54a8a1db60
support opaque types in method selection See my notes in https://hackmd.io/4ILASx3mQ3u_gW9r1JyqCw. This PR builds on https://github.com/rust-lang/rust/pull/145993 and allows not-yet defined opaque types as self types in the `method_autoderef_chain`. E.g. for `Box<impl Deref<impl Foo>>` this results in the autoderef chain `Box<impl Deref> -> ?deref_hidden_ty -> ?foo_hidden_ty`. Method selection stays ambiguous if the final autoderef step is still an infer var unless that var is an opaque. TODO: treating opaques as rigid jank. r? `@BoxyUwU`
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