Rollup of 6 pull requests

compiler/rustc_lint/src/unused.rs

@@ -651,9 +651,11 @@ trait UnusedDelimLint {
 
     fn is_expr_delims_necessary(
         inner: &ast::Expr,
+        ctx: UnusedDelimsCtx,
         followed_by_block: bool,
-        followed_by_else: bool,
     ) -> bool {
+        let followed_by_else = ctx == UnusedDelimsCtx::AssignedValueLetElse;
+
         if followed_by_else {
             match inner.kind {
                 ast::ExprKind::Binary(op, ..) if op.node.is_lazy() => return true,
@@ -662,6 +664,13 @@ trait UnusedDelimLint {
             }
         }
 
+        // Check it's range in LetScrutineeExpr
+        if let ast::ExprKind::Range(..) = inner.kind
+            && matches!(ctx, UnusedDelimsCtx::LetScrutineeExpr)
+        {
+            return true;
+        }
+
         // Check if LHS needs parens to prevent false-positives in cases like `fn x() -> u8 { ({ 0 } + 1) }`.
         {
             let mut innermost = inner;
@@ -1007,8 +1016,7 @@ impl UnusedDelimLint for UnusedParens {
     ) {
         match value.kind {
             ast::ExprKind::Paren(ref inner) => {
-                let followed_by_else = ctx == UnusedDelimsCtx::AssignedValueLetElse;
-                if !Self::is_expr_delims_necessary(inner, followed_by_block, followed_by_else)
+                if !Self::is_expr_delims_necessary(inner, ctx, followed_by_block)
                     && value.attrs.is_empty()
                     && !value.span.from_expansion()
                     && (ctx != UnusedDelimsCtx::LetScrutineeExpr
@@ -1334,7 +1342,7 @@ impl UnusedDelimLint for UnusedBraces {
                 // FIXME(const_generics): handle paths when #67075 is fixed.
                 if let [stmt] = inner.stmts.as_slice() {
                     if let ast::StmtKind::Expr(ref expr) = stmt.kind {
-                        if !Self::is_expr_delims_necessary(expr, followed_by_block, false)
+                        if !Self::is_expr_delims_necessary(expr, ctx, followed_by_block)
                             && (ctx != UnusedDelimsCtx::AnonConst
                                 || (matches!(expr.kind, ast::ExprKind::Lit(_))
                                     && !expr.span.from_expansion()))

compiler/rustc_middle/src/ty/context.rs

@@ -1053,12 +1053,6 @@ impl<'tcx> TyCtxtAt<'tcx> {
         name: Symbol,
         def_kind: DefKind,
     ) -> TyCtxtFeed<'tcx, LocalDefId> {
-        // This function modifies `self.definitions` using a side-effect.
-        // We need to ensure that these side effects are re-run by the incr. comp. engine.
-        // Depending on the forever-red node will tell the graph that the calling query
-        // needs to be re-evaluated.
-        self.dep_graph.read_index(DepNodeIndex::FOREVER_RED_NODE);
-
         // The following call has the side effect of modifying the tables inside `definitions`.
         // These very tables are relied on by the incr. comp. engine to decode DepNodes and to
         // decode the on-disk cache.
@@ -1087,6 +1081,12 @@ impl<'tcx> TyCtxt<'tcx> {
         let data = def_kind.def_path_data(name);
         let def_id = self.untracked.definitions.write().create_def(parent, data);
 
+        // This function modifies `self.definitions` using a side-effect.
+        // We need to ensure that these side effects are re-run by the incr. comp. engine.
+        // Depending on the forever-red node will tell the graph that the calling query
+        // needs to be re-evaluated.
+        self.dep_graph.read_index(DepNodeIndex::FOREVER_RED_NODE);
+
         let feed = self.feed_local_def_id(def_id);
         feed.def_kind(def_kind);
         // Unique types created for closures participate in type privacy checking.

