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b22db3fca4
Use region-erased self type during IAT selection
Split off from #109410 as discussed.
Fixes #109299.
Re UI test: I use a reproducer of #109299 that contains a name resolution error instead of reproducer [`regionck-2.rs`](fc7ed4af16/tests/ui/associated-inherent-types/regionck-2.rs) (as found in the `AliasKind::Inherent` PR) since it would (incorrectly) pass typeck in this PR due to the lack of regionck and I'd rather not make *that* a regression test (with or without `known-bug`).
``@rustbot`` label F-inherent_associated_types
r? ``@compiler-errors``
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.