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See rust-lang/rfcs#1413.
r? @alexcrichton
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Types like `&AssertRecoverSafe<T>` and `Rc<AssertRecoverSafe<T>>` were
mistakenly not considered recover safe, but the point of the assertion wrapper
is that it indeed is! This was caused by an interaction between the
`RecoverSafe` and `NoUnsafeCell` marker traits, and this is updated by adding an
impl of the `NoUnsafeCell` marker trait for `AssertRecoverSafe` to ensure that
it never interacts with the other negative impls of `RecoverSafe`.
cc #30510
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Types like `&AssertRecoverSafe<T>` and `Rc<AssertRecoverSafe<T>>` were
mistakenly not considered recover safe, but the point of the assertion wrapper
is that it indeed is! This was caused by an interaction between the
`RecoverSafe` and `NoUnsafeCell` marker traits, and this is updated by adding an
impl of the `NoUnsafeCell` marker trait for `AssertRecoverSafe` to ensure that
it never interacts with the other negative impls of `RecoverSafe`.
cc #30510
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This commit is an implementation of [RFC 1236] and [RFC 1323] which
rename the `thread::catch_panic` function to `panic::recover` while also
replacing the `Send + 'static` bounds with a new `PanicSafe` bound.
[RFC 1236]: https://github.com/rust-lang/rfcs/pull/1236
[RFC 1323]: https://github.com/rust-lang/rfcs/pull/1323
cc #27719
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