[stable] Prepare the 1.87.0 release

compiler/rustc_attr_parsing/src/parser.rs

@@ -13,7 +13,7 @@ use rustc_ast_pretty::pprust;
 use rustc_errors::DiagCtxtHandle;
 use rustc_hir::{self as hir, AttrPath};
 use rustc_span::symbol::{Ident, kw, sym};
-use rustc_span::{ErrorGuaranteed, Span, Symbol};
+use rustc_span::{Span, Symbol};
 
 pub struct SegmentIterator<'a> {
     offset: usize,
@@ -176,7 +176,7 @@ impl<'a> ArgParser<'a> {
 pub enum MetaItemOrLitParser<'a> {
     MetaItemParser(MetaItemParser<'a>),
     Lit(MetaItemLit),
-    Err(Span, ErrorGuaranteed),
+    Err(Span),
 }
 
 impl<'a> MetaItemOrLitParser<'a> {
@@ -186,7 +186,7 @@ impl<'a> MetaItemOrLitParser<'a> {
                 generic_meta_item_parser.span()
             }
             MetaItemOrLitParser::Lit(meta_item_lit) => meta_item_lit.span,
-            MetaItemOrLitParser::Err(span, _) => *span,
+            MetaItemOrLitParser::Err(span) => *span,
         }
     }
 
@@ -495,12 +495,9 @@ impl<'a> MetaItemListParserContext<'a> {
                 // where the macro didn't expand to a literal. An error is already given
                 // for this at this point, and then we do continue. This makes this path
                 // reachable...
-                let e = self.dcx.span_delayed_bug(
-                    *span,
-                    "expr in place where literal is expected (builtin attr parsing)",
-                );
-
-                return Some(MetaItemOrLitParser::Err(*span, e));
+                // NOTE: For backward compatibility we can't emit any error / delayed bug here (yet).
+                //       See <https://github.com/rust-lang/rust/issues/140612>
+                return Some(MetaItemOrLitParser::Err(*span));
             } else {
                 self.next_path()?
             };

compiler/rustc_hir_analysis/src/hir_ty_lowering/dyn_compatibility.rs

@@ -146,7 +146,14 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
 
         let principal_trait = regular_traits.into_iter().next();
 
-        let mut needed_associated_types = vec![];
+        // A stable ordering of associated types from the principal trait and all its
+        // supertraits. We use this to ensure that different substitutions of a trait
+        // don't result in `dyn Trait` types with different projections lists, which
+        // can be unsound: <https://github.com/rust-lang/rust/pull/136458>.
+        // We achieve a stable ordering by walking over the unsubstituted principal
+        // trait ref.
+        let mut ordered_associated_types = vec![];
+
         if let Some((principal_trait, ref spans)) = principal_trait {
             let principal_trait = principal_trait.map_bound(|trait_pred| {
                 assert_eq!(trait_pred.polarity, ty::PredicatePolarity::Positive);
@@ -171,16 +178,13 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                         // FIXME(negative_bounds): Handle this correctly...
                         let trait_ref =
                             tcx.anonymize_bound_vars(bound_predicate.rebind(pred.trait_ref));
-                        needed_associated_types.extend(
+                        ordered_associated_types.extend(
                             tcx.associated_items(pred.trait_ref.def_id)
                                 .in_definition_order()
                                 // We only care about associated types.
                                 .filter(|item| item.kind == ty::AssocKind::Type)
                                 // No RPITITs -- they're not dyn-compatible for now.
                                 .filter(|item| !item.is_impl_trait_in_trait())
-                                // If the associated type has a `where Self: Sized` bound,
-                                // we do not need to constrain the associated type.
-                                .filter(|item| !tcx.generics_require_sized_self(item.def_id))
                                 .map(|item| (item.def_id, trait_ref)),
                         );
                     }
@@ -252,14 +256,26 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             }
         }
 
