Rollup of 8 pull requests

compiler/rustc_ast_pretty/src/pprust/state.rs

@@ -131,7 +131,7 @@ pub fn print_crate<'a>(
 
         // Currently, in Rust 2018 we don't have `extern crate std;` at the crate
         // root, so this is not needed, and actually breaks things.
-        if edition.rust_2015() {
+        if edition.is_rust_2015() {
             // `#![no_std]`
             let fake_attr = attr::mk_attr_word(g, ast::AttrStyle::Inner, sym::no_std, DUMMY_SP);
             s.print_attribute(&fake_attr);

compiler/rustc_borrowck/src/diagnostics/region_errors.rs

@@ -583,10 +583,12 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
         let err = FnMutError {
             span: *span,
             ty_err: match output_ty.kind() {
-                ty::Closure(_, _) => FnMutReturnTypeErr::ReturnClosure { span: *span },
                 ty::Generator(def, ..) if self.infcx.tcx.generator_is_async(*def) => {
                     FnMutReturnTypeErr::ReturnAsyncBlock { span: *span }
                 }
+                _ if output_ty.contains_closure() => {
+                    FnMutReturnTypeErr::ReturnClosure { span: *span }
+                }
                 _ => FnMutReturnTypeErr::ReturnRef { span: *span },
             },
         };
@@ -997,7 +999,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
     fn suggest_move_on_borrowing_closure(&self, diag: &mut Diagnostic) {
         let map = self.infcx.tcx.hir();
         let body_id = map.body_owned_by(self.mir_def_id());
-        let expr = &map.body(body_id).value;
+        let expr = &map.body(body_id).value.peel_blocks();
         let mut closure_span = None::<rustc_span::Span>;
         match expr.kind {
             hir::ExprKind::MethodCall(.., args, _) => {
@@ -1012,20 +1014,14 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
                     }
                 }
             }
-            hir::ExprKind::Block(blk, _) => {
-                if let Some(expr) = blk.expr {
-                    // only when the block is a closure
-                    if let hir::ExprKind::Closure(hir::Closure {
-                        capture_clause: hir::CaptureBy::Ref,
-                        body,
-                        ..
-                    }) = expr.kind
-                    {
-                        let body = map.body(*body);
-                        if !matches!(body.generator_kind, Some(hir::GeneratorKind::Async(..))) {
-                            closure_span = Some(expr.span.shrink_to_lo());
-                        }
-                    }
+            hir::ExprKind::Closure(hir::Closure {
+                capture_clause: hir::CaptureBy::Ref,
+                body,
+                ..
+            }) => {
+                let body = map.body(*body);
+                if !matches!(body.generator_kind, Some(hir::GeneratorKind::Async(..))) {
+                    closure_span = Some(expr.span.shrink_to_lo());
                 }
             }
             _ => {}

compiler/rustc_borrowck/src/type_check/mod.rs

@@ -1484,7 +1484,10 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
                 }
             }
             None => {
-                if !sig.output().is_privately_uninhabited(self.tcx(), self.param_env) {
+                // The signature in this call can reference region variables,
+                // so erase them before calling a query.
+                let output_ty = self.tcx().erase_regions(sig.output());
+                if !output_ty.is_privately_uninhabited(self.tcx(), self.param_env) {
                     span_mirbug!(self, term, "call to converging function {:?} w/o dest", sig);
                 }
             }

compiler/rustc_error_messages/locales/en-US/parse.ftl

@@ -203,8 +203,9 @@ parse_inclusive_range_extra_equals = unexpected `=` after inclusive range
     .suggestion_remove_eq = use `..=` instead
     .note = inclusive ranges end with a single equals sign (`..=`)
 
-parse_inclusive_range_match_arrow = unexpected `=>` after open range
-    .suggestion_add_space = add a space between the pattern and `=>`
+parse_inclusive_range_match_arrow = unexpected `>` after inclusive range
+    .label = this is parsed as an inclusive range `..=`
+    .suggestion = add a space between the pattern and `=>`
 
 parse_inclusive_range_no_end = inclusive range with no end
     .suggestion_open_range = use `..` instead
@@ -535,8 +536,8 @@ parse_dot_dot_dot_range_to_pattern_not_allowed = range-to patterns with `...` ar
 
 parse_enum_pattern_instead_of_identifier = expected identifier, found enum pattern
 
