dtor_expr;
+        BigInteger _4055___mcc_h247 = _source156.dtor_index;
+        BigInteger _4056_idx = _4055___mcc_h247;
+        DAST._IExpression _4057_on = _4054___mcc_h246;
+        {
+          RAST._IExpr _4058_onExpr;
+          DCOMP._IOwnership _4059_onOwnership;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _4060_recIdents;
+          RAST._IExpr _out1724;
+          DCOMP._IOwnership _out1725;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1726;
+          (this).GenExpr(_4057_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipAutoBorrowed(), out _out1724, out _out1725, out _out1726);
+          _4058_onExpr = _out1724;
+          _4059_onOwnership = _out1725;
+          _4060_recIdents = _out1726;
+          r = (_4058_onExpr).Sel(Std.Strings.__default.OfNat(_4056_idx));
+          RAST._IExpr _out1727;
+          DCOMP._IOwnership _out1728;
+          DCOMP.COMP.FromOwnership(r, _4059_onOwnership, expectedOwnership, out _out1727, out _out1728);
+          r = _out1727;
+          resultingOwnership = _out1728;
+          readIdents = _4060_recIdents;
+          return ;
+        }
+      } else if (_source156.is_Call) {
+        DAST._IExpression _4061___mcc_h248 = _source156.dtor_on;
+        DAST._ICallName _4062___mcc_h249 = _source156.dtor_callName;
+        Dafny.ISequence<DAST._IType> _4063___mcc_h250 = _source156.dtor_typeArgs;
+        Dafny.ISequence<DAST._IExpression> _4064___mcc_h251 = _source156.dtor_args;
+        Dafny.ISequence<DAST._IExpression> _4065_args = _4064___mcc_h251;
+        Dafny.ISequence<DAST._IType> _4066_typeArgs = _4063___mcc_h250;
+        DAST._ICallName _4067_name = _4062___mcc_h249;
+        DAST._IExpression _4068_on = _4061___mcc_h248;
+        {
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          Dafny.ISequence<RAST._IType> _4069_typeExprs;
+          _4069_typeExprs = Dafny.Sequence<RAST._IType>.FromElements();
+          if ((new BigInteger((_4066_typeArgs).Count)) >= (BigInteger.One)) {
+            BigInteger _4070_typeI;
+            _4070_typeI = BigInteger.Zero;
+            while ((_4070_typeI) < (new BigInteger((_4066_typeArgs).Count))) {
+              RAST._IType _4071_typeExpr;
+              RAST._IType _out1729;
+              _out1729 = (this).GenType((_4066_typeArgs).Select(_4070_typeI), false, false);
+              _4071_typeExpr = _out1729;
+              _4069_typeExprs = Dafny.Sequence<RAST._IType>.Concat(_4069_typeExprs, Dafny.Sequence<RAST._IType>.FromElements(_4071_typeExpr));
+              _4070_typeI = (_4070_typeI) + (BigInteger.One);
+            }
+          }
+          Dafny.ISequence<RAST._IExpr> _4072_argExprs;
+          _4072_argExprs = Dafny.Sequence<RAST._IExpr>.FromElements();
+          BigInteger _4073_i;
+          _4073_i = BigInteger.Zero;
+          while ((_4073_i) < (new BigInteger((_4065_args).Count))) {
+            RAST._IExpr _4074_argExpr;
+            DCOMP._IOwnership _4075_argOwnership;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _4076_argIdents;
+            RAST._IExpr _out1730;
+            DCOMP._IOwnership _out1731;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1732;
+            (this).GenExpr((_4065_args).Select(_4073_i), selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1730, out _out1731, out _out1732);
+            _4074_argExpr = _out1730;
+            _4075_argOwnership = _out1731;
+            _4076_argIdents = _out1732;
+            _4072_argExprs = Dafny.Sequence<RAST._IExpr>.Concat(_4072_argExprs, Dafny.Sequence<RAST._IExpr>.FromElements(_4074_argExpr));
+            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _4076_argIdents);
+            _4073_i = (_4073_i) + (BigInteger.One);
+          }
+          RAST._IExpr _4077_onExpr;
+          DCOMP._IOwnership _4078___v120;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _4079_recIdents;
+          RAST._IExpr _out1733;
+          DCOMP._IOwnership _out1734;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1735;
+          (this).GenExpr(_4068_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipAutoBorrowed(), out _out1733, out _out1734, out _out1735);
+          _4077_onExpr = _out1733;
+          _4078___v120 = _out1734;
+          _4079_recIdents = _out1735;
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _4079_recIdents);
+          Dafny.ISequence<Dafny.Rune> _4080_renderedName;
+          _4080_renderedName = ((System.Func<DAST._ICallName, Dafny.ISequence<Dafny.Rune>>)((_source162) => {
+            if (_source162.is_Name) {
+              Dafny.ISequence<Dafny.Rune> _4081___mcc_h276 = _source162.dtor_name;
+              Dafny.ISequence<Dafny.Rune> _4082_ident = _4081___mcc_h276;
+              return DCOMP.__default.escapeIdent(_4082_ident);
+            } else if (_source162.is_MapBuilderAdd) {
+              return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("add");
+            } else if (_source162.is_MapBuilderBuild) {
+              return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("build");
+            } else if (_source162.is_SetBuilderAdd) {
+              return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("add");
+            } else {
+              return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("build");
+            }
+          }))(_4067_name);
+          DAST._IExpression _source163 = _4068_on;
+          if (_source163.is_Literal) {
+            DAST._ILiteral _4083___mcc_h277 = _source163.dtor_Literal_a0;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_Ident) {
+            Dafny.ISequence<Dafny.Rune> _4084___mcc_h279 = _source163.dtor_Ident_a0;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_Companion) {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _4085___mcc_h281 = _source163.dtor_Companion_a0;
+            {
+              _4077_onExpr = (_4077_onExpr).MSel(_4080_renderedName);
+            }
+          } else if (_source163.is_Tuple) {
+            Dafny.ISequence<DAST._IExpression> _4086___mcc_h283 = _source163.dtor_Tuple_a0;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_New) {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _4087___mcc_h285 = _source163.dtor_path;
+            Dafny.ISequence<DAST._IType> _4088___mcc_h286 = _source163.dtor_typeArgs;
+            Dafny.ISequence<DAST._IExpression> _4089___mcc_h287 = _source163.dtor_args;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_NewArray) {
+            Dafny.ISequence<DAST._IExpression> _4090___mcc_h291 = _source163.dtor_dims;
+            DAST._IType _4091___mcc_h292 = _source163.dtor_typ;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_DatatypeValue) {
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _4092___mcc_h295 = _source163.dtor_path;
+            Dafny.ISequence<DAST._IType> _4093___mcc_h296 = _source163.dtor_typeArgs;
+            Dafny.ISequence<Dafny.Rune> _4094___mcc_h297 = _source163.dtor_variant;
+            bool _4095___mcc_h298 = _source163.dtor_isCo;
+            Dafny.ISequence<_System._ITuple2<Dafny.ISequence<Dafny.Rune>, DAST._IExpression>> _4096___mcc_h299 = _source163.dtor_contents;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_Convert) {
+            DAST._IExpression _4097___mcc_h305 = _source163.dtor_value;
+            DAST._IType _4098___mcc_h306 = _source163.dtor_from;
+            DAST._IType _4099___mcc_h307 = _source163.dtor_typ;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_SeqConstruct) {
+            DAST._IExpression _4100___mcc_h311 = _source163.dtor_length;
+            DAST._IExpression _4101___mcc_h312 = _source163.dtor_elem;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_SeqValue) {
+            Dafny.ISequence<DAST._IExpression> _4102___mcc_h315 = _source163.dtor_elements;
+            DAST._IType _4103___mcc_h316 = _source163.dtor_typ;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_SetValue) {
+            Dafny.ISequence<DAST._IExpression> _4104___mcc_h319 = _source163.dtor_elements;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_MultisetValue) {
+            Dafny.ISequence<DAST._IExpression> _4105___mcc_h321 = _source163.dtor_elements;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_MapValue) {
+            Dafny.ISequence<_System._ITuple2<DAST._IExpression, DAST._IExpression>> _4106___mcc_h323 = _source163.dtor_mapElems;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_MapBuilder) {
+            DAST._IType _4107___mcc_h325 = _source163.dtor_keyType;
+            DAST._IType _4108___mcc_h326 = _source163.dtor_valueType;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_SeqUpdate) {
+            DAST._IExpression _4109___mcc_h329 = _source163.dtor_expr;
+            DAST._IExpression _4110___mcc_h330 = _source163.dtor_indexExpr;
+            DAST._IExpression _4111___mcc_h331 = _source163.dtor_value;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_MapUpdate) {
+            DAST._IExpression _4112___mcc_h335 = _source163.dtor_expr;
+            DAST._IExpression _4113___mcc_h336 = _source163.dtor_indexExpr;
+            DAST._IExpression _4114___mcc_h337 = _source163.dtor_value;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_SetBuilder) {
+            DAST._IType _4115___mcc_h341 = _source163.dtor_elemType;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_ToMultiset) {
+            DAST._IExpression _4116___mcc_h343 = _source163.dtor_ToMultiset_a0;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_This) {
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_Ite) {
+            DAST._IExpression _4117___mcc_h345 = _source163.dtor_cond;
+            DAST._IExpression _4118___mcc_h346 = _source163.dtor_thn;
+            DAST._IExpression _4119___mcc_h347 = _source163.dtor_els;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_UnOp) {
+            DAST._IUnaryOp _4120___mcc_h351 = _source163.dtor_unOp;
+            DAST._IExpression _4121___mcc_h352 = _source163.dtor_expr;
+            DAST.Format._IUnaryOpFormat _4122___mcc_h353 = _source163.dtor_format1;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_BinOp) {
+            DAST._IBinOp _4123___mcc_h357 = _source163.dtor_op;
+            DAST._IExpression _4124___mcc_h358 = _source163.dtor_left;
+            DAST._IExpression _4125___mcc_h359 = _source163.dtor_right;
+            DAST.Format._IBinaryOpFormat _4126___mcc_h360 = _source163.dtor_format2;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_ArrayLen) {
+            DAST._IExpression _4127___mcc_h365 = _source163.dtor_expr;
+            BigInteger _4128___mcc_h366 = _source163.dtor_dim;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_MapKeys) {
+            DAST._IExpression _4129___mcc_h369 = _source163.dtor_expr;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_MapValues) {
+            DAST._IExpression _4130___mcc_h371 = _source163.dtor_expr;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_Select) {
+            DAST._IExpression _4131___mcc_h373 = _source163.dtor_expr;
+            Dafny.ISequence<Dafny.Rune> _4132___mcc_h374 = _source163.dtor_field;
+            bool _4133___mcc_h375 = _source163.dtor_isConstant;
+            bool _4134___mcc_h376 = _source163.dtor_onDatatype;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_SelectFn) {
+            DAST._IExpression _4135___mcc_h381 = _source163.dtor_expr;
+            Dafny.ISequence<Dafny.Rune> _4136___mcc_h382 = _source163.dtor_field;
+            bool _4137___mcc_h383 = _source163.dtor_onDatatype;
+            bool _4138___mcc_h384 = _source163.dtor_isStatic;
+            BigInteger _4139___mcc_h385 = _source163.dtor_arity;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_Index) {
+            DAST._IExpression _4140___mcc_h391 = _source163.dtor_expr;
+            DAST._ICollKind _4141___mcc_h392 = _source163.dtor_collKind;
+            Dafny.ISequence<DAST._IExpression> _4142___mcc_h393 = _source163.dtor_indices;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_IndexRange) {
+            DAST._IExpression _4143___mcc_h397 = _source163.dtor_expr;
+            bool _4144___mcc_h398 = _source163.dtor_isArray;
+            Std.Wrappers._IOption<DAST._IExpression> _4145___mcc_h399 = _source163.dtor_low;
+            Std.Wrappers._IOption<DAST._IExpression> _4146___mcc_h400 = _source163.dtor_high;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_TupleSelect) {
+            DAST._IExpression _4147___mcc_h405 = _source163.dtor_expr;
+            BigInteger _4148___mcc_h406 = _source163.dtor_index;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_Call) {
+            DAST._IExpression _4149___mcc_h409 = _source163.dtor_on;
+            DAST._ICallName _4150___mcc_h410 = _source163.dtor_callName;
+            Dafny.ISequence<DAST._IType> _4151___mcc_h411 = _source163.dtor_typeArgs;
+            Dafny.ISequence<DAST._IExpression> _4152___mcc_h412 = _source163.dtor_args;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_Lambda) {
+            Dafny.ISequence<DAST._IFormal> _4153___mcc_h417 = _source163.dtor_params;
+            DAST._IType _4154___mcc_h418 = _source163.dtor_retType;
+            Dafny.ISequence<DAST._IStatement> _4155___mcc_h419 = _source163.dtor_body;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_BetaRedex) {
+            Dafny.ISequence<_System._ITuple2<DAST._IFormal, DAST._IExpression>> _4156___mcc_h423 = _source163.dtor_values;
+            DAST._IType _4157___mcc_h424 = _source163.dtor_retType;
+            DAST._IExpression _4158___mcc_h425 = _source163.dtor_expr;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_IIFE) {
+            Dafny.ISequence<Dafny.Rune> _4159___mcc_h429 = _source163.dtor_name;
+            DAST._IType _4160___mcc_h430 = _source163.dtor_typ;
+            DAST._IExpression _4161___mcc_h431 = _source163.dtor_value;
+            DAST._IExpression _4162___mcc_h432 = _source163.dtor_iifeBody;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_Apply) {
+            DAST._IExpression _4163___mcc_h437 = _source163.dtor_expr;
+            Dafny.ISequence<DAST._IExpression> _4164___mcc_h438 = _source163.dtor_args;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_TypeTest) {
+            DAST._IExpression _4165___mcc_h441 = _source163.dtor_on;
+            Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _4166___mcc_h442 = _source163.dtor_dType;
+            Dafny.ISequence<Dafny.Rune> _4167___mcc_h443 = _source163.dtor_variant;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_InitializationValue) {
+            DAST._IType _4168___mcc_h447 = _source163.dtor_typ;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_BoolBoundedPool) {
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_SetBoundedPool) {
+            DAST._IExpression _4169___mcc_h449 = _source163.dtor_of;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else if (_source163.is_SeqBoundedPool) {
+            DAST._IExpression _4170___mcc_h451 = _source163.dtor_of;
+            bool _4171___mcc_h452 = _source163.dtor_includeDuplicates;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          } else {
+            DAST._IExpression _4172___mcc_h455 = _source163.dtor_lo;
+            DAST._IExpression _4173___mcc_h456 = _source163.dtor_hi;
+            {
+              _4077_onExpr = (_4077_onExpr).Sel(_4080_renderedName);
+            }
+          }
+          r = RAST.Expr.create_Call(_4077_onExpr, _4069_typeExprs, _4072_argExprs);
+          RAST._IExpr _out1736;
+          DCOMP._IOwnership _out1737;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1736, out _out1737);
+          r = _out1736;
+          resultingOwnership = _out1737;
+          return ;
+        }
+      } else if (_source156.is_Lambda) {
+        Dafny.ISequence<DAST._IFormal> _4174___mcc_h252 = _source156.dtor_params;
+        DAST._IType _4175___mcc_h253 = _source156.dtor_retType;
+        Dafny.ISequence<DAST._IStatement> _4176___mcc_h254 = _source156.dtor_body;
+        Dafny.ISequence<DAST._IStatement> _4177_body = _4176___mcc_h254;
+        DAST._IType _4178_retType = _4175___mcc_h253;
+        Dafny.ISequence<DAST._IFormal> _4179_params = _4174___mcc_h252;
+        {
+          Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _4180_paramNames;
+          _4180_paramNames = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          BigInteger _4181_i;
+          _4181_i = BigInteger.Zero;
+          while ((_4181_i) < (new BigInteger((_4179_params).Count))) {
+            _4180_paramNames = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Concat(_4180_paramNames, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements(((_4179_params).Select(_4181_i)).dtor_name));
+            _4181_i = (_4181_i) + (BigInteger.One);
+          }
+          RAST._IExpr _4182_recursiveGen;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _4183_recIdents;
+          RAST._IExpr _out1738;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1739;
+          (this).GenStmts(_4177_body, ((!object.Equals(selfIdent, Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None())) ? (Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_Some(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_this"))) : (Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None())), _4180_paramNames, true, RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")), out _out1738, out _out1739);
+          _4182_recursiveGen = _out1738;
+          _4183_recIdents = _out1739;
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          Dafny.ISequence<Dafny.Rune> _4184_allReadCloned;
+          _4184_allReadCloned = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
+          while (!(_4183_recIdents).Equals(Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements())) {
+            Dafny.ISequence<Dafny.Rune> _4185_next;
+            foreach (Dafny.ISequence<Dafny.Rune> _assign_such_that_3 in (_4183_recIdents).Elements) {
+              _4185_next = (Dafny.ISequence<Dafny.Rune>)_assign_such_that_3;
+              if ((_4183_recIdents).Contains(_4185_next)) {
+                goto after__ASSIGN_SUCH_THAT_3;
+              }
+            }
+            throw new System.Exception("assign-such-that search produced no value (line 3280)");
+          after__ASSIGN_SUCH_THAT_3: ;
+            if ((!object.Equals(selfIdent, Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None())) && ((_4185_next).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("_this")))) {
+              if (!object.Equals(selfIdent, Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None())) {
+                _4184_allReadCloned = Dafny.Sequence<Dafny.Rune>.Concat(_4184_allReadCloned, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("let _this = self.clone();\n"));
+              }
+            } else if (!((_4180_paramNames).Contains(_4185_next))) {
+              _4184_allReadCloned = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_4184_allReadCloned, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("let ")), DCOMP.__default.escapeIdent(_4185_next)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" = ")), DCOMP.__default.escapeIdent(_4185_next)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".clone();\n"));
+              readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements(_4185_next));
+            }
+            _4183_recIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Difference(_4183_recIdents, Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements(_4185_next));
+          }
+          Dafny.ISequence<Dafny.Rune> _4186_paramsString;
+          _4186_paramsString = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
+          Dafny.ISequence<Dafny.Rune> _4187_paramTypes;
+          _4187_paramTypes = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
+          _4181_i = BigInteger.Zero;
+          while ((_4181_i) < (new BigInteger((_4179_params).Count))) {
+            if ((_4181_i).Sign == 1) {
+              _4186_paramsString = Dafny.Sequence<Dafny.Rune>.Concat(_4186_paramsString, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
+              _4187_paramTypes = Dafny.Sequence<Dafny.Rune>.Concat(_4187_paramTypes, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
+            }
+            RAST._IType _4188_typStr;
+            RAST._IType _out1740;
+            _out1740 = (this).GenType(((_4179_params).Select(_4181_i)).dtor_typ, false, true);
+            _4188_typStr = _out1740;
+            _4186_paramsString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_4186_paramsString, DCOMP.__default.escapeIdent(((_4179_params).Select(_4181_i)).dtor_name)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(": ")), (RAST.Type.create_Borrowed(_4188_typStr))._ToString(DCOMP.__default.IND));
+            _4187_paramTypes = Dafny.Sequence<Dafny.Rune>.Concat(_4187_paramTypes, (RAST.Type.create_Borrowed(_4188_typStr))._ToString(DCOMP.__default.IND));
+            _4181_i = (_4181_i) + (BigInteger.One);
+          }
+          RAST._IType _4189_retTypeGen;
+          RAST._IType _out1741;
+          _out1741 = (this).GenType(_4178_retType, false, true);
+          _4189_retTypeGen = _out1741;
+          r = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::FunctionWrapper::<::std::rc::Rc<dyn ::std::ops::Fn("), _4187_paramTypes), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") -> ")), (_4189_retTypeGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">>({\n")), _4184_allReadCloned), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::rc::Rc::new(move |")), _4186_paramsString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("| -> ")), (_4189_retTypeGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {\n")), (_4182_recursiveGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n})})")));
+          RAST._IExpr _out1742;
+          DCOMP._IOwnership _out1743;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1742, out _out1743);
+          r = _out1742;
+          resultingOwnership = _out1743;
+          return ;
+        }
+      } else if (_source156.is_BetaRedex) {
+        Dafny.ISequence<_System._ITuple2<DAST._IFormal, DAST._IExpression>> _4190___mcc_h255 = _source156.dtor_values;
+        DAST._IType _4191___mcc_h256 = _source156.dtor_retType;
+        DAST._IExpression _4192___mcc_h257 = _source156.dtor_expr;
+        DAST._IExpression _4193_expr = _4192___mcc_h257;
+        DAST._IType _4194_retType = _4191___mcc_h256;
+        Dafny.ISequence<_System._ITuple2<DAST._IFormal, DAST._IExpression>> _4195_values = _4190___mcc_h255;
+        {
+          Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _4196_paramNames;
+          _4196_paramNames = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _4197_paramNamesSet;
+          _4197_paramNamesSet = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          BigInteger _4198_i;
+          _4198_i = BigInteger.Zero;
+          while ((_4198_i) < (new BigInteger((_4195_values).Count))) {
+            _4196_paramNames = Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Concat(_4196_paramNames, Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements((((_4195_values).Select(_4198_i)).dtor__0).dtor_name));
+            _4197_paramNamesSet = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(_4197_paramNamesSet, Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements((((_4195_values).Select(_4198_i)).dtor__0).dtor_name));
+            _4198_i = (_4198_i) + (BigInteger.One);
+          }
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          Dafny.ISequence<Dafny.Rune> _4199_s;
+          _4199_s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("{\n");
+          Dafny.ISequence<Dafny.Rune> _4200_paramsString;
+          _4200_paramsString = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
+          _4198_i = BigInteger.Zero;
+          while ((_4198_i) < (new BigInteger((_4195_values).Count))) {
+            if ((_4198_i).Sign == 1) {
+              _4200_paramsString = Dafny.Sequence<Dafny.Rune>.Concat(_4200_paramsString, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
+            }
+            RAST._IType _4201_typStr;
+            RAST._IType _out1744;
+            _out1744 = (this).GenType((((_4195_values).Select(_4198_i)).dtor__0).dtor_typ, false, true);
+            _4201_typStr = _out1744;
+            RAST._IExpr _4202_valueGen;
+            DCOMP._IOwnership _4203___v123;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _4204_recIdents;
+            RAST._IExpr _out1745;
+            DCOMP._IOwnership _out1746;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1747;
+            (this).GenExpr(((_4195_values).Select(_4198_i)).dtor__1, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out1745, out _out1746, out _out1747);
+            _4202_valueGen = _out1745;
+            _4203___v123 = _out1746;
+            _4204_recIdents = _out1747;
+            _4199_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_4199_s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("let ")), DCOMP.__default.escapeIdent((((_4195_values).Select(_4198_i)).dtor__0).dtor_name)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(": ")), (_4201_typStr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" = "));
+            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _4204_recIdents);
+            _4199_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_4199_s, (_4202_valueGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";\n"));
+            _4198_i = (_4198_i) + (BigInteger.One);
+          }
+          RAST._IExpr _4205_recGen;
+          DCOMP._IOwnership _4206_recOwned;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _4207_recIdents;
+          RAST._IExpr _out1748;
+          DCOMP._IOwnership _out1749;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1750;
+          (this).GenExpr(_4193_expr, selfIdent, _4196_paramNames, expectedOwnership, out _out1748, out _out1749, out _out1750);
+          _4205_recGen = _out1748;
+          _4206_recOwned = _out1749;
+          _4207_recIdents = _out1750;
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Difference(_4207_recIdents, _4197_paramNamesSet);
+          _4199_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_4199_s, (_4205_recGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n}"));
+          r = RAST.Expr.create_RawExpr(_4199_s);
+          RAST._IExpr _out1751;
+          DCOMP._IOwnership _out1752;
+          DCOMP.COMP.FromOwnership(r, _4206_recOwned, expectedOwnership, out _out1751, out _out1752);
+          r = _out1751;
+          resultingOwnership = _out1752;
+          return ;
+        }
+      } else if (_source156.is_IIFE) {
+        Dafny.ISequence<Dafny.Rune> _4208___mcc_h258 = _source156.dtor_name;
+        DAST._IType _4209___mcc_h259 = _source156.dtor_typ;
+        DAST._IExpression _4210___mcc_h260 = _source156.dtor_value;
+        DAST._IExpression _4211___mcc_h261 = _source156.dtor_iifeBody;
+        DAST._IExpression _4212_iifeBody = _4211___mcc_h261;
+        DAST._IExpression _4213_value = _4210___mcc_h260;
+        DAST._IType _4214_tpe = _4209___mcc_h259;
+        Dafny.ISequence<Dafny.Rune> _4215_name = _4208___mcc_h258;
+        {
+          RAST._IExpr _4216_valueGen;
+          DCOMP._IOwnership _4217___v124;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _4218_recIdents;
+          RAST._IExpr _out1753;
+          DCOMP._IOwnership _out1754;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1755;
+          (this).GenExpr(_4213_value, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out1753, out _out1754, out _out1755);
+          _4216_valueGen = _out1753;
+          _4217___v124 = _out1754;
+          _4218_recIdents = _out1755;
+          readIdents = _4218_recIdents;
+          RAST._IType _4219_valueTypeGen;
+          RAST._IType _out1756;
+          _out1756 = (this).GenType(_4214_tpe, false, true);
+          _4219_valueTypeGen = _out1756;
+          RAST._IExpr _4220_bodyGen;
+          DCOMP._IOwnership _4221___v125;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _4222_bodyIdents;
+          RAST._IExpr _out1757;
+          DCOMP._IOwnership _out1758;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1759;
+          (this).GenExpr(_4212_iifeBody, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out1757, out _out1758, out _out1759);
+          _4220_bodyGen = _out1757;
+          _4221___v125 = _out1758;
+          _4222_bodyIdents = _out1759;
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Difference(_4222_bodyIdents, Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements((_4215_name))));
+          r = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("{\nlet "), DCOMP.__default.escapeIdent((_4215_name))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(": ")), (_4219_valueTypeGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" = ")), (_4216_valueGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";\n")), (_4220_bodyGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n}")));
+          RAST._IExpr _out1760;
+          DCOMP._IOwnership _out1761;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1760, out _out1761);
+          r = _out1760;
+          resultingOwnership = _out1761;
+          return ;
+        }
+      } else if (_source156.is_Apply) {
+        DAST._IExpression _4223___mcc_h262 = _source156.dtor_expr;
+        Dafny.ISequence<DAST._IExpression> _4224___mcc_h263 = _source156.dtor_args;
+        Dafny.ISequence<DAST._IExpression> _4225_args = _4224___mcc_h263;
+        DAST._IExpression _4226_func = _4223___mcc_h262;
+        {
+          RAST._IExpr _4227_funcExpr;
+          DCOMP._IOwnership _4228___v126;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _4229_recIdents;
+          RAST._IExpr _out1762;
+          DCOMP._IOwnership _out1763;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1764;
+          (this).GenExpr(_4226_func, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1762, out _out1763, out _out1764);
+          _4227_funcExpr = _out1762;
+          _4228___v126 = _out1763;
+          _4229_recIdents = _out1764;
+          readIdents = _4229_recIdents;
+          Dafny.ISequence<Dafny.Rune> _4230_argString;
+          _4230_argString = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
+          BigInteger _4231_i;
+          _4231_i = BigInteger.Zero;
+          while ((_4231_i) < (new BigInteger((_4225_args).Count))) {
+            if ((_4231_i).Sign == 1) {
+              _4230_argString = Dafny.Sequence<Dafny.Rune>.Concat(_4230_argString, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "));
+            }
+            RAST._IExpr _4232_argExpr;
+            DCOMP._IOwnership _4233_argOwned;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _4234_argIdents;
+            RAST._IExpr _out1765;
+            DCOMP._IOwnership _out1766;
+            Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1767;
+            (this).GenExpr((_4225_args).Select(_4231_i), selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1765, out _out1766, out _out1767);
+            _4232_argExpr = _out1765;
+            _4233_argOwned = _out1766;
+            _4234_argIdents = _out1767;
+            Dafny.ISequence<Dafny.Rune> _4235_argExprString;
+            _4235_argExprString = (_4232_argExpr)._ToString(DCOMP.__default.IND);
+            if (object.Equals(_4233_argOwned, DCOMP.Ownership.create_OwnershipOwned())) {
+              _4235_argExprString = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), _4235_argExprString);
+            }
+            _4230_argString = Dafny.Sequence<Dafny.Rune>.Concat(_4230_argString, _4235_argExprString);
+            readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(readIdents, _4234_argIdents);
+            _4231_i = (_4231_i) + (BigInteger.One);
+          }
+          r = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(("), (_4227_funcExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").0")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), _4230_argString), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("))")));
+          RAST._IExpr _out1768;
+          DCOMP._IOwnership _out1769;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1768, out _out1769);
+          r = _out1768;
+          resultingOwnership = _out1769;
+          return ;
+        }
+      } else if (_source156.is_TypeTest) {
+        DAST._IExpression _4236___mcc_h264 = _source156.dtor_on;
+        Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _4237___mcc_h265 = _source156.dtor_dType;
+        Dafny.ISequence<Dafny.Rune> _4238___mcc_h266 = _source156.dtor_variant;
+        Dafny.ISequence<Dafny.Rune> _4239_variant = _4238___mcc_h266;
+        Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _4240_dType = _4237___mcc_h265;
+        DAST._IExpression _4241_on = _4236___mcc_h264;
+        {
+          RAST._IExpr _4242_exprGen;
+          DCOMP._IOwnership _4243___v127;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _4244_recIdents;
+          RAST._IExpr _out1770;
+          DCOMP._IOwnership _out1771;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1772;
+          (this).GenExpr(_4241_on, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1770, out _out1771, out _out1772);
+          _4242_exprGen = _out1770;
+          _4243___v127 = _out1771;
+          _4244_recIdents = _out1772;
+          Dafny.ISequence<Dafny.Rune> _4245_dTypePath;
+          Dafny.ISequence<Dafny.Rune> _out1773;
+          _out1773 = DCOMP.COMP.GenPath(_4240_dType);
+          _4245_dTypePath = _out1773;
+          r = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("matches!("), (_4242_exprGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".as_ref(), ")), _4245_dTypePath), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::")), DCOMP.__default.escapeIdent(_4239_variant)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("{ .. })")));
+          RAST._IExpr _out1774;
+          DCOMP._IOwnership _out1775;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1774, out _out1775);
+          r = _out1774;
+          resultingOwnership = _out1775;
+          readIdents = _4244_recIdents;
+          return ;
+        }
+      } else if (_source156.is_InitializationValue) {
+        DAST._IType _4246___mcc_h267 = _source156.dtor_typ;
+        DAST._IType _4247_typ = _4246___mcc_h267;
+        {
+          RAST._IType _4248_typExpr;
+          RAST._IType _out1776;
+          _out1776 = (this).GenType(_4247_typ, false, false);
+          _4248_typExpr = _out1776;
+          r = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), (_4248_typExpr)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as std::default::Default>::default()")));
+          RAST._IExpr _out1777;
+          DCOMP._IOwnership _out1778;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1777, out _out1778);
+          r = _out1777;
+          resultingOwnership = _out1778;
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          return ;
+        }
+      } else if (_source156.is_BoolBoundedPool) {
+        {
+          r = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("[false, true]"));
+          RAST._IExpr _out1779;
+          DCOMP._IOwnership _out1780;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1779, out _out1780);
+          r = _out1779;
+          resultingOwnership = _out1780;
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.FromElements();
+          return ;
+        }
+      } else if (_source156.is_SetBoundedPool) {
+        DAST._IExpression _4249___mcc_h268 = _source156.dtor_of;
+        DAST._IExpression _4250_of = _4249___mcc_h268;
+        {
+          RAST._IExpr _4251_exprGen;
+          DCOMP._IOwnership _4252___v128;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _4253_recIdents;
+          RAST._IExpr _out1781;
+          DCOMP._IOwnership _out1782;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1783;
+          (this).GenExpr(_4250_of, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1781, out _out1782, out _out1783);
+          _4251_exprGen = _out1781;
+          _4252___v128 = _out1782;
+          _4253_recIdents = _out1783;
+          r = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), (_4251_exprGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").iter()")));
+          RAST._IExpr _out1784;
+          DCOMP._IOwnership _out1785;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1784, out _out1785);
+          r = _out1784;
+          resultingOwnership = _out1785;
+          readIdents = _4253_recIdents;
+          return ;
+        }
+      } else if (_source156.is_SeqBoundedPool) {
+        DAST._IExpression _4254___mcc_h269 = _source156.dtor_of;
+        bool _4255___mcc_h270 = _source156.dtor_includeDuplicates;
+        bool _4256_includeDuplicates = _4255___mcc_h270;
+        DAST._IExpression _4257_of = _4254___mcc_h269;
+        {
+          RAST._IExpr _4258_exprGen;
+          DCOMP._IOwnership _4259___v129;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _4260_recIdents;
+          RAST._IExpr _out1786;
+          DCOMP._IOwnership _out1787;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1788;
+          (this).GenExpr(_4257_of, selfIdent, @params, DCOMP.Ownership.create_OwnershipBorrowed(), out _out1786, out _out1787, out _out1788);
+          _4258_exprGen = _out1786;
+          _4259___v129 = _out1787;
+          _4260_recIdents = _out1788;
+          Dafny.ISequence<Dafny.Rune> _4261_s;
+          _4261_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), (_4258_exprGen)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").iter()"));
+          if (!(_4256_includeDuplicates)) {
+            _4261_s = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::itertools::Itertools::unique("), _4261_s), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
+          }
+          r = RAST.Expr.create_RawExpr(_4261_s);
+          RAST._IExpr _out1789;
+          DCOMP._IOwnership _out1790;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1789, out _out1790);
+          r = _out1789;
+          resultingOwnership = _out1790;
+          readIdents = _4260_recIdents;
+          return ;
+        }
+      } else {
+        DAST._IExpression _4262___mcc_h271 = _source156.dtor_lo;
+        DAST._IExpression _4263___mcc_h272 = _source156.dtor_hi;
+        DAST._IExpression _4264_hi = _4263___mcc_h272;
+        DAST._IExpression _4265_lo = _4262___mcc_h271;
+        {
+          RAST._IExpr _4266_lo;
+          DCOMP._IOwnership _4267___v130;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _4268_recIdentsLo;
+          RAST._IExpr _out1791;
+          DCOMP._IOwnership _out1792;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1793;
+          (this).GenExpr(_4265_lo, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out1791, out _out1792, out _out1793);
+          _4266_lo = _out1791;
+          _4267___v130 = _out1792;
+          _4268_recIdentsLo = _out1793;
+          RAST._IExpr _4269_hi;
+          DCOMP._IOwnership _4270___v131;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _4271_recIdentsHi;
+          RAST._IExpr _out1794;
+          DCOMP._IOwnership _out1795;
+          Dafny.ISet<Dafny.ISequence<Dafny.Rune>> _out1796;
+          (this).GenExpr(_4264_hi, selfIdent, @params, DCOMP.Ownership.create_OwnershipOwned(), out _out1794, out _out1795, out _out1796);
+          _4269_hi = _out1794;
+          _4270___v131 = _out1795;
+          _4271_recIdentsHi = _out1796;
+          r = RAST.Expr.create_RawExpr(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::integer_range("), (_4266_lo)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")), (_4269_hi)._ToString(DCOMP.__default.IND)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")));
+          RAST._IExpr _out1797;
+          DCOMP._IOwnership _out1798;
+          DCOMP.COMP.FromOwned(r, expectedOwnership, out _out1797, out _out1798);
+          r = _out1797;
+          resultingOwnership = _out1798;
+          readIdents = Dafny.Set<Dafny.ISequence<Dafny.Rune>>.Union(_4268_recIdentsLo, _4271_recIdentsHi);
+          return ;
+        }
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> Compile(Dafny.ISequence<DAST._IModule> p)
+    {
+      Dafny.ISequence<Dafny.Rune> s = Dafny.Sequence<Dafny.Rune>.Empty;
+      s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("#![allow(warnings, unconditional_panic)]\n");
+      s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("#![allow(nonstandard_style)]\n"));
+      s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("extern crate dafny_runtime;\n"));
+      BigInteger _4272_i;
+      _4272_i = BigInteger.Zero;
+      while ((_4272_i) < (new BigInteger((p).Count))) {
+        Dafny.ISequence<Dafny.Rune> _4273_generated = Dafny.Sequence<Dafny.Rune>.Empty;
+        RAST._IMod _4274_m;
+        RAST._IMod _out1799;
+        _out1799 = (this).GenModule((p).Select(_4272_i), Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.FromElements());
+        _4274_m = _out1799;
+        _4273_generated = (_4274_m)._ToString(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""));
+        if ((_4272_i).Sign == 1) {
+          s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"));
+        }
+        s = Dafny.Sequence<Dafny.Rune>.Concat(s, _4273_generated);
+        _4272_i = (_4272_i) + (BigInteger.One);
+      }
+      return s;
+    }
+    public static Dafny.ISequence<Dafny.Rune> EmitCallToMain(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> fullName)
+    {
+      Dafny.ISequence<Dafny.Rune> s = Dafny.Sequence<Dafny.Rune>.Empty;
+      s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\nfn main() {\n");
+      BigInteger _4275_i;
+      _4275_i = BigInteger.Zero;
+      while ((_4275_i) < (new BigInteger((fullName).Count))) {
+        if ((_4275_i).Sign == 1) {
+          s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::"));
+        }
+        s = Dafny.Sequence<Dafny.Rune>.Concat(s, DCOMP.__default.escapeIdent((fullName).Select(_4275_i)));
+        _4275_i = (_4275_i) + (BigInteger.One);
+      }
+      s = Dafny.Sequence<Dafny.Rune>.Concat(s, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("();\n}"));
+      return s;
+    }
+    public bool _UnicodeChars {get; set;}
+    public bool UnicodeChars { get {
+      return this._UnicodeChars;
+    } }
+    public Dafny.ISequence<Dafny.Rune> DafnyChar { get {
+      if ((this).UnicodeChars) {
+        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("DafnyChar");
+      } else {
+        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("DafnyCharUTF16");
+      }
+    } }
+    public static Dafny.IMap<DAST._IBinOp,Dafny.ISequence<Dafny.Rune>> OpTable { get {
+      return Dafny.Map<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>.FromElements(new Dafny.Pair<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>(DAST.BinOp.create_Mod(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("%")), new Dafny.Pair<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>(DAST.BinOp.create_And(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&&")), new Dafny.Pair<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>(DAST.BinOp.create_Or(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("||")), new Dafny.Pair<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>(DAST.BinOp.create_Div(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/")), new Dafny.Pair<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>(DAST.BinOp.create_Lt(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<")), new Dafny.Pair<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>(DAST.BinOp.create_LtChar(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<")), new Dafny.Pair<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>(DAST.BinOp.create_Plus(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("+")), new Dafny.Pair<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>(DAST.BinOp.create_Minus(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("-")), new Dafny.Pair<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>(DAST.BinOp.create_Times(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("*")), new Dafny.Pair<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>(DAST.BinOp.create_BitwiseAnd(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&")), new Dafny.Pair<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>(DAST.BinOp.create_BitwiseOr(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("|")), new Dafny.Pair<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>(DAST.BinOp.create_BitwiseXor(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("^")), new Dafny.Pair<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>(DAST.BinOp.create_BitwiseShiftRight(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">>")), new Dafny.Pair<DAST._IBinOp, Dafny.ISequence<Dafny.Rune>>(DAST.BinOp.create_BitwiseShiftLeft(), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<<")));
+    } }
+  }
+} // end of namespace DCOMP
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/Formatting.cs b/Source/DafnyCore/GeneratedFromDafny/Formatting.cs
new file mode 100644
index 00000000000..786cf0e03d6
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/Formatting.cs
@@ -0,0 +1,46 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace Formatting {
+
+  public partial class __default {
+    public static System.String ReindentProgramFromFirstToken(Microsoft.Dafny.IToken firstToken, Formatting.IIndentationFormatter reindent)
+    {
+      System.String s = default(System.String);
+      Microsoft.Dafny.IToken token;
+      token = firstToken;
+      System.Text.StringBuilder sb;
+      System.Text.StringBuilder _nw0 = new System.Text.StringBuilder();
+      sb = _nw0;
+      while ((token) != (object) ((Microsoft.Dafny.IToken)null)) {
+        System.String newLeadingTrivia;
+        newLeadingTrivia = (reindent).GetNewLeadingTrivia(token);
+        System.String newTrailingTrivia;
+        newTrailingTrivia = (reindent).GetNewTrailingTrivia(token);
+        (sb).Append(newLeadingTrivia);
+        (sb).Append(token.val);
+        (sb).Append(newTrailingTrivia);
+        token = token.Next;
+      }
+      System.String _out0;
+      _out0 = (sb).ToString().ToString();
+      s = _out0;
+      return s;
+    }
+  }
+
+  public interface IIndentationFormatter {
+    System.String GetNewLeadingTrivia(Microsoft.Dafny.IToken token);
+    System.String GetNewTrailingTrivia(Microsoft.Dafny.IToken token);
+  }
+  public class _Companion_IIndentationFormatter {
+  }
+} // end of namespace Formatting
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/RAST.cs b/Source/DafnyCore/GeneratedFromDafny/RAST.cs
new file mode 100644
index 00000000000..78b9e425b73
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/RAST.cs
@@ -0,0 +1,6390 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace RAST {
+
+  public partial class __default {
+    public static Dafny.ISequence<Dafny.Rune> SeqToString<__T>(Dafny.ISequence<__T> s, Func<__T, Dafny.ISequence<Dafny.Rune>> f, Dafny.ISequence<Dafny.Rune> separator)
+    {
+      if ((new BigInteger((s).Count)).Sign == 0) {
+        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
+      } else {
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Helpers.Id<Func<__T, Dafny.ISequence<Dafny.Rune>>>(f)((s).Select(BigInteger.Zero)), (((new BigInteger((s).Count)) > (BigInteger.One)) ? (Dafny.Sequence<Dafny.Rune>.Concat(separator, RAST.__default.SeqToString<__T>((s).Drop(BigInteger.One), f, separator))) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))));
+      }
+    }
+    public static BigInteger SeqToHeight<__T>(Dafny.ISequence<__T> s, Func<__T, BigInteger> f)
+    {
+      if ((new BigInteger((s).Count)).Sign == 0) {
+        return BigInteger.Zero;
+      } else {
+        BigInteger _828_i = Dafny.Helpers.Id<Func<__T, BigInteger>>(f)((s).Select(BigInteger.Zero));
+        BigInteger _829_j = RAST.__default.SeqToHeight<__T>((s).Drop(BigInteger.One), f);
+        if ((_828_i) < (_829_j)) {
+          return _829_j;
+        } else {
+          return _828_i;
+        }
+      }
+    }
+    public static RAST._IType Rc(RAST._IType underlying) {
+      return RAST.Type.create_TypeApp(((RAST.__default.std__type).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("rc"))).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Rc")), Dafny.Sequence<RAST._IType>.FromElements(underlying));
+    }
+    public static RAST._IType RefCell(RAST._IType underlying) {
+      return RAST.Type.create_TypeApp(((RAST.__default.std__type).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("cell"))).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("RefCell")), Dafny.Sequence<RAST._IType>.FromElements(underlying));
+    }
+    public static RAST._IType Vec(RAST._IType underlying) {
+      return RAST.Type.create_TypeApp(((RAST.__default.std__type).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("vec"))).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Vec")), Dafny.Sequence<RAST._IType>.FromElements(underlying));
+    }
+    public static RAST._IExpr NewVec(Dafny.ISequence<RAST._IExpr> elements) {
+      return RAST.Expr.create_Call(RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("vec!")), Dafny.Sequence<RAST._IType>.FromElements(), elements);
+    }
+    public static RAST._IExpr Clone(RAST._IExpr underlying) {
+      return RAST.Expr.create_Call(RAST.Expr.create_Select(underlying, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("clone")), Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements());
+    }
+    public static RAST._IExpr Borrow(RAST._IExpr underlying) {
+      return RAST.Expr.create_UnaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), underlying, DAST.Format.UnaryOpFormat.create_NoFormat());
+    }
+    public static RAST._IExpr BorrowMut(RAST._IExpr underlying) {
+      return RAST.Expr.create_UnaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&mut"), underlying, DAST.Format.UnaryOpFormat.create_NoFormat());
+    }
+    public static RAST._IType RawType(Dafny.ISequence<Dafny.Rune> content) {
+      return RAST.Type.create_TIdentifier(content);
+    }
+    public static Dafny.ISequence<Dafny.Rune> AddIndent(Dafny.ISequence<Dafny.Rune> raw, Dafny.ISequence<Dafny.Rune> ind)
+    {
+      Dafny.ISequence<Dafny.Rune> _830___accumulator = Dafny.Sequence<Dafny.Rune>.FromElements();
+    TAIL_CALL_START: ;
+      if ((new BigInteger((raw).Count)).Sign == 0) {
+        return Dafny.Sequence<Dafny.Rune>.Concat(_830___accumulator, raw);
+      } else if ((Dafny.Sequence<Dafny.Rune>.UnicodeFromString("[({")).Contains((raw).Select(BigInteger.Zero))) {
+        _830___accumulator = Dafny.Sequence<Dafny.Rune>.Concat(_830___accumulator, Dafny.Sequence<Dafny.Rune>.FromElements((raw).Select(BigInteger.Zero)));
+        Dafny.ISequence<Dafny.Rune> _in103 = (raw).Drop(BigInteger.One);
+        Dafny.ISequence<Dafny.Rune> _in104 = Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND);
+        raw = _in103;
+        ind = _in104;
+        goto TAIL_CALL_START;
+      } else if (((Dafny.Sequence<Dafny.Rune>.UnicodeFromString("})]")).Contains((raw).Select(BigInteger.Zero))) && ((new BigInteger((ind).Count)) > (new BigInteger(2)))) {
+        _830___accumulator = Dafny.Sequence<Dafny.Rune>.Concat(_830___accumulator, Dafny.Sequence<Dafny.Rune>.FromElements((raw).Select(BigInteger.Zero)));
+        Dafny.ISequence<Dafny.Rune> _in105 = (raw).Drop(BigInteger.One);
+        Dafny.ISequence<Dafny.Rune> _in106 = (ind).Take((new BigInteger((ind).Count)) - (new BigInteger(2)));
+        raw = _in105;
+        ind = _in106;
+        goto TAIL_CALL_START;
+      } else if (((raw).Select(BigInteger.Zero)) == (new Dafny.Rune('\n'))) {
+        _830___accumulator = Dafny.Sequence<Dafny.Rune>.Concat(_830___accumulator, Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.FromElements((raw).Select(BigInteger.Zero)), ind));
+        Dafny.ISequence<Dafny.Rune> _in107 = (raw).Drop(BigInteger.One);
+        Dafny.ISequence<Dafny.Rune> _in108 = ind;
+        raw = _in107;
+        ind = _in108;
+        goto TAIL_CALL_START;
+      } else {
+        _830___accumulator = Dafny.Sequence<Dafny.Rune>.Concat(_830___accumulator, Dafny.Sequence<Dafny.Rune>.FromElements((raw).Select(BigInteger.Zero)));
+        Dafny.ISequence<Dafny.Rune> _in109 = (raw).Drop(BigInteger.One);
+        Dafny.ISequence<Dafny.Rune> _in110 = ind;
+        raw = _in109;
+        ind = _in110;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static BigInteger max(BigInteger i, BigInteger j)
+    {
+      if ((i) < (j)) {
+        return j;
+      } else {
+        return i;
+      }
+    }
+    public static RAST._IExpr RcNew(RAST._IExpr underlying) {
+      return RAST.Expr.create_Call(RAST.__default.std__rc__Rc__new, Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(underlying));
+    }
+    public static RAST._IType Self { get {
+      return RAST.Type.create_Borrowed(RAST.Type.create_SelfOwned());
+    } }
+    public static RAST._IType SelfMut { get {
+      return RAST.Type.create_BorrowedMut(RAST.Type.create_SelfOwned());
+    } }
+    public static RAST._IType global__type { get {
+      return RAST.Type.create_TIdentifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""));
+    } }
+    public static RAST._IType std__type { get {
+      return (RAST.__default.global__type).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("std"));
+    } }
+    public static RAST._IType CloneTrait { get {
+      return RAST.__default.RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Clone"));
+    } }
+    public static RAST._IType DafnyPrintTrait { get {
+      return RAST.__default.RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::dafny_runtime::DafnyPrint"));
+    } }
+    public static RAST._IType DefaultTrait { get {
+      return RAST.__default.RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::default::Default"));
+    } }
+    public static RAST._IType StaticTrait { get {
+      return RAST.__default.RawType(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("'static"));
+    } }
+    public static RAST._IType cell__type { get {
+      return (RAST.__default.std__type).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("cell"));
+    } }
+    public static RAST._IType refcell__type { get {
+      return (RAST.__default.cell__type).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("RefCell"));
+    } }
+    public static RAST._IType dafny__runtime__type { get {
+      return (RAST.__default.global__type).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("dafny_runtime"));
+    } }
+    public static Dafny.ISequence<Dafny.Rune> IND { get {
+      return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("  ");
+    } }
+    public static RAST._IExpr @global { get {
+      return RAST.Expr.create_Identifier(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""));
+    } }
+    public static RAST._IExpr dafny__runtime { get {
+      return (RAST.__default.@global).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("dafny_runtime"));
+    } }
+    public static RAST._IExpr dafny__runtime__Set { get {
+      return (RAST.__default.dafny__runtime).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Set"));
+    } }
+    public static RAST._IExpr dafny__runtime__Set__from__array { get {
+      return (RAST.__default.dafny__runtime__Set).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("from_array"));
+    } }
+    public static RAST._IExpr dafny__runtime__Sequence { get {
+      return (RAST.__default.dafny__runtime).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Sequence"));
+    } }
+    public static RAST._IExpr Sequence__from__array__owned { get {
+      return (RAST.__default.dafny__runtime__Sequence).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("from_array_owned"));
+    } }
+    public static RAST._IExpr Sequence__from__array { get {
+      return (RAST.__default.dafny__runtime__Sequence).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("from_array"));
+    } }
+    public static RAST._IExpr dafny__runtime__Multiset { get {
+      return (RAST.__default.dafny__runtime).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Multiset"));
+    } }
+    public static RAST._IExpr dafny__runtime__Multiset__from__array { get {
+      return (RAST.__default.dafny__runtime__Multiset).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("from_array"));
+    } }
+    public static RAST._IExpr std { get {
+      return (RAST.__default.@global).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("std"));
+    } }
+    public static RAST._IExpr std__rc { get {
+      return (RAST.__default.std).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("rc"));
+    } }
+    public static RAST._IExpr std__rc__Rc { get {
+      return (RAST.__default.std__rc).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Rc"));
+    } }
+    public static RAST._IExpr std__rc__Rc__new { get {
+      return (RAST.__default.std__rc__Rc).MSel(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("new"));
+    } }
+  }
+
+  public interface _IMod {
+    bool is_Mod { get; }
+    bool is_ExternMod { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
+    Dafny.ISequence<RAST._IModDecl> dtor_body { get; }
+    _IMod DowncastClone();
+    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
+  }
+  public abstract class Mod : _IMod {
+    public Mod() {
+    }
+    private static readonly RAST._IMod theDefault = create_Mod(Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<RAST._IModDecl>.Empty);
+    public static RAST._IMod Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<RAST._IMod> _TYPE = new Dafny.TypeDescriptor<RAST._IMod>(RAST.Mod.Default());
+    public static Dafny.TypeDescriptor<RAST._IMod> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IMod create_Mod(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<RAST._IModDecl> body) {
+      return new Mod_Mod(name, body);
+    }
+    public static _IMod create_ExternMod(Dafny.ISequence<Dafny.Rune> name) {
+      return new Mod_ExternMod(name);
+    }
+    public bool is_Mod { get { return this is Mod_Mod; } }
+    public bool is_ExternMod { get { return this is Mod_ExternMod; } }
+    public Dafny.ISequence<Dafny.Rune> dtor_name {
+      get {
+        var d = this;
+        if (d is Mod_Mod) { return ((Mod_Mod)d)._name; }
+        return ((Mod_ExternMod)d)._name;
+      }
+    }
+    public Dafny.ISequence<RAST._IModDecl> dtor_body {
+      get {
+        var d = this;
+        return ((Mod_Mod)d)._body;
+      }
+    }
+    public abstract _IMod DowncastClone();
+    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
+      RAST._IMod _source25 = this;
+      if (_source25.is_Mod) {
+        Dafny.ISequence<Dafny.Rune> _831___mcc_h0 = _source25.dtor_name;
+        Dafny.ISequence<RAST._IModDecl> _832___mcc_h1 = _source25.dtor_body;
+        Dafny.ISequence<RAST._IModDecl> _833_body = _832___mcc_h1;
+        Dafny.ISequence<Dafny.Rune> _834_name = _831___mcc_h0;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("mod "), _834_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {")), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n")), ind), RAST.__default.IND), RAST.__default.SeqToString<RAST._IModDecl>(_833_body, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._IModDecl, Dafny.ISequence<Dafny.Rune>>>>((_835_ind) => ((System.Func<RAST._IModDecl, Dafny.ISequence<Dafny.Rune>>)((_836_modDecl) => {
+          return (_836_modDecl)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_835_ind, RAST.__default.IND));
+        })))(ind), Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), ind), RAST.__default.IND))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n")), ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
+      } else {
+        Dafny.ISequence<Dafny.Rune> _837___mcc_h2 = _source25.dtor_name;
+        Dafny.ISequence<Dafny.Rune> _838_name = _837___mcc_h2;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("mod "), _838_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";"));
+      }
+    }
+  }
+  public class Mod_Mod : Mod {
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public readonly Dafny.ISequence<RAST._IModDecl> _body;
+    public Mod_Mod(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<RAST._IModDecl> body) : base() {
+      this._name = name;
+      this._body = body;
+    }
+    public override _IMod DowncastClone() {
+      if (this is _IMod dt) { return dt; }
+      return new Mod_Mod(_name, _body);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Mod_Mod;
+      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._body, oth._body);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Mod.Mod";
+      s += "(";
+      s += this._name.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._body);
+      s += ")";
+      return s;
+    }
+  }
+  public class Mod_ExternMod : Mod {
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public Mod_ExternMod(Dafny.ISequence<Dafny.Rune> name) : base() {
+      this._name = name;
+    }
+    public override _IMod DowncastClone() {
+      if (this is _IMod dt) { return dt; }
+      return new Mod_ExternMod(_name);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Mod_ExternMod;
+      return oth != null && object.Equals(this._name, oth._name);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Mod.ExternMod";
+      s += "(";
+      s += this._name.ToVerbatimString(true);
+      s += ")";
+      return s;
+    }
+  }
+
+  public interface _IModDecl {
+    bool is_RawDecl { get; }
+    bool is_ModDecl { get; }
+    bool is_StructDecl { get; }
+    bool is_EnumDecl { get; }
+    bool is_ImplDecl { get; }
+    bool is_TraitDecl { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_body { get; }
+    RAST._IMod dtor_mod { get; }
+    RAST._IStruct dtor_struct { get; }
+    RAST._IEnum dtor_enum { get; }
+    RAST._IImpl dtor_impl { get; }
+    RAST._ITrait dtor_tr { get; }
+    _IModDecl DowncastClone();
+    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
+  }
+  public abstract class ModDecl : _IModDecl {
+    public ModDecl() {
+    }
+    private static readonly RAST._IModDecl theDefault = create_RawDecl(Dafny.Sequence<Dafny.Rune>.Empty);
+    public static RAST._IModDecl Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<RAST._IModDecl> _TYPE = new Dafny.TypeDescriptor<RAST._IModDecl>(RAST.ModDecl.Default());
+    public static Dafny.TypeDescriptor<RAST._IModDecl> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IModDecl create_RawDecl(Dafny.ISequence<Dafny.Rune> body) {
+      return new ModDecl_RawDecl(body);
+    }
+    public static _IModDecl create_ModDecl(RAST._IMod mod) {
+      return new ModDecl_ModDecl(mod);
+    }
+    public static _IModDecl create_StructDecl(RAST._IStruct @struct) {
+      return new ModDecl_StructDecl(@struct);
+    }
+    public static _IModDecl create_EnumDecl(RAST._IEnum @enum) {
+      return new ModDecl_EnumDecl(@enum);
+    }
+    public static _IModDecl create_ImplDecl(RAST._IImpl impl) {
+      return new ModDecl_ImplDecl(impl);
+    }
+    public static _IModDecl create_TraitDecl(RAST._ITrait tr) {
+      return new ModDecl_TraitDecl(tr);
+    }
+    public bool is_RawDecl { get { return this is ModDecl_RawDecl; } }
+    public bool is_ModDecl { get { return this is ModDecl_ModDecl; } }
+    public bool is_StructDecl { get { return this is ModDecl_StructDecl; } }
+    public bool is_EnumDecl { get { return this is ModDecl_EnumDecl; } }
+    public bool is_ImplDecl { get { return this is ModDecl_ImplDecl; } }
+    public bool is_TraitDecl { get { return this is ModDecl_TraitDecl; } }
+    public Dafny.ISequence<Dafny.Rune> dtor_body {
+      get {
+        var d = this;
+        return ((ModDecl_RawDecl)d)._body;
+      }
+    }
+    public RAST._IMod dtor_mod {
+      get {
+        var d = this;
+        return ((ModDecl_ModDecl)d)._mod;
+      }
+    }
+    public RAST._IStruct dtor_struct {
+      get {
+        var d = this;
+        return ((ModDecl_StructDecl)d)._struct;
+      }
+    }
+    public RAST._IEnum dtor_enum {
+      get {
+        var d = this;
+        return ((ModDecl_EnumDecl)d)._enum;
+      }
+    }
+    public RAST._IImpl dtor_impl {
+      get {
+        var d = this;
+        return ((ModDecl_ImplDecl)d)._impl;
+      }
+    }
+    public RAST._ITrait dtor_tr {
+      get {
+        var d = this;
+        return ((ModDecl_TraitDecl)d)._tr;
+      }
+    }
+    public abstract _IModDecl DowncastClone();
+    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
+      if ((this).is_ModDecl) {
+        return ((this).dtor_mod)._ToString(ind);
+      } else if ((this).is_StructDecl) {
+        return ((this).dtor_struct)._ToString(ind);
+      } else if ((this).is_ImplDecl) {
+        return ((this).dtor_impl)._ToString(ind);
+      } else if ((this).is_EnumDecl) {
+        return ((this).dtor_enum)._ToString(ind);
+      } else if ((this).is_TraitDecl) {
+        return ((this).dtor_tr)._ToString(ind);
+      } else {
+        return (this).dtor_body;
+      }
+    }
+  }
+  public class ModDecl_RawDecl : ModDecl {
+    public readonly Dafny.ISequence<Dafny.Rune> _body;
+    public ModDecl_RawDecl(Dafny.ISequence<Dafny.Rune> body) : base() {
+      this._body = body;
+    }
+    public override _IModDecl DowncastClone() {
+      if (this is _IModDecl dt) { return dt; }
+      return new ModDecl_RawDecl(_body);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.ModDecl_RawDecl;
+      return oth != null && object.Equals(this._body, oth._body);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.ModDecl.RawDecl";
+      s += "(";
+      s += this._body.ToVerbatimString(true);
+      s += ")";
+      return s;
+    }
+  }
+  public class ModDecl_ModDecl : ModDecl {
+    public readonly RAST._IMod _mod;
+    public ModDecl_ModDecl(RAST._IMod mod) : base() {
+      this._mod = mod;
+    }
+    public override _IModDecl DowncastClone() {
+      if (this is _IModDecl dt) { return dt; }
+      return new ModDecl_ModDecl(_mod);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.ModDecl_ModDecl;
+      return oth != null && object.Equals(this._mod, oth._mod);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._mod));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.ModDecl.ModDecl";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._mod);
+      s += ")";
+      return s;
+    }
+  }
+  public class ModDecl_StructDecl : ModDecl {
+    public readonly RAST._IStruct _struct;
+    public ModDecl_StructDecl(RAST._IStruct @struct) : base() {
+      this._struct = @struct;
+    }
+    public override _IModDecl DowncastClone() {
+      if (this is _IModDecl dt) { return dt; }
+      return new ModDecl_StructDecl(_struct);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.ModDecl_StructDecl;
+      return oth != null && object.Equals(this._struct, oth._struct);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 2;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._struct));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.ModDecl.StructDecl";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._struct);
+      s += ")";
+      return s;
+    }
+  }
+  public class ModDecl_EnumDecl : ModDecl {
+    public readonly RAST._IEnum _enum;
+    public ModDecl_EnumDecl(RAST._IEnum @enum) : base() {
+      this._enum = @enum;
+    }
+    public override _IModDecl DowncastClone() {
+      if (this is _IModDecl dt) { return dt; }
+      return new ModDecl_EnumDecl(_enum);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.ModDecl_EnumDecl;
+      return oth != null && object.Equals(this._enum, oth._enum);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 3;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._enum));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.ModDecl.EnumDecl";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._enum);
+      s += ")";
+      return s;
+    }
+  }
+  public class ModDecl_ImplDecl : ModDecl {
+    public readonly RAST._IImpl _impl;
+    public ModDecl_ImplDecl(RAST._IImpl impl) : base() {
+      this._impl = impl;
+    }
+    public override _IModDecl DowncastClone() {
+      if (this is _IModDecl dt) { return dt; }
+      return new ModDecl_ImplDecl(_impl);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.ModDecl_ImplDecl;
+      return oth != null && object.Equals(this._impl, oth._impl);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 4;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._impl));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.ModDecl.ImplDecl";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._impl);
+      s += ")";
+      return s;
+    }
+  }
+  public class ModDecl_TraitDecl : ModDecl {
+    public readonly RAST._ITrait _tr;
+    public ModDecl_TraitDecl(RAST._ITrait tr) : base() {
+      this._tr = tr;
+    }
+    public override _IModDecl DowncastClone() {
+      if (this is _IModDecl dt) { return dt; }
+      return new ModDecl_TraitDecl(_tr);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.ModDecl_TraitDecl;
+      return oth != null && object.Equals(this._tr, oth._tr);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 5;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._tr));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.ModDecl.TraitDecl";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._tr);
+      s += ")";
+      return s;
+    }
+  }
+
+  public interface _IAttribute {
+    bool is_RawAttribute { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_content { get; }
+  }
+  public class Attribute : _IAttribute {
+    public readonly Dafny.ISequence<Dafny.Rune> _content;
+    public Attribute(Dafny.ISequence<Dafny.Rune> content) {
+      this._content = content;
+    }
+    public static Dafny.ISequence<Dafny.Rune> DowncastClone(Dafny.ISequence<Dafny.Rune> _this) {
+      return _this;
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Attribute;
+      return oth != null && object.Equals(this._content, oth._content);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._content));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Attribute.RawAttribute";
+      s += "(";
+      s += this._content.ToVerbatimString(true);
+      s += ")";
+      return s;
+    }
+    private static readonly Dafny.ISequence<Dafny.Rune> theDefault = Dafny.Sequence<Dafny.Rune>.Empty;
+    public static Dafny.ISequence<Dafny.Rune> Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>> _TYPE = new Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>>(Dafny.Sequence<Dafny.Rune>.Empty);
+    public static Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IAttribute create(Dafny.ISequence<Dafny.Rune> content) {
+      return new Attribute(content);
+    }
+    public static _IAttribute create_RawAttribute(Dafny.ISequence<Dafny.Rune> content) {
+      return create(content);
+    }
+    public bool is_RawAttribute { get { return true; } }
+    public Dafny.ISequence<Dafny.Rune> dtor_content {
+      get {
+        return this._content;
+      }
+    }
+    public static Dafny.ISequence<Dafny.Rune> ToStringMultiple(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> attributes, Dafny.ISequence<Dafny.Rune> ind)
+    {
+      return RAST.__default.SeqToString<Dafny.ISequence<Dafny.Rune>>(attributes, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>>>((_839_ind) => ((System.Func<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>)((_840_attribute) => {
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat((_840_attribute), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n")), _839_ind);
+      })))(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""));
+    }
+  }
+
+  public interface _IStruct {
+    bool is_Struct { get; }
+    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_attributes { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
+    Dafny.ISequence<RAST._ITypeParam> dtor_typeParams { get; }
+    RAST._IFormals dtor_fields { get; }
+    _IStruct DowncastClone();
+    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
+  }
+  public class Struct : _IStruct {
+    public readonly Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _attributes;
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public readonly Dafny.ISequence<RAST._ITypeParam> _typeParams;
+    public readonly RAST._IFormals _fields;
+    public Struct(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> attributes, Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<RAST._ITypeParam> typeParams, RAST._IFormals fields) {
+      this._attributes = attributes;
+      this._name = name;
+      this._typeParams = typeParams;
+      this._fields = fields;
+    }
+    public _IStruct DowncastClone() {
+      if (this is _IStruct dt) { return dt; }
+      return new Struct(_attributes, _name, _typeParams, _fields);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Struct;
+      return oth != null && object.Equals(this._attributes, oth._attributes) && object.Equals(this._name, oth._name) && object.Equals(this._typeParams, oth._typeParams) && object.Equals(this._fields, oth._fields);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._attributes));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeParams));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._fields));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Struct.Struct";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._attributes);
+      s += ", ";
+      s += this._name.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._typeParams);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._fields);
+      s += ")";
+      return s;
+    }
+    private static readonly RAST._IStruct theDefault = create(Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Empty, Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<RAST._ITypeParam>.Empty, RAST.Formals.Default());
+    public static RAST._IStruct Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<RAST._IStruct> _TYPE = new Dafny.TypeDescriptor<RAST._IStruct>(RAST.Struct.Default());
+    public static Dafny.TypeDescriptor<RAST._IStruct> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IStruct create(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> attributes, Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<RAST._ITypeParam> typeParams, RAST._IFormals fields) {
+      return new Struct(attributes, name, typeParams, fields);
+    }
+    public static _IStruct create_Struct(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> attributes, Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<RAST._ITypeParam> typeParams, RAST._IFormals fields) {
+      return create(attributes, name, typeParams, fields);
+    }
+    public bool is_Struct { get { return true; } }
+    public Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_attributes {
+      get {
+        return this._attributes;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_name {
+      get {
+        return this._name;
+      }
+    }
+    public Dafny.ISequence<RAST._ITypeParam> dtor_typeParams {
+      get {
+        return this._typeParams;
+      }
+    }
+    public RAST._IFormals dtor_fields {
+      get {
+        return this._fields;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
+      return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(RAST.Attribute.ToStringMultiple((this).dtor_attributes, ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("pub struct ")), (this).dtor_name), RAST.TypeParam.ToStringMultiple((this).dtor_typeParams, ind)), ((this).dtor_fields)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND), ((this).dtor_fields).is_NamedFormals)), ((((this).dtor_fields).is_NamelessFormals) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))));
+    }
+  }
+
+  public interface _INamelessFormal {
+    bool is_NamelessFormal { get; }
+    RAST._IVisibility dtor_visibility { get; }
+    RAST._IType dtor_tpe { get; }
+    _INamelessFormal DowncastClone();
+    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
+  }
+  public class NamelessFormal : _INamelessFormal {
+    public readonly RAST._IVisibility _visibility;
+    public readonly RAST._IType _tpe;
+    public NamelessFormal(RAST._IVisibility visibility, RAST._IType tpe) {
+      this._visibility = visibility;
+      this._tpe = tpe;
+    }
+    public _INamelessFormal DowncastClone() {
+      if (this is _INamelessFormal dt) { return dt; }
+      return new NamelessFormal(_visibility, _tpe);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.NamelessFormal;
+      return oth != null && object.Equals(this._visibility, oth._visibility) && object.Equals(this._tpe, oth._tpe);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._visibility));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._tpe));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.NamelessFormal.NamelessFormal";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._visibility);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._tpe);
+      s += ")";
+      return s;
+    }
+    private static readonly RAST._INamelessFormal theDefault = create(RAST.Visibility.Default(), RAST.Type.Default());
+    public static RAST._INamelessFormal Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<RAST._INamelessFormal> _TYPE = new Dafny.TypeDescriptor<RAST._INamelessFormal>(RAST.NamelessFormal.Default());
+    public static Dafny.TypeDescriptor<RAST._INamelessFormal> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _INamelessFormal create(RAST._IVisibility visibility, RAST._IType tpe) {
+      return new NamelessFormal(visibility, tpe);
+    }
+    public static _INamelessFormal create_NamelessFormal(RAST._IVisibility visibility, RAST._IType tpe) {
+      return create(visibility, tpe);
+    }
+    public bool is_NamelessFormal { get { return true; } }
+    public RAST._IVisibility dtor_visibility {
+      get {
+        return this._visibility;
+      }
+    }
+    public RAST._IType dtor_tpe {
+      get {
+        return this._tpe;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
+      return Dafny.Sequence<Dafny.Rune>.Concat(((object.Equals((this).dtor_visibility, RAST.Visibility.create_PUB())) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("pub ")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))), ((this).dtor_tpe)._ToString(ind));
+    }
+  }
+
+  public interface _IFormals {
+    bool is_NamedFormals { get; }
+    bool is_NamelessFormals { get; }
+    Dafny.ISequence<RAST._IFormal> dtor_fields { get; }
+    Dafny.ISequence<RAST._INamelessFormal> dtor_types { get; }
+    _IFormals DowncastClone();
+    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind, bool newLine);
+  }
+  public abstract class Formals : _IFormals {
+    public Formals() {
+    }
+    private static readonly RAST._IFormals theDefault = create_NamedFormals(Dafny.Sequence<RAST._IFormal>.Empty);
+    public static RAST._IFormals Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<RAST._IFormals> _TYPE = new Dafny.TypeDescriptor<RAST._IFormals>(RAST.Formals.Default());
+    public static Dafny.TypeDescriptor<RAST._IFormals> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IFormals create_NamedFormals(Dafny.ISequence<RAST._IFormal> fields) {
+      return new Formals_NamedFormals(fields);
+    }
+    public static _IFormals create_NamelessFormals(Dafny.ISequence<RAST._INamelessFormal> types) {
+      return new Formals_NamelessFormals(types);
+    }
+    public bool is_NamedFormals { get { return this is Formals_NamedFormals; } }
+    public bool is_NamelessFormals { get { return this is Formals_NamelessFormals; } }
+    public Dafny.ISequence<RAST._IFormal> dtor_fields {
+      get {
+        var d = this;
+        return ((Formals_NamedFormals)d)._fields;
+      }
+    }
+    public Dafny.ISequence<RAST._INamelessFormal> dtor_types {
+      get {
+        var d = this;
+        return ((Formals_NamelessFormals)d)._types;
+      }
+    }
+    public abstract _IFormals DowncastClone();
+    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind, bool newLine)
+    {
+      if ((this).is_NamedFormals) {
+        Dafny.ISequence<Dafny.Rune> _841_separator = ((newLine) ? (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(",\n"), ind), RAST.__default.IND)) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")));
+        _System._ITuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>> _let_tmp_rhs40 = (((newLine) && ((new BigInteger(((this).dtor_fields).Count)).Sign == 1)) ? (_System.Tuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>.create(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), ind), RAST.__default.IND), Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), ind))) : ((((new BigInteger(((this).dtor_fields).Count)).Sign == 1) ? (_System.Tuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" "), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" "))) : (_System.Tuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))))));
+        Dafny.ISequence<Dafny.Rune> _842_beginSpace = _let_tmp_rhs40.dtor__0;
+        Dafny.ISequence<Dafny.Rune> _843_endSpace = _let_tmp_rhs40.dtor__1;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {"), _842_beginSpace), RAST.__default.SeqToString<RAST._IFormal>((this).dtor_fields, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._IFormal, Dafny.ISequence<Dafny.Rune>>>>((_844_ind) => ((System.Func<RAST._IFormal, Dafny.ISequence<Dafny.Rune>>)((_845_field) => {
+          return (_845_field)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_844_ind, RAST.__default.IND));
+        })))(ind), _841_separator)), _843_endSpace), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
+      } else {
+        Dafny.ISequence<Dafny.Rune> _846_separator = ((newLine) ? (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(",\n"), ind), RAST.__default.IND)) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", ")));
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), RAST.__default.SeqToString<RAST._INamelessFormal>((this).dtor_types, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._INamelessFormal, Dafny.ISequence<Dafny.Rune>>>>((_847_ind) => ((System.Func<RAST._INamelessFormal, Dafny.ISequence<Dafny.Rune>>)((_848_t) => {
+          return (_848_t)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_847_ind, RAST.__default.IND));
+        })))(ind), _846_separator)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
+      }
+    }
+  }
+  public class Formals_NamedFormals : Formals {
+    public readonly Dafny.ISequence<RAST._IFormal> _fields;
+    public Formals_NamedFormals(Dafny.ISequence<RAST._IFormal> fields) : base() {
+      this._fields = fields;
+    }
+    public override _IFormals DowncastClone() {
+      if (this is _IFormals dt) { return dt; }
+      return new Formals_NamedFormals(_fields);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Formals_NamedFormals;
+      return oth != null && object.Equals(this._fields, oth._fields);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._fields));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Formals.NamedFormals";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._fields);
+      s += ")";
+      return s;
+    }
+  }
+  public class Formals_NamelessFormals : Formals {
+    public readonly Dafny.ISequence<RAST._INamelessFormal> _types;
+    public Formals_NamelessFormals(Dafny.ISequence<RAST._INamelessFormal> types) : base() {
+      this._types = types;
+    }
+    public override _IFormals DowncastClone() {
+      if (this is _IFormals dt) { return dt; }
+      return new Formals_NamelessFormals(_types);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Formals_NamelessFormals;
+      return oth != null && object.Equals(this._types, oth._types);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._types));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Formals.NamelessFormals";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._types);
+      s += ")";
+      return s;
+    }
+  }
+
+  public interface _IEnumCase {
+    bool is_EnumCase { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
+    RAST._IFormals dtor_fields { get; }
+    _IEnumCase DowncastClone();
+    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind, bool newLine);
+  }
+  public class EnumCase : _IEnumCase {
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public readonly RAST._IFormals _fields;
+    public EnumCase(Dafny.ISequence<Dafny.Rune> name, RAST._IFormals fields) {
+      this._name = name;
+      this._fields = fields;
+    }
+    public _IEnumCase DowncastClone() {
+      if (this is _IEnumCase dt) { return dt; }
+      return new EnumCase(_name, _fields);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.EnumCase;
+      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._fields, oth._fields);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._fields));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.EnumCase.EnumCase";
+      s += "(";
+      s += this._name.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._fields);
+      s += ")";
+      return s;
+    }
+    private static readonly RAST._IEnumCase theDefault = create(Dafny.Sequence<Dafny.Rune>.Empty, RAST.Formals.Default());
+    public static RAST._IEnumCase Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<RAST._IEnumCase> _TYPE = new Dafny.TypeDescriptor<RAST._IEnumCase>(RAST.EnumCase.Default());
+    public static Dafny.TypeDescriptor<RAST._IEnumCase> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IEnumCase create(Dafny.ISequence<Dafny.Rune> name, RAST._IFormals fields) {
+      return new EnumCase(name, fields);
+    }
+    public static _IEnumCase create_EnumCase(Dafny.ISequence<Dafny.Rune> name, RAST._IFormals fields) {
+      return create(name, fields);
+    }
+    public bool is_EnumCase { get { return true; } }
+    public Dafny.ISequence<Dafny.Rune> dtor_name {
+      get {
+        return this._name;
+      }
+    }
+    public RAST._IFormals dtor_fields {
+      get {
+        return this._fields;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind, bool newLine)
+    {
+      return Dafny.Sequence<Dafny.Rune>.Concat((this).dtor_name, ((this).dtor_fields)._ToString(ind, newLine));
+    }
+  }
+
+  public interface _IEnum {
+    bool is_Enum { get; }
+    Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_attributes { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
+    Dafny.ISequence<RAST._ITypeParam> dtor_typeParams { get; }
+    Dafny.ISequence<RAST._IEnumCase> dtor_variants { get; }
+    _IEnum DowncastClone();
+    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
+  }
+  public class Enum : _IEnum {
+    public readonly Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> _attributes;
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public readonly Dafny.ISequence<RAST._ITypeParam> _typeParams;
+    public readonly Dafny.ISequence<RAST._IEnumCase> _variants;
+    public Enum(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> attributes, Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<RAST._ITypeParam> typeParams, Dafny.ISequence<RAST._IEnumCase> variants) {
+      this._attributes = attributes;
+      this._name = name;
+      this._typeParams = typeParams;
+      this._variants = variants;
+    }
+    public _IEnum DowncastClone() {
+      if (this is _IEnum dt) { return dt; }
+      return new Enum(_attributes, _name, _typeParams, _variants);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Enum;
+      return oth != null && object.Equals(this._attributes, oth._attributes) && object.Equals(this._name, oth._name) && object.Equals(this._typeParams, oth._typeParams) && object.Equals(this._variants, oth._variants);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._attributes));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeParams));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._variants));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Enum.Enum";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._attributes);
+      s += ", ";
+      s += this._name.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._typeParams);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._variants);
+      s += ")";
+      return s;
+    }
+    private static readonly RAST._IEnum theDefault = create(Dafny.Sequence<Dafny.ISequence<Dafny.Rune>>.Empty, Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<RAST._ITypeParam>.Empty, Dafny.Sequence<RAST._IEnumCase>.Empty);
+    public static RAST._IEnum Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<RAST._IEnum> _TYPE = new Dafny.TypeDescriptor<RAST._IEnum>(RAST.Enum.Default());
+    public static Dafny.TypeDescriptor<RAST._IEnum> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IEnum create(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> attributes, Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<RAST._ITypeParam> typeParams, Dafny.ISequence<RAST._IEnumCase> variants) {
+      return new Enum(attributes, name, typeParams, variants);
+    }
+    public static _IEnum create_Enum(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> attributes, Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<RAST._ITypeParam> typeParams, Dafny.ISequence<RAST._IEnumCase> variants) {
+      return create(attributes, name, typeParams, variants);
+    }
+    public bool is_Enum { get { return true; } }
+    public Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> dtor_attributes {
+      get {
+        return this._attributes;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_name {
+      get {
+        return this._name;
+      }
+    }
+    public Dafny.ISequence<RAST._ITypeParam> dtor_typeParams {
+      get {
+        return this._typeParams;
+      }
+    }
+    public Dafny.ISequence<RAST._IEnumCase> dtor_variants {
+      get {
+        return this._variants;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
+      return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(RAST.Attribute.ToStringMultiple((this).dtor_attributes, ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("pub enum ")), (this).dtor_name), RAST.TypeParam.ToStringMultiple((this).dtor_typeParams, ind)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {")), RAST.__default.SeqToString<RAST._IEnumCase>((this).dtor_variants, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._IEnumCase, Dafny.ISequence<Dafny.Rune>>>>((_849_ind) => ((System.Func<RAST._IEnumCase, Dafny.ISequence<Dafny.Rune>>)((_850_variant) => {
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), _849_ind), RAST.__default.IND), (_850_variant)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_849_ind, RAST.__default.IND), false));
+      })))(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(","))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n")), ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
+    }
+  }
+
+  public interface _ITypeParam {
+    bool is_RawTypeParam { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_content { get; }
+    Dafny.ISequence<RAST._IType> dtor_constraints { get; }
+    _ITypeParam DowncastClone();
+    RAST._ITypeParam AddConstraints(Dafny.ISequence<RAST._IType> constraints);
+    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
+  }
+  public class TypeParam : _ITypeParam {
+    public readonly Dafny.ISequence<Dafny.Rune> _content;
+    public readonly Dafny.ISequence<RAST._IType> _constraints;
+    public TypeParam(Dafny.ISequence<Dafny.Rune> content, Dafny.ISequence<RAST._IType> constraints) {
+      this._content = content;
+      this._constraints = constraints;
+    }
+    public _ITypeParam DowncastClone() {
+      if (this is _ITypeParam dt) { return dt; }
+      return new TypeParam(_content, _constraints);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.TypeParam;
+      return oth != null && object.Equals(this._content, oth._content) && object.Equals(this._constraints, oth._constraints);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._content));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._constraints));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.TypeParam.RawTypeParam";
+      s += "(";
+      s += this._content.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._constraints);
+      s += ")";
+      return s;
+    }
+    private static readonly RAST._ITypeParam theDefault = create(Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<RAST._IType>.Empty);
+    public static RAST._ITypeParam Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<RAST._ITypeParam> _TYPE = new Dafny.TypeDescriptor<RAST._ITypeParam>(RAST.TypeParam.Default());
+    public static Dafny.TypeDescriptor<RAST._ITypeParam> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _ITypeParam create(Dafny.ISequence<Dafny.Rune> content, Dafny.ISequence<RAST._IType> constraints) {
+      return new TypeParam(content, constraints);
+    }
+    public static _ITypeParam create_RawTypeParam(Dafny.ISequence<Dafny.Rune> content, Dafny.ISequence<RAST._IType> constraints) {
+      return create(content, constraints);
+    }
+    public bool is_RawTypeParam { get { return true; } }
+    public Dafny.ISequence<Dafny.Rune> dtor_content {
+      get {
+        return this._content;
+      }
+    }
+    public Dafny.ISequence<RAST._IType> dtor_constraints {
+      get {
+        return this._constraints;
+      }
+    }
+    public static Dafny.ISequence<Dafny.Rune> ToStringMultiple(Dafny.ISequence<RAST._ITypeParam> typeParams, Dafny.ISequence<Dafny.Rune> ind)
+    {
+      if ((new BigInteger((typeParams).Count)).Sign == 0) {
+        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
+      } else {
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), RAST.__default.SeqToString<RAST._ITypeParam>(typeParams, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._ITypeParam, Dafny.ISequence<Dafny.Rune>>>>((_851_ind) => ((System.Func<RAST._ITypeParam, Dafny.ISequence<Dafny.Rune>>)((_852_t) => {
+          return (_852_t)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_851_ind, RAST.__default.IND));
+        })))(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">"));
+      }
+    }
+    public static Dafny.ISequence<RAST._ITypeParam> AddConstraintsMultiple(Dafny.ISequence<RAST._ITypeParam> typeParams, Dafny.ISequence<RAST._IType> constraints)
+    {
+      Dafny.ISequence<RAST._ITypeParam> _853___accumulator = Dafny.Sequence<RAST._ITypeParam>.FromElements();
+    TAIL_CALL_START: ;
+      if ((new BigInteger((typeParams).Count)).Sign == 0) {
+        return Dafny.Sequence<RAST._ITypeParam>.Concat(_853___accumulator, Dafny.Sequence<RAST._ITypeParam>.FromElements());
+      } else {
+        _853___accumulator = Dafny.Sequence<RAST._ITypeParam>.Concat(_853___accumulator, Dafny.Sequence<RAST._ITypeParam>.FromElements(((typeParams).Select(BigInteger.Zero)).AddConstraints(constraints)));
+        Dafny.ISequence<RAST._ITypeParam> _in111 = (typeParams).Drop(BigInteger.One);
+        Dafny.ISequence<RAST._IType> _in112 = constraints;
+        typeParams = _in111;
+        constraints = _in112;
+        goto TAIL_CALL_START;
+      }
+    }
+    public RAST._ITypeParam AddConstraints(Dafny.ISequence<RAST._IType> constraints) {
+      RAST._ITypeParam _854_dt__update__tmp_h0 = this;
+      Dafny.ISequence<RAST._IType> _855_dt__update_hconstraints_h0 = Dafny.Sequence<RAST._IType>.Concat((this).dtor_constraints, constraints);
+      return RAST.TypeParam.create((_854_dt__update__tmp_h0).dtor_content, _855_dt__update_hconstraints_h0);
+    }
+    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
+      return Dafny.Sequence<Dafny.Rune>.Concat((this).dtor_content, (((new BigInteger(((this).dtor_constraints).Count)).Sign == 0) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")) : (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(": "), RAST.__default.SeqToString<RAST._IType>((this).dtor_constraints, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._IType, Dafny.ISequence<Dafny.Rune>>>>((_856_ind) => ((System.Func<RAST._IType, Dafny.ISequence<Dafny.Rune>>)((_857_t) => {
+        return (_857_t)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_856_ind, RAST.__default.IND));
+      })))(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" + "))))));
+    }
+  }
+
+  public interface _IType {
+    bool is_SelfOwned { get; }
+    bool is_U8 { get; }
+    bool is_U16 { get; }
+    bool is_U32 { get; }
+    bool is_U64 { get; }
+    bool is_U128 { get; }
+    bool is_I8 { get; }
+    bool is_I16 { get; }
+    bool is_I32 { get; }
+    bool is_I64 { get; }
+    bool is_I128 { get; }
+    bool is_TIdentifier { get; }
+    bool is_TMemberSelect { get; }
+    bool is_TypeApp { get; }
+    bool is_Borrowed { get; }
+    bool is_BorrowedMut { get; }
+    bool is_ImplType { get; }
+    bool is_DynType { get; }
+    bool is_TupleType { get; }
+    bool is_FnType { get; }
+    bool is_IntersectionType { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
+    RAST._IType dtor_base { get; }
+    RAST._IType dtor_baseName { get; }
+    Dafny.ISequence<RAST._IType> dtor_arguments { get; }
+    RAST._IType dtor_underlying { get; }
+    RAST._IType dtor_returnType { get; }
+    RAST._IType dtor_left { get; }
+    RAST._IType dtor_right { get; }
+    _IType DowncastClone();
+    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
+    RAST._IType MSel(Dafny.ISequence<Dafny.Rune> name);
+    RAST._IType Apply1(RAST._IType arg);
+  }
+  public abstract class Type : _IType {
+    public Type() {
+    }
+    private static readonly RAST._IType theDefault = create_SelfOwned();
+    public static RAST._IType Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<RAST._IType> _TYPE = new Dafny.TypeDescriptor<RAST._IType>(RAST.Type.Default());
+    public static Dafny.TypeDescriptor<RAST._IType> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IType create_SelfOwned() {
+      return new Type_SelfOwned();
+    }
+    public static _IType create_U8() {
+      return new Type_U8();
+    }
+    public static _IType create_U16() {
+      return new Type_U16();
+    }
+    public static _IType create_U32() {
+      return new Type_U32();
+    }
+    public static _IType create_U64() {
+      return new Type_U64();
+    }
+    public static _IType create_U128() {
+      return new Type_U128();
+    }
+    public static _IType create_I8() {
+      return new Type_I8();
+    }
+    public static _IType create_I16() {
+      return new Type_I16();
+    }
+    public static _IType create_I32() {
+      return new Type_I32();
+    }
+    public static _IType create_I64() {
+      return new Type_I64();
+    }
+    public static _IType create_I128() {
+      return new Type_I128();
+    }
+    public static _IType create_TIdentifier(Dafny.ISequence<Dafny.Rune> name) {
+      return new Type_TIdentifier(name);
+    }
+    public static _IType create_TMemberSelect(RAST._IType @base, Dafny.ISequence<Dafny.Rune> name) {
+      return new Type_TMemberSelect(@base, name);
+    }
+    public static _IType create_TypeApp(RAST._IType baseName, Dafny.ISequence<RAST._IType> arguments) {
+      return new Type_TypeApp(baseName, arguments);
+    }
+    public static _IType create_Borrowed(RAST._IType underlying) {
+      return new Type_Borrowed(underlying);
+    }
+    public static _IType create_BorrowedMut(RAST._IType underlying) {
+      return new Type_BorrowedMut(underlying);
+    }
+    public static _IType create_ImplType(RAST._IType underlying) {
+      return new Type_ImplType(underlying);
+    }
+    public static _IType create_DynType(RAST._IType underlying) {
+      return new Type_DynType(underlying);
+    }
+    public static _IType create_TupleType(Dafny.ISequence<RAST._IType> arguments) {
+      return new Type_TupleType(arguments);
+    }
+    public static _IType create_FnType(Dafny.ISequence<RAST._IType> arguments, RAST._IType returnType) {
+      return new Type_FnType(arguments, returnType);
+    }
+    public static _IType create_IntersectionType(RAST._IType left, RAST._IType right) {
+      return new Type_IntersectionType(left, right);
+    }
+    public bool is_SelfOwned { get { return this is Type_SelfOwned; } }
+    public bool is_U8 { get { return this is Type_U8; } }
+    public bool is_U16 { get { return this is Type_U16; } }
+    public bool is_U32 { get { return this is Type_U32; } }
+    public bool is_U64 { get { return this is Type_U64; } }
+    public bool is_U128 { get { return this is Type_U128; } }
+    public bool is_I8 { get { return this is Type_I8; } }
+    public bool is_I16 { get { return this is Type_I16; } }
+    public bool is_I32 { get { return this is Type_I32; } }
+    public bool is_I64 { get { return this is Type_I64; } }
+    public bool is_I128 { get { return this is Type_I128; } }
+    public bool is_TIdentifier { get { return this is Type_TIdentifier; } }
+    public bool is_TMemberSelect { get { return this is Type_TMemberSelect; } }
+    public bool is_TypeApp { get { return this is Type_TypeApp; } }
+    public bool is_Borrowed { get { return this is Type_Borrowed; } }
+    public bool is_BorrowedMut { get { return this is Type_BorrowedMut; } }
+    public bool is_ImplType { get { return this is Type_ImplType; } }
+    public bool is_DynType { get { return this is Type_DynType; } }
+    public bool is_TupleType { get { return this is Type_TupleType; } }
+    public bool is_FnType { get { return this is Type_FnType; } }
+    public bool is_IntersectionType { get { return this is Type_IntersectionType; } }
+    public Dafny.ISequence<Dafny.Rune> dtor_name {
+      get {
+        var d = this;
+        if (d is Type_TIdentifier) { return ((Type_TIdentifier)d)._name; }
+        return ((Type_TMemberSelect)d)._name;
+      }
+    }
+    public RAST._IType dtor_base {
+      get {
+        var d = this;
+        return ((Type_TMemberSelect)d)._base;
+      }
+    }
+    public RAST._IType dtor_baseName {
+      get {
+        var d = this;
+        return ((Type_TypeApp)d)._baseName;
+      }
+    }
+    public Dafny.ISequence<RAST._IType> dtor_arguments {
+      get {
+        var d = this;
+        if (d is Type_TypeApp) { return ((Type_TypeApp)d)._arguments; }
+        if (d is Type_TupleType) { return ((Type_TupleType)d)._arguments; }
+        return ((Type_FnType)d)._arguments;
+      }
+    }
+    public RAST._IType dtor_underlying {
+      get {
+        var d = this;
+        if (d is Type_Borrowed) { return ((Type_Borrowed)d)._underlying; }
+        if (d is Type_BorrowedMut) { return ((Type_BorrowedMut)d)._underlying; }
+        if (d is Type_ImplType) { return ((Type_ImplType)d)._underlying; }
+        return ((Type_DynType)d)._underlying;
+      }
+    }
+    public RAST._IType dtor_returnType {
+      get {
+        var d = this;
+        return ((Type_FnType)d)._returnType;
+      }
+    }
+    public RAST._IType dtor_left {
+      get {
+        var d = this;
+        return ((Type_IntersectionType)d)._left;
+      }
+    }
+    public RAST._IType dtor_right {
+      get {
+        var d = this;
+        return ((Type_IntersectionType)d)._right;
+      }
+    }
+    public abstract _IType DowncastClone();
+    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
+      RAST._IType _source26 = this;
+      if (_source26.is_SelfOwned) {
+        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Self");
+      } else if (_source26.is_U8) {
+        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("u8");
+      } else if (_source26.is_U16) {
+        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("u16");
+      } else if (_source26.is_U32) {
+        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("u32");
+      } else if (_source26.is_U64) {
+        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("u64");
+      } else if (_source26.is_U128) {
+        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("u128");
+      } else if (_source26.is_I8) {
+        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("i8");
+      } else if (_source26.is_I16) {
+        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("i16");
+      } else if (_source26.is_I32) {
+        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("i32");
+      } else if (_source26.is_I64) {
+        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("i64");
+      } else if (_source26.is_I128) {
+        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("i128");
+      } else if (_source26.is_TIdentifier) {
+        Dafny.ISequence<Dafny.Rune> _858___mcc_h0 = _source26.dtor_name;
+        Dafny.ISequence<Dafny.Rune> _859_underlying = _858___mcc_h0;
+        return _859_underlying;
+      } else if (_source26.is_TMemberSelect) {
+        RAST._IType _860___mcc_h1 = _source26.dtor_base;
+        Dafny.ISequence<Dafny.Rune> _861___mcc_h2 = _source26.dtor_name;
+        Dafny.ISequence<Dafny.Rune> _862_name = _861___mcc_h2;
+        RAST._IType _863_underlying = _860___mcc_h1;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat((_863_underlying)._ToString(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::")), _862_name);
+      } else if (_source26.is_TypeApp) {
+        RAST._IType _864___mcc_h3 = _source26.dtor_baseName;
+        Dafny.ISequence<RAST._IType> _865___mcc_h4 = _source26.dtor_arguments;
+        Dafny.ISequence<RAST._IType> _866_args = _865___mcc_h4;
+        RAST._IType _867_base = _864___mcc_h3;
+        return Dafny.Sequence<Dafny.Rune>.Concat((_867_base)._ToString(ind), (((_866_args).Equals(Dafny.Sequence<RAST._IType>.FromElements())) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")) : (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"), RAST.__default.SeqToString<RAST._IType>(_866_args, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._IType, Dafny.ISequence<Dafny.Rune>>>>((_868_ind) => ((System.Func<RAST._IType, Dafny.ISequence<Dafny.Rune>>)((_869_arg) => {
+          return (_869_arg)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_868_ind, RAST.__default.IND));
+        })))(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">")))));
+      } else if (_source26.is_Borrowed) {
+        RAST._IType _870___mcc_h5 = _source26.dtor_underlying;
+        RAST._IType _871_underlying = _870___mcc_h5;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), (_871_underlying)._ToString(ind));
+      } else if (_source26.is_BorrowedMut) {
+        RAST._IType _872___mcc_h6 = _source26.dtor_underlying;
+        RAST._IType _873_underlying = _872___mcc_h6;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&mut "), (_873_underlying)._ToString(ind));
+      } else if (_source26.is_ImplType) {
+        RAST._IType _874___mcc_h7 = _source26.dtor_underlying;
+        RAST._IType _875_underlying = _874___mcc_h7;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("impl "), (_875_underlying)._ToString(ind));
+      } else if (_source26.is_DynType) {
+        RAST._IType _876___mcc_h8 = _source26.dtor_underlying;
+        RAST._IType _877_underlying = _876___mcc_h8;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("dyn "), (_877_underlying)._ToString(ind));
+      } else if (_source26.is_TupleType) {
+        Dafny.ISequence<RAST._IType> _878___mcc_h9 = _source26.dtor_arguments;
+        Dafny.ISequence<RAST._IType> _879_args = _878___mcc_h9;
+        if ((_879_args).Equals(Dafny.Sequence<RAST._IType>.FromElements())) {
+          return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("()");
+        } else {
+          return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), RAST.__default.SeqToString<RAST._IType>(_879_args, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._IType, Dafny.ISequence<Dafny.Rune>>>>((_880_ind) => ((System.Func<RAST._IType, Dafny.ISequence<Dafny.Rune>>)((_881_arg) => {
+            return (_881_arg)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_880_ind, RAST.__default.IND));
+          })))(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
+        }
+      } else if (_source26.is_FnType) {
+        Dafny.ISequence<RAST._IType> _882___mcc_h10 = _source26.dtor_arguments;
+        RAST._IType _883___mcc_h11 = _source26.dtor_returnType;
+        RAST._IType _884_returnType = _883___mcc_h11;
+        Dafny.ISequence<RAST._IType> _885_arguments = _882___mcc_h10;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::std::ops::Fn("), RAST.__default.SeqToString<RAST._IType>(_885_arguments, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._IType, Dafny.ISequence<Dafny.Rune>>>>((_886_ind) => ((System.Func<RAST._IType, Dafny.ISequence<Dafny.Rune>>)((_887_arg) => {
+          return (_887_arg)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_886_ind, RAST.__default.IND));
+        })))(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(") -> ")), (_884_returnType)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND)));
+      } else {
+        RAST._IType _888___mcc_h12 = _source26.dtor_left;
+        RAST._IType _889___mcc_h13 = _source26.dtor_right;
+        RAST._IType _890_right = _889___mcc_h13;
+        RAST._IType _891_left = _888___mcc_h12;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat((_891_left)._ToString(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" + ")), (_890_right)._ToString(ind));
+      }
+    }
+    public RAST._IType MSel(Dafny.ISequence<Dafny.Rune> name) {
+      return RAST.Type.create_TMemberSelect(this, name);
+    }
+    public RAST._IType Apply1(RAST._IType arg) {
+      return RAST.Type.create_TypeApp(this, Dafny.Sequence<RAST._IType>.FromElements(arg));
+    }
+  }
+  public class Type_SelfOwned : Type {
+    public Type_SelfOwned() : base() {
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_SelfOwned();
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Type_SelfOwned;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Type.SelfOwned";
+      return s;
+    }
+  }
+  public class Type_U8 : Type {
+    public Type_U8() : base() {
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_U8();
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Type_U8;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Type.U8";
+      return s;
+    }
+  }
+  public class Type_U16 : Type {
+    public Type_U16() : base() {
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_U16();
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Type_U16;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 2;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Type.U16";
+      return s;
+    }
+  }
+  public class Type_U32 : Type {
+    public Type_U32() : base() {
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_U32();
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Type_U32;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 3;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Type.U32";
+      return s;
+    }
+  }
+  public class Type_U64 : Type {
+    public Type_U64() : base() {
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_U64();
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Type_U64;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 4;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Type.U64";
+      return s;
+    }
+  }
+  public class Type_U128 : Type {
+    public Type_U128() : base() {
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_U128();
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Type_U128;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 5;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Type.U128";
+      return s;
+    }
+  }
+  public class Type_I8 : Type {
+    public Type_I8() : base() {
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_I8();
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Type_I8;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 6;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Type.I8";
+      return s;
+    }
+  }
+  public class Type_I16 : Type {
+    public Type_I16() : base() {
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_I16();
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Type_I16;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 7;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Type.I16";
+      return s;
+    }
+  }
+  public class Type_I32 : Type {
+    public Type_I32() : base() {
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_I32();
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Type_I32;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 8;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Type.I32";
+      return s;
+    }
+  }
+  public class Type_I64 : Type {
+    public Type_I64() : base() {
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_I64();
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Type_I64;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 9;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Type.I64";
+      return s;
+    }
+  }
+  public class Type_I128 : Type {
+    public Type_I128() : base() {
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_I128();
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Type_I128;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 10;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Type.I128";
+      return s;
+    }
+  }
+  public class Type_TIdentifier : Type {
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public Type_TIdentifier(Dafny.ISequence<Dafny.Rune> name) : base() {
+      this._name = name;
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_TIdentifier(_name);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Type_TIdentifier;
+      return oth != null && object.Equals(this._name, oth._name);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 11;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Type.TIdentifier";
+      s += "(";
+      s += this._name.ToVerbatimString(true);
+      s += ")";
+      return s;
+    }
+  }
+  public class Type_TMemberSelect : Type {
+    public readonly RAST._IType _base;
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public Type_TMemberSelect(RAST._IType @base, Dafny.ISequence<Dafny.Rune> name) : base() {
+      this._base = @base;
+      this._name = name;
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_TMemberSelect(_base, _name);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Type_TMemberSelect;
+      return oth != null && object.Equals(this._base, oth._base) && object.Equals(this._name, oth._name);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 12;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._base));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Type.TMemberSelect";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._base);
+      s += ", ";
+      s += this._name.ToVerbatimString(true);
+      s += ")";
+      return s;
+    }
+  }
+  public class Type_TypeApp : Type {
+    public readonly RAST._IType _baseName;
+    public readonly Dafny.ISequence<RAST._IType> _arguments;
+    public Type_TypeApp(RAST._IType baseName, Dafny.ISequence<RAST._IType> arguments) : base() {
+      this._baseName = baseName;
+      this._arguments = arguments;
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_TypeApp(_baseName, _arguments);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Type_TypeApp;
+      return oth != null && object.Equals(this._baseName, oth._baseName) && object.Equals(this._arguments, oth._arguments);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 13;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._baseName));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._arguments));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Type.TypeApp";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._baseName);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._arguments);
+      s += ")";
+      return s;
+    }
+  }
+  public class Type_Borrowed : Type {
+    public readonly RAST._IType _underlying;
+    public Type_Borrowed(RAST._IType underlying) : base() {
+      this._underlying = underlying;
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_Borrowed(_underlying);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Type_Borrowed;
+      return oth != null && object.Equals(this._underlying, oth._underlying);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 14;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._underlying));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Type.Borrowed";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._underlying);
+      s += ")";
+      return s;
+    }
+  }
+  public class Type_BorrowedMut : Type {
+    public readonly RAST._IType _underlying;
+    public Type_BorrowedMut(RAST._IType underlying) : base() {
+      this._underlying = underlying;
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_BorrowedMut(_underlying);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Type_BorrowedMut;
+      return oth != null && object.Equals(this._underlying, oth._underlying);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 15;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._underlying));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Type.BorrowedMut";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._underlying);
+      s += ")";
+      return s;
+    }
+  }
+  public class Type_ImplType : Type {
+    public readonly RAST._IType _underlying;
+    public Type_ImplType(RAST._IType underlying) : base() {
+      this._underlying = underlying;
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_ImplType(_underlying);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Type_ImplType;
+      return oth != null && object.Equals(this._underlying, oth._underlying);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 16;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._underlying));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Type.ImplType";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._underlying);
+      s += ")";
+      return s;
+    }
+  }
+  public class Type_DynType : Type {
+    public readonly RAST._IType _underlying;
+    public Type_DynType(RAST._IType underlying) : base() {
+      this._underlying = underlying;
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_DynType(_underlying);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Type_DynType;
+      return oth != null && object.Equals(this._underlying, oth._underlying);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 17;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._underlying));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Type.DynType";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._underlying);
+      s += ")";
+      return s;
+    }
+  }
+  public class Type_TupleType : Type {
+    public readonly Dafny.ISequence<RAST._IType> _arguments;
+    public Type_TupleType(Dafny.ISequence<RAST._IType> arguments) : base() {
+      this._arguments = arguments;
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_TupleType(_arguments);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Type_TupleType;
+      return oth != null && object.Equals(this._arguments, oth._arguments);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 18;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._arguments));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Type.TupleType";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._arguments);
+      s += ")";
+      return s;
+    }
+  }
+  public class Type_FnType : Type {
+    public readonly Dafny.ISequence<RAST._IType> _arguments;
+    public readonly RAST._IType _returnType;
+    public Type_FnType(Dafny.ISequence<RAST._IType> arguments, RAST._IType returnType) : base() {
+      this._arguments = arguments;
+      this._returnType = returnType;
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_FnType(_arguments, _returnType);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Type_FnType;
+      return oth != null && object.Equals(this._arguments, oth._arguments) && object.Equals(this._returnType, oth._returnType);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 19;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._arguments));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._returnType));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Type.FnType";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._arguments);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._returnType);
+      s += ")";
+      return s;
+    }
+  }
+  public class Type_IntersectionType : Type {
+    public readonly RAST._IType _left;
+    public readonly RAST._IType _right;
+    public Type_IntersectionType(RAST._IType left, RAST._IType right) : base() {
+      this._left = left;
+      this._right = right;
+    }
+    public override _IType DowncastClone() {
+      if (this is _IType dt) { return dt; }
+      return new Type_IntersectionType(_left, _right);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Type_IntersectionType;
+      return oth != null && object.Equals(this._left, oth._left) && object.Equals(this._right, oth._right);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 20;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._left));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._right));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Type.IntersectionType";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._left);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._right);
+      s += ")";
+      return s;
+    }
+  }
+
+  public interface _ITrait {
+    bool is_Trait { get; }
+    Dafny.ISequence<RAST._ITypeParam> dtor_typeParams { get; }
+    RAST._IType dtor_tpe { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_where { get; }
+    Dafny.ISequence<RAST._IImplMember> dtor_body { get; }
+    _ITrait DowncastClone();
+    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
+  }
+  public class Trait : _ITrait {
+    public readonly Dafny.ISequence<RAST._ITypeParam> _typeParams;
+    public readonly RAST._IType _tpe;
+    public readonly Dafny.ISequence<Dafny.Rune> _where;
+    public readonly Dafny.ISequence<RAST._IImplMember> _body;
+    public Trait(Dafny.ISequence<RAST._ITypeParam> typeParams, RAST._IType tpe, Dafny.ISequence<Dafny.Rune> @where, Dafny.ISequence<RAST._IImplMember> body) {
+      this._typeParams = typeParams;
+      this._tpe = tpe;
+      this._where = @where;
+      this._body = body;
+    }
+    public _ITrait DowncastClone() {
+      if (this is _ITrait dt) { return dt; }
+      return new Trait(_typeParams, _tpe, _where, _body);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Trait;
+      return oth != null && object.Equals(this._typeParams, oth._typeParams) && object.Equals(this._tpe, oth._tpe) && object.Equals(this._where, oth._where) && object.Equals(this._body, oth._body);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeParams));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._tpe));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._where));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Trait.Trait";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._typeParams);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._tpe);
+      s += ", ";
+      s += this._where.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._body);
+      s += ")";
+      return s;
+    }
+    private static readonly RAST._ITrait theDefault = create(Dafny.Sequence<RAST._ITypeParam>.Empty, RAST.Type.Default(), Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<RAST._IImplMember>.Empty);
+    public static RAST._ITrait Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<RAST._ITrait> _TYPE = new Dafny.TypeDescriptor<RAST._ITrait>(RAST.Trait.Default());
+    public static Dafny.TypeDescriptor<RAST._ITrait> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _ITrait create(Dafny.ISequence<RAST._ITypeParam> typeParams, RAST._IType tpe, Dafny.ISequence<Dafny.Rune> @where, Dafny.ISequence<RAST._IImplMember> body) {
+      return new Trait(typeParams, tpe, @where, body);
+    }
+    public static _ITrait create_Trait(Dafny.ISequence<RAST._ITypeParam> typeParams, RAST._IType tpe, Dafny.ISequence<Dafny.Rune> @where, Dafny.ISequence<RAST._IImplMember> body) {
+      return create(typeParams, tpe, @where, body);
+    }
+    public bool is_Trait { get { return true; } }
+    public Dafny.ISequence<RAST._ITypeParam> dtor_typeParams {
+      get {
+        return this._typeParams;
+      }
+    }
+    public RAST._IType dtor_tpe {
+      get {
+        return this._tpe;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_where {
+      get {
+        return this._where;
+      }
+    }
+    public Dafny.ISequence<RAST._IImplMember> dtor_body {
+      get {
+        return this._body;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
+      return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("trait "), RAST.TypeParam.ToStringMultiple((this).dtor_typeParams, ind)), ((this).dtor_tpe)._ToString(ind)), ((!((this).dtor_where).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))) ? (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), ind), RAST.__default.IND), (this).dtor_where)) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {")), RAST.__default.SeqToString<RAST._IImplMember>((this).dtor_body, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._IImplMember, Dafny.ISequence<Dafny.Rune>>>>((_892_ind) => ((System.Func<RAST._IImplMember, Dafny.ISequence<Dafny.Rune>>)((_893_member) => {
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), _892_ind), RAST.__default.IND), (_893_member)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_892_ind, RAST.__default.IND)));
+      })))(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))), (((new BigInteger(((this).dtor_body).Count)).Sign == 0) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")) : (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), ind)))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
+    }
+  }
+
+  public interface _IImpl {
+    bool is_ImplFor { get; }
+    bool is_Impl { get; }
+    Dafny.ISequence<RAST._ITypeParam> dtor_typeParams { get; }
+    RAST._IType dtor_tpe { get; }
+    RAST._IType dtor_forType { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_where { get; }
+    Dafny.ISequence<RAST._IImplMember> dtor_body { get; }
+    _IImpl DowncastClone();
+    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
+  }
+  public abstract class Impl : _IImpl {
+    public Impl() {
+    }
+    private static readonly RAST._IImpl theDefault = create_ImplFor(Dafny.Sequence<RAST._ITypeParam>.Empty, RAST.Type.Default(), RAST.Type.Default(), Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<RAST._IImplMember>.Empty);
+    public static RAST._IImpl Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<RAST._IImpl> _TYPE = new Dafny.TypeDescriptor<RAST._IImpl>(RAST.Impl.Default());
+    public static Dafny.TypeDescriptor<RAST._IImpl> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IImpl create_ImplFor(Dafny.ISequence<RAST._ITypeParam> typeParams, RAST._IType tpe, RAST._IType forType, Dafny.ISequence<Dafny.Rune> @where, Dafny.ISequence<RAST._IImplMember> body) {
+      return new Impl_ImplFor(typeParams, tpe, forType, @where, body);
+    }
+    public static _IImpl create_Impl(Dafny.ISequence<RAST._ITypeParam> typeParams, RAST._IType tpe, Dafny.ISequence<Dafny.Rune> @where, Dafny.ISequence<RAST._IImplMember> body) {
+      return new Impl_Impl(typeParams, tpe, @where, body);
+    }
+    public bool is_ImplFor { get { return this is Impl_ImplFor; } }
+    public bool is_Impl { get { return this is Impl_Impl; } }
+    public Dafny.ISequence<RAST._ITypeParam> dtor_typeParams {
+      get {
+        var d = this;
+        if (d is Impl_ImplFor) { return ((Impl_ImplFor)d)._typeParams; }
+        return ((Impl_Impl)d)._typeParams;
+      }
+    }
+    public RAST._IType dtor_tpe {
+      get {
+        var d = this;
+        if (d is Impl_ImplFor) { return ((Impl_ImplFor)d)._tpe; }
+        return ((Impl_Impl)d)._tpe;
+      }
+    }
+    public RAST._IType dtor_forType {
+      get {
+        var d = this;
+        return ((Impl_ImplFor)d)._forType;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_where {
+      get {
+        var d = this;
+        if (d is Impl_ImplFor) { return ((Impl_ImplFor)d)._where; }
+        return ((Impl_Impl)d)._where;
+      }
+    }
+    public Dafny.ISequence<RAST._IImplMember> dtor_body {
+      get {
+        var d = this;
+        if (d is Impl_ImplFor) { return ((Impl_ImplFor)d)._body; }
+        return ((Impl_Impl)d)._body;
+      }
+    }
+    public abstract _IImpl DowncastClone();
+    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
+      return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("impl "), RAST.TypeParam.ToStringMultiple((this).dtor_typeParams, ind)), ((this).dtor_tpe)._ToString(ind)), (((this).is_ImplFor) ? (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" for "), ((this).dtor_forType)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND)))) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")))), ((!((this).dtor_where).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))) ? (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), ind), RAST.__default.IND), (this).dtor_where)) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {")), RAST.__default.SeqToString<RAST._IImplMember>((this).dtor_body, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._IImplMember, Dafny.ISequence<Dafny.Rune>>>>((_894_ind) => ((System.Func<RAST._IImplMember, Dafny.ISequence<Dafny.Rune>>)((_895_member) => {
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), _894_ind), RAST.__default.IND), (_895_member)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_894_ind, RAST.__default.IND)));
+      })))(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))), (((new BigInteger(((this).dtor_body).Count)).Sign == 0) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")) : (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), ind)))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
+    }
+  }
+  public class Impl_ImplFor : Impl {
+    public readonly Dafny.ISequence<RAST._ITypeParam> _typeParams;
+    public readonly RAST._IType _tpe;
+    public readonly RAST._IType _forType;
+    public readonly Dafny.ISequence<Dafny.Rune> _where;
+    public readonly Dafny.ISequence<RAST._IImplMember> _body;
+    public Impl_ImplFor(Dafny.ISequence<RAST._ITypeParam> typeParams, RAST._IType tpe, RAST._IType forType, Dafny.ISequence<Dafny.Rune> @where, Dafny.ISequence<RAST._IImplMember> body) : base() {
+      this._typeParams = typeParams;
+      this._tpe = tpe;
+      this._forType = forType;
+      this._where = @where;
+      this._body = body;
+    }
+    public override _IImpl DowncastClone() {
+      if (this is _IImpl dt) { return dt; }
+      return new Impl_ImplFor(_typeParams, _tpe, _forType, _where, _body);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Impl_ImplFor;
+      return oth != null && object.Equals(this._typeParams, oth._typeParams) && object.Equals(this._tpe, oth._tpe) && object.Equals(this._forType, oth._forType) && object.Equals(this._where, oth._where) && object.Equals(this._body, oth._body);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeParams));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._tpe));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._forType));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._where));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Impl.ImplFor";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._typeParams);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._tpe);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._forType);
+      s += ", ";
+      s += this._where.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._body);
+      s += ")";
+      return s;
+    }
+  }
+  public class Impl_Impl : Impl {
+    public readonly Dafny.ISequence<RAST._ITypeParam> _typeParams;
+    public readonly RAST._IType _tpe;
+    public readonly Dafny.ISequence<Dafny.Rune> _where;
+    public readonly Dafny.ISequence<RAST._IImplMember> _body;
+    public Impl_Impl(Dafny.ISequence<RAST._ITypeParam> typeParams, RAST._IType tpe, Dafny.ISequence<Dafny.Rune> @where, Dafny.ISequence<RAST._IImplMember> body) : base() {
+      this._typeParams = typeParams;
+      this._tpe = tpe;
+      this._where = @where;
+      this._body = body;
+    }
+    public override _IImpl DowncastClone() {
+      if (this is _IImpl dt) { return dt; }
+      return new Impl_Impl(_typeParams, _tpe, _where, _body);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Impl_Impl;
+      return oth != null && object.Equals(this._typeParams, oth._typeParams) && object.Equals(this._tpe, oth._tpe) && object.Equals(this._where, oth._where) && object.Equals(this._body, oth._body);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeParams));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._tpe));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._where));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Impl.Impl";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._typeParams);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._tpe);
+      s += ", ";
+      s += this._where.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._body);
+      s += ")";
+      return s;
+    }
+  }
+
+  public interface _IImplMember {
+    bool is_RawImplMember { get; }
+    bool is_FnDecl { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_content { get; }
+    RAST._IVisibility dtor_pub { get; }
+    RAST._IFn dtor_fun { get; }
+    _IImplMember DowncastClone();
+    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
+  }
+  public abstract class ImplMember : _IImplMember {
+    public ImplMember() {
+    }
+    private static readonly RAST._IImplMember theDefault = create_RawImplMember(Dafny.Sequence<Dafny.Rune>.Empty);
+    public static RAST._IImplMember Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<RAST._IImplMember> _TYPE = new Dafny.TypeDescriptor<RAST._IImplMember>(RAST.ImplMember.Default());
+    public static Dafny.TypeDescriptor<RAST._IImplMember> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IImplMember create_RawImplMember(Dafny.ISequence<Dafny.Rune> content) {
+      return new ImplMember_RawImplMember(content);
+    }
+    public static _IImplMember create_FnDecl(RAST._IVisibility pub, RAST._IFn fun) {
+      return new ImplMember_FnDecl(pub, fun);
+    }
+    public bool is_RawImplMember { get { return this is ImplMember_RawImplMember; } }
+    public bool is_FnDecl { get { return this is ImplMember_FnDecl; } }
+    public Dafny.ISequence<Dafny.Rune> dtor_content {
+      get {
+        var d = this;
+        return ((ImplMember_RawImplMember)d)._content;
+      }
+    }
+    public RAST._IVisibility dtor_pub {
+      get {
+        var d = this;
+        return ((ImplMember_FnDecl)d)._pub;
+      }
+    }
+    public RAST._IFn dtor_fun {
+      get {
+        var d = this;
+        return ((ImplMember_FnDecl)d)._fun;
+      }
+    }
+    public abstract _IImplMember DowncastClone();
+    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
+      if ((this).is_FnDecl) {
+        return Dafny.Sequence<Dafny.Rune>.Concat(((object.Equals((this).dtor_pub, RAST.Visibility.create_PUB())) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("pub ")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))), ((this).dtor_fun)._ToString(ind));
+      } else {
+        return (this).dtor_content;
+      }
+    }
+  }
+  public class ImplMember_RawImplMember : ImplMember {
+    public readonly Dafny.ISequence<Dafny.Rune> _content;
+    public ImplMember_RawImplMember(Dafny.ISequence<Dafny.Rune> content) : base() {
+      this._content = content;
+    }
+    public override _IImplMember DowncastClone() {
+      if (this is _IImplMember dt) { return dt; }
+      return new ImplMember_RawImplMember(_content);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.ImplMember_RawImplMember;
+      return oth != null && object.Equals(this._content, oth._content);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._content));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.ImplMember.RawImplMember";
+      s += "(";
+      s += this._content.ToVerbatimString(true);
+      s += ")";
+      return s;
+    }
+  }
+  public class ImplMember_FnDecl : ImplMember {
+    public readonly RAST._IVisibility _pub;
+    public readonly RAST._IFn _fun;
+    public ImplMember_FnDecl(RAST._IVisibility pub, RAST._IFn fun) : base() {
+      this._pub = pub;
+      this._fun = fun;
+    }
+    public override _IImplMember DowncastClone() {
+      if (this is _IImplMember dt) { return dt; }
+      return new ImplMember_FnDecl(_pub, _fun);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.ImplMember_FnDecl;
+      return oth != null && object.Equals(this._pub, oth._pub) && object.Equals(this._fun, oth._fun);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._pub));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._fun));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.ImplMember.FnDecl";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._pub);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._fun);
+      s += ")";
+      return s;
+    }
+  }
+
+  public interface _IVisibility {
+    bool is_PUB { get; }
+    bool is_PRIV { get; }
+    _IVisibility DowncastClone();
+  }
+  public abstract class Visibility : _IVisibility {
+    public Visibility() {
+    }
+    private static readonly RAST._IVisibility theDefault = create_PUB();
+    public static RAST._IVisibility Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<RAST._IVisibility> _TYPE = new Dafny.TypeDescriptor<RAST._IVisibility>(RAST.Visibility.Default());
+    public static Dafny.TypeDescriptor<RAST._IVisibility> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IVisibility create_PUB() {
+      return new Visibility_PUB();
+    }
+    public static _IVisibility create_PRIV() {
+      return new Visibility_PRIV();
+    }
+    public bool is_PUB { get { return this is Visibility_PUB; } }
+    public bool is_PRIV { get { return this is Visibility_PRIV; } }
+    public static System.Collections.Generic.IEnumerable<_IVisibility> AllSingletonConstructors {
+      get {
+        yield return Visibility.create_PUB();
+        yield return Visibility.create_PRIV();
+      }
+    }
+    public abstract _IVisibility DowncastClone();
+  }
+  public class Visibility_PUB : Visibility {
+    public Visibility_PUB() : base() {
+    }
+    public override _IVisibility DowncastClone() {
+      if (this is _IVisibility dt) { return dt; }
+      return new Visibility_PUB();
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Visibility_PUB;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Visibility.PUB";
+      return s;
+    }
+  }
+  public class Visibility_PRIV : Visibility {
+    public Visibility_PRIV() : base() {
+    }
+    public override _IVisibility DowncastClone() {
+      if (this is _IVisibility dt) { return dt; }
+      return new Visibility_PRIV();
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Visibility_PRIV;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Visibility.PRIV";
+      return s;
+    }
+  }
+
+  public interface _IFormal {
+    bool is_Formal { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
+    RAST._IType dtor_tpe { get; }
+    _IFormal DowncastClone();
+    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
+  }
+  public class Formal : _IFormal {
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public readonly RAST._IType _tpe;
+    public Formal(Dafny.ISequence<Dafny.Rune> name, RAST._IType tpe) {
+      this._name = name;
+      this._tpe = tpe;
+    }
+    public _IFormal DowncastClone() {
+      if (this is _IFormal dt) { return dt; }
+      return new Formal(_name, _tpe);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Formal;
+      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._tpe, oth._tpe);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._tpe));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Formal.Formal";
+      s += "(";
+      s += this._name.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._tpe);
+      s += ")";
+      return s;
+    }
+    private static readonly RAST._IFormal theDefault = create(Dafny.Sequence<Dafny.Rune>.Empty, RAST.Type.Default());
+    public static RAST._IFormal Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<RAST._IFormal> _TYPE = new Dafny.TypeDescriptor<RAST._IFormal>(RAST.Formal.Default());
+    public static Dafny.TypeDescriptor<RAST._IFormal> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IFormal create(Dafny.ISequence<Dafny.Rune> name, RAST._IType tpe) {
+      return new Formal(name, tpe);
+    }
+    public static _IFormal create_Formal(Dafny.ISequence<Dafny.Rune> name, RAST._IType tpe) {
+      return create(name, tpe);
+    }
+    public bool is_Formal { get { return true; } }
+    public Dafny.ISequence<Dafny.Rune> dtor_name {
+      get {
+        return this._name;
+      }
+    }
+    public RAST._IType dtor_tpe {
+      get {
+        return this._tpe;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
+      if ((((this).dtor_name).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("self"))) && (((this).dtor_tpe).is_SelfOwned)) {
+        return (this).dtor_name;
+      } else if ((((this).dtor_name).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&self"))) && (object.Equals((this).dtor_tpe, RAST.Type.create_Borrowed(RAST.Type.create_SelfOwned())))) {
+        return (this).dtor_name;
+      } else if ((((this).dtor_name).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&mut self"))) && (object.Equals((this).dtor_tpe, RAST.Type.create_Borrowed(RAST.__default.SelfMut)))) {
+        return (this).dtor_name;
+      } else {
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat((this).dtor_name, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(": ")), ((this).dtor_tpe)._ToString(ind));
+      }
+    }
+    public static RAST._IFormal self { get {
+      return RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&self"), RAST.__default.Self);
+    } }
+    public static RAST._IFormal selfOwned { get {
+      return RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("self"), RAST.Type.create_SelfOwned());
+    } }
+    public static RAST._IFormal selfMut { get {
+      return RAST.Formal.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&mut self"), RAST.__default.SelfMut);
+    } }
+  }
+
+  public interface _IPattern {
+    bool is_RawPattern { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_content { get; }
+  }
+  public class Pattern : _IPattern {
+    public readonly Dafny.ISequence<Dafny.Rune> _content;
+    public Pattern(Dafny.ISequence<Dafny.Rune> content) {
+      this._content = content;
+    }
+    public static Dafny.ISequence<Dafny.Rune> DowncastClone(Dafny.ISequence<Dafny.Rune> _this) {
+      return _this;
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Pattern;
+      return oth != null && object.Equals(this._content, oth._content);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._content));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Pattern.RawPattern";
+      s += "(";
+      s += this._content.ToVerbatimString(true);
+      s += ")";
+      return s;
+    }
+    private static readonly Dafny.ISequence<Dafny.Rune> theDefault = Dafny.Sequence<Dafny.Rune>.Empty;
+    public static Dafny.ISequence<Dafny.Rune> Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>> _TYPE = new Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>>(Dafny.Sequence<Dafny.Rune>.Empty);
+    public static Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IPattern create(Dafny.ISequence<Dafny.Rune> content) {
+      return new Pattern(content);
+    }
+    public static _IPattern create_RawPattern(Dafny.ISequence<Dafny.Rune> content) {
+      return create(content);
+    }
+    public bool is_RawPattern { get { return true; } }
+    public Dafny.ISequence<Dafny.Rune> dtor_content {
+      get {
+        return this._content;
+      }
+    }
+    public static Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> _this, Dafny.ISequence<Dafny.Rune> ind) {
+      return (_this);
+    }
+  }
+
+  public interface _IMatchCase {
+    bool is_MatchCase { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_pattern { get; }
+    RAST._IExpr dtor_rhs { get; }
+    _IMatchCase DowncastClone();
+    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
+  }
+  public class MatchCase : _IMatchCase {
+    public readonly Dafny.ISequence<Dafny.Rune> _pattern;
+    public readonly RAST._IExpr _rhs;
+    public MatchCase(Dafny.ISequence<Dafny.Rune> pattern, RAST._IExpr rhs) {
+      this._pattern = pattern;
+      this._rhs = rhs;
+    }
+    public _IMatchCase DowncastClone() {
+      if (this is _IMatchCase dt) { return dt; }
+      return new MatchCase(_pattern, _rhs);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.MatchCase;
+      return oth != null && object.Equals(this._pattern, oth._pattern) && object.Equals(this._rhs, oth._rhs);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._pattern));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._rhs));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.MatchCase.MatchCase";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._pattern);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._rhs);
+      s += ")";
+      return s;
+    }
+    private static readonly RAST._IMatchCase theDefault = create(Dafny.Sequence<Dafny.Rune>.Empty, RAST.Expr.Default());
+    public static RAST._IMatchCase Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<RAST._IMatchCase> _TYPE = new Dafny.TypeDescriptor<RAST._IMatchCase>(RAST.MatchCase.Default());
+    public static Dafny.TypeDescriptor<RAST._IMatchCase> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IMatchCase create(Dafny.ISequence<Dafny.Rune> pattern, RAST._IExpr rhs) {
+      return new MatchCase(pattern, rhs);
+    }
+    public static _IMatchCase create_MatchCase(Dafny.ISequence<Dafny.Rune> pattern, RAST._IExpr rhs) {
+      return create(pattern, rhs);
+    }
+    public bool is_MatchCase { get { return true; } }
+    public Dafny.ISequence<Dafny.Rune> dtor_pattern {
+      get {
+        return this._pattern;
+      }
+    }
+    public RAST._IExpr dtor_rhs {
+      get {
+        return this._rhs;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
+      Dafny.ISequence<Dafny.Rune> _896_newIndent = ((((this).dtor_rhs).is_Block) ? (ind) : (Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND)));
+      Dafny.ISequence<Dafny.Rune> _897_rhsString = ((this).dtor_rhs)._ToString(_896_newIndent);
+      return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(RAST.Pattern._ToString((this).dtor_pattern, ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" =>")), ((((_897_rhsString).Contains(new Dafny.Rune('\n'))) && (((_897_rhsString).Select(BigInteger.Zero)) != (new Dafny.Rune('{')))) ? (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), ind), RAST.__default.IND), _897_rhsString)) : (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" "), _897_rhsString))));
+    }
+  }
+
+  public interface _IAssignIdentifier {
+    bool is_AssignIdentifier { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_identifier { get; }
+    RAST._IExpr dtor_rhs { get; }
+    _IAssignIdentifier DowncastClone();
+    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
+  }
+  public class AssignIdentifier : _IAssignIdentifier {
+    public readonly Dafny.ISequence<Dafny.Rune> _identifier;
+    public readonly RAST._IExpr _rhs;
+    public AssignIdentifier(Dafny.ISequence<Dafny.Rune> identifier, RAST._IExpr rhs) {
+      this._identifier = identifier;
+      this._rhs = rhs;
+    }
+    public _IAssignIdentifier DowncastClone() {
+      if (this is _IAssignIdentifier dt) { return dt; }
+      return new AssignIdentifier(_identifier, _rhs);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.AssignIdentifier;
+      return oth != null && object.Equals(this._identifier, oth._identifier) && object.Equals(this._rhs, oth._rhs);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._identifier));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._rhs));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.AssignIdentifier.AssignIdentifier";
+      s += "(";
+      s += this._identifier.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._rhs);
+      s += ")";
+      return s;
+    }
+    private static readonly RAST._IAssignIdentifier theDefault = create(Dafny.Sequence<Dafny.Rune>.Empty, RAST.Expr.Default());
+    public static RAST._IAssignIdentifier Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<RAST._IAssignIdentifier> _TYPE = new Dafny.TypeDescriptor<RAST._IAssignIdentifier>(RAST.AssignIdentifier.Default());
+    public static Dafny.TypeDescriptor<RAST._IAssignIdentifier> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IAssignIdentifier create(Dafny.ISequence<Dafny.Rune> identifier, RAST._IExpr rhs) {
+      return new AssignIdentifier(identifier, rhs);
+    }
+    public static _IAssignIdentifier create_AssignIdentifier(Dafny.ISequence<Dafny.Rune> identifier, RAST._IExpr rhs) {
+      return create(identifier, rhs);
+    }
+    public bool is_AssignIdentifier { get { return true; } }
+    public Dafny.ISequence<Dafny.Rune> dtor_identifier {
+      get {
+        return this._identifier;
+      }
+    }
+    public RAST._IExpr dtor_rhs {
+      get {
+        return this._rhs;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
+      return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat((this).dtor_identifier, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(": ")), ((this).dtor_rhs)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND)));
+    }
+  }
+
+  public interface _IDeclareType {
+    bool is_MUT { get; }
+    bool is_CONST { get; }
+    _IDeclareType DowncastClone();
+  }
+  public abstract class DeclareType : _IDeclareType {
+    public DeclareType() {
+    }
+    private static readonly RAST._IDeclareType theDefault = create_MUT();
+    public static RAST._IDeclareType Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<RAST._IDeclareType> _TYPE = new Dafny.TypeDescriptor<RAST._IDeclareType>(RAST.DeclareType.Default());
+    public static Dafny.TypeDescriptor<RAST._IDeclareType> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IDeclareType create_MUT() {
+      return new DeclareType_MUT();
+    }
+    public static _IDeclareType create_CONST() {
+      return new DeclareType_CONST();
+    }
+    public bool is_MUT { get { return this is DeclareType_MUT; } }
+    public bool is_CONST { get { return this is DeclareType_CONST; } }
+    public static System.Collections.Generic.IEnumerable<_IDeclareType> AllSingletonConstructors {
+      get {
+        yield return DeclareType.create_MUT();
+        yield return DeclareType.create_CONST();
+      }
+    }
+    public abstract _IDeclareType DowncastClone();
+  }
+  public class DeclareType_MUT : DeclareType {
+    public DeclareType_MUT() : base() {
+    }
+    public override _IDeclareType DowncastClone() {
+      if (this is _IDeclareType dt) { return dt; }
+      return new DeclareType_MUT();
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.DeclareType_MUT;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.DeclareType.MUT";
+      return s;
+    }
+  }
+  public class DeclareType_CONST : DeclareType {
+    public DeclareType_CONST() : base() {
+    }
+    public override _IDeclareType DowncastClone() {
+      if (this is _IDeclareType dt) { return dt; }
+      return new DeclareType_CONST();
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.DeclareType_CONST;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.DeclareType.CONST";
+      return s;
+    }
+  }
+
+  public interface _IAssociativity {
+    bool is_LeftToRight { get; }
+    bool is_RightToLeft { get; }
+    bool is_RequiresParentheses { get; }
+    _IAssociativity DowncastClone();
+  }
+  public abstract class Associativity : _IAssociativity {
+    public Associativity() {
+    }
+    private static readonly RAST._IAssociativity theDefault = create_LeftToRight();
+    public static RAST._IAssociativity Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<RAST._IAssociativity> _TYPE = new Dafny.TypeDescriptor<RAST._IAssociativity>(RAST.Associativity.Default());
+    public static Dafny.TypeDescriptor<RAST._IAssociativity> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IAssociativity create_LeftToRight() {
+      return new Associativity_LeftToRight();
+    }
+    public static _IAssociativity create_RightToLeft() {
+      return new Associativity_RightToLeft();
+    }
+    public static _IAssociativity create_RequiresParentheses() {
+      return new Associativity_RequiresParentheses();
+    }
+    public bool is_LeftToRight { get { return this is Associativity_LeftToRight; } }
+    public bool is_RightToLeft { get { return this is Associativity_RightToLeft; } }
+    public bool is_RequiresParentheses { get { return this is Associativity_RequiresParentheses; } }
+    public static System.Collections.Generic.IEnumerable<_IAssociativity> AllSingletonConstructors {
+      get {
+        yield return Associativity.create_LeftToRight();
+        yield return Associativity.create_RightToLeft();
+        yield return Associativity.create_RequiresParentheses();
+      }
+    }
+    public abstract _IAssociativity DowncastClone();
+  }
+  public class Associativity_LeftToRight : Associativity {
+    public Associativity_LeftToRight() : base() {
+    }
+    public override _IAssociativity DowncastClone() {
+      if (this is _IAssociativity dt) { return dt; }
+      return new Associativity_LeftToRight();
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Associativity_LeftToRight;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Associativity.LeftToRight";
+      return s;
+    }
+  }
+  public class Associativity_RightToLeft : Associativity {
+    public Associativity_RightToLeft() : base() {
+    }
+    public override _IAssociativity DowncastClone() {
+      if (this is _IAssociativity dt) { return dt; }
+      return new Associativity_RightToLeft();
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Associativity_RightToLeft;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Associativity.RightToLeft";
+      return s;
+    }
+  }
+  public class Associativity_RequiresParentheses : Associativity {
+    public Associativity_RequiresParentheses() : base() {
+    }
+    public override _IAssociativity DowncastClone() {
+      if (this is _IAssociativity dt) { return dt; }
+      return new Associativity_RequiresParentheses();
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Associativity_RequiresParentheses;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 2;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Associativity.RequiresParentheses";
+      return s;
+    }
+  }
+
+  public interface _IPrintingInfo {
+    bool is_UnknownPrecedence { get; }
+    bool is_Precedence { get; }
+    bool is_SuffixPrecedence { get; }
+    bool is_PrecedenceAssociativity { get; }
+    BigInteger dtor_precedence { get; }
+    RAST._IAssociativity dtor_associativity { get; }
+    _IPrintingInfo DowncastClone();
+    bool NeedParenthesesFor(RAST._IPrintingInfo underlying);
+    bool NeedParenthesesForLeft(RAST._IPrintingInfo underlying);
+    bool NeedParenthesesForRight(RAST._IPrintingInfo underlying);
+  }
+  public abstract class PrintingInfo : _IPrintingInfo {
+    public PrintingInfo() {
+    }
+    private static readonly RAST._IPrintingInfo theDefault = create_UnknownPrecedence();
+    public static RAST._IPrintingInfo Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<RAST._IPrintingInfo> _TYPE = new Dafny.TypeDescriptor<RAST._IPrintingInfo>(RAST.PrintingInfo.Default());
+    public static Dafny.TypeDescriptor<RAST._IPrintingInfo> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IPrintingInfo create_UnknownPrecedence() {
+      return new PrintingInfo_UnknownPrecedence();
+    }
+    public static _IPrintingInfo create_Precedence(BigInteger precedence) {
+      return new PrintingInfo_Precedence(precedence);
+    }
+    public static _IPrintingInfo create_SuffixPrecedence(BigInteger precedence) {
+      return new PrintingInfo_SuffixPrecedence(precedence);
+    }
+    public static _IPrintingInfo create_PrecedenceAssociativity(BigInteger precedence, RAST._IAssociativity associativity) {
+      return new PrintingInfo_PrecedenceAssociativity(precedence, associativity);
+    }
+    public bool is_UnknownPrecedence { get { return this is PrintingInfo_UnknownPrecedence; } }
+    public bool is_Precedence { get { return this is PrintingInfo_Precedence; } }
+    public bool is_SuffixPrecedence { get { return this is PrintingInfo_SuffixPrecedence; } }
+    public bool is_PrecedenceAssociativity { get { return this is PrintingInfo_PrecedenceAssociativity; } }
+    public BigInteger dtor_precedence {
+      get {
+        var d = this;
+        if (d is PrintingInfo_Precedence) { return ((PrintingInfo_Precedence)d)._precedence; }
+        if (d is PrintingInfo_SuffixPrecedence) { return ((PrintingInfo_SuffixPrecedence)d)._precedence; }
+        return ((PrintingInfo_PrecedenceAssociativity)d)._precedence;
+      }
+    }
+    public RAST._IAssociativity dtor_associativity {
+      get {
+        var d = this;
+        return ((PrintingInfo_PrecedenceAssociativity)d)._associativity;
+      }
+    }
+    public abstract _IPrintingInfo DowncastClone();
+    public bool NeedParenthesesFor(RAST._IPrintingInfo underlying) {
+      if ((this).is_UnknownPrecedence) {
+        return true;
+      } else if ((underlying).is_UnknownPrecedence) {
+        return true;
+      } else if (((this).dtor_precedence) <= ((underlying).dtor_precedence)) {
+        return true;
+      } else {
+        return false;
+      }
+    }
+    public bool NeedParenthesesForLeft(RAST._IPrintingInfo underlying) {
+      if ((this).is_UnknownPrecedence) {
+        return true;
+      } else if ((underlying).is_UnknownPrecedence) {
+        return true;
+      } else if (((this).dtor_precedence) <= ((underlying).dtor_precedence)) {
+        return ((((this).dtor_precedence) < ((underlying).dtor_precedence)) || (!((this).is_PrecedenceAssociativity))) || (!(((this).dtor_associativity).is_LeftToRight));
+      } else {
+        return false;
+      }
+    }
+    public bool NeedParenthesesForRight(RAST._IPrintingInfo underlying) {
+      if ((this).is_UnknownPrecedence) {
+        return true;
+      } else if ((underlying).is_UnknownPrecedence) {
+        return true;
+      } else if (((this).dtor_precedence) <= ((underlying).dtor_precedence)) {
+        return ((((this).dtor_precedence) < ((underlying).dtor_precedence)) || (!((this).is_PrecedenceAssociativity))) || (!(((this).dtor_associativity).is_RightToLeft));
+      } else {
+        return false;
+      }
+    }
+  }
+  public class PrintingInfo_UnknownPrecedence : PrintingInfo {
+    public PrintingInfo_UnknownPrecedence() : base() {
+    }
+    public override _IPrintingInfo DowncastClone() {
+      if (this is _IPrintingInfo dt) { return dt; }
+      return new PrintingInfo_UnknownPrecedence();
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.PrintingInfo_UnknownPrecedence;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.PrintingInfo.UnknownPrecedence";
+      return s;
+    }
+  }
+  public class PrintingInfo_Precedence : PrintingInfo {
+    public readonly BigInteger _precedence;
+    public PrintingInfo_Precedence(BigInteger precedence) : base() {
+      this._precedence = precedence;
+    }
+    public override _IPrintingInfo DowncastClone() {
+      if (this is _IPrintingInfo dt) { return dt; }
+      return new PrintingInfo_Precedence(_precedence);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.PrintingInfo_Precedence;
+      return oth != null && this._precedence == oth._precedence;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._precedence));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.PrintingInfo.Precedence";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._precedence);
+      s += ")";
+      return s;
+    }
+  }
+  public class PrintingInfo_SuffixPrecedence : PrintingInfo {
+    public readonly BigInteger _precedence;
+    public PrintingInfo_SuffixPrecedence(BigInteger precedence) : base() {
+      this._precedence = precedence;
+    }
+    public override _IPrintingInfo DowncastClone() {
+      if (this is _IPrintingInfo dt) { return dt; }
+      return new PrintingInfo_SuffixPrecedence(_precedence);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.PrintingInfo_SuffixPrecedence;
+      return oth != null && this._precedence == oth._precedence;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 2;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._precedence));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.PrintingInfo.SuffixPrecedence";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._precedence);
+      s += ")";
+      return s;
+    }
+  }
+  public class PrintingInfo_PrecedenceAssociativity : PrintingInfo {
+    public readonly BigInteger _precedence;
+    public readonly RAST._IAssociativity _associativity;
+    public PrintingInfo_PrecedenceAssociativity(BigInteger precedence, RAST._IAssociativity associativity) : base() {
+      this._precedence = precedence;
+      this._associativity = associativity;
+    }
+    public override _IPrintingInfo DowncastClone() {
+      if (this is _IPrintingInfo dt) { return dt; }
+      return new PrintingInfo_PrecedenceAssociativity(_precedence, _associativity);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.PrintingInfo_PrecedenceAssociativity;
+      return oth != null && this._precedence == oth._precedence && object.Equals(this._associativity, oth._associativity);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 3;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._precedence));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._associativity));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.PrintingInfo.PrecedenceAssociativity";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._precedence);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._associativity);
+      s += ")";
+      return s;
+    }
+  }
+
+  public interface _IExpr {
+    bool is_RawExpr { get; }
+    bool is_Identifier { get; }
+    bool is_Match { get; }
+    bool is_StmtExpr { get; }
+    bool is_Block { get; }
+    bool is_StructBuild { get; }
+    bool is_Tuple { get; }
+    bool is_UnaryOp { get; }
+    bool is_BinaryOp { get; }
+    bool is_TypeAscription { get; }
+    bool is_LiteralInt { get; }
+    bool is_LiteralString { get; }
+    bool is_ConversionNum { get; }
+    bool is_DeclareVar { get; }
+    bool is_AssignVar { get; }
+    bool is_IfExpr { get; }
+    bool is_Loop { get; }
+    bool is_For { get; }
+    bool is_Labelled { get; }
+    bool is_Break { get; }
+    bool is_Continue { get; }
+    bool is_Return { get; }
+    bool is_Call { get; }
+    bool is_Select { get; }
+    bool is_MemberSelect { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_content { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
+    RAST._IExpr dtor_matchee { get; }
+    Dafny.ISequence<RAST._IMatchCase> dtor_cases { get; }
+    RAST._IExpr dtor_stmt { get; }
+    RAST._IExpr dtor_rhs { get; }
+    RAST._IExpr dtor_underlying { get; }
+    Dafny.ISequence<RAST._IAssignIdentifier> dtor_assignments { get; }
+    Dafny.ISequence<RAST._IExpr> dtor_arguments { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_op1 { get; }
+    DAST.Format._IUnaryOpFormat dtor_format { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_op2 { get; }
+    RAST._IExpr dtor_left { get; }
+    RAST._IExpr dtor_right { get; }
+    DAST.Format._IBinaryOpFormat dtor_format2 { get; }
+    RAST._IType dtor_tpe { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_value { get; }
+    bool dtor_binary { get; }
+    RAST._IDeclareType dtor_declareType { get; }
+    Std.Wrappers._IOption<RAST._IType> dtor_optType { get; }
+    Std.Wrappers._IOption<RAST._IExpr> dtor_optRhs { get; }
+    RAST._IExpr dtor_cond { get; }
+    RAST._IExpr dtor_thn { get; }
+    RAST._IExpr dtor_els { get; }
+    Std.Wrappers._IOption<RAST._IExpr> dtor_optCond { get; }
+    RAST._IExpr dtor_range { get; }
+    RAST._IExpr dtor_body { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_lbl { get; }
+    Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> dtor_optLbl { get; }
+    Std.Wrappers._IOption<RAST._IExpr> dtor_optExpr { get; }
+    RAST._IExpr dtor_obj { get; }
+    Dafny.ISequence<RAST._IType> dtor_typeParameters { get; }
+    _IExpr DowncastClone();
+    bool NoExtraSemicolonAfter();
+    RAST._IPrintingInfo printingInfo { get; }
+    RAST._IExpr Optimize();
+    bool LeftRequiresParentheses(RAST._IExpr left);
+    _System._ITuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>> LeftParentheses(RAST._IExpr left);
+    bool RightRequiresParentheses(RAST._IExpr right);
+    _System._ITuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>> RightParentheses(RAST._IExpr right);
+    Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> RightMostIdentifier();
+    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
+    RAST._IExpr Then(RAST._IExpr rhs2);
+    RAST._IExpr Sel(Dafny.ISequence<Dafny.Rune> name);
+    RAST._IExpr MSel(Dafny.ISequence<Dafny.Rune> name);
+    RAST._IExpr Apply(Dafny.ISequence<RAST._IType> typeParameters, Dafny.ISequence<RAST._IExpr> arguments);
+    RAST._IExpr Apply1(RAST._IExpr argument);
+  }
+  public abstract class Expr : _IExpr {
+    public Expr() {
+    }
+    private static readonly RAST._IExpr theDefault = create_RawExpr(Dafny.Sequence<Dafny.Rune>.Empty);
+    public static RAST._IExpr Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<RAST._IExpr> _TYPE = new Dafny.TypeDescriptor<RAST._IExpr>(RAST.Expr.Default());
+    public static Dafny.TypeDescriptor<RAST._IExpr> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IExpr create_RawExpr(Dafny.ISequence<Dafny.Rune> content) {
+      return new Expr_RawExpr(content);
+    }
+    public static _IExpr create_Identifier(Dafny.ISequence<Dafny.Rune> name) {
+      return new Expr_Identifier(name);
+    }
+    public static _IExpr create_Match(RAST._IExpr matchee, Dafny.ISequence<RAST._IMatchCase> cases) {
+      return new Expr_Match(matchee, cases);
+    }
+    public static _IExpr create_StmtExpr(RAST._IExpr stmt, RAST._IExpr rhs) {
+      return new Expr_StmtExpr(stmt, rhs);
+    }
+    public static _IExpr create_Block(RAST._IExpr underlying) {
+      return new Expr_Block(underlying);
+    }
+    public static _IExpr create_StructBuild(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<RAST._IAssignIdentifier> assignments) {
+      return new Expr_StructBuild(name, assignments);
+    }
+    public static _IExpr create_Tuple(Dafny.ISequence<RAST._IExpr> arguments) {
+      return new Expr_Tuple(arguments);
+    }
+    public static _IExpr create_UnaryOp(Dafny.ISequence<Dafny.Rune> op1, RAST._IExpr underlying, DAST.Format._IUnaryOpFormat format) {
+      return new Expr_UnaryOp(op1, underlying, format);
+    }
+    public static _IExpr create_BinaryOp(Dafny.ISequence<Dafny.Rune> op2, RAST._IExpr left, RAST._IExpr right, DAST.Format._IBinaryOpFormat format2) {
+      return new Expr_BinaryOp(op2, left, right, format2);
+    }
+    public static _IExpr create_TypeAscription(RAST._IExpr left, RAST._IType tpe) {
+      return new Expr_TypeAscription(left, tpe);
+    }
+    public static _IExpr create_LiteralInt(Dafny.ISequence<Dafny.Rune> @value) {
+      return new Expr_LiteralInt(@value);
+    }
+    public static _IExpr create_LiteralString(Dafny.ISequence<Dafny.Rune> @value, bool binary) {
+      return new Expr_LiteralString(@value, binary);
+    }
+    public static _IExpr create_ConversionNum(RAST._IType tpe, RAST._IExpr underlying) {
+      return new Expr_ConversionNum(tpe, underlying);
+    }
+    public static _IExpr create_DeclareVar(RAST._IDeclareType declareType, Dafny.ISequence<Dafny.Rune> name, Std.Wrappers._IOption<RAST._IType> optType, Std.Wrappers._IOption<RAST._IExpr> optRhs) {
+      return new Expr_DeclareVar(declareType, name, optType, optRhs);
+    }
+    public static _IExpr create_AssignVar(Dafny.ISequence<Dafny.Rune> name, RAST._IExpr rhs) {
+      return new Expr_AssignVar(name, rhs);
+    }
+    public static _IExpr create_IfExpr(RAST._IExpr cond, RAST._IExpr thn, RAST._IExpr els) {
+      return new Expr_IfExpr(cond, thn, els);
+    }
+    public static _IExpr create_Loop(Std.Wrappers._IOption<RAST._IExpr> optCond, RAST._IExpr underlying) {
+      return new Expr_Loop(optCond, underlying);
+    }
+    public static _IExpr create_For(Dafny.ISequence<Dafny.Rune> name, RAST._IExpr range, RAST._IExpr body) {
+      return new Expr_For(name, range, body);
+    }
+    public static _IExpr create_Labelled(Dafny.ISequence<Dafny.Rune> lbl, RAST._IExpr underlying) {
+      return new Expr_Labelled(lbl, underlying);
+    }
+    public static _IExpr create_Break(Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> optLbl) {
+      return new Expr_Break(optLbl);
+    }
+    public static _IExpr create_Continue(Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> optLbl) {
+      return new Expr_Continue(optLbl);
+    }
+    public static _IExpr create_Return(Std.Wrappers._IOption<RAST._IExpr> optExpr) {
+      return new Expr_Return(optExpr);
+    }
+    public static _IExpr create_Call(RAST._IExpr obj, Dafny.ISequence<RAST._IType> typeParameters, Dafny.ISequence<RAST._IExpr> arguments) {
+      return new Expr_Call(obj, typeParameters, arguments);
+    }
+    public static _IExpr create_Select(RAST._IExpr obj, Dafny.ISequence<Dafny.Rune> name) {
+      return new Expr_Select(obj, name);
+    }
+    public static _IExpr create_MemberSelect(RAST._IExpr obj, Dafny.ISequence<Dafny.Rune> name) {
+      return new Expr_MemberSelect(obj, name);
+    }
+    public bool is_RawExpr { get { return this is Expr_RawExpr; } }
+    public bool is_Identifier { get { return this is Expr_Identifier; } }
+    public bool is_Match { get { return this is Expr_Match; } }
+    public bool is_StmtExpr { get { return this is Expr_StmtExpr; } }
+    public bool is_Block { get { return this is Expr_Block; } }
+    public bool is_StructBuild { get { return this is Expr_StructBuild; } }
+    public bool is_Tuple { get { return this is Expr_Tuple; } }
+    public bool is_UnaryOp { get { return this is Expr_UnaryOp; } }
+    public bool is_BinaryOp { get { return this is Expr_BinaryOp; } }
+    public bool is_TypeAscription { get { return this is Expr_TypeAscription; } }
+    public bool is_LiteralInt { get { return this is Expr_LiteralInt; } }
+    public bool is_LiteralString { get { return this is Expr_LiteralString; } }
+    public bool is_ConversionNum { get { return this is Expr_ConversionNum; } }
+    public bool is_DeclareVar { get { return this is Expr_DeclareVar; } }
+    public bool is_AssignVar { get { return this is Expr_AssignVar; } }
+    public bool is_IfExpr { get { return this is Expr_IfExpr; } }
+    public bool is_Loop { get { return this is Expr_Loop; } }
+    public bool is_For { get { return this is Expr_For; } }
+    public bool is_Labelled { get { return this is Expr_Labelled; } }
+    public bool is_Break { get { return this is Expr_Break; } }
+    public bool is_Continue { get { return this is Expr_Continue; } }
+    public bool is_Return { get { return this is Expr_Return; } }
+    public bool is_Call { get { return this is Expr_Call; } }
+    public bool is_Select { get { return this is Expr_Select; } }
+    public bool is_MemberSelect { get { return this is Expr_MemberSelect; } }
+    public Dafny.ISequence<Dafny.Rune> dtor_content {
+      get {
+        var d = this;
+        return ((Expr_RawExpr)d)._content;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_name {
+      get {
+        var d = this;
+        if (d is Expr_Identifier) { return ((Expr_Identifier)d)._name; }
+        if (d is Expr_StructBuild) { return ((Expr_StructBuild)d)._name; }
+        if (d is Expr_DeclareVar) { return ((Expr_DeclareVar)d)._name; }
+        if (d is Expr_AssignVar) { return ((Expr_AssignVar)d)._name; }
+        if (d is Expr_For) { return ((Expr_For)d)._name; }
+        if (d is Expr_Select) { return ((Expr_Select)d)._name; }
+        return ((Expr_MemberSelect)d)._name;
+      }
+    }
+    public RAST._IExpr dtor_matchee {
+      get {
+        var d = this;
+        return ((Expr_Match)d)._matchee;
+      }
+    }
+    public Dafny.ISequence<RAST._IMatchCase> dtor_cases {
+      get {
+        var d = this;
+        return ((Expr_Match)d)._cases;
+      }
+    }
+    public RAST._IExpr dtor_stmt {
+      get {
+        var d = this;
+        return ((Expr_StmtExpr)d)._stmt;
+      }
+    }
+    public RAST._IExpr dtor_rhs {
+      get {
+        var d = this;
+        if (d is Expr_StmtExpr) { return ((Expr_StmtExpr)d)._rhs; }
+        return ((Expr_AssignVar)d)._rhs;
+      }
+    }
+    public RAST._IExpr dtor_underlying {
+      get {
+        var d = this;
+        if (d is Expr_Block) { return ((Expr_Block)d)._underlying; }
+        if (d is Expr_UnaryOp) { return ((Expr_UnaryOp)d)._underlying; }
+        if (d is Expr_ConversionNum) { return ((Expr_ConversionNum)d)._underlying; }
+        if (d is Expr_Loop) { return ((Expr_Loop)d)._underlying; }
+        return ((Expr_Labelled)d)._underlying;
+      }
+    }
+    public Dafny.ISequence<RAST._IAssignIdentifier> dtor_assignments {
+      get {
+        var d = this;
+        return ((Expr_StructBuild)d)._assignments;
+      }
+    }
+    public Dafny.ISequence<RAST._IExpr> dtor_arguments {
+      get {
+        var d = this;
+        if (d is Expr_Tuple) { return ((Expr_Tuple)d)._arguments; }
+        return ((Expr_Call)d)._arguments;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_op1 {
+      get {
+        var d = this;
+        return ((Expr_UnaryOp)d)._op1;
+      }
+    }
+    public DAST.Format._IUnaryOpFormat dtor_format {
+      get {
+        var d = this;
+        return ((Expr_UnaryOp)d)._format;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_op2 {
+      get {
+        var d = this;
+        return ((Expr_BinaryOp)d)._op2;
+      }
+    }
+    public RAST._IExpr dtor_left {
+      get {
+        var d = this;
+        if (d is Expr_BinaryOp) { return ((Expr_BinaryOp)d)._left; }
+        return ((Expr_TypeAscription)d)._left;
+      }
+    }
+    public RAST._IExpr dtor_right {
+      get {
+        var d = this;
+        return ((Expr_BinaryOp)d)._right;
+      }
+    }
+    public DAST.Format._IBinaryOpFormat dtor_format2 {
+      get {
+        var d = this;
+        return ((Expr_BinaryOp)d)._format2;
+      }
+    }
+    public RAST._IType dtor_tpe {
+      get {
+        var d = this;
+        if (d is Expr_TypeAscription) { return ((Expr_TypeAscription)d)._tpe; }
+        return ((Expr_ConversionNum)d)._tpe;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_value {
+      get {
+        var d = this;
+        if (d is Expr_LiteralInt) { return ((Expr_LiteralInt)d)._value; }
+        return ((Expr_LiteralString)d)._value;
+      }
+    }
+    public bool dtor_binary {
+      get {
+        var d = this;
+        return ((Expr_LiteralString)d)._binary;
+      }
+    }
+    public RAST._IDeclareType dtor_declareType {
+      get {
+        var d = this;
+        return ((Expr_DeclareVar)d)._declareType;
+      }
+    }
+    public Std.Wrappers._IOption<RAST._IType> dtor_optType {
+      get {
+        var d = this;
+        return ((Expr_DeclareVar)d)._optType;
+      }
+    }
+    public Std.Wrappers._IOption<RAST._IExpr> dtor_optRhs {
+      get {
+        var d = this;
+        return ((Expr_DeclareVar)d)._optRhs;
+      }
+    }
+    public RAST._IExpr dtor_cond {
+      get {
+        var d = this;
+        return ((Expr_IfExpr)d)._cond;
+      }
+    }
+    public RAST._IExpr dtor_thn {
+      get {
+        var d = this;
+        return ((Expr_IfExpr)d)._thn;
+      }
+    }
+    public RAST._IExpr dtor_els {
+      get {
+        var d = this;
+        return ((Expr_IfExpr)d)._els;
+      }
+    }
+    public Std.Wrappers._IOption<RAST._IExpr> dtor_optCond {
+      get {
+        var d = this;
+        return ((Expr_Loop)d)._optCond;
+      }
+    }
+    public RAST._IExpr dtor_range {
+      get {
+        var d = this;
+        return ((Expr_For)d)._range;
+      }
+    }
+    public RAST._IExpr dtor_body {
+      get {
+        var d = this;
+        return ((Expr_For)d)._body;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_lbl {
+      get {
+        var d = this;
+        return ((Expr_Labelled)d)._lbl;
+      }
+    }
+    public Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> dtor_optLbl {
+      get {
+        var d = this;
+        if (d is Expr_Break) { return ((Expr_Break)d)._optLbl; }
+        return ((Expr_Continue)d)._optLbl;
+      }
+    }
+    public Std.Wrappers._IOption<RAST._IExpr> dtor_optExpr {
+      get {
+        var d = this;
+        return ((Expr_Return)d)._optExpr;
+      }
+    }
+    public RAST._IExpr dtor_obj {
+      get {
+        var d = this;
+        if (d is Expr_Call) { return ((Expr_Call)d)._obj; }
+        if (d is Expr_Select) { return ((Expr_Select)d)._obj; }
+        return ((Expr_MemberSelect)d)._obj;
+      }
+    }
+    public Dafny.ISequence<RAST._IType> dtor_typeParameters {
+      get {
+        var d = this;
+        return ((Expr_Call)d)._typeParameters;
+      }
+    }
+    public abstract _IExpr DowncastClone();
+    public bool NoExtraSemicolonAfter() {
+      return ((((((this).is_DeclareVar) || ((this).is_AssignVar)) || ((this).is_Break)) || ((this).is_Continue)) || ((this).is_Return)) || ((((this).is_RawExpr) && ((new BigInteger(((this).dtor_content).Count)).Sign == 1)) && ((((this).dtor_content).Select((new BigInteger(((this).dtor_content).Count)) - (BigInteger.One))) == (new Dafny.Rune(';'))));
+    }
+    public RAST._IExpr Optimize() {
+      RAST._IExpr _source27 = this;
+      if (_source27.is_RawExpr) {
+        Dafny.ISequence<Dafny.Rune> _898___mcc_h0 = _source27.dtor_content;
+        return this;
+      } else if (_source27.is_Identifier) {
+        Dafny.ISequence<Dafny.Rune> _899___mcc_h2 = _source27.dtor_name;
+        return this;
+      } else if (_source27.is_Match) {
+        RAST._IExpr _900___mcc_h4 = _source27.dtor_matchee;
+        Dafny.ISequence<RAST._IMatchCase> _901___mcc_h5 = _source27.dtor_cases;
+        return this;
+      } else if (_source27.is_StmtExpr) {
+        RAST._IExpr _902___mcc_h8 = _source27.dtor_stmt;
+        RAST._IExpr _903___mcc_h9 = _source27.dtor_rhs;
+        RAST._IExpr _source28 = _902___mcc_h8;
+        if (_source28.is_RawExpr) {
+          Dafny.ISequence<Dafny.Rune> _904___mcc_h12 = _source28.dtor_content;
+          return this;
+        } else if (_source28.is_Identifier) {
+          Dafny.ISequence<Dafny.Rune> _905___mcc_h14 = _source28.dtor_name;
+          return this;
+        } else if (_source28.is_Match) {
+          RAST._IExpr _906___mcc_h16 = _source28.dtor_matchee;
+          Dafny.ISequence<RAST._IMatchCase> _907___mcc_h17 = _source28.dtor_cases;
+          return this;
+        } else if (_source28.is_StmtExpr) {
+          RAST._IExpr _908___mcc_h20 = _source28.dtor_stmt;
+          RAST._IExpr _909___mcc_h21 = _source28.dtor_rhs;
+          return this;
+        } else if (_source28.is_Block) {
+          RAST._IExpr _910___mcc_h24 = _source28.dtor_underlying;
+          return this;
+        } else if (_source28.is_StructBuild) {
+          Dafny.ISequence<Dafny.Rune> _911___mcc_h26 = _source28.dtor_name;
+          Dafny.ISequence<RAST._IAssignIdentifier> _912___mcc_h27 = _source28.dtor_assignments;
+          return this;
+        } else if (_source28.is_Tuple) {
+          Dafny.ISequence<RAST._IExpr> _913___mcc_h30 = _source28.dtor_arguments;
+          return this;
+        } else if (_source28.is_UnaryOp) {
+          Dafny.ISequence<Dafny.Rune> _914___mcc_h32 = _source28.dtor_op1;
+          RAST._IExpr _915___mcc_h33 = _source28.dtor_underlying;
+          DAST.Format._IUnaryOpFormat _916___mcc_h34 = _source28.dtor_format;
+          return this;
+        } else if (_source28.is_BinaryOp) {
+          Dafny.ISequence<Dafny.Rune> _917___mcc_h38 = _source28.dtor_op2;
+          RAST._IExpr _918___mcc_h39 = _source28.dtor_left;
+          RAST._IExpr _919___mcc_h40 = _source28.dtor_right;
+          DAST.Format._IBinaryOpFormat _920___mcc_h41 = _source28.dtor_format2;
+          return this;
+        } else if (_source28.is_TypeAscription) {
+          RAST._IExpr _921___mcc_h46 = _source28.dtor_left;
+          RAST._IType _922___mcc_h47 = _source28.dtor_tpe;
+          return this;
+        } else if (_source28.is_LiteralInt) {
+          Dafny.ISequence<Dafny.Rune> _923___mcc_h50 = _source28.dtor_value;
+          return this;
+        } else if (_source28.is_LiteralString) {
+          Dafny.ISequence<Dafny.Rune> _924___mcc_h52 = _source28.dtor_value;
+          bool _925___mcc_h53 = _source28.dtor_binary;
+          return this;
+        } else if (_source28.is_ConversionNum) {
+          RAST._IType _926___mcc_h56 = _source28.dtor_tpe;
+          RAST._IExpr _927___mcc_h57 = _source28.dtor_underlying;
+          return this;
+        } else if (_source28.is_DeclareVar) {
+          RAST._IDeclareType _928___mcc_h60 = _source28.dtor_declareType;
+          Dafny.ISequence<Dafny.Rune> _929___mcc_h61 = _source28.dtor_name;
+          Std.Wrappers._IOption<RAST._IType> _930___mcc_h62 = _source28.dtor_optType;
+          Std.Wrappers._IOption<RAST._IExpr> _931___mcc_h63 = _source28.dtor_optRhs;
+          Std.Wrappers._IOption<RAST._IType> _source29 = _930___mcc_h62;
+          if (_source29.is_None) {
+            return this;
+          } else {
+            RAST._IType _932___mcc_h68 = _source29.dtor_value;
+            Std.Wrappers._IOption<RAST._IExpr> _source30 = _931___mcc_h63;
+            if (_source30.is_None) {
+              RAST._IExpr _source31 = _903___mcc_h9;
+              if (_source31.is_RawExpr) {
+                Dafny.ISequence<Dafny.Rune> _933___mcc_h70 = _source31.dtor_content;
+                return this;
+              } else if (_source31.is_Identifier) {
+                Dafny.ISequence<Dafny.Rune> _934___mcc_h72 = _source31.dtor_name;
+                return this;
+              } else if (_source31.is_Match) {
+                RAST._IExpr _935___mcc_h74 = _source31.dtor_matchee;
+                Dafny.ISequence<RAST._IMatchCase> _936___mcc_h75 = _source31.dtor_cases;
+                return this;
+              } else if (_source31.is_StmtExpr) {
+                RAST._IExpr _937___mcc_h78 = _source31.dtor_stmt;
+                RAST._IExpr _938___mcc_h79 = _source31.dtor_rhs;
+                RAST._IExpr _source32 = _937___mcc_h78;
+                if (_source32.is_RawExpr) {
+                  Dafny.ISequence<Dafny.Rune> _939___mcc_h82 = _source32.dtor_content;
+                  return this;
+                } else if (_source32.is_Identifier) {
+                  Dafny.ISequence<Dafny.Rune> _940___mcc_h84 = _source32.dtor_name;
+                  return this;
+                } else if (_source32.is_Match) {
+                  RAST._IExpr _941___mcc_h86 = _source32.dtor_matchee;
+                  Dafny.ISequence<RAST._IMatchCase> _942___mcc_h87 = _source32.dtor_cases;
+                  return this;
+                } else if (_source32.is_StmtExpr) {
+                  RAST._IExpr _943___mcc_h90 = _source32.dtor_stmt;
+                  RAST._IExpr _944___mcc_h91 = _source32.dtor_rhs;
+                  return this;
+                } else if (_source32.is_Block) {
+                  RAST._IExpr _945___mcc_h94 = _source32.dtor_underlying;
+                  return this;
+                } else if (_source32.is_StructBuild) {
+                  Dafny.ISequence<Dafny.Rune> _946___mcc_h96 = _source32.dtor_name;
+                  Dafny.ISequence<RAST._IAssignIdentifier> _947___mcc_h97 = _source32.dtor_assignments;
+                  return this;
+                } else if (_source32.is_Tuple) {
+                  Dafny.ISequence<RAST._IExpr> _948___mcc_h100 = _source32.dtor_arguments;
+                  return this;
+                } else if (_source32.is_UnaryOp) {
+                  Dafny.ISequence<Dafny.Rune> _949___mcc_h102 = _source32.dtor_op1;
+                  RAST._IExpr _950___mcc_h103 = _source32.dtor_underlying;
+                  DAST.Format._IUnaryOpFormat _951___mcc_h104 = _source32.dtor_format;
+                  return this;
+                } else if (_source32.is_BinaryOp) {
+                  Dafny.ISequence<Dafny.Rune> _952___mcc_h108 = _source32.dtor_op2;
+                  RAST._IExpr _953___mcc_h109 = _source32.dtor_left;
+                  RAST._IExpr _954___mcc_h110 = _source32.dtor_right;
+                  DAST.Format._IBinaryOpFormat _955___mcc_h111 = _source32.dtor_format2;
+                  return this;
+                } else if (_source32.is_TypeAscription) {
+                  RAST._IExpr _956___mcc_h116 = _source32.dtor_left;
+                  RAST._IType _957___mcc_h117 = _source32.dtor_tpe;
+                  return this;
+                } else if (_source32.is_LiteralInt) {
+                  Dafny.ISequence<Dafny.Rune> _958___mcc_h120 = _source32.dtor_value;
+                  return this;
+                } else if (_source32.is_LiteralString) {
+                  Dafny.ISequence<Dafny.Rune> _959___mcc_h122 = _source32.dtor_value;
+                  bool _960___mcc_h123 = _source32.dtor_binary;
+                  return this;
+                } else if (_source32.is_ConversionNum) {
+                  RAST._IType _961___mcc_h126 = _source32.dtor_tpe;
+                  RAST._IExpr _962___mcc_h127 = _source32.dtor_underlying;
+                  return this;
+                } else if (_source32.is_DeclareVar) {
+                  RAST._IDeclareType _963___mcc_h130 = _source32.dtor_declareType;
+                  Dafny.ISequence<Dafny.Rune> _964___mcc_h131 = _source32.dtor_name;
+                  Std.Wrappers._IOption<RAST._IType> _965___mcc_h132 = _source32.dtor_optType;
+                  Std.Wrappers._IOption<RAST._IExpr> _966___mcc_h133 = _source32.dtor_optRhs;
+                  return this;
+                } else if (_source32.is_AssignVar) {
+                  Dafny.ISequence<Dafny.Rune> _967___mcc_h138 = _source32.dtor_name;
+                  RAST._IExpr _968___mcc_h139 = _source32.dtor_rhs;
+                  RAST._IExpr _969_last = _938___mcc_h79;
+                  RAST._IExpr _970_rhs = _968___mcc_h139;
+                  Dafny.ISequence<Dafny.Rune> _971_name2 = _967___mcc_h138;
+                  RAST._IType _972_tpe = _932___mcc_h68;
+                  Dafny.ISequence<Dafny.Rune> _973_name = _929___mcc_h61;
+                  RAST._IDeclareType _974_mod = _928___mcc_h60;
+                  if ((_973_name).Equals(_971_name2)) {
+                    RAST._IExpr _975_rewriting = RAST.Expr.create_StmtExpr(RAST.Expr.create_DeclareVar(_974_mod, _973_name, Std.Wrappers.Option<RAST._IType>.create_Some(_972_tpe), Std.Wrappers.Option<RAST._IExpr>.create_Some(_970_rhs)), _969_last);
+                    return _975_rewriting;
+                  } else {
+                    return this;
+                  }
+                } else if (_source32.is_IfExpr) {
+                  RAST._IExpr _976___mcc_h142 = _source32.dtor_cond;
+                  RAST._IExpr _977___mcc_h143 = _source32.dtor_thn;
+                  RAST._IExpr _978___mcc_h144 = _source32.dtor_els;
+                  return this;
+                } else if (_source32.is_Loop) {
+                  Std.Wrappers._IOption<RAST._IExpr> _979___mcc_h148 = _source32.dtor_optCond;
+                  RAST._IExpr _980___mcc_h149 = _source32.dtor_underlying;
+                  return this;
+                } else if (_source32.is_For) {
+                  Dafny.ISequence<Dafny.Rune> _981___mcc_h152 = _source32.dtor_name;
+                  RAST._IExpr _982___mcc_h153 = _source32.dtor_range;
+                  RAST._IExpr _983___mcc_h154 = _source32.dtor_body;
+                  return this;
+                } else if (_source32.is_Labelled) {
+                  Dafny.ISequence<Dafny.Rune> _984___mcc_h158 = _source32.dtor_lbl;
+                  RAST._IExpr _985___mcc_h159 = _source32.dtor_underlying;
+                  return this;
+                } else if (_source32.is_Break) {
+                  Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _986___mcc_h162 = _source32.dtor_optLbl;
+                  return this;
+                } else if (_source32.is_Continue) {
+                  Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _987___mcc_h164 = _source32.dtor_optLbl;
+                  return this;
+                } else if (_source32.is_Return) {
+                  Std.Wrappers._IOption<RAST._IExpr> _988___mcc_h166 = _source32.dtor_optExpr;
+                  return this;
+                } else if (_source32.is_Call) {
+                  RAST._IExpr _989___mcc_h168 = _source32.dtor_obj;
+                  Dafny.ISequence<RAST._IType> _990___mcc_h169 = _source32.dtor_typeParameters;
+                  Dafny.ISequence<RAST._IExpr> _991___mcc_h170 = _source32.dtor_arguments;
+                  return this;
+                } else if (_source32.is_Select) {
+                  RAST._IExpr _992___mcc_h174 = _source32.dtor_obj;
+                  Dafny.ISequence<Dafny.Rune> _993___mcc_h175 = _source32.dtor_name;
+                  return this;
+                } else {
+                  RAST._IExpr _994___mcc_h178 = _source32.dtor_obj;
+                  Dafny.ISequence<Dafny.Rune> _995___mcc_h179 = _source32.dtor_name;
+                  return this;
+                }
+              } else if (_source31.is_Block) {
+                RAST._IExpr _996___mcc_h182 = _source31.dtor_underlying;
+                return this;
+              } else if (_source31.is_StructBuild) {
+                Dafny.ISequence<Dafny.Rune> _997___mcc_h184 = _source31.dtor_name;
+                Dafny.ISequence<RAST._IAssignIdentifier> _998___mcc_h185 = _source31.dtor_assignments;
+                return this;
+              } else if (_source31.is_Tuple) {
+                Dafny.ISequence<RAST._IExpr> _999___mcc_h188 = _source31.dtor_arguments;
+                return this;
+              } else if (_source31.is_UnaryOp) {
+                Dafny.ISequence<Dafny.Rune> _1000___mcc_h190 = _source31.dtor_op1;
+                RAST._IExpr _1001___mcc_h191 = _source31.dtor_underlying;
+                DAST.Format._IUnaryOpFormat _1002___mcc_h192 = _source31.dtor_format;
+                return this;
+              } else if (_source31.is_BinaryOp) {
+                Dafny.ISequence<Dafny.Rune> _1003___mcc_h196 = _source31.dtor_op2;
+                RAST._IExpr _1004___mcc_h197 = _source31.dtor_left;
+                RAST._IExpr _1005___mcc_h198 = _source31.dtor_right;
+                DAST.Format._IBinaryOpFormat _1006___mcc_h199 = _source31.dtor_format2;
+                return this;
+              } else if (_source31.is_TypeAscription) {
+                RAST._IExpr _1007___mcc_h204 = _source31.dtor_left;
+                RAST._IType _1008___mcc_h205 = _source31.dtor_tpe;
+                return this;
+              } else if (_source31.is_LiteralInt) {
+                Dafny.ISequence<Dafny.Rune> _1009___mcc_h208 = _source31.dtor_value;
+                return this;
+              } else if (_source31.is_LiteralString) {
+                Dafny.ISequence<Dafny.Rune> _1010___mcc_h210 = _source31.dtor_value;
+                bool _1011___mcc_h211 = _source31.dtor_binary;
+                return this;
+              } else if (_source31.is_ConversionNum) {
+                RAST._IType _1012___mcc_h214 = _source31.dtor_tpe;
+                RAST._IExpr _1013___mcc_h215 = _source31.dtor_underlying;
+                return this;
+              } else if (_source31.is_DeclareVar) {
+                RAST._IDeclareType _1014___mcc_h218 = _source31.dtor_declareType;
+                Dafny.ISequence<Dafny.Rune> _1015___mcc_h219 = _source31.dtor_name;
+                Std.Wrappers._IOption<RAST._IType> _1016___mcc_h220 = _source31.dtor_optType;
+                Std.Wrappers._IOption<RAST._IExpr> _1017___mcc_h221 = _source31.dtor_optRhs;
+                return this;
+              } else if (_source31.is_AssignVar) {
+                Dafny.ISequence<Dafny.Rune> _1018___mcc_h226 = _source31.dtor_name;
+                RAST._IExpr _1019___mcc_h227 = _source31.dtor_rhs;
+                return this;
+              } else if (_source31.is_IfExpr) {
+                RAST._IExpr _1020___mcc_h230 = _source31.dtor_cond;
+                RAST._IExpr _1021___mcc_h231 = _source31.dtor_thn;
+                RAST._IExpr _1022___mcc_h232 = _source31.dtor_els;
+                return this;
+              } else if (_source31.is_Loop) {
+                Std.Wrappers._IOption<RAST._IExpr> _1023___mcc_h236 = _source31.dtor_optCond;
+                RAST._IExpr _1024___mcc_h237 = _source31.dtor_underlying;
+                return this;
+              } else if (_source31.is_For) {
+                Dafny.ISequence<Dafny.Rune> _1025___mcc_h240 = _source31.dtor_name;
+                RAST._IExpr _1026___mcc_h241 = _source31.dtor_range;
+                RAST._IExpr _1027___mcc_h242 = _source31.dtor_body;
+                return this;
+              } else if (_source31.is_Labelled) {
+                Dafny.ISequence<Dafny.Rune> _1028___mcc_h246 = _source31.dtor_lbl;
+                RAST._IExpr _1029___mcc_h247 = _source31.dtor_underlying;
+                return this;
+              } else if (_source31.is_Break) {
+                Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1030___mcc_h250 = _source31.dtor_optLbl;
+                return this;
+              } else if (_source31.is_Continue) {
+                Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1031___mcc_h252 = _source31.dtor_optLbl;
+                return this;
+              } else if (_source31.is_Return) {
+                Std.Wrappers._IOption<RAST._IExpr> _1032___mcc_h254 = _source31.dtor_optExpr;
+                return this;
+              } else if (_source31.is_Call) {
+                RAST._IExpr _1033___mcc_h256 = _source31.dtor_obj;
+                Dafny.ISequence<RAST._IType> _1034___mcc_h257 = _source31.dtor_typeParameters;
+                Dafny.ISequence<RAST._IExpr> _1035___mcc_h258 = _source31.dtor_arguments;
+                return this;
+              } else if (_source31.is_Select) {
+                RAST._IExpr _1036___mcc_h262 = _source31.dtor_obj;
+                Dafny.ISequence<Dafny.Rune> _1037___mcc_h263 = _source31.dtor_name;
+                return this;
+              } else {
+                RAST._IExpr _1038___mcc_h266 = _source31.dtor_obj;
+                Dafny.ISequence<Dafny.Rune> _1039___mcc_h267 = _source31.dtor_name;
+                return this;
+              }
+            } else {
+              RAST._IExpr _1040___mcc_h270 = _source30.dtor_value;
+              return this;
+            }
+          }
+        } else if (_source28.is_AssignVar) {
+          Dafny.ISequence<Dafny.Rune> _1041___mcc_h272 = _source28.dtor_name;
+          RAST._IExpr _1042___mcc_h273 = _source28.dtor_rhs;
+          return this;
+        } else if (_source28.is_IfExpr) {
+          RAST._IExpr _1043___mcc_h276 = _source28.dtor_cond;
+          RAST._IExpr _1044___mcc_h277 = _source28.dtor_thn;
+          RAST._IExpr _1045___mcc_h278 = _source28.dtor_els;
+          return this;
+        } else if (_source28.is_Loop) {
+          Std.Wrappers._IOption<RAST._IExpr> _1046___mcc_h282 = _source28.dtor_optCond;
+          RAST._IExpr _1047___mcc_h283 = _source28.dtor_underlying;
+          return this;
+        } else if (_source28.is_For) {
+          Dafny.ISequence<Dafny.Rune> _1048___mcc_h286 = _source28.dtor_name;
+          RAST._IExpr _1049___mcc_h287 = _source28.dtor_range;
+          RAST._IExpr _1050___mcc_h288 = _source28.dtor_body;
+          return this;
+        } else if (_source28.is_Labelled) {
+          Dafny.ISequence<Dafny.Rune> _1051___mcc_h292 = _source28.dtor_lbl;
+          RAST._IExpr _1052___mcc_h293 = _source28.dtor_underlying;
+          return this;
+        } else if (_source28.is_Break) {
+          Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1053___mcc_h296 = _source28.dtor_optLbl;
+          return this;
+        } else if (_source28.is_Continue) {
+          Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1054___mcc_h298 = _source28.dtor_optLbl;
+          return this;
+        } else if (_source28.is_Return) {
+          Std.Wrappers._IOption<RAST._IExpr> _1055___mcc_h300 = _source28.dtor_optExpr;
+          return this;
+        } else if (_source28.is_Call) {
+          RAST._IExpr _1056___mcc_h302 = _source28.dtor_obj;
+          Dafny.ISequence<RAST._IType> _1057___mcc_h303 = _source28.dtor_typeParameters;
+          Dafny.ISequence<RAST._IExpr> _1058___mcc_h304 = _source28.dtor_arguments;
+          return this;
+        } else if (_source28.is_Select) {
+          RAST._IExpr _1059___mcc_h308 = _source28.dtor_obj;
+          Dafny.ISequence<Dafny.Rune> _1060___mcc_h309 = _source28.dtor_name;
+          return this;
+        } else {
+          RAST._IExpr _1061___mcc_h312 = _source28.dtor_obj;
+          Dafny.ISequence<Dafny.Rune> _1062___mcc_h313 = _source28.dtor_name;
+          return this;
+        }
+      } else if (_source27.is_Block) {
+        RAST._IExpr _1063___mcc_h316 = _source27.dtor_underlying;
+        return this;
+      } else if (_source27.is_StructBuild) {
+        Dafny.ISequence<Dafny.Rune> _1064___mcc_h318 = _source27.dtor_name;
+        Dafny.ISequence<RAST._IAssignIdentifier> _1065___mcc_h319 = _source27.dtor_assignments;
+        return this;
+      } else if (_source27.is_Tuple) {
+        Dafny.ISequence<RAST._IExpr> _1066___mcc_h322 = _source27.dtor_arguments;
+        return this;
+      } else if (_source27.is_UnaryOp) {
+        Dafny.ISequence<Dafny.Rune> _1067___mcc_h324 = _source27.dtor_op1;
+        RAST._IExpr _1068___mcc_h325 = _source27.dtor_underlying;
+        DAST.Format._IUnaryOpFormat _1069___mcc_h326 = _source27.dtor_format;
+        if (object.Equals(_1067___mcc_h324, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"))) {
+          RAST._IExpr _source33 = _1068___mcc_h325;
+          if (_source33.is_RawExpr) {
+            Dafny.ISequence<Dafny.Rune> _1070___mcc_h330 = _source33.dtor_content;
+            return this;
+          } else if (_source33.is_Identifier) {
+            Dafny.ISequence<Dafny.Rune> _1071___mcc_h332 = _source33.dtor_name;
+            return this;
+          } else if (_source33.is_Match) {
+            RAST._IExpr _1072___mcc_h334 = _source33.dtor_matchee;
+            Dafny.ISequence<RAST._IMatchCase> _1073___mcc_h335 = _source33.dtor_cases;
+            return this;
+          } else if (_source33.is_StmtExpr) {
+            RAST._IExpr _1074___mcc_h338 = _source33.dtor_stmt;
+            RAST._IExpr _1075___mcc_h339 = _source33.dtor_rhs;
+            return this;
+          } else if (_source33.is_Block) {
+            RAST._IExpr _1076___mcc_h342 = _source33.dtor_underlying;
+            return this;
+          } else if (_source33.is_StructBuild) {
+            Dafny.ISequence<Dafny.Rune> _1077___mcc_h344 = _source33.dtor_name;
+            Dafny.ISequence<RAST._IAssignIdentifier> _1078___mcc_h345 = _source33.dtor_assignments;
+            return this;
+          } else if (_source33.is_Tuple) {
+            Dafny.ISequence<RAST._IExpr> _1079___mcc_h348 = _source33.dtor_arguments;
+            return this;
+          } else if (_source33.is_UnaryOp) {
+            Dafny.ISequence<Dafny.Rune> _1080___mcc_h350 = _source33.dtor_op1;
+            RAST._IExpr _1081___mcc_h351 = _source33.dtor_underlying;
+            DAST.Format._IUnaryOpFormat _1082___mcc_h352 = _source33.dtor_format;
+            return this;
+          } else if (_source33.is_BinaryOp) {
+            Dafny.ISequence<Dafny.Rune> _1083___mcc_h356 = _source33.dtor_op2;
+            RAST._IExpr _1084___mcc_h357 = _source33.dtor_left;
+            RAST._IExpr _1085___mcc_h358 = _source33.dtor_right;
+            DAST.Format._IBinaryOpFormat _1086___mcc_h359 = _source33.dtor_format2;
+            return this;
+          } else if (_source33.is_TypeAscription) {
+            RAST._IExpr _1087___mcc_h364 = _source33.dtor_left;
+            RAST._IType _1088___mcc_h365 = _source33.dtor_tpe;
+            return this;
+          } else if (_source33.is_LiteralInt) {
+            Dafny.ISequence<Dafny.Rune> _1089___mcc_h368 = _source33.dtor_value;
+            return this;
+          } else if (_source33.is_LiteralString) {
+            Dafny.ISequence<Dafny.Rune> _1090___mcc_h370 = _source33.dtor_value;
+            bool _1091___mcc_h371 = _source33.dtor_binary;
+            return this;
+          } else if (_source33.is_ConversionNum) {
+            RAST._IType _1092___mcc_h374 = _source33.dtor_tpe;
+            RAST._IExpr _1093___mcc_h375 = _source33.dtor_underlying;
+            return this;
+          } else if (_source33.is_DeclareVar) {
+            RAST._IDeclareType _1094___mcc_h378 = _source33.dtor_declareType;
+            Dafny.ISequence<Dafny.Rune> _1095___mcc_h379 = _source33.dtor_name;
+            Std.Wrappers._IOption<RAST._IType> _1096___mcc_h380 = _source33.dtor_optType;
+            Std.Wrappers._IOption<RAST._IExpr> _1097___mcc_h381 = _source33.dtor_optRhs;
+            return this;
+          } else if (_source33.is_AssignVar) {
+            Dafny.ISequence<Dafny.Rune> _1098___mcc_h386 = _source33.dtor_name;
+            RAST._IExpr _1099___mcc_h387 = _source33.dtor_rhs;
+            return this;
+          } else if (_source33.is_IfExpr) {
+            RAST._IExpr _1100___mcc_h390 = _source33.dtor_cond;
+            RAST._IExpr _1101___mcc_h391 = _source33.dtor_thn;
+            RAST._IExpr _1102___mcc_h392 = _source33.dtor_els;
+            return this;
+          } else if (_source33.is_Loop) {
+            Std.Wrappers._IOption<RAST._IExpr> _1103___mcc_h396 = _source33.dtor_optCond;
+            RAST._IExpr _1104___mcc_h397 = _source33.dtor_underlying;
+            return this;
+          } else if (_source33.is_For) {
+            Dafny.ISequence<Dafny.Rune> _1105___mcc_h400 = _source33.dtor_name;
+            RAST._IExpr _1106___mcc_h401 = _source33.dtor_range;
+            RAST._IExpr _1107___mcc_h402 = _source33.dtor_body;
+            return this;
+          } else if (_source33.is_Labelled) {
+            Dafny.ISequence<Dafny.Rune> _1108___mcc_h406 = _source33.dtor_lbl;
+            RAST._IExpr _1109___mcc_h407 = _source33.dtor_underlying;
+            return this;
+          } else if (_source33.is_Break) {
+            Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1110___mcc_h410 = _source33.dtor_optLbl;
+            return this;
+          } else if (_source33.is_Continue) {
+            Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1111___mcc_h412 = _source33.dtor_optLbl;
+            return this;
+          } else if (_source33.is_Return) {
+            Std.Wrappers._IOption<RAST._IExpr> _1112___mcc_h414 = _source33.dtor_optExpr;
+            return this;
+          } else if (_source33.is_Call) {
+            RAST._IExpr _1113___mcc_h416 = _source33.dtor_obj;
+            Dafny.ISequence<RAST._IType> _1114___mcc_h417 = _source33.dtor_typeParameters;
+            Dafny.ISequence<RAST._IExpr> _1115___mcc_h418 = _source33.dtor_arguments;
+            RAST._IExpr _source34 = _1113___mcc_h416;
+            if (_source34.is_RawExpr) {
+              Dafny.ISequence<Dafny.Rune> _1116___mcc_h422 = _source34.dtor_content;
+              return this;
+            } else if (_source34.is_Identifier) {
+              Dafny.ISequence<Dafny.Rune> _1117___mcc_h424 = _source34.dtor_name;
+              return this;
+            } else if (_source34.is_Match) {
+              RAST._IExpr _1118___mcc_h426 = _source34.dtor_matchee;
+              Dafny.ISequence<RAST._IMatchCase> _1119___mcc_h427 = _source34.dtor_cases;
+              return this;
+            } else if (_source34.is_StmtExpr) {
+              RAST._IExpr _1120___mcc_h430 = _source34.dtor_stmt;
+              RAST._IExpr _1121___mcc_h431 = _source34.dtor_rhs;
+              return this;
+            } else if (_source34.is_Block) {
+              RAST._IExpr _1122___mcc_h434 = _source34.dtor_underlying;
+              return this;
+            } else if (_source34.is_StructBuild) {
+              Dafny.ISequence<Dafny.Rune> _1123___mcc_h436 = _source34.dtor_name;
+              Dafny.ISequence<RAST._IAssignIdentifier> _1124___mcc_h437 = _source34.dtor_assignments;
+              return this;
+            } else if (_source34.is_Tuple) {
+              Dafny.ISequence<RAST._IExpr> _1125___mcc_h440 = _source34.dtor_arguments;
+              return this;
+            } else if (_source34.is_UnaryOp) {
+              Dafny.ISequence<Dafny.Rune> _1126___mcc_h442 = _source34.dtor_op1;
+              RAST._IExpr _1127___mcc_h443 = _source34.dtor_underlying;
+              DAST.Format._IUnaryOpFormat _1128___mcc_h444 = _source34.dtor_format;
+              return this;
+            } else if (_source34.is_BinaryOp) {
+              Dafny.ISequence<Dafny.Rune> _1129___mcc_h448 = _source34.dtor_op2;
+              RAST._IExpr _1130___mcc_h449 = _source34.dtor_left;
+              RAST._IExpr _1131___mcc_h450 = _source34.dtor_right;
+              DAST.Format._IBinaryOpFormat _1132___mcc_h451 = _source34.dtor_format2;
+              return this;
+            } else if (_source34.is_TypeAscription) {
+              RAST._IExpr _1133___mcc_h456 = _source34.dtor_left;
+              RAST._IType _1134___mcc_h457 = _source34.dtor_tpe;
+              return this;
+            } else if (_source34.is_LiteralInt) {
+              Dafny.ISequence<Dafny.Rune> _1135___mcc_h460 = _source34.dtor_value;
+              return this;
+            } else if (_source34.is_LiteralString) {
+              Dafny.ISequence<Dafny.Rune> _1136___mcc_h462 = _source34.dtor_value;
+              bool _1137___mcc_h463 = _source34.dtor_binary;
+              return this;
+            } else if (_source34.is_ConversionNum) {
+              RAST._IType _1138___mcc_h466 = _source34.dtor_tpe;
+              RAST._IExpr _1139___mcc_h467 = _source34.dtor_underlying;
+              return this;
+            } else if (_source34.is_DeclareVar) {
+              RAST._IDeclareType _1140___mcc_h470 = _source34.dtor_declareType;
+              Dafny.ISequence<Dafny.Rune> _1141___mcc_h471 = _source34.dtor_name;
+              Std.Wrappers._IOption<RAST._IType> _1142___mcc_h472 = _source34.dtor_optType;
+              Std.Wrappers._IOption<RAST._IExpr> _1143___mcc_h473 = _source34.dtor_optRhs;
+              return this;
+            } else if (_source34.is_AssignVar) {
+              Dafny.ISequence<Dafny.Rune> _1144___mcc_h478 = _source34.dtor_name;
+              RAST._IExpr _1145___mcc_h479 = _source34.dtor_rhs;
+              return this;
+            } else if (_source34.is_IfExpr) {
+              RAST._IExpr _1146___mcc_h482 = _source34.dtor_cond;
+              RAST._IExpr _1147___mcc_h483 = _source34.dtor_thn;
+              RAST._IExpr _1148___mcc_h484 = _source34.dtor_els;
+              return this;
+            } else if (_source34.is_Loop) {
+              Std.Wrappers._IOption<RAST._IExpr> _1149___mcc_h488 = _source34.dtor_optCond;
+              RAST._IExpr _1150___mcc_h489 = _source34.dtor_underlying;
+              return this;
+            } else if (_source34.is_For) {
+              Dafny.ISequence<Dafny.Rune> _1151___mcc_h492 = _source34.dtor_name;
+              RAST._IExpr _1152___mcc_h493 = _source34.dtor_range;
+              RAST._IExpr _1153___mcc_h494 = _source34.dtor_body;
+              return this;
+            } else if (_source34.is_Labelled) {
+              Dafny.ISequence<Dafny.Rune> _1154___mcc_h498 = _source34.dtor_lbl;
+              RAST._IExpr _1155___mcc_h499 = _source34.dtor_underlying;
+              return this;
+            } else if (_source34.is_Break) {
+              Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1156___mcc_h502 = _source34.dtor_optLbl;
+              return this;
+            } else if (_source34.is_Continue) {
+              Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1157___mcc_h504 = _source34.dtor_optLbl;
+              return this;
+            } else if (_source34.is_Return) {
+              Std.Wrappers._IOption<RAST._IExpr> _1158___mcc_h506 = _source34.dtor_optExpr;
+              return this;
+            } else if (_source34.is_Call) {
+              RAST._IExpr _1159___mcc_h508 = _source34.dtor_obj;
+              Dafny.ISequence<RAST._IType> _1160___mcc_h509 = _source34.dtor_typeParameters;
+              Dafny.ISequence<RAST._IExpr> _1161___mcc_h510 = _source34.dtor_arguments;
+              return this;
+            } else if (_source34.is_Select) {
+              RAST._IExpr _1162___mcc_h514 = _source34.dtor_obj;
+              Dafny.ISequence<Dafny.Rune> _1163___mcc_h515 = _source34.dtor_name;
+              if (object.Equals(_1163___mcc_h515, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("clone"))) {
+                DAST.Format._IUnaryOpFormat _1164_format = _1069___mcc_h326;
+                Dafny.ISequence<RAST._IExpr> _1165_args = _1115___mcc_h418;
+                Dafny.ISequence<RAST._IType> _1166_typeArgs = _1114___mcc_h417;
+                RAST._IExpr _1167_underlying = _1162___mcc_h514;
+                if (((_1166_typeArgs).Equals(Dafny.Sequence<RAST._IType>.FromElements())) && ((_1165_args).Equals(Dafny.Sequence<RAST._IExpr>.FromElements()))) {
+                  return RAST.Expr.create_UnaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"), _1167_underlying, _1164_format);
+                } else {
+                  return this;
+                }
+              } else {
+                return this;
+              }
+            } else {
+              RAST._IExpr _1168___mcc_h518 = _source34.dtor_obj;
+              Dafny.ISequence<Dafny.Rune> _1169___mcc_h519 = _source34.dtor_name;
+              return this;
+            }
+          } else if (_source33.is_Select) {
+            RAST._IExpr _1170___mcc_h522 = _source33.dtor_obj;
+            Dafny.ISequence<Dafny.Rune> _1171___mcc_h523 = _source33.dtor_name;
+            return this;
+          } else {
+            RAST._IExpr _1172___mcc_h526 = _source33.dtor_obj;
+            Dafny.ISequence<Dafny.Rune> _1173___mcc_h527 = _source33.dtor_name;
+            return this;
+          }
+        } else if (object.Equals(_1067___mcc_h324, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!"))) {
+          RAST._IExpr _source35 = _1068___mcc_h325;
+          if (_source35.is_RawExpr) {
+            Dafny.ISequence<Dafny.Rune> _1174___mcc_h530 = _source35.dtor_content;
+            return this;
+          } else if (_source35.is_Identifier) {
+            Dafny.ISequence<Dafny.Rune> _1175___mcc_h532 = _source35.dtor_name;
+            return this;
+          } else if (_source35.is_Match) {
+            RAST._IExpr _1176___mcc_h534 = _source35.dtor_matchee;
+            Dafny.ISequence<RAST._IMatchCase> _1177___mcc_h535 = _source35.dtor_cases;
+            return this;
+          } else if (_source35.is_StmtExpr) {
+            RAST._IExpr _1178___mcc_h538 = _source35.dtor_stmt;
+            RAST._IExpr _1179___mcc_h539 = _source35.dtor_rhs;
+            return this;
+          } else if (_source35.is_Block) {
+            RAST._IExpr _1180___mcc_h542 = _source35.dtor_underlying;
+            return this;
+          } else if (_source35.is_StructBuild) {
+            Dafny.ISequence<Dafny.Rune> _1181___mcc_h544 = _source35.dtor_name;
+            Dafny.ISequence<RAST._IAssignIdentifier> _1182___mcc_h545 = _source35.dtor_assignments;
+            return this;
+          } else if (_source35.is_Tuple) {
+            Dafny.ISequence<RAST._IExpr> _1183___mcc_h548 = _source35.dtor_arguments;
+            return this;
+          } else if (_source35.is_UnaryOp) {
+            Dafny.ISequence<Dafny.Rune> _1184___mcc_h550 = _source35.dtor_op1;
+            RAST._IExpr _1185___mcc_h551 = _source35.dtor_underlying;
