0938e1680d
Support default-body trait functions with return-position `impl Trait` in traits Introduce a new `Trait` candidate kind for the `ImplTraitInTrait` projection candidate, which just projects an RPITIT down to its opaque type form. This is a hack until we lower RPITITs to regular associated types, after which we will need to rework how these default bodies are type-checked, so comments are left in a few places for us to clean up later. Fixes #101665
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- The test suite
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For more information on how various parts of the compiler work, see the rustc dev guide.