7d145ebffa
`UniqueRc` trait impls UniqueRc tracking Issue: #112566 Stable traits: (i.e. impls behind only the `unique_rc_arc` feature gate) * Support the same formatting as `Rc`: * `fmt::Debug` and `fmt::Display` delegate to the pointee. * `fmt::Pointer` prints the address of the pointee. * Add explicit `!Send` and `!Sync` impls, to mirror `Rc`. * Borrowing traits: `Borrow`, `BorrowMut`, `AsRef`, `AsMut` * `Rc` does not implement `BorrowMut` and `AsMut`, but `UniqueRc` can. * Unconditional `Unpin`, like other heap-allocated types. * Comparison traits `(Partial)Ord` and `(Partial)Eq` delegate to the pointees. * `PartialEq for UniqueRc` does not do `Rc`'s specialization shortcut for pointer equality when `T: Eq`, since by definition two `UniqueRc`s cannot share an allocation. * `Hash` delegates to the pointee. * `AsRawFd`, `AsFd`, `AsHandle`, `AsSocket` delegate to the pointee like `Rc`. * Sidenote: The bounds on `T` for the existing `Pointer<T>` impls for specifically `AsRawFd` and `AsSocket` do not allow `T: ?Sized`. For the added `UniqueRc` impls I allowed `T: ?Sized` for all four traits, but I did not change the existing (stable) impls. Unstable traits: * `DispatchFromDyn`, allows using `UniqueRc<Self>` as a method receiver under `feature(arbitrary_self_types)`. * Existing `PinCoerceUnsized for UniqueRc` is generalized to allow non-`Global` allocators, like `Rc`. * `DerefPure`, allows using `UniqueRc` in deref-patterns under `feature(deref_patterns)`, like `Rc`. For documentation, `Rc` only has documentation on the comparison traits' methods, so I copied/adapted the documentation for those, and left the rest without impl-specific docs. ~~Edit: Marked as draft while I figure out `UnwindSafe`.~~ Edit: Ignoring `UnwindSafe` for this PR
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