Rollup of 10 pull requests

compiler/rustc_ast_passes/src/ast_validation.rs

@@ -1593,44 +1593,98 @@ fn deny_equality_constraints(
             }
         }
     }
-    // Given `A: Foo, A::Bar = RhsTy`, suggest `A: Foo<Bar = RhsTy>`.
-    if let TyKind::Path(None, full_path) = &predicate.lhs_ty.kind {
-        if let [potential_param, potential_assoc] = &full_path.segments[..] {
-            for param in &generics.params {
-                if param.ident == potential_param.ident {
-                    for bound in &param.bounds {
-                        if let ast::GenericBound::Trait(trait_ref, TraitBoundModifiers::NONE) =
-                            bound
+
+    let mut suggest =
+        |poly: &PolyTraitRef, potential_assoc: &PathSegment, predicate: &WhereEqPredicate| {
+            if let [trait_segment] = &poly.trait_ref.path.segments[..] {
+                let assoc = pprust::path_to_string(&ast::Path::from_ident(potential_assoc.ident));
+                let ty = pprust::ty_to_string(&predicate.rhs_ty);
+                let (args, span) = match &trait_segment.args {
+                    Some(args) => match args.deref() {
+                        ast::GenericArgs::AngleBracketed(args) => {
+                            let Some(arg) = args.args.last() else {
+                                return;
+                            };
+                            (format!(", {assoc} = {ty}"), arg.span().shrink_to_hi())
+                        }
+                        _ => return,
+                    },
+                    None => (format!("<{assoc} = {ty}>"), trait_segment.span().shrink_to_hi()),
+                };
+                let removal_span = if generics.where_clause.predicates.len() == 1 {
+                    // We're removing th eonly where bound left, remove the whole thing.
+                    generics.where_clause.span
+                } else {
+                    let mut span = predicate.span;
+                    let mut prev: Option<Span> = None;
+                    let mut preds = generics.where_clause.predicates.iter().peekable();
+                    // Find the predicate that shouldn't have been in the where bound list.
+                    while let Some(pred) = preds.next() {
+                        if let WherePredicate::EqPredicate(pred) = pred
+                            && pred.span == predicate.span
                         {
-                            if let [trait_segment] = &trait_ref.trait_ref.path.segments[..] {
-                                let assoc = pprust::path_to_string(&ast::Path::from_ident(
-                                    potential_assoc.ident,
-                                ));
-                                let ty = pprust::ty_to_string(&predicate.rhs_ty);
-                                let (args, span) = match &trait_segment.args {
-                                    Some(args) => match args.deref() {
-                                        ast::GenericArgs::AngleBracketed(args) => {
-                                            let Some(arg) = args.args.last() else {
-                                                continue;
-                                            };
-                                            (format!(", {assoc} = {ty}"), arg.span().shrink_to_hi())
-                                        }
-                                        _ => continue,
-                                    },
-                                    None => (
-                                        format!("<{assoc} = {ty}>"),
-                                        trait_segment.span().shrink_to_hi(),
-                                    ),
-                                };
-                                err.assoc2 = Some(errors::AssociatedSuggestion2 {
-                                    span,
-                                    args,
-                                    predicate: predicate.span,
-                                    trait_segment: trait_segment.ident,
-                                    potential_assoc: potential_assoc.ident,
-                                });
+                            if let Some(next) = preds.peek() {
+                                // This is the first predicate, remove the trailing comma as well.
+                                span = span.with_hi(next.span().lo());
+                            } else if let Some(prev) = prev {
+                                // Remove the previous comma as well.
+                                span = span.with_lo(prev.hi());
                             }
                         }
+                        prev = Some(pred.span());
+                    }
+                    span
+                };
+                err.assoc2 = Some(errors::AssociatedSuggestion2 {
+                    span,
+                    args,
+                    predicate: removal_span,
+                    trait_segment: trait_segment.ident,
+                    potential_assoc: potential_assoc.ident,
+                });
+            }
+        };
+
+    if let TyKind::Path(None, full_path) = &predicate.lhs_ty.kind {
+        // Given `A: Foo, Foo::Bar = RhsTy`, suggest `A: Foo<Bar = RhsTy>`.
+        for bounds in generics.params.iter().map(|p| &p.bounds).chain(
+            generics.where_clause.predicates.iter().filter_map(|pred| match pred {
+                WherePredicate::BoundPredicate(p) => Some(&p.bounds),
+                _ => None,
+            }),
+        ) {
+            for bound in bounds {
+                if let GenericBound::Trait(poly, TraitBoundModifiers::NONE) = bound {
+                    if full_path.segments[..full_path.segments.len() - 1]
+                        .iter()
+                        .map(|segment| segment.ident.name)
+                        .zip(poly.trait_ref.path.segments.iter().map(|segment| segment.ident.name))
+                        .all(|(a, b)| a == b)
+                        && let Some(potential_assoc) = full_path.segments.iter().last()
+                    {
+                        suggest(poly, potential_assoc, predicate);
+                    }
+                }
+            }
+        }
+        // Given `A: Foo, A::Bar = RhsTy`, suggest `A: Foo<Bar = RhsTy>`.
+        if let [potential_param, potential_assoc] = &full_path.segments[..] {
+            for (ident, bounds) in generics.params.iter().map(|p| (p.ident, &p.bounds)).chain(
+                generics.where_clause.predicates.iter().filter_map(|pred| match pred {
+                    WherePredicate::BoundPredicate(p)
+                        if let ast::TyKind::Path(None, path) = &p.bounded_ty.kind
+                            && let [segment] = &path.segments[..] =>
+                    {
+                        Some((segment.ident, &p.bounds))
+                    }
+                    _ => None,
+                }),
+            ) {
+                if ident == potential_param.ident {
+                    for bound in bounds {
+                        if let ast::GenericBound::Trait(poly, TraitBoundModifiers::NONE) = bound {
+                            suggest(poly, potential_assoc, predicate);
+                        }
                     }
                 }
             }

compiler/rustc_hir_typeck/src/coercion.rs

@@ -98,8 +98,11 @@ struct CollectRetsVisitor<'tcx> {
 
 impl<'tcx> Visitor<'tcx> for CollectRetsVisitor<'tcx> {
     fn visit_expr(&mut self, expr: &'tcx Expr<'tcx>) {
-        if let hir::ExprKind::Ret(_) = expr.kind {
-            self.ret_exprs.push(expr);
+        match expr.kind {
+            hir::ExprKind::Ret(_) => self.ret_exprs.push(expr),
+            // `return` in closures does not return from the outer function
+            hir::ExprKind::Closure(_) => return,
+            _ => {}
         }
         intravisit::walk_expr(self, expr);
     }
@@ -1845,13 +1848,31 @@ impl<'tcx, 'exprs, E: AsCoercionSite> CoerceMany<'tcx, 'exprs, E> {
         }
 
         let parent_id = fcx.tcx.hir().get_parent_item(id);
-        let parent_item = fcx.tcx.hir_node_by_def_id(parent_id.def_id);
+        let mut parent_item = fcx.tcx.hir_node_by_def_id(parent_id.def_id);
+        // When suggesting return, we need to account for closures and async blocks, not just items.
+        for (_, node) in fcx.tcx.hir().parent_iter(id) {
+            match node {
+                hir::Node::Expr(&hir::Expr {
+                    kind: hir::ExprKind::Closure(hir::Closure { .. }),
+                    ..
+                }) => {
+                    parent_item = node;
+                    break;
+                }
+                hir::Node::Item(_) | hir::Node::TraitItem(_) | hir::Node::ImplItem(_) => break,
+                _ => {}
+            }
+        }
 