+        // We compute the list of projection bounds taking the ordered associated types,
+        // and check if there was an entry in the collected `projection_bounds`. Those
+        // are computed by first taking the user-written associated types, then elaborating
+        // the principal trait ref, and only using those if there was no user-written.
+        // See note below about how we handle missing associated types with `Self: Sized`,
+        // which are not required to be provided, but are still used if they are provided.
         let mut missing_assoc_types = FxIndexSet::default();
-        let projection_bounds: Vec<_> = needed_associated_types
+        let projection_bounds: Vec<_> = ordered_associated_types
             .into_iter()
             .filter_map(|key| {
                 if let Some(assoc) = projection_bounds.get(&key) {
                     Some(*assoc)
                 } else {
-                    missing_assoc_types.insert(key);
+                    // If the associated type has a `where Self: Sized` bound, then
+                    // we do not need to provide the associated type. This results in
+                    // a `dyn Trait` type that has a different number of projection
+                    // bounds, which may lead to type mismatches.
+                    if !tcx.generics_require_sized_self(key.0) {
+                        missing_assoc_types.insert(key);
+                    }
                     None
                 }
             })

compiler/rustc_middle/src/ty/sty.rs

@@ -720,7 +720,10 @@ impl<'tcx> Ty<'tcx> {
         repr: DynKind,
     ) -> Ty<'tcx> {
         if cfg!(debug_assertions) {
-            let projection_count = obj.projection_bounds().count();
+            let projection_count = obj
+                .projection_bounds()
+                .filter(|item| !tcx.generics_require_sized_self(item.item_def_id()))
+                .count();
             let expected_count: usize = obj
                 .principal_def_id()
                 .into_iter()

src/ci/channel

@@ -1 +1 @@
-beta
+stable

src/tools/clippy/clippy_lints/src/entry.rs

@@ -95,14 +95,13 @@ impl<'tcx> LateLintPass<'tcx> for HashMapPass {
                 return;
             };
 
-            if then_search.is_key_used_and_no_copy || else_search.is_key_used_and_no_copy {
-                span_lint(cx, MAP_ENTRY, expr.span, lint_msg);
-                return;
-            }
-
             if then_search.edits.is_empty() && else_search.edits.is_empty() {
                 // No insertions
                 return;
+            } else if then_search.is_key_used_and_no_copy || else_search.is_key_used_and_no_copy {
+                // If there are other uses of the key, and the key is not copy,
+                // we cannot perform a fix automatically, but continue to emit a lint.
+                None
             } else if then_search.edits.is_empty() || else_search.edits.is_empty() {
                 // if .. { insert } else { .. } or if .. { .. } else { insert }
                 let ((then_str, entry_kind), else_str) = match (else_search.edits.is_empty(), contains_expr.negated) {
@@ -123,10 +122,10 @@ impl<'tcx> LateLintPass<'tcx> for HashMapPass {
                         snippet_with_applicability(cx, then_expr.span, "{ .. }", &mut app),
                     ),
                 };
-                format!(
+                Some(format!(
                     "if let {}::{entry_kind} = {map_str}.entry({key_str}) {then_str} else {else_str}",
                     map_ty.entry_path(),
-                )
+                ))
             } else {
                 // if .. { insert } else { insert }
                 let ((then_str, then_entry), (else_str, else_entry)) = if contains_expr.negated {
@@ -142,13 +141,13 @@ impl<'tcx> LateLintPass<'tcx> for HashMapPass {
                 };
                 let indent_str = snippet_indent(cx, expr.span);
                 let indent_str = indent_str.as_deref().unwrap_or("");
-                format!(
+                Some(format!(
                     "match {map_str}.entry({key_str}) {{\n{indent_str}    {entry}::{then_entry} => {}\n\
                         {indent_str}    {entry}::{else_entry} => {}\n{indent_str}}}",
                     reindent_multiline(&then_str, true, Some(4 + indent_str.len())),
                     reindent_multiline(&else_str, true, Some(4 + indent_str.len())),
                     entry = map_ty.entry_path(),
-                )
+                ))
             }
         } else {
             if then_search.edits.is_empty() {
@@ -163,17 +162,17 @@ impl<'tcx> LateLintPass<'tcx> for HashMapPass {
                 } else {
                     then_search.snippet_occupied(cx, then_expr.span, &mut app)
                 };
-                format!(
+                Some(format!(
                     "if let {}::{entry_kind} = {map_str}.entry({key_str}) {body_str}",
                     map_ty.entry_path(),
-                )
+                ))
             } else if let Some(insertion) = then_search.as_single_insertion() {
                 let value_str = snippet_with_context(cx, insertion.value.span, then_expr.span.ctxt(), "..", &mut app).0;
                 if contains_expr.negated {
                     if insertion.value.can_have_side_effects() {
-                        format!("{map_str}.entry({key_str}).or_insert_with(|| {value_str});")
+                        Some(format!("{map_str}.entry({key_str}).or_insert_with(|| {value_str});"))
                     } else {
-                        format!("{map_str}.entry({key_str}).or_insert({value_str});")
+                        Some(format!("{map_str}.entry({key_str}).or_insert({value_str});"))
                     }
                 } else {
                     // TODO: suggest using `if let Some(v) = map.get_mut(k) { .. }` here.
@@ -183,7 +182,7 @@ impl<'tcx> LateLintPass<'tcx> for HashMapPass {
             } else {
                 let block_str = then_search.snippet_closure(cx, then_expr.span, &mut app);
                 if contains_expr.negated {
-                    format!("{map_str}.entry({key_str}).or_insert_with(|| {block_str});")
+                    Some(format!("{map_str}.entry({key_str}).or_insert_with(|| {block_str});"))
                 } else {
                     // TODO: suggest using `if let Some(v) = map.get_mut(k) { .. }` here.
                     // This would need to be a different lint.
@@ -192,7 +191,11 @@ impl<'tcx> LateLintPass<'tcx> for HashMapPass {
             }
         };
 
