Rollup of 6 pull requests

Cargo.lock

@@ -5263,9 +5263,9 @@ dependencies = [
 
 [[package]]
 name = "stringdex"
-version = "0.0.1-alpha10"
+version = "0.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0fa846a7d509d1828a4f90962dc09810e161abcada7fc6a921e92c168d0811d7"
+checksum = "18b3bd4f10d15ef859c40291769f0d85209de6b0f1c30713ff9cdf45ac43ea36"
 dependencies = [
  "stacker",
 ]

compiler/rustc_codegen_ssa/src/mir/locals.rs

@@ -40,12 +40,12 @@ impl<'tcx, V> Locals<'tcx, V> {
 impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
     pub(super) fn initialize_locals(&mut self, values: Vec<LocalRef<'tcx, Bx::Value>>) {
         assert!(self.locals.values.is_empty());
+        self.locals.values = IndexVec::from_raw(values);
         // FIXME(#115215): After #115025 get's merged this might not be necessary
-        for (local, value) in values.into_iter().enumerate() {
+        for (local, value) in self.locals.values.iter_enumerated() {
             match value {
                 LocalRef::Place(_) | LocalRef::UnsizedPlace(_) | LocalRef::PendingOperand => (),
                 LocalRef::Operand(op) => {
-                    let local = mir::Local::from_usize(local);
                     let expected_ty = self.monomorphize(self.mir.local_decls[local].ty);
                     if expected_ty != op.layout.ty {
                         warn!(
@@ -56,7 +56,6 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
                     }
                 }
             }
-            self.locals.values.push(value);
         }
     }
 

compiler/rustc_const_eval/src/check_consts/qualifs.rs

@@ -234,7 +234,7 @@ where
 
         Rvalue::Discriminant(place) => in_place::<Q, _>(cx, in_local, place.as_ref()),
 
-        Rvalue::CopyForDeref(_) => bug!("`CopyForDeref` in runtime MIR"),
+        Rvalue::CopyForDeref(place) => in_place::<Q, _>(cx, in_local, place.as_ref()),
 
         Rvalue::Use(operand)
         | Rvalue::Repeat(operand, _)

compiler/rustc_sanitizers/src/cfi/typeid/itanium_cxx_abi/transform.rs

@@ -10,8 +10,8 @@ use rustc_hir as hir;
 use rustc_hir::LangItem;
 use rustc_middle::bug;
 use rustc_middle::ty::{
-    self, ExistentialPredicateStableCmpExt as _, Instance, InstanceKind, IntTy, List, TraitRef, Ty,
-    TyCtxt, TypeFoldable, TypeFolder, TypeSuperFoldable, TypeVisitableExt, UintTy,
+    self, ExistentialPredicateStableCmpExt as _, Instance, IntTy, List, TraitRef, Ty, TyCtxt,
+    TypeFoldable, TypeFolder, TypeSuperFoldable, TypeVisitableExt, UintTy,
 };
 use rustc_span::def_id::DefId;
 use rustc_span::{DUMMY_SP, sym};
@@ -458,6 +458,30 @@ pub(crate) fn transform_instance<'tcx>(
     instance
 }
 
+fn default_or_shim<'tcx>(tcx: TyCtxt<'tcx>, instance: Instance<'tcx>) -> Option<DefId> {
+    match instance.def {
+        ty::InstanceKind::Item(def_id) | ty::InstanceKind::FnPtrShim(def_id, _) => {
+            tcx.opt_associated_item(def_id).map(|item| item.def_id)
+        }
+        _ => None,
+    }
+}
+
+/// Determines if an instance represents a trait method implementation and returns the necessary
+/// information for type erasure.
+///
+/// This function handles two main cases:
+///
+/// * **Implementation in an `impl` block**: When the instance represents a concrete implementation
+///   of a trait method in an `impl` block, it extracts the trait reference, method ID, and trait
+///   ID from the implementation. The method ID is obtained from the `trait_item_def_id` field of
+///   the associated item, which points to the original trait method definition.
+///
+/// * **Provided method in a `trait` block or synthetic `shim`**: When the instance represents a
+///   default implementation provided in the trait definition itself or a synthetic shim, it uses
+///   the instance's own `def_id` as the method ID and determines the trait ID from the associated
+///   item.
+///
 fn implemented_method<'tcx>(
     tcx: TyCtxt<'tcx>,
     instance: Instance<'tcx>,
@@ -473,11 +497,9 @@ fn implemented_method<'tcx>(
         trait_method = tcx.associated_item(method_id);
         trait_id = trait_ref.skip_binder().def_id;
         impl_id
-    } else if let InstanceKind::Item(def_id) = instance.def
-        && let Some(trait_method_bound) = tcx.opt_associated_item(def_id)
-    {
-        // Provided method in a `trait` block
-        trait_method = trait_method_bound;
+    } else if let Some(trait_method_def_id) = default_or_shim(tcx, instance) {
+        // Provided method in a `trait` block or a synthetic `shim`
+        trait_method = tcx.associated_item(trait_method_def_id);
         method_id = instance.def_id();
         trait_id = tcx.trait_of_assoc(method_id)?;
         trait_ref = ty::EarlyBinder::bind(TraitRef::from_assoc(tcx, trait_id, instance.args));