+            DAST.Format._IUnaryOpFormat _1186___mcc_h552 = _source35.dtor_format;
+            return this;
+          } else if (_source35.is_BinaryOp) {
+            Dafny.ISequence<Dafny.Rune> _1187___mcc_h556 = _source35.dtor_op2;
+            RAST._IExpr _1188___mcc_h557 = _source35.dtor_left;
+            RAST._IExpr _1189___mcc_h558 = _source35.dtor_right;
+            DAST.Format._IBinaryOpFormat _1190___mcc_h559 = _source35.dtor_format2;
+            if (object.Equals(_1187___mcc_h556, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("=="))) {
+              DAST.Format._IUnaryOpFormat _source36 = _1069___mcc_h326;
+              if (_source36.is_NoFormat) {
+                return this;
+              } else {
+                DAST.Format._IBinaryOpFormat _1191_format = _1190___mcc_h559;
+                RAST._IExpr _1192_right = _1189___mcc_h558;
+                RAST._IExpr _1193_left = _1188___mcc_h557;
+                return RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!="), _1193_left, _1192_right, DAST.Format.BinaryOpFormat.create_NoFormat());
+              }
+            } else if (object.Equals(_1187___mcc_h556, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"))) {
+              DAST.Format._IBinaryOpFormat _source37 = _1190___mcc_h559;
+              if (_source37.is_NoFormat) {
+                DAST.Format._IUnaryOpFormat _source38 = _1069___mcc_h326;
+                if (_source38.is_NoFormat) {
+                  return this;
+                } else {
+                  RAST._IExpr _1194_right = _1189___mcc_h558;
+                  RAST._IExpr _1195_left = _1188___mcc_h557;
+                  return RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">="), _1195_left, _1194_right, DAST.Format.BinaryOpFormat.create_NoFormat());
+                }
+              } else if (_source37.is_ImpliesFormat) {
+                return this;
+              } else if (_source37.is_EquivalenceFormat) {
+                return this;
+              } else {
+                DAST.Format._IUnaryOpFormat _source39 = _1069___mcc_h326;
+                if (_source39.is_NoFormat) {
+                  return this;
+                } else {
+                  RAST._IExpr _1196_right = _1189___mcc_h558;
+                  RAST._IExpr _1197_left = _1188___mcc_h557;
+                  return RAST.Expr.create_BinaryOp(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<="), _1196_right, _1197_left, DAST.Format.BinaryOpFormat.create_NoFormat());
+                }
+              }
+            } else {
+              return this;
+            }
+          } else if (_source35.is_TypeAscription) {
+            RAST._IExpr _1198___mcc_h564 = _source35.dtor_left;
+            RAST._IType _1199___mcc_h565 = _source35.dtor_tpe;
+            return this;
+          } else if (_source35.is_LiteralInt) {
+            Dafny.ISequence<Dafny.Rune> _1200___mcc_h568 = _source35.dtor_value;
+            return this;
+          } else if (_source35.is_LiteralString) {
+            Dafny.ISequence<Dafny.Rune> _1201___mcc_h570 = _source35.dtor_value;
+            bool _1202___mcc_h571 = _source35.dtor_binary;
+            return this;
+          } else if (_source35.is_ConversionNum) {
+            RAST._IType _1203___mcc_h574 = _source35.dtor_tpe;
+            RAST._IExpr _1204___mcc_h575 = _source35.dtor_underlying;
+            return this;
+          } else if (_source35.is_DeclareVar) {
+            RAST._IDeclareType _1205___mcc_h578 = _source35.dtor_declareType;
+            Dafny.ISequence<Dafny.Rune> _1206___mcc_h579 = _source35.dtor_name;
+            Std.Wrappers._IOption<RAST._IType> _1207___mcc_h580 = _source35.dtor_optType;
+            Std.Wrappers._IOption<RAST._IExpr> _1208___mcc_h581 = _source35.dtor_optRhs;
+            return this;
+          } else if (_source35.is_AssignVar) {
+            Dafny.ISequence<Dafny.Rune> _1209___mcc_h586 = _source35.dtor_name;
+            RAST._IExpr _1210___mcc_h587 = _source35.dtor_rhs;
+            return this;
+          } else if (_source35.is_IfExpr) {
+            RAST._IExpr _1211___mcc_h590 = _source35.dtor_cond;
+            RAST._IExpr _1212___mcc_h591 = _source35.dtor_thn;
+            RAST._IExpr _1213___mcc_h592 = _source35.dtor_els;
+            return this;
+          } else if (_source35.is_Loop) {
+            Std.Wrappers._IOption<RAST._IExpr> _1214___mcc_h596 = _source35.dtor_optCond;
+            RAST._IExpr _1215___mcc_h597 = _source35.dtor_underlying;
+            return this;
+          } else if (_source35.is_For) {
+            Dafny.ISequence<Dafny.Rune> _1216___mcc_h600 = _source35.dtor_name;
+            RAST._IExpr _1217___mcc_h601 = _source35.dtor_range;
+            RAST._IExpr _1218___mcc_h602 = _source35.dtor_body;
+            return this;
+          } else if (_source35.is_Labelled) {
+            Dafny.ISequence<Dafny.Rune> _1219___mcc_h606 = _source35.dtor_lbl;
+            RAST._IExpr _1220___mcc_h607 = _source35.dtor_underlying;
+            return this;
+          } else if (_source35.is_Break) {
+            Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1221___mcc_h610 = _source35.dtor_optLbl;
+            return this;
+          } else if (_source35.is_Continue) {
+            Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1222___mcc_h612 = _source35.dtor_optLbl;
+            return this;
+          } else if (_source35.is_Return) {
+            Std.Wrappers._IOption<RAST._IExpr> _1223___mcc_h614 = _source35.dtor_optExpr;
+            return this;
+          } else if (_source35.is_Call) {
+            RAST._IExpr _1224___mcc_h616 = _source35.dtor_obj;
+            Dafny.ISequence<RAST._IType> _1225___mcc_h617 = _source35.dtor_typeParameters;
+            Dafny.ISequence<RAST._IExpr> _1226___mcc_h618 = _source35.dtor_arguments;
+            return this;
+          } else if (_source35.is_Select) {
+            RAST._IExpr _1227___mcc_h622 = _source35.dtor_obj;
+            Dafny.ISequence<Dafny.Rune> _1228___mcc_h623 = _source35.dtor_name;
+            return this;
+          } else {
+            RAST._IExpr _1229___mcc_h626 = _source35.dtor_obj;
+            Dafny.ISequence<Dafny.Rune> _1230___mcc_h627 = _source35.dtor_name;
+            return this;
+          }
+        } else {
+          return this;
+        }
+      } else if (_source27.is_BinaryOp) {
+        Dafny.ISequence<Dafny.Rune> _1231___mcc_h630 = _source27.dtor_op2;
+        RAST._IExpr _1232___mcc_h631 = _source27.dtor_left;
+        RAST._IExpr _1233___mcc_h632 = _source27.dtor_right;
+        DAST.Format._IBinaryOpFormat _1234___mcc_h633 = _source27.dtor_format2;
+        return this;
+      } else if (_source27.is_TypeAscription) {
+        RAST._IExpr _1235___mcc_h638 = _source27.dtor_left;
+        RAST._IType _1236___mcc_h639 = _source27.dtor_tpe;
+        return this;
+      } else if (_source27.is_LiteralInt) {
+        Dafny.ISequence<Dafny.Rune> _1237___mcc_h642 = _source27.dtor_value;
+        return this;
+      } else if (_source27.is_LiteralString) {
+        Dafny.ISequence<Dafny.Rune> _1238___mcc_h644 = _source27.dtor_value;
+        bool _1239___mcc_h645 = _source27.dtor_binary;
+        return this;
+      } else if (_source27.is_ConversionNum) {
+        RAST._IType _1240___mcc_h648 = _source27.dtor_tpe;
+        RAST._IExpr _1241___mcc_h649 = _source27.dtor_underlying;
+        RAST._IExpr _1242_expr = _1241___mcc_h649;
+        RAST._IType _1243_tpe = _1240___mcc_h648;
+        if (((((((((((_1243_tpe).is_U8) || ((_1243_tpe).is_U16)) || ((_1243_tpe).is_U32)) || ((_1243_tpe).is_U64)) || ((_1243_tpe).is_U128)) || ((_1243_tpe).is_I8)) || ((_1243_tpe).is_I16)) || ((_1243_tpe).is_I32)) || ((_1243_tpe).is_I64)) || ((_1243_tpe).is_I128)) {
+          RAST._IExpr _source40 = _1242_expr;
+          if (_source40.is_RawExpr) {
+            Dafny.ISequence<Dafny.Rune> _1244___mcc_h704 = _source40.dtor_content;
+            return this;
+          } else if (_source40.is_Identifier) {
+            Dafny.ISequence<Dafny.Rune> _1245___mcc_h706 = _source40.dtor_name;
+            return this;
+          } else if (_source40.is_Match) {
+            RAST._IExpr _1246___mcc_h708 = _source40.dtor_matchee;
+            Dafny.ISequence<RAST._IMatchCase> _1247___mcc_h709 = _source40.dtor_cases;
+            return this;
+          } else if (_source40.is_StmtExpr) {
+            RAST._IExpr _1248___mcc_h712 = _source40.dtor_stmt;
+            RAST._IExpr _1249___mcc_h713 = _source40.dtor_rhs;
+            return this;
+          } else if (_source40.is_Block) {
+            RAST._IExpr _1250___mcc_h716 = _source40.dtor_underlying;
+            return this;
+          } else if (_source40.is_StructBuild) {
+            Dafny.ISequence<Dafny.Rune> _1251___mcc_h718 = _source40.dtor_name;
+            Dafny.ISequence<RAST._IAssignIdentifier> _1252___mcc_h719 = _source40.dtor_assignments;
+            return this;
+          } else if (_source40.is_Tuple) {
+            Dafny.ISequence<RAST._IExpr> _1253___mcc_h722 = _source40.dtor_arguments;
+            return this;
+          } else if (_source40.is_UnaryOp) {
+            Dafny.ISequence<Dafny.Rune> _1254___mcc_h724 = _source40.dtor_op1;
+            RAST._IExpr _1255___mcc_h725 = _source40.dtor_underlying;
+            DAST.Format._IUnaryOpFormat _1256___mcc_h726 = _source40.dtor_format;
+            return this;
+          } else if (_source40.is_BinaryOp) {
+            Dafny.ISequence<Dafny.Rune> _1257___mcc_h730 = _source40.dtor_op2;
+            RAST._IExpr _1258___mcc_h731 = _source40.dtor_left;
+            RAST._IExpr _1259___mcc_h732 = _source40.dtor_right;
+            DAST.Format._IBinaryOpFormat _1260___mcc_h733 = _source40.dtor_format2;
+            return this;
+          } else if (_source40.is_TypeAscription) {
+            RAST._IExpr _1261___mcc_h738 = _source40.dtor_left;
+            RAST._IType _1262___mcc_h739 = _source40.dtor_tpe;
+            return this;
+          } else if (_source40.is_LiteralInt) {
+            Dafny.ISequence<Dafny.Rune> _1263___mcc_h742 = _source40.dtor_value;
+            return this;
+          } else if (_source40.is_LiteralString) {
+            Dafny.ISequence<Dafny.Rune> _1264___mcc_h744 = _source40.dtor_value;
+            bool _1265___mcc_h745 = _source40.dtor_binary;
+            return this;
+          } else if (_source40.is_ConversionNum) {
+            RAST._IType _1266___mcc_h748 = _source40.dtor_tpe;
+            RAST._IExpr _1267___mcc_h749 = _source40.dtor_underlying;
+            return this;
+          } else if (_source40.is_DeclareVar) {
+            RAST._IDeclareType _1268___mcc_h752 = _source40.dtor_declareType;
+            Dafny.ISequence<Dafny.Rune> _1269___mcc_h753 = _source40.dtor_name;
+            Std.Wrappers._IOption<RAST._IType> _1270___mcc_h754 = _source40.dtor_optType;
+            Std.Wrappers._IOption<RAST._IExpr> _1271___mcc_h755 = _source40.dtor_optRhs;
+            return this;
+          } else if (_source40.is_AssignVar) {
+            Dafny.ISequence<Dafny.Rune> _1272___mcc_h760 = _source40.dtor_name;
+            RAST._IExpr _1273___mcc_h761 = _source40.dtor_rhs;
+            return this;
+          } else if (_source40.is_IfExpr) {
+            RAST._IExpr _1274___mcc_h764 = _source40.dtor_cond;
+            RAST._IExpr _1275___mcc_h765 = _source40.dtor_thn;
+            RAST._IExpr _1276___mcc_h766 = _source40.dtor_els;
+            return this;
+          } else if (_source40.is_Loop) {
+            Std.Wrappers._IOption<RAST._IExpr> _1277___mcc_h770 = _source40.dtor_optCond;
+            RAST._IExpr _1278___mcc_h771 = _source40.dtor_underlying;
+            return this;
+          } else if (_source40.is_For) {
+            Dafny.ISequence<Dafny.Rune> _1279___mcc_h774 = _source40.dtor_name;
+            RAST._IExpr _1280___mcc_h775 = _source40.dtor_range;
+            RAST._IExpr _1281___mcc_h776 = _source40.dtor_body;
+            return this;
+          } else if (_source40.is_Labelled) {
+            Dafny.ISequence<Dafny.Rune> _1282___mcc_h780 = _source40.dtor_lbl;
+            RAST._IExpr _1283___mcc_h781 = _source40.dtor_underlying;
+            return this;
+          } else if (_source40.is_Break) {
+            Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1284___mcc_h784 = _source40.dtor_optLbl;
+            return this;
+          } else if (_source40.is_Continue) {
+            Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1285___mcc_h786 = _source40.dtor_optLbl;
+            return this;
+          } else if (_source40.is_Return) {
+            Std.Wrappers._IOption<RAST._IExpr> _1286___mcc_h788 = _source40.dtor_optExpr;
+            return this;
+          } else if (_source40.is_Call) {
+            RAST._IExpr _1287___mcc_h790 = _source40.dtor_obj;
+            Dafny.ISequence<RAST._IType> _1288___mcc_h791 = _source40.dtor_typeParameters;
+            Dafny.ISequence<RAST._IExpr> _1289___mcc_h792 = _source40.dtor_arguments;
+            RAST._IExpr _source41 = _1287___mcc_h790;
+            if (_source41.is_RawExpr) {
+              Dafny.ISequence<Dafny.Rune> _1290___mcc_h796 = _source41.dtor_content;
+              return this;
+            } else if (_source41.is_Identifier) {
+              Dafny.ISequence<Dafny.Rune> _1291___mcc_h798 = _source41.dtor_name;
+              return this;
+            } else if (_source41.is_Match) {
+              RAST._IExpr _1292___mcc_h800 = _source41.dtor_matchee;
+              Dafny.ISequence<RAST._IMatchCase> _1293___mcc_h801 = _source41.dtor_cases;
+              return this;
+            } else if (_source41.is_StmtExpr) {
+              RAST._IExpr _1294___mcc_h804 = _source41.dtor_stmt;
+              RAST._IExpr _1295___mcc_h805 = _source41.dtor_rhs;
+              return this;
+            } else if (_source41.is_Block) {
+              RAST._IExpr _1296___mcc_h808 = _source41.dtor_underlying;
+              return this;
+            } else if (_source41.is_StructBuild) {
+              Dafny.ISequence<Dafny.Rune> _1297___mcc_h810 = _source41.dtor_name;
+              Dafny.ISequence<RAST._IAssignIdentifier> _1298___mcc_h811 = _source41.dtor_assignments;
+              return this;
+            } else if (_source41.is_Tuple) {
+              Dafny.ISequence<RAST._IExpr> _1299___mcc_h814 = _source41.dtor_arguments;
+              return this;
+            } else if (_source41.is_UnaryOp) {
+              Dafny.ISequence<Dafny.Rune> _1300___mcc_h816 = _source41.dtor_op1;
+              RAST._IExpr _1301___mcc_h817 = _source41.dtor_underlying;
+              DAST.Format._IUnaryOpFormat _1302___mcc_h818 = _source41.dtor_format;
+              return this;
+            } else if (_source41.is_BinaryOp) {
+              Dafny.ISequence<Dafny.Rune> _1303___mcc_h822 = _source41.dtor_op2;
+              RAST._IExpr _1304___mcc_h823 = _source41.dtor_left;
+              RAST._IExpr _1305___mcc_h824 = _source41.dtor_right;
+              DAST.Format._IBinaryOpFormat _1306___mcc_h825 = _source41.dtor_format2;
+              return this;
+            } else if (_source41.is_TypeAscription) {
+              RAST._IExpr _1307___mcc_h830 = _source41.dtor_left;
+              RAST._IType _1308___mcc_h831 = _source41.dtor_tpe;
+              return this;
+            } else if (_source41.is_LiteralInt) {
+              Dafny.ISequence<Dafny.Rune> _1309___mcc_h834 = _source41.dtor_value;
+              return this;
+            } else if (_source41.is_LiteralString) {
+              Dafny.ISequence<Dafny.Rune> _1310___mcc_h836 = _source41.dtor_value;
+              bool _1311___mcc_h837 = _source41.dtor_binary;
+              return this;
+            } else if (_source41.is_ConversionNum) {
+              RAST._IType _1312___mcc_h840 = _source41.dtor_tpe;
+              RAST._IExpr _1313___mcc_h841 = _source41.dtor_underlying;
+              return this;
+            } else if (_source41.is_DeclareVar) {
+              RAST._IDeclareType _1314___mcc_h844 = _source41.dtor_declareType;
+              Dafny.ISequence<Dafny.Rune> _1315___mcc_h845 = _source41.dtor_name;
+              Std.Wrappers._IOption<RAST._IType> _1316___mcc_h846 = _source41.dtor_optType;
+              Std.Wrappers._IOption<RAST._IExpr> _1317___mcc_h847 = _source41.dtor_optRhs;
+              return this;
+            } else if (_source41.is_AssignVar) {
+              Dafny.ISequence<Dafny.Rune> _1318___mcc_h852 = _source41.dtor_name;
+              RAST._IExpr _1319___mcc_h853 = _source41.dtor_rhs;
+              return this;
+            } else if (_source41.is_IfExpr) {
+              RAST._IExpr _1320___mcc_h856 = _source41.dtor_cond;
+              RAST._IExpr _1321___mcc_h857 = _source41.dtor_thn;
+              RAST._IExpr _1322___mcc_h858 = _source41.dtor_els;
+              return this;
+            } else if (_source41.is_Loop) {
+              Std.Wrappers._IOption<RAST._IExpr> _1323___mcc_h862 = _source41.dtor_optCond;
+              RAST._IExpr _1324___mcc_h863 = _source41.dtor_underlying;
+              return this;
+            } else if (_source41.is_For) {
+              Dafny.ISequence<Dafny.Rune> _1325___mcc_h866 = _source41.dtor_name;
+              RAST._IExpr _1326___mcc_h867 = _source41.dtor_range;
+              RAST._IExpr _1327___mcc_h868 = _source41.dtor_body;
+              return this;
+            } else if (_source41.is_Labelled) {
+              Dafny.ISequence<Dafny.Rune> _1328___mcc_h872 = _source41.dtor_lbl;
+              RAST._IExpr _1329___mcc_h873 = _source41.dtor_underlying;
+              return this;
+            } else if (_source41.is_Break) {
+              Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1330___mcc_h876 = _source41.dtor_optLbl;
+              return this;
+            } else if (_source41.is_Continue) {
+              Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1331___mcc_h878 = _source41.dtor_optLbl;
+              return this;
+            } else if (_source41.is_Return) {
+              Std.Wrappers._IOption<RAST._IExpr> _1332___mcc_h880 = _source41.dtor_optExpr;
+              return this;
+            } else if (_source41.is_Call) {
+              RAST._IExpr _1333___mcc_h882 = _source41.dtor_obj;
+              Dafny.ISequence<RAST._IType> _1334___mcc_h883 = _source41.dtor_typeParameters;
+              Dafny.ISequence<RAST._IExpr> _1335___mcc_h884 = _source41.dtor_arguments;
+              return this;
+            } else if (_source41.is_Select) {
+              RAST._IExpr _1336___mcc_h888 = _source41.dtor_obj;
+              Dafny.ISequence<Dafny.Rune> _1337___mcc_h889 = _source41.dtor_name;
+              return this;
+            } else {
+              RAST._IExpr _1338___mcc_h892 = _source41.dtor_obj;
+              Dafny.ISequence<Dafny.Rune> _1339___mcc_h893 = _source41.dtor_name;
+              RAST._IExpr _source42 = _1338___mcc_h892;
+              if (_source42.is_RawExpr) {
+                Dafny.ISequence<Dafny.Rune> _1340___mcc_h896 = _source42.dtor_content;
+                return this;
+              } else if (_source42.is_Identifier) {
+                Dafny.ISequence<Dafny.Rune> _1341___mcc_h898 = _source42.dtor_name;
+                return this;
+              } else if (_source42.is_Match) {
+                RAST._IExpr _1342___mcc_h900 = _source42.dtor_matchee;
+                Dafny.ISequence<RAST._IMatchCase> _1343___mcc_h901 = _source42.dtor_cases;
+                return this;
+              } else if (_source42.is_StmtExpr) {
+                RAST._IExpr _1344___mcc_h904 = _source42.dtor_stmt;
+                RAST._IExpr _1345___mcc_h905 = _source42.dtor_rhs;
+                return this;
+              } else if (_source42.is_Block) {
+                RAST._IExpr _1346___mcc_h908 = _source42.dtor_underlying;
+                return this;
+              } else if (_source42.is_StructBuild) {
+                Dafny.ISequence<Dafny.Rune> _1347___mcc_h910 = _source42.dtor_name;
+                Dafny.ISequence<RAST._IAssignIdentifier> _1348___mcc_h911 = _source42.dtor_assignments;
+                return this;
+              } else if (_source42.is_Tuple) {
+                Dafny.ISequence<RAST._IExpr> _1349___mcc_h914 = _source42.dtor_arguments;
+                return this;
+              } else if (_source42.is_UnaryOp) {
+                Dafny.ISequence<Dafny.Rune> _1350___mcc_h916 = _source42.dtor_op1;
+                RAST._IExpr _1351___mcc_h917 = _source42.dtor_underlying;
+                DAST.Format._IUnaryOpFormat _1352___mcc_h918 = _source42.dtor_format;
+                return this;
+              } else if (_source42.is_BinaryOp) {
+                Dafny.ISequence<Dafny.Rune> _1353___mcc_h922 = _source42.dtor_op2;
+                RAST._IExpr _1354___mcc_h923 = _source42.dtor_left;
+                RAST._IExpr _1355___mcc_h924 = _source42.dtor_right;
+                DAST.Format._IBinaryOpFormat _1356___mcc_h925 = _source42.dtor_format2;
+                return this;
+              } else if (_source42.is_TypeAscription) {
+                RAST._IExpr _1357___mcc_h930 = _source42.dtor_left;
+                RAST._IType _1358___mcc_h931 = _source42.dtor_tpe;
+                return this;
+              } else if (_source42.is_LiteralInt) {
+                Dafny.ISequence<Dafny.Rune> _1359___mcc_h934 = _source42.dtor_value;
+                return this;
+              } else if (_source42.is_LiteralString) {
+                Dafny.ISequence<Dafny.Rune> _1360___mcc_h936 = _source42.dtor_value;
+                bool _1361___mcc_h937 = _source42.dtor_binary;
+                return this;
+              } else if (_source42.is_ConversionNum) {
+                RAST._IType _1362___mcc_h940 = _source42.dtor_tpe;
+                RAST._IExpr _1363___mcc_h941 = _source42.dtor_underlying;
+                return this;
+              } else if (_source42.is_DeclareVar) {
+                RAST._IDeclareType _1364___mcc_h944 = _source42.dtor_declareType;
+                Dafny.ISequence<Dafny.Rune> _1365___mcc_h945 = _source42.dtor_name;
+                Std.Wrappers._IOption<RAST._IType> _1366___mcc_h946 = _source42.dtor_optType;
+                Std.Wrappers._IOption<RAST._IExpr> _1367___mcc_h947 = _source42.dtor_optRhs;
+                return this;
+              } else if (_source42.is_AssignVar) {
+                Dafny.ISequence<Dafny.Rune> _1368___mcc_h952 = _source42.dtor_name;
+                RAST._IExpr _1369___mcc_h953 = _source42.dtor_rhs;
+                return this;
+              } else if (_source42.is_IfExpr) {
+                RAST._IExpr _1370___mcc_h956 = _source42.dtor_cond;
+                RAST._IExpr _1371___mcc_h957 = _source42.dtor_thn;
+                RAST._IExpr _1372___mcc_h958 = _source42.dtor_els;
+                return this;
+              } else if (_source42.is_Loop) {
+                Std.Wrappers._IOption<RAST._IExpr> _1373___mcc_h962 = _source42.dtor_optCond;
+                RAST._IExpr _1374___mcc_h963 = _source42.dtor_underlying;
+                return this;
+              } else if (_source42.is_For) {
+                Dafny.ISequence<Dafny.Rune> _1375___mcc_h966 = _source42.dtor_name;
+                RAST._IExpr _1376___mcc_h967 = _source42.dtor_range;
+                RAST._IExpr _1377___mcc_h968 = _source42.dtor_body;
+                return this;
+              } else if (_source42.is_Labelled) {
+                Dafny.ISequence<Dafny.Rune> _1378___mcc_h972 = _source42.dtor_lbl;
+                RAST._IExpr _1379___mcc_h973 = _source42.dtor_underlying;
+                return this;
+              } else if (_source42.is_Break) {
+                Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1380___mcc_h976 = _source42.dtor_optLbl;
+                return this;
+              } else if (_source42.is_Continue) {
+                Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1381___mcc_h978 = _source42.dtor_optLbl;
+                return this;
+              } else if (_source42.is_Return) {
+                Std.Wrappers._IOption<RAST._IExpr> _1382___mcc_h980 = _source42.dtor_optExpr;
+                return this;
+              } else if (_source42.is_Call) {
+                RAST._IExpr _1383___mcc_h982 = _source42.dtor_obj;
+                Dafny.ISequence<RAST._IType> _1384___mcc_h983 = _source42.dtor_typeParameters;
+                Dafny.ISequence<RAST._IExpr> _1385___mcc_h984 = _source42.dtor_arguments;
+                return this;
+              } else if (_source42.is_Select) {
+                RAST._IExpr _1386___mcc_h988 = _source42.dtor_obj;
+                Dafny.ISequence<Dafny.Rune> _1387___mcc_h989 = _source42.dtor_name;
+                return this;
+              } else {
+                RAST._IExpr _1388___mcc_h992 = _source42.dtor_obj;
+                Dafny.ISequence<Dafny.Rune> _1389___mcc_h993 = _source42.dtor_name;
+                RAST._IExpr _source43 = _1388___mcc_h992;
+                if (_source43.is_RawExpr) {
+                  Dafny.ISequence<Dafny.Rune> _1390___mcc_h996 = _source43.dtor_content;
+                  return this;
+                } else if (_source43.is_Identifier) {
+                  Dafny.ISequence<Dafny.Rune> _1391___mcc_h998 = _source43.dtor_name;
+                  return this;
+                } else if (_source43.is_Match) {
+                  RAST._IExpr _1392___mcc_h1000 = _source43.dtor_matchee;
+                  Dafny.ISequence<RAST._IMatchCase> _1393___mcc_h1001 = _source43.dtor_cases;
+                  return this;
+                } else if (_source43.is_StmtExpr) {
+                  RAST._IExpr _1394___mcc_h1004 = _source43.dtor_stmt;
+                  RAST._IExpr _1395___mcc_h1005 = _source43.dtor_rhs;
+                  return this;
+                } else if (_source43.is_Block) {
+                  RAST._IExpr _1396___mcc_h1008 = _source43.dtor_underlying;
+                  return this;
+                } else if (_source43.is_StructBuild) {
+                  Dafny.ISequence<Dafny.Rune> _1397___mcc_h1010 = _source43.dtor_name;
+                  Dafny.ISequence<RAST._IAssignIdentifier> _1398___mcc_h1011 = _source43.dtor_assignments;
+                  return this;
+                } else if (_source43.is_Tuple) {
+                  Dafny.ISequence<RAST._IExpr> _1399___mcc_h1014 = _source43.dtor_arguments;
+                  return this;
+                } else if (_source43.is_UnaryOp) {
+                  Dafny.ISequence<Dafny.Rune> _1400___mcc_h1016 = _source43.dtor_op1;
+                  RAST._IExpr _1401___mcc_h1017 = _source43.dtor_underlying;
+                  DAST.Format._IUnaryOpFormat _1402___mcc_h1018 = _source43.dtor_format;
+                  return this;
+                } else if (_source43.is_BinaryOp) {
+                  Dafny.ISequence<Dafny.Rune> _1403___mcc_h1022 = _source43.dtor_op2;
+                  RAST._IExpr _1404___mcc_h1023 = _source43.dtor_left;
+                  RAST._IExpr _1405___mcc_h1024 = _source43.dtor_right;
+                  DAST.Format._IBinaryOpFormat _1406___mcc_h1025 = _source43.dtor_format2;
+                  return this;
+                } else if (_source43.is_TypeAscription) {
+                  RAST._IExpr _1407___mcc_h1030 = _source43.dtor_left;
+                  RAST._IType _1408___mcc_h1031 = _source43.dtor_tpe;
+                  return this;
+                } else if (_source43.is_LiteralInt) {
+                  Dafny.ISequence<Dafny.Rune> _1409___mcc_h1034 = _source43.dtor_value;
+                  return this;
+                } else if (_source43.is_LiteralString) {
+                  Dafny.ISequence<Dafny.Rune> _1410___mcc_h1036 = _source43.dtor_value;
+                  bool _1411___mcc_h1037 = _source43.dtor_binary;
+                  return this;
+                } else if (_source43.is_ConversionNum) {
+                  RAST._IType _1412___mcc_h1040 = _source43.dtor_tpe;
+                  RAST._IExpr _1413___mcc_h1041 = _source43.dtor_underlying;
+                  return this;
+                } else if (_source43.is_DeclareVar) {
+                  RAST._IDeclareType _1414___mcc_h1044 = _source43.dtor_declareType;
+                  Dafny.ISequence<Dafny.Rune> _1415___mcc_h1045 = _source43.dtor_name;
+                  Std.Wrappers._IOption<RAST._IType> _1416___mcc_h1046 = _source43.dtor_optType;
+                  Std.Wrappers._IOption<RAST._IExpr> _1417___mcc_h1047 = _source43.dtor_optRhs;
+                  return this;
+                } else if (_source43.is_AssignVar) {
+                  Dafny.ISequence<Dafny.Rune> _1418___mcc_h1052 = _source43.dtor_name;
+                  RAST._IExpr _1419___mcc_h1053 = _source43.dtor_rhs;
+                  return this;
+                } else if (_source43.is_IfExpr) {
+                  RAST._IExpr _1420___mcc_h1056 = _source43.dtor_cond;
+                  RAST._IExpr _1421___mcc_h1057 = _source43.dtor_thn;
+                  RAST._IExpr _1422___mcc_h1058 = _source43.dtor_els;
+                  return this;
+                } else if (_source43.is_Loop) {
+                  Std.Wrappers._IOption<RAST._IExpr> _1423___mcc_h1062 = _source43.dtor_optCond;
+                  RAST._IExpr _1424___mcc_h1063 = _source43.dtor_underlying;
+                  return this;
+                } else if (_source43.is_For) {
+                  Dafny.ISequence<Dafny.Rune> _1425___mcc_h1066 = _source43.dtor_name;
+                  RAST._IExpr _1426___mcc_h1067 = _source43.dtor_range;
+                  RAST._IExpr _1427___mcc_h1068 = _source43.dtor_body;
+                  return this;
+                } else if (_source43.is_Labelled) {
+                  Dafny.ISequence<Dafny.Rune> _1428___mcc_h1072 = _source43.dtor_lbl;
+                  RAST._IExpr _1429___mcc_h1073 = _source43.dtor_underlying;
+                  return this;
+                } else if (_source43.is_Break) {
+                  Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1430___mcc_h1076 = _source43.dtor_optLbl;
+                  return this;
+                } else if (_source43.is_Continue) {
+                  Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1431___mcc_h1078 = _source43.dtor_optLbl;
+                  return this;
+                } else if (_source43.is_Return) {
+                  Std.Wrappers._IOption<RAST._IExpr> _1432___mcc_h1080 = _source43.dtor_optExpr;
+                  return this;
+                } else if (_source43.is_Call) {
+                  RAST._IExpr _1433___mcc_h1082 = _source43.dtor_obj;
+                  Dafny.ISequence<RAST._IType> _1434___mcc_h1083 = _source43.dtor_typeParameters;
+                  Dafny.ISequence<RAST._IExpr> _1435___mcc_h1084 = _source43.dtor_arguments;
+                  return this;
+                } else if (_source43.is_Select) {
+                  RAST._IExpr _1436___mcc_h1088 = _source43.dtor_obj;
+                  Dafny.ISequence<Dafny.Rune> _1437___mcc_h1089 = _source43.dtor_name;
+                  return this;
+                } else {
+                  RAST._IExpr _1438___mcc_h1092 = _source43.dtor_obj;
+                  Dafny.ISequence<Dafny.Rune> _1439___mcc_h1093 = _source43.dtor_name;
+                  RAST._IExpr _source44 = _1438___mcc_h1092;
+                  if (_source44.is_RawExpr) {
+                    Dafny.ISequence<Dafny.Rune> _1440___mcc_h1096 = _source44.dtor_content;
+                    return this;
+                  } else if (_source44.is_Identifier) {
+                    Dafny.ISequence<Dafny.Rune> _1441___mcc_h1098 = _source44.dtor_name;
+                    if (object.Equals(_1441___mcc_h1098, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))) {
+                      if (object.Equals(_1439___mcc_h1093, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("dafny_runtime"))) {
+                        if (object.Equals(_1389___mcc_h993, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("DafnyInt"))) {
+                          if (object.Equals(_1339___mcc_h893, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("from"))) {
+                            Dafny.ISequence<RAST._IExpr> _1442_args = _1289___mcc_h792;
+                            Dafny.ISequence<RAST._IType> _1443_tpe = _1288___mcc_h791;
+                            if (((new BigInteger((_1443_tpe).Count)).Sign == 0) && ((new BigInteger((_1442_args).Count)) == (BigInteger.One))) {
+                              RAST._IExpr _source45 = (_1442_args).Select(BigInteger.Zero);
+                              if (_source45.is_RawExpr) {
+                                Dafny.ISequence<Dafny.Rune> _1444___mcc_h1204 = _source45.dtor_content;
+                                return this;
+                              } else if (_source45.is_Identifier) {
+                                Dafny.ISequence<Dafny.Rune> _1445___mcc_h1206 = _source45.dtor_name;
+                                return this;
+                              } else if (_source45.is_Match) {
+                                RAST._IExpr _1446___mcc_h1208 = _source45.dtor_matchee;
+                                Dafny.ISequence<RAST._IMatchCase> _1447___mcc_h1209 = _source45.dtor_cases;
+                                return this;
+                              } else if (_source45.is_StmtExpr) {
+                                RAST._IExpr _1448___mcc_h1212 = _source45.dtor_stmt;
+                                RAST._IExpr _1449___mcc_h1213 = _source45.dtor_rhs;
+                                return this;
+                              } else if (_source45.is_Block) {
+                                RAST._IExpr _1450___mcc_h1216 = _source45.dtor_underlying;
+                                return this;
+                              } else if (_source45.is_StructBuild) {
+                                Dafny.ISequence<Dafny.Rune> _1451___mcc_h1218 = _source45.dtor_name;
+                                Dafny.ISequence<RAST._IAssignIdentifier> _1452___mcc_h1219 = _source45.dtor_assignments;
+                                return this;
+                              } else if (_source45.is_Tuple) {
+                                Dafny.ISequence<RAST._IExpr> _1453___mcc_h1222 = _source45.dtor_arguments;
+                                return this;
+                              } else if (_source45.is_UnaryOp) {
+                                Dafny.ISequence<Dafny.Rune> _1454___mcc_h1224 = _source45.dtor_op1;
+                                RAST._IExpr _1455___mcc_h1225 = _source45.dtor_underlying;
+                                DAST.Format._IUnaryOpFormat _1456___mcc_h1226 = _source45.dtor_format;
+                                return this;
+                              } else if (_source45.is_BinaryOp) {
+                                Dafny.ISequence<Dafny.Rune> _1457___mcc_h1230 = _source45.dtor_op2;
+                                RAST._IExpr _1458___mcc_h1231 = _source45.dtor_left;
+                                RAST._IExpr _1459___mcc_h1232 = _source45.dtor_right;
+                                DAST.Format._IBinaryOpFormat _1460___mcc_h1233 = _source45.dtor_format2;
+                                return this;
+                              } else if (_source45.is_TypeAscription) {
+                                RAST._IExpr _1461___mcc_h1238 = _source45.dtor_left;
+                                RAST._IType _1462___mcc_h1239 = _source45.dtor_tpe;
+                                return this;
+                              } else if (_source45.is_LiteralInt) {
+                                Dafny.ISequence<Dafny.Rune> _1463___mcc_h1242 = _source45.dtor_value;
+                                Dafny.ISequence<Dafny.Rune> _1464_number = _1463___mcc_h1242;
+                                return RAST.Expr.create_LiteralInt(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/*optimized*/"), _1464_number));
+                              } else if (_source45.is_LiteralString) {
+                                Dafny.ISequence<Dafny.Rune> _1465___mcc_h1244 = _source45.dtor_value;
+                                bool _1466___mcc_h1245 = _source45.dtor_binary;
+                                Dafny.ISequence<Dafny.Rune> _1467_number = _1465___mcc_h1244;
+                                return RAST.Expr.create_LiteralInt(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/*optimized*/"), _1467_number));
+                              } else if (_source45.is_ConversionNum) {
+                                RAST._IType _1468___mcc_h1248 = _source45.dtor_tpe;
+                                RAST._IExpr _1469___mcc_h1249 = _source45.dtor_underlying;
+                                return this;
+                              } else if (_source45.is_DeclareVar) {
+                                RAST._IDeclareType _1470___mcc_h1252 = _source45.dtor_declareType;
+                                Dafny.ISequence<Dafny.Rune> _1471___mcc_h1253 = _source45.dtor_name;
+                                Std.Wrappers._IOption<RAST._IType> _1472___mcc_h1254 = _source45.dtor_optType;
+                                Std.Wrappers._IOption<RAST._IExpr> _1473___mcc_h1255 = _source45.dtor_optRhs;
+                                return this;
+                              } else if (_source45.is_AssignVar) {
+                                Dafny.ISequence<Dafny.Rune> _1474___mcc_h1260 = _source45.dtor_name;
+                                RAST._IExpr _1475___mcc_h1261 = _source45.dtor_rhs;
+                                return this;
+                              } else if (_source45.is_IfExpr) {
+                                RAST._IExpr _1476___mcc_h1264 = _source45.dtor_cond;
+                                RAST._IExpr _1477___mcc_h1265 = _source45.dtor_thn;
+                                RAST._IExpr _1478___mcc_h1266 = _source45.dtor_els;
+                                return this;
+                              } else if (_source45.is_Loop) {
+                                Std.Wrappers._IOption<RAST._IExpr> _1479___mcc_h1270 = _source45.dtor_optCond;
+                                RAST._IExpr _1480___mcc_h1271 = _source45.dtor_underlying;
+                                return this;
+                              } else if (_source45.is_For) {
+                                Dafny.ISequence<Dafny.Rune> _1481___mcc_h1274 = _source45.dtor_name;
+                                RAST._IExpr _1482___mcc_h1275 = _source45.dtor_range;
+                                RAST._IExpr _1483___mcc_h1276 = _source45.dtor_body;
+                                return this;
+                              } else if (_source45.is_Labelled) {
+                                Dafny.ISequence<Dafny.Rune> _1484___mcc_h1280 = _source45.dtor_lbl;
+                                RAST._IExpr _1485___mcc_h1281 = _source45.dtor_underlying;
+                                return this;
+                              } else if (_source45.is_Break) {
+                                Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1486___mcc_h1284 = _source45.dtor_optLbl;
+                                return this;
+                              } else if (_source45.is_Continue) {
+                                Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1487___mcc_h1286 = _source45.dtor_optLbl;
+                                return this;
+                              } else if (_source45.is_Return) {
+                                Std.Wrappers._IOption<RAST._IExpr> _1488___mcc_h1288 = _source45.dtor_optExpr;
+                                return this;
+                              } else if (_source45.is_Call) {
+                                RAST._IExpr _1489___mcc_h1290 = _source45.dtor_obj;
+                                Dafny.ISequence<RAST._IType> _1490___mcc_h1291 = _source45.dtor_typeParameters;
+                                Dafny.ISequence<RAST._IExpr> _1491___mcc_h1292 = _source45.dtor_arguments;
+                                return this;
+                              } else if (_source45.is_Select) {
+                                RAST._IExpr _1492___mcc_h1296 = _source45.dtor_obj;
+                                Dafny.ISequence<Dafny.Rune> _1493___mcc_h1297 = _source45.dtor_name;
+                                return this;
+                              } else {
+                                RAST._IExpr _1494___mcc_h1300 = _source45.dtor_obj;
+                                Dafny.ISequence<Dafny.Rune> _1495___mcc_h1301 = _source45.dtor_name;
+                                return this;
+                              }
+                            } else {
+                              return this;
+                            }
+                          } else {
+                            return this;
+                          }
+                        } else {
+                          return this;
+                        }
+                      } else {
+                        return this;
+                      }
+                    } else {
+                      return this;
+                    }
+                  } else if (_source44.is_Match) {
+                    RAST._IExpr _1496___mcc_h1100 = _source44.dtor_matchee;
+                    Dafny.ISequence<RAST._IMatchCase> _1497___mcc_h1101 = _source44.dtor_cases;
+                    return this;
+                  } else if (_source44.is_StmtExpr) {
+                    RAST._IExpr _1498___mcc_h1104 = _source44.dtor_stmt;
+                    RAST._IExpr _1499___mcc_h1105 = _source44.dtor_rhs;
+                    return this;
+                  } else if (_source44.is_Block) {
+                    RAST._IExpr _1500___mcc_h1108 = _source44.dtor_underlying;
+                    return this;
+                  } else if (_source44.is_StructBuild) {
+                    Dafny.ISequence<Dafny.Rune> _1501___mcc_h1110 = _source44.dtor_name;
+                    Dafny.ISequence<RAST._IAssignIdentifier> _1502___mcc_h1111 = _source44.dtor_assignments;
+                    return this;
+                  } else if (_source44.is_Tuple) {
+                    Dafny.ISequence<RAST._IExpr> _1503___mcc_h1114 = _source44.dtor_arguments;
+                    return this;
+                  } else if (_source44.is_UnaryOp) {
+                    Dafny.ISequence<Dafny.Rune> _1504___mcc_h1116 = _source44.dtor_op1;
+                    RAST._IExpr _1505___mcc_h1117 = _source44.dtor_underlying;
+                    DAST.Format._IUnaryOpFormat _1506___mcc_h1118 = _source44.dtor_format;
+                    return this;
+                  } else if (_source44.is_BinaryOp) {
+                    Dafny.ISequence<Dafny.Rune> _1507___mcc_h1122 = _source44.dtor_op2;
+                    RAST._IExpr _1508___mcc_h1123 = _source44.dtor_left;
+                    RAST._IExpr _1509___mcc_h1124 = _source44.dtor_right;
+                    DAST.Format._IBinaryOpFormat _1510___mcc_h1125 = _source44.dtor_format2;
+                    return this;
+                  } else if (_source44.is_TypeAscription) {
+                    RAST._IExpr _1511___mcc_h1130 = _source44.dtor_left;
+                    RAST._IType _1512___mcc_h1131 = _source44.dtor_tpe;
+                    return this;
+                  } else if (_source44.is_LiteralInt) {
+                    Dafny.ISequence<Dafny.Rune> _1513___mcc_h1134 = _source44.dtor_value;
+                    return this;
+                  } else if (_source44.is_LiteralString) {
+                    Dafny.ISequence<Dafny.Rune> _1514___mcc_h1136 = _source44.dtor_value;
+                    bool _1515___mcc_h1137 = _source44.dtor_binary;
+                    return this;
+                  } else if (_source44.is_ConversionNum) {
+                    RAST._IType _1516___mcc_h1140 = _source44.dtor_tpe;
+                    RAST._IExpr _1517___mcc_h1141 = _source44.dtor_underlying;
+                    return this;
+                  } else if (_source44.is_DeclareVar) {
+                    RAST._IDeclareType _1518___mcc_h1144 = _source44.dtor_declareType;
+                    Dafny.ISequence<Dafny.Rune> _1519___mcc_h1145 = _source44.dtor_name;
+                    Std.Wrappers._IOption<RAST._IType> _1520___mcc_h1146 = _source44.dtor_optType;
+                    Std.Wrappers._IOption<RAST._IExpr> _1521___mcc_h1147 = _source44.dtor_optRhs;
+                    return this;
+                  } else if (_source44.is_AssignVar) {
+                    Dafny.ISequence<Dafny.Rune> _1522___mcc_h1152 = _source44.dtor_name;
+                    RAST._IExpr _1523___mcc_h1153 = _source44.dtor_rhs;
+                    return this;
+                  } else if (_source44.is_IfExpr) {
+                    RAST._IExpr _1524___mcc_h1156 = _source44.dtor_cond;
+                    RAST._IExpr _1525___mcc_h1157 = _source44.dtor_thn;
+                    RAST._IExpr _1526___mcc_h1158 = _source44.dtor_els;
+                    return this;
+                  } else if (_source44.is_Loop) {
+                    Std.Wrappers._IOption<RAST._IExpr> _1527___mcc_h1162 = _source44.dtor_optCond;
+                    RAST._IExpr _1528___mcc_h1163 = _source44.dtor_underlying;
+                    return this;
+                  } else if (_source44.is_For) {
+                    Dafny.ISequence<Dafny.Rune> _1529___mcc_h1166 = _source44.dtor_name;
+                    RAST._IExpr _1530___mcc_h1167 = _source44.dtor_range;
+                    RAST._IExpr _1531___mcc_h1168 = _source44.dtor_body;
+                    return this;
+                  } else if (_source44.is_Labelled) {
+                    Dafny.ISequence<Dafny.Rune> _1532___mcc_h1172 = _source44.dtor_lbl;
+                    RAST._IExpr _1533___mcc_h1173 = _source44.dtor_underlying;
+                    return this;
+                  } else if (_source44.is_Break) {
+                    Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1534___mcc_h1176 = _source44.dtor_optLbl;
+                    return this;
+                  } else if (_source44.is_Continue) {
+                    Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1535___mcc_h1178 = _source44.dtor_optLbl;
+                    return this;
+                  } else if (_source44.is_Return) {
+                    Std.Wrappers._IOption<RAST._IExpr> _1536___mcc_h1180 = _source44.dtor_optExpr;
+                    return this;
+                  } else if (_source44.is_Call) {
+                    RAST._IExpr _1537___mcc_h1182 = _source44.dtor_obj;
+                    Dafny.ISequence<RAST._IType> _1538___mcc_h1183 = _source44.dtor_typeParameters;
+                    Dafny.ISequence<RAST._IExpr> _1539___mcc_h1184 = _source44.dtor_arguments;
+                    return this;
+                  } else if (_source44.is_Select) {
+                    RAST._IExpr _1540___mcc_h1188 = _source44.dtor_obj;
+                    Dafny.ISequence<Dafny.Rune> _1541___mcc_h1189 = _source44.dtor_name;
+                    return this;
+                  } else {
+                    RAST._IExpr _1542___mcc_h1192 = _source44.dtor_obj;
+                    Dafny.ISequence<Dafny.Rune> _1543___mcc_h1193 = _source44.dtor_name;
+                    return this;
+                  }
+                }
+              }
+            }
+          } else if (_source40.is_Select) {
+            RAST._IExpr _1544___mcc_h1196 = _source40.dtor_obj;
+            Dafny.ISequence<Dafny.Rune> _1545___mcc_h1197 = _source40.dtor_name;
+            return this;
+          } else {
+            RAST._IExpr _1546___mcc_h1200 = _source40.dtor_obj;
+            Dafny.ISequence<Dafny.Rune> _1547___mcc_h1201 = _source40.dtor_name;
+            return this;
+          }
+        } else {
+          return this;
+        }
+      } else if (_source27.is_DeclareVar) {
+        RAST._IDeclareType _1548___mcc_h652 = _source27.dtor_declareType;
+        Dafny.ISequence<Dafny.Rune> _1549___mcc_h653 = _source27.dtor_name;
+        Std.Wrappers._IOption<RAST._IType> _1550___mcc_h654 = _source27.dtor_optType;
+        Std.Wrappers._IOption<RAST._IExpr> _1551___mcc_h655 = _source27.dtor_optRhs;
+        return this;
+      } else if (_source27.is_AssignVar) {
+        Dafny.ISequence<Dafny.Rune> _1552___mcc_h660 = _source27.dtor_name;
+        RAST._IExpr _1553___mcc_h661 = _source27.dtor_rhs;
+        return this;
+      } else if (_source27.is_IfExpr) {
+        RAST._IExpr _1554___mcc_h664 = _source27.dtor_cond;
+        RAST._IExpr _1555___mcc_h665 = _source27.dtor_thn;
+        RAST._IExpr _1556___mcc_h666 = _source27.dtor_els;
+        return this;
+      } else if (_source27.is_Loop) {
+        Std.Wrappers._IOption<RAST._IExpr> _1557___mcc_h670 = _source27.dtor_optCond;
+        RAST._IExpr _1558___mcc_h671 = _source27.dtor_underlying;
+        return this;
+      } else if (_source27.is_For) {
+        Dafny.ISequence<Dafny.Rune> _1559___mcc_h674 = _source27.dtor_name;
+        RAST._IExpr _1560___mcc_h675 = _source27.dtor_range;
+        RAST._IExpr _1561___mcc_h676 = _source27.dtor_body;
+        return this;
+      } else if (_source27.is_Labelled) {
+        Dafny.ISequence<Dafny.Rune> _1562___mcc_h680 = _source27.dtor_lbl;
+        RAST._IExpr _1563___mcc_h681 = _source27.dtor_underlying;
+        return this;
+      } else if (_source27.is_Break) {
+        Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1564___mcc_h684 = _source27.dtor_optLbl;
+        return this;
+      } else if (_source27.is_Continue) {
+        Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1565___mcc_h686 = _source27.dtor_optLbl;
+        return this;
+      } else if (_source27.is_Return) {
+        Std.Wrappers._IOption<RAST._IExpr> _1566___mcc_h688 = _source27.dtor_optExpr;
+        return this;
+      } else if (_source27.is_Call) {
+        RAST._IExpr _1567___mcc_h690 = _source27.dtor_obj;
+        Dafny.ISequence<RAST._IType> _1568___mcc_h691 = _source27.dtor_typeParameters;
+        Dafny.ISequence<RAST._IExpr> _1569___mcc_h692 = _source27.dtor_arguments;
+        return this;
+      } else if (_source27.is_Select) {
+        RAST._IExpr _1570___mcc_h696 = _source27.dtor_obj;
+        Dafny.ISequence<Dafny.Rune> _1571___mcc_h697 = _source27.dtor_name;
+        return this;
+      } else {
+        RAST._IExpr _1572___mcc_h700 = _source27.dtor_obj;
+        Dafny.ISequence<Dafny.Rune> _1573___mcc_h701 = _source27.dtor_name;
+        return this;
+      }
+    }
+    public bool LeftRequiresParentheses(RAST._IExpr left) {
+      return ((this).printingInfo).NeedParenthesesForLeft((left).printingInfo);
+    }
+    public _System._ITuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>> LeftParentheses(RAST._IExpr left) {
+      if ((this).LeftRequiresParentheses(left)) {
+        return _System.Tuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
+      } else {
+        return _System.Tuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""));
+      }
+    }
+    public bool RightRequiresParentheses(RAST._IExpr right) {
+      return ((this).printingInfo).NeedParenthesesForRight((right).printingInfo);
+    }
+    public _System._ITuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>> RightParentheses(RAST._IExpr right) {
+      if ((this).RightRequiresParentheses(right)) {
+        return _System.Tuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
+      } else {
+        return _System.Tuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""));
+      }
+    }
+    public Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> RightMostIdentifier() {
+      RAST._IExpr _source46 = this;
+      if (_source46.is_RawExpr) {
+        Dafny.ISequence<Dafny.Rune> _1574___mcc_h0 = _source46.dtor_content;
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
+      } else if (_source46.is_Identifier) {
+        Dafny.ISequence<Dafny.Rune> _1575___mcc_h2 = _source46.dtor_name;
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
+      } else if (_source46.is_Match) {
+        RAST._IExpr _1576___mcc_h4 = _source46.dtor_matchee;
+        Dafny.ISequence<RAST._IMatchCase> _1577___mcc_h5 = _source46.dtor_cases;
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
+      } else if (_source46.is_StmtExpr) {
+        RAST._IExpr _1578___mcc_h8 = _source46.dtor_stmt;
+        RAST._IExpr _1579___mcc_h9 = _source46.dtor_rhs;
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
+      } else if (_source46.is_Block) {
+        RAST._IExpr _1580___mcc_h12 = _source46.dtor_underlying;
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
+      } else if (_source46.is_StructBuild) {
+        Dafny.ISequence<Dafny.Rune> _1581___mcc_h14 = _source46.dtor_name;
+        Dafny.ISequence<RAST._IAssignIdentifier> _1582___mcc_h15 = _source46.dtor_assignments;
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
+      } else if (_source46.is_Tuple) {
+        Dafny.ISequence<RAST._IExpr> _1583___mcc_h18 = _source46.dtor_arguments;
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
+      } else if (_source46.is_UnaryOp) {
+        Dafny.ISequence<Dafny.Rune> _1584___mcc_h20 = _source46.dtor_op1;
+        RAST._IExpr _1585___mcc_h21 = _source46.dtor_underlying;
+        DAST.Format._IUnaryOpFormat _1586___mcc_h22 = _source46.dtor_format;
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
+      } else if (_source46.is_BinaryOp) {
+        Dafny.ISequence<Dafny.Rune> _1587___mcc_h26 = _source46.dtor_op2;
+        RAST._IExpr _1588___mcc_h27 = _source46.dtor_left;
+        RAST._IExpr _1589___mcc_h28 = _source46.dtor_right;
+        DAST.Format._IBinaryOpFormat _1590___mcc_h29 = _source46.dtor_format2;
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
+      } else if (_source46.is_TypeAscription) {
+        RAST._IExpr _1591___mcc_h34 = _source46.dtor_left;
+        RAST._IType _1592___mcc_h35 = _source46.dtor_tpe;
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
+      } else if (_source46.is_LiteralInt) {
+        Dafny.ISequence<Dafny.Rune> _1593___mcc_h38 = _source46.dtor_value;
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
+      } else if (_source46.is_LiteralString) {
+        Dafny.ISequence<Dafny.Rune> _1594___mcc_h40 = _source46.dtor_value;
+        bool _1595___mcc_h41 = _source46.dtor_binary;
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
+      } else if (_source46.is_ConversionNum) {
+        RAST._IType _1596___mcc_h44 = _source46.dtor_tpe;
+        RAST._IExpr _1597___mcc_h45 = _source46.dtor_underlying;
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
+      } else if (_source46.is_DeclareVar) {
+        RAST._IDeclareType _1598___mcc_h48 = _source46.dtor_declareType;
+        Dafny.ISequence<Dafny.Rune> _1599___mcc_h49 = _source46.dtor_name;
+        Std.Wrappers._IOption<RAST._IType> _1600___mcc_h50 = _source46.dtor_optType;
+        Std.Wrappers._IOption<RAST._IExpr> _1601___mcc_h51 = _source46.dtor_optRhs;
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
+      } else if (_source46.is_AssignVar) {
+        Dafny.ISequence<Dafny.Rune> _1602___mcc_h56 = _source46.dtor_name;
+        RAST._IExpr _1603___mcc_h57 = _source46.dtor_rhs;
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
+      } else if (_source46.is_IfExpr) {
+        RAST._IExpr _1604___mcc_h60 = _source46.dtor_cond;
+        RAST._IExpr _1605___mcc_h61 = _source46.dtor_thn;
+        RAST._IExpr _1606___mcc_h62 = _source46.dtor_els;
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
+      } else if (_source46.is_Loop) {
+        Std.Wrappers._IOption<RAST._IExpr> _1607___mcc_h66 = _source46.dtor_optCond;
+        RAST._IExpr _1608___mcc_h67 = _source46.dtor_underlying;
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
+      } else if (_source46.is_For) {
+        Dafny.ISequence<Dafny.Rune> _1609___mcc_h70 = _source46.dtor_name;
+        RAST._IExpr _1610___mcc_h71 = _source46.dtor_range;
+        RAST._IExpr _1611___mcc_h72 = _source46.dtor_body;
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
+      } else if (_source46.is_Labelled) {
+        Dafny.ISequence<Dafny.Rune> _1612___mcc_h76 = _source46.dtor_lbl;
+        RAST._IExpr _1613___mcc_h77 = _source46.dtor_underlying;
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
+      } else if (_source46.is_Break) {
+        Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1614___mcc_h80 = _source46.dtor_optLbl;
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
+      } else if (_source46.is_Continue) {
+        Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1615___mcc_h82 = _source46.dtor_optLbl;
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
+      } else if (_source46.is_Return) {
+        Std.Wrappers._IOption<RAST._IExpr> _1616___mcc_h84 = _source46.dtor_optExpr;
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
+      } else if (_source46.is_Call) {
+        RAST._IExpr _1617___mcc_h86 = _source46.dtor_obj;
+        Dafny.ISequence<RAST._IType> _1618___mcc_h87 = _source46.dtor_typeParameters;
+        Dafny.ISequence<RAST._IExpr> _1619___mcc_h88 = _source46.dtor_arguments;
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
+      } else if (_source46.is_Select) {
+        RAST._IExpr _1620___mcc_h92 = _source46.dtor_obj;
+        Dafny.ISequence<Dafny.Rune> _1621___mcc_h93 = _source46.dtor_name;
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
+      } else {
+        RAST._IExpr _1622___mcc_h96 = _source46.dtor_obj;
+        Dafny.ISequence<Dafny.Rune> _1623___mcc_h97 = _source46.dtor_name;
+        Dafny.ISequence<Dafny.Rune> _1624_id = _1623___mcc_h97;
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_Some(_1624_id);
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
+      var _pat_let_tv4 = ind;
+      RAST._IExpr _source47 = (this).Optimize();
+      if (_source47.is_RawExpr) {
+        Dafny.ISequence<Dafny.Rune> _1625___mcc_h0 = _source47.dtor_content;
+        RAST._IExpr _1626_r = (this).Optimize();
+        return RAST.__default.AddIndent((_1626_r).dtor_content, ind);
+      } else if (_source47.is_Identifier) {
+        Dafny.ISequence<Dafny.Rune> _1627___mcc_h2 = _source47.dtor_name;
+        Dafny.ISequence<Dafny.Rune> _1628_name = _1627___mcc_h2;
+        return _1628_name;
+      } else if (_source47.is_Match) {
+        RAST._IExpr _1629___mcc_h4 = _source47.dtor_matchee;
+        Dafny.ISequence<RAST._IMatchCase> _1630___mcc_h5 = _source47.dtor_cases;
+        Dafny.ISequence<RAST._IMatchCase> _1631_cases = _1630___mcc_h5;
+        RAST._IExpr _1632_matchee = _1629___mcc_h4;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("match "), (_1632_matchee)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {")), RAST.__default.SeqToString<RAST._IMatchCase>(_1631_cases, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._IMatchCase, Dafny.ISequence<Dafny.Rune>>>>((_1633_ind) => ((System.Func<RAST._IMatchCase, Dafny.ISequence<Dafny.Rune>>)((_1634_c) => {
+          return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), _1633_ind), RAST.__default.IND), (_1634_c)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_1633_ind, RAST.__default.IND)));
+        })))(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(","))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n")), ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
+      } else if (_source47.is_StmtExpr) {
+        RAST._IExpr _1635___mcc_h8 = _source47.dtor_stmt;
+        RAST._IExpr _1636___mcc_h9 = _source47.dtor_rhs;
+        RAST._IExpr _1637_rhs = _1636___mcc_h9;
+        RAST._IExpr _1638_stmt = _1635___mcc_h8;
+        if (((_1638_stmt).is_RawExpr) && (((_1638_stmt).dtor_content).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")))) {
+          return (_1637_rhs)._ToString(ind);
+        } else {
+          return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat((_1638_stmt)._ToString(ind), (((_1638_stmt).NoExtraSemicolonAfter()) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";")))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n")), ind), (_1637_rhs)._ToString(ind));
+        }
+      } else if (_source47.is_Block) {
+        RAST._IExpr _1639___mcc_h12 = _source47.dtor_underlying;
+        RAST._IExpr _1640_underlying = _1639___mcc_h12;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("{\n"), ind), RAST.__default.IND), (_1640_underlying)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n")), ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
+      } else if (_source47.is_StructBuild) {
+        Dafny.ISequence<Dafny.Rune> _1641___mcc_h14 = _source47.dtor_name;
+        Dafny.ISequence<RAST._IAssignIdentifier> _1642___mcc_h15 = _source47.dtor_assignments;
+        Dafny.ISequence<RAST._IAssignIdentifier> _1643_assignments = _1642___mcc_h15;
+        Dafny.ISequence<Dafny.Rune> _1644_name = _1641___mcc_h14;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_1644_name, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {")), RAST.__default.SeqToString<RAST._IAssignIdentifier>(_1643_assignments, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._IAssignIdentifier, Dafny.ISequence<Dafny.Rune>>>>((_1645_ind) => ((System.Func<RAST._IAssignIdentifier, Dafny.ISequence<Dafny.Rune>>)((_1646_assignment) => {
+          return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), _1645_ind), RAST.__default.IND), (_1646_assignment)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_1645_ind, RAST.__default.IND)));
+        })))(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(","))), (((new BigInteger((_1643_assignments).Count)).Sign == 1) ? (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), ind)) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
+      } else if (_source47.is_Tuple) {
+        Dafny.ISequence<RAST._IExpr> _1647___mcc_h18 = _source47.dtor_arguments;
+        Dafny.ISequence<RAST._IExpr> _1648_arguments = _1647___mcc_h18;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), RAST.__default.SeqToString<RAST._IExpr>(_1648_arguments, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._IExpr, Dafny.ISequence<Dafny.Rune>>>>((_1649_ind) => ((System.Func<RAST._IExpr, Dafny.ISequence<Dafny.Rune>>)((_1650_arg) => {
+          return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), _1649_ind), RAST.__default.IND), (_1650_arg)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_1649_ind, RAST.__default.IND)));
+        })))(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(","))), (((new BigInteger((_1648_arguments).Count)).Sign == 1) ? (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), ind)) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
+      } else if (_source47.is_UnaryOp) {
+        Dafny.ISequence<Dafny.Rune> _1651___mcc_h20 = _source47.dtor_op1;
+        RAST._IExpr _1652___mcc_h21 = _source47.dtor_underlying;
+        DAST.Format._IUnaryOpFormat _1653___mcc_h22 = _source47.dtor_format;
+        DAST.Format._IUnaryOpFormat _1654_format = _1653___mcc_h22;
+        RAST._IExpr _1655_underlying = _1652___mcc_h21;
+        Dafny.ISequence<Dafny.Rune> _1656_op = _1651___mcc_h20;
+        _System._ITuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>> _let_tmp_rhs41 = ((((this).printingInfo).NeedParenthesesFor((_1655_underlying).printingInfo)) ? (_System.Tuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"))) : (_System.Tuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))));
+        Dafny.ISequence<Dafny.Rune> _1657_leftP = _let_tmp_rhs41.dtor__0;
+        Dafny.ISequence<Dafny.Rune> _1658_rightP = _let_tmp_rhs41.dtor__1;
+        Dafny.ISequence<Dafny.Rune> _1659_leftOp = ((((_1656_op).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&mut"))) && (!(_1657_leftP).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")))) ? (Dafny.Sequence<Dafny.Rune>.Concat(_1656_op, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" "))) : ((((_1656_op).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("?"))) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")) : (_1656_op))));
+        Dafny.ISequence<Dafny.Rune> _1660_rightOp = (((_1656_op).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("?"))) ? (_1656_op) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")));
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_1659_leftOp, _1657_leftP), (_1655_underlying)._ToString(ind)), _1658_rightP), _1660_rightOp);
+      } else if (_source47.is_BinaryOp) {
+        Dafny.ISequence<Dafny.Rune> _1661___mcc_h26 = _source47.dtor_op2;
+        RAST._IExpr _1662___mcc_h27 = _source47.dtor_left;
+        RAST._IExpr _1663___mcc_h28 = _source47.dtor_right;
+        DAST.Format._IBinaryOpFormat _1664___mcc_h29 = _source47.dtor_format2;
+        DAST.Format._IBinaryOpFormat _1665_format = _1664___mcc_h29;
+        RAST._IExpr _1666_right = _1663___mcc_h28;
+        RAST._IExpr _1667_left = _1662___mcc_h27;
+        Dafny.ISequence<Dafny.Rune> _1668_op2 = _1661___mcc_h26;
+        _System._ITuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>> _let_tmp_rhs42 = (this).LeftParentheses(_1667_left);
+        Dafny.ISequence<Dafny.Rune> _1669_leftLeftP = _let_tmp_rhs42.dtor__0;
+        Dafny.ISequence<Dafny.Rune> _1670_leftRighP = _let_tmp_rhs42.dtor__1;
+        _System._ITuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>> _let_tmp_rhs43 = (this).RightParentheses(_1666_right);
+        Dafny.ISequence<Dafny.Rune> _1671_rightLeftP = _let_tmp_rhs43.dtor__0;
+        Dafny.ISequence<Dafny.Rune> _1672_rightRightP = _let_tmp_rhs43.dtor__1;
+        Dafny.ISequence<Dafny.Rune> _1673_opRendered = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" "), _1668_op2), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" "));
+        Dafny.ISequence<Dafny.Rune> _1674_indLeft = (((_1669_leftLeftP).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("))) ? (Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND)) : (ind));
+        Dafny.ISequence<Dafny.Rune> _1675_indRight = (((_1671_rightLeftP).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("))) ? (Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND)) : (ind));
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_1669_leftLeftP, (_1667_left)._ToString(_1674_indLeft)), _1670_leftRighP), _1673_opRendered), _1671_rightLeftP), (_1666_right)._ToString(_1675_indRight)), _1672_rightRightP);
+      } else if (_source47.is_TypeAscription) {
+        RAST._IExpr _1676___mcc_h34 = _source47.dtor_left;
+        RAST._IType _1677___mcc_h35 = _source47.dtor_tpe;
+        RAST._IType _1678_tpe = _1677___mcc_h35;
+        RAST._IExpr _1679_left = _1676___mcc_h34;
+        _System._ITuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>> _let_tmp_rhs44 = (this).LeftParentheses(_1679_left);
+        Dafny.ISequence<Dafny.Rune> _1680_leftLeftP = _let_tmp_rhs44.dtor__0;
+        Dafny.ISequence<Dafny.Rune> _1681_leftRightP = _let_tmp_rhs44.dtor__1;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_1680_leftLeftP, (_1679_left)._ToString(RAST.__default.IND)), _1681_leftRightP), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" as ")), (_1678_tpe)._ToString(RAST.__default.IND));
+      } else if (_source47.is_LiteralInt) {
+        Dafny.ISequence<Dafny.Rune> _1682___mcc_h38 = _source47.dtor_value;
+        Dafny.ISequence<Dafny.Rune> _1683_number = _1682___mcc_h38;
+        return _1683_number;
+      } else if (_source47.is_LiteralString) {
+        Dafny.ISequence<Dafny.Rune> _1684___mcc_h40 = _source47.dtor_value;
+        bool _1685___mcc_h41 = _source47.dtor_binary;
+        bool _1686_binary = _1685___mcc_h41;
+        Dafny.ISequence<Dafny.Rune> _1687_characters = _1684___mcc_h40;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(((_1686_binary) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("b")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\"")), _1687_characters), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\""));
+      } else if (_source47.is_ConversionNum) {
+        RAST._IType _1688___mcc_h44 = _source47.dtor_tpe;
+        RAST._IExpr _1689___mcc_h45 = _source47.dtor_underlying;
+        RAST._IExpr _1690_expr = _1689___mcc_h45;
+        RAST._IType _1691_tpe = _1688___mcc_h44;
+        if (((((((((((_1691_tpe).is_U8) || ((_1691_tpe).is_U16)) || ((_1691_tpe).is_U32)) || ((_1691_tpe).is_U64)) || ((_1691_tpe).is_U128)) || ((_1691_tpe).is_I8)) || ((_1691_tpe).is_I16)) || ((_1691_tpe).is_I32)) || ((_1691_tpe).is_I64)) || ((_1691_tpe).is_I128)) {
+          return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("num::ToPrimitive::to_"), (_1691_tpe)._ToString(ind)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), (_1690_expr)._ToString(ind)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(").unwrap()"));
+        } else {
+          return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<b>Unsupported: Numeric conversion to "), (_1691_tpe)._ToString(ind)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("</b>"));
+        }
+      } else if (_source47.is_DeclareVar) {
+        RAST._IDeclareType _1692___mcc_h48 = _source47.dtor_declareType;
+        Dafny.ISequence<Dafny.Rune> _1693___mcc_h49 = _source47.dtor_name;
+        Std.Wrappers._IOption<RAST._IType> _1694___mcc_h50 = _source47.dtor_optType;
+        Std.Wrappers._IOption<RAST._IExpr> _1695___mcc_h51 = _source47.dtor_optRhs;
+        Std.Wrappers._IOption<RAST._IExpr> _1696_optExpr = _1695___mcc_h51;
+        Std.Wrappers._IOption<RAST._IType> _1697_optType = _1694___mcc_h50;
+        Dafny.ISequence<Dafny.Rune> _1698_name = _1693___mcc_h49;
+        RAST._IDeclareType _1699_declareType = _1692___mcc_h48;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("let "), ((object.Equals(_1699_declareType, RAST.DeclareType.create_MUT())) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("mut ")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")))), _1698_name), (((_1697_optType).is_Some) ? (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(": "), ((_1697_optType).dtor_value)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND)))) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")))), (((_1696_optExpr).is_Some) ? (Dafny.Helpers.Let<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>(((_1696_optExpr).dtor_value)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND)), _pat_let6_0 => Dafny.Helpers.Let<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>(_pat_let6_0, _1700_optExprString => (((_1700_optExprString).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))) ? (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("= /*issue with empty RHS*/"), ((((_1696_optExpr).dtor_value).is_RawExpr) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Empty Raw expr")) : (((((_1696_optExpr).dtor_value).is_LiteralString) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Empty string literal")) : (((((_1696_optExpr).dtor_value).is_LiteralInt) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Empty int literal")) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("Another case"))))))))) : (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" = "), _1700_optExprString)))))) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";"));
+      } else if (_source47.is_AssignVar) {
+        Dafny.ISequence<Dafny.Rune> _1701___mcc_h56 = _source47.dtor_name;
+        RAST._IExpr _1702___mcc_h57 = _source47.dtor_rhs;
+        RAST._IExpr _1703_expr = _1702___mcc_h57;
+        Dafny.ISequence<Dafny.Rune> _1704_name = _1701___mcc_h56;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_1704_name, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" = ")), (_1703_expr)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";"));
+      } else if (_source47.is_IfExpr) {
+        RAST._IExpr _1705___mcc_h60 = _source47.dtor_cond;
+        RAST._IExpr _1706___mcc_h61 = _source47.dtor_thn;
+        RAST._IExpr _1707___mcc_h62 = _source47.dtor_els;
+        RAST._IExpr _1708_els = _1707___mcc_h62;
+        RAST._IExpr _1709_thn = _1706___mcc_h61;
+        RAST._IExpr _1710_cond = _1705___mcc_h60;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("if "), (_1710_cond)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {\n")), ind), RAST.__default.IND), (_1709_thn)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n")), ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("} else {\n")), ind), RAST.__default.IND), (_1708_els)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n")), ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
+      } else if (_source47.is_Loop) {
+        Std.Wrappers._IOption<RAST._IExpr> _1711___mcc_h66 = _source47.dtor_optCond;
+        RAST._IExpr _1712___mcc_h67 = _source47.dtor_underlying;
+        RAST._IExpr _1713_underlying = _1712___mcc_h67;
+        Std.Wrappers._IOption<RAST._IExpr> _1714_optCond = _1711___mcc_h66;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(((System.Func<Std.Wrappers._IOption<RAST._IExpr>, Dafny.ISequence<Dafny.Rune>>)((_source48) => {
+          if (_source48.is_None) {
+            return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("loop");
+          } else {
+            RAST._IExpr _1715___mcc_h100 = _source48.dtor_value;
+            RAST._IExpr _1716_c = _1715___mcc_h100;
+            return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("while "), (_1716_c)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_pat_let_tv4, RAST.__default.IND)));
+          }
+        }))(_1714_optCond), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {\n")), ind), RAST.__default.IND), (_1713_underlying)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n")), ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
+      } else if (_source47.is_For) {
+        Dafny.ISequence<Dafny.Rune> _1717___mcc_h70 = _source47.dtor_name;
+        RAST._IExpr _1718___mcc_h71 = _source47.dtor_range;
+        RAST._IExpr _1719___mcc_h72 = _source47.dtor_body;
+        RAST._IExpr _1720_body = _1719___mcc_h72;
+        RAST._IExpr _1721_range = _1718___mcc_h71;
+        Dafny.ISequence<Dafny.Rune> _1722_name = _1717___mcc_h70;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("for "), _1722_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" in ")), (_1721_range)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {\n")), ind), RAST.__default.IND), (_1720_body)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n")), ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
+      } else if (_source47.is_Labelled) {
+        Dafny.ISequence<Dafny.Rune> _1723___mcc_h76 = _source47.dtor_lbl;
+        RAST._IExpr _1724___mcc_h77 = _source47.dtor_underlying;
+        RAST._IExpr _1725_underlying = _1724___mcc_h77;
+        Dafny.ISequence<Dafny.Rune> _1726_name = _1723___mcc_h76;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("'"), _1726_name), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(": ")), (_1725_underlying)._ToString(ind));
+      } else if (_source47.is_Break) {
+        Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1727___mcc_h80 = _source47.dtor_optLbl;
+        Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1728_optLbl = _1727___mcc_h80;
+        Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _source49 = _1728_optLbl;
+        if (_source49.is_None) {
+          return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("break;");
+        } else {
+          Dafny.ISequence<Dafny.Rune> _1729___mcc_h101 = _source49.dtor_value;
+          Dafny.ISequence<Dafny.Rune> _1730_lbl = _1729___mcc_h101;
+          return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("break '"), _1730_lbl), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";"));
+        }
+      } else if (_source47.is_Continue) {
+        Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1731___mcc_h82 = _source47.dtor_optLbl;
+        Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1732_optLbl = _1731___mcc_h82;
+        Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _source50 = _1732_optLbl;
+        if (_source50.is_None) {
+          return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("continue;");
+        } else {
+          Dafny.ISequence<Dafny.Rune> _1733___mcc_h102 = _source50.dtor_value;
+          Dafny.ISequence<Dafny.Rune> _1734_lbl = _1733___mcc_h102;
+          return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("continue '"), _1734_lbl), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";"));
+        }
+      } else if (_source47.is_Return) {
+        Std.Wrappers._IOption<RAST._IExpr> _1735___mcc_h84 = _source47.dtor_optExpr;
+        Std.Wrappers._IOption<RAST._IExpr> _1736_optExpr = _1735___mcc_h84;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("return"), (((_1736_optExpr).is_Some) ? (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" "), ((_1736_optExpr).dtor_value)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(ind, RAST.__default.IND)))) : (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";"));
+      } else if (_source47.is_Call) {
+        RAST._IExpr _1737___mcc_h86 = _source47.dtor_obj;
+        Dafny.ISequence<RAST._IType> _1738___mcc_h87 = _source47.dtor_typeParameters;
+        Dafny.ISequence<RAST._IExpr> _1739___mcc_h88 = _source47.dtor_arguments;
+        Dafny.ISequence<RAST._IExpr> _1740_args = _1739___mcc_h88;
+        Dafny.ISequence<RAST._IType> _1741_tpes = _1738___mcc_h87;
+        RAST._IExpr _1742_expr = _1737___mcc_h86;
+        _System._ITuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>> _let_tmp_rhs45 = (this).LeftParentheses(_1742_expr);
+        Dafny.ISequence<Dafny.Rune> _1743_leftP = _let_tmp_rhs45.dtor__0;
+        Dafny.ISequence<Dafny.Rune> _1744_rightP = _let_tmp_rhs45.dtor__1;
+        _System._ITuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>> _let_tmp_rhs46 = ((System.Func<Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>>, _System._ITuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>>)((_source51) => {
+          if (_source51.is_None) {
+            return _System.Tuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
+          } else {
+            Dafny.ISequence<Dafny.Rune> _1745___mcc_h103 = _source51.dtor_value;
+            if (object.Equals(_1745___mcc_h103, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("seq!"))) {
+              return _System.Tuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("["), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("]"));
+            } else if (object.Equals(_1745___mcc_h103, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("map!"))) {
+              return _System.Tuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("["), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("]"));
+            } else if (object.Equals(_1745___mcc_h103, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("set!"))) {
+              return _System.Tuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("{"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
+            } else if (object.Equals(_1745___mcc_h103, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("multiset!"))) {
+              return _System.Tuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("{"), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
+            } else {
+              return _System.Tuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>>.create(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("("), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")"));
+            }
+          }
+        }))((_1742_expr).RightMostIdentifier());
+        Dafny.ISequence<Dafny.Rune> _1746_leftCallP = _let_tmp_rhs46.dtor__0;
+        Dafny.ISequence<Dafny.Rune> _1747_rightCallP = _let_tmp_rhs46.dtor__1;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_1743_leftP, (_1742_expr)._ToString(ind)), _1744_rightP), (((new BigInteger((_1741_tpes).Count)).Sign == 0) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")) : (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::<"), RAST.__default.SeqToString<RAST._IType>(_1741_tpes, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._IType, Dafny.ISequence<Dafny.Rune>>>>((_1748_ind) => ((System.Func<RAST._IType, Dafny.ISequence<Dafny.Rune>>)((_1749_tpe) => {
+          return (_1749_tpe)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_1748_ind, RAST.__default.IND));
+        })))(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">"))))), _1746_leftCallP), RAST.__default.SeqToString<RAST._IExpr>(_1740_args, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._IExpr, Dafny.ISequence<Dafny.Rune>>>>((_1750_ind) => ((System.Func<RAST._IExpr, Dafny.ISequence<Dafny.Rune>>)((_1751_arg) => {
+          return (_1751_arg)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_1750_ind, RAST.__default.IND));
+        })))(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "))), _1747_rightCallP);
+      } else if (_source47.is_Select) {
+        RAST._IExpr _1752___mcc_h92 = _source47.dtor_obj;
+        Dafny.ISequence<Dafny.Rune> _1753___mcc_h93 = _source47.dtor_name;
+        Dafny.ISequence<Dafny.Rune> _1754_name = _1753___mcc_h93;
+        RAST._IExpr _1755_expression = _1752___mcc_h92;
+        _System._ITuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>> _let_tmp_rhs47 = (this).LeftParentheses(_1755_expression);
+        Dafny.ISequence<Dafny.Rune> _1756_leftP = _let_tmp_rhs47.dtor__0;
+        Dafny.ISequence<Dafny.Rune> _1757_rightP = _let_tmp_rhs47.dtor__1;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_1756_leftP, (_1755_expression)._ToString(ind)), _1757_rightP), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".")), _1754_name);
+      } else {
+        RAST._IExpr _1758___mcc_h96 = _source47.dtor_obj;
+        Dafny.ISequence<Dafny.Rune> _1759___mcc_h97 = _source47.dtor_name;
+        Dafny.ISequence<Dafny.Rune> _1760_name = _1759___mcc_h97;
+        RAST._IExpr _1761_expression = _1758___mcc_h96;
+        _System._ITuple2<Dafny.ISequence<Dafny.Rune>, Dafny.ISequence<Dafny.Rune>> _let_tmp_rhs48 = (this).LeftParentheses(_1761_expression);
+        Dafny.ISequence<Dafny.Rune> _1762_leftP = _let_tmp_rhs48.dtor__0;
+        Dafny.ISequence<Dafny.Rune> _1763_rightP = _let_tmp_rhs48.dtor__1;
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(_1762_leftP, (_1761_expression)._ToString(ind)), _1763_rightP), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("::")), _1760_name);
+      }
+    }
+    public RAST._IExpr Then(RAST._IExpr rhs2) {
+      if ((this).is_StmtExpr) {
+        return RAST.Expr.create_StmtExpr((this).dtor_stmt, ((this).dtor_rhs).Then(rhs2));
+      } else {
+        return RAST.Expr.create_StmtExpr(this, rhs2);
+      }
+    }
+    public RAST._IExpr Sel(Dafny.ISequence<Dafny.Rune> name) {
+      return RAST.Expr.create_Select(this, name);
+    }
+    public RAST._IExpr MSel(Dafny.ISequence<Dafny.Rune> name) {
+      return RAST.Expr.create_MemberSelect(this, name);
+    }
+    public RAST._IExpr Apply(Dafny.ISequence<RAST._IType> typeParameters, Dafny.ISequence<RAST._IExpr> arguments)
+    {
+      return RAST.Expr.create_Call(this, typeParameters, arguments);
+    }
+    public RAST._IExpr Apply1(RAST._IExpr argument) {
+      return RAST.Expr.create_Call(this, Dafny.Sequence<RAST._IType>.FromElements(), Dafny.Sequence<RAST._IExpr>.FromElements(argument));
+    }
+    public RAST._IPrintingInfo printingInfo { get {
+      RAST._IExpr _source52 = this;
+      if (_source52.is_RawExpr) {
+        Dafny.ISequence<Dafny.Rune> _1764___mcc_h0 = _source52.dtor_content;
+        return RAST.PrintingInfo.create_UnknownPrecedence();
+      } else if (_source52.is_Identifier) {
+        Dafny.ISequence<Dafny.Rune> _1765___mcc_h2 = _source52.dtor_name;
+        return RAST.PrintingInfo.create_Precedence(BigInteger.One);
+      } else if (_source52.is_Match) {
+        RAST._IExpr _1766___mcc_h4 = _source52.dtor_matchee;
+        Dafny.ISequence<RAST._IMatchCase> _1767___mcc_h5 = _source52.dtor_cases;
+        return RAST.PrintingInfo.create_UnknownPrecedence();
+      } else if (_source52.is_StmtExpr) {
+        RAST._IExpr _1768___mcc_h8 = _source52.dtor_stmt;
+        RAST._IExpr _1769___mcc_h9 = _source52.dtor_rhs;
+        return RAST.PrintingInfo.create_UnknownPrecedence();
+      } else if (_source52.is_Block) {
+        RAST._IExpr _1770___mcc_h12 = _source52.dtor_underlying;
+        return RAST.PrintingInfo.create_UnknownPrecedence();
+      } else if (_source52.is_StructBuild) {
+        Dafny.ISequence<Dafny.Rune> _1771___mcc_h14 = _source52.dtor_name;
+        Dafny.ISequence<RAST._IAssignIdentifier> _1772___mcc_h15 = _source52.dtor_assignments;
+        return RAST.PrintingInfo.create_UnknownPrecedence();
+      } else if (_source52.is_Tuple) {
+        Dafny.ISequence<RAST._IExpr> _1773___mcc_h18 = _source52.dtor_arguments;
+        return RAST.PrintingInfo.create_UnknownPrecedence();
+      } else if (_source52.is_UnaryOp) {
+        Dafny.ISequence<Dafny.Rune> _1774___mcc_h20 = _source52.dtor_op1;
+        RAST._IExpr _1775___mcc_h21 = _source52.dtor_underlying;
+        DAST.Format._IUnaryOpFormat _1776___mcc_h22 = _source52.dtor_format;
+        DAST.Format._IUnaryOpFormat _1777_format = _1776___mcc_h22;
+        RAST._IExpr _1778_underlying = _1775___mcc_h21;
+        Dafny.ISequence<Dafny.Rune> _1779_op = _1774___mcc_h20;
+        if (object.Equals(_1779_op, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("?"))) {
+          return RAST.PrintingInfo.create_SuffixPrecedence(new BigInteger(5));
+        } else if (object.Equals(_1779_op, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("-"))) {
+          return RAST.PrintingInfo.create_Precedence(new BigInteger(6));
+        } else if (object.Equals(_1779_op, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("*"))) {
+          return RAST.PrintingInfo.create_Precedence(new BigInteger(6));
+        } else if (object.Equals(_1779_op, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!"))) {
+          return RAST.PrintingInfo.create_Precedence(new BigInteger(6));
+        } else if (object.Equals(_1779_op, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"))) {
+          return RAST.PrintingInfo.create_Precedence(new BigInteger(6));
+        } else if (object.Equals(_1779_op, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&mut"))) {
+          return RAST.PrintingInfo.create_Precedence(new BigInteger(6));
+        } else {
+          return RAST.PrintingInfo.create_UnknownPrecedence();
+        }
+      } else if (_source52.is_BinaryOp) {
+        Dafny.ISequence<Dafny.Rune> _1780___mcc_h26 = _source52.dtor_op2;
+        RAST._IExpr _1781___mcc_h27 = _source52.dtor_left;
+        RAST._IExpr _1782___mcc_h28 = _source52.dtor_right;
+        DAST.Format._IBinaryOpFormat _1783___mcc_h29 = _source52.dtor_format2;
+        DAST.Format._IBinaryOpFormat _1784_format = _1783___mcc_h29;
+        RAST._IExpr _1785_right = _1782___mcc_h28;
+        RAST._IExpr _1786_left = _1781___mcc_h27;
+        Dafny.ISequence<Dafny.Rune> _1787_op2 = _1780___mcc_h26;
+        if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("*"))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(20), RAST.Associativity.create_LeftToRight());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/"))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(20), RAST.Associativity.create_LeftToRight());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("%"))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(20), RAST.Associativity.create_LeftToRight());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("+"))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(30), RAST.Associativity.create_LeftToRight());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("-"))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(30), RAST.Associativity.create_LeftToRight());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<<"))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(40), RAST.Associativity.create_LeftToRight());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">>"))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(40), RAST.Associativity.create_LeftToRight());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&"))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(50), RAST.Associativity.create_LeftToRight());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("^"))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(60), RAST.Associativity.create_LeftToRight());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("|"))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(70), RAST.Associativity.create_LeftToRight());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("=="))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(80), RAST.Associativity.create_RequiresParentheses());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("!="))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(80), RAST.Associativity.create_RequiresParentheses());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<"))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(80), RAST.Associativity.create_RequiresParentheses());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">"))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(80), RAST.Associativity.create_RequiresParentheses());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<="))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(80), RAST.Associativity.create_RequiresParentheses());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">="))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(80), RAST.Associativity.create_RequiresParentheses());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&&"))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(90), RAST.Associativity.create_LeftToRight());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("||"))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(100), RAST.Associativity.create_LeftToRight());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(".."))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RequiresParentheses());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("..="))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RequiresParentheses());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("="))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RightToLeft());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("+="))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RightToLeft());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("-="))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RightToLeft());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("*="))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RightToLeft());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("/="))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RightToLeft());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("%="))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RightToLeft());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("&="))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RightToLeft());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("|="))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RightToLeft());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("^="))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RightToLeft());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString("<<="))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RightToLeft());
+        } else if (object.Equals(_1787_op2, Dafny.Sequence<Dafny.Rune>.UnicodeFromString(">>="))) {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(110), RAST.Associativity.create_RightToLeft());
+        } else {
+          return RAST.PrintingInfo.create_PrecedenceAssociativity(BigInteger.Zero, RAST.Associativity.create_RequiresParentheses());
+        }
+      } else if (_source52.is_TypeAscription) {
+        RAST._IExpr _1788___mcc_h34 = _source52.dtor_left;
+        RAST._IType _1789___mcc_h35 = _source52.dtor_tpe;
+        RAST._IType _1790_tpe = _1789___mcc_h35;
+        RAST._IExpr _1791_left = _1788___mcc_h34;
+        return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(10), RAST.Associativity.create_LeftToRight());
+      } else if (_source52.is_LiteralInt) {
+        Dafny.ISequence<Dafny.Rune> _1792___mcc_h38 = _source52.dtor_value;
+        return RAST.PrintingInfo.create_Precedence(BigInteger.One);
+      } else if (_source52.is_LiteralString) {
+        Dafny.ISequence<Dafny.Rune> _1793___mcc_h40 = _source52.dtor_value;
+        bool _1794___mcc_h41 = _source52.dtor_binary;
+        return RAST.PrintingInfo.create_Precedence(BigInteger.One);
+      } else if (_source52.is_ConversionNum) {
+        RAST._IType _1795___mcc_h44 = _source52.dtor_tpe;
+        RAST._IExpr _1796___mcc_h45 = _source52.dtor_underlying;
+        return RAST.PrintingInfo.create_UnknownPrecedence();
+      } else if (_source52.is_DeclareVar) {
+        RAST._IDeclareType _1797___mcc_h48 = _source52.dtor_declareType;
+        Dafny.ISequence<Dafny.Rune> _1798___mcc_h49 = _source52.dtor_name;
+        Std.Wrappers._IOption<RAST._IType> _1799___mcc_h50 = _source52.dtor_optType;
+        Std.Wrappers._IOption<RAST._IExpr> _1800___mcc_h51 = _source52.dtor_optRhs;
+        return RAST.PrintingInfo.create_UnknownPrecedence();
+      } else if (_source52.is_AssignVar) {
+        Dafny.ISequence<Dafny.Rune> _1801___mcc_h56 = _source52.dtor_name;
+        RAST._IExpr _1802___mcc_h57 = _source52.dtor_rhs;
+        return RAST.PrintingInfo.create_UnknownPrecedence();
+      } else if (_source52.is_IfExpr) {
+        RAST._IExpr _1803___mcc_h60 = _source52.dtor_cond;
+        RAST._IExpr _1804___mcc_h61 = _source52.dtor_thn;
+        RAST._IExpr _1805___mcc_h62 = _source52.dtor_els;
+        return RAST.PrintingInfo.create_UnknownPrecedence();
+      } else if (_source52.is_Loop) {
+        Std.Wrappers._IOption<RAST._IExpr> _1806___mcc_h66 = _source52.dtor_optCond;
+        RAST._IExpr _1807___mcc_h67 = _source52.dtor_underlying;
+        return RAST.PrintingInfo.create_UnknownPrecedence();
+      } else if (_source52.is_For) {
+        Dafny.ISequence<Dafny.Rune> _1808___mcc_h70 = _source52.dtor_name;
+        RAST._IExpr _1809___mcc_h71 = _source52.dtor_range;
+        RAST._IExpr _1810___mcc_h72 = _source52.dtor_body;
+        return RAST.PrintingInfo.create_UnknownPrecedence();
+      } else if (_source52.is_Labelled) {
+        Dafny.ISequence<Dafny.Rune> _1811___mcc_h76 = _source52.dtor_lbl;
+        RAST._IExpr _1812___mcc_h77 = _source52.dtor_underlying;
+        return RAST.PrintingInfo.create_UnknownPrecedence();
+      } else if (_source52.is_Break) {
+        Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1813___mcc_h80 = _source52.dtor_optLbl;
+        return RAST.PrintingInfo.create_UnknownPrecedence();
+      } else if (_source52.is_Continue) {
+        Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _1814___mcc_h82 = _source52.dtor_optLbl;
+        return RAST.PrintingInfo.create_UnknownPrecedence();
+      } else if (_source52.is_Return) {
+        Std.Wrappers._IOption<RAST._IExpr> _1815___mcc_h84 = _source52.dtor_optExpr;
+        return RAST.PrintingInfo.create_UnknownPrecedence();
+      } else if (_source52.is_Call) {
+        RAST._IExpr _1816___mcc_h86 = _source52.dtor_obj;
+        Dafny.ISequence<RAST._IType> _1817___mcc_h87 = _source52.dtor_typeParameters;
+        Dafny.ISequence<RAST._IExpr> _1818___mcc_h88 = _source52.dtor_arguments;
+        return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(2), RAST.Associativity.create_LeftToRight());
+      } else if (_source52.is_Select) {
+        RAST._IExpr _1819___mcc_h92 = _source52.dtor_obj;
+        Dafny.ISequence<Dafny.Rune> _1820___mcc_h93 = _source52.dtor_name;
+        Dafny.ISequence<Dafny.Rune> _1821_name = _1820___mcc_h93;
+        RAST._IExpr _1822_underlying = _1819___mcc_h92;
+        return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(2), RAST.Associativity.create_LeftToRight());
+      } else {
+        RAST._IExpr _1823___mcc_h96 = _source52.dtor_obj;
+        Dafny.ISequence<Dafny.Rune> _1824___mcc_h97 = _source52.dtor_name;
+        Dafny.ISequence<Dafny.Rune> _1825_name = _1824___mcc_h97;
+        RAST._IExpr _1826_underlying = _1823___mcc_h96;
+        return RAST.PrintingInfo.create_PrecedenceAssociativity(new BigInteger(2), RAST.Associativity.create_LeftToRight());
+      }
+    } }
+  }
+  public class Expr_RawExpr : Expr {
+    public readonly Dafny.ISequence<Dafny.Rune> _content;
+    public Expr_RawExpr(Dafny.ISequence<Dafny.Rune> content) : base() {
+      this._content = content;
+    }
+    public override _IExpr DowncastClone() {
+      if (this is _IExpr dt) { return dt; }
+      return new Expr_RawExpr(_content);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Expr_RawExpr;
+      return oth != null && object.Equals(this._content, oth._content);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._content));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Expr.RawExpr";
+      s += "(";
+      s += this._content.ToVerbatimString(true);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expr_Identifier : Expr {
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public Expr_Identifier(Dafny.ISequence<Dafny.Rune> name) : base() {
+      this._name = name;
+    }
+    public override _IExpr DowncastClone() {
+      if (this is _IExpr dt) { return dt; }
+      return new Expr_Identifier(_name);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Expr_Identifier;
+      return oth != null && object.Equals(this._name, oth._name);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Expr.Identifier";
+      s += "(";
+      s += this._name.ToVerbatimString(true);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expr_Match : Expr {
+    public readonly RAST._IExpr _matchee;
+    public readonly Dafny.ISequence<RAST._IMatchCase> _cases;
+    public Expr_Match(RAST._IExpr matchee, Dafny.ISequence<RAST._IMatchCase> cases) : base() {
+      this._matchee = matchee;
+      this._cases = cases;
+    }
+    public override _IExpr DowncastClone() {
+      if (this is _IExpr dt) { return dt; }
+      return new Expr_Match(_matchee, _cases);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Expr_Match;
+      return oth != null && object.Equals(this._matchee, oth._matchee) && object.Equals(this._cases, oth._cases);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 2;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._matchee));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._cases));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Expr.Match";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._matchee);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._cases);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expr_StmtExpr : Expr {
+    public readonly RAST._IExpr _stmt;
+    public readonly RAST._IExpr _rhs;
+    public Expr_StmtExpr(RAST._IExpr stmt, RAST._IExpr rhs) : base() {
+      this._stmt = stmt;
+      this._rhs = rhs;
+    }
+    public override _IExpr DowncastClone() {
+      if (this is _IExpr dt) { return dt; }
+      return new Expr_StmtExpr(_stmt, _rhs);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Expr_StmtExpr;
+      return oth != null && object.Equals(this._stmt, oth._stmt) && object.Equals(this._rhs, oth._rhs);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 3;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._stmt));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._rhs));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Expr.StmtExpr";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._stmt);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._rhs);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expr_Block : Expr {
+    public readonly RAST._IExpr _underlying;
+    public Expr_Block(RAST._IExpr underlying) : base() {
+      this._underlying = underlying;
+    }
+    public override _IExpr DowncastClone() {
+      if (this is _IExpr dt) { return dt; }
+      return new Expr_Block(_underlying);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Expr_Block;
+      return oth != null && object.Equals(this._underlying, oth._underlying);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 4;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._underlying));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Expr.Block";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._underlying);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expr_StructBuild : Expr {
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public readonly Dafny.ISequence<RAST._IAssignIdentifier> _assignments;
+    public Expr_StructBuild(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<RAST._IAssignIdentifier> assignments) : base() {
+      this._name = name;
+      this._assignments = assignments;
+    }
+    public override _IExpr DowncastClone() {
+      if (this is _IExpr dt) { return dt; }
+      return new Expr_StructBuild(_name, _assignments);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Expr_StructBuild;
+      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._assignments, oth._assignments);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 5;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._assignments));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Expr.StructBuild";
+      s += "(";
+      s += this._name.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._assignments);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expr_Tuple : Expr {
+    public readonly Dafny.ISequence<RAST._IExpr> _arguments;
+    public Expr_Tuple(Dafny.ISequence<RAST._IExpr> arguments) : base() {
+      this._arguments = arguments;
+    }
+    public override _IExpr DowncastClone() {
+      if (this is _IExpr dt) { return dt; }
+      return new Expr_Tuple(_arguments);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Expr_Tuple;
+      return oth != null && object.Equals(this._arguments, oth._arguments);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 6;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._arguments));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Expr.Tuple";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._arguments);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expr_UnaryOp : Expr {
+    public readonly Dafny.ISequence<Dafny.Rune> _op1;
+    public readonly RAST._IExpr _underlying;
+    public readonly DAST.Format._IUnaryOpFormat _format;
+    public Expr_UnaryOp(Dafny.ISequence<Dafny.Rune> op1, RAST._IExpr underlying, DAST.Format._IUnaryOpFormat format) : base() {
+      this._op1 = op1;
+      this._underlying = underlying;
+      this._format = format;
+    }
+    public override _IExpr DowncastClone() {
+      if (this is _IExpr dt) { return dt; }
+      return new Expr_UnaryOp(_op1, _underlying, _format);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Expr_UnaryOp;
+      return oth != null && object.Equals(this._op1, oth._op1) && object.Equals(this._underlying, oth._underlying) && object.Equals(this._format, oth._format);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 7;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._op1));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._underlying));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._format));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Expr.UnaryOp";
+      s += "(";
+      s += this._op1.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._underlying);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._format);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expr_BinaryOp : Expr {
+    public readonly Dafny.ISequence<Dafny.Rune> _op2;
+    public readonly RAST._IExpr _left;
+    public readonly RAST._IExpr _right;
+    public readonly DAST.Format._IBinaryOpFormat _format2;
+    public Expr_BinaryOp(Dafny.ISequence<Dafny.Rune> op2, RAST._IExpr left, RAST._IExpr right, DAST.Format._IBinaryOpFormat format2) : base() {
+      this._op2 = op2;
+      this._left = left;
+      this._right = right;
+      this._format2 = format2;
+    }
+    public override _IExpr DowncastClone() {
+      if (this is _IExpr dt) { return dt; }
+      return new Expr_BinaryOp(_op2, _left, _right, _format2);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Expr_BinaryOp;
+      return oth != null && object.Equals(this._op2, oth._op2) && object.Equals(this._left, oth._left) && object.Equals(this._right, oth._right) && object.Equals(this._format2, oth._format2);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 8;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._op2));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._left));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._right));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._format2));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Expr.BinaryOp";
+      s += "(";
+      s += this._op2.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._left);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._right);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._format2);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expr_TypeAscription : Expr {
+    public readonly RAST._IExpr _left;
+    public readonly RAST._IType _tpe;
+    public Expr_TypeAscription(RAST._IExpr left, RAST._IType tpe) : base() {
+      this._left = left;
+      this._tpe = tpe;
+    }
+    public override _IExpr DowncastClone() {
+      if (this is _IExpr dt) { return dt; }
+      return new Expr_TypeAscription(_left, _tpe);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Expr_TypeAscription;
+      return oth != null && object.Equals(this._left, oth._left) && object.Equals(this._tpe, oth._tpe);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 9;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._left));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._tpe));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Expr.TypeAscription";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._left);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._tpe);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expr_LiteralInt : Expr {
+    public readonly Dafny.ISequence<Dafny.Rune> _value;
+    public Expr_LiteralInt(Dafny.ISequence<Dafny.Rune> @value) : base() {
+      this._value = @value;
+    }
+    public override _IExpr DowncastClone() {
+      if (this is _IExpr dt) { return dt; }
+      return new Expr_LiteralInt(_value);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Expr_LiteralInt;
+      return oth != null && object.Equals(this._value, oth._value);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 10;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._value));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Expr.LiteralInt";
+      s += "(";
+      s += this._value.ToVerbatimString(true);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expr_LiteralString : Expr {
+    public readonly Dafny.ISequence<Dafny.Rune> _value;
+    public readonly bool _binary;
+    public Expr_LiteralString(Dafny.ISequence<Dafny.Rune> @value, bool binary) : base() {
+      this._value = @value;
+      this._binary = binary;
+    }
+    public override _IExpr DowncastClone() {
+      if (this is _IExpr dt) { return dt; }
+      return new Expr_LiteralString(_value, _binary);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Expr_LiteralString;
+      return oth != null && object.Equals(this._value, oth._value) && this._binary == oth._binary;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 11;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._value));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._binary));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Expr.LiteralString";
+      s += "(";
+      s += this._value.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._binary);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expr_ConversionNum : Expr {
+    public readonly RAST._IType _tpe;
+    public readonly RAST._IExpr _underlying;
+    public Expr_ConversionNum(RAST._IType tpe, RAST._IExpr underlying) : base() {
+      this._tpe = tpe;
+      this._underlying = underlying;
+    }
+    public override _IExpr DowncastClone() {
+      if (this is _IExpr dt) { return dt; }
+      return new Expr_ConversionNum(_tpe, _underlying);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Expr_ConversionNum;
+      return oth != null && object.Equals(this._tpe, oth._tpe) && object.Equals(this._underlying, oth._underlying);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 12;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._tpe));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._underlying));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Expr.ConversionNum";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._tpe);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._underlying);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expr_DeclareVar : Expr {
+    public readonly RAST._IDeclareType _declareType;
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public readonly Std.Wrappers._IOption<RAST._IType> _optType;
+    public readonly Std.Wrappers._IOption<RAST._IExpr> _optRhs;
+    public Expr_DeclareVar(RAST._IDeclareType declareType, Dafny.ISequence<Dafny.Rune> name, Std.Wrappers._IOption<RAST._IType> optType, Std.Wrappers._IOption<RAST._IExpr> optRhs) : base() {
+      this._declareType = declareType;
+      this._name = name;
+      this._optType = optType;
+      this._optRhs = optRhs;
+    }
+    public override _IExpr DowncastClone() {
+      if (this is _IExpr dt) { return dt; }
+      return new Expr_DeclareVar(_declareType, _name, _optType, _optRhs);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Expr_DeclareVar;
+      return oth != null && object.Equals(this._declareType, oth._declareType) && object.Equals(this._name, oth._name) && object.Equals(this._optType, oth._optType) && object.Equals(this._optRhs, oth._optRhs);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 13;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._declareType));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._optType));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._optRhs));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Expr.DeclareVar";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._declareType);
+      s += ", ";
+      s += this._name.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._optType);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._optRhs);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expr_AssignVar : Expr {
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public readonly RAST._IExpr _rhs;
+    public Expr_AssignVar(Dafny.ISequence<Dafny.Rune> name, RAST._IExpr rhs) : base() {
+      this._name = name;
+      this._rhs = rhs;
+    }
+    public override _IExpr DowncastClone() {
+      if (this is _IExpr dt) { return dt; }
+      return new Expr_AssignVar(_name, _rhs);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Expr_AssignVar;
+      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._rhs, oth._rhs);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 14;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._rhs));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Expr.AssignVar";
+      s += "(";
+      s += this._name.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._rhs);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expr_IfExpr : Expr {
+    public readonly RAST._IExpr _cond;
+    public readonly RAST._IExpr _thn;
+    public readonly RAST._IExpr _els;
+    public Expr_IfExpr(RAST._IExpr cond, RAST._IExpr thn, RAST._IExpr els) : base() {
+      this._cond = cond;
+      this._thn = thn;
+      this._els = els;
+    }
+    public override _IExpr DowncastClone() {
+      if (this is _IExpr dt) { return dt; }
+      return new Expr_IfExpr(_cond, _thn, _els);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Expr_IfExpr;
+      return oth != null && object.Equals(this._cond, oth._cond) && object.Equals(this._thn, oth._thn) && object.Equals(this._els, oth._els);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 15;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._cond));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._thn));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._els));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Expr.IfExpr";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._cond);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._thn);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._els);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expr_Loop : Expr {
+    public readonly Std.Wrappers._IOption<RAST._IExpr> _optCond;
+    public readonly RAST._IExpr _underlying;
+    public Expr_Loop(Std.Wrappers._IOption<RAST._IExpr> optCond, RAST._IExpr underlying) : base() {
+      this._optCond = optCond;
+      this._underlying = underlying;
+    }
+    public override _IExpr DowncastClone() {
+      if (this is _IExpr dt) { return dt; }
+      return new Expr_Loop(_optCond, _underlying);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Expr_Loop;
+      return oth != null && object.Equals(this._optCond, oth._optCond) && object.Equals(this._underlying, oth._underlying);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 16;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._optCond));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._underlying));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Expr.Loop";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._optCond);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._underlying);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expr_For : Expr {
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public readonly RAST._IExpr _range;
+    public readonly RAST._IExpr _body;
+    public Expr_For(Dafny.ISequence<Dafny.Rune> name, RAST._IExpr range, RAST._IExpr body) : base() {
+      this._name = name;
+      this._range = range;
+      this._body = body;
+    }
+    public override _IExpr DowncastClone() {
+      if (this is _IExpr dt) { return dt; }
+      return new Expr_For(_name, _range, _body);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Expr_For;
+      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._range, oth._range) && object.Equals(this._body, oth._body);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 17;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._range));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Expr.For";
+      s += "(";
+      s += this._name.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._range);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._body);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expr_Labelled : Expr {
+    public readonly Dafny.ISequence<Dafny.Rune> _lbl;
+    public readonly RAST._IExpr _underlying;
+    public Expr_Labelled(Dafny.ISequence<Dafny.Rune> lbl, RAST._IExpr underlying) : base() {
+      this._lbl = lbl;
+      this._underlying = underlying;
+    }
+    public override _IExpr DowncastClone() {
+      if (this is _IExpr dt) { return dt; }
+      return new Expr_Labelled(_lbl, _underlying);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Expr_Labelled;
+      return oth != null && object.Equals(this._lbl, oth._lbl) && object.Equals(this._underlying, oth._underlying);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 18;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._lbl));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._underlying));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Expr.Labelled";
+      s += "(";
+      s += this._lbl.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._underlying);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expr_Break : Expr {
+    public readonly Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _optLbl;
+    public Expr_Break(Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> optLbl) : base() {
+      this._optLbl = optLbl;
+    }
+    public override _IExpr DowncastClone() {
+      if (this is _IExpr dt) { return dt; }
+      return new Expr_Break(_optLbl);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Expr_Break;
+      return oth != null && object.Equals(this._optLbl, oth._optLbl);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 19;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._optLbl));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Expr.Break";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._optLbl);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expr_Continue : Expr {
+    public readonly Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _optLbl;
+    public Expr_Continue(Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> optLbl) : base() {
+      this._optLbl = optLbl;
+    }
+    public override _IExpr DowncastClone() {
+      if (this is _IExpr dt) { return dt; }
+      return new Expr_Continue(_optLbl);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Expr_Continue;
+      return oth != null && object.Equals(this._optLbl, oth._optLbl);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 20;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._optLbl));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Expr.Continue";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._optLbl);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expr_Return : Expr {
+    public readonly Std.Wrappers._IOption<RAST._IExpr> _optExpr;
+    public Expr_Return(Std.Wrappers._IOption<RAST._IExpr> optExpr) : base() {
+      this._optExpr = optExpr;
+    }
+    public override _IExpr DowncastClone() {
+      if (this is _IExpr dt) { return dt; }
+      return new Expr_Return(_optExpr);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Expr_Return;
+      return oth != null && object.Equals(this._optExpr, oth._optExpr);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 21;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._optExpr));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Expr.Return";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._optExpr);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expr_Call : Expr {
+    public readonly RAST._IExpr _obj;
+    public readonly Dafny.ISequence<RAST._IType> _typeParameters;
+    public readonly Dafny.ISequence<RAST._IExpr> _arguments;
+    public Expr_Call(RAST._IExpr obj, Dafny.ISequence<RAST._IType> typeParameters, Dafny.ISequence<RAST._IExpr> arguments) : base() {
+      this._obj = obj;
+      this._typeParameters = typeParameters;
+      this._arguments = arguments;
+    }
+    public override _IExpr DowncastClone() {
+      if (this is _IExpr dt) { return dt; }
+      return new Expr_Call(_obj, _typeParameters, _arguments);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Expr_Call;
+      return oth != null && object.Equals(this._obj, oth._obj) && object.Equals(this._typeParameters, oth._typeParameters) && object.Equals(this._arguments, oth._arguments);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 22;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._obj));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeParameters));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._arguments));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Expr.Call";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._obj);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._typeParameters);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._arguments);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expr_Select : Expr {
+    public readonly RAST._IExpr _obj;
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public Expr_Select(RAST._IExpr obj, Dafny.ISequence<Dafny.Rune> name) : base() {
+      this._obj = obj;
+      this._name = name;
+    }
+    public override _IExpr DowncastClone() {
+      if (this is _IExpr dt) { return dt; }
+      return new Expr_Select(_obj, _name);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Expr_Select;
+      return oth != null && object.Equals(this._obj, oth._obj) && object.Equals(this._name, oth._name);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 23;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._obj));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Expr.Select";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._obj);
+      s += ", ";
+      s += this._name.ToVerbatimString(true);
+      s += ")";
+      return s;
+    }
+  }
+  public class Expr_MemberSelect : Expr {
+    public readonly RAST._IExpr _obj;
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public Expr_MemberSelect(RAST._IExpr obj, Dafny.ISequence<Dafny.Rune> name) : base() {
+      this._obj = obj;
+      this._name = name;
+    }
+    public override _IExpr DowncastClone() {
+      if (this is _IExpr dt) { return dt; }
+      return new Expr_MemberSelect(_obj, _name);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Expr_MemberSelect;
+      return oth != null && object.Equals(this._obj, oth._obj) && object.Equals(this._name, oth._name);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 24;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._obj));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Expr.MemberSelect";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._obj);
+      s += ", ";
+      s += this._name.ToVerbatimString(true);
+      s += ")";
+      return s;
+    }
+  }
+
+  public interface _IFn {
+    bool is_Fn { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_name { get; }
+    Dafny.ISequence<RAST._ITypeParam> dtor_typeParams { get; }
+    Dafny.ISequence<RAST._IFormal> dtor_formals { get; }
+    Std.Wrappers._IOption<RAST._IType> dtor_returnType { get; }
+    Dafny.ISequence<Dafny.Rune> dtor_where { get; }
+    Std.Wrappers._IOption<RAST._IExpr> dtor_body { get; }
+    _IFn DowncastClone();
+    Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind);
+  }
+  public class Fn : _IFn {
+    public readonly Dafny.ISequence<Dafny.Rune> _name;
+    public readonly Dafny.ISequence<RAST._ITypeParam> _typeParams;
+    public readonly Dafny.ISequence<RAST._IFormal> _formals;
+    public readonly Std.Wrappers._IOption<RAST._IType> _returnType;
+    public readonly Dafny.ISequence<Dafny.Rune> _where;
+    public readonly Std.Wrappers._IOption<RAST._IExpr> _body;
+    public Fn(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<RAST._ITypeParam> typeParams, Dafny.ISequence<RAST._IFormal> formals, Std.Wrappers._IOption<RAST._IType> returnType, Dafny.ISequence<Dafny.Rune> @where, Std.Wrappers._IOption<RAST._IExpr> body) {
+      this._name = name;
+      this._typeParams = typeParams;
+      this._formals = formals;
+      this._returnType = returnType;
+      this._where = @where;
+      this._body = body;
+    }
+    public _IFn DowncastClone() {
+      if (this is _IFn dt) { return dt; }
+      return new Fn(_name, _typeParams, _formals, _returnType, _where, _body);
+    }
+    public override bool Equals(object other) {
+      var oth = other as RAST.Fn;
+      return oth != null && object.Equals(this._name, oth._name) && object.Equals(this._typeParams, oth._typeParams) && object.Equals(this._formals, oth._formals) && object.Equals(this._returnType, oth._returnType) && object.Equals(this._where, oth._where) && object.Equals(this._body, oth._body);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._name));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._typeParams));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._formals));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._returnType));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._where));
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._body));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "RAST.Fn.Fn";
+      s += "(";
+      s += this._name.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._typeParams);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._formals);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._returnType);
+      s += ", ";
+      s += this._where.ToVerbatimString(true);
+      s += ", ";
+      s += Dafny.Helpers.ToString(this._body);
+      s += ")";
+      return s;
+    }
+    private static readonly RAST._IFn theDefault = create(Dafny.Sequence<Dafny.Rune>.Empty, Dafny.Sequence<RAST._ITypeParam>.Empty, Dafny.Sequence<RAST._IFormal>.Empty, Std.Wrappers.Option<RAST._IType>.Default(), Dafny.Sequence<Dafny.Rune>.Empty, Std.Wrappers.Option<RAST._IExpr>.Default());
+    public static RAST._IFn Default() {
+      return theDefault;
+    }
+    private static readonly Dafny.TypeDescriptor<RAST._IFn> _TYPE = new Dafny.TypeDescriptor<RAST._IFn>(RAST.Fn.Default());
+    public static Dafny.TypeDescriptor<RAST._IFn> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static _IFn create(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<RAST._ITypeParam> typeParams, Dafny.ISequence<RAST._IFormal> formals, Std.Wrappers._IOption<RAST._IType> returnType, Dafny.ISequence<Dafny.Rune> @where, Std.Wrappers._IOption<RAST._IExpr> body) {
+      return new Fn(name, typeParams, formals, returnType, @where, body);
+    }
+    public static _IFn create_Fn(Dafny.ISequence<Dafny.Rune> name, Dafny.ISequence<RAST._ITypeParam> typeParams, Dafny.ISequence<RAST._IFormal> formals, Std.Wrappers._IOption<RAST._IType> returnType, Dafny.ISequence<Dafny.Rune> @where, Std.Wrappers._IOption<RAST._IExpr> body) {
+      return create(name, typeParams, formals, returnType, @where, body);
+    }
+    public bool is_Fn { get { return true; } }
+    public Dafny.ISequence<Dafny.Rune> dtor_name {
+      get {
+        return this._name;
+      }
+    }
+    public Dafny.ISequence<RAST._ITypeParam> dtor_typeParams {
+      get {
+        return this._typeParams;
+      }
+    }
+    public Dafny.ISequence<RAST._IFormal> dtor_formals {
+      get {
+        return this._formals;
+      }
+    }
+    public Std.Wrappers._IOption<RAST._IType> dtor_returnType {
+      get {
+        return this._returnType;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> dtor_where {
+      get {
+        return this._where;
+      }
+    }
+    public Std.Wrappers._IOption<RAST._IExpr> dtor_body {
+      get {
+        return this._body;
+      }
+    }
+    public Dafny.ISequence<Dafny.Rune> _ToString(Dafny.ISequence<Dafny.Rune> ind) {
+      var _pat_let_tv5 = ind;
+      var _pat_let_tv6 = ind;
+      var _pat_let_tv7 = ind;
+      var _pat_let_tv8 = ind;
+      return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("fn "), (this).dtor_name), RAST.TypeParam.ToStringMultiple((this).dtor_typeParams, ind)), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("(")), RAST.__default.SeqToString<RAST._IFormal>((this).dtor_formals, Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, Func<RAST._IFormal, Dafny.ISequence<Dafny.Rune>>>>((_1827_ind) => ((System.Func<RAST._IFormal, Dafny.ISequence<Dafny.Rune>>)((_1828_formal) => {
+        return (_1828_formal)._ToString(_1827_ind);
+      })))(ind), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(", "))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString(")")), ((System.Func<Std.Wrappers._IOption<RAST._IType>, Dafny.ISequence<Dafny.Rune>>)((_source53) => {
+        if (_source53.is_None) {
+          return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
+        } else {
+          RAST._IType _1829___mcc_h0 = _source53.dtor_value;
+          RAST._IType _1830_t = _1829___mcc_h0;
+          return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" -> "), (_1830_t)._ToString(_pat_let_tv5));
+        }
+      }))((this).dtor_returnType)), ((((this).dtor_where).Equals(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(""))) ? (Dafny.Sequence<Dafny.Rune>.UnicodeFromString("")) : (Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n"), ind), RAST.__default.IND), (this).dtor_where)))), ((System.Func<Std.Wrappers._IOption<RAST._IExpr>, Dafny.ISequence<Dafny.Rune>>)((_source54) => {
+        if (_source54.is_None) {
+          return Dafny.Sequence<Dafny.Rune>.UnicodeFromString(";");
+        } else {
+          RAST._IExpr _1831___mcc_h2 = _source54.dtor_value;
+          RAST._IExpr _1832_body = _1831___mcc_h2;
+          return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.UnicodeFromString(" {\n"), _pat_let_tv6), RAST.__default.IND), (_1832_body)._ToString(Dafny.Sequence<Dafny.Rune>.Concat(_pat_let_tv7, RAST.__default.IND))), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("\n")), _pat_let_tv8), Dafny.Sequence<Dafny.Rune>.UnicodeFromString("}"));
+        }
+      }))((this).dtor_body));
+    }
+  }
+} // end of namespace RAST
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/ResolvedDesugaredExecutableDafnyPlugin.cs b/Source/DafnyCore/GeneratedFromDafny/ResolvedDesugaredExecutableDafnyPlugin.cs
new file mode 100644
index 00000000000..b157ecc9685
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/ResolvedDesugaredExecutableDafnyPlugin.cs
@@ -0,0 +1,33 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace ResolvedDesugaredExecutableDafnyPlugin {
+
+
+  public partial class COMP {
+    public COMP() {
+    }
+    public static Dafny.ISequence<Dafny.Rune> Compile(Dafny.ISequence<DAST._IModule> p)
+    {
+      Dafny.ISequence<Dafny.Rune> s = Dafny.Sequence<Dafny.Rune>.Empty;
+      Dafny.ISequence<Dafny.Rune> _out14;
+      _out14 = D2DPrettyPrinter.__default.PrettyPrint(p);
+      s = _out14;
+      return s;
+    }
+    public static Dafny.ISequence<Dafny.Rune> EmitCallToMain(Dafny.ISequence<Dafny.ISequence<Dafny.Rune>> fullName)
+    {
+      Dafny.ISequence<Dafny.Rune> s = Dafny.Sequence<Dafny.Rune>.Empty;
+      s = Dafny.Sequence<Dafny.Rune>.UnicodeFromString("");
+      return s;
+    }
+  }
+} // end of namespace ResolvedDesugaredExecutableDafnyPlugin
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic.cs b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic.cs
new file mode 100644
index 00000000000..fd436cb0724
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic.cs
@@ -0,0 +1,14 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace Std.Arithmetic {
+
+} // end of namespace Std.Arithmetic
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_DivInternals.cs b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_DivInternals.cs
new file mode 100644
index 00000000000..7b7cf35f4f2
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_DivInternals.cs
@@ -0,0 +1,46 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace Std.Arithmetic.DivInternals {
+
+  public partial class __default {
+    public static BigInteger DivPos(BigInteger x, BigInteger d)
+    {
+      BigInteger _150___accumulator = BigInteger.Zero;
+    TAIL_CALL_START: ;
+      if ((x).Sign == -1) {
+        _150___accumulator = (_150___accumulator) + (new BigInteger(-1));
+        BigInteger _in38 = (x) + (d);
+        BigInteger _in39 = d;
+        x = _in38;
+        d = _in39;
+        goto TAIL_CALL_START;
+      } else if ((x) < (d)) {
+        return (BigInteger.Zero) + (_150___accumulator);
+      } else {
+        _150___accumulator = (_150___accumulator) + (BigInteger.One);
+        BigInteger _in40 = (x) - (d);
+        BigInteger _in41 = d;
+        x = _in40;
+        d = _in41;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static BigInteger DivRecursive(BigInteger x, BigInteger d)
+    {
+      if ((d).Sign == 1) {
+        return Std.Arithmetic.DivInternals.__default.DivPos(x, d);
+      } else {
+        return (new BigInteger(-1)) * (Std.Arithmetic.DivInternals.__default.DivPos(x, (new BigInteger(-1)) * (d)));
+      }
+    }
+  }
+} // end of namespace Std.Arithmetic.DivInternals
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_DivInternalsNonlinear.cs b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_DivInternalsNonlinear.cs
new file mode 100644
index 00000000000..1cb3e322f6d
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_DivInternalsNonlinear.cs
@@ -0,0 +1,14 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace Std.Arithmetic.DivInternalsNonlinear {
+
+} // end of namespace Std.Arithmetic.DivInternalsNonlinear
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_DivMod.cs b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_DivMod.cs
new file mode 100644
index 00000000000..6f44e6546e6
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_DivMod.cs
@@ -0,0 +1,20 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace Std.Arithmetic.DivMod {
+
+  public partial class __default {
+    public static bool MultiplesVanish(BigInteger a, BigInteger b, BigInteger m)
+    {
+      return (Dafny.Helpers.EuclideanModulus(((m) * (a)) + (b), m)) == (Dafny.Helpers.EuclideanModulus(b, m));
+    }
+  }
+} // end of namespace Std.Arithmetic.DivMod
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_GeneralInternals.cs b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_GeneralInternals.cs
new file mode 100644
index 00000000000..af3ea448344
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_GeneralInternals.cs
@@ -0,0 +1,14 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace Std.Arithmetic.GeneralInternals {
+
+} // end of namespace Std.Arithmetic.GeneralInternals
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_Logarithm.cs b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_Logarithm.cs
new file mode 100644
index 00000000000..ca62b66e443
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_Logarithm.cs
@@ -0,0 +1,31 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace Std.Arithmetic.Logarithm {
+
+  public partial class __default {
+    public static BigInteger Log(BigInteger @base, BigInteger pow)
+    {
+      BigInteger _152___accumulator = BigInteger.Zero;
+    TAIL_CALL_START: ;
+      if ((pow) < (@base)) {
+        return (BigInteger.Zero) + (_152___accumulator);
+      } else {
+        _152___accumulator = (_152___accumulator) + (BigInteger.One);
+        BigInteger _in44 = @base;
+        BigInteger _in45 = Dafny.Helpers.EuclideanDivision(pow, @base);
+        @base = _in44;
+        pow = _in45;
+        goto TAIL_CALL_START;
+      }
+    }
+  }
+} // end of namespace Std.Arithmetic.Logarithm
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_ModInternals.cs b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_ModInternals.cs
new file mode 100644
index 00000000000..a3707de82d9
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_ModInternals.cs
@@ -0,0 +1,35 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace Std.Arithmetic.ModInternals {
+
+  public partial class __default {
+    public static BigInteger ModRecursive(BigInteger x, BigInteger d)
+    {
+    TAIL_CALL_START: ;
+      if ((x).Sign == -1) {
+        BigInteger _in34 = (d) + (x);
+        BigInteger _in35 = d;
+        x = _in34;
+        d = _in35;
+        goto TAIL_CALL_START;
+      } else if ((x) < (d)) {
+        return x;
+      } else {
+        BigInteger _in36 = (x) - (d);
+        BigInteger _in37 = d;
+        x = _in36;
+        d = _in37;
+        goto TAIL_CALL_START;
+      }
+    }
+  }
+} // end of namespace Std.Arithmetic.ModInternals
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_ModInternalsNonlinear.cs b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_ModInternalsNonlinear.cs
new file mode 100644
index 00000000000..d283e6740c8
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_ModInternalsNonlinear.cs
@@ -0,0 +1,14 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace Std.Arithmetic.ModInternalsNonlinear {
+
+} // end of namespace Std.Arithmetic.ModInternalsNonlinear
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_Mul.cs b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_Mul.cs
new file mode 100644
index 00000000000..55e8945e646
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_Mul.cs
@@ -0,0 +1,14 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace Std.Arithmetic.Mul {
+
+} // end of namespace Std.Arithmetic.Mul
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_MulInternals.cs b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_MulInternals.cs
new file mode 100644
index 00000000000..2b739575c7d
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_MulInternals.cs
@@ -0,0 +1,39 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace Std.Arithmetic.MulInternals {
+
+  public partial class __default {
+    public static BigInteger MulPos(BigInteger x, BigInteger y)
+    {
+      BigInteger _149___accumulator = BigInteger.Zero;
+    TAIL_CALL_START: ;
+      if ((x).Sign == 0) {
+        return (BigInteger.Zero) + (_149___accumulator);
+      } else {
+        _149___accumulator = (_149___accumulator) + (y);
+        BigInteger _in32 = (x) - (BigInteger.One);
+        BigInteger _in33 = y;
+        x = _in32;
+        y = _in33;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static BigInteger MulRecursive(BigInteger x, BigInteger y)
+    {
+      if ((x).Sign != -1) {
+        return Std.Arithmetic.MulInternals.__default.MulPos(x, y);
+      } else {
+        return (new BigInteger(-1)) * (Std.Arithmetic.MulInternals.__default.MulPos((new BigInteger(-1)) * (x), y));
+      }
+    }
+  }
+} // end of namespace Std.Arithmetic.MulInternals
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_MulInternalsNonlinear.cs b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_MulInternalsNonlinear.cs
new file mode 100644
index 00000000000..9b6610c8a89
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_MulInternalsNonlinear.cs
@@ -0,0 +1,14 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace Std.Arithmetic.MulInternalsNonlinear {
+
+} // end of namespace Std.Arithmetic.MulInternalsNonlinear
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_Power.cs b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_Power.cs
new file mode 100644
index 00000000000..8ba9620f197
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_Power.cs
@@ -0,0 +1,31 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace Std.Arithmetic.Power {
+
+  public partial class __default {
+    public static BigInteger Pow(BigInteger b, BigInteger e)
+    {
+      BigInteger _151___accumulator = BigInteger.One;
+    TAIL_CALL_START: ;
+      if ((e).Sign == 0) {
+        return (BigInteger.One) * (_151___accumulator);
+      } else {
+        _151___accumulator = (_151___accumulator) * (b);
+        BigInteger _in42 = b;
+        BigInteger _in43 = (e) - (BigInteger.One);
+        b = _in42;
+        e = _in43;
+        goto TAIL_CALL_START;
+      }
+    }
+  }
+} // end of namespace Std.Arithmetic.Power
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_Power2.cs b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_Power2.cs
new file mode 100644
index 00000000000..27de265928c
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/Std_Arithmetic_Power2.cs
@@ -0,0 +1,19 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace Std.Arithmetic.Power2 {
+
+  public partial class __default {
+    public static BigInteger Pow2(BigInteger e) {
+      return Std.Arithmetic.Power.__default.Pow(new BigInteger(2), e);
+    }
+  }
+} // end of namespace Std.Arithmetic.Power2
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/Std_Collections_Seq.cs b/Source/DafnyCore/GeneratedFromDafny/Std_Collections_Seq.cs
new file mode 100644
index 00000000000..2d19b7d85da
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/Std_Collections_Seq.cs
@@ -0,0 +1,422 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace Std.Collections.Seq {
+
+  public partial class __default {
+    public static __T First<__T>(Dafny.ISequence<__T> xs) {
+      return (xs).Select(BigInteger.Zero);
+    }
+    public static Dafny.ISequence<__T> DropFirst<__T>(Dafny.ISequence<__T> xs) {
+      return (xs).Drop(BigInteger.One);
+    }
+    public static __T Last<__T>(Dafny.ISequence<__T> xs) {
+      return (xs).Select((new BigInteger((xs).Count)) - (BigInteger.One));
+    }
+    public static Dafny.ISequence<__T> DropLast<__T>(Dafny.ISequence<__T> xs) {
+      return (xs).Take((new BigInteger((xs).Count)) - (BigInteger.One));
+    }
+    public static __T[] ToArray<__T>(Dafny.ISequence<__T> xs)
+    {
+      __T[] a = new __T[0];
+      Func<BigInteger, __T> _init2 = Dafny.Helpers.Id<Func<Dafny.ISequence<__T>, Func<BigInteger, __T>>>((_83_xs) => ((System.Func<BigInteger, __T>)((_84_i) => {
+        return (_83_xs).Select(_84_i);
+      })))(xs);
+      __T[] _nw3 = new __T[Dafny.Helpers.ToIntChecked(new BigInteger((xs).Count), "array size exceeds memory limit")];
+      for (var _i0_2 = 0; _i0_2 < new BigInteger(_nw3.Length); _i0_2++) {
+        _nw3[(int)(_i0_2)] = _init2(_i0_2);
+      }
+      a = _nw3;
+      return a;
+    }
+    public static Dafny.ISet<__T> ToSet<__T>(Dafny.ISequence<__T> xs) {
+      return Dafny.Helpers.Id<Func<Dafny.ISequence<__T>, Dafny.ISet<__T>>>((_85_xs) => ((System.Func<Dafny.ISet<__T>>)(() => {
+        var _coll0 = new System.Collections.Generic.List<__T>();
+        foreach (__T _compr_0 in (_85_xs).CloneAsArray()) {
+          __T _86_x = (__T)_compr_0;
+          if ((_85_xs).Contains(_86_x)) {
+            _coll0.Add(_86_x);
+          }
+        }
+        return Dafny.Set<__T>.FromCollection(_coll0);
+      }))())(xs);
+    }
+    public static BigInteger IndexOf<__T>(Dafny.ISequence<__T> xs, __T v)
+    {
+      BigInteger _87___accumulator = BigInteger.Zero;
+    TAIL_CALL_START: ;
+      if (object.Equals((xs).Select(BigInteger.Zero), v)) {
+        return (BigInteger.Zero) + (_87___accumulator);
+      } else {
+        _87___accumulator = (_87___accumulator) + (BigInteger.One);
+        Dafny.ISequence<__T> _in0 = (xs).Drop(BigInteger.One);
+        __T _in1 = v;
+        xs = _in0;
+        v = _in1;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static Std.Wrappers._IOption<BigInteger> IndexOfOption<__T>(Dafny.ISequence<__T> xs, __T v)
+    {
+      return Std.Collections.Seq.__default.IndexByOption<__T>(xs, Dafny.Helpers.Id<Func<__T, Func<__T, bool>>>((_88_v) => ((System.Func<__T, bool>)((_89_x) => {
+        return object.Equals(_89_x, _88_v);
+      })))(v));
+    }
+    public static Std.Wrappers._IOption<BigInteger> IndexByOption<__T>(Dafny.ISequence<__T> xs, Func<__T, bool> p)
+    {
+      if ((new BigInteger((xs).Count)).Sign == 0) {
+        return Std.Wrappers.Option<BigInteger>.create_None();
+      } else if (Dafny.Helpers.Id<Func<__T, bool>>(p)((xs).Select(BigInteger.Zero))) {
+        return Std.Wrappers.Option<BigInteger>.create_Some(BigInteger.Zero);
+      } else {
+        Std.Wrappers._IOption<BigInteger> _90_o_k = Std.Collections.Seq.__default.IndexByOption<__T>((xs).Drop(BigInteger.One), p);
+        if ((_90_o_k).is_Some) {
+          return Std.Wrappers.Option<BigInteger>.create_Some(((_90_o_k).dtor_value) + (BigInteger.One));
+        } else {
+          return Std.Wrappers.Option<BigInteger>.create_None();
+        }
+      }
+    }
+    public static BigInteger LastIndexOf<__T>(Dafny.ISequence<__T> xs, __T v)
+    {
+    TAIL_CALL_START: ;
+      if (object.Equals((xs).Select((new BigInteger((xs).Count)) - (BigInteger.One)), v)) {
+        return (new BigInteger((xs).Count)) - (BigInteger.One);
+      } else {
+        Dafny.ISequence<__T> _in2 = (xs).Take((new BigInteger((xs).Count)) - (BigInteger.One));
+        __T _in3 = v;
+        xs = _in2;
+        v = _in3;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static Std.Wrappers._IOption<BigInteger> LastIndexOfOption<__T>(Dafny.ISequence<__T> xs, __T v)
+    {
+      return Std.Collections.Seq.__default.LastIndexByOption<__T>(xs, Dafny.Helpers.Id<Func<__T, Func<__T, bool>>>((_91_v) => ((System.Func<__T, bool>)((_92_x) => {
+        return object.Equals(_92_x, _91_v);
+      })))(v));
+    }
+    public static Std.Wrappers._IOption<BigInteger> LastIndexByOption<__T>(Dafny.ISequence<__T> xs, Func<__T, bool> p)
+    {
+    TAIL_CALL_START: ;
+      if ((new BigInteger((xs).Count)).Sign == 0) {
+        return Std.Wrappers.Option<BigInteger>.create_None();
+      } else if (Dafny.Helpers.Id<Func<__T, bool>>(p)((xs).Select((new BigInteger((xs).Count)) - (BigInteger.One)))) {
+        return Std.Wrappers.Option<BigInteger>.create_Some((new BigInteger((xs).Count)) - (BigInteger.One));
+      } else {
+        Dafny.ISequence<__T> _in4 = (xs).Take((new BigInteger((xs).Count)) - (BigInteger.One));
+        Func<__T, bool> _in5 = p;
+        xs = _in4;
+        p = _in5;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static Dafny.ISequence<__T> Remove<__T>(Dafny.ISequence<__T> xs, BigInteger pos)
+    {
+      return Dafny.Sequence<__T>.Concat((xs).Take(pos), (xs).Drop((pos) + (BigInteger.One)));
+    }
+    public static Dafny.ISequence<__T> RemoveValue<__T>(Dafny.ISequence<__T> xs, __T v)
+    {
+      if (!(xs).Contains(v)) {
+        return xs;
+      } else {
+        BigInteger _93_i = Std.Collections.Seq.__default.IndexOf<__T>(xs, v);
+        return Dafny.Sequence<__T>.Concat((xs).Take(_93_i), (xs).Drop((_93_i) + (BigInteger.One)));
+      }
+    }
+    public static Dafny.ISequence<__T> Insert<__T>(Dafny.ISequence<__T> xs, __T a, BigInteger pos)
+    {
+      return Dafny.Sequence<__T>.Concat(Dafny.Sequence<__T>.Concat((xs).Take(pos), Dafny.Sequence<__T>.FromElements(a)), (xs).Drop(pos));
+    }
+    public static Dafny.ISequence<__T> Reverse<__T>(Dafny.ISequence<__T> xs) {
+      Dafny.ISequence<__T> _94___accumulator = Dafny.Sequence<__T>.FromElements();
+    TAIL_CALL_START: ;
+      if ((xs).Equals(Dafny.Sequence<__T>.FromElements())) {
+        return Dafny.Sequence<__T>.Concat(_94___accumulator, Dafny.Sequence<__T>.FromElements());
+      } else {
+        _94___accumulator = Dafny.Sequence<__T>.Concat(_94___accumulator, Dafny.Sequence<__T>.FromElements((xs).Select((new BigInteger((xs).Count)) - (BigInteger.One))));
+        Dafny.ISequence<__T> _in6 = (xs).Subsequence(BigInteger.Zero, (new BigInteger((xs).Count)) - (BigInteger.One));
+        xs = _in6;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static Dafny.ISequence<__T> Repeat<__T>(__T v, BigInteger length)
+    {
+      Dafny.ISequence<__T> _95___accumulator = Dafny.Sequence<__T>.FromElements();
+    TAIL_CALL_START: ;
+      if ((length).Sign == 0) {
+        return Dafny.Sequence<__T>.Concat(_95___accumulator, Dafny.Sequence<__T>.FromElements());
+      } else {
+        _95___accumulator = Dafny.Sequence<__T>.Concat(_95___accumulator, Dafny.Sequence<__T>.FromElements(v));
+        __T _in7 = v;
+        BigInteger _in8 = (length) - (BigInteger.One);
+        v = _in7;
+        length = _in8;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static _System._ITuple2<Dafny.ISequence<__A>, Dafny.ISequence<__B>> Unzip<__A, __B>(Dafny.ISequence<_System._ITuple2<__A, __B>> xs) {
+      if ((new BigInteger((xs).Count)).Sign == 0) {
+        return _System.Tuple2<Dafny.ISequence<__A>, Dafny.ISequence<__B>>.create(Dafny.Sequence<__A>.FromElements(), Dafny.Sequence<__B>.FromElements());
+      } else {
+        _System._ITuple2<Dafny.ISequence<__A>, Dafny.ISequence<__B>> _let_tmp_rhs0 = Std.Collections.Seq.__default.Unzip<__A, __B>(Std.Collections.Seq.__default.DropLast<_System._ITuple2<__A, __B>>(xs));
+        Dafny.ISequence<__A> _96_a = _let_tmp_rhs0.dtor__0;
+        Dafny.ISequence<__B> _97_b = _let_tmp_rhs0.dtor__1;
+        return _System.Tuple2<Dafny.ISequence<__A>, Dafny.ISequence<__B>>.create(Dafny.Sequence<__A>.Concat(_96_a, Dafny.Sequence<__A>.FromElements((Std.Collections.Seq.__default.Last<_System._ITuple2<__A, __B>>(xs)).dtor__0)), Dafny.Sequence<__B>.Concat(_97_b, Dafny.Sequence<__B>.FromElements((Std.Collections.Seq.__default.Last<_System._ITuple2<__A, __B>>(xs)).dtor__1)));
+      }
+    }
+    public static Dafny.ISequence<_System._ITuple2<__A, __B>> Zip<__A, __B>(Dafny.ISequence<__A> xs, Dafny.ISequence<__B> ys)
+    {
+      Dafny.ISequence<_System._ITuple2<__A, __B>> _98___accumulator = Dafny.Sequence<_System._ITuple2<__A, __B>>.FromElements();
+    TAIL_CALL_START: ;
+      if ((new BigInteger((xs).Count)).Sign == 0) {
+        return Dafny.Sequence<_System._ITuple2<__A, __B>>.Concat(Dafny.Sequence<_System._ITuple2<__A, __B>>.FromElements(), _98___accumulator);
+      } else {
+        _98___accumulator = Dafny.Sequence<_System._ITuple2<__A, __B>>.Concat(Dafny.Sequence<_System._ITuple2<__A, __B>>.FromElements(_System.Tuple2<__A, __B>.create(Std.Collections.Seq.__default.Last<__A>(xs), Std.Collections.Seq.__default.Last<__B>(ys))), _98___accumulator);
+        Dafny.ISequence<__A> _in9 = Std.Collections.Seq.__default.DropLast<__A>(xs);
+        Dafny.ISequence<__B> _in10 = Std.Collections.Seq.__default.DropLast<__B>(ys);
+        xs = _in9;
+        ys = _in10;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static BigInteger Max(Dafny.ISequence<BigInteger> xs) {
+      if ((new BigInteger((xs).Count)) == (BigInteger.One)) {
+        return (xs).Select(BigInteger.Zero);
+      } else {
+        return Std.Math.__default.Max((xs).Select(BigInteger.Zero), Std.Collections.Seq.__default.Max((xs).Drop(BigInteger.One)));
+      }
+    }
+    public static BigInteger Min(Dafny.ISequence<BigInteger> xs) {
+      if ((new BigInteger((xs).Count)) == (BigInteger.One)) {
+        return (xs).Select(BigInteger.Zero);
+      } else {
+        return Std.Math.__default.Min((xs).Select(BigInteger.Zero), Std.Collections.Seq.__default.Min((xs).Drop(BigInteger.One)));
+      }
+    }
+    public static Dafny.ISequence<__T> Flatten<__T>(Dafny.ISequence<Dafny.ISequence<__T>> xs) {
+      Dafny.ISequence<__T> _99___accumulator = Dafny.Sequence<__T>.FromElements();
+    TAIL_CALL_START: ;
+      if ((new BigInteger((xs).Count)).Sign == 0) {
+        return Dafny.Sequence<__T>.Concat(_99___accumulator, Dafny.Sequence<__T>.FromElements());
+      } else {
+        _99___accumulator = Dafny.Sequence<__T>.Concat(_99___accumulator, (xs).Select(BigInteger.Zero));
+        Dafny.ISequence<Dafny.ISequence<__T>> _in11 = (xs).Drop(BigInteger.One);
+        xs = _in11;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static Dafny.ISequence<__T> FlattenReverse<__T>(Dafny.ISequence<Dafny.ISequence<__T>> xs) {
+      Dafny.ISequence<__T> _100___accumulator = Dafny.Sequence<__T>.FromElements();
+    TAIL_CALL_START: ;
+      if ((new BigInteger((xs).Count)).Sign == 0) {
+        return Dafny.Sequence<__T>.Concat(Dafny.Sequence<__T>.FromElements(), _100___accumulator);
+      } else {
+        _100___accumulator = Dafny.Sequence<__T>.Concat(Std.Collections.Seq.__default.Last<Dafny.ISequence<__T>>(xs), _100___accumulator);
+        Dafny.ISequence<Dafny.ISequence<__T>> _in12 = Std.Collections.Seq.__default.DropLast<Dafny.ISequence<__T>>(xs);
+        xs = _in12;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static Dafny.ISequence<__T> Join<__T>(Dafny.ISequence<Dafny.ISequence<__T>> seqs, Dafny.ISequence<__T> separator)
+    {
+      Dafny.ISequence<__T> _101___accumulator = Dafny.Sequence<__T>.FromElements();
+    TAIL_CALL_START: ;
+      if ((new BigInteger((seqs).Count)).Sign == 0) {
+        return Dafny.Sequence<__T>.Concat(_101___accumulator, Dafny.Sequence<__T>.FromElements());
+      } else if ((new BigInteger((seqs).Count)) == (BigInteger.One)) {
+        return Dafny.Sequence<__T>.Concat(_101___accumulator, (seqs).Select(BigInteger.Zero));
+      } else {
+        _101___accumulator = Dafny.Sequence<__T>.Concat(_101___accumulator, Dafny.Sequence<__T>.Concat((seqs).Select(BigInteger.Zero), separator));
+        Dafny.ISequence<Dafny.ISequence<__T>> _in13 = (seqs).Drop(BigInteger.One);
+        Dafny.ISequence<__T> _in14 = separator;
+        seqs = _in13;
+        separator = _in14;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static Dafny.ISequence<Dafny.ISequence<__T>> Split<__T>(Dafny.ISequence<__T> s, __T delim)
+    {
+      Dafny.ISequence<Dafny.ISequence<__T>> _102___accumulator = Dafny.Sequence<Dafny.ISequence<__T>>.FromElements();
+    TAIL_CALL_START: ;
+      Std.Wrappers._IOption<BigInteger> _103_i = Std.Collections.Seq.__default.IndexOfOption<__T>(s, delim);
+      if ((_103_i).is_Some) {
+        _102___accumulator = Dafny.Sequence<Dafny.ISequence<__T>>.Concat(_102___accumulator, Dafny.Sequence<Dafny.ISequence<__T>>.FromElements((s).Take((_103_i).dtor_value)));
+        Dafny.ISequence<__T> _in15 = (s).Drop(((_103_i).dtor_value) + (BigInteger.One));
+        __T _in16 = delim;
+        s = _in15;
+        delim = _in16;
+        goto TAIL_CALL_START;
+      } else {
+        return Dafny.Sequence<Dafny.ISequence<__T>>.Concat(_102___accumulator, Dafny.Sequence<Dafny.ISequence<__T>>.FromElements(s));
+      }
+    }
+    public static _System._ITuple2<Dafny.ISequence<__T>, Dafny.ISequence<__T>> SplitOnce<__T>(Dafny.ISequence<__T> s, __T delim)
+    {
+      Std.Wrappers._IOption<BigInteger> _104_i = Std.Collections.Seq.__default.IndexOfOption<__T>(s, delim);
+      return _System.Tuple2<Dafny.ISequence<__T>, Dafny.ISequence<__T>>.create((s).Take((_104_i).dtor_value), (s).Drop(((_104_i).dtor_value) + (BigInteger.One)));
+    }
+    public static Std.Wrappers._IOption<_System._ITuple2<Dafny.ISequence<__T>, Dafny.ISequence<__T>>> SplitOnceOption<__T>(Dafny.ISequence<__T> s, __T delim)
+    {
+      Std.Wrappers._IOption<BigInteger> _105_valueOrError0 = Std.Collections.Seq.__default.IndexOfOption<__T>(s, delim);
+      if ((_105_valueOrError0).IsFailure()) {
+        return (_105_valueOrError0).PropagateFailure<_System._ITuple2<Dafny.ISequence<__T>, Dafny.ISequence<__T>>>();
+      } else {
+        BigInteger _106_i = (_105_valueOrError0).Extract();
+        return Std.Wrappers.Option<_System._ITuple2<Dafny.ISequence<__T>, Dafny.ISequence<__T>>>.create_Some(_System.Tuple2<Dafny.ISequence<__T>, Dafny.ISequence<__T>>.create((s).Take(_106_i), (s).Drop((_106_i) + (BigInteger.One))));
+      }
+    }
+    public static Dafny.ISequence<__R> Map<__T, __R>(Func<__T, __R> f, Dafny.ISequence<__T> xs)
+    {
+      Dafny.ISequence<__R> _107___accumulator = Dafny.Sequence<__R>.FromElements();
+    TAIL_CALL_START: ;
+      if ((new BigInteger((xs).Count)).Sign == 0) {
+        return Dafny.Sequence<__R>.Concat(_107___accumulator, Dafny.Sequence<__R>.FromElements());
+      } else {
+        _107___accumulator = Dafny.Sequence<__R>.Concat(_107___accumulator, Dafny.Sequence<__R>.FromElements(Dafny.Helpers.Id<Func<__T, __R>>(f)((xs).Select(BigInteger.Zero))));
+        Func<__T, __R> _in17 = f;
+        Dafny.ISequence<__T> _in18 = (xs).Drop(BigInteger.One);
+        f = _in17;
+        xs = _in18;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static Std.Wrappers._IResult<Dafny.ISequence<__R>, __E> MapWithResult<__T, __R, __E>(Func<__T, Std.Wrappers._IResult<__R, __E>> f, Dafny.ISequence<__T> xs)
+    {
+      if ((new BigInteger((xs).Count)).Sign == 0) {
+        return Std.Wrappers.Result<Dafny.ISequence<__R>, __E>.create_Success(Dafny.Sequence<__R>.FromElements());
+      } else {
+        Std.Wrappers._IResult<__R, __E> _108_valueOrError0 = Dafny.Helpers.Id<Func<__T, Std.Wrappers._IResult<__R, __E>>>(f)((xs).Select(BigInteger.Zero));
+        if ((_108_valueOrError0).IsFailure()) {
+          return (_108_valueOrError0).PropagateFailure<Dafny.ISequence<__R>>();
+        } else {
+          __R _109_head = (_108_valueOrError0).Extract();
+          Std.Wrappers._IResult<Dafny.ISequence<__R>, __E> _110_valueOrError1 = Std.Collections.Seq.__default.MapWithResult<__T, __R, __E>(f, (xs).Drop(BigInteger.One));
+          if ((_110_valueOrError1).IsFailure()) {
+            return (_110_valueOrError1).PropagateFailure<Dafny.ISequence<__R>>();
+          } else {
+            Dafny.ISequence<__R> _111_tail = (_110_valueOrError1).Extract();
+            return Std.Wrappers.Result<Dafny.ISequence<__R>, __E>.create_Success(Dafny.Sequence<__R>.Concat(Dafny.Sequence<__R>.FromElements(_109_head), _111_tail));
+          }
+        }
+      }
+    }
+    public static Dafny.ISequence<__T> Filter<__T>(Func<__T, bool> f, Dafny.ISequence<__T> xs)
+    {
+      Dafny.ISequence<__T> _112___accumulator = Dafny.Sequence<__T>.FromElements();
+    TAIL_CALL_START: ;
+      if ((new BigInteger((xs).Count)).Sign == 0) {
+        return Dafny.Sequence<__T>.Concat(_112___accumulator, Dafny.Sequence<__T>.FromElements());
+      } else {
+        _112___accumulator = Dafny.Sequence<__T>.Concat(_112___accumulator, ((Dafny.Helpers.Id<Func<__T, bool>>(f)((xs).Select(BigInteger.Zero))) ? (Dafny.Sequence<__T>.FromElements((xs).Select(BigInteger.Zero))) : (Dafny.Sequence<__T>.FromElements())));
+        Func<__T, bool> _in19 = f;
+        Dafny.ISequence<__T> _in20 = (xs).Drop(BigInteger.One);
+        f = _in19;
+        xs = _in20;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static __A FoldLeft<__A, __T>(Func<__A, __T, __A> f, __A init, Dafny.ISequence<__T> xs)
+    {
+    TAIL_CALL_START: ;
+      if ((new BigInteger((xs).Count)).Sign == 0) {
+        return init;
+      } else {
+        Func<__A, __T, __A> _in21 = f;
+        __A _in22 = Dafny.Helpers.Id<Func<__A, __T, __A>>(f)(init, (xs).Select(BigInteger.Zero));
+        Dafny.ISequence<__T> _in23 = (xs).Drop(BigInteger.One);
+        f = _in21;
+        init = _in22;
+        xs = _in23;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static __A FoldRight<__A, __T>(Func<__T, __A, __A> f, Dafny.ISequence<__T> xs, __A init)
+    {
+      if ((new BigInteger((xs).Count)).Sign == 0) {
+        return init;
+      } else {
+        return Dafny.Helpers.Id<Func<__T, __A, __A>>(f)((xs).Select(BigInteger.Zero), Std.Collections.Seq.__default.FoldRight<__A, __T>(f, (xs).Drop(BigInteger.One), init));
+      }
+    }
+    public static Dafny.ISequence<__T> SetToSeq<__T>(Dafny.ISet<__T> s)
+    {
+      Dafny.ISequence<__T> xs = Dafny.Sequence<__T>.Empty;
+      xs = Dafny.Sequence<__T>.FromElements();
+      Dafny.ISet<__T> _113_left;
+      _113_left = s;
+      while (!(_113_left).Equals(Dafny.Set<__T>.FromElements())) {
+        __T _114_x;
+        foreach (__T _assign_such_that_0 in (_113_left).Elements) {
+          _114_x = (__T)_assign_such_that_0;
+          if ((_113_left).Contains(_114_x)) {
+            goto after__ASSIGN_SUCH_THAT_0;
+          }
+        }
+        throw new System.Exception("assign-such-that search produced no value (line 7247)");
+      after__ASSIGN_SUCH_THAT_0: ;
+        _113_left = Dafny.Set<__T>.Difference(_113_left, Dafny.Set<__T>.FromElements(_114_x));
+        xs = Dafny.Sequence<__T>.Concat(xs, Dafny.Sequence<__T>.FromElements(_114_x));
+      }
+      return xs;
+    }
+    public static Dafny.ISequence<__T> SetToSortedSeq<__T>(Dafny.ISet<__T> s, Func<__T, __T, bool> R)
+    {
+      Dafny.ISequence<__T> xs = Dafny.Sequence<__T>.Empty;
+      Dafny.ISequence<__T> _out6;
+      _out6 = Std.Collections.Seq.__default.SetToSeq<__T>(s);
+      xs = _out6;
+      xs = Std.Collections.Seq.__default.MergeSortBy<__T>(R, xs);
+      return xs;
+    }
+    public static Dafny.ISequence<__T> MergeSortBy<__T>(Func<__T, __T, bool> lessThanOrEq, Dafny.ISequence<__T> a)
+    {
+      if ((new BigInteger((a).Count)) <= (BigInteger.One)) {
+        return a;
+      } else {
+        BigInteger _115_splitIndex = Dafny.Helpers.EuclideanDivision(new BigInteger((a).Count), new BigInteger(2));
+        Dafny.ISequence<__T> _116_left = (a).Take(_115_splitIndex);
+        Dafny.ISequence<__T> _117_right = (a).Drop(_115_splitIndex);
+        Dafny.ISequence<__T> _118_leftSorted = Std.Collections.Seq.__default.MergeSortBy<__T>(lessThanOrEq, _116_left);
+        Dafny.ISequence<__T> _119_rightSorted = Std.Collections.Seq.__default.MergeSortBy<__T>(lessThanOrEq, _117_right);
+        return Std.Collections.Seq.__default.MergeSortedWith<__T>(_118_leftSorted, _119_rightSorted, lessThanOrEq);
+      }
+    }
+    public static Dafny.ISequence<__T> MergeSortedWith<__T>(Dafny.ISequence<__T> left, Dafny.ISequence<__T> right, Func<__T, __T, bool> lessThanOrEq)
+    {
+      Dafny.ISequence<__T> _120___accumulator = Dafny.Sequence<__T>.FromElements();
+    TAIL_CALL_START: ;
+      if ((new BigInteger((left).Count)).Sign == 0) {
+        return Dafny.Sequence<__T>.Concat(_120___accumulator, right);
+      } else if ((new BigInteger((right).Count)).Sign == 0) {
+        return Dafny.Sequence<__T>.Concat(_120___accumulator, left);
+      } else if (Dafny.Helpers.Id<Func<__T, __T, bool>>(lessThanOrEq)((left).Select(BigInteger.Zero), (right).Select(BigInteger.Zero))) {
+        _120___accumulator = Dafny.Sequence<__T>.Concat(_120___accumulator, Dafny.Sequence<__T>.FromElements((left).Select(BigInteger.Zero)));
+        Dafny.ISequence<__T> _in24 = (left).Drop(BigInteger.One);
+        Dafny.ISequence<__T> _in25 = right;
+        Func<__T, __T, bool> _in26 = lessThanOrEq;
+        left = _in24;
+        right = _in25;
+        lessThanOrEq = _in26;
+        goto TAIL_CALL_START;
+      } else {
+        _120___accumulator = Dafny.Sequence<__T>.Concat(_120___accumulator, Dafny.Sequence<__T>.FromElements((right).Select(BigInteger.Zero)));
+        Dafny.ISequence<__T> _in27 = left;
+        Dafny.ISequence<__T> _in28 = (right).Drop(BigInteger.One);
+        Func<__T, __T, bool> _in29 = lessThanOrEq;
+        left = _in27;
+        right = _in28;
+        lessThanOrEq = _in29;
+        goto TAIL_CALL_START;
+      }
+    }
+  }
+} // end of namespace Std.Collections.Seq
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/Std_Math.cs b/Source/DafnyCore/GeneratedFromDafny/Std_Math.cs
new file mode 100644
index 00000000000..20ac317a0d0
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/Std_Math.cs
@@ -0,0 +1,47 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace Std.Math {
+
+  public partial class __default {
+    public static BigInteger Min(BigInteger a, BigInteger b)
+    {
+      if ((a) < (b)) {
+        return a;
+      } else {
+        return b;
+      }
+    }
+    public static BigInteger Min3(BigInteger a, BigInteger b, BigInteger c)
+    {
+      return Std.Math.__default.Min(a, Std.Math.__default.Min(b, c));
+    }
+    public static BigInteger Max(BigInteger a, BigInteger b)
+    {
+      if ((a) < (b)) {
+        return b;
+      } else {
+        return a;
+      }
+    }
+    public static BigInteger Max3(BigInteger a, BigInteger b, BigInteger c)
+    {
+      return Std.Math.__default.Max(a, Std.Math.__default.Max(b, c));
+    }
+    public static BigInteger Abs(BigInteger a) {
+      if ((a).Sign == -1) {
+        return (BigInteger.Zero) - (a);
+      } else {
+        return a;
+      }
+    }
+  }
+} // end of namespace Std.Math
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/Std_Strings.cs b/Source/DafnyCore/GeneratedFromDafny/Std_Strings.cs
new file mode 100644
index 00000000000..d4791c5d23e
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/Std_Strings.cs
@@ -0,0 +1,44 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace Std.Strings {
+
+  public partial class __default {
+    public static Dafny.ISequence<Dafny.Rune> OfNat(BigInteger n) {
+      return Std.Strings.DecimalConversion.__default.OfNat(n);
+    }
+    public static Dafny.ISequence<Dafny.Rune> OfInt(BigInteger n) {
+      return Std.Strings.DecimalConversion.__default.OfInt(n, new Dafny.Rune('-'));
+    }
+    public static BigInteger ToNat(Dafny.ISequence<Dafny.Rune> str) {
+      return Std.Strings.DecimalConversion.__default.ToNat(str);
+    }
+    public static BigInteger ToInt(Dafny.ISequence<Dafny.Rune> str) {
+      return Std.Strings.DecimalConversion.__default.ToInt(str, new Dafny.Rune('-'));
+    }
+    public static Dafny.ISequence<Dafny.Rune> EscapeQuotes(Dafny.ISequence<Dafny.Rune> str) {
+      return Std.Strings.CharStrEscaping.__default.Escape(str, Dafny.Set<Dafny.Rune>.FromElements(new Dafny.Rune('\"'), new Dafny.Rune('\'')), new Dafny.Rune('\\'));
+    }
+    public static Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> UnescapeQuotes(Dafny.ISequence<Dafny.Rune> str) {
+      return Std.Strings.CharStrEscaping.__default.Unescape(str, new Dafny.Rune('\\'));
+    }
+    public static Dafny.ISequence<Dafny.Rune> OfBool(bool b) {
+      if (b) {
+        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("true");
+      } else {
+        return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("false");
+      }
+    }
+    public static Dafny.ISequence<Dafny.Rune> OfChar(Dafny.Rune c) {
+      return Dafny.Sequence<Dafny.Rune>.FromElements(c);
+    }
+  }
+} // end of namespace Std.Strings
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/Std_Strings_CharStrEscaping.cs b/Source/DafnyCore/GeneratedFromDafny/Std_Strings_CharStrEscaping.cs
new file mode 100644
index 00000000000..e18889745ae
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/Std_Strings_CharStrEscaping.cs
@@ -0,0 +1,68 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace Std.Strings.CharStrEscaping {
+
+  public partial class __default {
+    public static Dafny.ISequence<Dafny.Rune> Escape(Dafny.ISequence<Dafny.Rune> str, Dafny.ISet<Dafny.Rune> mustEscape, Dafny.Rune escape)
+    {
+      Dafny.ISequence<Dafny.Rune> _191___accumulator = Dafny.Sequence<Dafny.Rune>.FromElements();
+    TAIL_CALL_START: ;
+      if ((str).Equals(Dafny.Sequence<Dafny.Rune>.FromElements())) {
+        return Dafny.Sequence<Dafny.Rune>.Concat(_191___accumulator, str);
+      } else if ((mustEscape).Contains((str).Select(BigInteger.Zero))) {
+        _191___accumulator = Dafny.Sequence<Dafny.Rune>.Concat(_191___accumulator, Dafny.Sequence<Dafny.Rune>.FromElements(escape, (str).Select(BigInteger.Zero)));
+        Dafny.ISequence<Dafny.Rune> _in56 = (str).Drop(BigInteger.One);
+        Dafny.ISet<Dafny.Rune> _in57 = mustEscape;
+        Dafny.Rune _in58 = escape;
+        str = _in56;
+        mustEscape = _in57;
+        escape = _in58;
+        goto TAIL_CALL_START;
+      } else {
+        _191___accumulator = Dafny.Sequence<Dafny.Rune>.Concat(_191___accumulator, Dafny.Sequence<Dafny.Rune>.FromElements((str).Select(BigInteger.Zero)));
+        Dafny.ISequence<Dafny.Rune> _in59 = (str).Drop(BigInteger.One);
+        Dafny.ISet<Dafny.Rune> _in60 = mustEscape;
+        Dafny.Rune _in61 = escape;
+        str = _in59;
+        mustEscape = _in60;
+        escape = _in61;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> Unescape(Dafny.ISequence<Dafny.Rune> str, Dafny.Rune escape)
+    {
+      if ((str).Equals(Dafny.Sequence<Dafny.Rune>.FromElements())) {
+        return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_Some(str);
+      } else if (((str).Select(BigInteger.Zero)) == (escape)) {
+        if ((new BigInteger((str).Count)) > (BigInteger.One)) {
+          Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _192_valueOrError0 = Std.Strings.CharStrEscaping.__default.Unescape((str).Drop(new BigInteger(2)), escape);
+          if ((_192_valueOrError0).IsFailure()) {
+            return (_192_valueOrError0).PropagateFailure<Dafny.ISequence<Dafny.Rune>>();
+          } else {
+            Dafny.ISequence<Dafny.Rune> _193_tl = (_192_valueOrError0).Extract();
+            return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_Some(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.FromElements((str).Select(BigInteger.One)), _193_tl));
+          }
+        } else {
+          return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_None();
+        }
+      } else {
+        Std.Wrappers._IOption<Dafny.ISequence<Dafny.Rune>> _194_valueOrError1 = Std.Strings.CharStrEscaping.__default.Unescape((str).Drop(BigInteger.One), escape);
+        if ((_194_valueOrError1).IsFailure()) {
+          return (_194_valueOrError1).PropagateFailure<Dafny.ISequence<Dafny.Rune>>();
+        } else {
+          Dafny.ISequence<Dafny.Rune> _195_tl = (_194_valueOrError1).Extract();
+          return Std.Wrappers.Option<Dafny.ISequence<Dafny.Rune>>.create_Some(Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.FromElements((str).Select(BigInteger.Zero)), _195_tl));
+        }
+      }
+    }
+  }
+} // end of namespace Std.Strings.CharStrEscaping
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/Std_Strings_DecimalConversion.cs b/Source/DafnyCore/GeneratedFromDafny/Std_Strings_DecimalConversion.cs
new file mode 100644
index 00000000000..b4cb16c5f73
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/Std_Strings_DecimalConversion.cs
@@ -0,0 +1,195 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace Std.Strings.DecimalConversion {
+
+  public partial class __default {
+    public static BigInteger BASE() {
+      return Std.Strings.DecimalConversion.__default.@base;
+    }
+    public static bool IsDigitChar(Dafny.Rune c) {
+      return (Std.Strings.DecimalConversion.__default.charToDigit).Contains(c);
+    }
+    public static Dafny.ISequence<Dafny.Rune> OfDigits(Dafny.ISequence<BigInteger> digits) {
+      Dafny.ISequence<Dafny.Rune> _172___accumulator = Dafny.Sequence<Dafny.Rune>.FromElements();
+    TAIL_CALL_START: ;
+      if ((digits).Equals(Dafny.Sequence<BigInteger>.FromElements())) {
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.FromElements(), _172___accumulator);
+      } else {
+        _172___accumulator = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.FromElements((Std.Strings.DecimalConversion.__default.chars).Select((digits).Select(BigInteger.Zero))), _172___accumulator);
+        Dafny.ISequence<BigInteger> _in51 = (digits).Drop(BigInteger.One);
+        digits = _in51;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static Dafny.ISequence<Dafny.Rune> OfNat(BigInteger n) {
+      if ((n).Sign == 0) {
+        return Dafny.Sequence<Dafny.Rune>.FromElements((Std.Strings.DecimalConversion.__default.chars).Select(BigInteger.Zero));
+      } else {
+        return Std.Strings.DecimalConversion.__default.OfDigits(Std.Strings.DecimalConversion.__default.FromNat(n));
+      }
+    }
+    public static bool IsNumberStr(Dafny.ISequence<Dafny.Rune> str, Dafny.Rune minus)
+    {
+      return !(!(str).Equals(Dafny.Sequence<Dafny.Rune>.FromElements())) || (((((str).Select(BigInteger.Zero)) == (minus)) || ((Std.Strings.DecimalConversion.__default.charToDigit).Contains((str).Select(BigInteger.Zero)))) && (Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, bool>>((_173_str) => Dafny.Helpers.Quantifier<Dafny.Rune>(((_173_str).Drop(BigInteger.One)).UniqueElements, true, (((_forall_var_2) => {
+        Dafny.Rune _174_c = (Dafny.Rune)_forall_var_2;
+        return !(((_173_str).Drop(BigInteger.One)).Contains(_174_c)) || (Std.Strings.DecimalConversion.__default.IsDigitChar(_174_c));
+      }))))(str)));
+    }
+    public static Dafny.ISequence<Dafny.Rune> OfInt(BigInteger n, Dafny.Rune minus)
+    {
+      if ((n).Sign != -1) {
+        return Std.Strings.DecimalConversion.__default.OfNat(n);
+      } else {
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.FromElements(minus), Std.Strings.DecimalConversion.__default.OfNat((BigInteger.Zero) - (n)));
+      }
+    }
+    public static BigInteger ToNat(Dafny.ISequence<Dafny.Rune> str) {
+      if ((str).Equals(Dafny.Sequence<Dafny.Rune>.FromElements())) {
+        return BigInteger.Zero;
+      } else {
+        Dafny.Rune _175_c = (str).Select((new BigInteger((str).Count)) - (BigInteger.One));
+        return ((Std.Strings.DecimalConversion.__default.ToNat((str).Take((new BigInteger((str).Count)) - (BigInteger.One)))) * (Std.Strings.DecimalConversion.__default.@base)) + (Dafny.Map<Dafny.Rune, BigInteger>.Select(Std.Strings.DecimalConversion.__default.charToDigit,_175_c));
+      }
+    }
+    public static BigInteger ToInt(Dafny.ISequence<Dafny.Rune> str, Dafny.Rune minus)
+    {
+      if (Dafny.Sequence<Dafny.Rune>.IsPrefixOf(Dafny.Sequence<Dafny.Rune>.FromElements(minus), str)) {
+        return (BigInteger.Zero) - (Std.Strings.DecimalConversion.__default.ToNat((str).Drop(BigInteger.One)));
+      } else {
+        return Std.Strings.DecimalConversion.__default.ToNat(str);
+      }
+    }
+    public static BigInteger ToNatRight(Dafny.ISequence<BigInteger> xs) {
+      if ((new BigInteger((xs).Count)).Sign == 0) {
+        return BigInteger.Zero;
+      } else {
+        return ((Std.Strings.DecimalConversion.__default.ToNatRight(Std.Collections.Seq.__default.DropFirst<BigInteger>(xs))) * (Std.Strings.DecimalConversion.__default.BASE())) + (Std.Collections.Seq.__default.First<BigInteger>(xs));
+      }
+    }
+    public static BigInteger ToNatLeft(Dafny.ISequence<BigInteger> xs) {
+      BigInteger _176___accumulator = BigInteger.Zero;
+    TAIL_CALL_START: ;
+      if ((new BigInteger((xs).Count)).Sign == 0) {
+        return (BigInteger.Zero) + (_176___accumulator);
+      } else {
+        _176___accumulator = ((Std.Collections.Seq.__default.Last<BigInteger>(xs)) * (Std.Arithmetic.Power.__default.Pow(Std.Strings.DecimalConversion.__default.BASE(), (new BigInteger((xs).Count)) - (BigInteger.One)))) + (_176___accumulator);
+        Dafny.ISequence<BigInteger> _in52 = Std.Collections.Seq.__default.DropLast<BigInteger>(xs);
+        xs = _in52;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static Dafny.ISequence<BigInteger> FromNat(BigInteger n) {
+      Dafny.ISequence<BigInteger> _177___accumulator = Dafny.Sequence<BigInteger>.FromElements();
+    TAIL_CALL_START: ;
+      if ((n).Sign == 0) {
+        return Dafny.Sequence<BigInteger>.Concat(_177___accumulator, Dafny.Sequence<BigInteger>.FromElements());
+      } else {
+        _177___accumulator = Dafny.Sequence<BigInteger>.Concat(_177___accumulator, Dafny.Sequence<BigInteger>.FromElements(Dafny.Helpers.EuclideanModulus(n, Std.Strings.DecimalConversion.__default.BASE())));
+        BigInteger _in53 = Dafny.Helpers.EuclideanDivision(n, Std.Strings.DecimalConversion.__default.BASE());
+        n = _in53;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static Dafny.ISequence<BigInteger> SeqExtend(Dafny.ISequence<BigInteger> xs, BigInteger n)
+    {
+    TAIL_CALL_START: ;
+      if ((new BigInteger((xs).Count)) >= (n)) {
+        return xs;
+      } else {
+        Dafny.ISequence<BigInteger> _in54 = Dafny.Sequence<BigInteger>.Concat(xs, Dafny.Sequence<BigInteger>.FromElements(BigInteger.Zero));
+        BigInteger _in55 = n;
+        xs = _in54;
+        n = _in55;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static Dafny.ISequence<BigInteger> SeqExtendMultiple(Dafny.ISequence<BigInteger> xs, BigInteger n)
+    {
+      BigInteger _178_newLen = ((new BigInteger((xs).Count)) + (n)) - (Dafny.Helpers.EuclideanModulus(new BigInteger((xs).Count), n));
+      return Std.Strings.DecimalConversion.__default.SeqExtend(xs, _178_newLen);
+    }
+    public static Dafny.ISequence<BigInteger> FromNatWithLen(BigInteger n, BigInteger len)
+    {
+      return Std.Strings.DecimalConversion.__default.SeqExtend(Std.Strings.DecimalConversion.__default.FromNat(n), len);
+    }
+    public static Dafny.ISequence<BigInteger> SeqZero(BigInteger len) {
+      Dafny.ISequence<BigInteger> _179_xs = Std.Strings.DecimalConversion.__default.FromNatWithLen(BigInteger.Zero, len);
+      return _179_xs;
+    }
+    public static _System._ITuple2<Dafny.ISequence<BigInteger>, BigInteger> SeqAdd(Dafny.ISequence<BigInteger> xs, Dafny.ISequence<BigInteger> ys)
+    {
+      if ((new BigInteger((xs).Count)).Sign == 0) {
+        return _System.Tuple2<Dafny.ISequence<BigInteger>, BigInteger>.create(Dafny.Sequence<BigInteger>.FromElements(), BigInteger.Zero);
+      } else {
+        _System._ITuple2<Dafny.ISequence<BigInteger>, BigInteger> _let_tmp_rhs5 = Std.Strings.DecimalConversion.__default.SeqAdd(Std.Collections.Seq.__default.DropLast<BigInteger>(xs), Std.Collections.Seq.__default.DropLast<BigInteger>(ys));
+        Dafny.ISequence<BigInteger> _180_zs_k = _let_tmp_rhs5.dtor__0;
+        BigInteger _181_cin = _let_tmp_rhs5.dtor__1;
+        BigInteger _182_sum = ((Std.Collections.Seq.__default.Last<BigInteger>(xs)) + (Std.Collections.Seq.__default.Last<BigInteger>(ys))) + (_181_cin);
+        _System._ITuple2<BigInteger, BigInteger> _let_tmp_rhs6 = (((_182_sum) < (Std.Strings.DecimalConversion.__default.BASE())) ? (_System.Tuple2<BigInteger, BigInteger>.create(_182_sum, BigInteger.Zero)) : (_System.Tuple2<BigInteger, BigInteger>.create((_182_sum) - (Std.Strings.DecimalConversion.__default.BASE()), BigInteger.One)));
+        BigInteger _183_sum__out = _let_tmp_rhs6.dtor__0;
+        BigInteger _184_cout = _let_tmp_rhs6.dtor__1;
+        return _System.Tuple2<Dafny.ISequence<BigInteger>, BigInteger>.create(Dafny.Sequence<BigInteger>.Concat(_180_zs_k, Dafny.Sequence<BigInteger>.FromElements(_183_sum__out)), _184_cout);
+      }
+    }
+    public static _System._ITuple2<Dafny.ISequence<BigInteger>, BigInteger> SeqSub(Dafny.ISequence<BigInteger> xs, Dafny.ISequence<BigInteger> ys)
+    {
+      if ((new BigInteger((xs).Count)).Sign == 0) {
+        return _System.Tuple2<Dafny.ISequence<BigInteger>, BigInteger>.create(Dafny.Sequence<BigInteger>.FromElements(), BigInteger.Zero);
+      } else {
+        _System._ITuple2<Dafny.ISequence<BigInteger>, BigInteger> _let_tmp_rhs7 = Std.Strings.DecimalConversion.__default.SeqSub(Std.Collections.Seq.__default.DropLast<BigInteger>(xs), Std.Collections.Seq.__default.DropLast<BigInteger>(ys));
+        Dafny.ISequence<BigInteger> _185_zs = _let_tmp_rhs7.dtor__0;
+        BigInteger _186_cin = _let_tmp_rhs7.dtor__1;
+        _System._ITuple2<BigInteger, BigInteger> _let_tmp_rhs8 = (((Std.Collections.Seq.__default.Last<BigInteger>(xs)) >= ((Std.Collections.Seq.__default.Last<BigInteger>(ys)) + (_186_cin))) ? (_System.Tuple2<BigInteger, BigInteger>.create(((Std.Collections.Seq.__default.Last<BigInteger>(xs)) - (Std.Collections.Seq.__default.Last<BigInteger>(ys))) - (_186_cin), BigInteger.Zero)) : (_System.Tuple2<BigInteger, BigInteger>.create((((Std.Strings.DecimalConversion.__default.BASE()) + (Std.Collections.Seq.__default.Last<BigInteger>(xs))) - (Std.Collections.Seq.__default.Last<BigInteger>(ys))) - (_186_cin), BigInteger.One)));
+        BigInteger _187_diff__out = _let_tmp_rhs8.dtor__0;
+        BigInteger _188_cout = _let_tmp_rhs8.dtor__1;
+        return _System.Tuple2<Dafny.ISequence<BigInteger>, BigInteger>.create(Dafny.Sequence<BigInteger>.Concat(_185_zs, Dafny.Sequence<BigInteger>.FromElements(_187_diff__out)), _188_cout);
+      }
+    }
+    public static Dafny.ISequence<Dafny.Rune> DIGITS { get {
+      return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("0123456789");
+    } }
+    public static Dafny.ISequence<Dafny.Rune> chars { get {
+      return Std.Strings.DecimalConversion.__default.DIGITS;
+    } }
+    public static BigInteger @base { get {
+      return new BigInteger((Std.Strings.DecimalConversion.__default.chars).Count);
+    } }
+    public static Dafny.IMap<Dafny.Rune,BigInteger> charToDigit { get {
+      return Dafny.Map<Dafny.Rune, BigInteger>.FromElements(new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('0'), BigInteger.Zero), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('1'), BigInteger.One), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('2'), new BigInteger(2)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('3'), new BigInteger(3)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('4'), new BigInteger(4)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('5'), new BigInteger(5)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('6'), new BigInteger(6)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('7'), new BigInteger(7)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('8'), new BigInteger(8)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('9'), new BigInteger(9)));
+    } }
+  }
+
+  public partial class CharSeq {
+    private static readonly Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>> _TYPE = new Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>>(Dafny.Sequence<Dafny.Rune>.Empty);
+    public static Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static bool _Is(Dafny.ISequence<Dafny.Rune> __source) {
+      Dafny.ISequence<Dafny.Rune> _189_chars = __source;
+      return (new BigInteger((_189_chars).Count)) > (BigInteger.One);
+    }
+  }
+
+  public partial class digit {
+    private static readonly Dafny.TypeDescriptor<BigInteger> _TYPE = new Dafny.TypeDescriptor<BigInteger>(BigInteger.Zero);
+    public static Dafny.TypeDescriptor<BigInteger> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static bool _Is(BigInteger __source) {
+      BigInteger _190_i = __source;
+      if (_System.nat._Is(_190_i)) {
+        return ((_190_i).Sign != -1) && ((_190_i) < (Std.Strings.DecimalConversion.__default.BASE()));
+      }
+      return false;
+    }
+  }
+} // end of namespace Std.Strings.DecimalConversion
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/Std_Strings_HexConversion.cs b/Source/DafnyCore/GeneratedFromDafny/Std_Strings_HexConversion.cs
new file mode 100644
index 00000000000..50e9c4c8e41
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/Std_Strings_HexConversion.cs
@@ -0,0 +1,195 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace Std.Strings.HexConversion {
+
+  public partial class __default {
+    public static BigInteger BASE() {
+      return Std.Strings.HexConversion.__default.@base;
+    }
+    public static bool IsDigitChar(Dafny.Rune c) {
+      return (Std.Strings.HexConversion.__default.charToDigit).Contains(c);
+    }
+    public static Dafny.ISequence<Dafny.Rune> OfDigits(Dafny.ISequence<BigInteger> digits) {
+      Dafny.ISequence<Dafny.Rune> _153___accumulator = Dafny.Sequence<Dafny.Rune>.FromElements();
+    TAIL_CALL_START: ;
+      if ((digits).Equals(Dafny.Sequence<BigInteger>.FromElements())) {
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.FromElements(), _153___accumulator);
+      } else {
+        _153___accumulator = Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.FromElements((Std.Strings.HexConversion.__default.chars).Select((digits).Select(BigInteger.Zero))), _153___accumulator);
+        Dafny.ISequence<BigInteger> _in46 = (digits).Drop(BigInteger.One);
+        digits = _in46;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static Dafny.ISequence<Dafny.Rune> OfNat(BigInteger n) {
+      if ((n).Sign == 0) {
+        return Dafny.Sequence<Dafny.Rune>.FromElements((Std.Strings.HexConversion.__default.chars).Select(BigInteger.Zero));
+      } else {
+        return Std.Strings.HexConversion.__default.OfDigits(Std.Strings.HexConversion.__default.FromNat(n));
+      }
+    }
+    public static bool IsNumberStr(Dafny.ISequence<Dafny.Rune> str, Dafny.Rune minus)
+    {
+      return !(!(str).Equals(Dafny.Sequence<Dafny.Rune>.FromElements())) || (((((str).Select(BigInteger.Zero)) == (minus)) || ((Std.Strings.HexConversion.__default.charToDigit).Contains((str).Select(BigInteger.Zero)))) && (Dafny.Helpers.Id<Func<Dafny.ISequence<Dafny.Rune>, bool>>((_154_str) => Dafny.Helpers.Quantifier<Dafny.Rune>(((_154_str).Drop(BigInteger.One)).UniqueElements, true, (((_forall_var_1) => {
+        Dafny.Rune _155_c = (Dafny.Rune)_forall_var_1;
+        return !(((_154_str).Drop(BigInteger.One)).Contains(_155_c)) || (Std.Strings.HexConversion.__default.IsDigitChar(_155_c));
+      }))))(str)));
+    }
+    public static Dafny.ISequence<Dafny.Rune> OfInt(BigInteger n, Dafny.Rune minus)
+    {
+      if ((n).Sign != -1) {
+        return Std.Strings.HexConversion.__default.OfNat(n);
+      } else {
+        return Dafny.Sequence<Dafny.Rune>.Concat(Dafny.Sequence<Dafny.Rune>.FromElements(minus), Std.Strings.HexConversion.__default.OfNat((BigInteger.Zero) - (n)));
+      }
+    }
+    public static BigInteger ToNat(Dafny.ISequence<Dafny.Rune> str) {
+      if ((str).Equals(Dafny.Sequence<Dafny.Rune>.FromElements())) {
+        return BigInteger.Zero;
+      } else {
+        Dafny.Rune _156_c = (str).Select((new BigInteger((str).Count)) - (BigInteger.One));
+        return ((Std.Strings.HexConversion.__default.ToNat((str).Take((new BigInteger((str).Count)) - (BigInteger.One)))) * (Std.Strings.HexConversion.__default.@base)) + (Dafny.Map<Dafny.Rune, BigInteger>.Select(Std.Strings.HexConversion.__default.charToDigit,_156_c));
+      }
+    }
+    public static BigInteger ToInt(Dafny.ISequence<Dafny.Rune> str, Dafny.Rune minus)
+    {
+      if (Dafny.Sequence<Dafny.Rune>.IsPrefixOf(Dafny.Sequence<Dafny.Rune>.FromElements(minus), str)) {
+        return (BigInteger.Zero) - (Std.Strings.HexConversion.__default.ToNat((str).Drop(BigInteger.One)));
+      } else {
+        return Std.Strings.HexConversion.__default.ToNat(str);
+      }
+    }
+    public static BigInteger ToNatRight(Dafny.ISequence<BigInteger> xs) {
+      if ((new BigInteger((xs).Count)).Sign == 0) {
+        return BigInteger.Zero;
+      } else {
+        return ((Std.Strings.HexConversion.__default.ToNatRight(Std.Collections.Seq.__default.DropFirst<BigInteger>(xs))) * (Std.Strings.HexConversion.__default.BASE())) + (Std.Collections.Seq.__default.First<BigInteger>(xs));
+      }
+    }
+    public static BigInteger ToNatLeft(Dafny.ISequence<BigInteger> xs) {
+      BigInteger _157___accumulator = BigInteger.Zero;
+    TAIL_CALL_START: ;
+      if ((new BigInteger((xs).Count)).Sign == 0) {
+        return (BigInteger.Zero) + (_157___accumulator);
+      } else {
+        _157___accumulator = ((Std.Collections.Seq.__default.Last<BigInteger>(xs)) * (Std.Arithmetic.Power.__default.Pow(Std.Strings.HexConversion.__default.BASE(), (new BigInteger((xs).Count)) - (BigInteger.One)))) + (_157___accumulator);
+        Dafny.ISequence<BigInteger> _in47 = Std.Collections.Seq.__default.DropLast<BigInteger>(xs);
+        xs = _in47;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static Dafny.ISequence<BigInteger> FromNat(BigInteger n) {
+      Dafny.ISequence<BigInteger> _158___accumulator = Dafny.Sequence<BigInteger>.FromElements();
+    TAIL_CALL_START: ;
+      if ((n).Sign == 0) {
+        return Dafny.Sequence<BigInteger>.Concat(_158___accumulator, Dafny.Sequence<BigInteger>.FromElements());
+      } else {
+        _158___accumulator = Dafny.Sequence<BigInteger>.Concat(_158___accumulator, Dafny.Sequence<BigInteger>.FromElements(Dafny.Helpers.EuclideanModulus(n, Std.Strings.HexConversion.__default.BASE())));
+        BigInteger _in48 = Dafny.Helpers.EuclideanDivision(n, Std.Strings.HexConversion.__default.BASE());
+        n = _in48;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static Dafny.ISequence<BigInteger> SeqExtend(Dafny.ISequence<BigInteger> xs, BigInteger n)
+    {
+    TAIL_CALL_START: ;
+      if ((new BigInteger((xs).Count)) >= (n)) {
+        return xs;
+      } else {
+        Dafny.ISequence<BigInteger> _in49 = Dafny.Sequence<BigInteger>.Concat(xs, Dafny.Sequence<BigInteger>.FromElements(BigInteger.Zero));
+        BigInteger _in50 = n;
+        xs = _in49;
+        n = _in50;
+        goto TAIL_CALL_START;
+      }
+    }
+    public static Dafny.ISequence<BigInteger> SeqExtendMultiple(Dafny.ISequence<BigInteger> xs, BigInteger n)
+    {
+      BigInteger _159_newLen = ((new BigInteger((xs).Count)) + (n)) - (Dafny.Helpers.EuclideanModulus(new BigInteger((xs).Count), n));
+      return Std.Strings.HexConversion.__default.SeqExtend(xs, _159_newLen);
+    }
+    public static Dafny.ISequence<BigInteger> FromNatWithLen(BigInteger n, BigInteger len)
+    {
+      return Std.Strings.HexConversion.__default.SeqExtend(Std.Strings.HexConversion.__default.FromNat(n), len);
+    }
+    public static Dafny.ISequence<BigInteger> SeqZero(BigInteger len) {
+      Dafny.ISequence<BigInteger> _160_xs = Std.Strings.HexConversion.__default.FromNatWithLen(BigInteger.Zero, len);
+      return _160_xs;
+    }
+    public static _System._ITuple2<Dafny.ISequence<BigInteger>, BigInteger> SeqAdd(Dafny.ISequence<BigInteger> xs, Dafny.ISequence<BigInteger> ys)
+    {
+      if ((new BigInteger((xs).Count)).Sign == 0) {
+        return _System.Tuple2<Dafny.ISequence<BigInteger>, BigInteger>.create(Dafny.Sequence<BigInteger>.FromElements(), BigInteger.Zero);
+      } else {
+        _System._ITuple2<Dafny.ISequence<BigInteger>, BigInteger> _let_tmp_rhs1 = Std.Strings.HexConversion.__default.SeqAdd(Std.Collections.Seq.__default.DropLast<BigInteger>(xs), Std.Collections.Seq.__default.DropLast<BigInteger>(ys));
+        Dafny.ISequence<BigInteger> _161_zs_k = _let_tmp_rhs1.dtor__0;
+        BigInteger _162_cin = _let_tmp_rhs1.dtor__1;
+        BigInteger _163_sum = ((Std.Collections.Seq.__default.Last<BigInteger>(xs)) + (Std.Collections.Seq.__default.Last<BigInteger>(ys))) + (_162_cin);
+        _System._ITuple2<BigInteger, BigInteger> _let_tmp_rhs2 = (((_163_sum) < (Std.Strings.HexConversion.__default.BASE())) ? (_System.Tuple2<BigInteger, BigInteger>.create(_163_sum, BigInteger.Zero)) : (_System.Tuple2<BigInteger, BigInteger>.create((_163_sum) - (Std.Strings.HexConversion.__default.BASE()), BigInteger.One)));
+        BigInteger _164_sum__out = _let_tmp_rhs2.dtor__0;
+        BigInteger _165_cout = _let_tmp_rhs2.dtor__1;
+        return _System.Tuple2<Dafny.ISequence<BigInteger>, BigInteger>.create(Dafny.Sequence<BigInteger>.Concat(_161_zs_k, Dafny.Sequence<BigInteger>.FromElements(_164_sum__out)), _165_cout);
+      }
+    }
+    public static _System._ITuple2<Dafny.ISequence<BigInteger>, BigInteger> SeqSub(Dafny.ISequence<BigInteger> xs, Dafny.ISequence<BigInteger> ys)
+    {
+      if ((new BigInteger((xs).Count)).Sign == 0) {
+        return _System.Tuple2<Dafny.ISequence<BigInteger>, BigInteger>.create(Dafny.Sequence<BigInteger>.FromElements(), BigInteger.Zero);
+      } else {
+        _System._ITuple2<Dafny.ISequence<BigInteger>, BigInteger> _let_tmp_rhs3 = Std.Strings.HexConversion.__default.SeqSub(Std.Collections.Seq.__default.DropLast<BigInteger>(xs), Std.Collections.Seq.__default.DropLast<BigInteger>(ys));
+        Dafny.ISequence<BigInteger> _166_zs = _let_tmp_rhs3.dtor__0;
+        BigInteger _167_cin = _let_tmp_rhs3.dtor__1;
+        _System._ITuple2<BigInteger, BigInteger> _let_tmp_rhs4 = (((Std.Collections.Seq.__default.Last<BigInteger>(xs)) >= ((Std.Collections.Seq.__default.Last<BigInteger>(ys)) + (_167_cin))) ? (_System.Tuple2<BigInteger, BigInteger>.create(((Std.Collections.Seq.__default.Last<BigInteger>(xs)) - (Std.Collections.Seq.__default.Last<BigInteger>(ys))) - (_167_cin), BigInteger.Zero)) : (_System.Tuple2<BigInteger, BigInteger>.create((((Std.Strings.HexConversion.__default.BASE()) + (Std.Collections.Seq.__default.Last<BigInteger>(xs))) - (Std.Collections.Seq.__default.Last<BigInteger>(ys))) - (_167_cin), BigInteger.One)));
+        BigInteger _168_diff__out = _let_tmp_rhs4.dtor__0;
+        BigInteger _169_cout = _let_tmp_rhs4.dtor__1;
+        return _System.Tuple2<Dafny.ISequence<BigInteger>, BigInteger>.create(Dafny.Sequence<BigInteger>.Concat(_166_zs, Dafny.Sequence<BigInteger>.FromElements(_168_diff__out)), _169_cout);
+      }
+    }
+    public static Dafny.ISequence<Dafny.Rune> HEX__DIGITS { get {
+      return Dafny.Sequence<Dafny.Rune>.UnicodeFromString("0123456789ABCDEF");
+    } }
+    public static Dafny.ISequence<Dafny.Rune> chars { get {
+      return Std.Strings.HexConversion.__default.HEX__DIGITS;
+    } }
+    public static BigInteger @base { get {
+      return new BigInteger((Std.Strings.HexConversion.__default.chars).Count);
+    } }
+    public static Dafny.IMap<Dafny.Rune,BigInteger> charToDigit { get {
+      return Dafny.Map<Dafny.Rune, BigInteger>.FromElements(new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('0'), BigInteger.Zero), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('1'), BigInteger.One), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('2'), new BigInteger(2)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('3'), new BigInteger(3)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('4'), new BigInteger(4)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('5'), new BigInteger(5)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('6'), new BigInteger(6)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('7'), new BigInteger(7)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('8'), new BigInteger(8)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('9'), new BigInteger(9)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('a'), new BigInteger(10)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('b'), new BigInteger(11)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('c'), new BigInteger(12)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('d'), new BigInteger(13)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('e'), new BigInteger(14)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('f'), new BigInteger(15)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('A'), new BigInteger(10)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('B'), new BigInteger(11)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('C'), new BigInteger(12)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('D'), new BigInteger(13)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('E'), new BigInteger(14)), new Dafny.Pair<Dafny.Rune, BigInteger>(new Dafny.Rune('F'), new BigInteger(15)));
+    } }
+  }
+
+  public partial class CharSeq {
+    private static readonly Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>> _TYPE = new Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>>(Dafny.Sequence<Dafny.Rune>.Empty);
+    public static Dafny.TypeDescriptor<Dafny.ISequence<Dafny.Rune>> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static bool _Is(Dafny.ISequence<Dafny.Rune> __source) {
+      Dafny.ISequence<Dafny.Rune> _170_chars = __source;
+      return (new BigInteger((_170_chars).Count)) > (BigInteger.One);
+    }
+  }
+
+  public partial class digit {
+    private static readonly Dafny.TypeDescriptor<BigInteger> _TYPE = new Dafny.TypeDescriptor<BigInteger>(BigInteger.Zero);
+    public static Dafny.TypeDescriptor<BigInteger> _TypeDescriptor() {
+      return _TYPE;
+    }
+    public static bool _Is(BigInteger __source) {
+      BigInteger _171_i = __source;
+      if (_System.nat._Is(_171_i)) {
+        return ((_171_i).Sign != -1) && ((_171_i) < (Std.Strings.HexConversion.__default.BASE()));
+      }
+      return false;
+    }
+  }
+} // end of namespace Std.Strings.HexConversion
\ No newline at end of file
diff --git a/Source/DafnyCore/GeneratedFromDafny/Std_Wrappers.cs b/Source/DafnyCore/GeneratedFromDafny/Std_Wrappers.cs
new file mode 100644
index 00000000000..ec0a8068845
--- /dev/null
+++ b/Source/DafnyCore/GeneratedFromDafny/Std_Wrappers.cs
@@ -0,0 +1,529 @@
+// Dafny program the_program compiled into C#
+// To recompile, you will need the libraries
+//     System.Runtime.Numerics.dll System.Collections.Immutable.dll
+// but the 'dotnet' tool in net6.0 should pick those up automatically.
+// Optionally, you may want to include compiler switches like
+//     /debug /nowarn:162,164,168,183,219,436,1717,1718
+
+using System;
+using System.Numerics;
+using System.Collections;
+
+namespace Std.Wrappers {
+
+  public partial class __default {
+    public static Std.Wrappers._IOutcomeResult<__E> Need<__E>(bool condition, __E error)
+    {
+      if (condition) {
+        return Std.Wrappers.OutcomeResult<__E>.create_Pass_k();
+      } else {
+        return Std.Wrappers.OutcomeResult<__E>.create_Fail_k(error);
+      }
+    }
+  }
+
+  public interface _IOption<out T> {
+    bool is_None { get; }
+    bool is_Some { get; }
+    T dtor_value { get; }
+    _IOption<__T> DowncastClone<__T>(Func<T, __T> converter0);
+    bool IsFailure();
+    Std.Wrappers._IOption<__U> PropagateFailure<__U>();
+    T Extract();
+    Std.Wrappers._IResult<T, __E> ToResult<__E>(__E error);
+    Std.Wrappers._IOutcome<__E> ToOutcome<__E>(__E error);
+  }
+  public abstract class Option<T> : _IOption<T> {
+    public Option() {
+    }
+    public static Std.Wrappers._IOption<T> Default() {
+      return create_None();
+    }
+    public static Dafny.TypeDescriptor<Std.Wrappers._IOption<T>> _TypeDescriptor() {
+      return new Dafny.TypeDescriptor<Std.Wrappers._IOption<T>>(Std.Wrappers.Option<T>.Default());
+    }
+    public static _IOption<T> create_None() {
+      return new Option_None<T>();
+    }
+    public static _IOption<T> create_Some(T @value) {
+      return new Option_Some<T>(@value);
+    }
+    public bool is_None { get { return this is Option_None<T>; } }
+    public bool is_Some { get { return this is Option_Some<T>; } }
+    public T dtor_value {
+      get {
+        var d = this;
+        return ((Option_Some<T>)d)._value;
+      }
+    }
+    public abstract _IOption<__T> DowncastClone<__T>(Func<T, __T> converter0);
+    public bool IsFailure() {
+      return (this).is_None;
+    }
+    public Std.Wrappers._IOption<__U> PropagateFailure<__U>() {
+      return Std.Wrappers.Option<__U>.create_None();
+    }
+    public T Extract() {
+      return (this).dtor_value;
+    }
+    public static T GetOr(Std.Wrappers._IOption<T> _this, T @default) {
+      Std.Wrappers._IOption<T> _source0 = _this;
+      if (_source0.is_None) {
+        return @default;
+      } else {
+        T __mcc_h0 = _source0.dtor_value;
+        T v = __mcc_h0;
+        return v;
+      }
+    }
+    public Std.Wrappers._IResult<T, __E> ToResult<__E>(__E error) {
+      Std.Wrappers._IOption<T> _source1 = this;
+      if (_source1.is_None) {
+        return Std.Wrappers.Result<T, __E>.create_Failure(error);
+      } else {
+        T __mcc_h0 = _source1.dtor_value;
+        T v = __mcc_h0;
+        return Std.Wrappers.Result<T, __E>.create_Success(v);
+      }
+    }
+    public Std.Wrappers._IOutcome<__E> ToOutcome<__E>(__E error) {
+      Std.Wrappers._IOption<T> _source2 = this;
+      if (_source2.is_None) {
+        return Std.Wrappers.Outcome<__E>.create_Fail(error);
+      } else {
+        T __mcc_h0 = _source2.dtor_value;
+        T v = __mcc_h0;
+        return Std.Wrappers.Outcome<__E>.create_Pass();
+      }
+    }
+    public static __FC Map<__FC>(Std.Wrappers._IOption<T> _this, Func<Std.Wrappers._IOption<T>, __FC> rewrap) {
+      return Dafny.Helpers.Id<Func<Std.Wrappers._IOption<T>, __FC>>(rewrap)(_this);
+    }
+  }
+  public class Option_None<T> : Option<T> {
+    public Option_None() : base() {
+    }
+    public override _IOption<__T> DowncastClone<__T>(Func<T, __T> converter0) {
+      if (this is _IOption<__T> dt) { return dt; }
+      return new Option_None<__T>();
+    }
+    public override bool Equals(object other) {
+      var oth = other as Std.Wrappers.Option_None<T>;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "Wrappers.Option.None";
+      return s;
+    }
+  }
+  public class Option_Some<T> : Option<T> {
+    public readonly T _value;
+    public Option_Some(T @value) : base() {
+      this._value = @value;
+    }
+    public override _IOption<__T> DowncastClone<__T>(Func<T, __T> converter0) {
+      if (this is _IOption<__T> dt) { return dt; }
+      return new Option_Some<__T>(converter0(_value));
+    }
+    public override bool Equals(object other) {
+      var oth = other as Std.Wrappers.Option_Some<T>;
+      return oth != null && object.Equals(this._value, oth._value);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._value));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "Wrappers.Option.Some";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._value);
+      s += ")";
+      return s;
+    }
+  }
+
+  public interface _IResult<out R, out E> {
+    bool is_Success { get; }
+    bool is_Failure { get; }
+    R dtor_value { get; }
+    E dtor_error { get; }
+    _IResult<__R, __E> DowncastClone<__R, __E>(Func<R, __R> converter0, Func<E, __E> converter1);
+    bool IsFailure();
+    Std.Wrappers._IResult<__U, E> PropagateFailure<__U>();
+    R Extract();
+    Std.Wrappers._IOption<R> ToOption();
+    Std.Wrappers._IOutcome<E> ToOutcome();
+  }
+  public abstract class Result<R, E> : _IResult<R, E> {
+    public Result() {
+    }
+    public static Std.Wrappers._IResult<R, E> Default(R _default_R) {
+      return create_Success(_default_R);
+    }
+    public static Dafny.TypeDescriptor<Std.Wrappers._IResult<R, E>> _TypeDescriptor(Dafny.TypeDescriptor<R> _td_R) {
+      return new Dafny.TypeDescriptor<Std.Wrappers._IResult<R, E>>(Std.Wrappers.Result<R, E>.Default(_td_R.Default()));
+    }
+    public static _IResult<R, E> create_Success(R @value) {
+      return new Result_Success<R, E>(@value);
+    }
+    public static _IResult<R, E> create_Failure(E error) {
+      return new Result_Failure<R, E>(error);
+    }
+    public bool is_Success { get { return this is Result_Success<R, E>; } }
+    public bool is_Failure { get { return this is Result_Failure<R, E>; } }
+    public R dtor_value {
+      get {
+        var d = this;
+        return ((Result_Success<R, E>)d)._value;
+      }
+    }
+    public E dtor_error {
+      get {
+        var d = this;
+        return ((Result_Failure<R, E>)d)._error;
+      }
+    }
+    public abstract _IResult<__R, __E> DowncastClone<__R, __E>(Func<R, __R> converter0, Func<E, __E> converter1);
+    public bool IsFailure() {
+      return (this).is_Failure;
+    }
+    public Std.Wrappers._IResult<__U, E> PropagateFailure<__U>() {
+      return Std.Wrappers.Result<__U, E>.create_Failure((this).dtor_error);
+    }
+    public R Extract() {
+      return (this).dtor_value;
+    }
+    public static R GetOr(Std.Wrappers._IResult<R, E> _this, R @default) {
+      Std.Wrappers._IResult<R, E> _source3 = _this;
+      if (_source3.is_Success) {
+        R _10___mcc_h0 = _source3.dtor_value;
+        R _11_s = _10___mcc_h0;
+        return _11_s;
+      } else {
+        E _12___mcc_h1 = _source3.dtor_error;
+        E _13_e = _12___mcc_h1;
+        return @default;
+      }
+    }
+    public Std.Wrappers._IOption<R> ToOption() {
+      Std.Wrappers._IResult<R, E> _source4 = this;
+      if (_source4.is_Success) {
+        R _14___mcc_h0 = _source4.dtor_value;
+        R _15_s = _14___mcc_h0;
+        return Std.Wrappers.Option<R>.create_Some(_15_s);
+      } else {
+        E _16___mcc_h1 = _source4.dtor_error;
+        E _17_e = _16___mcc_h1;
+        return Std.Wrappers.Option<R>.create_None();
+      }
+    }
+    public Std.Wrappers._IOutcome<E> ToOutcome() {
+      Std.Wrappers._IResult<R, E> _source5 = this;
+      if (_source5.is_Success) {
+        R _18___mcc_h0 = _source5.dtor_value;
+        R _19_s = _18___mcc_h0;
+        return Std.Wrappers.Outcome<E>.create_Pass();
+      } else {
+        E _20___mcc_h1 = _source5.dtor_error;
+        E _21_e = _20___mcc_h1;
+        return Std.Wrappers.Outcome<E>.create_Fail(_21_e);
+      }
+    }
+    public static __FC Map<__FC>(Std.Wrappers._IResult<R, E> _this, Func<Std.Wrappers._IResult<R, E>, __FC> rewrap) {
+      return Dafny.Helpers.Id<Func<Std.Wrappers._IResult<R, E>, __FC>>(rewrap)(_this);
+    }
+    public static Std.Wrappers._IResult<R, __NewE> MapFailure<__NewE>(Std.Wrappers._IResult<R, E> _this, Func<E, __NewE> reWrap) {
+      Std.Wrappers._IResult<R, E> _source6 = _this;
+      if (_source6.is_Success) {
+        R _22___mcc_h0 = _source6.dtor_value;
+        R _23_s = _22___mcc_h0;
+        return Std.Wrappers.Result<R, __NewE>.create_Success(_23_s);
+      } else {
+        E _24___mcc_h1 = _source6.dtor_error;
+        E _25_e = _24___mcc_h1;
+        return Std.Wrappers.Result<R, __NewE>.create_Failure(Dafny.Helpers.Id<Func<E, __NewE>>(reWrap)(_25_e));
+      }
+    }
+  }
+  public class Result_Success<R, E> : Result<R, E> {
+    public readonly R _value;
+    public Result_Success(R @value) : base() {
+      this._value = @value;
+    }
+    public override _IResult<__R, __E> DowncastClone<__R, __E>(Func<R, __R> converter0, Func<E, __E> converter1) {
+      if (this is _IResult<__R, __E> dt) { return dt; }
+      return new Result_Success<__R, __E>(converter0(_value));
+    }
+    public override bool Equals(object other) {
+      var oth = other as Std.Wrappers.Result_Success<R, E>;
+      return oth != null && object.Equals(this._value, oth._value);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._value));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "Wrappers.Result.Success";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._value);
+      s += ")";
+      return s;
+    }
+  }
+  public class Result_Failure<R, E> : Result<R, E> {
+    public readonly E _error;
+    public Result_Failure(E error) : base() {
+      this._error = error;
+    }
+    public override _IResult<__R, __E> DowncastClone<__R, __E>(Func<R, __R> converter0, Func<E, __E> converter1) {
+      if (this is _IResult<__R, __E> dt) { return dt; }
+      return new Result_Failure<__R, __E>(converter1(_error));
+    }
+    public override bool Equals(object other) {
+      var oth = other as Std.Wrappers.Result_Failure<R, E>;
+      return oth != null && object.Equals(this._error, oth._error);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._error));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "Wrappers.Result.Failure";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._error);
+      s += ")";
+      return s;
+    }
+  }
+
+  public interface _IOutcome<out E> {
+    bool is_Pass { get; }
+    bool is_Fail { get; }
+    E dtor_error { get; }
+    _IOutcome<__E> DowncastClone<__E>(Func<E, __E> converter0);
+    bool IsFailure();
+    Std.Wrappers._IOutcome<E> PropagateFailure();
+    Std.Wrappers._IOption<__R> ToOption<__R>(__R r);
+    Std.Wrappers._IResult<__R, E> ToResult<__R>(__R r);
+  }
+  public abstract class Outcome<E> : _IOutcome<E> {
+    public Outcome() {
+    }
+    public static Std.Wrappers._IOutcome<E> Default() {
+      return create_Pass();
+    }
+    public static Dafny.TypeDescriptor<Std.Wrappers._IOutcome<E>> _TypeDescriptor() {
+      return new Dafny.TypeDescriptor<Std.Wrappers._IOutcome<E>>(Std.Wrappers.Outcome<E>.Default());
+    }
+    public static _IOutcome<E> create_Pass() {
+      return new Outcome_Pass<E>();
+    }
+    public static _IOutcome<E> create_Fail(E error) {
+      return new Outcome_Fail<E>(error);
+    }
+    public bool is_Pass { get { return this is Outcome_Pass<E>; } }
+    public bool is_Fail { get { return this is Outcome_Fail<E>; } }
+    public E dtor_error {
+      get {
+        var d = this;
+        return ((Outcome_Fail<E>)d)._error;
+      }
+    }
+    public abstract _IOutcome<__E> DowncastClone<__E>(Func<E, __E> converter0);
+    public bool IsFailure() {
+      return (this).is_Fail;
+    }
+    public Std.Wrappers._IOutcome<E> PropagateFailure() {
+      return this;
+    }
+    public Std.Wrappers._IOption<__R> ToOption<__R>(__R r) {
+      Std.Wrappers._IOutcome<E> _source7 = this;
+      if (_source7.is_Pass) {
+        return Std.Wrappers.Option<__R>.create_Some(r);
+      } else {
+        E _26___mcc_h0 = _source7.dtor_error;
+        E _27_e = _26___mcc_h0;
+        return Std.Wrappers.Option<__R>.create_None();
+      }
+    }
+    public Std.Wrappers._IResult<__R, E> ToResult<__R>(__R r) {
+      Std.Wrappers._IOutcome<E> _source8 = this;
+      if (_source8.is_Pass) {
+        return Std.Wrappers.Result<__R, E>.create_Success(r);
+      } else {
+        E _28___mcc_h0 = _source8.dtor_error;
+        E _29_e = _28___mcc_h0;
+        return Std.Wrappers.Result<__R, E>.create_Failure(_29_e);
+      }
+    }
+    public static __FC Map<__FC>(Std.Wrappers._IOutcome<E> _this, Func<Std.Wrappers._IOutcome<E>, __FC> rewrap) {
+      return Dafny.Helpers.Id<Func<Std.Wrappers._IOutcome<E>, __FC>>(rewrap)(_this);
+    }
+    public static Std.Wrappers._IResult<__T, __NewE> MapFailure<__T, __NewE>(Std.Wrappers._IOutcome<E> _this, Func<E, __NewE> rewrap, __T @default)
+    {
+      Std.Wrappers._IOutcome<E> _source9 = _this;
+      if (_source9.is_Pass) {
+        return Std.Wrappers.Result<__T, __NewE>.create_Success(@default);
+      } else {
+        E _30___mcc_h0 = _source9.dtor_error;
+        E _31_e = _30___mcc_h0;
+        return Std.Wrappers.Result<__T, __NewE>.create_Failure(Dafny.Helpers.Id<Func<E, __NewE>>(rewrap)(_31_e));
+      }
+    }
+    public static Std.Wrappers._IOutcome<E> Need(bool condition, E error)
+    {
+      if (condition) {
+        return Std.Wrappers.Outcome<E>.create_Pass();
+      } else {
+        return Std.Wrappers.Outcome<E>.create_Fail(error);
+      }
+    }
+  }
+  public class Outcome_Pass<E> : Outcome<E> {
+    public Outcome_Pass() : base() {
+    }
+    public override _IOutcome<__E> DowncastClone<__E>(Func<E, __E> converter0) {
+      if (this is _IOutcome<__E> dt) { return dt; }
+      return new Outcome_Pass<__E>();
+    }
+    public override bool Equals(object other) {
+      var oth = other as Std.Wrappers.Outcome_Pass<E>;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "Wrappers.Outcome.Pass";
+      return s;
+    }
+  }
+  public class Outcome_Fail<E> : Outcome<E> {
+    public readonly E _error;
+    public Outcome_Fail(E error) : base() {
+      this._error = error;
+    }
+    public override _IOutcome<__E> DowncastClone<__E>(Func<E, __E> converter0) {
+      if (this is _IOutcome<__E> dt) { return dt; }
+      return new Outcome_Fail<__E>(converter0(_error));
+    }
+    public override bool Equals(object other) {
+      var oth = other as Std.Wrappers.Outcome_Fail<E>;
+      return oth != null && object.Equals(this._error, oth._error);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._error));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "Wrappers.Outcome.Fail";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._error);
+      s += ")";
+      return s;
+    }
+  }
+
+  public interface _IOutcomeResult<out E> {
+    bool is_Pass_k { get; }
+    bool is_Fail_k { get; }
+    E dtor_error { get; }
+    _IOutcomeResult<__E> DowncastClone<__E>(Func<E, __E> converter0);
+    bool IsFailure();
+    Std.Wrappers._IResult<__U, E> PropagateFailure<__U>();
+  }
+  public abstract class OutcomeResult<E> : _IOutcomeResult<E> {
+    public OutcomeResult() {
+    }
+    public static Std.Wrappers._IOutcomeResult<E> Default() {
+      return create_Pass_k();
+    }
+    public static Dafny.TypeDescriptor<Std.Wrappers._IOutcomeResult<E>> _TypeDescriptor() {
+      return new Dafny.TypeDescriptor<Std.Wrappers._IOutcomeResult<E>>(Std.Wrappers.OutcomeResult<E>.Default());
+    }
+    public static _IOutcomeResult<E> create_Pass_k() {
+      return new OutcomeResult_Pass_k<E>();
+    }
+    public static _IOutcomeResult<E> create_Fail_k(E error) {
+      return new OutcomeResult_Fail_k<E>(error);
+    }
+    public bool is_Pass_k { get { return this is OutcomeResult_Pass_k<E>; } }
+    public bool is_Fail_k { get { return this is OutcomeResult_Fail_k<E>; } }
+    public E dtor_error {
+      get {
+        var d = this;
+        return ((OutcomeResult_Fail_k<E>)d)._error;
+      }
+    }
+    public abstract _IOutcomeResult<__E> DowncastClone<__E>(Func<E, __E> converter0);
+    public bool IsFailure() {
+      return (this).is_Fail_k;
+    }
+    public Std.Wrappers._IResult<__U, E> PropagateFailure<__U>() {
+      return Std.Wrappers.Result<__U, E>.create_Failure((this).dtor_error);
+    }
+  }
+  public class OutcomeResult_Pass_k<E> : OutcomeResult<E> {
+    public OutcomeResult_Pass_k() : base() {
+    }
+    public override _IOutcomeResult<__E> DowncastClone<__E>(Func<E, __E> converter0) {
+      if (this is _IOutcomeResult<__E> dt) { return dt; }
+      return new OutcomeResult_Pass_k<__E>();
+    }
+    public override bool Equals(object other) {
+      var oth = other as Std.Wrappers.OutcomeResult_Pass_k<E>;
+      return oth != null;
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 0;
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "Wrappers.OutcomeResult.Pass'";
+      return s;
+    }
+  }
+  public class OutcomeResult_Fail_k<E> : OutcomeResult<E> {
+    public readonly E _error;
+    public OutcomeResult_Fail_k(E error) : base() {
+      this._error = error;
+    }
+    public override _IOutcomeResult<__E> DowncastClone<__E>(Func<E, __E> converter0) {
+      if (this is _IOutcomeResult<__E> dt) { return dt; }
+      return new OutcomeResult_Fail_k<__E>(converter0(_error));
+    }
+    public override bool Equals(object other) {
+      var oth = other as Std.Wrappers.OutcomeResult_Fail_k<E>;
+      return oth != null && object.Equals(this._error, oth._error);
+    }
+    public override int GetHashCode() {
+      ulong hash = 5381;
+      hash = ((hash << 5) + hash) + 1;
+      hash = ((hash << 5) + hash) + ((ulong)Dafny.Helpers.GetHashCode(this._error));
+      return (int) hash;
+    }
+    public override string ToString() {
+      string s = "Wrappers.OutcomeResult.Fail'";
+      s += "(";
+      s += Dafny.Helpers.ToString(this._error);
+      s += ")";
+      return s;
+    }
+  }
+} // end of namespace Std.Wrappers
\ No newline at end of file
diff --git a/Source/DafnyCore/Makefile b/Source/DafnyCore/Makefile
index 3efb0477a11..e05f6554ae2 100644
--- a/Source/DafnyCore/Makefile
+++ b/Source/DafnyCore/Makefile
@@ -17,7 +17,13 @@ build-regenerated-from-dafny:
 	./DafnyGeneratedFromDafny.sh $(REGENERATED_FROM_DAFNY)
 