-        if let (Some(expr), Some(_), Some((fn_id, fn_decl, _, _))) =
-            (expression, blk_id, fcx.get_node_fn_decl(parent_item))
-        {
+        if let (Some(expr), Some(_), Some(fn_decl)) = (expression, blk_id, parent_item.fn_decl()) {
             fcx.suggest_missing_break_or_return_expr(
-                &mut err, expr, fn_decl, expected, found, id, fn_id,
+                &mut err,
+                expr,
+                fn_decl,
+                expected,
+                found,
+                id,
+                parent_id.into(),
             );
         }
 

compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs

@@ -963,14 +963,35 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 owner_id,
                 ..
             }) => Some((hir::HirId::make_owner(owner_id.def_id), &sig.decl, ident, false)),
-            Node::Expr(&hir::Expr { hir_id, kind: hir::ExprKind::Closure(..), .. })
-                if let Node::Item(&hir::Item {
-                    ident,
-                    kind: hir::ItemKind::Fn(ref sig, ..),
-                    owner_id,
-                    ..
-                }) = self.tcx.parent_hir_node(hir_id) =>
-            {
+            Node::Expr(&hir::Expr {
+                hir_id,
+                kind:
+                    hir::ExprKind::Closure(hir::Closure {
+                        kind: hir::ClosureKind::Coroutine(..), ..
+                    }),
+                ..
+            }) => {
+                let (ident, sig, owner_id) = match self.tcx.parent_hir_node(hir_id) {
+                    Node::Item(&hir::Item {
+                        ident,
+                        kind: hir::ItemKind::Fn(ref sig, ..),
+                        owner_id,
+                        ..
+                    }) => (ident, sig, owner_id),
+                    Node::TraitItem(&hir::TraitItem {
+                        ident,
+                        kind: hir::TraitItemKind::Fn(ref sig, ..),
+                        owner_id,
+                        ..
+                    }) => (ident, sig, owner_id),
+                    Node::ImplItem(&hir::ImplItem {
+                        ident,
+                        kind: hir::ImplItemKind::Fn(ref sig, ..),
+                        owner_id,
+                        ..
+                    }) => (ident, sig, owner_id),
+                    _ => return None,
+                };
                 Some((
                     hir::HirId::make_owner(owner_id.def_id),
                     &sig.decl,

compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs

@@ -1726,7 +1726,10 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     }
 
     /// Given a function block's `HirId`, returns its `FnDecl` if it exists, or `None` otherwise.
-    fn get_parent_fn_decl(&self, blk_id: hir::HirId) -> Option<(&'tcx hir::FnDecl<'tcx>, Ident)> {
+    pub(crate) fn get_parent_fn_decl(
+        &self,
+        blk_id: hir::HirId,
+    ) -> Option<(&'tcx hir::FnDecl<'tcx>, Ident)> {
         let parent = self.tcx.hir_node_by_def_id(self.tcx.hir().get_parent_item(blk_id).def_id);
         self.get_node_fn_decl(parent).map(|(_, fn_decl, ident, _)| (fn_decl, ident))
     }

compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs

@@ -827,6 +827,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             }
             hir::FnRetTy::Return(hir_ty) => {
                 if let hir::TyKind::OpaqueDef(item_id, ..) = hir_ty.kind
+                    // FIXME: account for RPITIT.
                     && let hir::Node::Item(hir::Item {
                         kind: hir::ItemKind::OpaqueTy(op_ty), ..
                     }) = self.tcx.hir_node(item_id.hir_id())
@@ -1038,33 +1039,62 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             return;
         }
 
-        if let hir::FnRetTy::Return(ty) = fn_decl.output {
-            let ty = self.astconv().ast_ty_to_ty(ty);
-            let bound_vars = self.tcx.late_bound_vars(fn_id);
-            let ty = self
-                .tcx
-                .instantiate_bound_regions_with_erased(Binder::bind_with_vars(ty, bound_vars));
-            let ty = match self.tcx.asyncness(fn_id.owner) {
-                ty::Asyncness::Yes => self.get_impl_future_output_ty(ty).unwrap_or_else(|| {
-                    span_bug!(fn_decl.output.span(), "failed to get output type of async function")
-                }),
-                ty::Asyncness::No => ty,
-            };
-            let ty = self.normalize(expr.span, ty);
-            if self.can_coerce(found, ty) {
-                if let Some(owner_node) = self.tcx.hir_node(fn_id).as_owner()
-                    && let Some(span) = expr.span.find_ancestor_inside(*owner_node.span())
-                {
-                    err.multipart_suggestion(
-                        "you might have meant to return this value",
-                        vec![
-                            (span.shrink_to_lo(), "return ".to_string()),
-                            (span.shrink_to_hi(), ";".to_string()),
-                        ],
-                        Applicability::MaybeIncorrect,
-                    );
-                }
+        let scope = self
+            .tcx
+            .hir()
+            .parent_iter(id)
+            .filter(|(_, node)| {
+                matches!(
+                    node,
+                    Node::Expr(Expr { kind: ExprKind::Closure(..), .. })
+                        | Node::Item(_)
+                        | Node::TraitItem(_)
+                        | Node::ImplItem(_)
+                )
+            })
+            .next();
+        let in_closure =
+            matches!(scope, Some((_, Node::Expr(Expr { kind: ExprKind::Closure(..), .. }))));
+
+        let can_return = match fn_decl.output {
+            hir::FnRetTy::Return(ty) => {
+                let ty = self.astconv().ast_ty_to_ty(ty);
+                let bound_vars = self.tcx.late_bound_vars(fn_id);
+                let ty = self
+                    .tcx
+                    .instantiate_bound_regions_with_erased(Binder::bind_with_vars(ty, bound_vars));
+                let ty = match self.tcx.asyncness(fn_id.owner) {
+                    ty::Asyncness::Yes => self.get_impl_future_output_ty(ty).unwrap_or_else(|| {
+                        span_bug!(
+                            fn_decl.output.span(),
+                            "failed to get output type of async function"
+                        )
+                    }),
+                    ty::Asyncness::No => ty,
+                };
+                let ty = self.normalize(expr.span, ty);
+                self.can_coerce(found, ty)
+            }
+            hir::FnRetTy::DefaultReturn(_) if in_closure => {
+                self.ret_coercion.as_ref().map_or(false, |ret| {
+                    let ret_ty = ret.borrow().expected_ty();
+                    self.can_coerce(found, ret_ty)
+                })
             }
+            _ => false,
+        };
+        if can_return
+            && let Some(owner_node) = self.tcx.hir_node(fn_id).as_owner()
+            && let Some(span) = expr.span.find_ancestor_inside(*owner_node.span())
+        {
+            err.multipart_suggestion(
+                "you might have meant to return this value",
+                vec![
+                    (span.shrink_to_lo(), "return ".to_string()),
+                    (span.shrink_to_hi(), ";".to_string()),
+                ],
+                Applicability::MaybeIncorrect,
+            );
         }
     }
 

compiler/rustc_hir_typeck/src/method/suggest.rs

@@ -1073,12 +1073,6 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                                         // for instance
                                         self.tcx.at(span).type_of(*def_id).instantiate_identity()
                                             != rcvr_ty
-                                            && self
-                                                .tcx
-                                                .at(span)
-                                                .type_of(*def_id)
-                                                .instantiate_identity()
-                                                != rcvr_ty
                                     }
                                     (Mode::Path, false, _) => true,
                                     _ => false,
@@ -1092,7 +1086,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                         inherent_impls_candidate.sort();
                         inherent_impls_candidate.dedup();
 
