Rollup of 9 pull requests

Cargo.lock

@@ -6195,16 +6195,11 @@ dependencies = [
 
 [[package]]
 name = "windows-bindgen"
-version = "0.58.0"
+version = "0.59.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91cd28d93c692351f3a6e5615567c56756e330bee1c99c6bdd57bfc5ab15f589"
+checksum = "9b7fb600834d7e868f6e5bb748a86101427330fafbf9485c331b9d5f562d54a5"
 dependencies = [
- "proc-macro2",
  "rayon",
- "serde",
- "serde_json",
- "syn 2.0.96",
- "windows-metadata",
 ]
 
 [[package]]
@@ -6285,12 +6280,6 @@ dependencies = [
  "syn 2.0.96",
 ]
 
-[[package]]
-name = "windows-metadata"
-version = "0.58.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2e837f3c3012cfe9e7086302a93f441a7999439be1ad4c530d55d2f6d2921809"
-
 [[package]]
 name = "windows-result"
 version = "0.1.2"

compiler/rustc_const_eval/src/interpret/call.rs

@@ -241,7 +241,8 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
         interp_ok(caller == callee)
     }
 
-    fn check_argument_compat(
+    /// Returns a `bool` saying whether the two arguments are ABI-compatible.
+    pub fn check_argument_compat(
         &self,
         caller_abi: &ArgAbi<'tcx, Ty<'tcx>>,
         callee_abi: &ArgAbi<'tcx, Ty<'tcx>>,

compiler/rustc_lint/src/unused.rs

@@ -1,5 +1,4 @@
 use std::iter;
-use std::ops::ControlFlow;
 
 use rustc_ast as ast;
 use rustc_ast::util::{classify, parser};
@@ -781,29 +780,6 @@ trait UnusedDelimLint {
         right_pos: Option<BytePos>,
         is_kw: bool,
     ) {
-        // If `value` has `ExprKind::Err`, unused delim lint can be broken.
-        // For example, the following code caused ICE.
-        // This is because the `ExprKind::Call` in `value` has `ExprKind::Err` as its argument
-        // and this leads to wrong spans. #104897
-        //
-        // ```
-        // fn f(){(print!(á
-        // ```
-        use rustc_ast::visit::{Visitor, walk_expr};
-        struct ErrExprVisitor;
-        impl<'ast> Visitor<'ast> for ErrExprVisitor {
-            type Result = ControlFlow<()>;
-            fn visit_expr(&mut self, expr: &'ast ast::Expr) -> ControlFlow<()> {
-                if let ExprKind::Err(_) = expr.kind {
-                    ControlFlow::Break(())
-                } else {
-                    walk_expr(self, expr)
-                }
-            }
-        }
-        if ErrExprVisitor.visit_expr(value).is_break() {
-            return;
-        }
         let spans = match value.kind {
             ast::ExprKind::Block(ref block, None) if let [stmt] = block.stmts.as_slice() => stmt
                 .span

compiler/rustc_mir_build/src/thir/pattern/mod.rs

@@ -189,7 +189,7 @@ impl<'a, 'tcx> PatCtxt<'a, 'tcx> {
 
         // Lower the endpoint into a temporary `PatKind` that will then be
         // deconstructed to obtain the constant value and other data.
-        let mut kind: PatKind<'tcx> = self.lower_lit(expr);
+        let mut kind: PatKind<'tcx> = self.lower_pat_expr(expr);
 
         // Unpeel any ascription or inline-const wrapper nodes.
         loop {
@@ -353,7 +353,7 @@ impl<'a, 'tcx> PatCtxt<'a, 'tcx> {
 
             hir::PatKind::Never => PatKind::Never,
 
-            hir::PatKind::Expr(value) => self.lower_lit(value),
+            hir::PatKind::Expr(value) => self.lower_pat_expr(value),
 
             hir::PatKind::Range(ref lo_expr, ref hi_expr, end) => {
                 let (lo_expr, hi_expr) = (lo_expr.as_deref(), hi_expr.as_deref());
@@ -638,54 +638,57 @@ impl<'a, 'tcx> PatCtxt<'a, 'tcx> {
         let ty = self.typeck_results.node_type(id);
         let res = self.typeck_results.qpath_res(qpath, id);
 