compiler/rustc_middle/src/ty/sty.rs

@@ -2373,6 +2373,20 @@ impl<'tcx> Ty<'tcx> {
     /// to represent the closure kind, because it has not yet been
     /// inferred. Once upvar inference (in `rustc_hir_analysis/src/check/upvar.rs`)
     /// is complete, that type variable will be unified.
+    ///
+    /// To be noted that you can use [`ClosureArgs::kind()`] or [`CoroutineClosureArgs::kind()`]
+    /// to get the same information, which you can get by calling [`GenericArgs::as_closure()`]
+    /// or [`GenericArgs::as_coroutine_closure()`], depending on the type of the closure.
+    ///
+    /// Otherwise, this method can be used as follows:
+    ///
+    /// ```rust,ignore (snippet of compiler code)
+    /// let TyKind::Closure(def_id, [closure_fn_kind_ty, ..]) = closure_ty.kind()
+    ///     && let Some(closure_kind) = closure_fn_kind_ty.expect_ty().to_opt_closure_kind()
+    /// {
+    ///     // your code
+    /// }
+    /// ```
     pub fn to_opt_closure_kind(self) -> Option<ty::ClosureKind> {
         match self.kind() {
             Int(int_ty) => match int_ty {

compiler/rustc_resolve/src/late/diagnostics.rs

@@ -460,7 +460,7 @@ impl<'a: 'ast, 'ast, 'tcx> LateResolutionVisitor<'a, '_, 'ast, 'tcx> {
             return (err, Vec::new());
         }
 
-        let (found, candidates) = self.try_lookup_name_relaxed(
+        let (found, mut candidates) = self.try_lookup_name_relaxed(
             &mut err,
             source,
             path,
@@ -473,10 +473,12 @@ impl<'a: 'ast, 'ast, 'tcx> LateResolutionVisitor<'a, '_, 'ast, 'tcx> {
             return (err, candidates);
         }
 
-        let mut fallback = self.suggest_trait_and_bounds(&mut err, source, res, span, &base_error);
+        if self.suggest_shadowed(&mut err, source, path, following_seg, span) {
+            // if there is already a shadowed name, don'suggest candidates for importing
+            candidates.clear();
+        }
 
-        // if we have suggested using pattern matching, then don't add needless suggestions
-        // for typos.
+        let mut fallback = self.suggest_trait_and_bounds(&mut err, source, res, span, &base_error);
         fallback |= self.suggest_typo(&mut err, source, path, following_seg, span, &base_error);
 
         if fallback {
@@ -872,25 +874,6 @@ impl<'a: 'ast, 'ast, 'tcx> LateResolutionVisitor<'a, '_, 'ast, 'tcx> {
         let ident_span = path.last().map_or(span, |ident| ident.ident.span);
         let typo_sugg =
             self.lookup_typo_candidate(path, following_seg, source.namespace(), is_expected);
-        let is_in_same_file = &|sp1, sp2| {
-            let source_map = self.r.tcx.sess.source_map();
-            let file1 = source_map.span_to_filename(sp1);
-            let file2 = source_map.span_to_filename(sp2);
-            file1 == file2
-        };
-        // print 'you might have meant' if the candidate is (1) is a shadowed name with
-        // accessible definition and (2) either defined in the same crate as the typo
-        // (could be in a different file) or introduced in the same file as the typo
-        // (could belong to a different crate)
-        if let TypoCandidate::Shadowed(res, Some(sugg_span)) = typo_sugg
-            && res.opt_def_id().is_some_and(|id| id.is_local() || is_in_same_file(span, sugg_span))
-        {
-            err.span_label(
-                sugg_span,
-                format!("you might have meant to refer to this {}", res.descr()),
-            );
-            return true;
-        }
         let mut fallback = false;
         let typo_sugg = typo_sugg.to_opt_suggestion();
         if !self.r.add_typo_suggestion(err, typo_sugg, ident_span) {
@@ -918,6 +901,39 @@ impl<'a: 'ast, 'ast, 'tcx> LateResolutionVisitor<'a, '_, 'ast, 'tcx> {
         fallback
     }
 
+    fn suggest_shadowed(
+        &mut self,
+        err: &mut Diagnostic,
+        source: PathSource<'_>,
+        path: &[Segment],
+        following_seg: Option<&Segment>,
+        span: Span,
+    ) -> bool {
+        let is_expected = &|res| source.is_expected(res);
+        let typo_sugg =
+            self.lookup_typo_candidate(path, following_seg, source.namespace(), is_expected);
+        let is_in_same_file = &|sp1, sp2| {
+            let source_map = self.r.tcx.sess.source_map();
+            let file1 = source_map.span_to_filename(sp1);
+            let file2 = source_map.span_to_filename(sp2);
+            file1 == file2
+        };
+        // print 'you might have meant' if the candidate is (1) is a shadowed name with
+        // accessible definition and (2) either defined in the same crate as the typo
+        // (could be in a different file) or introduced in the same file as the typo
+        // (could belong to a different crate)
+        if let TypoCandidate::Shadowed(res, Some(sugg_span)) = typo_sugg
+            && res.opt_def_id().is_some_and(|id| id.is_local() || is_in_same_file(span, sugg_span))
+        {
+            err.span_label(
+                sugg_span,
+                format!("you might have meant to refer to this {}", res.descr()),
+            );
+            return true;
+        }
+        false
+    }
+
     fn err_code_special_cases(
         &mut self,
         err: &mut Diagnostic,

