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Auto merge of #87467 - inquisitivecrystal:ref-unwind, r=dtolnay

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Implement `RefUnwindSafe` for `Rc<T>`

This PR implements `RefUnwindSafe` for `Rc<T>`, where `T: RefUnwindSafe`.

This impl was omitted by an apparent oversight. `Rc<T>` already implements `UnwindSafe`. `Arc<T>` implements both `UnwindSafe` and `RefUnwindSafe`. There is no reason why an `&Rc<T>` is any less unwind safe than a `Rc<T>` or an `&Arc<T>`, so this should be safe to add.

Resolves #45924.
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bors 2021-11-04 06:54:21 +00:00
commit 4061c04079
1 changed files with 2 additions and 0 deletions
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library/alloc/src/rc.rs
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@ -318,6 +318,8 @@ impl<T: ?Sized> !marker::Sync for Rc<T> {}
#[stable(feature = "catch_unwind", since = "1.9.0")]
impl<T: RefUnwindSafe + ?Sized> UnwindSafe for Rc<T> {}
#[stable(feature = "rc_ref_unwind_safe", since = "1.58.0")]
impl<T: RefUnwindSafe + ?Sized> RefUnwindSafe for Rc<T> {}
#[unstable(feature = "coerce_unsized", issue = "27732")]
impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<Rc<U>> for Rc<T> {}