-        let pat_from_kind = |kind| Box::new(Pat { span, ty, kind });
-
-        let (def_id, is_associated_const) = match res {
-            Res::Def(DefKind::Const, def_id) => (def_id, false),
-            Res::Def(DefKind::AssocConst, def_id) => (def_id, true),
+        let (def_id, user_ty) = match res {
+            Res::Def(DefKind::Const, def_id) => (def_id, None),
+            Res::Def(DefKind::AssocConst, def_id) => {
+                (def_id, self.typeck_results.user_provided_types().get(id))
+            }
 
-            _ => return pat_from_kind(self.lower_variant_or_leaf(res, id, span, ty, vec![])),
+            _ => {
+                // The path isn't the name of a constant, so it must actually
+                // be a unit struct or unit variant (e.g. `Option::None`).
+                let kind = self.lower_variant_or_leaf(res, id, span, ty, vec![]);
+                return Box::new(Pat { span, ty, kind });
+            }
         };
 
+        // Lower the named constant to a THIR pattern.
         let args = self.typeck_results.node_args(id);
         let c = ty::Const::new_unevaluated(self.tcx, ty::UnevaluatedConst { def: def_id, args });
         let subpattern = self.const_to_pat(c, ty, id, span);
-        let pattern = Box::new(Pat {
-            span,
-            ty,
-            kind: PatKind::ExpandedConstant { subpattern, def_id, is_inline: false },
-        });
 
-        if !is_associated_const {
-            return pattern;
-        }
+        // Wrap the pattern in a marker node to indicate that it is the result
+        // of lowering a named constant. This marker is used for improved
+        // diagnostics in some situations, but has no effect at runtime.
+        let mut pattern = {
+            let kind = PatKind::ExpandedConstant { subpattern, def_id, is_inline: false };
+            Box::new(Pat { span, ty, kind })
+        };
 
-        let user_provided_types = self.typeck_results.user_provided_types();
-        if let Some(&user_ty) = user_provided_types.get(id) {
+        // If this is an associated constant with an explicit user-written
+        // type, add an ascription node (e.g. `<Foo<'a> as MyTrait>::CONST`).
+        if let Some(&user_ty) = user_ty {
             let annotation = CanonicalUserTypeAnnotation {
                 user_ty: Box::new(user_ty),
                 span,
                 inferred_ty: self.typeck_results.node_type(id),
             };
-            Box::new(Pat {
-                span,
-                kind: PatKind::AscribeUserType {
-                    subpattern: pattern,
-                    ascription: Ascription {
-                        annotation,
-                        // Note that use `Contravariant` here. See the
-                        // `variance` field documentation for details.
-                        variance: ty::Contravariant,
-                    },
+            let kind = PatKind::AscribeUserType {
+                subpattern: pattern,
+                ascription: Ascription {
+                    annotation,
+                    // Note that we use `Contravariant` here. See the
+                    // `variance` field documentation for details.
+                    variance: ty::Contravariant,
                 },
-                ty,
-            })
-        } else {
-            pattern
+            };
+            pattern = Box::new(Pat { span, kind, ty });
         }
+
+        pattern
     }
 
-    /// Converts inline const patterns.
+    /// Lowers an inline const block (e.g. `const { 1 + 1 }`) to a pattern.
     fn lower_inline_const(
         &mut self,
         block: &'tcx hir::ConstBlock,
@@ -705,14 +708,17 @@ impl<'a, 'tcx> PatCtxt<'a, 'tcx> {
 
         let ct = ty::UnevaluatedConst { def: def_id.to_def_id(), args };
         let subpattern = self.const_to_pat(ty::Const::new_unevaluated(self.tcx, ct), ty, id, span);
+
+        // Wrap the pattern in a marker node to indicate that it is the result
+        // of lowering an inline const block.
         PatKind::ExpandedConstant { subpattern, def_id: def_id.to_def_id(), is_inline: true }
     }
 
-    /// Converts literals, paths and negation of literals to patterns.
-    /// The special case for negation exists to allow things like `-128_i8`
-    /// which would overflow if we tried to evaluate `128_i8` and then negate
-    /// afterwards.
-    fn lower_lit(&mut self, expr: &'tcx hir::PatExpr<'tcx>) -> PatKind<'tcx> {
+    /// Lowers the kinds of "expression" that can appear in a HIR pattern:
+    /// - Paths (e.g. `FOO`, `foo::BAR`, `Option::None`)
+    /// - Inline const blocks (e.g. `const { 1 + 1 }`)
+    /// - Literals, possibly negated (e.g. `-128u8`, `"hello"`)
+    fn lower_pat_expr(&mut self, expr: &'tcx hir::PatExpr<'tcx>) -> PatKind<'tcx> {
         let (lit, neg) = match &expr.kind {
             hir::PatExprKind::Path(qpath) => {
                 return self.lower_path(qpath, expr.hir_id, expr.span).kind;