 test: build-regenerated-from-dafny
-	(diff $(GENERATED_FROM_DAFNY).cs $(REGENERATED_FROM_DAFNY).cs && (echo 'Consider running ./DafnyGeneratedFromDafny.sh GeneratedFromDafny'))
+	(diff $(GENERATED_FROM_DAFNY) $(REGENERATED_FROM_DAFNY) || (echo 'Consider running ./DafnyGeneratedFromDafny.sh'; exit 1; ))
+	(diff ../DafnyCore.Test/$(GENERATED_FROM_DAFNY) ../DafnyCore.Test/$(REGENERATED_FROM_DAFNY) || (echo 'Consider running ./DafnyGeneratedFromDafny.sh'; exit 1; ))
+	rm -rf $(REGENERATED_FROM_DAFNY)
+	rm -rf ../DafnyCore.Test/$(REGENERATED_FROM_DAFNY)
+
+format:
+	../../Scripts/dafny format .
 
 check-format:
 	../../Scripts/dafny format . --check
diff --git a/Source/DafnyCore/Options/CommonOptionBag.cs b/Source/DafnyCore/Options/CommonOptionBag.cs
index 63d72c43d89..5b0f1cf083a 100644
--- a/Source/DafnyCore/Options/CommonOptionBag.cs
+++ b/Source/DafnyCore/Options/CommonOptionBag.cs
@@ -249,6 +249,11 @@ public enum GeneralTraitsOptions {
   public static readonly Option<bool> UseBaseFileName = new("--use-basename-for-filename",
     "When parsing use basename of file for tokens instead of the path supplied on the command line") {
   };
+  public static readonly Option<bool> EmitUncompilableCode = new("--emit-uncompilable-code",
+    "Rather than throwing an exception, allow compilers to emit uncompilable information including what is " +
+    "not compilable instead of regular code. Useful when developing compilers or to document for each test what " +
+    "compiler feature is missing") {
+  };
   public static readonly Option<bool> SpillTranslation = new("--spill-translation",
     @"In case the Dafny source code is translated to another language, emit that translation.") {
   };
@@ -622,6 +627,7 @@ void ParsePrintMode(Option<PrintModes> option, Boogie.CommandLineParseState ps,
       DisableNonLinearArithmetic,
       NewTypeInferenceDebug,
       UseBaseFileName,
+      EmitUncompilableCode,
       WarnMissingConstructorParenthesis,
       UseJavadocLikeDocstringRewriterOption,
       IncludeRuntimeOption,
diff --git a/Source/DafnyCore/Options/DafnyCommands.cs b/Source/DafnyCore/Options/DafnyCommands.cs
index 3e0f6ddc0a7..51551086dc0 100644
--- a/Source/DafnyCore/Options/DafnyCommands.cs
+++ b/Source/DafnyCore/Options/DafnyCommands.cs
@@ -91,6 +91,7 @@ static DafnyCommands() {
     CommonOptionBag.QuantifierSyntax,
     CommonOptionBag.UnicodeCharacters,
     CommonOptionBag.UseBaseFileName,
+    CommonOptionBag.EmitUncompilableCode,
     CommonOptionBag.GeneralTraits,
     CommonOptionBag.GeneralNewtypes,
     CommonOptionBag.TypeSystemRefresh,
diff --git a/Source/DafnyCore/Resolver/ModuleResolver.cs b/Source/DafnyCore/Resolver/ModuleResolver.cs
index 184b6c08d44..e939583b02e 100644
--- a/Source/DafnyCore/Resolver/ModuleResolver.cs
+++ b/Source/DafnyCore/Resolver/ModuleResolver.cs
@@ -1039,6 +1039,8 @@ public void ResolveTopLevelDecls_Signatures(ModuleDefinition def, ModuleSignatur
       new NativeType("number", -0x1f_ffff_ffff_ffff, 0x20_0000_0000_0000, 0, NativeType.Selection.Number),  // JavaScript integers
       new NativeType("ulong", 0, new BigInteger(0x1_0000_0000) * new BigInteger(0x1_0000_0000), 64, NativeType.Selection.ULong),
       new NativeType("long", Int64.MinValue, 0x8000_0000_0000_0000, 0, NativeType.Selection.Long),
+      new NativeType("udoublelong", 0, new BigInteger(0x1_0000_0000) * new BigInteger(0x1_0000_0000) * new BigInteger(0x1_0000_0000) * new BigInteger(0x1_0000_0000), 128, NativeType.Selection.UDoubleLong),
+      new NativeType("doublelong", new BigInteger(-0x8000_0000_0000_0000)* new BigInteger(0x1_0000_0000) * new BigInteger(0x1_0000_0000), new BigInteger(0x8000_0000_0000_0000)* new BigInteger(0x1_0000_0000) * new BigInteger(0x1_0000_0000), 0, NativeType.Selection.DoubleLong),
     };
 
