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e664cb2154
Allow codegen to unsize `dyn*` to `dyn` `dyn* Trait` is just another type that implements `Trait`, so we should be able to unsize `&dyn* Trait` into `&dyn Trait` perfectly fine, same for `Box` and other unsizeable types. Fixes #106488
Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.