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Rollup merge of #129673 - matthewpipie:arc-weak-debug-trait, r=dtolnay

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Add fmt::Debug to sync::Weak<T, A>

Currently, `sync::Weak<T>` implements `Debug`, but `sync::Weak<T, A>` does not. This appears to be an oversight, as `rc::Weak<T, A>` implements `Debug`. (Note: `sync::Weak` is the weak for `Arc`, and `rc::Weak` is the weak for `Rc`.)

This PR adds the Debug trait for `sync::Weak<T, A>`. The issue was initially brought up here: https://github.com/rust-lang/wg-allocators/issues/131
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Jubilee 2024-08-28 19:12:54 -07:00 committed by GitHub
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library/alloc/src/sync.rs
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@ -335,7 +335,7 @@ impl<T: ?Sized + Unsize<U>, U: ?Sized, A: Allocator> CoerceUnsized<Weak<U, A>> f
impl<T: ?Sized + Unsize<U>, U: ?Sized> DispatchFromDyn<Weak<U>> for Weak<T> {} impl<T: ?Sized + Unsize<U>, U: ?Sized> DispatchFromDyn<Weak<U>> for Weak<T> {}
#[stable(feature = "arc_weak", since = "1.4.0")] #[stable(feature = "arc_weak", since = "1.4.0")]
impl<T: ?Sized> fmt::Debug for Weak<T> { impl<T: ?Sized, A: Allocator> fmt::Debug for Weak<T, A> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "(Weak)") write!(f, "(Weak)")
} }