-                        // number of type to shows at most.
+                        // number of types to show at most
                         let limit = if inherent_impls_candidate.len() == 5 { 5 } else { 4 };
                         let type_candidates = inherent_impls_candidate
                             .iter()

compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp

@@ -43,6 +43,9 @@
 #include "llvm/Transforms/Instrumentation.h"
 #include "llvm/Transforms/Instrumentation/AddressSanitizer.h"
 #include "llvm/Support/TimeProfiler.h"
+#if LLVM_VERSION_GE(19, 0)
+#include "llvm/Support/PGOOptions.h"
+#endif
 #include "llvm/Transforms/Instrumentation/GCOVProfiler.h"
 #include "llvm/Transforms/Instrumentation/InstrProfiling.h"
 #include "llvm/Transforms/Instrumentation/ThreadSanitizer.h"
@@ -749,6 +752,9 @@ LLVMRustOptimize(
                         FS,
 #endif
                         PGOOptions::IRInstr, PGOOptions::NoCSAction,
+#if LLVM_VERSION_GE(19, 0)
+                        PGOOptions::ColdFuncOpt::Default,
+#endif
                         DebugInfoForProfiling);
   } else if (PGOUsePath) {
     assert(!PGOSampleUsePath);
@@ -758,6 +764,9 @@ LLVMRustOptimize(
                         FS,
 #endif
                         PGOOptions::IRUse, PGOOptions::NoCSAction,
+#if LLVM_VERSION_GE(19, 0)
+                        PGOOptions::ColdFuncOpt::Default,
+#endif
                         DebugInfoForProfiling);
   } else if (PGOSampleUsePath) {
     PGOOpt = PGOOptions(PGOSampleUsePath, "", "",
@@ -766,6 +775,9 @@ LLVMRustOptimize(
                         FS,
 #endif
                         PGOOptions::SampleUse, PGOOptions::NoCSAction,
+#if LLVM_VERSION_GE(19, 0)
+                        PGOOptions::ColdFuncOpt::Default,
+#endif
                         DebugInfoForProfiling);
   } else if (DebugInfoForProfiling) {
     PGOOpt = PGOOptions("", "", "",
@@ -774,6 +786,9 @@ LLVMRustOptimize(
                         FS,
 #endif
                         PGOOptions::NoAction, PGOOptions::NoCSAction,
+#if LLVM_VERSION_GE(19, 0)
+                        PGOOptions::ColdFuncOpt::Default,
+#endif
                         DebugInfoForProfiling);
   }
 

compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp

@@ -1801,6 +1801,9 @@ extern "C" LLVMRustResult LLVMRustWriteImportLibrary(
       std::string{},    // ExtName
       std::string{},    // SymbolName
       std::string{},    // AliasTarget
+#if LLVM_VERSION_GE(19, 0)
+      std::string{},    // ExportAs
+#endif
       ordinal,          // Ordinal
       ordinal_present,  // Noname
       false,            // Data

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

@@ -617,7 +617,7 @@ impl<'hir> Map<'hir> {
                 Node::Item(_)
                 | Node::ForeignItem(_)
                 | Node::TraitItem(_)
-                | Node::Expr(Expr { kind: ExprKind::Closure { .. }, .. })
+                | Node::Expr(Expr { kind: ExprKind::Closure(_), .. })
                 | Node::ImplItem(_)
                     // The input node `id` must be enclosed in the method's body as opposed
                     // to some other place such as its return type (fixes #114918).

compiler/rustc_mir_dataflow/src/move_paths/builder.rs

@@ -1,7 +1,7 @@
 use rustc_index::IndexVec;
 use rustc_middle::mir::tcx::{PlaceTy, RvalueInitializationState};
 use rustc_middle::mir::*;
-use rustc_middle::ty::{self, Ty, TyCtxt};
+use rustc_middle::ty::{self, Ty, TyCtxt, TypeVisitableExt};
 use smallvec::{smallvec, SmallVec};
 
 use std::mem;
@@ -132,6 +132,9 @@ impl<'b, 'a, 'tcx, F: Fn(Ty<'tcx>) -> bool> Gatherer<'b, 'a, 'tcx, F> {
             let body = self.builder.body;
             let tcx = self.builder.tcx;
             let place_ty = place_ref.ty(body, tcx).ty;
+            if place_ty.references_error() {
+                return MovePathResult::Error;
+            }
             match elem {
                 ProjectionElem::Deref => match place_ty.kind() {
                     ty::Ref(..) | ty::RawPtr(..) => {

compiler/rustc_parse/src/parser/diagnostics.rs

@@ -900,7 +900,7 @@ impl<'a> Parser<'a> {
             // fn foo() -> Foo {
             //     field: value,
             // }
-            info!(?maybe_struct_name, ?self.token);
+            debug!(?maybe_struct_name, ?self.token);
             let mut snapshot = self.create_snapshot_for_diagnostic();
             let path = Path {
                 segments: ThinVec::new(),

library/alloc/src/fmt.rs

@@ -278,6 +278,22 @@
 //! Hello, `     123` has 3 right-aligned characters
 //! ```
 //!
+//! When truncating these values, Rust uses [round half-to-even](https://en.wikipedia.org/wiki/Rounding#Rounding_half_to_even),
+//! which is the default rounding mode in IEEE 754.
+//! For example,
+//!
+//! ```
+//! print!("{0:.1$e}", 12345, 3);
+//! print!("{0:.1$e}", 12355, 3);
+//! ```
+//!
+//! Would return:
+//!
+//! ```text
+//! 1.234e4
+//! 1.236e4
+//! ```
+//!
 //! ## Localization
 //!
 //! In some programming languages, the behavior of string formatting functions

library/core/src/iter/traits/iterator.rs

@@ -89,8 +89,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [1, 2, 3];
     ///
@@ -249,8 +247,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [1, 2, 3];
     /// assert_eq!(a.iter().count(), 3);
@@ -280,8 +276,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [1, 2, 3];
     /// assert_eq!(a.iter().last(), Some(&3));
@@ -324,8 +318,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// #![feature(iter_advance_by)]
     ///
@@ -432,8 +424,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [0, 1, 2, 3, 4, 5];
     /// let mut iter = a.iter().step_by(2);
@@ -1342,8 +1332,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [1, 2, 3];
     ///
@@ -1434,8 +1422,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [1, 2, 3, 4];
     ///
@@ -1486,8 +1472,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let words = ["alpha", "beta", "gamma"];
     ///
@@ -1765,8 +1749,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// // an iterator which alternates between Some and None
     /// struct Alternate {
@@ -1911,8 +1893,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let mut words = ["hello", "world", "of", "Rust"].into_iter();
     ///
@@ -2221,8 +2201,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [1, 2, 3];
     ///
@@ -3193,8 +3171,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [1, 2, 3];
     /// let b: Vec<u32> = Vec::new();
@@ -3232,8 +3208,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [1, 2, 3];
     /// let b: Vec<u32> = Vec::new();
@@ -3420,8 +3394,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [(1, 2), (3, 4), (5, 6)];
     ///
@@ -3458,8 +3430,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [1, 2, 3];
     ///
@@ -3538,8 +3508,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [1, 2, 3];
     ///
@@ -3624,8 +3592,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// let a = [1, 2, 3];
     /// let sum: i32 = a.iter().sum();
@@ -3703,8 +3669,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// #![feature(iter_order_by)]
     ///
@@ -3790,8 +3754,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// #![feature(iter_order_by)]
     ///
@@ -3863,8 +3825,6 @@ pub trait Iterator {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// #![feature(iter_order_by)]
     ///