     public void ResolveTopLevelDecls_Core(List<TopLevelDecl> declarations,
diff --git a/Source/DafnyDriver/DafnyCliTests.cs b/Source/DafnyDriver/DafnyCliTests.cs
index ef2cebaa0f0..ecdd0e3b991 100644
--- a/Source/DafnyDriver/DafnyCliTests.cs
+++ b/Source/DafnyDriver/DafnyCliTests.cs
@@ -8,7 +8,16 @@ public static class DafnyCliTests {
   // Environment variables that the CLI directly or indirectly (through target language tools) reads.
   // This is defined for the benefit of testing infrastructure to ensure that they are maintained
   // through separate processes.
-  public static readonly string[] ReferencedEnvironmentVariables = { "PATH", "HOME", "DOTNET_NOLOGO" };
+  public static readonly string[] ReferencedEnvironmentVariables = {
+    "PATH",
+    "HOME",
+    "DOTNET_NOLOGO",
+    "DAFNY_INTEGRATION_TESTS_IN_PROCESS",
+    "DAFNY_INTEGRATION_TESTS_MODE",
+    "DAFNY_INTEGRATION_TESTS_ONLY_COMPILERS",
+    "DAFNY_INTEGRATION_TESTS_UPDATE_EXPECT_FILE",
+    "DAFNY_INTEGRATION_TESTS_ROOT_DIR"
+  };
 
