Auto merge of #117138 - zachs18:rwlock_guard_debug_unsized, r=dtolnay

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Add T: ?Sized to `RwLockReadGuard` and `RwLockWriteGuard`'s Debug impls.

For context, `MutexGuard` has `+ ?Sized` on its `Debug` impl, and all three have `+ ?Sized` on their `Display` impls.

It looks like the `?Sized` was just missed when the impls were added (the impl for `MutexGuard` was added in the same PR (https://github.com/rust-lang/rust/pull/38006) with support for `T: Debug + ?Sized`, and `RwLock*Guard`s did allow `T: ?Sized` types already); the `Display` impls were added later (https://github.com/rust-lang/rust/pull/42822) with support for `T: Debug + ?Sized` types.

I think this needs a T-libs-api FCP? I'm not sure if this also needs an ACP. If so I can make one.

These are changes to (stable) trait impls on stable types so will be insta-stable.

`@rustbot` label +T-libs-api

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bors 2023-11-18 00:59:19 +00:00

parent a13f2b6619 9be5606b26

commit bdff3846d9

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