-        span_lint_and_sugg(cx, MAP_ENTRY, expr.span, lint_msg, "try", sugg, app);
+        if let Some(sugg) = sugg {
+            span_lint_and_sugg(cx, MAP_ENTRY, expr.span, lint_msg, "try", sugg, app);
+        } else {
+            span_lint(cx, MAP_ENTRY, expr.span, lint_msg);
+        }
     }
 }
 

src/tools/clippy/clippy_lints/src/matches/manual_ok_err.rs

@@ -85,7 +85,7 @@ fn is_variant_or_wildcard(cx: &LateContext<'_>, pat: &Pat<'_>, can_be_wild: bool
 /// contains `Err(IDENT)`, `None` otherwise.
 fn is_ok_or_err<'hir>(cx: &LateContext<'_>, pat: &Pat<'hir>) -> Option<(bool, &'hir Ident)> {
     if let PatKind::TupleStruct(qpath, [arg], _) = &pat.kind
-        && let PatKind::Binding(BindingMode::NONE, _, ident, _) = &arg.kind
+        && let PatKind::Binding(BindingMode::NONE, _, ident, None) = &arg.kind
         && let res = cx.qpath_res(qpath, pat.hir_id)
         && let Res::Def(DefKind::Ctor(..), id) = res
         && let id @ Some(_) = cx.tcx.opt_parent(id)

src/tools/clippy/clippy_lints/src/ptr.rs

@@ -786,9 +786,9 @@ fn check_ptr_eq<'tcx>(
     }
 
     // Remove one level of usize conversion if any
-    let (left, right) = match (expr_as_cast_to_usize(cx, left), expr_as_cast_to_usize(cx, right)) {
-        (Some(lhs), Some(rhs)) => (lhs, rhs),
-        _ => (left, right),
+    let (left, right, usize_peeled) = match (expr_as_cast_to_usize(cx, left), expr_as_cast_to_usize(cx, right)) {
+        (Some(lhs), Some(rhs)) => (lhs, rhs, true),
+        _ => (left, right, false),
     };
 
     // This lint concerns raw pointers
@@ -797,10 +797,16 @@ fn check_ptr_eq<'tcx>(
         return;
     }
 
-    let (left_var, right_var) = (peel_raw_casts(cx, left, left_ty), peel_raw_casts(cx, right, right_ty));
+    let ((left_var, left_casts_peeled), (right_var, right_casts_peeled)) =
+        (peel_raw_casts(cx, left, left_ty), peel_raw_casts(cx, right, right_ty));
 
-    if let Some(left_snip) = left_var.span.get_source_text(cx)
-        && let Some(right_snip) = right_var.span.get_source_text(cx)
+    if !(usize_peeled || left_casts_peeled || right_casts_peeled) {
+        return;
+    }
+
+    let mut app = Applicability::MachineApplicable;
+    let left_snip = Sugg::hir_with_context(cx, left_var, expr.span.ctxt(), "_", &mut app);
+    let right_snip = Sugg::hir_with_context(cx, right_var, expr.span.ctxt(), "_", &mut app);
     {
         let Some(top_crate) = std_or_core(cx) else { return };
         let invert = if op == BinOpKind::Eq { "" } else { "!" };
@@ -811,15 +817,16 @@ fn check_ptr_eq<'tcx>(
             format!("use `{top_crate}::ptr::eq` when comparing raw pointers"),
             "try",
             format!("{invert}{top_crate}::ptr::eq({left_snip}, {right_snip})"),
-            Applicability::MachineApplicable,
+            app,
         );
     }
 }
 