-parse_dot_dot_dot_for_remaining_fields = expected field pattern, found `...`
-    .suggestion = to omit remaining fields, use one fewer `.`
+parse_dot_dot_dot_for_remaining_fields = expected field pattern, found `{$token_str}`
+    .suggestion = to omit remaining fields, use `..`
 
 parse_expected_comma_after_pattern_field = expected `,`
 

compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs

@@ -454,8 +454,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             None if let Some(e) = self.tainted_by_errors() => self.tcx.ty_error_with_guaranteed(e),
             None => {
                 bug!(
-                    "no type for node {}: {} in fcx {}",
-                    id,
+                    "no type for node {} in fcx {}",
                     self.tcx.hir().node_to_string(id),
                     self.tag()
                 );

compiler/rustc_hir_typeck/src/mem_categorization.rs

@@ -155,8 +155,7 @@ impl<'a, 'tcx> MemCategorizationContext<'a, 'tcx> {
             None if self.is_tainted_by_errors() => Err(()),
             None => {
                 bug!(
-                    "no type for node {}: {} in mem_categorization",
-                    id,
+                    "no type for node {} in mem_categorization",
                     self.tcx().hir().node_to_string(id)
                 );
             }

compiler/rustc_middle/src/hir/map/mod.rs

@@ -290,7 +290,7 @@ impl<'hir> Map<'hir> {
     #[track_caller]
     pub fn parent_id(self, hir_id: HirId) -> HirId {
         self.opt_parent_id(hir_id)
-            .unwrap_or_else(|| bug!("No parent for node {:?}", self.node_to_string(hir_id)))
+            .unwrap_or_else(|| bug!("No parent for node {}", self.node_to_string(hir_id)))
     }
 
     pub fn get_parent(self, hir_id: HirId) -> Node<'hir> {
@@ -1191,12 +1191,10 @@ fn upstream_crates(tcx: TyCtxt<'_>) -> Vec<(StableCrateId, Svh)> {
 }
 
 fn hir_id_to_string(map: Map<'_>, id: HirId) -> String {
-    let id_str = format!(" (hir_id={})", id);
-
     let path_str = |def_id: LocalDefId| map.tcx.def_path_str(def_id.to_def_id());
 
     let span_str = || map.tcx.sess.source_map().span_to_snippet(map.span(id)).unwrap_or_default();
-    let node_str = |prefix| format!("{} {}{}", prefix, span_str(), id_str);
+    let node_str = |prefix| format!("{id} ({prefix} `{}`)", span_str());
 
     match map.find(id) {
         Some(Node::Item(item)) => {
@@ -1225,18 +1223,18 @@ fn hir_id_to_string(map: Map<'_>, id: HirId) -> String {
                 ItemKind::TraitAlias(..) => "trait alias",
                 ItemKind::Impl { .. } => "impl",
             };
-            format!("{} {}{}", item_str, path_str(item.owner_id.def_id), id_str)
+            format!("{id} ({item_str} {})", path_str(item.owner_id.def_id))
         }
         Some(Node::ForeignItem(item)) => {
-            format!("foreign item {}{}", path_str(item.owner_id.def_id), id_str)
+            format!("{id} (foreign item {})", path_str(item.owner_id.def_id))
         }
         Some(Node::ImplItem(ii)) => {
             let kind = match ii.kind {
                 ImplItemKind::Const(..) => "assoc const",
                 ImplItemKind::Fn(..) => "method",
                 ImplItemKind::Type(_) => "assoc type",
             };
-            format!("{} {} in {}{}", kind, ii.ident, path_str(ii.owner_id.def_id), id_str)
+            format!("{id} ({kind} `{}` in {})", ii.ident, path_str(ii.owner_id.def_id))
         }
         Some(Node::TraitItem(ti)) => {
             let kind = match ti.kind {
@@ -1245,13 +1243,13 @@ fn hir_id_to_string(map: Map<'_>, id: HirId) -> String {
                 TraitItemKind::Type(..) => "assoc type",
             };
 
-            format!("{} {} in {}{}", kind, ti.ident, path_str(ti.owner_id.def_id), id_str)
+            format!("{id} ({kind} `{}` in {})", ti.ident, path_str(ti.owner_id.def_id))
         }
         Some(Node::Variant(ref variant)) => {
-            format!("variant {} in {}{}", variant.ident, path_str(variant.def_id), id_str)
+            format!("{id} (variant `{}` in {})", variant.ident, path_str(variant.def_id))
         }
         Some(Node::Field(ref field)) => {
-            format!("field {} in {}{}", field.ident, path_str(field.def_id), id_str)
+            format!("{id} (field `{}` in {})", field.ident, path_str(field.def_id))
         }
         Some(Node::AnonConst(_)) => node_str("const"),
         Some(Node::Expr(_)) => node_str("expr"),
@@ -1269,16 +1267,15 @@ fn hir_id_to_string(map: Map<'_>, id: HirId) -> String {
         Some(Node::Infer(_)) => node_str("infer"),
         Some(Node::Local(_)) => node_str("local"),
         Some(Node::Ctor(ctor)) => format!(
-            "ctor {}{}",
+            "{id} (ctor {})",
             ctor.ctor_def_id().map_or("<missing path>".into(), |def_id| path_str(def_id)),
-            id_str
         ),
         Some(Node::Lifetime(_)) => node_str("lifetime"),
         Some(Node::GenericParam(ref param)) => {
-            format!("generic_param {}{}", path_str(param.def_id), id_str)
+            format!("{id} (generic_param {})", path_str(param.def_id))
         }
-        Some(Node::Crate(..)) => String::from("root_crate"),
-        None => format!("unknown node{}", id_str),
+        Some(Node::Crate(..)) => String::from("(root_crate)"),
+        None => format!("{id} (unknown node)"),
     }
 }
 