   static DafnyCliTests() {
     if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows)) {
diff --git a/Source/DafnyRuntime.Tests/TupleTest.cs b/Source/DafnyRuntime.Tests/TupleTest.cs
new file mode 100644
index 00000000000..dd6025c9e5e
--- /dev/null
+++ b/Source/DafnyRuntime.Tests/TupleTest.cs
@@ -0,0 +1,448 @@
+using System;
+using Xunit;
+using Dafny;
+
+namespace DafnyRuntime.Tests {
+  public class TupleTests {
+
+    public Func<int, int> C = (int i) => i;
+    public Dafny.TypeDescriptor<int> D = new Dafny.TypeDescriptor<int>(0);
+
+    [Fact]
+    public void TestTuple2() {
+      var t = new _System.Tuple2<int, int>(0, 1);
+      Assert.Equal(t, t.DowncastClone(C, C));
+      Assert.NotEqual(0, t.GetHashCode());
+      Assert.Equal("(0, 1)", t.ToString());
+      Assert.Equal(t, _System.Tuple2<int, int>.Default(0, 1));
+      Assert.Equal(t, _System.Tuple2<int, int>.create____hMake2(0, 1));
+      Assert.Equal(_System.Tuple2<int, int>.create(0, 0), _System.Tuple2<int, int>._TypeDescriptor(D, D).Default());
+      Assert.Equal(0, t.dtor__0);
+      Assert.Equal(1, t.dtor__1);
+    }
+
+    // I am grateful for LLMs to generate all these tests.
+    [Fact]
+    public void TestTuple3() {
+      var t = new _System.Tuple3<int, int, int>(0, 1, 2);
+      Assert.Equal(t, t.DowncastClone(C, C, C));
+      Assert.NotEqual(0, t.GetHashCode());
+      Assert.Equal("(0, 1, 2)", t.ToString());
+      Assert.Equal(t, _System.Tuple3<int, int, int>.Default(0, 1, 2));
+      Assert.Equal(t, _System.Tuple3<int, int, int>.create____hMake3(0, 1, 2));
+      Assert.Equal(_System.Tuple3<int, int, int>.create(0, 0, 0),
+        _System.Tuple3<int, int, int>._TypeDescriptor(D, D, D).Default());
+      Assert.Equal(0, t.dtor__0);
+      Assert.Equal(1, t.dtor__1);
+      Assert.Equal(2, t.dtor__2);
+    }
+
+    [Fact]
+    public void TestTuple4() {
+      var t = new _System.Tuple4<int, int, int, int>(0, 1, 2, 3);
+      Assert.Equal(t, t.DowncastClone(C, C, C, C));
+      Assert.NotEqual(0, t.GetHashCode());
+      Assert.Equal("(0, 1, 2, 3)", t.ToString());
+      Assert.Equal(t, _System.Tuple4<int, int, int, int>.Default(0, 1, 2, 3));
+      Assert.Equal(t, _System.Tuple4<int, int, int, int>.create____hMake4(0, 1, 2, 3));
+      Assert.Equal(_System.Tuple4<int, int, int, int>.create(0, 0, 0, 0),
+        _System.Tuple4<int, int, int, int>._TypeDescriptor(D, D, D, D).Default());
+      Assert.Equal(0, t.dtor__0);
+      Assert.Equal(1, t.dtor__1);
+      Assert.Equal(2, t.dtor__2);
+      Assert.Equal(3, t.dtor__3);
+    }
+
+    [Fact]
+    public void TestTuple5() {
+      var t = new _System.Tuple5<int, int, int, int, int>(0, 1, 2, 3, 4);
+      Assert.Equal(t, t.DowncastClone(C, C, C, C, C));
+      Assert.NotEqual(0, t.GetHashCode());
+      Assert.Equal("(0, 1, 2, 3, 4)", t.ToString());
+      Assert.Equal(t, _System.Tuple5<int, int, int, int, int>.Default(0, 1, 2, 3, 4));
+      Assert.Equal(t, _System.Tuple5<int, int, int, int, int>.create____hMake5(0, 1, 2, 3, 4));
+      Assert.Equal(_System.Tuple5<int, int, int, int, int>.create(0, 0, 0, 0, 0),
+        _System.Tuple5<int, int, int, int, int>._TypeDescriptor(D, D, D, D, D).Default());
+      Assert.Equal(0, t.dtor__0);
+      Assert.Equal(1, t.dtor__1);
+      Assert.Equal(2, t.dtor__2);
+      Assert.Equal(3, t.dtor__3);
+      Assert.Equal(4, t.dtor__4);
+    }
+
+    [Fact]
+    public void TestTuple6() {
+      var t = new _System.Tuple6<int, int, int, int, int, int>(0, 1, 2, 3, 4, 5);
+      Assert.Equal(t, t.DowncastClone(C, C, C, C, C, C));
+      Assert.NotEqual(0, t.GetHashCode());
+      Assert.Equal("(0, 1, 2, 3, 4, 5)", t.ToString());
+      Assert.Equal(t, _System.Tuple6<int, int, int, int, int, int>.Default(0, 1, 2, 3, 4, 5));
+      Assert.Equal(t, _System.Tuple6<int, int, int, int, int, int>.create____hMake6(0, 1, 2, 3, 4, 5));
+      Assert.Equal(_System.Tuple6<int, int, int, int, int, int>.create(0, 0, 0, 0, 0, 0),
+        _System.Tuple6<int, int, int, int, int, int>._TypeDescriptor(D, D, D, D, D, D).Default());
+      Assert.Equal(0, t.dtor__0);
+      Assert.Equal(1, t.dtor__1);
+      Assert.Equal(2, t.dtor__2);
+      Assert.Equal(3, t.dtor__3);
+      Assert.Equal(4, t.dtor__4);
+      Assert.Equal(5, t.dtor__5);
+    }
+
+    [Fact]
+    public void TestTuple7() {
+      var t = new _System.Tuple7<int, int, int, int, int, int, int>(0, 1, 2, 3, 4, 5, 6);
+      Assert.Equal(t, t.DowncastClone(C, C, C, C, C, C, C));
+      Assert.NotEqual(0, t.GetHashCode());
+      Assert.Equal("(0, 1, 2, 3, 4, 5, 6)", t.ToString());
+      Assert.Equal(t, _System.Tuple7<int, int, int, int, int, int, int>.Default(0, 1, 2, 3, 4, 5, 6));
+      Assert.Equal(t, _System.Tuple7<int, int, int, int, int, int, int>.create____hMake7(0, 1, 2, 3, 4, 5, 6));
+      Assert.Equal(_System.Tuple7<int, int, int, int, int, int, int>.create(0, 0, 0, 0, 0, 0, 0),
+        _System.Tuple7<int, int, int, int, int, int, int>._TypeDescriptor(D, D, D, D, D, D, D).Default());
+      Assert.Equal(0, t.dtor__0);
+      Assert.Equal(1, t.dtor__1);
+      Assert.Equal(2, t.dtor__2);
+      Assert.Equal(3, t.dtor__3);
+      Assert.Equal(4, t.dtor__4);
+      Assert.Equal(5, t.dtor__5);
+      Assert.Equal(6, t.dtor__6);
+    }
+
+    [Fact]
+    public void TestTuple8() {
+      var t = new _System.Tuple8<int, int, int, int, int, int, int, int>(0, 1, 2, 3, 4, 5, 6, 7);
+      Assert.Equal(t, t.DowncastClone(C, C, C, C, C, C, C, C));
+      Assert.NotEqual(0, t.GetHashCode());
+      Assert.Equal("(0, 1, 2, 3, 4, 5, 6, 7)", t.ToString());
+      Assert.Equal(t, _System.Tuple8<int, int, int, int, int, int, int, int>.Default(0, 1, 2, 3, 4, 5, 6, 7));
+      Assert.Equal(t, _System.Tuple8<int, int, int, int, int, int, int, int>.create____hMake8(0, 1, 2, 3, 4, 5, 6, 7));
+      Assert.Equal(_System.Tuple8<int, int, int, int, int, int, int, int>.create(0, 0, 0, 0, 0, 0, 0, 0),
+          _System.Tuple8<int, int, int, int, int, int, int, int>._TypeDescriptor(D, D, D, D, D, D, D, D).Default());
+      Assert.Equal(0, t.dtor__0);
+      Assert.Equal(1, t.dtor__1);
+      Assert.Equal(2, t.dtor__2);
+      Assert.Equal(3, t.dtor__3);
+      Assert.Equal(4, t.dtor__4);
+      Assert.Equal(5, t.dtor__5);
+      Assert.Equal(6, t.dtor__6);
+      Assert.Equal(7, t.dtor__7);
+    }
+
+    [Fact]
+    public void TestTuple9() {
+      var t = new _System.Tuple9<int, int, int, int, int, int, int, int, int>(0, 1, 2, 3, 4, 5, 6, 7, 8);
+      Assert.Equal(t, t.DowncastClone(C, C, C, C, C, C, C, C, C));
+      Assert.NotEqual(0, t.GetHashCode());
+      Assert.Equal("(0, 1, 2, 3, 4, 5, 6, 7, 8)", t.ToString());
+      Assert.Equal(t, _System.Tuple9<int, int, int, int, int, int, int, int, int>.Default(0, 1, 2, 3, 4, 5, 6, 7, 8));
+      Assert.Equal(t, _System.Tuple9<int, int, int, int, int, int, int, int, int>.create____hMake9(0, 1, 2, 3, 4, 5, 6, 7, 8));
+      Assert.Equal(_System.Tuple9<int, int, int, int, int, int, int, int, int>.create(0, 0, 0, 0, 0, 0, 0, 0, 0),
+          _System.Tuple9<int, int, int, int, int, int, int, int, int>._TypeDescriptor(D, D, D, D, D, D, D, D, D).Default());
+      Assert.Equal(0, t.dtor__0);
+      Assert.Equal(1, t.dtor__1);
+      Assert.Equal(2, t.dtor__2);
+      Assert.Equal(3, t.dtor__3);
+      Assert.Equal(4, t.dtor__4);
+      Assert.Equal(5, t.dtor__5);
+      Assert.Equal(6, t.dtor__6);
+      Assert.Equal(7, t.dtor__7);
+      Assert.Equal(8, t.dtor__8);
+    }
+
+    [Fact]
+    public void TestTuple10() {
+      var t = new _System.Tuple10<int, int, int, int, int, int, int, int, int, int>(0, 1, 2, 3, 4, 5, 6, 7, 8, 9);
+      Assert.Equal(t, t.DowncastClone(C, C, C, C, C, C, C, C, C, C));
+      Assert.NotEqual(0, t.GetHashCode());
+      Assert.Equal("(0, 1, 2, 3, 4, 5, 6, 7, 8, 9)", t.ToString());
+      Assert.Equal(t, _System.Tuple10<int, int, int, int, int, int, int, int, int, int>.Default(0, 1, 2, 3, 4, 5, 6, 7, 8, 9));
+      Assert.Equal(t, _System.Tuple10<int, int, int, int, int, int, int, int, int, int>.create____hMake10(0, 1, 2, 3, 4, 5, 6, 7, 8, 9));
+      Assert.Equal(_System.Tuple10<int, int, int, int, int, int, int, int, int, int>.create(0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
+          _System.Tuple10<int, int, int, int, int, int, int, int, int, int>._TypeDescriptor(D, D, D, D, D, D, D, D, D, D).Default());
+      Assert.Equal(0, t.dtor__0);
+      Assert.Equal(1, t.dtor__1);
+      Assert.Equal(2, t.dtor__2);
+      Assert.Equal(3, t.dtor__3);
+      Assert.Equal(4, t.dtor__4);
+      Assert.Equal(5, t.dtor__5);
+      Assert.Equal(6, t.dtor__6);
+      Assert.Equal(7, t.dtor__7);
+      Assert.Equal(8, t.dtor__8);
+      Assert.Equal(9, t.dtor__9);
+    }
+
+    [Fact]
+    public void TestTuple11() {
+      var t = new _System.Tuple11<int, int, int, int, int, int, int, int, int, int, int>(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
+      Assert.Equal(t, t.DowncastClone(C, C, C, C, C, C, C, C, C, C, C));
+      Assert.NotEqual(0, t.GetHashCode());
+      Assert.Equal("(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10)", t.ToString());
+      Assert.Equal(t, _System.Tuple11<int, int, int, int, int, int, int, int, int, int, int>.Default(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10));
+      Assert.Equal(t, _System.Tuple11<int, int, int, int, int, int, int, int, int, int, int>.create____hMake11(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10));
+      Assert.Equal(_System.Tuple11<int, int, int, int, int, int, int, int, int, int, int>.create(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
+          _System.Tuple11<int, int, int, int, int, int, int, int, int, int, int>._TypeDescriptor(D, D, D, D, D, D, D, D, D, D, D).Default());
+      Assert.Equal(0, t.dtor__0);
+      Assert.Equal(1, t.dtor__1);
+      Assert.Equal(2, t.dtor__2);
+      Assert.Equal(3, t.dtor__3);
+      Assert.Equal(4, t.dtor__4);
+      Assert.Equal(5, t.dtor__5);
+      Assert.Equal(6, t.dtor__6);
+      Assert.Equal(7, t.dtor__7);
+      Assert.Equal(8, t.dtor__8);
+      Assert.Equal(9, t.dtor__9);
+      Assert.Equal(10, t.dtor__10);
+    }
+
+    [Fact]
+    public void TestTuple12() {
+      var t = new _System.Tuple12<int, int, int, int, int, int, int, int, int, int, int, int>(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11);
+      Assert.Equal(t, t.DowncastClone(C, C, C, C, C, C, C, C, C, C, C, C));
+      Assert.NotEqual(0, t.GetHashCode());
+      Assert.Equal("(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11)", t.ToString());
+      Assert.Equal(t, _System.Tuple12<int, int, int, int, int, int, int, int, int, int, int, int>.Default(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11));
+      Assert.Equal(t, _System.Tuple12<int, int, int, int, int, int, int, int, int, int, int, int>.create____hMake12(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11));
+      Assert.Equal(_System.Tuple12<int, int, int, int, int, int, int, int, int, int, int, int>.create(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
+          _System.Tuple12<int, int, int, int, int, int, int, int, int, int, int, int>._TypeDescriptor(D, D, D, D, D, D, D, D, D, D, D, D).Default());
+      Assert.Equal(0, t.dtor__0);
+      Assert.Equal(1, t.dtor__1);
+      Assert.Equal(2, t.dtor__2);
+      Assert.Equal(3, t.dtor__3);
+      Assert.Equal(4, t.dtor__4);
+      Assert.Equal(5, t.dtor__5);
+      Assert.Equal(6, t.dtor__6);
+      Assert.Equal(7, t.dtor__7);
+      Assert.Equal(8, t.dtor__8);
+      Assert.Equal(9, t.dtor__9);
+      Assert.Equal(10, t.dtor__10);
+      Assert.Equal(11, t.dtor__11);
+    }
+
+    [Fact]
+    public void TestTuple13() {
+      var t = new _System.Tuple13<int, int, int, int, int, int, int, int, int, int, int, int, int>(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12);
+      Assert.Equal(t, t.DowncastClone(C, C, C, C, C, C, C, C, C, C, C, C, C));
+      Assert.NotEqual(0, t.GetHashCode());
+      Assert.Equal("(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)", t.ToString());
+      Assert.Equal(t, _System.Tuple13<int, int, int, int, int, int, int, int, int, int, int, int, int>.Default(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12));
+      Assert.Equal(t, _System.Tuple13<int, int, int, int, int, int, int, int, int, int, int, int, int>.create____hMake13(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12));
+      Assert.Equal(_System.Tuple13<int, int, int, int, int, int, int, int, int, int, int, int, int>.create(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
+          _System.Tuple13<int, int, int, int, int, int, int, int, int, int, int, int, int>._TypeDescriptor(D, D, D, D, D, D, D, D, D, D, D, D, D).Default());
+      Assert.Equal(0, t.dtor__0);
+      Assert.Equal(1, t.dtor__1);
+      Assert.Equal(2, t.dtor__2);
+      Assert.Equal(3, t.dtor__3);
+      Assert.Equal(4, t.dtor__4);
+      Assert.Equal(5, t.dtor__5);
+      Assert.Equal(6, t.dtor__6);
+      Assert.Equal(7, t.dtor__7);
+      Assert.Equal(8, t.dtor__8);
+      Assert.Equal(9, t.dtor__9);
+      Assert.Equal(10, t.dtor__10);
+      Assert.Equal(11, t.dtor__11);
+      Assert.Equal(12, t.dtor__12);
+    }
+
+    [Fact]
+    public void TestTuple14() {
+      var t = new _System.Tuple14<int, int, int, int, int, int, int, int, int, int, int, int, int, int>(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13);
+      Assert.Equal(t, t.DowncastClone(C, C, C, C, C, C, C, C, C, C, C, C, C, C));
+      Assert.NotEqual(0, t.GetHashCode());
+      Assert.Equal("(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)", t.ToString());
+      Assert.Equal(t, _System.Tuple14<int, int, int, int, int, int, int, int, int, int, int, int, int, int>.Default(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13));
+      Assert.Equal(t, _System.Tuple14<int, int, int, int, int, int, int, int, int, int, int, int, int, int>.create____hMake14(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13));
+      Assert.Equal(_System.Tuple14<int, int, int, int, int, int, int, int, int, int, int, int, int, int>.create(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
+          _System.Tuple14<int, int, int, int, int, int, int, int, int, int, int, int, int, int>._TypeDescriptor(D, D, D, D, D, D, D, D, D, D, D, D, D, D).Default());
+      Assert.Equal(0, t.dtor__0);
+      Assert.Equal(1, t.dtor__1);
+      Assert.Equal(2, t.dtor__2);
+      Assert.Equal(3, t.dtor__3);
+      Assert.Equal(4, t.dtor__4);
+      Assert.Equal(5, t.dtor__5);
+      Assert.Equal(6, t.dtor__6);
+      Assert.Equal(7, t.dtor__7);
+      Assert.Equal(8, t.dtor__8);
+      Assert.Equal(9, t.dtor__9);
+      Assert.Equal(10, t.dtor__10);
+      Assert.Equal(11, t.dtor__11);
+      Assert.Equal(12, t.dtor__12);
+      Assert.Equal(13, t.dtor__13);
+    }
+
+    [Fact]
+    public void TestTuple15() {
+      var t = new _System.Tuple15<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14);
+      Assert.Equal(t, t.DowncastClone(C, C, C, C, C, C, C, C, C, C, C, C, C, C, C));
+      Assert.NotEqual(0, t.GetHashCode());
+      Assert.Equal("(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)", t.ToString());
+      Assert.Equal(t, _System.Tuple15<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>.Default(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14));
+      Assert.Equal(t, _System.Tuple15<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>.create____hMake15(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14));
+      Assert.Equal(_System.Tuple15<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>.create(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
+          _System.Tuple15<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>._TypeDescriptor(D, D, D, D, D, D, D, D, D, D, D, D, D, D, D).Default());
+      Assert.Equal(0, t.dtor__0);
+      Assert.Equal(1, t.dtor__1);
+      Assert.Equal(2, t.dtor__2);
+      Assert.Equal(3, t.dtor__3);
+      Assert.Equal(4, t.dtor__4);
+      Assert.Equal(5, t.dtor__5);
+      Assert.Equal(6, t.dtor__6);
+      Assert.Equal(7, t.dtor__7);
+      Assert.Equal(8, t.dtor__8);
+      Assert.Equal(9, t.dtor__9);
+      Assert.Equal(10, t.dtor__10);
+      Assert.Equal(11, t.dtor__11);
+      Assert.Equal(12, t.dtor__12);
+      Assert.Equal(13, t.dtor__13);
+      Assert.Equal(14, t.dtor__14);
+    }
+    [Fact]
+    public void TestTuple16() {
+      var t = new _System.Tuple16<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15);
+      Assert.Equal(t, t.DowncastClone(C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C));
+      Assert.NotEqual(0, t.GetHashCode());
+      Assert.Equal("(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)", t.ToString());
+      Assert.Equal(t, _System.Tuple16<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>.Default(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15));
+      Assert.Equal(t, _System.Tuple16<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>.create____hMake16(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15));
+      Assert.Equal(_System.Tuple16<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>.create(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
+          _System.Tuple16<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>._TypeDescriptor(D, D, D, D, D, D, D, D, D, D, D, D, D, D, D, D).Default());
+      Assert.Equal(0, t.dtor__0);
+      Assert.Equal(1, t.dtor__1);
+      Assert.Equal(2, t.dtor__2);
+      Assert.Equal(3, t.dtor__3);
+      Assert.Equal(4, t.dtor__4);
+      Assert.Equal(5, t.dtor__5);
+      Assert.Equal(6, t.dtor__6);
+      Assert.Equal(7, t.dtor__7);
+      Assert.Equal(8, t.dtor__8);
+      Assert.Equal(9, t.dtor__9);
+      Assert.Equal(10, t.dtor__10);
+      Assert.Equal(11, t.dtor__11);
+      Assert.Equal(12, t.dtor__12);
+      Assert.Equal(13, t.dtor__13);
+      Assert.Equal(14, t.dtor__14);
+      Assert.Equal(15, t.dtor__15);
+    }
+
+    [Fact]
+    public void TestTuple17() {
+      var t = new _System.Tuple17<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16);
+      Assert.Equal(t, t.DowncastClone(C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C));
+      Assert.NotEqual(0, t.GetHashCode());
+      Assert.Equal("(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)", t.ToString());
+      Assert.Equal(t, _System.Tuple17<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>.Default(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16));
+      Assert.Equal(t, _System.Tuple17<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>.create____hMake17(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16));
+      Assert.Equal(_System.Tuple17<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>.create(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
+          _System.Tuple17<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>._TypeDescriptor(D, D, D, D, D, D, D, D, D, D, D, D, D, D, D, D, D).Default());
+      Assert.Equal(0, t.dtor__0);
+      Assert.Equal(1, t.dtor__1);
+      Assert.Equal(2, t.dtor__2);
+      Assert.Equal(3, t.dtor__3);
+      Assert.Equal(4, t.dtor__4);
+      Assert.Equal(5, t.dtor__5);
+      Assert.Equal(6, t.dtor__6);
+      Assert.Equal(7, t.dtor__7);
+      Assert.Equal(8, t.dtor__8);
+      Assert.Equal(9, t.dtor__9);
+      Assert.Equal(10, t.dtor__10);
+      Assert.Equal(11, t.dtor__11);
+      Assert.Equal(12, t.dtor__12);
+      Assert.Equal(13, t.dtor__13);
+      Assert.Equal(14, t.dtor__14);
+      Assert.Equal(15, t.dtor__15);
+      Assert.Equal(16, t.dtor__16);
+    }
+
+    [Fact]
+    public void TestTuple18() {
+      var t = new _System.Tuple18<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17);
+      Assert.Equal(t, t.DowncastClone(C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C));
+      Assert.NotEqual(0, t.GetHashCode());
+      Assert.Equal("(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)", t.ToString());
+      Assert.Equal(t, _System.Tuple18<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>.Default(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17));
+      Assert.Equal(t, _System.Tuple18<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>.create____hMake18(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17));
+      Assert.Equal(_System.Tuple18<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>.create(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
+          _System.Tuple18<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>._TypeDescriptor(D, D, D, D, D, D, D, D, D, D, D, D, D, D, D, D, D, D).Default());
+      Assert.Equal(0, t.dtor__0);
+      Assert.Equal(1, t.dtor__1);
+      Assert.Equal(2, t.dtor__2);
+      Assert.Equal(3, t.dtor__3);
+      Assert.Equal(4, t.dtor__4);
+      Assert.Equal(5, t.dtor__5);
+      Assert.Equal(6, t.dtor__6);
+      Assert.Equal(7, t.dtor__7);
+      Assert.Equal(8, t.dtor__8);
+      Assert.Equal(9, t.dtor__9);
+      Assert.Equal(10, t.dtor__10);
+      Assert.Equal(11, t.dtor__11);
+      Assert.Equal(12, t.dtor__12);
+      Assert.Equal(13, t.dtor__13);
+      Assert.Equal(14, t.dtor__14);
+      Assert.Equal(15, t.dtor__15);
+      Assert.Equal(16, t.dtor__16);
+      Assert.Equal(17, t.dtor__17);
+    }
+
+    [Fact]
+    public void TestTuple19() {
+      var t = new _System.Tuple19<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18);
+      Assert.Equal(t, t.DowncastClone(C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C));
+      Assert.NotEqual(0, t.GetHashCode());
+      Assert.Equal("(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)", t.ToString());
+      Assert.Equal(t, _System.Tuple19<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>.Default(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18));
+      Assert.Equal(t, _System.Tuple19<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>.create____hMake19(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18));
+      Assert.Equal(_System.Tuple19<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>.create(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
+          _System.Tuple19<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>._TypeDescriptor(D, D, D, D, D, D, D, D, D, D, D, D, D, D, D, D, D, D, D).Default());
+      Assert.Equal(0, t.dtor__0);
+      Assert.Equal(1, t.dtor__1);
+      Assert.Equal(2, t.dtor__2);
+      Assert.Equal(3, t.dtor__3);
+      Assert.Equal(4, t.dtor__4);
+      Assert.Equal(5, t.dtor__5);
+      Assert.Equal(6, t.dtor__6);
+      Assert.Equal(7, t.dtor__7);
+      Assert.Equal(8, t.dtor__8);
+      Assert.Equal(9, t.dtor__9);
+      Assert.Equal(10, t.dtor__10);
+      Assert.Equal(11, t.dtor__11);
+      Assert.Equal(12, t.dtor__12);
+      Assert.Equal(13, t.dtor__13);
+      Assert.Equal(14, t.dtor__14);
+      Assert.Equal(15, t.dtor__15);
+      Assert.Equal(16, t.dtor__16);
+      Assert.Equal(17, t.dtor__17);
+      Assert.Equal(18, t.dtor__18);
+    }
+
+    [Fact]
+    public void TestTuple20() {
+      var t = new _System.Tuple20<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19);
+      Assert.Equal(t, t.DowncastClone(C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C));
+      Assert.NotEqual(0, t.GetHashCode());
+      Assert.Equal("(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)", t.ToString());
+      Assert.Equal(t, _System.Tuple20<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>.Default(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19));
+      Assert.Equal(t, _System.Tuple20<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>.create____hMake20(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19));
+      Assert.Equal(_System.Tuple20<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>.create(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
+          _System.Tuple20<int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int>._TypeDescriptor(D, D, D, D, D, D, D, D, D, D, D, D, D, D, D, D, D, D, D, D).Default());
+      Assert.Equal(0, t.dtor__0);
+      Assert.Equal(1, t.dtor__1);
+      Assert.Equal(2, t.dtor__2);
+      Assert.Equal(3, t.dtor__3);
+      Assert.Equal(4, t.dtor__4);
+      Assert.Equal(5, t.dtor__5);
+      Assert.Equal(6, t.dtor__6);
+      Assert.Equal(7, t.dtor__7);
+      Assert.Equal(8, t.dtor__8);
+      Assert.Equal(9, t.dtor__9);
+      Assert.Equal(10, t.dtor__10);
+      Assert.Equal(11, t.dtor__11);
+      Assert.Equal(12, t.dtor__12);
+      Assert.Equal(13, t.dtor__13);
+      Assert.Equal(14, t.dtor__14);
+      Assert.Equal(15, t.dtor__15);
+      Assert.Equal(16, t.dtor__16);
+      Assert.Equal(17, t.dtor__17);
+      Assert.Equal(18, t.dtor__18);
+      Assert.Equal(19, t.dtor__19);
+    }
+
+  }
+}
diff --git a/Source/DafnyRuntime/DafnyRuntimeRust/src/lib.rs b/Source/DafnyRuntime/DafnyRuntimeRust/src/lib.rs
index b8b531db4d0..b8b4f3aa6a5 100644
--- a/Source/DafnyRuntime/DafnyRuntimeRust/src/lib.rs
+++ b/Source/DafnyRuntime/DafnyRuntimeRust/src/lib.rs
@@ -1,11 +1,7 @@
 #[cfg(test)]
 mod tests;
-use std::{fmt::{Display, Formatter},
-          rc::Rc, ops::{Deref, Add},
-          collections::{HashSet, HashMap},
-          cell::RefCell, any::Any};
-use num::{Integer, Signed, One};
-use as_any::AsAny;
+use std::{any::Any, borrow::Borrow, cell::{RefCell, UnsafeCell}, cmp::Ordering, collections::{HashMap, HashSet}, fmt::{Debug, Display, Formatter}, hash::{Hash, Hasher}, ops::{Add, Deref, Div, Mul, Neg, Rem, Sub}, rc::Rc};
+use num::{bigint::ParseBigIntError, Integer, Num, One, Signed, ToPrimitive};
 