 // If the given expression is a cast to a usize, return the lhs of the cast
 // E.g., `foo as *const _ as usize` returns `foo as *const _`.
 fn expr_as_cast_to_usize<'tcx>(cx: &LateContext<'tcx>, cast_expr: &'tcx Expr<'_>) -> Option<&'tcx Expr<'tcx>> {
-    if cx.typeck_results().expr_ty(cast_expr) == cx.tcx.types.usize
+    if !cast_expr.span.from_expansion()
+        && cx.typeck_results().expr_ty(cast_expr) == cx.tcx.types.usize
         && let ExprKind::Cast(expr, _) = cast_expr.kind
     {
         Some(expr)
@@ -828,16 +835,18 @@ fn expr_as_cast_to_usize<'tcx>(cx: &LateContext<'tcx>, cast_expr: &'tcx Expr<'_>
     }
 }
 
-// Peel raw casts if the remaining expression can be coerced to it
-fn peel_raw_casts<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>, expr_ty: Ty<'tcx>) -> &'tcx Expr<'tcx> {
-    if let ExprKind::Cast(inner, _) = expr.kind
+// Peel raw casts if the remaining expression can be coerced to it, and whether casts have been
+// peeled or not.
+fn peel_raw_casts<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>, expr_ty: Ty<'tcx>) -> (&'tcx Expr<'tcx>, bool) {
+    if !expr.span.from_expansion()
+        && let ExprKind::Cast(inner, _) = expr.kind
         && let ty::RawPtr(target_ty, _) = expr_ty.kind()
         && let inner_ty = cx.typeck_results().expr_ty(inner)
         && let ty::RawPtr(inner_target_ty, _) | ty::Ref(_, inner_target_ty, _) = inner_ty.kind()
         && target_ty == inner_target_ty
     {
-        peel_raw_casts(cx, inner, inner_ty)
+        (peel_raw_casts(cx, inner, inner_ty).0, true)
     } else {
-        expr
+        (expr, false)
     }
 }

src/tools/clippy/tests/ui/entry.fixed

@@ -226,4 +226,26 @@ fn issue11976() {
     }
 }
 
+mod issue14449 {
+    use std::collections::BTreeMap;
+
+    pub struct Meow {
+        map: BTreeMap<String, String>,
+    }
+
+    impl Meow {
+        fn pet(&self, _key: &str, _v: u32) -> u32 {
+            42
+        }
+    }
+
+    pub fn f(meow: &Meow, x: String) {
+        if meow.map.contains_key(&x) {
+            let _ = meow.pet(&x, 1);
+        } else {
+            let _ = meow.pet(&x, 0);
+        }
+    }
+}
+
 fn main() {}

src/tools/clippy/tests/ui/entry.rs

@@ -232,4 +232,26 @@ fn issue11976() {
     }
 }
 
+mod issue14449 {
+    use std::collections::BTreeMap;
+
+    pub struct Meow {
+        map: BTreeMap<String, String>,
+    }
+
+    impl Meow {
+        fn pet(&self, _key: &str, _v: u32) -> u32 {
+            42
+        }
+    }
+
+    pub fn f(meow: &Meow, x: String) {
+        if meow.map.contains_key(&x) {
+            let _ = meow.pet(&x, 1);
+        } else {
+            let _ = meow.pet(&x, 0);
+        }
+    }
+}
+
 fn main() {}

src/tools/clippy/tests/ui/manual_ok_err.fixed

@@ -80,6 +80,11 @@ fn no_lint() {
         Ok(3) => None,
         Ok(v) => Some(v),
     };
+
+    let _ = match funcall() {
+        Ok(v @ 1..) => Some(v),
+        _ => None,
+    };
 }
 
 const fn cf(x: Result<u32, &'static str>) -> Option<u32> {

src/tools/clippy/tests/ui/manual_ok_err.rs

@@ -116,6 +116,11 @@ fn no_lint() {
         Ok(3) => None,
         Ok(v) => Some(v),
     };
+
+    let _ = match funcall() {
+        Ok(v @ 1..) => Some(v),
+        _ => None,
+    };
 }
 
 const fn cf(x: Result<u32, &'static str>) -> Option<u32> {

src/tools/clippy/tests/ui/manual_ok_err.stderr

@@ -94,7 +94,7 @@ LL | |     };
    | |_____^ help: replace with: `(-S).ok()`
 
 error: manual implementation of `ok`
-  --> tests/ui/manual_ok_err.rs:132:12
+  --> tests/ui/manual_ok_err.rs:137:12
    |
 LL |       } else if let Ok(n) = "1".parse::<u8>() {
    |  ____________^