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Allow `*const W<dyn A> -> *const dyn A` ptr cast Followup of https://github.com/rust-lang/rust/pull/120248#discussion_r1487936000. This PR allows casting pointers from something wrapping a trait object, to the trait object, i.e. `*const W<dyn A> -> *const dyn A` where `W` is `struct W<T: ?Sized>(T);`. r? compiler-errors Fixes https://github.com/rust-lang/rust/issues/128625