library/std/src/fs.rs

@@ -387,6 +387,87 @@ pub fn write<P: AsRef<Path>, C: AsRef<[u8]>>(path: P, contents: C) -> io::Result
     inner(path.as_ref(), contents.as_ref())
 }
 
+/// Changes the timestamps of the file or directory at the specified path.
+///
+/// This function will attempt to set the access and modification times
+/// to the times specified. If the path refers to a symbolic link, this function
+/// will follow the link and change the timestamps of the target file.
+///
+/// # Platform-specific behavior
+///
+/// This function currently corresponds to the `utimensat` function on Unix platforms, the
+/// `setattrlist` function on Apple platforms, and the `SetFileTime` function on Windows.
+///
+/// # Errors
+///
+/// This function will return an error if the user lacks permission to change timestamps on the
+/// target file or symlink. It may also return an error if the OS does not support it.
+///
+/// # Examples
+///
+/// ```no_run
+/// #![feature(fs_set_times)]
+/// use std::fs::{self, FileTimes};
+/// use std::time::SystemTime;
+///
+/// fn main() -> std::io::Result<()> {
+///     let now = SystemTime::now();
+///     let times = FileTimes::new()
+///         .set_accessed(now)
+///         .set_modified(now);
+///     fs::set_times("foo.txt", times)?;
+///     Ok(())
+/// }
+/// ```
+#[unstable(feature = "fs_set_times", issue = "147455")]
+#[doc(alias = "utimens")]
+#[doc(alias = "utimes")]
+#[doc(alias = "utime")]
+pub fn set_times<P: AsRef<Path>>(path: P, times: FileTimes) -> io::Result<()> {
+    fs_imp::set_times(path.as_ref(), times.0)
+}
+
+/// Changes the timestamps of the file or symlink at the specified path.
+///
+/// This function will attempt to set the access and modification times
+/// to the times specified. Differ from `set_times`, if the path refers to a symbolic link,
+/// this function will change the timestamps of the symlink itself, not the target file.
+///
+/// # Platform-specific behavior
+///
+/// This function currently corresponds to the `utimensat` function with `AT_SYMLINK_NOFOLLOW` on
+/// Unix platforms, the `setattrlist` function with `FSOPT_NOFOLLOW` on Apple platforms, and the
+/// `SetFileTime` function on Windows.
+///
+/// # Errors
+///
+/// This function will return an error if the user lacks permission to change timestamps on the
+/// target file or symlink. It may also return an error if the OS does not support it.
+///
+/// # Examples
+///
+/// ```no_run
+/// #![feature(fs_set_times)]
+/// use std::fs::{self, FileTimes};
+/// use std::time::SystemTime;
+///
+/// fn main() -> std::io::Result<()> {
+///     let now = SystemTime::now();
+///     let times = FileTimes::new()
+///         .set_accessed(now)
+///         .set_modified(now);
+///     fs::set_times_nofollow("symlink.txt", times)?;
+///     Ok(())
+/// }
+/// ```
+#[unstable(feature = "fs_set_times", issue = "147455")]
+#[doc(alias = "utimensat")]
+#[doc(alias = "lutimens")]
+#[doc(alias = "lutimes")]
+pub fn set_times_nofollow<P: AsRef<Path>>(path: P, times: FileTimes) -> io::Result<()> {
+    fs_imp::set_times_nofollow(path.as_ref(), times.0)
+}
+
 #[stable(feature = "file_lock", since = "1.89.0")]
 impl error::Error for TryLockError {}