tests/ui/async-await/missing-return-in-async-block.fixed

@@ -0,0 +1,22 @@
+// run-rustfix
+// edition:2021
+use std::future::Future;
+use std::pin::Pin;
+pub struct S;
+pub fn foo() {
+    let _ = Box::pin(async move {
+        if true {
+            return Ok(S); //~ ERROR mismatched types
+        }
+        Err(())
+    });
+}
+pub fn bar() -> Pin<Box<dyn Future<Output = Result<S, ()>> + 'static>> {
+    Box::pin(async move {
+        if true {
+            return Ok(S); //~ ERROR mismatched types
+        }
+        Err(())
+    })
+}
+fn main() {}

tests/ui/async-await/missing-return-in-async-block.rs

@@ -0,0 +1,22 @@
+// run-rustfix
+// edition:2021
+use std::future::Future;
+use std::pin::Pin;
+pub struct S;
+pub fn foo() {
+    let _ = Box::pin(async move {
+        if true {
+            Ok(S) //~ ERROR mismatched types
+        }
+        Err(())
+    });
+}
+pub fn bar() -> Pin<Box<dyn Future<Output = Result<S, ()>> + 'static>> {
+    Box::pin(async move {
+        if true {
+            Ok(S) //~ ERROR mismatched types
+        }
+        Err(())
+    })
+}
+fn main() {}

tests/ui/async-await/missing-return-in-async-block.stderr

@@ -0,0 +1,35 @@
+error[E0308]: mismatched types
+  --> $DIR/missing-return-in-async-block.rs:9:13
+   |
+LL | /         if true {
+LL | |             Ok(S)
+   | |             ^^^^^ expected `()`, found `Result<S, _>`
+LL | |         }
+   | |_________- expected this to be `()`
+   |
+   = note: expected unit type `()`
+                   found enum `Result<S, _>`
+help: you might have meant to return this value
+   |
+LL |             return Ok(S);
+   |             ++++++      +
+
+error[E0308]: mismatched types
+  --> $DIR/missing-return-in-async-block.rs:17:13
+   |
+LL | /         if true {
+LL | |             Ok(S)
+   | |             ^^^^^ expected `()`, found `Result<S, _>`
+LL | |         }
+   | |_________- expected this to be `()`
+   |
+   = note: expected unit type `()`
+                   found enum `Result<S, _>`
+help: you might have meant to return this value
+   |
+LL |             return Ok(S);
+   |             ++++++      +
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0308`.

tests/ui/consts/const_refs_to_static_fail_invalid.rs

@@ -1,6 +1,7 @@
 // normalize-stderr-test "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
 // normalize-stderr-test "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
 #![feature(const_refs_to_static)]
+#![allow(static_mut_ref)]
 
 fn invalid() {
     static S: i8 = 10;
@@ -38,7 +39,6 @@ fn mutable() {
     const C: &i32 = unsafe { &S_MUT };
     //~^ERROR: undefined behavior
     //~| encountered reference to mutable memory
-    //~| WARN shared reference of mutable static is discouraged
 
     // This *must not build*, the constant we are matching against
     // could change its value!

tests/ui/consts/const_refs_to_static_fail_invalid.stderr

@@ -1,20 +1,5 @@
-warning: shared reference of mutable static is discouraged
-  --> $DIR/const_refs_to_static_fail_invalid.rs:38:30
-   |
-LL |     const C: &i32 = unsafe { &S_MUT };
-   |                              ^^^^^^ shared reference of mutable static
-   |
-   = note: for more information, see issue #114447 <https://github.com/rust-lang/rust/issues/114447>
-   = note: reference of mutable static is a hard error from 2024 edition
-   = note: mutable statics can be written to by multiple threads: aliasing violations or data races will cause undefined behavior
-   = note: `#[warn(static_mut_ref)]` on by default
-help: shared references are dangerous since if there's any kind of mutation of that static while the reference lives, that's UB; use `addr_of!` instead to create a raw pointer
-   |
-LL |     const C: &i32 = unsafe { addr_of!(S_MUT) };
-   |                              ~~~~~~~~~~~~~~~
-
 error[E0080]: it is undefined behavior to use this value
-  --> $DIR/const_refs_to_static_fail_invalid.rs:8:5
+  --> $DIR/const_refs_to_static_fail_invalid.rs:9:5
    |
 LL |     const C: &bool = unsafe { std::mem::transmute(&S) };
    |     ^^^^^^^^^^^^^^ constructing invalid value at .<deref>: encountered 0x0a, but expected a boolean
@@ -25,13 +10,13 @@ LL |     const C: &bool = unsafe { std::mem::transmute(&S) };
            }
 
 error: could not evaluate constant pattern
-  --> $DIR/const_refs_to_static_fail_invalid.rs:14:9
+  --> $DIR/const_refs_to_static_fail_invalid.rs:15:9
    |
 LL |         C => {}
    |         ^
 
 error[E0080]: it is undefined behavior to use this value
-  --> $DIR/const_refs_to_static_fail_invalid.rs:24:5
+  --> $DIR/const_refs_to_static_fail_invalid.rs:25:5
    |
 LL |     const C: &i8 = unsafe { &S };
    |     ^^^^^^^^^^^^ constructing invalid value: encountered reference to `extern` static in `const`
@@ -42,13 +27,13 @@ LL |     const C: &i8 = unsafe { &S };
            }
 
 error: could not evaluate constant pattern
-  --> $DIR/const_refs_to_static_fail_invalid.rs:30:9
+  --> $DIR/const_refs_to_static_fail_invalid.rs:31:9
    |
 LL |         C => {}
    |         ^
 
 error[E0080]: it is undefined behavior to use this value
-  --> $DIR/const_refs_to_static_fail_invalid.rs:38:5
+  --> $DIR/const_refs_to_static_fail_invalid.rs:39:5
    |
 LL |     const C: &i32 = unsafe { &S_MUT };
    |     ^^^^^^^^^^^^^ constructing invalid value: encountered reference to mutable memory in `const`
@@ -64,6 +49,6 @@ error: could not evaluate constant pattern
 LL |         C => {},
    |         ^
 
-error: aborting due to 6 previous errors; 1 warning emitted
+error: aborting due to 6 previous errors
 
 For more information about this error, try `rustc --explain E0080`.