compiler/rustc_middle/src/ty/context.rs

@@ -2171,7 +2171,7 @@ impl<'tcx> TyCtxt<'tcx> {
             self.late_bound_vars_map(id.owner)
                 .and_then(|map| map.get(&id.local_id).cloned())
                 .unwrap_or_else(|| {
-                    bug!("No bound vars found for {:?} ({:?})", self.hir().node_to_string(id), id)
+                    bug!("No bound vars found for {}", self.hir().node_to_string(id))
                 })
                 .iter(),
         )

compiler/rustc_middle/src/ty/sty.rs

@@ -2043,6 +2043,28 @@ impl<'tcx> Ty<'tcx> {
         cf.is_break()
     }
 
+    /// Checks whether a type recursively contains any closure
+    ///
+    /// Example: `Option<[closure@file.rs:4:20]>` returns true
+    pub fn contains_closure(self) -> bool {
+        struct ContainsClosureVisitor;
+
+        impl<'tcx> TypeVisitor<'tcx> for ContainsClosureVisitor {
+            type BreakTy = ();
+
+            fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
+                if let ty::Closure(_, _) = t.kind() {
+                    ControlFlow::BREAK
+                } else {
+                    t.super_visit_with(self)
+                }
+            }
+        }
+
+        let cf = self.visit_with(&mut ContainsClosureVisitor);
+        cf.is_break()
+    }
+
     /// Returns the type and mutability of `*ty`.
     ///
     /// The parameter `explicit` indicates if this is an *explicit* dereference.

compiler/rustc_middle/src/ty/typeck_results.rs

@@ -372,7 +372,7 @@ impl<'tcx> TypeckResults<'tcx> {
 
     pub fn node_type(&self, id: hir::HirId) -> Ty<'tcx> {
         self.node_type_opt(id).unwrap_or_else(|| {
-            bug!("node_type: no type for node `{}`", tls::with(|tcx| tcx.hir().node_to_string(id)))
+            bug!("node_type: no type for node {}", tls::with(|tcx| tcx.hir().node_to_string(id)))
         })
     }
 
@@ -551,9 +551,8 @@ fn validate_hir_id_for_typeck_results(hir_owner: OwnerId, hir_id: hir::HirId) {
 fn invalid_hir_id_for_typeck_results(hir_owner: OwnerId, hir_id: hir::HirId) {
     ty::tls::with(|tcx| {
         bug!(
-            "node {} with HirId::owner {:?} cannot be placed in TypeckResults with hir_owner {:?}",
+            "node {} cannot be placed in TypeckResults with hir_owner {:?}",
             tcx.hir().node_to_string(hir_id),
-            hir_id.owner,
             hir_owner
         )
     });

compiler/rustc_mir_transform/src/copy_prop.rs

@@ -162,17 +162,20 @@ impl<'tcx> MutVisitor<'tcx> for Replacer<'_, 'tcx> {
     }
 
     fn visit_statement(&mut self, stmt: &mut Statement<'tcx>, loc: Location) {
-        if let StatementKind::StorageDead(l) = stmt.kind
-            && self.storage_to_remove.contains(l)
-        {
-            stmt.make_nop();
-        } else if let StatementKind::Assign(box (ref place, ref mut rvalue)) = stmt.kind
-            && place.as_local().is_some()
-        {
-            // Do not replace assignments.
-            self.visit_rvalue(rvalue, loc)
-        } else {
-            self.super_statement(stmt, loc);
+        match stmt.kind {
+            // When removing storage statements, we need to remove both (#107511).
+            StatementKind::StorageLive(l) | StatementKind::StorageDead(l)
+                if self.storage_to_remove.contains(l) =>
+            {
+                stmt.make_nop()
+            }
+            StatementKind::Assign(box (ref place, ref mut rvalue))
+                if place.as_local().is_some() =>
+            {
+                // Do not replace assignments.
+                self.visit_rvalue(rvalue, loc)
+            }
+            _ => self.super_statement(stmt, loc),
         }
     }
 }

