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Rollup merge of rust-lang#126285 - kpreid:unique-rc, r=dtolnay
`UniqueRc`: support allocators and `T: ?Sized`. Added the following (all unstable): * Defaulted type pararameter `A: Allocator`. * `UniqueRc::new_in()`. * `T: ?Sized` where possible. * `impl CoerceUnsized for UniqueRc`. These changes are motivated by supporting the implementation of unsized `Rc::make_mut()` (PR rust-lang#116113), but are also intended to be obvious generalizations of `UniqueRc` to support the things `Rc` does. r? `````@the8472`````
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