tests/ui/consts/issue-17718-const-bad-values.rs

@@ -1,9 +1,10 @@
+#![allow(static_mut_ref)]
+
 const C1: &'static mut [usize] = &mut [];
 //~^ ERROR: mutable references are not allowed
 
 static mut S: usize = 3;
 const C2: &'static mut usize = unsafe { &mut S };
 //~^ ERROR: referencing statics in constants
-//~| WARN mutable reference of mutable static is discouraged [static_mut_ref]
 
 fn main() {}

tests/ui/consts/issue-17718-const-bad-values.stderr

@@ -1,26 +1,11 @@
-warning: mutable reference of mutable static is discouraged
-  --> $DIR/issue-17718-const-bad-values.rs:5:41
-   |
-LL | const C2: &'static mut usize = unsafe { &mut S };
-   |                                         ^^^^^^ mutable reference of mutable static
-   |
-   = note: for more information, see issue #114447 <https://github.com/rust-lang/rust/issues/114447>
-   = note: reference of mutable static is a hard error from 2024 edition
-   = note: mutable statics can be written to by multiple threads: aliasing violations or data races will cause undefined behavior
-   = note: `#[warn(static_mut_ref)]` on by default
-help: mutable references are dangerous since if there's any other pointer or reference used for that static while the reference lives, that's UB; use `addr_of_mut!` instead to create a raw pointer
-   |
-LL | const C2: &'static mut usize = unsafe { addr_of_mut!(S) };
-   |                                         ~~~~~~~~~~~~~~~
-
 error[E0764]: mutable references are not allowed in the final value of constants
-  --> $DIR/issue-17718-const-bad-values.rs:1:34
+  --> $DIR/issue-17718-const-bad-values.rs:3:34
    |
 LL | const C1: &'static mut [usize] = &mut [];
    |                                  ^^^^^^^
 
 error[E0658]: referencing statics in constants is unstable
-  --> $DIR/issue-17718-const-bad-values.rs:5:46
+  --> $DIR/issue-17718-const-bad-values.rs:7:46
    |
 LL | const C2: &'static mut usize = unsafe { &mut S };
    |                                              ^
@@ -31,7 +16,7 @@ LL | const C2: &'static mut usize = unsafe { &mut S };
    = note: `static` and `const` variables can refer to other `const` variables. A `const` variable, however, cannot refer to a `static` variable.
    = help: to fix this, the value can be extracted to a `const` and then used.
 
-error: aborting due to 2 previous errors; 1 warning emitted
+error: aborting due to 2 previous errors
 
 Some errors have detailed explanations: E0658, E0764.
 For more information about an error, try `rustc --explain E0658`.

tests/ui/consts/miri_unleashed/const_refers_to_static_cross_crate.32bit.stderr

@@ -1,20 +1,5 @@
-warning: shared reference of mutable static is discouraged
-  --> $DIR/const_refers_to_static_cross_crate.rs:12:14
-   |
-LL |     unsafe { &static_cross_crate::ZERO }
-   |              ^^^^^^^^^^^^^^^^^^^^^^^^^ shared reference of mutable static
-   |
-   = note: for more information, see issue #114447 <https://github.com/rust-lang/rust/issues/114447>
-   = note: reference of mutable static is a hard error from 2024 edition
-   = note: mutable statics can be written to by multiple threads: aliasing violations or data races will cause undefined behavior
-   = note: `#[warn(static_mut_ref)]` on by default
-help: shared references are dangerous since if there's any kind of mutation of that static while the reference lives, that's UB; use `addr_of!` instead to create a raw pointer
-   |
-LL |     unsafe { addr_of!(static_cross_crate::ZERO) }
-   |              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
 error[E0080]: it is undefined behavior to use this value
-  --> $DIR/const_refers_to_static_cross_crate.rs:10:1
+  --> $DIR/const_refers_to_static_cross_crate.rs:11:1
    |
 LL | const SLICE_MUT: &[u8; 1] = {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered reference to mutable memory in `const`
@@ -79,7 +64,7 @@ LL |         U8_MUT3 => true,
 warning: skipping const checks
    |
 help: skipping check for `const_refs_to_static` feature
-  --> $DIR/const_refers_to_static_cross_crate.rs:12:15
+  --> $DIR/const_refers_to_static_cross_crate.rs:13:15
    |
 LL |     unsafe { &static_cross_crate::ZERO }
    |               ^^^^^^^^^^^^^^^^^^^^^^^^
@@ -99,6 +84,6 @@ help: skipping check for `const_refs_to_static` feature
 LL |         match static_cross_crate::OPT_ZERO {
    |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: aborting due to 8 previous errors; 2 warnings emitted
+error: aborting due to 8 previous errors; 1 warning emitted
 
 For more information about this error, try `rustc --explain E0080`.

tests/ui/consts/miri_unleashed/const_refers_to_static_cross_crate.64bit.stderr

@@ -1,20 +1,5 @@
-warning: shared reference of mutable static is discouraged
-  --> $DIR/const_refers_to_static_cross_crate.rs:12:14
-   |
-LL |     unsafe { &static_cross_crate::ZERO }
-   |              ^^^^^^^^^^^^^^^^^^^^^^^^^ shared reference of mutable static
-   |
-   = note: for more information, see issue #114447 <https://github.com/rust-lang/rust/issues/114447>
-   = note: reference of mutable static is a hard error from 2024 edition
-   = note: mutable statics can be written to by multiple threads: aliasing violations or data races will cause undefined behavior
-   = note: `#[warn(static_mut_ref)]` on by default
-help: shared references are dangerous since if there's any kind of mutation of that static while the reference lives, that's UB; use `addr_of!` instead to create a raw pointer
-   |
-LL |     unsafe { addr_of!(static_cross_crate::ZERO) }
-   |              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
 error[E0080]: it is undefined behavior to use this value
-  --> $DIR/const_refers_to_static_cross_crate.rs:10:1
+  --> $DIR/const_refers_to_static_cross_crate.rs:11:1
    |
 LL | const SLICE_MUT: &[u8; 1] = {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered reference to mutable memory in `const`
@@ -79,7 +64,7 @@ LL |         U8_MUT3 => true,
 warning: skipping const checks
    |
 help: skipping check for `const_refs_to_static` feature
-  --> $DIR/const_refers_to_static_cross_crate.rs:12:15
+  --> $DIR/const_refers_to_static_cross_crate.rs:13:15
    |
 LL |     unsafe { &static_cross_crate::ZERO }
    |               ^^^^^^^^^^^^^^^^^^^^^^^^
@@ -99,6 +84,6 @@ help: skipping check for `const_refs_to_static` feature
 LL |         match static_cross_crate::OPT_ZERO {
    |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: aborting due to 8 previous errors; 2 warnings emitted
+error: aborting due to 8 previous errors; 1 warning emitted
 
 For more information about this error, try `rustc --explain E0080`.

tests/ui/consts/miri_unleashed/const_refers_to_static_cross_crate.rs

@@ -2,6 +2,7 @@
 // aux-build:static_cross_crate.rs
 // stderr-per-bitwidth
 #![feature(exclusive_range_pattern, half_open_range_patterns_in_slices)]
+#![allow(static_mut_ref)]
 
 extern crate static_cross_crate;
 