library/alloc/src/string.rs

@@ -2442,6 +2442,32 @@ impl<'a> Extend<Cow<'a, str>> for String {
     }
 }
 
+#[cfg(not(no_global_oom_handling))]
+#[unstable(feature = "ascii_char", issue = "110998")]
+impl Extend<core::ascii::Char> for String {
+    fn extend<I: IntoIterator<Item = core::ascii::Char>>(&mut self, iter: I) {
+        self.vec.extend(iter.into_iter().map(|c| c.to_u8()));
+    }
+
+    #[inline]
+    fn extend_one(&mut self, c: core::ascii::Char) {
+        self.vec.push(c.to_u8());
+    }
+}
+
+#[cfg(not(no_global_oom_handling))]
+#[unstable(feature = "ascii_char", issue = "110998")]
+impl<'a> Extend<&'a core::ascii::Char> for String {
+    fn extend<I: IntoIterator<Item = &'a core::ascii::Char>>(&mut self, iter: I) {
+        self.extend(iter.into_iter().cloned());
+    }
+
+    #[inline]
+    fn extend_one(&mut self, c: &'a core::ascii::Char) {
+        self.vec.push(c.to_u8());
+    }
+}
+
 /// A convenience impl that delegates to the impl for `&str`.
 ///
 /// # Examples

library/core/src/iter/mod.rs

@@ -420,14 +420,14 @@ pub use self::adapters::{Intersperse, IntersperseWith};
     issue = "42168"
 )]
 pub use self::range::Step;
+#[stable(feature = "iter_empty", since = "1.2.0")]
+pub use self::sources::{Empty, empty};
 #[unstable(
     feature = "iter_from_coroutine",
     issue = "43122",
     reason = "coroutines are unstable"
 )]
-pub use self::sources::from_coroutine;
-#[stable(feature = "iter_empty", since = "1.2.0")]
-pub use self::sources::{Empty, empty};
+pub use self::sources::{FromCoroutine, from_coroutine};
 #[stable(feature = "iter_from_fn", since = "1.34.0")]
 pub use self::sources::{FromFn, from_fn};
 #[stable(feature = "iter_once", since = "1.2.0")]

library/core/src/iter/sources.rs

@@ -15,7 +15,7 @@ pub use self::empty::{Empty, empty};
     issue = "43122",
     reason = "coroutines are unstable"
 )]
-pub use self::from_coroutine::from_coroutine;
+pub use self::from_coroutine::{FromCoroutine, from_coroutine};
 #[stable(feature = "iter_from_fn", since = "1.34.0")]
 pub use self::from_fn::{FromFn, from_fn};
 #[stable(feature = "iter_once", since = "1.2.0")]

library/core/src/num/niche_types.rs

@@ -32,6 +32,16 @@ macro_rules! define_valid_range_type {
         };
 
         impl $name {
+            #[inline]
+            pub const fn new(val: $int) -> Option<Self> {
+                if (val as $uint) >= ($low as $uint) && (val as $uint) <= ($high as $uint) {
+                    // SAFETY: just checked the inclusive range
+                    Some(unsafe { $name(val) })
+                } else {
+                    None
+                }
+            }
+
             /// Constructs an instance of this type from the underlying integer
             /// primitive without checking whether its zero.
             ///

library/coretests/tests/ascii_char.rs

@@ -26,3 +26,15 @@ fn test_debug_control() {
         assert_eq!(want, format!("{chr:?}"), "byte: {byte}");
     }
 }
+
+/// Tests Extend implementation for ascii::Char.
+#[test]
+fn test_extend() {
+    let mut s = String::from("abc");
+    s.extend_one(Char::SmallD);
+    assert_eq!(s, String::from("abcd"));
+
+    let mut s = String::from("abc");
+    s.extend(Char::CapitalA..=Char::CapitalC);
+    assert_eq!(s, String::from("abcABC"));
+}

library/coretests/tests/lib.rs

@@ -27,6 +27,7 @@
 #![feature(duration_constructors)]
 #![feature(error_generic_member_access)]
 #![feature(exact_size_is_empty)]
+#![feature(extend_one)]
 #![feature(extern_types)]
 #![feature(float_minimum_maximum)]
 #![feature(flt2dec)]