 pub use once_cell::unsync::Lazy;
 
@@ -19,6 +15,10 @@ pub use itertools;
 // An atomic box is just a RefCell in Rust
 pub type SizeT = usize;
 
+// Dafny types must be clonable in constant time
+pub trait DafnyType: Clone + DafnyPrint + Debug {}
+pub trait DafnyTypeEq: DafnyType + Hash + Eq {}
+
 /******************************************************************************
  * Sequences
  ******************************************************************************/
@@ -30,100 +30,380 @@ pub type SizeT = usize;
 // We use the named version using {...}, and use snake_case format
 
 // The T must be either a *const T (allocated) OR a Reference Counting (immutable)
+pub mod dafny_runtime_conversions {
+    use crate::DafnyType;
+    use crate::DafnyTypeEq;
+    pub type DafnyInt = crate::DafnyInt;
+    pub type DafnySequence<T> = crate::Sequence<T>;
+    pub type DafnyMap<K, V> = crate::Map<K, V>;
+    pub type DafnySet<T> = crate::Set<T>;
+    pub type DafnyMultiset<T> = crate::Multiset<T>;
+    pub type DafnyBool = bool;
 
-#[allow(dead_code)]
-mod dafny_runtime_conversions {
     use num::BigInt;
+    use num::ToPrimitive;
 
-    use crate::Sequence;
-    use crate::Map;
-    use std::cell::RefCell;
     use std::collections::HashMap;
+    use std::collections::HashSet;
     use std::rc::Rc;
     use std::hash::Hash;
-    pub fn dafny_int_to_bigint(i: &Rc<BigInt>) -> BigInt {
-        i.as_ref().clone()
+
+    pub fn dafny_int_to_bigint(i: &DafnyInt) -> BigInt {
+        i.data.as_ref().clone()
     }
-    pub fn bigint_to_dafny_int(i: &BigInt) -> Rc<BigInt> {
-        Rc::new(i.clone())
+    pub fn bigint_to_dafny_int(i: &BigInt) -> DafnyInt {
+        DafnyInt{data: Rc::new(i.clone())}
     }
 
-    pub fn dafny_sequence_to_vec<T, X>(s: &Sequence<T>, elem_converter: fn(&T) -> X) -> Vec<X>
-      where T: Clone
+    pub fn dafny_sequence_to_vec<T, X>(
+        s: &DafnySequence<T>,
+        elem_converter: fn(&T) -> X) -> Vec<X>
+      where T: DafnyType
     {
-        let mut array: Vec<T> = Vec::with_capacity(s.cardinality());
-        Sequence::<T>::append_recursive(&mut array, s);
+        let mut array: Vec<T> = Vec::with_capacity(s.cardinality_usize());
+        DafnySequence::<T>::append_recursive(&mut array, s);
         array.iter().map(|x| elem_converter(x)).collect()
     }
 
     // Used for external conversions
-    pub fn vec_to_dafny_sequence<T, X>(array: &Vec<X>, elem_converter: fn(&X) -> T) -> Rc<Sequence<T>>
-      where T: Clone
+    pub fn vec_to_dafny_sequence<T, X>(array: &Vec<X>, elem_converter: fn(&X) -> T)
+     -> DafnySequence<T>
+      where T: DafnyType
     {
         let mut result: Vec<T> = Vec::with_capacity(array.len());
         for elem in array.iter() {
             result.push(elem_converter(elem));
         }
-        Sequence::<T>::new_array_sequence(&Rc::new(result))
+        DafnySequence::<T>::from_array_owned(result)
     }
     
-    fn dafny_map_to_hashmap<K, V, K2, V2>(m: &Rc<Map<K, V>>, converter_k: fn(&K)->K2, converter_v: fn(&V)->V2) -> HashMap<K2, V2>
+    pub fn dafny_map_to_hashmap<K, V, K2, V2>(m: &DafnyMap<K, V>, converter_k: fn(&K)->K2, converter_v: fn(&V)->V2) -> HashMap<K2, V2>
       where
-          K: Eq + Clone + Hash, V: Clone,
+          K: DafnyTypeEq, V: DafnyTypeEq,
           K2: Eq + Hash, V2: Clone
     {
         m.to_hashmap_owned(converter_k, converter_v)
     }
 
-    fn hashmap_to_dafny_map<K2, V2, K, V>(map: &HashMap<K2, V2>, converter_k: fn(&K2)->K, converter_v: fn(&V2)->V)
-        -> Rc<Map<K, V>>
+    pub fn hashmap_to_dafny_map<K2, V2, K, V>(map: &HashMap<K2, V2>, converter_k: fn(&K2)->K, converter_v: fn(&V2)->V)
+        -> DafnyMap<K, V>
       where
-        K: Eq + Clone + Hash, V: Clone,
+        K: DafnyTypeEq, V: DafnyTypeEq,
         K2: Eq + Hash, V2: Clone
     {
-        let mut result: Vec<(K, V)> = Vec::new();
-        for (k, v) in map.iter() {
-            result.push((converter_k(k), converter_v(v)));
-        }
-        let s = Sequence::<(K, V)>::new_array_sequence(&Rc::new(result));
-        Rc::new(Map {
-            data: s,
-            cache: RefCell::new(None)
-        })
+        DafnyMap::<K, V>::from_hashmap(map, converter_k, converter_v)
     }
 