@@ -10,7 +11,6 @@ extern crate static_cross_crate;
 const SLICE_MUT: &[u8; 1] = { //~ ERROR undefined behavior
     //~| encountered reference to mutable memory
     unsafe { &static_cross_crate::ZERO }
-    //~^ WARN shared reference of mutable static is discouraged [static_mut_ref]
 };
 
 const U8_MUT: &u8 = { //~ ERROR undefined behavior

tests/ui/consts/static_mut_containing_mut_ref.rs

@@ -1,8 +1,8 @@
 // build-pass (FIXME(62277): could be check-pass?)
+#![allow(static_mut_ref)]
 
 static mut STDERR_BUFFER_SPACE: [u8; 42] = [0u8; 42];
 
 pub static mut STDERR_BUFFER: *mut [u8] = unsafe { &mut STDERR_BUFFER_SPACE };
-//~^ WARN mutable reference of mutable static is discouraged [static_mut_ref]
 
 fn main() {}

tests/ui/consts/static_mut_containing_mut_ref2.mut_refs.stderr

@@ -1,24 +1,9 @@
-warning: mutable reference of mutable static is discouraged
-  --> $DIR/static_mut_containing_mut_ref2.rs:8:6
-   |
-LL |     *(&mut STDERR_BUFFER_SPACE) = 42;
-   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^ mutable reference of mutable static
-   |
-   = note: for more information, see issue #114447 <https://github.com/rust-lang/rust/issues/114447>
-   = note: reference of mutable static is a hard error from 2024 edition
-   = note: mutable statics can be written to by multiple threads: aliasing violations or data races will cause undefined behavior
-   = note: `#[warn(static_mut_ref)]` on by default
-help: mutable references are dangerous since if there's any other pointer or reference used for that static while the reference lives, that's UB; use `addr_of_mut!` instead to create a raw pointer
-   |
-LL |     *addr_of_mut!(STDERR_BUFFER_SPACE) = 42;
-   |      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
 error[E0080]: could not evaluate static initializer
   --> $DIR/static_mut_containing_mut_ref2.rs:8:5
    |
 LL |     *(&mut STDERR_BUFFER_SPACE) = 42;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ modifying a static's initial value from another static's initializer
 
-error: aborting due to 1 previous error; 1 warning emitted
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0080`.

tests/ui/consts/static_mut_containing_mut_ref2.rs

@@ -1,5 +1,5 @@
 // revisions: stock mut_refs
-
+#![allow(static_mut_ref)]
 #![cfg_attr(mut_refs, feature(const_mut_refs))]
 
 static mut STDERR_BUFFER_SPACE: u8 = 0;
@@ -8,8 +8,6 @@ pub static mut STDERR_BUFFER: () = unsafe {
     *(&mut STDERR_BUFFER_SPACE) = 42;
     //[mut_refs]~^ ERROR could not evaluate static initializer
     //[stock]~^^ ERROR mutation through a reference is not allowed in statics
-    //[mut_refs]~^^^ WARN mutable reference of mutable static is discouraged [static_mut_ref]
-    //[stock]~^^^^ WARN mutable reference of mutable static is discouraged [static_mut_ref]
 };
 
 fn main() {}

tests/ui/consts/static_mut_containing_mut_ref2.stock.stderr

@@ -1,18 +1,3 @@
-warning: mutable reference of mutable static is discouraged
-  --> $DIR/static_mut_containing_mut_ref2.rs:8:6
-   |
-LL |     *(&mut STDERR_BUFFER_SPACE) = 42;
-   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^ mutable reference of mutable static
-   |
-   = note: for more information, see issue #114447 <https://github.com/rust-lang/rust/issues/114447>
-   = note: reference of mutable static is a hard error from 2024 edition
-   = note: mutable statics can be written to by multiple threads: aliasing violations or data races will cause undefined behavior
-   = note: `#[warn(static_mut_ref)]` on by default
-help: mutable references are dangerous since if there's any other pointer or reference used for that static while the reference lives, that's UB; use `addr_of_mut!` instead to create a raw pointer
-   |
-LL |     *addr_of_mut!(STDERR_BUFFER_SPACE) = 42;
-   |      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
 error[E0658]: mutation through a reference is not allowed in statics
   --> $DIR/static_mut_containing_mut_ref2.rs:8:5
    |
@@ -23,6 +8,6 @@ LL |     *(&mut STDERR_BUFFER_SPACE) = 42;
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
-error: aborting due to 1 previous error; 1 warning emitted
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0658`.

tests/ui/drop/drop_elaboration_with_errors.rs

@@ -0,0 +1,20 @@
+// can't use build-fail, because this also fails check-fail, but
+// the ICE from #120787 only reproduces on build-fail.
+// compile-flags: --emit=mir
+
+#![feature(type_alias_impl_trait)]
+
+struct Foo {
+    field: String,
+}
+
+type Tait = impl Sized;
+
+fn ice_cold(beverage: Tait) {
+    let Foo { field } = beverage;
+    _ = field;
+}
+
+fn main() {
+    Ok(()) //~ ERROR mismatched types
+}

tests/ui/drop/drop_elaboration_with_errors.stderr

@@ -0,0 +1,14 @@
+error[E0308]: mismatched types
+  --> $DIR/drop_elaboration_with_errors.rs:19:5
+   |
+LL | fn main() {
+   |          - expected `()` because of default return type
+LL |     Ok(())
+   |     ^^^^^^ expected `()`, found `Result<(), _>`
+   |
+   = note: expected unit type `()`
+                   found enum `Result<(), _>`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0308`.

tests/ui/generic-associated-types/equality-bound.rs

@@ -12,4 +12,71 @@ fn sum3<J: Iterator>(i: J) -> i32 where I::Item = i32 {
     panic!()
 }
 
+use std::iter::FromIterator;
+
+struct X {}
+
+impl FromIterator<bool> for X {
+    fn from_iter<T>(_: T) -> Self where T: IntoIterator, IntoIterator::Item = A,
+        //~^ ERROR equality constraints are not yet supported in `where` clauses
+        //~| ERROR cannot find type `A` in this scope
+    {
+        todo!()
+    }
+}
+
+struct Y {}
+
+impl FromIterator<bool> for Y {
+    fn from_iter<T>(_: T) -> Self where T: IntoIterator, T::Item = A,
+        //~^ ERROR equality constraints are not yet supported in `where` clauses
+        //~| ERROR cannot find type `A` in this scope
+    {
+        todo!()
+    }
+}
+
+struct Z {}
+
+impl FromIterator<bool> for Z {
+    fn from_iter<T: IntoIterator>(_: T) -> Self where IntoIterator::Item = A,
+        //~^ ERROR equality constraints are not yet supported in `where` clauses
+        //~| ERROR cannot find type `A` in this scope
+    {
+        todo!()
+    }
+}
+
+struct K {}
+
+impl FromIterator<bool> for K {
+    fn from_iter<T: IntoIterator>(_: T) -> Self where T::Item = A,
+        //~^ ERROR equality constraints are not yet supported in `where` clauses
+        //~| ERROR cannot find type `A` in this scope
+    {
+        todo!()
+    }
+}
+
+struct L {}
+
+impl FromIterator<bool> for L {
+    fn from_iter<T>(_: T) -> Self where IntoIterator::Item = A, T: IntoIterator,
+        //~^ ERROR equality constraints are not yet supported in `where` clauses
+        //~| ERROR cannot find type `A` in this scope
+    {
+        todo!()
+    }
+}
+
+struct M {}
+
+impl FromIterator<bool> for M {
+    fn from_iter<T>(_: T) -> Self where T::Item = A, T: IntoIterator,
+        //~^ ERROR equality constraints are not yet supported in `where` clauses
+        //~| ERROR cannot find type `A` in this scope
+    {
+        todo!()
+    }
+}
 fn main() {}