src/tools/rustfmt/src/types.rs

@@ -537,18 +537,29 @@ impl Rewrite for ast::Lifetime {
 impl Rewrite for ast::GenericBound {
     fn rewrite(&self, context: &RewriteContext<'_>, shape: Shape) -> Option<String> {
         match *self {
-            ast::GenericBound::Trait(ref poly_trait_ref, modifiers) => {
+            ast::GenericBound::Trait(
+                ref poly_trait_ref,
+                ast::TraitBoundModifiers {
+                    constness,
+                    asyncness,
+                    polarity,
+                },
+            ) => {
                 let snippet = context.snippet(self.span());
                 let has_paren = snippet.starts_with('(') && snippet.ends_with(')');
-                let mut constness = modifiers.constness.as_str().to_string();
+                let mut constness = constness.as_str().to_string();
                 if !constness.is_empty() {
                     constness.push(' ');
                 }
-                let polarity = modifiers.polarity.as_str();
+                let mut asyncness = asyncness.as_str().to_string();
+                if !asyncness.is_empty() {
+                    asyncness.push(' ');
+                }
+                let polarity = polarity.as_str();
                 let shape = shape.offset_left(constness.len() + polarity.len())?;
                 poly_trait_ref
                     .rewrite(context, shape)
-                    .map(|s| format!("{constness}{polarity}{s}"))
+                    .map(|s| format!("{constness}{asyncness}{polarity}{s}"))
                     .map(|s| if has_paren { format!("({})", s) } else { s })
             }
             ast::GenericBound::Outlives(ref lifetime) => lifetime.rewrite(context, shape),

src/tools/rustfmt/tests/target/asyncness.rs

@@ -0,0 +1,3 @@
+// rustfmt-edition: 2018
+
+fn foo() -> impl async Fn() {}

src/tools/tidy/src/ui_tests.rs

@@ -14,7 +14,7 @@ use std::path::{Path, PathBuf};
 // #73494.
 const ENTRY_LIMIT: usize = 900;
 // FIXME: The following limits should be reduced eventually.
-const ISSUES_ENTRY_LIMIT: usize = 1794;
+const ISSUES_ENTRY_LIMIT: usize = 1781;
 const ROOT_ENTRY_LIMIT: usize = 870;
 
 const EXPECTED_TEST_FILE_EXTENSIONS: &[&str] = &[

tests/ui/lint/issue-121070-let-range.rs

@@ -0,0 +1,16 @@
+// check-pass
+
+#![feature(let_chains)]
+#![allow(irrefutable_let_patterns)]
+fn main() {
+    let _a = 0..1;
+
+    if let x = (0..1) {
+        eprintln!("x: {:?}", x);
+    }
+    if let x = (0..1) &&
+        let _y = (0..2)
+    {
+        eprintln!("x: {:?}", x);
+    }
+}

tests/ui/resolve/issue-120559.rs

@@ -0,0 +1,5 @@
+use std::io::Read;
+
+fn f<T: Read, U, Read>() {} //~ ERROR expected trait, found type parameter `Read`
+
+fn main() {}

tests/ui/resolve/issue-120559.stderr

@@ -0,0 +1,14 @@
+error[E0404]: expected trait, found type parameter `Read`
+  --> $DIR/issue-120559.rs:3:9
+   |
+LL | use std::io::Read;
+   |              ---- you might have meant to refer to this trait
+LL |
+LL | fn f<T: Read, U, Read>() {}
+   |         ^^^^     ---- found this type parameter
+   |         |
+   |         not a trait
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0404`.

tests/ui/span/issue-35987.stderr

@@ -8,11 +8,6 @@ LL | impl<T: Clone, Add> Add for Foo<T> {
    |                ---  ^^^ not a trait
    |                |
    |                found this type parameter
-   |
-help: consider importing this trait instead
-   |
-LL + use std::ops::Add;
-   |
 
 error: aborting due to 1 previous error