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Tighten allocator Send/Sync requirements for Arc in preparation for refactor #161429

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Merged
rust-bors merged 1 commit into from
Aug 21, 2026
Merged

Tighten allocator Send/Sync requirements for Arc in preparation for refactor #161429

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5 changes: 1 addition & 4 deletions library/alloc/src/rc.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -344,10 +344,7 @@ impl<T: ?Sized, A: Allocator> !Sync for Rc<T, A> {}
#[stable(feature = "catch_unwind", since = "1.9.0")]
impl<T: RefUnwindSafe + ?Sized, A: Allocator + UnwindSafe + RefUnwindSafe> UnwindSafe for Rc<T, A> {}
#[stable(feature = "rc_ref_unwind_safe", since = "1.58.0")]
impl<T: RefUnwindSafe + ?Sized, A: Allocator + UnwindSafe + RefUnwindSafe> RefUnwindSafe
for Rc<T, A>
{
}
impl<T: RefUnwindSafe + ?Sized, A: Allocator + RefUnwindSafe> RefUnwindSafe for Rc<T, A> {}

#[unstable(feature = "coerce_unsized", issue = "18598")]
impl<T: ?Sized + Unsize<U>, U: ?Sized, A: Allocator> CoerceUnsized<Rc<U, A>> for Rc<T, A> {}
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6 changes: 3 additions & 3 deletions library/alloc/src/sync.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -283,7 +283,7 @@ pub struct Arc<
#[stable(feature = "rust1", since = "1.0.0")]
unsafe impl<T: ?Sized + Sync + Send, A: Allocator + Send + Sync> Send for Arc<T, A> {}
#[stable(feature = "rust1", since = "1.0.0")]
unsafe impl<T: ?Sized + Sync + Send, A: Allocator + Sync> Sync for Arc<T, A> {}
unsafe impl<T: ?Sized + Sync + Send, A: Allocator + Send + Sync> Sync for Arc<T, A> {}

#[stable(feature = "catch_unwind", since = "1.9.0")]
impl<T: RefUnwindSafe + ?Sized, A: Allocator + UnwindSafe + RefUnwindSafe> UnwindSafe
Expand Down Expand Up @@ -369,7 +369,7 @@ pub struct Weak<
#[stable(feature = "arc_weak", since = "1.4.0")]
unsafe impl<T: ?Sized + Sync + Send, A: Allocator + Send + Sync> Send for Weak<T, A> {}
#[stable(feature = "arc_weak", since = "1.4.0")]
unsafe impl<T: ?Sized + Sync + Send, A: Allocator + Sync> Sync for Weak<T, A> {}
unsafe impl<T: ?Sized + Sync + Send, A: Allocator + Send + Sync> Sync for Weak<T, A> {}

#[unstable(feature = "coerce_unsized", issue = "18598")]
impl<T: ?Sized + Unsize<U>, U: ?Sized, A: Allocator> CoerceUnsized<Weak<U, A>> for Weak<T, A> {}
Expand Down Expand Up @@ -4429,7 +4429,7 @@ pub struct UniqueArc<
unsafe impl<T: ?Sized + Sync + Send, A: Allocator + Send + Sync> Send for UniqueArc<T, A> {}

#[unstable(feature = "unique_rc_arc", issue = "112566")]
unsafe impl<T: ?Sized + Sync + Send, A: Allocator + Sync> Sync for UniqueArc<T, A> {}
unsafe impl<T: ?Sized + Sync + Send, A: Allocator + Send + Sync> Sync for UniqueArc<T, A> {}

#[unstable(feature = "unique_rc_arc", issue = "112566")]
// #[unstable(feature = "coerce_unsized", issue = "18598")]
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