compiler/rustc_parse/src/errors.rs

@@ -1,3 +1,5 @@
+use std::borrow::Cow;
+
 use rustc_ast::token::Token;
 use rustc_ast::{Path, Visibility};
 use rustc_errors::{fluent, AddToDiagnostic, Applicability, EmissionGuarantee, IntoDiagnostic};
@@ -668,13 +670,10 @@ pub(crate) struct InclusiveRangeExtraEquals {
 #[diag(parse_inclusive_range_match_arrow)]
 pub(crate) struct InclusiveRangeMatchArrow {
     #[primary_span]
+    pub arrow: Span,
+    #[label]
     pub span: Span,
-    #[suggestion(
-        suggestion_add_space,
-        style = "verbose",
-        code = " ",
-        applicability = "machine-applicable"
-    )]
+    #[suggestion(style = "verbose", code = " ", applicability = "machine-applicable")]
     pub after_pat: Span,
 }
 
@@ -1802,8 +1801,9 @@ pub(crate) struct EnumPatternInsteadOfIdentifier {
 #[diag(parse_dot_dot_dot_for_remaining_fields)]
 pub(crate) struct DotDotDotForRemainingFields {
     #[primary_span]
-    #[suggestion(code = "..", applicability = "machine-applicable")]
+    #[suggestion(code = "..", style = "verbose", applicability = "machine-applicable")]
     pub span: Span,
+    pub token_str: Cow<'static, str>,
 }
 
 #[derive(Diagnostic)]

compiler/rustc_parse/src/parser/expr.rs

@@ -2717,6 +2717,14 @@ impl<'a> Parser<'a> {
                     );
                     err.emit();
                     this.bump();
+                } else if matches!(
+                    (&this.prev_token.kind, &this.token.kind),
+                    (token::DotDotEq, token::Gt)
+                ) {
+                    // `error_inclusive_range_match_arrow` handles cases like `0..=> {}`,
+                    // so we supress the error here
+                    err.delay_as_bug();
+                    this.bump();
                 } else {
                     return Err(err);
                 }

compiler/rustc_parse/src/parser/item.rs

@@ -2247,7 +2247,7 @@ impl<'a> Parser<'a> {
         let ext = self.parse_extern(case);
 
         if let Async::Yes { span, .. } = asyncness {
-            if span.rust_2015() {
+            if span.is_rust_2015() {
                 self.sess.emit_err(AsyncFnIn2015 { span, help: HelpUseLatestEdition::new() });
             }
         }

compiler/rustc_parse/src/parser/pat.rs

@@ -743,7 +743,7 @@ impl<'a> Parser<'a> {
             }
             token::Gt if no_space => {
                 let after_pat = span.with_hi(span.hi() - rustc_span::BytePos(1)).shrink_to_hi();
-                self.sess.emit_err(InclusiveRangeMatchArrow { span, after_pat });
+                self.sess.emit_err(InclusiveRangeMatchArrow { span, arrow: tok.span, after_pat });
             }
             _ => {
                 self.sess.emit_err(InclusiveRangeNoEnd { span });
@@ -962,12 +962,15 @@ impl<'a> Parser<'a> {
             }
             ate_comma = false;
 
-            if self.check(&token::DotDot) || self.token == token::DotDotDot {
+            if self.check(&token::DotDot)
+                || self.check_noexpect(&token::DotDotDot)
+                || self.check_keyword(kw::Underscore)
+            {
                 etc = true;
                 let mut etc_sp = self.token.span;
 
-                self.recover_one_fewer_dotdot();
-                self.bump(); // `..` || `...`
+                self.recover_bad_dot_dot();
+                self.bump(); // `..` || `...` || `_`
 
                 if self.token == token::CloseDelim(Delimiter::Brace) {
                     etc_span = Some(etc_sp);
@@ -1060,14 +1063,15 @@ impl<'a> Parser<'a> {
         Ok((fields, etc))
     }
 
-    /// Recover on `...` as if it were `..` to avoid further errors.
+    /// Recover on `...` or `_` as if it were `..` to avoid further errors.
     /// See issue #46718.
-    fn recover_one_fewer_dotdot(&self) {
-        if self.token != token::DotDotDot {
+    fn recover_bad_dot_dot(&self) {
+        if self.token == token::DotDot {
             return;
         }
 
-        self.sess.emit_err(DotDotDotForRemainingFields { span: self.token.span });
+        let token_str = pprust::token_to_string(&self.token);
+        self.sess.emit_err(DotDotDotForRemainingFields { span: self.token.span, token_str });
     }
 
     fn parse_pat_field(&mut self, lo: Span, attrs: AttrVec) -> PResult<'a, PatField> {