tests/ui/generic-associated-types/equality-bound.stderr

@@ -8,7 +8,7 @@ LL | fn sum<I: Iterator<Item = ()>>(i: I) -> i32 where I::Item = i32 {
 help: if `Iterator::Item` is an associated type you're trying to set, use the associated type binding syntax
    |
 LL - fn sum<I: Iterator<Item = ()>>(i: I) -> i32 where I::Item = i32 {
-LL + fn sum<I: Iterator<Item = (), Item = i32>>(i: I) -> i32 where  {
+LL + fn sum<I: Iterator<Item = (), Item = i32>>(i: I) -> i32  {
    |
 
 error: equality constraints are not yet supported in `where` clauses
@@ -21,7 +21,7 @@ LL | fn sum2<I: Iterator>(i: I) -> i32 where I::Item = i32 {
 help: if `Iterator::Item` is an associated type you're trying to set, use the associated type binding syntax
    |
 LL - fn sum2<I: Iterator>(i: I) -> i32 where I::Item = i32 {
-LL + fn sum2<I: Iterator<Item = i32>>(i: I) -> i32 where  {
+LL + fn sum2<I: Iterator<Item = i32>>(i: I) -> i32  {
    |
 
 error: equality constraints are not yet supported in `where` clauses
@@ -32,6 +32,138 @@ LL | fn sum3<J: Iterator>(i: J) -> i32 where I::Item = i32 {
    |
    = note: see issue #20041 <https://github.com/rust-lang/rust/issues/20041> for more information
 
+error: equality constraints are not yet supported in `where` clauses
+  --> $DIR/equality-bound.rs:20:58
+   |
+LL |     fn from_iter<T>(_: T) -> Self where T: IntoIterator, IntoIterator::Item = A,
+   |                                                          ^^^^^^^^^^^^^^^^^^^^^^ not supported
+   |
+   = note: see issue #20041 <https://github.com/rust-lang/rust/issues/20041> for more information
+help: if `IntoIterator::Item` is an associated type you're trying to set, use the associated type binding syntax
+   |
+LL -     fn from_iter<T>(_: T) -> Self where T: IntoIterator, IntoIterator::Item = A,
+LL +     fn from_iter<T>(_: T) -> Self where T: IntoIterator<Item = A>,
+   |
+
+error: equality constraints are not yet supported in `where` clauses
+  --> $DIR/equality-bound.rs:31:58
+   |
+LL |     fn from_iter<T>(_: T) -> Self where T: IntoIterator, T::Item = A,
+   |                                                          ^^^^^^^^^^^ not supported
+   |
+   = note: see issue #20041 <https://github.com/rust-lang/rust/issues/20041> for more information
+help: if `IntoIterator::Item` is an associated type you're trying to set, use the associated type binding syntax
+   |
+LL -     fn from_iter<T>(_: T) -> Self where T: IntoIterator, T::Item = A,
+LL +     fn from_iter<T>(_: T) -> Self where T: IntoIterator<Item = A>,
+   |
+
+error: equality constraints are not yet supported in `where` clauses
+  --> $DIR/equality-bound.rs:42:55
+   |
+LL |     fn from_iter<T: IntoIterator>(_: T) -> Self where IntoIterator::Item = A,
+   |                                                       ^^^^^^^^^^^^^^^^^^^^^^ not supported
+   |
+   = note: see issue #20041 <https://github.com/rust-lang/rust/issues/20041> for more information
+help: if `IntoIterator::Item` is an associated type you're trying to set, use the associated type binding syntax
+   |
+LL -     fn from_iter<T: IntoIterator>(_: T) -> Self where IntoIterator::Item = A,
+LL +     fn from_iter<T: IntoIterator<Item = A>>(_: T) -> Self 
+   |
+
+error: equality constraints are not yet supported in `where` clauses
+  --> $DIR/equality-bound.rs:53:55
+   |
+LL |     fn from_iter<T: IntoIterator>(_: T) -> Self where T::Item = A,
+   |                                                       ^^^^^^^^^^^ not supported
+   |
+   = note: see issue #20041 <https://github.com/rust-lang/rust/issues/20041> for more information
+help: if `IntoIterator::Item` is an associated type you're trying to set, use the associated type binding syntax
+   |
+LL -     fn from_iter<T: IntoIterator>(_: T) -> Self where T::Item = A,
+LL +     fn from_iter<T: IntoIterator<Item = A>>(_: T) -> Self 
+   |
+
+error: equality constraints are not yet supported in `where` clauses
+  --> $DIR/equality-bound.rs:64:41
+   |
+LL |     fn from_iter<T>(_: T) -> Self where IntoIterator::Item = A, T: IntoIterator,
+   |                                         ^^^^^^^^^^^^^^^^^^^^^^ not supported
+   |
+   = note: see issue #20041 <https://github.com/rust-lang/rust/issues/20041> for more information
+help: if `IntoIterator::Item` is an associated type you're trying to set, use the associated type binding syntax
+   |
+LL -     fn from_iter<T>(_: T) -> Self where IntoIterator::Item = A, T: IntoIterator,
+LL +     fn from_iter<T>(_: T) -> Self where T: IntoIterator<Item = A>,
+   |
+
+error: equality constraints are not yet supported in `where` clauses
+  --> $DIR/equality-bound.rs:75:41
+   |
+LL |     fn from_iter<T>(_: T) -> Self where T::Item = A, T: IntoIterator,
+   |                                         ^^^^^^^^^^^ not supported
+   |
+   = note: see issue #20041 <https://github.com/rust-lang/rust/issues/20041> for more information
+help: if `IntoIterator::Item` is an associated type you're trying to set, use the associated type binding syntax
+   |
+LL -     fn from_iter<T>(_: T) -> Self where T::Item = A, T: IntoIterator,
+LL +     fn from_iter<T>(_: T) -> Self where T: IntoIterator<Item = A>,
+   |
+
+error[E0412]: cannot find type `A` in this scope
+  --> $DIR/equality-bound.rs:20:79
+   |
+LL |     fn from_iter<T>(_: T) -> Self where T: IntoIterator, IntoIterator::Item = A,
+   |                                                                               ^ help: a struct with a similar name exists: `K`
+...
+LL | struct K {}
+   | -------- similarly named struct `K` defined here
+
+error[E0412]: cannot find type `A` in this scope
+  --> $DIR/equality-bound.rs:31:68
+   |
+LL |     fn from_iter<T>(_: T) -> Self where T: IntoIterator, T::Item = A,
+   |                                                                    ^ help: a struct with a similar name exists: `K`
+...
+LL | struct K {}
+   | -------- similarly named struct `K` defined here
+
+error[E0412]: cannot find type `A` in this scope
+  --> $DIR/equality-bound.rs:42:76
+   |
+LL |     fn from_iter<T: IntoIterator>(_: T) -> Self where IntoIterator::Item = A,
+   |                                                                            ^ help: a struct with a similar name exists: `K`
+...
+LL | struct K {}
+   | -------- similarly named struct `K` defined here
+
+error[E0412]: cannot find type `A` in this scope
+  --> $DIR/equality-bound.rs:53:65
+   |
+LL | struct K {}
+   | -------- similarly named struct `K` defined here
+...
+LL |     fn from_iter<T: IntoIterator>(_: T) -> Self where T::Item = A,
+   |                                                                 ^ help: a struct with a similar name exists: `K`
+
+error[E0412]: cannot find type `A` in this scope
+  --> $DIR/equality-bound.rs:64:62
+   |
+LL | struct K {}
+   | -------- similarly named struct `K` defined here
+...
+LL |     fn from_iter<T>(_: T) -> Self where IntoIterator::Item = A, T: IntoIterator,
+   |                                                              ^ help: a struct with a similar name exists: `K`
+
+error[E0412]: cannot find type `A` in this scope
+  --> $DIR/equality-bound.rs:75:51
+   |
+LL | struct K {}
+   | -------- similarly named struct `K` defined here
+...
+LL |     fn from_iter<T>(_: T) -> Self where T::Item = A, T: IntoIterator,
+   |                                                   ^ help: a struct with a similar name exists: `K`
+
 error[E0433]: failed to resolve: use of undeclared type `I`
   --> $DIR/equality-bound.rs:9:41
    |
@@ -41,6 +173,7 @@ LL | fn sum3<J: Iterator>(i: J) -> i32 where I::Item = i32 {
    |                                         use of undeclared type `I`
    |                                         help: a type parameter with a similar name exists: `J`
 
