Merge pull request rust-lang#5186 from calebcartwright/subtree-sync-2022-01-23

sync subtree

Author: calebcartwright

Configurations.md

@@ -929,9 +929,9 @@ fn add_one(x: i32) -> i32 {
 ## `format_generated_files`
 
 Format generated files. A file is considered generated
-if any of the first five lines contains `@generated` marker.
+if any of the first five lines contain a `@generated` comment marker.
 
-- **Default value**: `false`
+- **Default value**: `true`
 - **Possible values**: `true`, `false`
 - **Stable**: No (tracking issue: [#5080](https://github.com/rust-lang/rustfmt/issues/5080))
 

rust-toolchain

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2021-12-29"
+channel = "nightly-2022-01-23"
 components = ["rustc-dev"]

src/config/mod.rs

@@ -138,7 +138,7 @@ create_config! {
     inline_attribute_width: usize, 0, false,
         "Write an item and its attribute on the same line \
         if their combined width is below a threshold";
-    format_generated_files: bool, false, false, "Format generated files";
+    format_generated_files: bool, true, false, "Format generated files";
 
     // Options that can change the source code beyond whitespace/blocks (somewhat linty things)
     merge_derives: bool, true, true, "Merge multiple `#[derive(...)]` into a single one";
@@ -606,7 +606,7 @@ blank_lines_lower_bound = 0
 edition = "2015"
 version = "One"
 inline_attribute_width = 0
-format_generated_files = false
+format_generated_files = true
 merge_derives = true
 use_try_shorthand = false
 use_field_init_shorthand = false

src/expr.rs

@@ -334,9 +334,7 @@ pub(crate) fn format_expr(
         // satisfy our width restrictions.
         // Style Guide RFC for InlineAsm variant pending
         // https://github.com/rust-dev-tools/fmt-rfcs/issues/152
-        ast::ExprKind::LlvmInlineAsm(..) | ast::ExprKind::InlineAsm(..) => {
-            Some(context.snippet(expr.span).to_owned())
-        }
+        ast::ExprKind::InlineAsm(..) => Some(context.snippet(expr.span).to_owned()),
         ast::ExprKind::TryBlock(ref block) => {
             if let rw @ Some(_) =
                 rewrite_single_line_block(context, "try ", block, Some(&expr.attrs), None, shape)

src/formatting.rs

@@ -80,7 +80,9 @@ fn should_skip_module<T: FormatHandler>(
         return true;
     }
 
-    if !config.format_generated_files() {
+    // FIXME(calebcartwright) - we need to determine how we'll handle the
+    // `format_generated_files` option with stdin based input.
+    if !input_is_stdin && !config.format_generated_files() {
         let source_file = context.parse_session.span_to_file_contents(module.span);
         let src = source_file.src.as_ref().expect("SourceFile without src");
 

src/lib.rs

@@ -3,6 +3,7 @@
 #![warn(unreachable_pub)]
 #![recursion_limit = "256"]
 #![allow(clippy::match_like_matches_macro)]
+#![allow(unreachable_pub)]
 
 #[macro_use]
 extern crate derive_new;

src/test/mod.rs

@@ -557,6 +557,27 @@ fn stdin_disable_all_formatting_test() {
     assert_eq!(input, String::from_utf8(output.stdout).unwrap());
 }
 
+#[test]
+fn stdin_generated_files_issue_5172() {
+    init_log();
+    let input = Input::Text("//@generated\nfn   main() {}".to_owned());
+    let mut config = Config::default();
+    config.set().emit_mode(EmitMode::Stdout);
+    config.set().format_generated_files(false);
+    config.set().newline_style(NewlineStyle::Unix);
+    let mut buf: Vec<u8> = vec![];
+    {
+        let mut session = Session::new(config, Some(&mut buf));
+        session.format(input).unwrap();
+        assert!(session.has_no_errors());
+    }
+    // N.B. this should be changed once `format_generated_files` is supported with stdin
+    assert_eq!(
+        String::from_utf8(buf).unwrap(),
+        "<stdin>:\n\n//@generated\nfn main() {}\n",
+    );
+}
+
 #[test]
 fn format_lines_errors_are_reported() {
     init_log();

src/types.rs

@@ -1,7 +1,7 @@
 use std::iter::ExactSizeIterator;
 use std::ops::Deref;
 
-use rustc_ast::ast::{self, FnRetTy, Mutability};
+use rustc_ast::ast::{self, FnRetTy, Mutability, Term};
 use rustc_ast::ptr;
 use rustc_span::{symbol::kw, BytePos, Pos, Span};
 
@@ -141,7 +141,7 @@ pub(crate) enum SegmentParam<'a> {
     Const(&'a ast::AnonConst),
     LifeTime(&'a ast::Lifetime),
     Type(&'a ast::Ty),
-    Binding(&'a ast::AssocTyConstraint),
+    Binding(&'a ast::AssocConstraint),
 }
 
 impl<'a> SegmentParam<'a> {
@@ -176,9 +176,9 @@ impl<'a> Rewrite for SegmentParam<'a> {
     }
 }
 
-impl Rewrite for ast::AssocTyConstraint {
+impl Rewrite for ast::AssocConstraint {
     fn rewrite(&self, context: &RewriteContext<'_>, shape: Shape) -> Option<String> {
-        use ast::AssocTyConstraintKind::{Bound, Equality};
+        use ast::AssocConstraintKind::{Bound, Equality};
 
         let mut result = String::with_capacity(128);
         result.push_str(rewrite_ident(context, self.ident));
@@ -206,11 +206,14 @@ impl Rewrite for ast::AssocTyConstraint {
     }
 }
 
-impl Rewrite for ast::AssocTyConstraintKind {
+impl Rewrite for ast::AssocConstraintKind {
     fn rewrite(&self, context: &RewriteContext<'_>, shape: Shape) -> Option<String> {
         match self {
-            ast::AssocTyConstraintKind::Equality { ty } => ty.rewrite(context, shape),
-            ast::AssocTyConstraintKind::Bound { bounds } => bounds.rewrite(context, shape),
+            ast::AssocConstraintKind::Equality { term } => match term {
+                Term::Ty(ty) => ty.rewrite(context, shape),
+                Term::Const(c) => c.rewrite(context, shape),
+            },
+            ast::AssocConstraintKind::Bound { bounds } => bounds.rewrite(context, shape),
         }
     }
 }

src/utils.rs

@@ -507,7 +507,6 @@ pub(crate) fn is_block_expr(context: &RewriteContext<'_>, expr: &ast::Expr, repr
         | ast::ExprKind::Err
         | ast::ExprKind::Field(..)
         | ast::ExprKind::InlineAsm(..)
-        | ast::ExprKind::LlvmInlineAsm(..)
         | ast::ExprKind::Let(..)
         | ast::ExprKind::Path(..)
         | ast::ExprKind::Range(..)