     // --unicode-chars:true
     pub mod unicode_chars_true {
         use crate::Sequence;
-        use std::rc::Rc;
 
-        pub fn string_to_dafny_string(s: &str) -> Rc<Sequence<char>> {
-            Sequence::new_array_sequence(&Rc::new(s.chars().collect()))
+        type DafnyChar = crate::DafnyChar;
+        type DafnyString = Sequence<DafnyChar>;
+
+        pub fn string_to_dafny_string(s: &str) -> DafnyString {
+            Sequence::from_array_owned(s.chars().map(|v| crate::DafnyChar(v)).collect())
         }
-        pub fn dafny_string_to_string(s: &Rc<Sequence<char>>) -> String {
+        pub fn dafny_string_to_string(s: &DafnyString) -> String {
             let characters = s.to_array();
-            characters.iter().collect::<String>()
+            characters.iter().map(|v| v.0).collect::<String>()
         }
     }
     
     // --unicode-chars:false
     pub mod unicode_chars_false {
         use crate::Sequence;
-        use std::rc::Rc;
-        pub fn string_to_dafny_string(s: &str) -> Rc<Sequence<u16>> {
-            Sequence::new_array_sequence(&Rc::new(s.encode_utf16().collect()))
+
+        type DafnyCharUTF16 = crate::DafnyCharUTF16;
+        type DafnyString = Sequence<DafnyCharUTF16>;
+
+        pub fn string_to_dafny_string(s: &str) -> DafnyString {
+            Sequence::from_array_owned(s.encode_utf16().map(|v| crate::DafnyCharUTF16(v)).collect())
         }
-        pub fn dafny_string_to_string(s: &Rc<Sequence<u16>>) -> String {
-            let characters = s.to_array();
-            String::from_utf16(&characters).unwrap()
+        pub fn dafny_string_to_string(s: &DafnyString) -> String {
+            let characters = s.to_array().as_ref().iter().map(|v| v.0).collect::<Vec<_>>();
+            String::from_utf16_lossy(&characters)
         }
     }
     
+    pub fn set_to_dafny_set<U, T: DafnyTypeEq>(set: &HashSet<U>, converter: fn(&U) -> T)
+      -> DafnySet<T>
+    {
+        DafnySet::from_iterator(set.iter().map(converter))
+    }
+    pub fn dafny_set_to_set<T, U>(set: &DafnySet<T>, converter: fn(&T) -> U) -> HashSet<U>
+        where T: DafnyTypeEq, U: Clone + Eq + Hash
+    {
+        let mut result: HashSet<U> = HashSet::new();
+        for s in set.data.iter() {
+            result.insert(converter(s));
+        }
+        result
+    }
+
+    pub fn dafny_multiset_to_owned_vec<T, U>(ms: &DafnyMultiset<T>, converter: fn(&T) -> U) -> Vec<U>
+        where T: DafnyTypeEq, U: Clone + Eq
+    {
+        let mut result: Vec<U> = Vec::new();
+        for s in ms.data.iter() {
+            // Push T as many times as its size
+            for _ in 0..s.1.data.to_usize().unwrap() {
+                result.push(converter(&s.0));
+            }
+        }
+        result
+    }
+
+    pub fn vec_to_dafny_multiset<T, U>(vec: &Vec<U>, converter: fn(&U) -> T) -> DafnyMultiset<T>
+        where T: DafnyTypeEq, U: Clone + Eq + Hash
+    {
+        DafnyMultiset::from_iterator(
+            vec.into_iter().map(|u: &U| converter(u))
+        )
+    }
+
+}
+
+
+// **************
+// Dafny integers
+// **************
+
+// Zero-cost abstraction over a Rc<BigInt>
+#[derive(Clone)]
+pub struct DafnyInt {
+    data: Rc<BigInt>
+}
+
+impl ToPrimitive for DafnyInt {
+    fn to_i64(&self) -> Option<i64> {
+        self.data.to_i64()
+    }
+
+    fn to_u64(&self) -> Option<u64> {
+        self.data.to_u64()
+    }
+}
+
+impl DafnyType for DafnyInt {}
+impl DafnyTypeEq for DafnyInt {}
+
+impl Default for DafnyInt {
+    fn default() -> Self {
+        DafnyInt{data: Rc::new(BigInt::zero())}
+    }
+}
+
+impl PartialEq<DafnyInt> for DafnyInt {
+    fn eq(&self, other: &DafnyInt) -> bool {
+        self.data.eq(&other.data)
+    }
+}
+impl Eq for DafnyInt {}
+impl Hash for DafnyInt {
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        self.data.hash(state);
+    }
+}
+
+impl DafnyPrint for DafnyInt {
+    fn fmt_print(&self, f: &mut Formatter<'_>, _in_seq: bool) -> std::fmt::Result {
+        write!(f, "{}", self.data)
+    }
+}
+
+impl Debug for DafnyInt {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.data)
+    }
+}
+
+impl Add<DafnyInt> for DafnyInt {
+    type Output = DafnyInt;
+
+    fn add(self, rhs: DafnyInt) -> Self::Output {
+        DafnyInt{data: Rc::new(self.data.as_ref() + rhs.data.as_ref())}
+    }
+}
+
+impl Mul<DafnyInt> for DafnyInt {
+    type Output = DafnyInt;
+
+    fn mul(self, rhs: DafnyInt) -> Self::Output {
+        DafnyInt{data: Rc::new(self.data.as_ref() * rhs.data.as_ref())}
+    }
 }
 
-#[allow(dead_code)]
-enum Sequence<T>
-  where T: Clone,
+impl Div<DafnyInt> for DafnyInt {
+    type Output = DafnyInt;
+
+    fn div(self, rhs: DafnyInt) -> Self::Output {
+        DafnyInt{data: Rc::new(self.data.as_ref() / rhs.data.as_ref())}
+    }
+}
+
+impl Sub<DafnyInt> for DafnyInt {
+    type Output = DafnyInt;
+
+    fn sub(self, rhs: DafnyInt) -> Self::Output {
+        DafnyInt{data: Rc::new(self.data.as_ref() - rhs.data.as_ref())}
+    }
+}
+impl Rem<DafnyInt> for DafnyInt {
+    type Output = DafnyInt;
+
+    fn rem(self, rhs: DafnyInt) -> Self::Output {
+        DafnyInt{data: Rc::new(self.data.as_ref() % rhs.data.as_ref())}
+    }
+}
+impl Neg for DafnyInt {
+    type Output = DafnyInt;
+
+    #[inline]
+    fn neg(self) -> Self::Output {
+        DafnyInt{data: Rc::new(-self.data.as_ref())}
+    }
+}
+impl Zero for DafnyInt {
+    #[inline]
+    fn zero() -> Self {
+        DafnyInt{data: Rc::new(BigInt::zero())}
+    }
+    #[inline]
+    fn is_zero(&self) -> bool {
+        self.data.is_zero()
+    }
+}
+impl One for DafnyInt {
+    #[inline]
+    fn one() -> Self {
+        DafnyInt{data: Rc::new(BigInt::one())}
+    }
+}
+impl Num for DafnyInt {
+    type FromStrRadixErr = ParseBigIntError;
+
+    #[inline]
+    fn from_str_radix(s: &str, radix: u32) -> Result<Self, Self::FromStrRadixErr> {
+        Ok(DafnyInt{data: Rc::new(BigInt::from_str_radix(s, radix)?)})
+    }
+}
+impl Ord for DafnyInt {
+    #[inline]
+    fn cmp(&self, other: &Self) -> Ordering {
+        self.data.cmp(&other.data)
+    }
+}
+impl Signed for DafnyInt {
+    #[inline]
+    fn abs(&self) -> Self {
+        DafnyInt{data: Rc::new(self.data.as_ref().abs())}
+    }
+
+    #[inline]
+    fn abs_sub(&self, other: &Self) -> Self {
+        DafnyInt{data: Rc::new(self.data.as_ref().abs_sub(other.data.as_ref()))}
+    }
+
+    #[inline]
+    fn signum(&self) -> Self {
+        DafnyInt{data: Rc::new(self.data.as_ref().signum())}
+    }
+
+    #[inline]
+    fn is_positive(&self) -> bool {
+        self.data.as_ref().is_positive()
+    }
+
+    #[inline]
+    fn is_negative(&self) -> bool {
+        self.data.as_ref().is_negative()
+    }
+}
+
+// Comparison
+impl PartialOrd<DafnyInt> for DafnyInt {
+    #[inline]
+    fn partial_cmp(&self, other: &DafnyInt) -> Option<Ordering> {
+        self.data.partial_cmp(&other.data)
+    }
+}
+
+impl DafnyInt {
+    #[inline]
+    pub fn parse_bytes(number: &[u8], radix: u32) -> DafnyInt {
+        DafnyInt{data: ::std::rc::Rc::new(BigInt::parse_bytes(number, radix).unwrap())}
+    }
+    pub fn from_usize(usize: usize) -> DafnyInt {
+        DafnyInt{data: Rc::new(BigInt::from(usize))}
+    }
+    pub fn from_i32(i: i32) -> DafnyInt {
+        DafnyInt{data: Rc::new(BigInt::from(i))}
+    }
+}
+
+macro_rules! impl_dafnyint_from{
+    () => {};
+    ($type:ident) => {
+        impl From<$type> for DafnyInt
+        {
+            fn from(n: $type) -> Self {
+                DafnyInt{data: Rc::new(n.into())}
+            }
+        }
+    };
+}
+
+impl_dafnyint_from! { u8 }
+impl_dafnyint_from! { u16 }
+impl_dafnyint_from! { u32 }
+impl_dafnyint_from! { u64 }
+impl_dafnyint_from! { u128 }
+impl_dafnyint_from! { i8 }
+impl_dafnyint_from! { i16 }
+impl_dafnyint_from! { i32 }
+impl_dafnyint_from! { i64 }
+impl_dafnyint_from! { i128 }
+impl_dafnyint_from! { usize }
+
+impl <'a> From<&'a [u8]> for DafnyInt {
+    fn from(number: &[u8]) -> Self {
+        DafnyInt::parse_bytes(number, 10)
+    }
+}
+
+// **************
+// Immutable sequences
+// **************
+
+impl <T: DafnyType> DafnyType for Sequence<T> {}
+impl <T: DafnyTypeEq> DafnyTypeEq for Sequence<T> {}
+impl <T: DafnyTypeEq> Eq for Sequence<T> {}
+
+impl <T: DafnyType> Add<&Sequence<T>> for &Sequence<T>
+{
+    type Output = Sequence<T>;
+
+    fn add(self, rhs: &Sequence<T>) -> Self::Output {
+        Sequence::new_concat_sequence(self, rhs)
+    }
+}
+
+impl <T: DafnyTypeEq> Hash for Sequence<T> {
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        self.cardinality_usize().hash(state);
+        let array = self.to_array();
+        // Iterate over the elements
+        for elt in array.iter() {
+            elt.hash(state);
+        }
+    }
+}
+
+// Clone can be derived automatically
+#[derive(Clone)]
+pub enum Sequence<T>
+  where T: DafnyType,
 {
     ArraySequence {
         // Values could be a native array because we will know statically that all 
@@ -131,174 +411,954 @@ enum Sequence<T>
         values: Rc<Vec<T>>,
     },
     ConcatSequence {
-        left: Rc<Sequence<T>>,
-        right: Rc<Sequence<T>>,
+        left: Rc<UnsafeCell<Sequence<T>>>,
+        right: Rc<UnsafeCell<Sequence<T>>>,
         length: SizeT,
-    },
-    LazySequence {
-        length: SizeT,
-        boxed: RefCell<Rc<Sequence<T>>>
+        boxed: Rc<RefCell<Option<Rc<Vec<T>>>>>
     }
 }
 
-#[allow(dead_code)]
 impl <T> Sequence<T>
-where T: Clone {
-    fn new_array_sequence(values: &Rc<Vec<T>>) -> Rc<Sequence<T>> {        
-        Rc::new(Sequence::ArraySequence {
-            values: Rc::clone(values),
-        })
-    }
-    fn new_concat_sequence(left: &Rc<Sequence<T>>, right: &Rc<Sequence<T>>) -> Rc<Sequence<T>> {
-       Rc::new(Sequence::ConcatSequence {
-            left: Rc::clone(&left),
-            right: Rc::clone(&right),
-            length: left.cardinality() + right.cardinality(),
-        })
-    }
-    fn new_lazy_sequence(boxed: &Rc<Sequence<T>>) -> Rc<Sequence<T>> {
-        Rc::new(Sequence::LazySequence {
-            length: boxed.cardinality(),
-            boxed: RefCell::new(Rc::clone(boxed)),
-        })
-    }
-
-    fn to_array(&self) -> Rc<Vec<T>> {
-        // We convert the match above to statements using the Rust "it" idiom
-        if let Sequence::ArraySequence { values, .. } = self {
-            // The length of the elements
-            Rc::clone(values)
-        } else if let Sequence::ConcatSequence { length, .. } = self {
-            let mut array: Vec<T> = Vec::with_capacity(*length);
-            Sequence::<T>::append_recursive(&mut array, self);
-            Rc::new(array)
-        } else if let Sequence::LazySequence { boxed, ..  } = self {
-            let result = boxed.borrow().to_array();
-            // Put the value back into boxed
-            boxed.replace(Rc::clone(
-                &Sequence::<T>::new_array_sequence(&result)));
-            result
-        } else {
-            panic!("This should never happen")
+where T: DafnyType {
+    pub fn from_array(values: &Vec<T>) -> Sequence<T> {
+        Sequence::ArraySequence {
+            values: Rc::new(values.clone())
+        }
+    }
+    pub fn from_array_slice(values: &Vec<T>, start: &DafnyInt, end: &DafnyInt) -> Sequence<T> {
+        Sequence::ArraySequence {
+            values: Rc::new(values[start.to_usize().unwrap()..end.to_usize().unwrap()].to_vec())
+        }
+    }
+    pub fn from_array_take(values: &Vec<T>, n: &DafnyInt) -> Sequence<T> {
+        Sequence::ArraySequence {
+            values: Rc::new(values[..n.to_usize().unwrap()].to_vec())
+        }
+    }
+    pub fn from_array_drop(values: &Vec<T>, n: &DafnyInt) -> Sequence<T> {
+        Sequence::ArraySequence {
+            values: Rc::new(values[n.to_usize().unwrap()..].to_vec())
+        }
+    }
+    pub fn from_array_owned(values: Vec<T>) -> Sequence<T> {
+        Sequence::ArraySequence {
+            values: Rc::new(values),
+        }
+    }
+    pub fn new_concat_sequence(left: &Sequence<T>, right: &Sequence<T>) -> Sequence<T> {
+        Sequence::ConcatSequence {
+            left: Rc::new(UnsafeCell::new(left.clone())),
+            right: Rc::new(UnsafeCell::new(right.clone())),
+            length: left.cardinality_usize() + right.cardinality_usize(),
+            boxed: Rc::new(RefCell::new(None)),
+        }
+    }
+    pub fn to_array(&self) -> Rc<Vec<T>> {
+        // Let's convert the if then else below to a proper match statement
+        match self {
+            Sequence::ArraySequence { values, .. } =>
+              // The length of the elements
+              Rc::clone(values),
+            Sequence::ConcatSequence { length, boxed, left, right } => {
+                let clone_boxed = boxed.as_ref().clone();
+                let clone_boxed_borrowed = clone_boxed.borrow();
+                let borrowed: Option<&Rc<Vec<T>>> = clone_boxed_borrowed.as_ref();
+                if let Some(cache) = borrowed.as_ref() {
+                    return Rc::clone(cache);
+                }
+                // Let's create an array of size length and fill it up recursively
+                // We don't materialize nested arrays because most of the time they are forgotten
+                let mut array: Vec<T> = Vec::with_capacity(*length);
+                Sequence::<T>::append_recursive(&mut array, self);
+                let result = Rc::new(array);
+                let mut cache = boxed.borrow_mut();
+                let mutable_left: *mut Sequence<T> = left.get();
+                let mutable_right: *mut Sequence<T> = right.get();
+                unsafe { *mutable_left = seq!() };
+                unsafe { *mutable_right = seq!() };
+                *cache = Some(result.clone());
+                result
+            }
         }
     }
 
-    fn append_recursive(array: &mut Vec<T>, this: &Sequence<T>) {
+    pub fn append_recursive(array: &mut Vec<T>, this: &Sequence<T>) {
         match this {
             Sequence::ArraySequence { values, .. } =>
               // The length of the elements
               for value in values.iter() {
                 array.push(value.clone());
               },
-            Sequence::ConcatSequence { left, right, .. } =>
+            Sequence::ConcatSequence { boxed, left, right, .. } =>
               // Let's create an array of size length and fill it up recursively
               {
-                Sequence::<T>::append_recursive(array, left);
-                Sequence::<T>::append_recursive(array, right);
+                let clone_boxed = boxed.as_ref().clone();
+                let clone_boxed_borrowed = clone_boxed.borrow();
+                let borrowed: Option<&Rc<Vec<T>>> = clone_boxed_borrowed.as_ref();
+                if let Some(values) = borrowed.as_ref() {
+                    for value in values.iter() {
+                        array.push(value.clone());
+                    }
+                    return;
+                }
+                Sequence::<T>::append_recursive(array, unsafe { &mut *left.get() });
+                Sequence::<T>::append_recursive(array, unsafe { &mut *right.get() });
               }
-            Sequence::LazySequence { boxed, .. } =>
-            Sequence::<T>::append_recursive(array, boxed.borrow().as_ref()),
         }
     }
-
     /// Returns the cardinality of this [`Sequence<T>`].
     // The cardinality returns the length of the sequence
-    fn cardinality(&self) -> SizeT {
+    pub fn cardinality_usize(&self) -> SizeT {
         match self {
             Sequence::ArraySequence { values, .. } =>
               // The length of the elements
               values.len(),
             Sequence::ConcatSequence { length, .. } =>
               *length,
-            Sequence::LazySequence { length, .. } =>
-              *length,
         }
     }
-    fn select(&self, index: SizeT) -> T {
+    pub fn cardinality(&self) -> DafnyInt {
+        DafnyInt::from_usize(self.cardinality_usize())
+    }
+    pub fn select(&self, index: SizeT) -> T {
         let array = self.to_array();
         array[index].clone()
     }
-    
+
+    pub fn slice(&self, start: &DafnyInt, end: &DafnyInt) -> Sequence<T> {
+        let start_index = start.data.as_ref().to_usize().unwrap();
+        let end_index = end.data.as_ref().to_usize().unwrap();
+        let new_data = Sequence::from_array_owned(self.to_array()[start_index..end_index].to_vec());
+        new_data
+    }
+    pub fn take(&self, end: &DafnyInt) -> Sequence<T> {
+        let end_index = end.data.as_ref().to_usize().unwrap();
+        let new_data = Sequence::from_array_owned(self.to_array()[..end_index].to_vec());
+        new_data
+    }
+    pub fn drop(&self, start: &DafnyInt) -> Sequence<T> {
+        let start_index = start.data.as_ref().to_usize().unwrap();
+        let new_data = Sequence::from_array_owned(self.to_array()[start_index..].to_vec());
+        new_data
+   }
+
+    pub fn update_index(&self, index: &DafnyInt, value: &T) -> Self {
+        let mut result = self.to_array().as_ref().clone();
+        result[index.data.to_usize().unwrap()] = value.clone();
+        Sequence::from_array_owned(result)
+    }
+
+    pub fn concat(&self, other: &Sequence<T>) -> Sequence<T> {
+        Sequence::new_concat_sequence(self, other)
+    }
+
+    pub fn get(&self, index: &DafnyInt) -> T {
+        self.select(index.data.to_usize().unwrap())
+    }
+}
+
+impl <T: DafnyTypeEq> Sequence<T> {
+    pub fn as_dafny_multiset(&self) -> Multiset<T> {
+        Multiset::from_array(&self.to_array())
+    }
+}
+
+// Makes it possible to write iterator.collect::<Sequence<T>> and obtain a sequence
+impl <T: DafnyType> FromIterator<T> for Sequence<T> {
+    fn from_iter<I: IntoIterator<Item = T>>(iter: I) -> Self {
+        Sequence::from_array_owned(iter.into_iter().collect())
+    }
+}
+
+impl <T: DafnyTypeEq> Sequence<T> {
+    pub fn contains(&self, value: &T) -> bool {
+        self.to_array().contains(value)
+    }
+}
+impl <T> PartialEq<Sequence<T>> for Sequence<T>
+  where T: DafnyTypeEq
+{
+    fn eq(&self, other: &Sequence<T>) -> bool {
+        // Iterate through both elements and verify that they are equal
+        let values: Rc<Vec<T>> = self.to_array();
+        if other.cardinality_usize() != values.len() {
+            return false;
+        }
+        let mut i: usize = 0;
+        for value in values.iter() {
+            if value != &other.select(i) {
+                return false;
+            }
+            i += 1;
+        }
+        true
+    }
+}
+
+impl <T: DafnyTypeEq> PartialOrd for Sequence<T> {
+    fn partial_cmp(&self, other: &Sequence<T>) -> Option<Ordering> {
+        // Comparison is only prefix-based
+        match self.cardinality_usize().cmp(&other.cardinality_usize()) {
+            Ordering::Equal => {
+              if self == other { Some(Ordering::Equal) } else { None }
+            },
+            Ordering::Less => {
+                for i in 0..self.cardinality_usize() {
+                    if self.select(i) != other.select(i) {
+                        return None;
+                    }
+                }
+                Some(Ordering::Less)
+            },
+            Ordering::Greater => {
+                for i in 0..other.cardinality_usize() {
+                    if self.select(i) != other.select(i) {
+                        return None;
+                    }
+                }
+                Some(Ordering::Greater)
+            }
+        }
+    }
+}
+
+impl <V: DafnyType> DafnyPrint for Sequence<V>
+{
+    fn fmt_print(&self, f: &mut Formatter<'_>, _in_seq: bool) -> std::fmt::Result {
+        if !V::is_char() {
+            write!(f, "[")?;
+        }
+      let mut first = true;
+      for value in self.to_array().iter() {
+          if !first && !V::is_char() {
+            write!(f, ", ")?;
+          }
+          first = false;
+          value.fmt_print(f, true)?;
+      }
+      if !V::is_char() {
+        write!(f, "]")
+      } else {
+        write!(f, "")
+      }
+    }
+}
+
+impl <V: DafnyType> Debug for Sequence<V> {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        self.fmt_print(f, false)
+    }
 }
 
 // **************
 // Immutable maps
 // **************
 
-#[allow(dead_code)]
-struct Map<K, V> 
-  where K: Clone + Eq + std::hash::Hash, V: Clone
+#[derive(Clone)]
+pub struct Map<K, V>
+    where K: DafnyTypeEq, V: DafnyTypeEq
+{
+    data: Rc<HashMap<K, V>>
+}
+
+impl <K: DafnyTypeEq, V: DafnyTypeEq> Hash for Map<K, V>
+{
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.data.len().hash(state); // Worst performance for things that are not hashable like maps
+    }
+}
+
+impl <K, V> PartialEq<Map<K, V>> for Map<K, V>
+  where K: DafnyTypeEq, V: DafnyTypeEq
+{
+    fn eq(&self, other: &Map<K, V>) -> bool {
+        if self.data.len() != other.data.len() {
+            return false;
+        }
+        for (k, v) in self.data.iter() {
+            if other.data.get(k) != Some(v) {
+                return false;
+            }
+        }
+        return true;
+    }
+}
+
+impl <K: DafnyType, V: DafnyType> DafnyType for (K, V) {}
+impl <K: DafnyTypeEq, V: DafnyTypeEq> DafnyTypeEq for (K, V) {}
+
+impl <K: DafnyTypeEq, V: DafnyTypeEq> DafnyType for Map<K, V> {}
+impl <K: DafnyTypeEq, V: DafnyTypeEq> DafnyTypeEq for Map<K, V> {}
+
+impl <K: DafnyTypeEq, V: DafnyTypeEq> Eq for Map<K, V> {
+}
+
+impl <K: DafnyTypeEq, V: DafnyTypeEq> Map<K, V>
+{
+    pub fn new_empty() -> Map<K, V> {
+        Map {
+            data: Rc::new(HashMap::new())
+        }
+    }
+    pub fn from_array(values: &Vec<(K, V)>) -> Map<K, V> {
+        Self::from_iterator(values.iter().map(|(k, v)|
+            (k.clone(), v.clone())))
+    }
+    pub fn from_iterator<I>(data: I) -> Map<K, V>
+        where I: Iterator<Item=(K, V)>
+    {
+        let mut result: HashMap<K, V> = HashMap::new();
+        for (k, v) in data {
+            result.insert(k, v);
+         }
+         Self::from_hashmap_owned(result)
+    }
+    pub fn from_hashmap_owned(values: HashMap<K, V>) -> Map<K, V> {
+        Map { data: Rc::new(values) }
+    }
+    pub fn to_hashmap_owned<K2, V2>(&self, converter_k: fn(&K)->K2, converter_v: fn(&V)->V2) -> HashMap<K2, V2>
+      where K2: Eq + std::hash::Hash, V2: Clone
+    {
+        let mut result: HashMap<K2, V2> = HashMap::new();
+        for (k, v) in self.data.iter() {
+            result.insert(converter_k(k), converter_v(v));
+        }
+        result
+    }
+    pub fn cardinality_usize(&self) -> usize {
+        self.data.len()
+    }
+    pub fn cardinality(&self) -> DafnyInt {
+        DafnyInt::from_usize(self.cardinality_usize())
+    }
+    pub fn contains(&self, key: &K) -> bool {
+        self.data.contains_key(key)
+    }
+    pub fn get_or_none(&self, key: &K) -> Option<V> {
+        self.data.get(key).cloned()
+    }
+    // Dafny will normally guarantee that the key exists.
+    pub fn get(&self, key: &K) -> V {
+        self.data[key].clone()
+    }
+    pub fn merge(&self, other: &Map<K, V>) -> Map<K, V> {
+        if other.cardinality_usize() == 0 {
+            return self.clone();
+        }
+        if self.cardinality_usize() == 0 {
+            return other.clone();
+        }
+        let mut new_data = (*other.data).clone();
+        // Overriding self's keys with other's keys if there are some.
+        for (k, v) in self.data.iter() {
+            if !other.contains(k) {
+                new_data.insert(k.clone(), v.clone());
+            }
+        }
+        Self::from_hashmap_owned(new_data)
+    }
+    pub fn subtract(&self, keys: &Set<K>) -> Self {
+        if keys.cardinality_usize() == 0 {
+            return self.clone()
+        }
+        let mut result: HashMap<K, V> = HashMap::new();
+        for (k, v) in self.data.iter() {
+            if !keys.contains(k) {
+                result.insert(k.clone(), v.clone());
+            }
+        }
+        Self::from_hashmap_owned(result)
+    }
+
+    pub fn from_hashmap<K2, V2>(map: &HashMap<K2, V2>, converter_k: fn(&K2)->K, converter_v: fn(&V2)->V)
+        -> Map<K, V>
+      where
+        K: DafnyTypeEq, V: DafnyTypeEq,
+        K2: Eq + Hash, V2: Clone
+    {
+        let mut result: HashMap<K, V> = HashMap::new();
+        for (k, v) in map.iter() {
+            result.insert(converter_k(k), converter_v(v));
+        }
+        Map {
+            data: Rc::new(result)
+        }
+    }
+    pub fn keys(&self) -> Set<K> {
+        let mut result: HashSet<K> = HashSet::new();
+        for (k, _) in self.data.iter() {
+            result.insert(k.clone());
+        }
+        Set::from_hashset_owned(result)
+    }
+    pub fn values(&self) -> Set<V> {
+        let mut result: Vec<V> = Vec::new();
+        for (_, v) in self.data.iter() {
+            result.push(v.clone());
+        }
+        Set::from_array(&result)
+    }
+
+    pub fn update_index(&self, index: &K, value: &V) -> Self {
+        let mut result = self.data.as_ref().clone();
+        result.insert(index.clone(), value.clone());
+        Map::from_hashmap_owned(result)
+    }
+
+    pub fn update_index_owned(&self, index: K, value: V) -> Self {
+        let mut result = self.data.as_ref().clone();
+        result.insert(index, value);
+        Map::from_hashmap_owned(result)
+    }
+}
+
+impl <K: DafnyTypeEq> Map<K, DafnyInt> {
+    pub fn as_dafny_multiset(&self) -> Multiset<K> {
+        Multiset::from_hashmap(&self.data)
+    }
+}
+
+pub struct MapBuilder<K, V>
+  where K: Clone + Eq + std::hash::Hash, V: Clone
+{
+    data: HashMap<K, V>
+}
+
+impl <K, V> MapBuilder<K, V>
+  where K: DafnyTypeEq, V: DafnyTypeEq
+{
+    pub fn new() -> MapBuilder<K, V> {
+        MapBuilder {
+            data: HashMap::new()
+        }
+    }
+    pub fn add(&mut self, key: &K, value: &V) {
+        // Dafny will prove that overriding has the same value anyway
+        self.data.insert(key.clone(), value.clone());
+    }
+    pub fn build(self) -> Map<K, V> {
+        Map::from_hashmap_owned(self.data)
+    }
+}
+
+impl <K, V> DafnyPrint for Map<K, V>
+  where K: DafnyTypeEq, V: DafnyTypeEq
+{
+    fn fmt_print(&self, f: &mut Formatter<'_>, in_seq: bool) -> std::fmt::Result {
+        f.write_str("map[")?;
+      let mut first = true;
+      for (k, v) in self.data.iter() {
+          if !first {
+              f.write_str(", ")?;
+          }
+          first = false;
+          k.fmt_print(f, in_seq)?;
+          f.write_str(" := ")?;
+          v.fmt_print(f, in_seq)?;
+      }
+      f.write_str("}")
+    
+    }
+}
+
+
+impl <K, V> Debug for Map<K, V>
+  where K: DafnyTypeEq, V: DafnyTypeEq
+{
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        self.fmt_print(f, false)
+    }
+}
+
+// **************
+// Immutable sets
+// **************
+
+#[derive(Clone)]
+pub struct Set<V: DafnyTypeEq>
+{
+    data: Rc<HashSet<V>>
+}
+
+impl <V> PartialEq<Set<V>> for Set<V>
+  where V: DafnyTypeEq
+{
+    fn eq(&self, other: &Set<V>) -> bool {
+        // 1. Same cardinality
+        // 2. All the elements of self are in the other
+        if self.cardinality_usize() != other.cardinality_usize() {
+            false
+        } else {
+            for value in self.data.iter() {
+                if !other.contains(value) {
+                    return false;
+                }
+            }
+            for value in other.data.iter() {
+                if !self.contains(value) {
+                    return false;
+                }
+            }
+            true
+        }
+    }
+}
+
+impl <T: DafnyTypeEq> PartialOrd for Set<T> {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        // Partial ordering is inclusion
+        if self.cardinality_usize() <= other.cardinality_usize() {
+            for value in self.data.iter() {
+                if !other.contains(value) {
+                    return None;
+                }
+            }
+            if self.cardinality_usize() == other.cardinality_usize() {
+                Some(Ordering::Equal)
+            } else {
+                Some(Ordering::Less)
+            }
+        } else {
+            for value in other.data.iter() {
+                if !self.contains(value) {
+                    return None;
+                }
+            }
+            Some(Ordering::Greater)
+        }
+    }
+}
+
+impl <V: DafnyTypeEq> Set<V> {
+    pub fn new_empty() -> Set<V> {
+        Self::from_hashset_owned(HashSet::new())
+    }
+    pub fn from_array(array: &Vec<V>) -> Set<V> {
+        Self::from_iterator(array.iter().map(|v| v.clone()))
+    }
+    pub fn from_iterator<I>(data: I) -> Set<V>
+      where I: Iterator<Item=V>
+    {
+        let mut set: HashSet<V> = HashSet::new();
+        for value in data {
+            set.insert(value);
+        }
+        Self::from_hashset_owned(set)
+    }
+    pub fn from_sequence(data: &Rc<Sequence<V>>) -> Set<V> {
+        Self::from_array(data.to_array().borrow())
+    }
+    pub fn from_hashset_owned(hashset: HashSet<V>) -> Set<V> {
+        Set {
+            data: Rc::new(hashset)
+        }
+    }
+}
+
+impl <V: DafnyTypeEq> Set<V>
+{
+    pub fn cardinality_usize(&self) -> usize {
+        self.data.len()
+    }
+    pub fn cardinality(&self) -> DafnyInt {
+        DafnyInt::from_usize(self.data.len())
+    }
+    pub fn contains(&self, value: &V) -> bool {
+        self.data.contains(value)
+    }
+    pub fn merge(self: &Self, other: &Set<V>) -> Set<V> {
+        if self.cardinality_usize() == 0 {
+            return other.clone();
+        }
+        if other.cardinality_usize() == 0 {
+            return self.clone();
+        }
+        let mut result = self.data.as_ref().clone();
+        // iterate over the other, add only not contained elements
+        for value in other.data.iter() {
+            if !result.contains(value) {
+                result.insert(value.clone());
+            }
+        }
+        Set::from_hashset_owned(result)
+    }
+
+    pub fn intersect(self: &Self, other: &Set<V>) -> Set<V> {
+        if self.cardinality_usize() == 0 {
+            return self.clone();
+        }
+        if other.cardinality_usize() == 0 {
+            return other.clone();
+        }
+        // Start with an empty vec with capacity the smallest of both sets
+        let mut result = HashSet::new();
+          
+        // iterate over the other, take only elements in common
+        for value in self.data.iter() {
+            if other.data.contains(value) {
+                result.insert(value.clone());
+            }
+        }
+        Set::from_hashset_owned(result)
+    }
+
+    pub fn subtract(&self, other: &Set<V>) -> Set<V> {
+        if self.cardinality_usize() == 0 {
+            return self.clone();
+        }
+        if other.cardinality_usize() == 0 {
+            return self.clone();
+        }
+        // Start with a vec the size of the first one
+        let mut result = HashSet::new();
+          
+        // iterate over the other, take only elements not in second
+        for value in self.data.iter() {
+            if !other.contains(value) {
+                result.insert(value.clone());
+            }
+        }
+        Set::from_hashset_owned(result)
+    }
+
+    pub fn disjoint(&self, other: &Set<V>) -> bool {
+        if self.cardinality_usize() == 0 {
+            return true;
+        }
+        if other.cardinality_usize() == 0 {
+            return true;
+        }
+        if other.data.len() < self.data.len() {
+            // iterate over the other, take only elements not in self
+            for value in other.data.iter() {
+                if self.contains(value) {
+                    return false;
+                }
+            }
+        } else {
+            // iterate over the self, take only elements not in other
+            for value in self.data.iter() {
+                if other.contains(value) {
+                    return false;
+                }
+            }
+        }
+        true
+    }
+
+    pub fn equals(&self, other: &Set<V>) -> bool {
+        if self.cardinality_usize() != other.cardinality_usize() {
+            return false;
+        }
+        // iterate over the other, take only elements not in second
+        for value in other.data.iter() {
+            if !self.contains(value) {
+                return false;
+            }
+        }
+        true
+    }
+
+    pub fn elements(self: &Self) -> Set<V> {
+        self.clone()
+    }
+
+    pub fn as_dafny_multiset(&self) -> Multiset<V> {
+        Multiset::from_set(self)
+    }
+}
+
+pub struct SetBuilder<T>
+  where T: Clone + Eq + std::hash::Hash
+{
+    data: HashMap<T, bool>
+}
+
+impl <T: DafnyTypeEq> SetBuilder<T>
+{
+    pub fn new() -> SetBuilder<T> {
+        SetBuilder {
+            data: HashMap::new()
+        }
+    }
+    pub fn add(&mut self, value: &T) {
+        // Dafny will prove that overriding has the same value anyway
+        self.data.insert(value.clone(), true);
+    }
+    pub fn build(self) -> Set<T> {
+        // Iterate over all the key values of the hashmap and add them to an array
+        let mut result: Vec<T> = Vec::new();
+        for (k, _v) in self.data.iter() {
+            result.push(k.clone());
+        }
+        
+        Set::from_array(&result)
+    }
+}
+
+impl <V: DafnyTypeEq> DafnyPrint for Set<V>
+{
+    fn fmt_print(&self, f: &mut Formatter<'_>, in_seq: bool) -> std::fmt::Result {
+        f.write_str("{")?;
+        let mut first = true;
+        for value in self.data.iter() {
+            if !first {
+                f.write_str(", ")?;
+            }
+            first = false;
+            value.fmt_print(f, in_seq)?;
+        }
+        f.write_str("}")
+    }
+}
+
+impl <V> Debug for Set<V>
+  where V: DafnyTypeEq
+{
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        self.fmt_print(f, false)
+    }
+}
+
+// *******************
+// Immutable multisets
+// *******************
+
+#[derive(Clone)]
+pub struct Multiset<V: DafnyTypeEq>
+{
+    pub data: HashMap<V, DafnyInt>,
+    pub size: DafnyInt
+}
+
+impl <V: DafnyTypeEq> Multiset<V>
+{
+    pub fn new_empty() -> Multiset<V> {
+        Self::from_array(&vec!())
+    }
+    pub fn get_total(map: &HashMap<V, DafnyInt>) -> DafnyInt {
+        let mut total = DafnyInt::zero();
+        for (_, v) in map.iter() {
+            total = total + v.clone();
+        }
+        total
+    }
+    pub fn from_hashmap_owned(map: HashMap<V, DafnyInt>) -> Multiset<V>{
+        Multiset {
+            size: Self::get_total(&map),
+            data: map
+        }
+    }
+    pub fn from_hashmap(map: &HashMap<V, DafnyInt>) -> Multiset<V>{
+        Self::from_hashmap_owned(map.clone())
+    }
+    pub fn from_array(data: &Vec<V>) -> Multiset<V> {
+        Self::from_iterator(data.iter().map(|x| x.clone()))
+    }
+    pub fn from_iterator<I>(data: I) -> Multiset<V>
+      where I: Iterator<Item=V>
+    {
+        let mut hashmap: HashMap<V, DafnyInt> = HashMap::new();
+        let mut total: DafnyInt = DafnyInt::zero();
+        for value in data {
+            let count = hashmap.entry(value.clone()).or_insert(DafnyInt::zero());
+            *count = count.clone() + DafnyInt::one();
+            total = total + DafnyInt::one();
+        }
+        Multiset {
+            data: hashmap,
+            size: total
+        }
+    }
+    pub fn from_set(set: &Set<V>) -> Multiset<V> {
+        Self::from_iterator(set.data.iter().map(|v| v.clone()))
+    }
+
+    pub fn cardinality_usize(&self) -> SizeT {
+        self.size.data.to_usize().unwrap()
+    }
+    pub fn cardinality(&self) -> DafnyInt {
+        self.size.clone()
+    }
+    pub fn contains(&self, value: &V) -> bool {
+        self.data.contains_key(value) && self.data.get(value).unwrap() > &DafnyInt::zero()
+    }
+    pub fn get(&self, value: &V) -> DafnyInt {
+        if self.data.contains_key(value) {
+            self.data.get(value).unwrap().clone()
+        } else {
+            DafnyInt::zero()
+        }
+    }
+    pub fn update_count(&self, value: &V, new_count: &DafnyInt) -> Multiset<V> {
+        let mut result = self.clone();
+        let old_count = self.get(value);
+        if new_count == &DafnyInt::zero() {
+            result.data.remove(value);
+        } else {
+            result.data.insert(value.clone(), new_count.clone());
+        }
+        result.size = self.size.clone() + new_count.clone() - old_count;
+        result
+    }
+    pub fn merge(&self, other: &Multiset<V>) -> Multiset<V> {
+        if other.size.is_zero() {
+            return self.clone();
+        }
+        if self.size.is_zero() {
+            return other.clone()
+        }
+        let mut result = self.data.clone();
+        for (k, v) in other.data.iter() {
+            let old_count = self.get(k);
+            let new_count = old_count.clone() + v.clone();
+            result.insert(k.clone(), new_count);
+        }
+        Multiset { data: result, size: self.size.clone() + other.size.clone() }
+    }
+    pub fn intersect(&self, other: &Multiset<V>) -> Multiset<V> {
+        if other.size.is_zero() {
+            return other.clone()
+        }
+        if self.size.is_zero() {
+            return self.clone()
+        }
+        let mut result = HashMap::<V, DafnyInt>::new();
+        let mut total = DafnyInt::zero();
+        for (k, other_count) in other.data.iter() {
+            let self_count = self.get(k);
+            let resulting_count = if self_count < *other_count {
+                self_count
+            } else {
+                other_count.clone()
+            };
+            if resulting_count.is_positive() {
+                result.insert(k.clone(), resulting_count.clone());
+                total = total + resulting_count;
+            }
+        }
+        Multiset { data: result, size: total }
+    }
+    pub fn subtract(&self, other: &Multiset<V>) -> Multiset<V> {
+        if other.size.is_zero() {
+            return self.clone();
+        }
+        if self.size.is_zero() {
+            return self.clone();
+        }
+        let mut result = self.data.clone();
+        let mut total = self.size.clone();
+        for (k, v) in other.data.iter() {
+            let old_count = self.get(k);
+            let new_count = old_count.clone() - v.clone();
+            if !new_count.is_positive() {
+                total = total - old_count.clone();
+                result.remove(k);
+            } else {
+                total = total - v.clone();
+                result.insert(k.clone(), new_count);
+            }
+        }
+        Multiset { data: result, size: total }
+    }
+    pub fn disjoint(&self, other: &Multiset<V>) -> bool {
+        for value in other.data.keys() {
+            if self.contains(value) {
+                return false;
+            }
+        }
+        true
+    }
+
+    pub fn as_dafny_multiset(&self) -> Multiset<V> {
+        self.clone()
+    }
+}
+
+impl <V: DafnyTypeEq> DafnyType for Multiset<V> {}
+impl <V: DafnyTypeEq> DafnyTypeEq for Multiset<V> {}
+
+impl <V: DafnyTypeEq> PartialOrd<Multiset<V>> for Multiset<V> {
+    fn partial_cmp(&self, other: &Multiset<V>) -> Option<Ordering> {
+        match self.cardinality().cmp(&other.cardinality()) {
+            Ordering::Less => {
+                for value in other.data.keys() {
+                    if !self.contains(value) || self.get(value) > other.get(value) {
+                        return None;
+                    }
+                }
+                Some(Ordering::Less)
+            }
+            Ordering::Equal => {
+                for value in self.data.keys() {
+                    if self.get(value) != other.get(value) {
+                        return None;
+                    }
+                }
+                Some(Ordering::Equal)
+            },
+            Ordering::Greater => {
+                for value in self.data.keys() {
+                    if !other.contains(value) || self.get(value) < other.get(value) {
+                        return None;
+                    }
+                }
+                Some(Ordering::Greater)
+            }
+        }
+    }
+}
+
+impl <V: DafnyTypeEq> DafnyPrint for Multiset<V> {
+    fn fmt_print(&self, f: &mut Formatter<'_>, in_seq: bool) -> std::fmt::Result {
+        f.write_str("multiset{")?;
+        let mut first = true;
+        for value in self.data.iter() {
+            for _count in 0..value.1.data.to_usize().unwrap() {
+                if !first {
+                    f.write_str(", ")?;
+                }
+                first = false;
+                value.0.fmt_print(f, in_seq)?;
+            }
+        }
+        f.write_str("}")
+    }
+}
+
+
+impl <V> Debug for Multiset<V>
+  where V: DafnyTypeEq
 {
-    data: Rc<Sequence<(K, V)>>,
-    // Any time we explicitly access this map, we index the data
-    cache: RefCell<Option<HashMap<K, V>>>
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        self.fmt_print(f, false)
+    }
 }
 
-#[allow(dead_code)]
-impl <K, V> Map<K, V>
-  where K: Clone + Eq + std::hash::Hash, V: Clone
-{
-    fn new_empty() -> Rc<Map<K, V>> {
-        Rc::new(Map {
-            data: Sequence::new_array_sequence(&Rc::new(Vec::new())),
-            cache: RefCell::new(None)
-        })
-    }
-    fn new_from_sequence(data: &Rc<Sequence<(K, V)>>) -> Rc<Map<K, V>> {
-        Rc::new(Map {
-            data: Rc::clone(data),
-            cache: RefCell::new(None)
-        })
-    }
-    fn to_hashmap_owned<K2, V2>(&self, converter_k: fn(&K)->K2, converter_v: fn(&V)->V2) -> HashMap<K2, V2>
-      where K2: Eq + std::hash::Hash, V2: Clone
-    {
-        let mut result: HashMap<K2, V2> = HashMap::new();
-        for (k, v) in self.data.to_array().iter() {
-            result.insert(converter_k(k), converter_v(v));
+impl <V: DafnyTypeEq> PartialEq<Multiset<V>> for Multiset<V> {
+    fn eq(&self, other: &Multiset<V>) -> bool {
+        if self.cardinality() != other.cardinality() {
+            return false;
         }
-        result
-    }
-    fn compute_hashmap(&self) {
-        let mut cache = self.cache.borrow_mut();
-        if cache.is_none() {
-            *cache = Some(self.to_hashmap_owned(
-                |x| x.clone(),
-                |x| x.clone()
-            ));
+        // iterate over the other, take only elements not in second
+        for value in other.data.iter() {
+            if !self.contains(value.0) || self.get(value.0) != *value.1 {
+                return false;
+            }
         }
+        true
     }
-    // Dafny will normally guarantee that the key exists.
-    fn get(&self, key: &K) -> V {
-        self.compute_hashmap();
-        self.cache.borrow_mut().as_ref().unwrap().get(key).unwrap().clone()
-    }
-    fn add(&self, key: K, value: V) -> Rc<Map<K, V>> {
-        let new_data = Sequence::<(K, V)>::new_array_sequence(
-            &Rc::new(vec![(key, value)]));
-        let combined_data = Sequence::<(K, V)>::new_concat_sequence(
-            &self.data, &new_data);
-        Rc::new(Map {
-            data: combined_data,
-            cache: RefCell::new(None)
-        })
-    }
-    fn add_multiple(&self, other: &Rc<Map<K, V>>) -> Rc<Map<K, V>> {
-        let new_data = Rc::clone(&other.data);
-        let combined_data = Sequence::<(K, V)>::new_concat_sequence(
-            &self.data, &new_data);
-        Rc::new(Map {
-            data: combined_data,
-            cache: RefCell::new(None)
-        })
-    
+}
+impl <V: DafnyTypeEq> Eq for Multiset<V> {}
+impl <V: DafnyTypeEq> Hash for Multiset<V> {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.cardinality().hash(state);
     }
-    // TODO: Remaining methods + check names
 }
 
 // Generic function to allocate and return a raw pointer immediately
 #[inline]
-pub fn allocate<T>(value: Box<T>) -> *const T {
+pub fn allocate<T: ?Sized>(value: Box<T>) -> *const T {
     Box::into_raw(value)
 }
 
@@ -311,10 +1371,50 @@ pub fn deallocate<T : ?Sized>(pointer: *const T) {
         let _ = Box::from_raw(pointer as *mut T);
     }
 }
-
-pub fn is_instance_of<T: ?Sized + Any, U: 'static>(theobject: *const T) -> bool {
+// Define the AsAny trait
+pub trait AsAny {
+  fn as_any(&self) -> &dyn Any;
+}
+pub fn is_instance_of<C: ?Sized + AsAny, U: 'static>(theobject: *const C) -> bool {
     unsafe { &*theobject }.as_any().downcast_ref::<U>().is_some()
 }
+trait DafnyUpdowncast<U: ?Sized> {
+    fn updowncast(&self) -> U;
+    fn is_instance_of(&self) -> bool;
+}
+/*impl <T: ?Sized + AsAny, U: 'static> DafnyUpdowncast<*const U> for T
+{
+    fn updowncast(&self) -> *const U {
+        self.as_any().downcast_ref::<U>().unwrap()
+    }
+
+    fn is_instance_of(&self) -> bool {
+        is_instance_of::<T, U>(self)
+        //self.as_any().downcast_ref::<U>().is_some()
+    }
+}*/
+impl <T: ?Sized + AsAny, U: 'static> DafnyUpdowncast<*const U> for *const T
+{
+    fn updowncast(&self) -> *const U {
+        unsafe { &**self }.as_any().downcast_ref::<U>().unwrap()
+    }
+
+    fn is_instance_of(&self) -> bool {
+        is_instance_of::<T, U>(*self)
+        //self.as_any().downcast_ref::<U>().is_some()
+    }
+}
+impl <T: ?Sized + AsAny, U: 'static> DafnyUpdowncast<*const U> for Rc<T>
+{
+    fn updowncast(&self) -> *const U {
+        self.as_any().downcast_ref::<U>().unwrap()
+    }
+
+    fn is_instance_of(&self) -> bool {
+        is_instance_of::<T, U>(self.as_ref())
+        //self.as_any().downcast_ref::<U>().is_some()
+    }
+}
 
 pub fn dafny_rational_to_int(r: &BigRational) -> BigInt {
     euclidian_division(r.numer().clone(), r.denom().clone())
@@ -372,7 +1472,7 @@ pub struct IntegerRange<A: Add<Output = A> + One + Ord + Clone> {
 impl <A: Add<Output = A> + One + Ord + Clone> Iterator for IntegerRange<A> {
     type Item = A;
 
-    fn next(&mut self) -> Option<Self::Item> {
+        fn next(&mut self) -> Option<Self::Item> {
         if self.current < self.hi {
             let result = self.current.clone();
             self.current = self.current.clone() + One::one();
@@ -423,28 +1523,6 @@ impl <A: Clone> Clone for FunctionWrapper<A> {
     }
 }
 
-impl <A> DafnyErasable for FunctionWrapper<A> {
-    type Erased = FunctionWrapper<A>;
-
-    fn erase(&self) -> &Self::Erased {
-        self
-    }
-
-    fn erase_owned(self) -> Self::Erased {
-        self
-    }
-}
-
-impl <A> DafnyUnerasable<FunctionWrapper<A>> for FunctionWrapper<A> {
-    fn unerase(v: &FunctionWrapper<A>) -> &Self {
-        v
-    }
-
-    fn unerase_owned(v: FunctionWrapper<A>) -> Self {
-        v
-    }
-}
-
 impl <A: ?Sized> PartialEq for FunctionWrapper<Rc<A>> {
     fn eq(&self, other: &Self) -> bool {
         Rc::ptr_eq(&self.0, &other.0)
@@ -458,224 +1536,9 @@ impl <T: DafnyPrint> Display for DafnyPrintWrapper<&T> {
     }
 }
 
-pub trait DafnyErasable: DafnyUnerasable<Self::Erased>
-where Self: Sized {
-    type Erased;
-
-    fn erase(&self) -> &Self::Erased {
-        unsafe { &*(self as *const Self as *const Self::Erased) }
-    }
-
-    fn erase_owned(self) -> Self::Erased {
-        unsafe { transmute_unchecked(self) }
-    }
-}
-
-pub trait DafnyUnerasable<T>
-where Self: Sized {
-    fn unerase(v: &T) -> &Self {
-        unsafe { &*(v as *const T as *const Self) }
-    }
-
-    fn unerase_owned(v: T) -> Self {
-        unsafe { transmute_unchecked(v) }
-    }
-}
-
-impl <T: DafnyErasable> DafnyErasable for Option<T> {
-    type Erased = Option<T::Erased>;
-
-    #[inline]
-    fn erase(&self) -> &Self::Erased {
-        unsafe { &*(self as *const Self as *const Self::Erased) }
-    }
-
-    #[inline]
-    fn erase_owned(self) -> Self::Erased {
-        unsafe { transmute_unchecked(self) }
-    }
-}
-
-impl <T: DafnyUnerasable<U>, U> DafnyUnerasable<Option<U>> for Option<T> {
-    #[inline]
-    fn unerase(v: &Option<U>) -> &Self {
-        unsafe { &*(v as *const Option<U> as *const Self) }
-    }
-
-    #[inline]
-    fn unerase_owned(v: Option<U>) -> Self {
-        unsafe { transmute_unchecked(v) }
-    }
-}
-
-impl <T: DafnyErasable> DafnyErasable for Rc<T> {
-    type Erased = Rc<T::Erased>;
-
-    #[inline]
-    fn erase(&self) -> &Self::Erased {
-        unsafe { &*(self as *const Self as *const Self::Erased) }
-    }
-
-    #[inline]
-    fn erase_owned(self) -> Self::Erased {
-        unsafe { transmute_unchecked(self) }
-    }
-}
-
-impl <T: DafnyUnerasable<U>, U> DafnyUnerasable<Rc<U>> for Rc<T> {
-    #[inline]
-    fn unerase(v: &Rc<U>) -> &Self {
-        unsafe { &*(v as *const Rc<U> as *const Self) }
-    }
-
-    #[inline]
-    fn unerase_owned(v: Rc<U>) -> Self {
-        unsafe { transmute_unchecked(v) }
-    }
-}
-
-impl <T: DafnyErasable> DafnyErasable for Vec<T> {
-    type Erased = Vec<T::Erased>;
-}
-
-impl <T: DafnyUnerasable<U>, U> DafnyUnerasable<Vec<U>> for Vec<T> {}
-
-impl <T> DafnyErasable for HashSet<T> {
-    type Erased = HashSet<T>;
-
-    #[inline]
-    fn erase(&self) -> &Self::Erased {
-        self
-    }
-
-    #[inline]
-    fn erase_owned(self) -> Self::Erased {
-        self
-    }
-}
-
-impl <T> DafnyUnerasable<HashSet<T>> for HashSet<T> {
-    #[inline]
-    fn unerase(v: &HashSet<T>) -> &Self {
-        v
-    }
-
-    #[inline]
-    fn unerase_owned(v: HashSet<T>) -> Self {
-        v
-    }
-}
-
-impl <K, V> DafnyErasable for HashMap<K, V> {
-    type Erased = HashMap<K, V>;
-
-    #[inline]
-    fn erase(&self) -> &Self::Erased {
-        self
-    }
-
-    #[inline]
-    fn erase_owned(self) -> Self::Erased {
-        self
-    }
-}
-
-impl <K, V> DafnyUnerasable<HashMap<K, V>> for HashMap<K, V> {
-    #[inline]
-    fn unerase(v: &HashMap<K, V>) -> &Self {
-        v
-    }
-
-    #[inline]
-    fn unerase_owned(v: HashMap<K, V>) -> Self {
-        v
-    }
-}
-
-impl <T> DafnyErasable for Box<T> {
-    type Erased = Box<T>;
-
-    #[inline]
-    fn erase(&self) -> &Self::Erased {
-        self
-    }
-
-    #[inline]
-    fn erase_owned(self) -> Self::Erased {
-        self
-    }
-}
-
-impl <T> DafnyUnerasable<Box<T>> for Box<T> {
-    #[inline]
-    fn unerase(v: &Box<T>) -> &Self {
-        v
-    }
-
-    #[inline]
-    fn unerase_owned(v: Box<T>) -> Self {
-        v
-    }
-}
-
-impl <T: DafnyErasable> DafnyErasable for RefCell<T> {
-    type Erased = RefCell<T::Erased>;
-}
-
-impl <T: DafnyUnerasable<U>, U> DafnyUnerasable<RefCell<U>> for RefCell<T> {}
-
-macro_rules! impl_already_erased {
-    ($name:ty) => {
-        impl DafnyErasable for $name {
-            type Erased = $name;
-
-            #[inline]
-            fn erase(&self) -> &Self::Erased {
-                self
-            }
-
-            #[inline]
-            fn erase_owned(self) -> Self::Erased {
-                self
-            }
-        }
-
-        impl DafnyUnerasable<$name> for $name {
-            #[inline]
-            fn unerase(v: &$name) -> &Self {
-                v
-            }
-        
-            #[inline]
-            fn unerase_owned(v: $name) -> Self {
-                v
-            }
-        }
-    };
-}
-
-impl_already_erased! { String }
-impl_already_erased! { char }
-impl_already_erased! { bool }
-impl_already_erased! { u8 }
-impl_already_erased! { u16 }
-impl_already_erased! { u32 }
-impl_already_erased! { u64 }
-impl_already_erased! { u128 }
-impl_already_erased! { i8 }
-impl_already_erased! { i16 }
-impl_already_erased! { i32 }
-impl_already_erased! { i64 }
-impl_already_erased! { i128 }
-impl_already_erased! { f32 }
-impl_already_erased! { f64 }
-impl_already_erased! { () }
-impl_already_erased! { BigInt }
-impl_already_erased! { BigRational }
-
 // from gazebo
 #[inline]
-unsafe fn transmute_unchecked<A, B>(x: A) -> B {
+pub unsafe fn transmute_unchecked<A, B>(x: A) -> B {
     assert_eq!(std::mem::size_of::<A>(), std::mem::size_of::<B>());
     debug_assert_eq!(0, (&x as *const A).align_offset(std::mem::align_of::<B>()));
     let b = std::ptr::read(&x as *const A as *const B);
@@ -683,58 +1546,6 @@ unsafe fn transmute_unchecked<A, B>(x: A) -> B {
     b
 }
 
-macro_rules! impl_tuple_erased {
-    ($($items:ident)*) => {
-        impl <$($items,)*> DafnyErasable for ($($items,)*)
-        where
-            $($items: DafnyErasable,)*
-        {
-            type Erased = ($($items::Erased,)*);
-
-            #[inline]
-            fn erase(&self) -> &Self::Erased {
-                unsafe { &*(self as *const Self as *const Self::Erased) }
-            }
-
-            #[inline]
-            fn erase_owned(self) -> Self::Erased {
-                unsafe { transmute_unchecked(self) }
-            }
-        }
-
-        paste::item! {
-            impl <$([<T $items>],)* $($items: DafnyUnerasable<[<T $items>]>,)*> DafnyUnerasable<($([<T $items>],)*)> for ($($items,)*)
-            {
-                #[inline]
-                fn unerase(v: &($([<T $items>],)*)) -> &Self {
-                    unsafe { &*(v as *const ($([<T $items>],)*) as *const Self) }
-                }
-
-                #[inline]
-                fn unerase_owned(v: ($([<T $items>],)*)) -> Self {
-                    unsafe { transmute_unchecked(v) }
-                }
-            }
-        }
-    };
-}
-
-macro_rules! impl_tuple_erased_loop {
-    () => {};
-    ($first:ident $($rest:ident)*) => {
-        impl_tuple_erased_loop! { $($rest)* }
-        impl_tuple_erased! { $first $($rest)* }
-    };
-}
-
-// 32 elements ought to be enough for everyone
-impl_tuple_erased_loop! {
-    A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10
-    A11 A12 A13 A14 A15 A16 A17 A18 A19 A20
-    A21 A22 A23 A24 A25 A26 A27 A28 A29 A30
-    A31
-}
-
 pub trait DafnyPrint {
     fn fmt_print(&self, f: &mut Formatter<'_>, in_seq: bool) -> std::fmt::Result;
 
@@ -755,9 +1566,11 @@ macro_rules! impl_print_display {
     ($name:ty) => {
         impl DafnyPrint for $name {
             fn fmt_print(&self, f: &mut Formatter<'_>, _in_seq: bool) -> std::fmt::Result {
-                self.fmt(f)
+                std::fmt::Display::fmt(&self, f)
             }
         }
+        impl DafnyType for $name {}
+        impl DafnyTypeEq for $name {}
     };
 }
 
@@ -774,6 +1587,7 @@ impl_print_display! { i16 }
 impl_print_display! { i32 }
 impl_print_display! { i64 }
 impl_print_display! { i128 }
+impl_print_display! { usize }
 
 impl DafnyPrint for f32 {
     fn fmt_print(&self, f: &mut Formatter<'_>, _in_seq: bool) -> std::fmt::Result {
@@ -793,13 +1607,76 @@ impl DafnyPrint for () {
     }
 }
 
-impl DafnyPrint for char {
+#[derive(Clone)]
+pub struct DafnyCharUTF16(pub u16);
+impl DafnyType for DafnyCharUTF16 {}
+impl DafnyTypeEq for DafnyCharUTF16 {}
+
+
+impl DafnyPrint for DafnyCharUTF16 {
+    #[inline]
+    fn fmt_print(&self, f: &mut Formatter<'_>, in_seq: bool) -> std::fmt::Result {
+        let real_char = char::decode_utf16(vec!(self.clone()).iter().map(|v| v.0))
+        .map(|r| r.map_err(|e| e.unpaired_surrogate()))
+        .collect::<Vec<_>>()[0];
+        let rendered_char = match real_char {
+            Ok(c) => c,
+            Err(e) => {
+                return write!(f, "Invalid UTF-16 code point: {}", e);
+            }
+        };
+
+        if in_seq {
+            write!(f, "{}", rendered_char)
+        } else {
+            write!(f, "'{}'", rendered_char)
+        }
+    }
+
+    #[inline]
+    fn is_char() -> bool {
+        true
+    }
+}
+
+impl Debug for DafnyCharUTF16
+{
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        self.fmt_print(f, false)
+    }
+}
+
+impl PartialEq<DafnyCharUTF16> for DafnyCharUTF16 {
+    fn eq(&self, other: &DafnyCharUTF16) -> bool {
+        self.0 == other.0
+    }
+}
+impl Eq for DafnyCharUTF16 {}
+impl Hash for DafnyCharUTF16 {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.0.hash(state)
+    }
+}
+
+impl PartialOrd<DafnyCharUTF16> for DafnyCharUTF16 {
+    fn partial_cmp(&self, other: &DafnyCharUTF16) -> Option<Ordering> {
+        (self.0).partial_cmp(&other.0)
+    }
+}
+
+#[derive(Clone)]
+pub struct DafnyChar(pub char);
+
+impl DafnyType for DafnyChar {}
+impl DafnyTypeEq for DafnyChar {}
+
+impl DafnyPrint for DafnyChar {
     #[inline]
     fn fmt_print(&self, f: &mut Formatter<'_>, in_seq: bool) -> std::fmt::Result {
         if in_seq {
-            write!(f, "{}", self)
+            write!(f, "{}", self.0)
         } else {
-            write!(f, "'{}'", self)
+            write!(f, "'{}'", self.0)
         }
     }
 
@@ -809,6 +1686,31 @@ impl DafnyPrint for char {
     }
 }
 
+impl Debug for DafnyChar
+{
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        self.fmt_print(f, false)
+    }
+}
+
+impl PartialEq<DafnyChar> for DafnyChar {
+    fn eq(&self, other: &DafnyChar) -> bool {
+        self.0 == other.0
+    }
+}
+
+impl PartialOrd<DafnyChar> for DafnyChar {
+    fn partial_cmp(&self, other: &DafnyChar) -> Option<Ordering> {
+        (self.0 as u32).partial_cmp(&(other.0 as u32))
+    }
+}
+impl Eq for DafnyChar {}
+impl Hash for DafnyChar {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.0.hash(state)
+    }
+}
+
 impl <T: DafnyPrint> DafnyPrint for Option<T> {
     fn fmt_print(&self, f: &mut Formatter<'_>, _in_seq: bool) -> std::fmt::Result {
         match self {
@@ -955,6 +1857,18 @@ impl <T: DafnyPrint> DafnyPrint for HashSet<T> {
     }
 }
 
+pub fn char_lt(left: char, right: char) -> bool {
+    let left_code = left as u32;
+    let right_code = right as u32;
+
+    left_code < right_code
+}
+
+pub fn string_of(s: &str) -> Sequence<DafnyChar> {
+    s.chars().map(|v| DafnyChar(v)).collect::<Sequence<DafnyChar>>()
+}
+
+
 macro_rules! impl_tuple_print {
     ($($items:ident)*) => {
         impl <$($items,)*> DafnyPrint for ($($items,)*)
@@ -1001,3 +1915,72 @@ impl_tuple_print_loop! {
     A21 A22 A23 A24 A25 A26 A27 A28 A29 A30
     A31
 }
+
+// seq!(1, 2, 3) is rewritten to Sequence::from_array_owned(vec!(1, 2, 3))
+#[macro_export]
+macro_rules! seq {
+    ($($x:expr),*) => {
+        $crate::Sequence::from_array_owned(vec![$($x), *])
+    }
+}
+
+#[macro_export]
+macro_rules! set {
+    ($($x:expr), *) => {
+        {
+            // No warning about this variable not needing to be mut in the case of an empty set
+            #[allow(unused_mut)]
+            let mut temp_hash = ::std::collections::HashSet::new();
+            $(
+                temp_hash.insert($x);
+            )*
+            $crate::Set::from_hashset_owned(temp_hash)
+        }
+    }
+}
+
+#[macro_export]
+macro_rules! multiset {
+    ($($x:expr), *) => {
+        {
+            #[allow(unused_mut)]
+            let mut temp_hash = ::std::collections::HashMap::new();
+            #[allow(unused_mut)]
+            let mut total_size: usize = 0;
+            $( {
+                #[allow(unused_mut)]
+                let mut entry = temp_hash.entry($x).or_insert($crate::DafnyInt::from(0));
+                *entry = (*entry).clone() + $crate::DafnyInt::from(1);
+                total_size += 1;
+              }
+            )*
+            $crate::Multiset {
+                data: temp_hash,
+                size: $crate::DafnyInt::from(total_size),
+            }
+        }
+    }
+}
+
+// we enable the syntax map![k1 => v1, k2 => v2]
+#[macro_export]
+macro_rules! map {
+    ($($k:expr => $v:expr), *) => {
+        {
+            #[allow(unused_mut)]
+            let mut temp_hash = ::std::collections::HashMap::new();
+            $(
+                temp_hash.insert($k.clone(), $v.clone());
+            )*
+            $crate::Map::from_hashmap_owned(temp_hash)
+        }
+    }
+}
+
+#[macro_export]
+macro_rules! int {
+    ($x:expr) => {
+        $crate::DafnyInt::from($x)
+    }
+}
+
diff --git a/Source/DafnyRuntime/DafnyRuntimeRust/src/tests/mod.rs b/Source/DafnyRuntime/DafnyRuntimeRust/src/tests/mod.rs
new file mode 100644
index 00000000000..ef8cb7838f4
--- /dev/null
+++ b/Source/DafnyRuntime/DafnyRuntimeRust/src/tests/mod.rs
@@ -0,0 +1,197 @@
+// Test module
+#[cfg(test)]
+mod tests {
+    use crate::*;
+
+    #[test]
+    fn test_sequence() {
+        let values = vec![1, 2, 3];
+        let seq = Sequence::<i32>::from_array_owned(values.clone());
+        assert_eq!(seq.cardinality_usize(), 3);
+        assert_eq!(seq.to_array(), values.into());
+
+        // Create a concat array, wrap it into a lazy one, get the i-th element,
+        // and verify that this operation flattened the array
+        let left = Sequence::<i32>::from_array_owned(vec![1, 2, 3]);
+        let right = Sequence::<i32>::from_array_owned(vec![4, 5, 6]);
+        let concat = Sequence::<i32>::new_concat_sequence(&left, &right);
+
+        assert_eq!(concat.cardinality_usize(), 6);
+        match &concat {
+            Sequence::ConcatSequence {
+                boxed,
+                length,
+                left,
+                right,
+            } => {
+                assert_eq!(*length, 6);
+                assert_eq!(unsafe { &*left.get() }.cardinality_usize(), 3);
+                // Test that boxed is None
+                assert!(boxed.as_ref().clone().borrow().as_ref().is_none());
+            }
+            _ => panic!("This should never happen"),
+        }
+        let value = concat.select(0);
+        assert_eq!(value, 1);
+        match &concat {
+            crate::Sequence::ConcatSequence {
+                boxed,
+                length,
+                left,
+                right,
+            } => {
+                assert_eq!(
+                    *boxed.as_ref().clone().borrow().as_ref().unwrap().as_ref(),
+                    vec![1, 2, 3, 4, 5, 6]
+                );
+            }
+            _ => panic!("This should never happen"),
+        }
+    }
+
+    #[test]
+    fn test_dafny_int() {
+        assert_eq!(int!(0).to_usize(), Some(0));
+        assert_eq!(int!(42).to_usize(), Some(42));
+    }
+
+    #[test]
+    fn test_dafny_sequence_print() {
+        let hello = seq![
+            DafnyChar('H'),
+            DafnyChar('e'),
+            DafnyChar('l'),
+            DafnyChar('l'),
+            DafnyChar('o')
+        ];
+        assert_eq!(DafnyPrintWrapper(&hello).to_string(), "Hello");
+        let hello = seq![
+            DafnyCharUTF16(0x0048),
+            DafnyCharUTF16(0x0065),
+            DafnyCharUTF16(0x006c),
+            DafnyCharUTF16(0x006c),
+            DafnyCharUTF16(0x006f)
+        ];
+        assert_eq!(DafnyPrintWrapper(&hello).to_string(), "Hello");
+        assert_eq!(DafnyPrintWrapper(&string_of("Hello")).to_string(), "Hello");
+        let hello = seq![1, 2, 3];
+        assert_eq!(DafnyPrintWrapper(&hello).to_string(), "[1, 2, 3]");
+    }
+    #[test]
+    fn test_dafny_sequence() {
+        let s = seq![55, 56, 57];
+        assert_eq!(seq![55, 56] != s, true);
+        assert_eq!(s.cardinality_usize(), 3);
+        assert_eq!(s.cardinality(), int!(3));
+        assert_eq!(s.get(&int!(1)), 56);
+        assert_eq!(s.slice(&int!(1), &int!(2)), seq![56]);
+        assert_eq!(s.take(&int!(2)), seq![55, 56]);
+        assert_eq!(s.drop(&int!(1)), seq![56, 57]);
+        assert_eq!(s.update_index(&int!(1), &8), seq![55, 8, 57]);
+        assert_eq!(s.concat(&seq![58, 59]), seq!(55, 56, 57, 58, 59));
+    }
+
+    #[test]
+    fn test_dafny_set() {
+        let s = set! {55, 56, 57, 56, 58};
+        let t = set! {59, 58, 57};
+        assert_eq!(s.cardinality_usize(), 4);
+        assert_eq!(s.cardinality(), int!(4));
+        assert_eq!(s.contains(&55), true);
+        assert_eq!(s.contains(&54), false);
+        assert_eq!(s.merge(&set! {}), s);
+        assert_eq!(set! {}.merge(&s), s);
+        assert_eq!(s.merge(&t), set! {59, 58, 57, 56, 55});
+        assert_eq!(s.intersect(&t), set! {57, 58});
+        assert_eq!(s.subtract(&set! {}), s);
+        assert_eq!(set! {}.subtract(&s), set! {});
+        let smt = s.subtract(&t);
+        assert_eq!(smt, set! {55, 56});
+        assert_eq!(t.subtract(&s), set! {59});
+        assert_eq!(s.disjoint(&set! {}), true);
+        assert_eq!(set! {}.disjoint(&s), true);
+        assert_eq!(s.disjoint(&t), false);
+        assert_eq!(t.disjoint(&s), false);
+        assert_eq!(smt.disjoint(&t), true);
+        assert_eq!(t.disjoint(&smt), true);
+        assert_eq!(s.elements(), s);
+        assert_eq!(
+            s.as_dafny_multiset(),
+            Multiset::from_array(&vec!(55, 56, 57, 58))
+        );
+    }
+
+    #[test]
+    fn test_dafny_multiset() {
+        let s = multiset! {55, 56, 57, 56, 58};
+        let t = multiset! {59, 58, 57, 56};
+        assert_eq!(s.cardinality_usize(), 5);
+        assert_eq!(s.cardinality(), int!(5));
+        assert_eq!(s.contains(&55), true);
+        assert_eq!(s.contains(&54), false);
+        assert_eq!(s.get(&54), int!(0));
+        assert_eq!(s.get(&55), int!(1));
+        assert_eq!(s.get(&56), int!(2));
+        assert_eq!(s.get(&57), int!(1));
+        assert_eq!(s.merge(&multiset! {}), s);
+        assert_eq!(multiset! {}.merge(&s), s);
+        let merged = multiset! {59, 58, 58, 57, 57, 56, 56, 56, 55};
+        assert_eq!(s.merge(&t), merged);
+        assert_eq!(merged.cardinality_usize(), 9);
+        assert_eq!(s.intersect(&t), multiset! {57, 58, 56});
+        assert_eq!(s.subtract(&multiset! {}), s);
+        assert_eq!(multiset! {}.subtract(&s), multiset! {});
+        let smt = s.subtract(&t);
+        assert_eq!(smt, multiset! {55, 56});
+        let tms = t.subtract(&s);
+        assert_eq!(tms, multiset! {59});
+        assert_eq!(s.disjoint(&multiset! {}), true);
+        assert_eq!(multiset! {}.disjoint(&s), true);
+        assert_eq!(s.disjoint(&t), false);
+        assert_eq!(t.disjoint(&s), false);
+        assert_eq!(smt.disjoint(&t), false);
+        assert_eq!(t.disjoint(&smt), false);
+        assert_eq!(tms.disjoint(&s), true);
+        assert_eq!(s.disjoint(&tms), true);
+        assert_eq!(s.as_dafny_multiset(), s);
+    }
+
+    #[test]
+    fn test_dafny_map() {
+        let m_empty: Map<i32, i32> = map![];
+        let m_3 = map![1 => 2, 3 => 6, 5 => 10];
+        let k_3 = set! {1, 3, 5};
+        let v_3 = set! {2, 6, 10};
+        assert_eq!(m_empty.cardinality_usize(), 0);
+        assert_eq!(m_empty.cardinality(), int!(0));
+        assert_eq!(m_3.cardinality_usize(), 3);
+        assert_eq!(m_3.cardinality(), int!(3));
+        assert_eq!(m_3.contains(&1), true);
+        assert_eq!(m_3.contains(&0), false);
+        assert_eq!(m_3.keys(), k_3);
+        assert_eq!(m_3.values(), v_3);
+        assert_eq!(m_3.get(&1), 2);
+        assert_eq!(m_3.get_or_none(&1), Some(2));
+        assert_eq!(m_3.get_or_none(&0), None);
+        let mut m_4 = m_3.update_index(&0, &2);
+        assert_eq!(m_3.contains(&0), false);
+        assert_eq!(m_4.contains(&0), true);
+        m_4 = m_4.update_index_owned(0, 7);
+        assert_eq!(m_4.contains(&0), true);
+
+        assert_eq!(m_4.get(&0), 7);
+        assert_eq!(m_4.cardinality_usize(), 4);
+        assert_eq!(m_4.merge(&map![]), m_4);
+        assert_eq!(map![].merge(&m_4), m_4);
+        let m_5 = m_4.merge(&map![3 => 9, 6 => 12]);
+        assert_eq!(m_5.cardinality_usize(), 5);
+        println!("m_4 is {:?}", m_4);
+        assert_eq!(m_4.get(&3), 6);
+        assert_eq!(m_5.get(&3), 9);
+        assert_eq!(m_5.subtract(&set! {}), m_5);
+        let m_4b = m_5.subtract(&set! {3});
+        assert_eq!(m_4b.cardinality_usize(), 4);
+        assert_eq!(m_4b.contains(&3), false)
+    }
+}
+// Struct containing two reference-counted fields
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/README.md b/Source/IntegrationTests/TestFiles/LitTests/LitTest/README.md
index 76cf0f69249..bee00ec45a8 100644
--- a/Source/IntegrationTests/TestFiles/LitTests/LitTest/README.md
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/README.md
@@ -60,7 +60,7 @@ the default command for any test that compiles and/or executes a valid Dafny pro
 
 This command will run the program with each backend
 and assert that the program output matches the content of `<test file>.expect`.
-See [the TestDafny utility](../Source/TestDafny/) for more details.
+See [the TestDafny utility](../../../../TestDafny/README.md) for more details.
 