-error: aborting due to 4 previous errors
+error: aborting due to 16 previous errors
 
-For more information about this error, try `rustc --explain E0433`.
+Some errors have detailed explanations: E0412, E0433.
+For more information about an error, try `rustc --explain E0412`.

tests/ui/impl-trait/in-trait/default-body-type-err-2.stderr

@@ -1,6 +1,8 @@
 error[E0308]: mismatched types
   --> $DIR/default-body-type-err-2.rs:7:9
    |
+LL |     async fn woopsie_async(&self) -> String {
+   |                                      ------ expected `String` because of return type
 LL |         42
    |         ^^- help: try using a conversion method: `.to_string()`
    |         |

tests/ui/loops/dont-suggest-break-thru-item.rs

@@ -8,6 +8,7 @@ fn closure() {
             if true {
                 Err(1)
                 //~^ ERROR mismatched types
+                //~| HELP you might have meant to return this value
             }
 
             Ok(())
@@ -21,6 +22,7 @@ fn async_block() {
             if true {
                 Err(1)
                 //~^ ERROR mismatched types
+                //~| HELP you might have meant to return this value
             }
 
             Ok(())

tests/ui/loops/dont-suggest-break-thru-item.stderr

@@ -5,27 +5,37 @@ LL | /             if true {
 LL | |                 Err(1)
    | |                 ^^^^^^ expected `()`, found `Result<_, {integer}>`
 LL | |
+LL | |
 LL | |             }
    | |_____________- expected this to be `()`
    |
    = note: expected unit type `()`
                    found enum `Result<_, {integer}>`
+help: you might have meant to return this value
+   |
+LL |                 return Err(1);
+   |                 ++++++       +
 
 error[E0308]: mismatched types
-  --> $DIR/dont-suggest-break-thru-item.rs:22:17
+  --> $DIR/dont-suggest-break-thru-item.rs:23:17
    |
 LL | /             if true {
 LL | |                 Err(1)
    | |                 ^^^^^^ expected `()`, found `Result<_, {integer}>`
 LL | |
+LL | |
 LL | |             }
    | |_____________- expected this to be `()`
    |
    = note: expected unit type `()`
                    found enum `Result<_, {integer}>`
+help: you might have meant to return this value
+   |
+LL |                 return Err(1);
+   |                 ++++++       +
 
 error[E0308]: mismatched types
-  --> $DIR/dont-suggest-break-thru-item.rs:35:17
+  --> $DIR/dont-suggest-break-thru-item.rs:37:17
    |
 LL | /             if true {
 LL | |                 Err(1)
@@ -38,7 +48,7 @@ LL | |             }
                    found enum `Result<_, {integer}>`
 
 error[E0308]: mismatched types
-  --> $DIR/dont-suggest-break-thru-item.rs:47:17
+  --> $DIR/dont-suggest-break-thru-item.rs:49:17
    |
 LL | /             if true {
 LL | |                 Err(1)

tests/ui/thread-local/thread-local-static.rs

@@ -2,14 +2,14 @@
 
 #![feature(thread_local)]
 #![feature(const_swap)]
+#![allow(static_mut_ref)]
 
 #[thread_local]
 static mut STATIC_VAR_2: [u32; 8] = [4; 8];
 const fn g(x: &mut [u32; 8]) {
     //~^ ERROR mutable references are not allowed
     std::mem::swap(x, &mut STATIC_VAR_2)
-    //~^ WARN mutable reference of mutable static is discouraged [static_mut_ref]
-    //~^^ ERROR thread-local statics cannot be accessed
+    //~^ ERROR thread-local statics cannot be accessed
     //~| ERROR mutable references are not allowed
     //~| ERROR use of mutable static is unsafe
 }

tests/ui/thread-local/thread-local-static.stderr

@@ -1,28 +1,13 @@
-warning: mutable reference of mutable static is discouraged
-  --> $DIR/thread-local-static.rs:10:23
-   |
-LL |     std::mem::swap(x, &mut STATIC_VAR_2)
-   |                       ^^^^^^^^^^^^^^^^^ mutable reference of mutable static
-   |
-   = note: for more information, see issue #114447 <https://github.com/rust-lang/rust/issues/114447>
-   = note: reference of mutable static is a hard error from 2024 edition
-   = note: mutable statics can be written to by multiple threads: aliasing violations or data races will cause undefined behavior
-   = note: `#[warn(static_mut_ref)]` on by default
-help: mutable references are dangerous since if there's any other pointer or reference used for that static while the reference lives, that's UB; use `addr_of_mut!` instead to create a raw pointer
-   |
-LL |     std::mem::swap(x, addr_of_mut!(STATIC_VAR_2))
-   |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~
-
 error[E0133]: use of mutable static is unsafe and requires unsafe function or block
-  --> $DIR/thread-local-static.rs:10:28
+  --> $DIR/thread-local-static.rs:11:28
    |
 LL |     std::mem::swap(x, &mut STATIC_VAR_2)
    |                            ^^^^^^^^^^^^ use of mutable static
    |
    = note: mutable statics can be mutated by multiple threads: aliasing violations or data races will cause undefined behavior
 
 error[E0658]: mutable references are not allowed in constant functions
-  --> $DIR/thread-local-static.rs:8:12
+  --> $DIR/thread-local-static.rs:9:12
    |
 LL | const fn g(x: &mut [u32; 8]) {
    |            ^
@@ -32,13 +17,13 @@ LL | const fn g(x: &mut [u32; 8]) {
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0625]: thread-local statics cannot be accessed at compile-time
-  --> $DIR/thread-local-static.rs:10:28
+  --> $DIR/thread-local-static.rs:11:28
    |
 LL |     std::mem::swap(x, &mut STATIC_VAR_2)
    |                            ^^^^^^^^^^^^
 
 error[E0658]: mutable references are not allowed in constant functions
-  --> $DIR/thread-local-static.rs:10:23
+  --> $DIR/thread-local-static.rs:11:23
    |
 LL |     std::mem::swap(x, &mut STATIC_VAR_2)
    |                       ^^^^^^^^^^^^^^^^^
@@ -47,7 +32,7 @@ LL |     std::mem::swap(x, &mut STATIC_VAR_2)
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
-error: aborting due to 4 previous errors; 1 warning emitted
+error: aborting due to 4 previous errors
 
 Some errors have detailed explanations: E0133, E0625, E0658.
 For more information about an error, try `rustc --explain E0133`.