 Any test that manually compiles and/or executes a program against one or more backends
 will be flagged by CI, and should be fixed by either converting it to use
@@ -105,3 +105,16 @@ so you may wish to remove the calls you are not interested in first, e.g. if you
 
 ## Updating test expect files
 If you set the static field `DiffCommand.UpdateExpectFile` to true instead of false, then the `diff` command in tests will not do a comparison but instead overwrite the expected file with the actual contents. This can be useful when you need to update expect files.
+
+## Updating compiler-specific test expect files
+To update compiler-specific error-aware output files for tests running with `%forEachDafnyCompiler`,
+do the following:
+
+1. Set the environment variable `DAFNY_INTEGRATION_TESTS_UPDATE_EXPECT_FILE` to `true` (See the Debugging Tests section above on how to set the environment variables)
+2. Set the environment variable `DAFNY_INTEGRATION_TESTS_ROOT_DIR` to the path to the  `dafny\Source\IntegrationTests` folder
+3. To additionally run only the foreach compiler tests, and specifically on one single compiler:
+  * Set the environment variable `DAFNY_INTEGRATION_TESTS_MODE` to `only-multi-backend`
+  * Set the environment variable `DAFNY_INTEGRATION_TESTS_ONLY_COMPILERS` to `rs` for rust for example. It's a comma-separated list of compiler IDs for which the tests should run
+
+With 1. and 2. every time a compiler encounters errors on a `file.dfy`, it will emit a `file.dfy.ID.error.expect` next to that file so that we know what this file is not supported by the compiler.
+Make sure you set `DAFNY_INTEGRATION_TESTS_UPDATE_EXPECT_FILE` back to false when you don't need to update these files!
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/VSComp2010/Problem4-Queens.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/VSComp2010/Problem4-Queens.dfy.rs.check
new file mode 100644
index 00000000000..c17262a423d
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/VSComp2010/Problem4-Queens.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>ForLoops</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/VerifyThis2015/Problem1.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/VerifyThis2015/Problem1.dfy.rs.check
new file mode 100644
index 00000000000..00ff9dc923b
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/VerifyThis2015/Problem1.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Type parameter Equality support Required not supported for type parameters</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/VerifyThis2015/Problem2.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/VerifyThis2015/Problem2.dfy.rs.check
new file mode 100644
index 00000000000..fbb03b77111
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/VerifyThis2015/Problem2.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.NullReferenceException: Object reference not set to an instance of an object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/VerifyThis2015/Problem3.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/VerifyThis2015/Problem3.dfy.rs.check
new file mode 100644
index 00000000000..5b69a820307
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/VerifyThis2015/Problem3.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0277]: the trait bound `Rc<Node>: DafnyType` is not satisfied
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/arrays.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/arrays.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/arrays.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/bit-vectors.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/bit-vectors.dfy.rs.check
new file mode 100644
index 00000000000..b87489fa29c
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/bit-vectors.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0433]: failed to resolve: use of undeclared crate or module `num`
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/class.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/class.dfy.rs.check
new file mode 100644
index 00000000000..b87489fa29c
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/class.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0433]: failed to resolve: use of undeclared crate or module `num`
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/const.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/const.dfy.rs.check
new file mode 100644
index 00000000000..d59836f7d8e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/const.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/datatypes.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/datatypes.dfy.rs.check
new file mode 100644
index 00000000000..2deaa060661
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/datatypes.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*Cannot declare local var outside of a statement container.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/generic.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/generic.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/generic.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/maps.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/maps.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/maps.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/recursion.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/recursion.dfy.rs.check
new file mode 100644
index 00000000000..b87489fa29c
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/recursion.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0433]: failed to resolve: use of undeclared crate or module `num`
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/seqs.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/seqs.dfy.rs.check
new file mode 100644
index 00000000000..4101aaa4513
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/seqs.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*use of undeclared crate or module `num`.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/sets.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/sets.dfy.rs.check
new file mode 100644
index 00000000000..b87489fa29c
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/c++/sets.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0433]: failed to resolve: use of undeclared crate or module `num`
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Arrays.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Arrays.dfy.rs.check
new file mode 100644
index 00000000000..66736e40df8
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Arrays.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>MultiSelectLValue</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/AsIs-Compile-Expanded.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/AsIs-Compile-Expanded.dfy.rs.check
new file mode 100644
index 00000000000..f84c3397b2f
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/AsIs-Compile-Expanded.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: AsIs-Compile-Expanded.dfy(18,10): Error: Feature not supported for this compilation target: Type test expressions (`x is T`)
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/AsIs-Compile.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/AsIs-Compile.dfy.rs.check
new file mode 100644
index 00000000000..8301cc8e992
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/AsIs-Compile.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Unknown buildable type: NULL
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/AutoInit.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/AutoInit.dfy.rs.check
new file mode 100644
index 00000000000..0c4268a75ce
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/AutoInit.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Expected a buffered value to have been populated because rhs != null
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/BuiltIns.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/BuiltIns.dfy.rs.check
new file mode 100644
index 00000000000..d59836f7d8e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/BuiltIns.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/BuiltIns_Unsupported.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/BuiltIns_Unsupported.dfy.rs.check
new file mode 100644
index 00000000000..dae9bb332ac
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/BuiltIns_Unsupported.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/ByMethodCompilation.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/ByMethodCompilation.dfy.rs.check
new file mode 100644
index 00000000000..36fc3c768d2
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/ByMethodCompilation.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: arguments to this function are incorrect
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Calls.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Calls.dfy.rs.check
new file mode 100644
index 00000000000..2a0f83900f2
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Calls.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: (0,-1): Error: Feature not supported for this compilation target: The /runAllTests option
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Class.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Class.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Class.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Collections.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Collections.dfy.rs.check
new file mode 100644
index 00000000000..3dec7f442bb
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Collections.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>EmitIndexCollectionUpdate for multiset<uint32></i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Comprehensions.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Comprehensions.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Comprehensions.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/ComprehensionsNewSyntax.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/ComprehensionsNewSyntax.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/ComprehensionsNewSyntax.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/CovariantCollections.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/CovariantCollections.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/CovariantCollections.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Datatype.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Datatype.dfy.rs.check
new file mode 100644
index 00000000000..b854087b719
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Datatype.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*System.InvalidOperationException: Expected a buffered value to have been populated because rhs != null.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/DefaultParameters-Compile.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/DefaultParameters-Compile.dfy.rs.check
new file mode 100644
index 00000000000..d59836f7d8e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/DefaultParameters-Compile.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/DowncastClone.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/DowncastClone.dfy.rs.check
new file mode 100644
index 00000000000..0c4268a75ce
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/DowncastClone.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Expected a buffered value to have been populated because rhs != null
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/DuplicateArrowNames.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/DuplicateArrowNames.dfy.rs.check
new file mode 100644
index 00000000000..0c4268a75ce
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/DuplicateArrowNames.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Expected a buffered value to have been populated because rhs != null
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/ErasableTypeWrappers.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/ErasableTypeWrappers.dfy.rs.check
new file mode 100644
index 00000000000..54c971c04bc
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/ErasableTypeWrappers.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Unknown buildable type: NULL
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/EuclideanDivision.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/EuclideanDivision.dfy.rs.check
new file mode 100644
index 00000000000..030d3bbdc4b
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/EuclideanDivision.dfy.rs.check
@@ -0,0 +1,2 @@
+// CHECK-L: error[E0308]: mismatched types
+// CHECK: .*expected `I1`, found `DafnyInt`.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/ForLoops-Compilation.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/ForLoops-Compilation.dfy.rs.check
new file mode 100644
index 00000000000..c17262a423d
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/ForLoops-Compilation.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>ForLoops</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Forall.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Forall.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Forall.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/ForallNewSyntax.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/ForallNewSyntax.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/ForallNewSyntax.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/GeneralNewtypes.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/GeneralNewtypes.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/GeneralNewtypes.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Iterators.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Iterators.dfy.rs.check
new file mode 100644
index 00000000000..5f4be69b267
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Iterators.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Builder not StatementContainer</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Let.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Let.dfy.rs.check
new file mode 100644
index 00000000000..d59836f7d8e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Let.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/MoreAutoInit.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/MoreAutoInit.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/MoreAutoInit.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/NativeNumbers.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/NativeNumbers.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/NativeNumbers.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/NestedArrays.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/NestedArrays.dfy.rs.check
new file mode 100644
index 00000000000..45a237e6339
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/NestedArrays.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0277]: cannot add `nat` to `BigInt`
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Numbers.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Numbers.dfy.rs.check
new file mode 100644
index 00000000000..fbb03b77111
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Numbers.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.NullReferenceException: Object reference not set to an instance of an object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Poly.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Poly.dfy.rs.check
new file mode 100644
index 00000000000..fbb03b77111
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Poly.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.NullReferenceException: Object reference not set to an instance of an object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/StaticMembersOfGenericTypes.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/StaticMembersOfGenericTypes.dfy.rs.check
new file mode 100644
index 00000000000..0c4268a75ce
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/StaticMembersOfGenericTypes.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Expected a buffered value to have been populated because rhs != null
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/TailRecursion.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/TailRecursion.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/TailRecursion.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/TypeDescriptors.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/TypeDescriptors.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/TypeDescriptors.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/TypeParams.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/TypeParams.dfy.rs.check
new file mode 100644
index 00000000000..0c4268a75ce
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/TypeParams.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Expected a buffered value to have been populated because rhs != null
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/UnicodeStrings.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/UnicodeStrings.dfy.rs.check
new file mode 100644
index 00000000000..c17262a423d
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/UnicodeStrings.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>ForLoops</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Uninitialized.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Uninitialized.dfy.rs.check
new file mode 100644
index 00000000000..158d9484360
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Uninitialized.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>QuantifierExpr</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/UnoptimizedErasableTypeWrappers.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/UnoptimizedErasableTypeWrappers.dfy.rs.check
new file mode 100644
index 00000000000..d59836f7d8e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/UnoptimizedErasableTypeWrappers.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Variance.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Variance.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Variance.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Various.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Various.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/Various.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/firstSteps/1_Calls-F.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/firstSteps/1_Calls-F.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/firstSteps/1_Calls-F.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/firstSteps/2_Modules.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/firstSteps/2_Modules.dfy.rs.check
new file mode 100644
index 00000000000..d59836f7d8e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/firstSteps/2_Modules.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/firstSteps/3_Calls-As.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/firstSteps/3_Calls-As.dfy.rs.check
new file mode 100644
index 00000000000..a57b83becdb
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/firstSteps/3_Calls-As.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0614]: type `DafnyInt` cannot be dereferenced
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/firstSteps/4_Calls-FunctionsValues-Class+NT.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/firstSteps/4_Calls-FunctionsValues-Class+NT.dfy.rs.check
new file mode 100644
index 00000000000..2a0f83900f2
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/firstSteps/4_Calls-FunctionsValues-Class+NT.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: (0,-1): Error: Feature not supported for this compilation target: The /runAllTests option
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/firstSteps/5_Calls-FunctionsValues-Dt.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/firstSteps/5_Calls-FunctionsValues-Dt.dfy.rs.check
new file mode 100644
index 00000000000..b216498bb86
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/firstSteps/5_Calls-FunctionsValues-Dt.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0782]: trait objects must include the `dyn` keyword
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/firstSteps/6_Calls-VariableCapture.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/firstSteps/6_Calls-VariableCapture.dfy.rs.check
new file mode 100644
index 00000000000..0c4268a75ce
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/firstSteps/6_Calls-VariableCapture.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Expected a buffered value to have been populated because rhs != null
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/firstSteps/7_Arrays.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/firstSteps/7_Arrays.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/firstSteps/7_Arrays.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/firstSteps/7_Dt_Algebraic.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/firstSteps/7_Dt_Algebraic.dfy.rs.check
new file mode 100644
index 00000000000..9be48cfdfeb
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/firstSteps/7_Dt_Algebraic.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>EmitDatatypeBoundedPool</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/replaceables/replaceableHappyflow.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/replaceables/replaceableHappyflow.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/replaceables/replaceableHappyflow.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/rust/operators.dfy b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/rust/operators.dfy
new file mode 100644
index 00000000000..a4605a78142
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/rust/operators.dfy
@@ -0,0 +1,317 @@
+// NONUNIFORM: Temporary development of the Rust compiler
+// RUN: %baredafny run --target=rs "%s" > "%t"
+// RUN: %diff "%s.expect" "%t"
+ghost const TWO_TO_THE_8:   int := 0x100
+ghost const TWO_TO_THE_16:  int := 0x10000
+ghost const TWO_TO_THE_32:  int := 0x1_00000000
+ghost const TWO_TO_THE_64:  int := 0x1_00000000_00000000
+ghost const TWO_TO_THE_128:  int := 0x1_00000000_00000000_00000000_00000000
+newtype uint8  = x: int | 0 <= x < TWO_TO_THE_8
+newtype uint16 = x: int | 0 <= x < TWO_TO_THE_16
+newtype uint32 = x: int | 0 <= x < TWO_TO_THE_32
+newtype uint64 = x: int | 0 <= x < TWO_TO_THE_64
+newtype uint128 = x: int | 0 <= x < TWO_TO_THE_128
+
+newtype int8  = x: int  | -0x80 <= x < 0x80
+newtype int16 = x: int  | -0x8000 <= x < 0x8000
+newtype int32 = x: int  | -0x8000_0000 <= x < 0x8000_0000
+newtype int64 = x: int  | -0x8000_0000_0000_0000 <= x < 0x8000_0000_0000_0000
+newtype int128 = x: int  | -0x8000_0000_0000_0000_0000_0000_0000_0000 <= x < 0x8000_0000_0000_0000_0000_0000_0000_0000
+
+method TestU8() {
+  var o8: uint8 := 1 as uint8;
+  var s8: uint8 := 2 as uint8;
+  var w8: uint8 := 5 as uint8;
+  var x8: uint8 := 8 as uint8;
+  var y8: uint8 := 13 as uint8;
+  var z8: uint8 := 21 as uint8;
+  var m8: uint8 := 24 as uint8;
+  var t8: uint8 := 16 as uint8;
+  expect x8 + y8 == z8;
+  expect y8 - x8 == w8;
+  expect x8 as bv8 & y8 as bv8 == x8 as bv8;
+  expect x8 as bv8 | y8 as bv8 == y8 as bv8;
+  expect x8 as bv8 ^ y8 as bv8 == w8 as bv8;
+  expect x8 * 3 == m8;
+  expect x8 as bv8 >> s8 == s8 as bv8;
+  expect x8 as bv8 << o8 == t8 as bv8;
+  print "operators(u8) ";
+}
+method TestI8() {
+  var o8: int8 := 1 as int8;
+  var s8: int8 := 2 as int8;
+  var w8: int8 := 5 as int8;
+  var x8: int8 := 8 as int8;
+  var y8: int8 := 13 as int8;
+  var z8: int8 := 21 as int8;
+  var m8: int8 := 24 as int8;
+  var t8: int8 := 16 as int8;
+  expect x8 + y8 == z8;
+  expect x8 - y8 == -w8;
+  expect x8 * 3 == m8;
+  print "operators(i8) ";
+}
+method TestU16() {
+  var o16: uint16 := 1 as uint16;
+  var s16: uint16 := 2 as uint16;
+  var w16: uint16 := 5 as uint16;
+  var x16: uint16 := 8 as uint16;
+  var y16: uint16 := 13 as uint16;
+  var z16: uint16 := 21 as uint16;
+  var m16: uint16 := 24 as uint16;
+  var t16: uint16 := 16 as uint16;
+  expect x16 + y16 == z16;
+  expect y16 - x16 == w16;
+  expect x16 as bv16 & y16 as bv16 == x16 as bv16;
+  expect x16 as bv16 | y16 as bv16 == y16 as bv16;
+  expect x16 as bv16 ^ y16 as bv16 == w16 as bv16;
+  expect x16 * 3 == m16;
+  expect x16 as bv16 >> s16 as bv16 == s16 as bv16;
+  expect x16 as bv16 << o16 as bv16 == t16 as bv16;
+  print "operators(u16) ";
+}
+
+method TestI16() {
+  var o16: int16 := 1 as int16;
+  var s16: int16 := 2 as int16;
+  var w16: int16 := 5 as int16;
+  var x16: int16 := 8 as int16;
+  var y16: int16 := 13 as int16;
+  var z16: int16 := 21 as int16;
+  var m16: int16 := 24 as int16;
+  var t16: int16 := 16 as int16;
+  expect x16 + y16 == z16;
+  expect x16 - y16 == -w16;
+  expect x16 * 3 == m16;
+  print "operators(i16) ";
+}
+method TestU32() {
+  var o32: uint32 := 1 as uint32;
+  var s32: uint32 := 2 as uint32;
+  var w32: uint32 := 5 as uint32;
+  var x32: uint32 := 8 as uint32;
+  var y32: uint32 := 13 as uint32;
+  var z32: uint32 := 21 as uint32;
+  var m32: uint32 := 24 as uint32;
+  var t32: uint32 := 16 as uint32;
+  expect x32 + y32 == z32;
+  expect y32 - x32 == w32;
+  expect x32 as bv32 & y32 as bv32 == x32 as bv32;
+  expect x32 as bv32 | y32 as bv32 == y32 as bv32;
+  expect x32 as bv32 ^ y32 as bv32 == w32 as bv32;
+  expect x32 * 3 == m32;
+  expect x32 as bv32 >> s32 as bv32 == s32 as bv32;
+  expect x32 as bv32 << o32 as bv32 == t32 as bv32;
+  print "operators(u32) ";
+}
+
+method TestI32() {
+  var o32: int32 := 1 as int32;
+  var s32: int32 := 2 as int32;
+  var w32: int32 := 5 as int32;
+  var x32: int32 := 8 as int32;
+  var y32: int32 := 13 as int32;
+  var z32: int32 := 21 as int32;
+  var m32: int32 := 24 as int32;
+  var t32: int32 := 16 as int32;
+  expect x32 + y32 == z32;
+  expect x32 - y32 == -w32;
+  expect x32 * 3 == m32;
+  print "operators(i32) ";
+}
+method TestU64() {
+  var o64: uint64 := 1 as uint64;
+  var s64: uint64 := 2 as uint64;
+  var w64: uint64 := 5 as uint64;
+  var x64: uint64 := 8 as uint64;
+  var y64: uint64 := 13 as uint64;
+  var z64: uint64 := 21 as uint64;
+  var m64: uint64 := 24 as uint64;
+  var t64: uint64 := 16 as uint64;
+  expect x64 + y64 == z64;
+  expect y64 - x64 == w64;
+  expect x64 as bv64 & y64 as bv64 == x64 as bv64;
+  expect x64 as bv64 | y64 as bv64 == y64 as bv64;
+  expect x64 as bv64 ^ y64 as bv64 == w64 as bv64;
+  expect x64 * 3 == m64;
+  expect x64 as bv64 >> s64 as bv64 == s64 as bv64;
+  expect x64 as bv64 << o64 as bv64 == t64 as bv64;
+  print "operators(u64) ";
+}
+method TestI64() {
+  var o64: int64 := 1 as int64;
+  var s64: int64 := 2 as int64;
+  var w64: int64 := 5 as int64;
+  var x64: int64 := 8 as int64;
+  var y64: int64 := 13 as int64;
+  var z64: int64 := 21 as int64;
+  var m64: int64 := 24 as int64;
+  var t64: int64 := 16 as int64;
+  expect x64 + y64 == z64;
+  expect x64 - y64 == -w64;
+  expect x64 * 3 == m64;
+  print "operators(i64) ";
+}
+method TestU128() {
+  var o128: uint128 := 1 as uint128;
+  var s128: uint128 := 2 as uint128;
+  var w128: uint128 := 5 as uint128;
+  var x128: uint128 := 8 as uint128;
+  var y128: uint128 := 13 as uint128;
+  var z128: uint128 := 21 as uint128;
+  var m128: uint128 := 24 as uint128;
+  var t128: uint128 := 16 as uint128;
+  expect x128 + y128 == z128;
+  expect y128 - x128 == w128;
+  expect x128 as bv128 & y128 as bv128 == x128 as bv128;
+  expect x128 as bv128 | y128 as bv128 == y128 as bv128;
+  expect x128 as bv128 ^ y128 as bv128 == w128 as bv128;
+  expect x128 * 3 == m128;
+  expect x128 as bv128 >> s128 as bv128 == s128 as bv128;
+  expect x128 as bv128 << o128 as bv128 == t128 as bv128;
+  print "operators(u128)\n";
+}
+
+method TestI128() {
+  var o128: int128 := 1 as int128;
+  var s128: int128 := 2 as int128;
+  var w128: int128 := 5 as int128;
+  var x128: int128 := 8 as int128;
+  var y128: int128 := 13 as int128;
+  var z128: int128 := 21 as int128;
+  var m128: int128 := 24 as int128;
+  var t128: int128 := 16 as int128;
+  expect x128 + y128 == z128;
+  expect x128 - y128 == -w128;
+  expect x128 * 3 == m128;
+  print "operators(i128)\n";
+}
+method {:resource_limit "1e6"}  Main() {
+  var t := true;
+  var f := false;
+  expect ((t && f) || f) ==> f;
+  print "&& || ==> ";
+  expect t && f <==> f && t;
+  print "<==> ";
+
+  expect 2 <= 3;
+  expect 2 < 3;
+  expect 3 >= 2;
+  expect 3 > 2;
+  expect 3 != 2;
+  expect 2 == 2;
+  print "<= < >= > != ==\n";
+
+  expect 2 + 2 == 4;
+  expect 2 * 2 == 4;
+  expect 2 - 2 == 0;
+  expect -1 / 2 == -1;
+  expect 5 % 2 == 1;
+  print "+ * - / %\n";
+  TestU8();
+  TestU16();
+  TestU32();
+  TestU64();
+  TestU128();
+  TestI8();
+  TestI16();
+  TestI32();
+  TestI64();
+  TestI128();
+  
+  var a := 'a';
+  var z := 'z';
+  expect a < z;
+  expect z > a;
+  expect a <= a;
+  expect a >= a;
+  expect a != z;
+  expect a == a;
+  expect !(a < a);
+  expect !(z < a);
+  expect !(z <= a);
+  expect !(a >= z);
+  print "char comparison\n";
+  
+  var m := map[1 := 2];
+  expect 1 in m;
+  expect 2 !in m;
+  expect m[1] == 2;
+  print "map contains acccess ";
+  var m2 := m[2 := 4] - {1};
+  expect 1 !in m2;
+  expect 2 in m2;
+  print "update union diff ";
+  var m3 := map k | 2 <= k < 4 :: k := 2*k;
+  expect m3 == map[3 := 6, 2 := 4];
+  expect |m3| == 2;
+  print "comprehension equality cardinality ";
+  
+  expect m3.Keys == {2, 3};
+  expect m3.Values == {4, 6};
+  print ".Keys and .Values\n";
+
+  var st := {1};
+  expect 1 in st;
+  expect 2 !in st;
+  print "set contains ";
+  var t2 := st + {2} - {1};
+  expect 1 !in t2;
+  expect 2 in t2;
+  print "union diff ";
+  var t3 := set k | 2 <= k < 4 :: 2*k;
+  expect t3 == {6, 4};
+  expect |t3| == 2;
+  expect {4, 6} <= t3;
+  expect {4} < t3;
+  expect t3 >= {4, 6};
+  expect t3 > {6};
+  print "comprehension equality cardinality ";
+  expect t2 != t3;
+  expect t2 * t3 == {};
+  expect t2 !! t3;
+  print "inequality and intersection\n";
+  
+  var s1 := seq(2, i => 1 + i);
+  var s2 := s1 + [3];
+  expect s1 <= s2;
+  expect s1 < s2;
+  expect s1 != s2;
+  expect !(s2 <= s1);
+  expect !(s2 < s1);
+  expect s2 != s1;
+  expect !(s1 == s2);
+  print "sequence prefix ";
+  var s3 := if |s2| == 3 then s2[2 := 4] else s2;
+  expect s3[1] == 2;
+  expect s3 == [1, 2, 4];
+  expect |s3| == 3;
+  print "sequence update cardinality ";
+
+  var s4 := if |s3| >= 3 then s3[1..3] else s3;
+  expect s4 == [2, 4];
+  print "sequence slice\n";
+
+  var h := multiset{1, 1, 2};
+  var k := multiset([1, 2]);
+  expect k < h;
+  expect k <= h;
+  expect h > k;
+  expect h >= k;
+  print "multiset comparison ";
+  expect k + h == multiset{1, 1, 1, 2, 2};
+  print "union equality ";
+  expect 1 in h;
+  expect h[1] == 2;
+  expect |h| == 3;
+  print "access and cardinality\n";
+  
+  var seq1: seq<int> := [1, 2, 3, 4];
+  var seq2: int := seq1[0];
+  var seq3: seq<int> := seq1[1..4];
+  var seq4: seq<int> := seq3 + [seq2];
+  expect seq4[0] == 2;
+  expect seq4[3] == 1;
+  expect seq4[0..3] == seq3;
+  print "Sequence index slice comparison";
+}
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/rust/operators.dfy.expect b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/rust/operators.dfy.expect
new file mode 100644
index 00000000000..3c24ec5673b
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/comp/rust/operators.dfy.expect
@@ -0,0 +1,12 @@
+
+Dafny program verifier finished with 21 verified, 0 errors
+&& || ==> <==> <= < >= > != ==
++ * - / %
+operators(u8) operators(u16) operators(u32) operators(u64) operators(u128)
+operators(i8) operators(i16) operators(i32) operators(i64) operators(i128)
+char comparison
+map contains acccess update union diff comprehension equality cardinality .Keys and .Values
+set contains union diff comprehension equality cardinality inequality and intersection
+sequence prefix sequence update cardinality sequence slice
+multiset comparison union equality access and cardinality
+Sequence index slice comparison
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/ArrayElementInitCompile.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/ArrayElementInitCompile.dfy.rs.check
new file mode 100644
index 00000000000..c17262a423d
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/ArrayElementInitCompile.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>ForLoops</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/Bitvectors.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/Bitvectors.dfy.rs.check
new file mode 100644
index 00000000000..34601dcae40
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/Bitvectors.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>EmitBitvectorTruncation</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/Constant.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/Constant.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/Constant.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/DiscoverBounds.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/DiscoverBounds.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/DiscoverBounds.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/DividedConstructors.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/DividedConstructors.dfy.rs.check
new file mode 100644
index 00000000000..f12da961eee
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/DividedConstructors.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Traits</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/EqualityTypesCompile.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/EqualityTypesCompile.dfy.rs.check
new file mode 100644
index 00000000000..00ff9dc923b
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/EqualityTypesCompile.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Type parameter Equality support Required not supported for type parameters</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/ForallCompilationNewSyntax.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/ForallCompilationNewSyntax.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/ForallCompilationNewSyntax.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/GeneralNewtypeCollections.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/GeneralNewtypeCollections.dfy.rs.check
new file mode 100644
index 00000000000..fbb03b77111
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/GeneralNewtypeCollections.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.NullReferenceException: Object reference not set to an instance of an object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/GhostITECompilation.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/GhostITECompilation.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/GhostITECompilation.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/InitialValues.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/InitialValues.dfy.rs.check
new file mode 100644
index 00000000000..e2c2d7720f6
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/InitialValues.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0277]: cannot add `Rc<num_rational::Ratio<BigInt>>` to `num_rational::Ratio<BigInt>`
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/MatchBraces.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/MatchBraces.dfy.rs.check
new file mode 100644
index 00000000000..d59836f7d8e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/MatchBraces.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/MoForallCompilation.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/MoForallCompilation.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/MoForallCompilation.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/NameclashesCompile.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/NameclashesCompile.dfy.rs.check
new file mode 100644
index 00000000000..2a0f83900f2
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/NameclashesCompile.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: (0,-1): Error: Feature not supported for this compilation target: The /runAllTests option
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/NonZeroInitializationCompile.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/NonZeroInitializationCompile.dfy.rs.check
new file mode 100644
index 00000000000..876b3f57d7c
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/NonZeroInitializationCompile.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*System.NullReferenceException: Object reference not set to an instance of an object.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/NullComparisonWarnings.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/NullComparisonWarnings.dfy.rs.check
new file mode 100644
index 00000000000..158d9484360
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/NullComparisonWarnings.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>QuantifierExpr</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/RangeCompilation.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/RangeCompilation.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/RangeCompilation.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/RuntimeTypeTests0.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/RuntimeTypeTests0.dfy.rs.check
new file mode 100644
index 00000000000..a3237e853cc
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/RuntimeTypeTests0.dfy.rs.check
@@ -0,0 +1 @@
+//CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/SeqFromArray.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/SeqFromArray.dfy.rs.check
new file mode 100644
index 00000000000..3d586af71fb
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/SeqFromArray.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0061]: this function takes 1 argument but 0 arguments were supplied
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/SharedDestructorsCompile.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/SharedDestructorsCompile.dfy.rs.check
new file mode 100644
index 00000000000..1780a109123
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/SharedDestructorsCompile.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0277]: the trait bound `Rc<Dt>: DafnyType` is not satisfied
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/SiblingImports.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/SiblingImports.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/SiblingImports.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/Strings.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/Strings.dfy.rs.check
new file mode 100644
index 00000000000..84e78c23b36
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/Strings.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Char literal without unicode char enabled</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/TypeConversionsCompile.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/TypeConversionsCompile.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/TypeConversionsCompile.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/TypeMembers.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/TypeMembers.dfy.rs.check
new file mode 100644
index 00000000000..2a0f83900f2
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/TypeMembers.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: (0,-1): Error: Feature not supported for this compilation target: The /runAllTests option
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/Wellfounded.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/Wellfounded.dfy.rs.check
new file mode 100644
index 00000000000..158d9484360
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny0/Wellfounded.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>QuantifierExpr</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny2/MinWindowMax.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny2/MinWindowMax.dfy.rs.check
new file mode 100644
index 00000000000..186e8dcb2c2
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny2/MinWindowMax.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0070]: invalid left-hand side of assignment
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny2/SmallestMissingNumber-functional.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny2/SmallestMissingNumber-functional.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny2/SmallestMissingNumber-functional.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny2/SmallestMissingNumber-imperative.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny2/SmallestMissingNumber-imperative.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny2/SmallestMissingNumber-imperative.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny2/StoreAndRetrieve.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny2/StoreAndRetrieve.dfy.rs.check
new file mode 100644
index 00000000000..00ff9dc923b
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny2/StoreAndRetrieve.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Type parameter Equality support Required not supported for type parameters</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny2/pq-intrinsic-extrinsic.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny2/pq-intrinsic-extrinsic.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny2/pq-intrinsic-extrinsic.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny3/Abstemious.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny3/Abstemious.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny3/Abstemious.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny3/CachedContainer.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny3/CachedContainer.dfy.rs.check
new file mode 100644
index 00000000000..00ff9dc923b
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny3/CachedContainer.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Type parameter Equality support Required not supported for type parameters</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny3/Iter.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny3/Iter.dfy.rs.check
new file mode 100644
index 00000000000..ca001e7600e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny3/Iter.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Cannot declare local var outside of a statement container: 
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Ackermann.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Ackermann.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Ackermann.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug107.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug107.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug107.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug108.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug108.dfy.rs.check
new file mode 100644
index 00000000000..2a79815c2f2
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug108.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>EmitMapBoundedPool</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug116.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug116.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug116.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug140.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug140.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug140.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug148.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug148.dfy.rs.check
new file mode 100644
index 00000000000..d59836f7d8e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug148.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug49.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug49.dfy.rs.check
new file mode 100644
index 00000000000..0c4268a75ce
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug49.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Expected a buffered value to have been populated because rhs != null
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug60.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug60.dfy.rs.check
new file mode 100644
index 00000000000..2a79815c2f2
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug60.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>EmitMapBoundedPool</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug67.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug67.dfy.rs.check
new file mode 100644
index 00000000000..692bbaa5603
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug67.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0277]: the trait bound `Sequence<DafnyInt>: Default` is not satisfied
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug68.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug68.dfy.rs.check
new file mode 100644
index 00000000000..6935e65ddc6
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug68.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0277]: the trait bound `Set<DafnyInt>: DafnyTypeEq` is not satisfied
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug94.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug94.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Bug94.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/ClassRefinement.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/ClassRefinement.dfy.rs.check
new file mode 100644
index 00000000000..d59836f7d8e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/ClassRefinement.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/ExpandedGuardedness.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/ExpandedGuardedness.dfy.rs.check
new file mode 100644
index 00000000000..2ab0d5f706d
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/ExpandedGuardedness.dfy.rs.check
@@ -0,0 +1 @@
+//CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/FlyingRobots.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/FlyingRobots.dfy.rs.check
new file mode 100644
index 00000000000..705ca2e502a
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/FlyingRobots.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0277]: the trait bound `Rc<Bot>: DafnyType` is not satisfied
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/McCarthy91.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/McCarthy91.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/McCarthy91.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/NatList.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/NatList.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/NatList.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Regression2.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Regression2.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Regression2.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Regression3.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Regression3.dfy.rs.check
new file mode 100644
index 00000000000..86b007ed165
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Regression3.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Special field: Floor</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Regression4.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Regression4.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Regression4.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Regression6.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Regression6.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Regression6.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Regression7.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Regression7.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Regression7.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Regression9.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Regression9.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/Regression9.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/UnionFind.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/UnionFind.dfy.rs.check
new file mode 100644
index 00000000000..792d0d1869f
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/UnionFind.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0369]: binary operation `<` cannot be applied to type `&nat`
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/gcd.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/gcd.dfy.rs.check
new file mode 100644
index 00000000000..d59836f7d8e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/gcd.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/git-issue104.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/git-issue104.dfy.rs.check
new file mode 100644
index 00000000000..158d9484360
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/git-issue104.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>QuantifierExpr</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/git-issue15.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/git-issue15.dfy.rs.check
new file mode 100644
index 00000000000..47ba6be61df
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/git-issue15.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0277]: the trait bound `Rc<foo>: DafnyTypeEq` is not satisfied
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/git-issue195.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/git-issue195.dfy.rs.check
new file mode 100644
index 00000000000..7d6c2fd331e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/git-issue195.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Type name for ORDINAL \(Microsoft_dDafny_dBigOrdinalType\)</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/git-issue196.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/git-issue196.dfy.rs.check
new file mode 100644
index 00000000000..66736e40df8
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/git-issue196.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>MultiSelectLValue</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/git-issue4.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/git-issue4.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/git-issue4.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/git-issue76.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/git-issue76.dfy.rs.check
new file mode 100644
index 00000000000..6c32e0626af
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/git-issue76.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>EmitWiggleWaggleBoundedPool</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/git-issue88.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/git-issue88.dfy.rs.check
new file mode 100644
index 00000000000..66736e40df8
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/dafny4/git-issue88.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>MultiSelectLValue</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/exceptions/Exceptions1.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/exceptions/Exceptions1.dfy.rs.check
new file mode 100644
index 00000000000..f12da961eee
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/exceptions/Exceptions1.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Traits</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/exceptions/Exceptions1Expressions.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/exceptions/Exceptions1Expressions.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/exceptions/Exceptions1Expressions.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/exports/FIFO.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/exports/FIFO.dfy.rs.check
new file mode 100644
index 00000000000..692bbaa5603
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/exports/FIFO.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0277]: the trait bound `Sequence<DafnyInt>: Default` is not satisfied
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/exports/LIFO.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/exports/LIFO.dfy.rs.check
new file mode 100644
index 00000000000..692bbaa5603
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/exports/LIFO.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0277]: the trait bound `Sequence<DafnyInt>: Default` is not satisfied
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/exports/xrefine2.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/exports/xrefine2.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/exports/xrefine2.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/exports/xrefine3.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/exports/xrefine3.dfy.rs.check
new file mode 100644
index 00000000000..87cdbc387dc
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/exports/xrefine3.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0277]: the trait bound `Sequence<bool>: Default` is not satisfied
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/ghost/Comp.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/ghost/Comp.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/ghost/Comp.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1029.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1029.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1029.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1093.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1093.dfy.rs.check
new file mode 100644
index 00000000000..d59836f7d8e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1093.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1150.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1150.dfy.rs.check
new file mode 100644
index 00000000000..d59836f7d8e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1150.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1185.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1185.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1185.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1514.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1514.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1514.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1514b.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1514b.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1514b.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1514c.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1514c.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1514c.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1553.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1553.dfy.rs.check
new file mode 100644
index 00000000000..3d0f8bdf00d
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1553.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0277]: the trait bound `Sequence<_R>: Default` is not satisfied
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1604.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1604.dfy.rs.check
new file mode 100644
index 00000000000..54c971c04bc
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1604.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Unknown buildable type: NULL
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1604b.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1604b.dfy.rs.check
new file mode 100644
index 00000000000..158d9484360
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1604b.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>QuantifierExpr</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1607.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1607.dfy.rs.check
new file mode 100644
index 00000000000..24900e91fa9
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1607.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0277]: the trait bound `&bool: DafnyPrint` is not satisfied
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1714.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1714.dfy.rs.check
new file mode 100644
index 00000000000..54c971c04bc
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1714.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Unknown buildable type: NULL
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1815a.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1815a.dfy.rs.check
new file mode 100644
index 00000000000..f12da961eee
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1815a.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Traits</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1815b.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1815b.dfy.rs.check
new file mode 100644
index 00000000000..f12da961eee
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1815b.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Traits</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1852.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1852.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1852.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1903.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1903.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1903.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1909.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1909.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-1909.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2013.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2013.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2013.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2103.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2103.dfy.rs.check
new file mode 100644
index 00000000000..2b5a27013a7
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2103.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Type variance Co not supported</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2173.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2173.dfy.rs.check
new file mode 100644
index 00000000000..d59836f7d8e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2173.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2510.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2510.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2510.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-258.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-258.dfy.rs.check
new file mode 100644
index 00000000000..84e78c23b36
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-258.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Char literal without unicode char enabled</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2581.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2581.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2581.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-261.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-261.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-261.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-262.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-262.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-262.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2672.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2672.dfy.rs.check
new file mode 100644
index 00000000000..a7107d30768
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2672.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: `_` cannot be a raw identifier
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2708.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2708.dfy.rs.check
new file mode 100644
index 00000000000..186e8dcb2c2
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2708.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0070]: invalid left-hand side of assignment
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2726a.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2726a.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2726a.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2792.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2792.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-2792.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-283.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-283.dfy.rs.check
new file mode 100644
index 00000000000..f12da961eee
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-283.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Traits</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-283f.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-283f.dfy.rs.check
new file mode 100644
index 00000000000..d59836f7d8e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-283f.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-354.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-354.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-354.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-356.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-356.dfy.rs.check
new file mode 100644
index 00000000000..84e78c23b36
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-356.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Char literal without unicode char enabled</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-364.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-364.dfy.rs.check
new file mode 100644
index 00000000000..d59836f7d8e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-364.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-3734.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-3734.dfy.rs.check
new file mode 100644
index 00000000000..b87489fa29c
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-3734.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0433]: failed to resolve: use of undeclared crate or module `num`
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-3868.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-3868.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-3868.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-3873.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-3873.dfy.rs.check
new file mode 100644
index 00000000000..2a79815c2f2
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-3873.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>EmitMapBoundedPool</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-3883.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-3883.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-3883.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-3978.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-3978.dfy.rs.check
new file mode 100644
index 00000000000..c17262a423d
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-3978.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>ForLoops</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-3987.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-3987.dfy.rs.check
new file mode 100644
index 00000000000..c17262a423d
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-3987.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>ForLoops</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-4007.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-4007.dfy.rs.check
new file mode 100644
index 00000000000..c17262a423d
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-4007.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>ForLoops</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-4012.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-4012.dfy.rs.check
new file mode 100644
index 00000000000..a6f8bf72073
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-4012.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>EmitIndexCollectionUpdate for multiset<\(\)></i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-4141.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-4141.dfy.rs.check
new file mode 100644
index 00000000000..00ff9dc923b
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-4141.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Type parameter Equality support Required not supported for type parameters</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-4152.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-4152.dfy.rs.check
new file mode 100644
index 00000000000..7d6c2fd331e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-4152.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Type name for ORDINAL \(Microsoft_dDafny_dBigOrdinalType\)</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-4233.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-4233.dfy.rs.check
new file mode 100644
index 00000000000..3b4eb808140
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-4233.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0369]: cannot divide `Rc<num_rational::Ratio<BigInt>>` by `Rc<num_rational::Ratio<BigInt>>`
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-443.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-443.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-443.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-446.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-446.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-446.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-446a.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-446a.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-446a.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-446b.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-446b.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-446b.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-452.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-452.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-452.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-452c.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-452c.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-452c.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-4939c.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-4939c.dfy.rs.check
new file mode 100644
index 00000000000..f12da961eee
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-4939c.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Traits</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-506.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-506.dfy.rs.check
new file mode 100644
index 00000000000..66736e40df8
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-506.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>MultiSelectLValue</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-5065.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-5065.dfy.rs.check
new file mode 100644
index 00000000000..d59836f7d8e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-5065.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-5092.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-5092.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-5092.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-5238.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-5238.dfy.rs.check
new file mode 100644
index 00000000000..bcc0c6e5468
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-5238.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0277]: the trait bound `Sequence<DafnyChar>: Default` is not satisfied
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-5285.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-5285.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-5285.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-532.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-532.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-532.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-549.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-549.dfy.rs.check
new file mode 100644
index 00000000000..f12da961eee
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-549.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Traits</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-610.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-610.dfy.rs.check
new file mode 100644
index 00000000000..d59836f7d8e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-610.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-674.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-674.dfy.rs.check
new file mode 100644
index 00000000000..d59836f7d8e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-674.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-684.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-684.dfy.rs.check
new file mode 100644
index 00000000000..d59836f7d8e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-684.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-686.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-686.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-686.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697.dfy.rs.check
new file mode 100644
index 00000000000..158d9484360
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>QuantifierExpr</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697b.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697b.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697b.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697d.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697d.dfy.rs.check
new file mode 100644
index 00000000000..158d9484360
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697d.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>QuantifierExpr</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697e.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697e.dfy.rs.check
new file mode 100644
index 00000000000..158d9484360
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697e.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>QuantifierExpr</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697f.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697f.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697f.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697g.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697g.dfy.rs.check
new file mode 100644
index 00000000000..fbb03b77111
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697g.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.NullReferenceException: Object reference not set to an instance of an object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697j.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697j.dfy.rs.check
new file mode 100644
index 00000000000..fbb03b77111
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697j.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.NullReferenceException: Object reference not set to an instance of an object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697k.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697k.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-697k.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-698.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-698.dfy.rs.check
new file mode 100644
index 00000000000..158d9484360
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-698.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>QuantifierExpr</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-698b.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-698b.dfy.rs.check
new file mode 100644
index 00000000000..158d9484360
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-698b.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>QuantifierExpr</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-701.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-701.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-701.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-731.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-731.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-731.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-731b.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-731b.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-731b.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-784.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-784.dfy.rs.check
new file mode 100644
index 00000000000..d59836f7d8e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-784.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-817.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-817.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-817.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-817a.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-817a.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-817a.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-859.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-859.dfy.rs.check
new file mode 100644
index 00000000000..d59836f7d8e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-859.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-864rr.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-864rr.dfy.rs.check
new file mode 100644
index 00000000000..3735a1af931
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-864rr.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error: missing angle brackets in associated item path
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-953.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-953.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/git-issue-953.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-2928.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-2928.dfy.rs.check
new file mode 100644
index 00000000000..d59836f7d8e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-2928.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-3766-a.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-3766-a.dfy.rs.check
new file mode 100644
index 00000000000..245a2e0f93d
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-3766-a.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0277]: the trait bound `Rc<Tree>: DafnyType` is not satisfied
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-3766-b.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-3766-b.dfy.rs.check
new file mode 100644
index 00000000000..245a2e0f93d
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-3766-b.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0277]: the trait bound `Rc<Tree>: DafnyType` is not satisfied
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-3766-c.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-3766-c.dfy.rs.check
new file mode 100644
index 00000000000..245a2e0f93d
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-3766-c.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0277]: the trait bound `Rc<Tree>: DafnyType` is not satisfied
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-3871.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-3871.dfy.rs.check
new file mode 100644
index 00000000000..186e8dcb2c2
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-3871.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0070]: invalid left-hand side of assignment
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-3874.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-3874.dfy.rs.check
new file mode 100644
index 00000000000..ddab6a3cd43
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-3874.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>EmitIndexCollectionUpdate for multiset<bool></i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-4483.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-4483.dfy.rs.check
new file mode 100644
index 00000000000..b87489fa29c
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/git-issues/github-issue-4483.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0433]: failed to resolve: use of undeclared crate or module `num`
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/hofs/Compilation.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/hofs/Compilation.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/hofs/Compilation.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/hofs/Fold.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/hofs/Fold.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/hofs/Fold.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/hofs/Renaming.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/hofs/Renaming.dfy.rs.check
new file mode 100644
index 00000000000..b216498bb86
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/hofs/Renaming.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0782]: trait objects must include the `dyn` keyword
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/hofs/TreeMapSimple.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/hofs/TreeMapSimple.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/hofs/TreeMapSimple.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/hofs/VectorUpdate.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/hofs/VectorUpdate.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/hofs/VectorUpdate.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/hofs/WhileLoop.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/hofs/WhileLoop.dfy.rs.check
new file mode 100644
index 00000000000..d59836f7d8e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/hofs/WhileLoop.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/metatests/ConsistentWhenSupported.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/metatests/ConsistentWhenSupported.dfy.rs.check
new file mode 100644
index 00000000000..94cce2fbf30
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/metatests/ConsistentWhenSupported.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Iterators</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/metatests/OutputEncoding.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/metatests/OutputEncoding.dfy.rs.check
new file mode 100644
index 00000000000..d59836f7d8e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/metatests/OutputEncoding.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/patterns/OrPatterns.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/patterns/OrPatterns.dfy.rs.check
new file mode 100644
index 00000000000..347af0cf800
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/patterns/OrPatterns.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0277]: can't compare `&DafnyInt` with `DafnyInt`
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/patterns/PatternMatching.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/patterns/PatternMatching.dfy.rs.check
new file mode 100644
index 00000000000..7ba64d0e832
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/patterns/PatternMatching.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Coercion</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/stdlibs/StandardLibraries.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/stdlibs/StandardLibraries.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/stdlibs/StandardLibraries.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/traits/GeneralTraitsCompile.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/traits/GeneralTraitsCompile.dfy.rs.check
new file mode 100644
index 00000000000..54c971c04bc
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/traits/GeneralTraitsCompile.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Unknown buildable type: NULL
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/traits/NonReferenceTraitsCompile.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/traits/NonReferenceTraitsCompile.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/traits/NonReferenceTraitsCompile.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/traits/TraitCompile.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/traits/TraitCompile.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/traits/TraitCompile.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/traits/TraitExample.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/traits/TraitExample.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/traits/TraitExample.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/traits/Traits-Fields.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/traits/Traits-Fields.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/traits/Traits-Fields.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/traits/TraitsMultipleInheritance.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/traits/TraitsMultipleInheritance.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/traits/TraitsMultipleInheritance.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodechars/comp/Arrays.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodechars/comp/Arrays.dfy.rs.check
new file mode 100644
index 00000000000..66736e40df8
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodechars/comp/Arrays.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>MultiSelectLValue</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodechars/comp/Collections.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodechars/comp/Collections.dfy.rs.check
new file mode 100644
index 00000000000..3dec7f442bb
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodechars/comp/Collections.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>EmitIndexCollectionUpdate for multiset<uint32></i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodechars/comp/Comprehensions.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodechars/comp/Comprehensions.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodechars/comp/Comprehensions.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodechars/comp/NativeNumbers.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodechars/comp/NativeNumbers.dfy.rs.check
new file mode 100644
index 00000000000..b87489fa29c
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodechars/comp/NativeNumbers.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0433]: failed to resolve: use of undeclared crate or module `num`
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodechars/comp/Numbers.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodechars/comp/Numbers.dfy.rs.check
new file mode 100644
index 00000000000..fbb03b77111
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodechars/comp/Numbers.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.NullReferenceException: Object reference not set to an instance of an object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodechars/git-issues/github-issue-2928.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodechars/git-issues/github-issue-2928.dfy.rs.check
new file mode 100644
index 00000000000..d59836f7d8e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodechars/git-issues/github-issue-2928.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: error[E0308]: mismatched types
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodecharsFalse/comp/Collections.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodecharsFalse/comp/Collections.dfy.rs.check
new file mode 100644
index 00000000000..1132949004e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodecharsFalse/comp/Collections.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Cannot\ assign\ null\ value\ to\ variable</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodecharsFalse/comp/Comprehensions.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodecharsFalse/comp/Comprehensions.dfy.rs.check
new file mode 100644
index 00000000000..323dbedbafa
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodecharsFalse/comp/Comprehensions.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK-L: Unhandled exception: System.InvalidOperationException: Operation is not valid due to the current state of the object.
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodecharsFalse/comp/NativeNumbers.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodecharsFalse/comp/NativeNumbers.dfy.rs.check
new file mode 100644
index 00000000000..1132949004e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodecharsFalse/comp/NativeNumbers.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Cannot\ assign\ null\ value\ to\ variable</i>.*
\ No newline at end of file
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodecharsFalse/git-issues/github-issue-2928.dfy.rs.check b/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodecharsFalse/git-issues/github-issue-2928.dfy.rs.check
new file mode 100644
index 00000000000..1132949004e
--- /dev/null
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/unicodecharsFalse/git-issues/github-issue-2928.dfy.rs.check
@@ -0,0 +1 @@
+// CHECK: .*<i>Cannot\ assign\ null\ value\ to\ variable</i>.*
\ No newline at end of file
diff --git a/Source/TestDafny/MultiBackendTest.cs b/Source/TestDafny/MultiBackendTest.cs
index 3741df1f1b6..04be188e862 100644
--- a/Source/TestDafny/MultiBackendTest.cs
+++ b/Source/TestDafny/MultiBackendTest.cs
@@ -4,6 +4,7 @@
 using System.Text.RegularExpressions;
 using CommandLine;
 using Microsoft.Dafny;
+using Microsoft.Dafny.Compilers;
 using Microsoft.Dafny.Plugins;
 using XUnitExtensions;
 using XUnitExtensions.Lit;
@@ -57,6 +58,14 @@ public class MultiBackendTest {
   private readonly TextWriter output;
   private readonly TextWriter errorWriter;
 
+  private static readonly string[] CompilerFilter =
+    (Environment.GetEnvironmentVariable("DAFNY_INTEGRATION_TESTS_ONLY_COMPILERS") ?? "")
+    .Split(",")
+    .Where(name => name.Trim() != "").ToArray();
+  private static readonly string? IntegrationTestsRootDir =
+    Environment.GetEnvironmentVariable("DAFNY_INTEGRATION_TESTS_ROOT_DIR");
+  private static readonly bool UpdateTargetExpectFile = DiffCommand.UpdateExpectFile;
+
   public MultiBackendTest(TextReader input, TextWriter output, TextWriter errorWriter) {
     this.input = input;
     this.output = output;
@@ -184,23 +193,23 @@ await output.WriteLineAsync(
     var success = true;
     foreach (var plugin in plugins) {
       foreach (var compiler in plugin.GetCompilers(DafnyOptions.Default)) {
-        if (!compiler.IsStable) {
-          // Some tests still fail when using the lib back-end, for example due to disallowed assumptions being present in the test,
-          // Such as empty constructors with ensures clauses, generated from iterators
+        if (!compiler.IsStable || CompilerFilter.Any() && !CompilerFilter.Contains(compiler.TargetId)) {
           continue;
         }
 
         // Check for backend-specific exceptions (because of known bugs or inconsistencies)
         var expectedOutput = commonExpectedOutput;
         string? checkFile = null;
-        var expectFileForBackend = $"{options.TestFile}.{compiler.TargetId}.expect";
+        var expectFileForBackend = ExpectFileForBackend(options, compiler);
         if (File.Exists(expectFileForBackend)) {
           expectedOutput = await File.ReadAllTextAsync(expectFileForBackend);
         }
 
-        var checkFileForBackend = $"{options.TestFile}.{compiler.TargetId}.check";
+        var checkFileForBackend = CheckFileForBackend(options, compiler);
         if (File.Exists(checkFileForBackend)) {
           checkFile = checkFileForBackend;
+        } else if (GetSourceCheckFile(checkFileForBackend, out var originalCheckFile)) {
+          checkFile = originalCheckFile;
         }
 
         var result = await RunWithCompiler(options, compiler, expectedOutput, checkFile);
@@ -230,6 +239,25 @@ await output.WriteLineAsync(
     return -1;
   }
 
+  private static bool GetSourceCheckFile(string checkFileForBackend, out string originalCheckFile) {
+    if (IntegrationTestsRootDir is var x && !string.IsNullOrEmpty(x)
+        && Path.Combine(x, checkFileForBackend) is var s && File.Exists(s)) {
+      originalCheckFile = s;
+      return true;
+    } else {
+      originalCheckFile = "";
+      return false;
+    }
+  }
+
+  private static string CheckFileForBackend(ForEachCompilerOptions options, IExecutableBackend compiler) {
+    return $"{options.TestFile}.{compiler.TargetId}.check";
+  }
+
+  private static string ExpectFileForBackend(ForEachCompilerOptions options, IExecutableBackend compiler) {
+    return $"{options.TestFile}.{compiler.TargetId}.expect";
+  }
+
   public async Task<int> ForEachResolver(ForEachResolverOptions options) {
     // We also use --(r|b)print to catch bugs with valid but unprintable programs.
     string fileName = Path.GetFileName(options.TestFile!);
@@ -305,7 +333,8 @@ private static bool OptionAppliesToVerifyCommand(string option) {
     return !compileOptions.Contains(name);
   }
 
-  private async Task<int> RunWithCompiler(ForEachCompilerOptions options, IExecutableBackend backend, string expectedOutput, string? checkFile, bool includeRuntime = true) {
+  private async Task<int> RunWithCompiler(ForEachCompilerOptions options, IExecutableBackend backend, string expectedOutput,
+    string? checkFile, bool includeRuntime = true) {
     await output.WriteAsync($"Executing on {backend.TargetName}");
     if (!includeRuntime) {
       await output.WriteAsync(" (with --include-runtime:false)");
@@ -317,12 +346,14 @@ private async Task<int> RunWithCompiler(ForEachCompilerOptions options, IExecuta
     // to ensure that all artifacts are put in a dedicated directory,
     // which just "<user temp directory>/<random name>" would not.
     var randomName = Path.ChangeExtension(Path.GetRandomFileName(), null);
+    // Attempts at making this path longer will likely crash javac on Windows with issues like "path too long"
     var tempOutputDirectory = Path.Combine(Path.GetTempPath(), randomName, randomName);
     Directory.CreateDirectory(tempOutputDirectory);
 
     IEnumerable<string> dafnyArgs = new List<string> {
       "run",
       "--no-verify",
+      "--emit-uncompilable-code",
       $"--target:{backend.TargetId}",
       $"--build:{tempOutputDirectory}",
       options.TestFile!,
@@ -338,15 +369,49 @@ private async Task<int> RunWithCompiler(ForEachCompilerOptions options, IExecuta
       dafnyArgs = dafnyArgs.Concat(new[] { "--include-runtime:false", "--input", runtimePath });
     }
 
-    var (exitCode, outputString, error) = await RunDafny(options.DafnyCliPath, dafnyArgs);
+    int exitCode;
+    string outputString;
+    string error;
+    try {
+      (exitCode, outputString, error) = await RunDafny(options.DafnyCliPath, dafnyArgs);
+    } catch (Exception e) {
+      // When DAFNY_INTEGRATION_TESTS_IN_PROCESS is set to true, Dafny runs in the same process
+      // so we catch the exception manually
+      (exitCode, outputString, error) = (3, "", e.ToString());
+    }
+
     var compilationOutputPrior = new Regex("\r?\nDafny program verifier[^\r\n]*\r?\n").Match(outputString);
     if (compilationOutputPrior.Success) {
       outputString = outputString.Remove(0, compilationOutputPrior.Index + compilationOutputPrior.Length);
     }
 
+    var diffMessage = exitCode == 0 ? AssertWithDiff.GetDiffMessage(expectedOutput, outputString) : null;
+    if (checkFile == null && exitCode != 0) {
+      if (UpdateTargetExpectFile) {
+        if (string.IsNullOrEmpty(IntegrationTestsRootDir)) {
+          await output.WriteLineAsync(
+            "DAFNY_INTEGRATION_TESTS_UPDATE_EXPECT_FILE is true but DAFNY_INTEGRATION_TESTS_ROOT_DIR is not set");
+        } else {
+          return await UpdateBackendCheckFile(options, backend, expectedOutput, outputString, error, exitCode, false);
+        }
+      }
+    }
+
     if (exitCode == 0) {
-      var diffMessage = AssertWithDiff.GetDiffMessage(expectedOutput, outputString);
       if (diffMessage == null) {
+        if (checkFile != null) {
+          // The test now works, we delete the check file
+          if (UpdateTargetExpectFile) {
+            if ((IntegrationTestsRootDir ?? "") == "") {
+              await output.WriteLineAsync(
+                "DAFNY_INTEGRATION_TESTS_UPDATE_EXPECT_FILE is true but DAFNY_INTEGRATION_TESTS_ROOT_DIR is not set");
+            } else {
+              var sourcePath = Path.Join(IntegrationTestsRootDir,
+                CheckFileForBackend(options, backend));
+              File.Delete(sourcePath);
+            }
+          }
+        }
         return 0;
       }
 
@@ -358,6 +423,10 @@ private async Task<int> RunWithCompiler(ForEachCompilerOptions options, IExecuta
     if (error == "" && OnlyAllowedOutputLines(backend, outputString)) {
       return 0;
     }
+    // If we hit errors, check for known unsupported features or bugs for this compilation target
+    if (outputString == "" && OnlyAllowedOutputLines(backend, error)) {
+      return 0;
+    }
 
     if (checkFile != null) {
       var outputLines = new List<string>();
@@ -367,8 +436,17 @@ private async Task<int> RunWithCompiler(ForEachCompilerOptions options, IExecuta
       var checkDirectives = OutputCheckCommand.ParseCheckFile(checkFile);
       var checkResult = OutputCheckCommand.Execute(errorWriter, outputLines, checkDirectives);
       if (checkResult != 0) {
-        await output.WriteLineAsync($"OutputCheck on {checkFile} failed:");
-        await output.WriteLineAsync("Error:");
+        await output.WriteLineAsync($"OutputCheck on {checkFile} failed. Output was:");
+        await output.WriteLineAsync(string.Join("\n", outputLines));
+
+        if (UpdateTargetExpectFile) {
+          if (string.IsNullOrEmpty(IntegrationTestsRootDir)) {
+            await output.WriteLineAsync(
+              "DAFNY_INTEGRATION_TESTS_UPDATE_EXPECT_FILE is true but DAFNY_INTEGRATION_TESTS_ROOT_DIR is not set");
+          } else {
+            return await UpdateBackendCheckFile(options, backend, expectedOutput, outputString, error, exitCode, true);
+          }
+        }
       }
 
       return checkResult;
@@ -381,6 +459,61 @@ private async Task<int> RunWithCompiler(ForEachCompilerOptions options, IExecuta
     return exitCode;
   }
 
+  private async Task<int> UpdateBackendCheckFile(ForEachCompilerOptions options, IExecutableBackend backend,
+    string expectedOutput, string outputString, string error, int exitCode, bool expectedCheckFile) {
+    var sourcePath = Path.Join(IntegrationTestsRootDir,
+      CheckFileForBackend(options, backend));
+    // outputString == error iff something crashed
+    var contentCheck = outputString == error ? outputString.Trim() : (outputString + "\n" + error).Trim();
+    var checkOutput = "";
+    var shouldSuffice = true;
+    if (contentCheck == "") {
+      shouldSuffice = false;
+      checkOutput = string.Join("\n",
+        expectedOutput.Split("\n").Select(line => "// CHECK-NOT: " + line));
+    } else {
+      // A few heuristics to create the .ext.check files
+      if (new Regex("<i>.*?</i>").Matches(contentCheck) is { Count: > 0 } m1) {
+        checkOutput = "// CHECK: .*" + Regex.Escape(m1[0].Value.Trim()) + ".*";
+      } else if (new Regex("<i>.*").Matches(contentCheck) is { Count: > 0 } m2) {
+        checkOutput = "// CHECK: .*" + Regex.Escape(m2[0].Value.Trim()) + ".*";
+      } else if (new Regex("^Unhandled exception.*$", RegexOptions.Multiline).Matches(contentCheck) is { Count: > 0 } m3) {
+        checkOutput = "// CHECK-L: " + m3[0].Value.Trim();
+      } else if (new Regex("^error: failed to get `as-any` as a dependency of package$", RegexOptions.Multiline).Matches(contentCheck)
+                 is { Count: > 0 } m4) {
+        checkOutput = "// CHECK: .*error: failed to get `as-any` as a dependency.*";
+      } else {
+        shouldSuffice = false;
+        checkOutput = string.Join("\n",
+          contentCheck.Split("\n")
+            .Where(line => line != "")
+            .Select(line => "// CHECK-L: " + line));
+      }
+    }
+
+    if (!File.Exists(sourcePath) || expectedCheckFile) {
+      await File.WriteAllTextAsync(sourcePath, checkOutput);
+      if (shouldSuffice) {
+        await output.WriteLineAsync(
+          $"The new .check file {sourcePath} should capture this error. Please relaunch this test");
+      } else {
+        await output.WriteLineAsync(
+          $"Please modify the new check file {sourcePath} so that it's valid no matter what.");
+      }
+    } else {
+      await output.WriteLineAsync(
+        $"Apparently, the file {sourcePath} already exists so the process isn't going to create one " +
+        $" despite DAFNY_INTEGRATION_TESTS_UPDATE_EXPECT_FILE set to true and the file {CheckFileForBackend(options, backend)} not existing.\n" +
+        " To avoid this message, please rebuild the solution (modifying a .cs file or a .dfy can help).");
+    }
+
+    await output.WriteLineAsync(outputString);
+    await output.WriteLineAsync("Error:");
+    await output.WriteLineAsync(error);
+
+    return exitCode;
+  }
+
   public static IList<string> ReadAllLines(string s) {
     var result = new List<string>();
     var reader = new StringReader(s);
@@ -413,6 +546,15 @@ public static IList<string> ReadAllLines(string s) {
   }
 
   private static bool OnlyAllowedOutputLines(IExecutableBackend backend, string output) {
+    var prefixRecoverable = output.IndexOf(typeof(UnsupportedInvalidOperationException).FullName!, StringComparison.Ordinal);
+    if (prefixRecoverable > 0) {
+      return true;
+    }
+    prefixRecoverable = output.IndexOf(typeof(RecoverableUnsupportedFeatureException).FullName!, StringComparison.Ordinal);
+    if (prefixRecoverable > 0) {
+      return true;
+    }
+
     using StringReader sr = new StringReader(output);
     if (output == "") {
       return false;
@@ -449,6 +591,9 @@ private static bool IsAllowedOutputLine(IExecutableBackend backend, string line)
     }
 
     var featureDescription = line[(prefixIndex + UnsupportedFeatureException.MessagePrefix.Length)..];
+    if (featureDescription.IndexOf(RecoverableUnsupportedFeatureException.MessageSuffix) is var i and > 0) {
+      featureDescription = featureDescription[..i];
+    }
     var feature = FeatureDescriptionAttribute.ForDescription(featureDescription);
     if (backend.UnsupportedFeatures.Contains(feature)) {
       return true;
diff --git a/Source/XUnitExtensions/Lit/DiffCommand.cs b/Source/XUnitExtensions/Lit/DiffCommand.cs
index fbc0f868936..0fc0d11e4a9 100644
--- a/Source/XUnitExtensions/Lit/DiffCommand.cs
+++ b/Source/XUnitExtensions/Lit/DiffCommand.cs
@@ -11,7 +11,7 @@ namespace XUnitExtensions.Lit {
   /// because 'diff' does not exist on Windows.
   /// </summary>
   public class DiffCommand : ILitCommand {
-    public static readonly bool UpdateExpectFile = false;
+    public static readonly bool UpdateExpectFile = Environment.GetEnvironmentVariable("DAFNY_INTEGRATION_TESTS_UPDATE_EXPECT_FILE") == "true";
 
     public string ExpectedPath { get; }
     public string ActualPath { get; }
diff --git a/Source/XUnitExtensions/Lit/OutputCheckCommand.cs b/Source/XUnitExtensions/Lit/OutputCheckCommand.cs
index be9bd64095d..9a89c5ec9a0 100644
--- a/Source/XUnitExtensions/Lit/OutputCheckCommand.cs
+++ b/Source/XUnitExtensions/Lit/OutputCheckCommand.cs
@@ -236,7 +236,8 @@ public static int Execute(TextWriter errorWriter, IEnumerable<string> linesToChe
         } else {
           var enumerator = notCheckingEnumerator ?? lineEnumerator;
           if (!directive.FindMatch(enumerator)) {
-            errorWriter.WriteLine($"ERROR: Could not find a match for {directive}");
+            errorWriter.WriteLine($"ERROR: Could not find any match for {directive}. The output is above.");
+            errorWriter.WriteLine();
             return 1;
           }
 
diff --git a/Source/XUnitExtensions/Lit/ShellLitCommand.cs b/Source/XUnitExtensions/Lit/ShellLitCommand.cs
index 3a3cd052ecc..5ef13c28317 100644
--- a/Source/XUnitExtensions/Lit/ShellLitCommand.cs
+++ b/Source/XUnitExtensions/Lit/ShellLitCommand.cs
@@ -38,7 +38,14 @@ public async Task<int> Execute(TextReader inputReader,
 
       process.StartInfo.EnvironmentVariables.Clear();
       foreach (var passthrough in passthroughEnvironmentVariables) {
-        process.StartInfo.EnvironmentVariables.Add(passthrough, Environment.GetEnvironmentVariable(passthrough));
+        if (passthrough.Contains('=')) {
+          var parts = passthrough.Split('=');
+          var name = parts[0];
+          var value = parts[1];
+          process.StartInfo.EnvironmentVariables.Add(name, value);
+        } else {
+          process.StartInfo.EnvironmentVariables.Add(passthrough, Environment.GetEnvironmentVariable(passthrough));
+        }
       }
 
       // Getting console encodings right is tricky on Windows.
diff --git a/docs/DafnyRef/Options.txt b/docs/DafnyRef/Options.txt
index cac09ed2ed4..149404f58f0 100644
--- a/docs/DafnyRef/Options.txt
+++ b/docs/DafnyRef/Options.txt
@@ -180,6 +180,11 @@ Usage: dafny [ option ... ] [ filename ... ]
   /verifyAllModules
       Verify modules that come from an include directive.
   
+  /emitUncompilableCode
+      Allow compilers to emit uncompilable code that usually contain useful
+      information about what feature is missing, rather than
+      stopping on the first problem
+  
   /separateModuleOutput
       Output verification results for each module separately, rather than
       aggregating them after they are all finished.
diff --git a/docs/DafnyRef/integration- rust/IntegrationRust.md b/docs/DafnyRef/integration- rust/IntegrationRust.md
new file mode 100644
index 00000000000..4730fa6eb0d
--- /dev/null
+++ b/docs/DafnyRef/integration- rust/IntegrationRust.md	
@@ -0,0 +1,86 @@
+---
+title: Integrating Dafny and Rust code
+---
+
+## THIS FILE IS A WORK IN PROGRESS, IT CAN BE MODIFIED AT ANY TIME WITHOUT NOTICE
+** The Dafny-to-Rust compiler is not an officially supported backend yet**
+
+The `dafny build` and `dafny run` currently translate a entry Dafny program `<program>.dfy`
+or project file like `program/dfyconfig.toml` into the following architecture,
+where the program depends on the Dafny runtime crate explicitly.
+```
+program-rust/   // Can be changed with --output:
+  runtime/
+    src/
+      lib.rs    // The Dafny runtime
+    cargo.lock
+    cargo.toml
+  src/
+    program.rs  // The generated program
+  cargo.lock
+  cargo.toml
+```
+
+With `dafny translate`, only `program-rust/src/program.rs` is emitted.
+
+## **Matching Dafny and Rust types**
+
+It's worth recalling that Rust has two semantics for variables:
+
+* *Copy semantics* are the one everyone used to `C#`, `Java`, `JavaScript`, `Go` understand.
+At run-time, it means the actual bits of memory are copied from one location to the other.
+Primitive types like `bool`, `u8`, `i8`, `u16`... but also any references `& T`, `&mut T`, `*const T` or `*mut T` have copy semantics.
+* *Move semantics* or *owned semantics* indicate that once a variable or a field is used without borrowing, it can no longer be used afterwards. These are the semantics that allow Rust to forget the garbage collector, by cleaning up resources Rust can statically determine they are not longer used.
+Move semantics are the default for any type that does not implement the `Copy` trait.
+
+Dafny has only Copy semantics, which as said offer a straight encoding for primitive types and reference types.
+However, immutable types and datatypes are a bit harder, because variables containing them would have
+move semantics by default. Fortunately, there exist a method `Cloneable::clone(&self)` that borrows an object of a struct or enum that implements the trait `Clone` and can create a duplicate. That method is a no-op for types implementing the `Copy` trait.
+
+Hence, whenever a variable with move semantics (borrowed or owned) is used in a place that expects an owned value (such as an addition), Dafny inserts a `.Clone()` call in Rust so that the result can be used independently of the variable. Moreover, to pass a variable to any function, it must be either borrowed (prefixed with `&`) or cloned, unless Dafny could theoretically determine it's the last occurrence of this variable.
+
+For maximum flexibility, Dafny follows these rules to encode types in Rust:
+- Function parameters always take primitive types without borrowing them (`bool`, `u32`, etc.) 
+- Function parameters always borrows variables of other types (`DafnyString`, structs, etc.), because
+  borrowing is always cheaper than cloning for non-Copy types.  
+  Open question: There are at least two more possible alternatives
+  - We could actually have parameters be always owned, which require `.clone()` also to be used at the call site
+  - We could have parameter attributes like `{:rc_owned true}` so that users can choose which API to precisely give to their functions.
+- Functions always return an owned type, otherwise we would need to have an automated theory about lifetimes of returned borrowed references, which Dafny does not support. Moreover, borrowing a variable makes its lifetime not `'static`, so it's not possible to use that trait.
+- `& T` and `&mut T` annotations only appear at the top-level of types, never nested.
+- Classes types are encoded in raw pointers, and a deallocation statement will be made available.
+
+|-------------------------------|-----------------------------|
+|  Dafny type                   |   Rust type                 |
+|-------------------------------|-----------------------------|
+| `bool`                        | `bool`                      |
+| `int`                         | `DafnyInt` (wrapper around `Rc<num::BigInt>`)   |
+| `int64`                       | `i64`                       |
+| `int32`                       | `i32`                       |
+| `int16`                       | `i16`                       |
+| `int8`                        | `i8`                        |
+| `char`                        | `char` OR `u16`             |
+| `bitvector`                   | appropriate `u8` ... `u128` type  |
+| `ORDINAL`                     | `DafnyInt` - TODO           |
+| `real`                        | `num::BigRational` (will move to DafnyRational) |
+|                               | `f64`                       |
+| `string`                      | `Sequence<DafnyChar>`       |
+|                               | or `Sequence<DafnyCharUTF16>`  |
+| `C`, `C?` (for class, iterator C) | `*mut C`                |
+| (trait) `T`                   | (trait) `*mut dyn T`        |
+| datatype, codatatype `D`      | `Rc<D>`                     |
+|                               | or `D` with the option `{:rust_rc false}` |
+| subset type                   | same as base type           |
+| `newtype T = u: U`            | `struct T(U)`               |
+|                               | or optimized to `u8`..`i128`|
+| `(T1, T2...)`                 | `(T1, T2...)`               |
+| `array<T>`                    | `*mut [T]`                  |
+| `array2<T>`                   | `*mut array2<T>`            |
+| `seq<T>`                      | `Sequence<T: DafnyType>` (*)|
+| `set<T>`, `iset<T>`           | `Set<T: DafnyTypeEq>` (*)      |
+| `multiset<T>`                 | `MultiSet<T: DafnyTypeEq>` (*) |
+| `map<T,U>`, `imap<T,U>`       | `Map<T: DafnyTypeEq, U: DafnyTypeEq>` (*) |
+| function (arrow) types        | `Rc<dyn Fn(...) -> ...>`    |
+
+(*) Defined in the Dafny runtime
+
diff --git a/docs/dev/news/5081.feat b/docs/dev/news/5081.feat
new file mode 100644
index 00000000000..72b10264817
--- /dev/null
+++ b/docs/dev/news/5081.feat
@@ -0,0 +1,3 @@
+Experimental Dafny-to-Rust compiler development
+- Supports emitting code even if malformed with option `--emit-uncompilable-code`.
+- Supports for immutable collections and operators
\ No newline at end of file