Don't ICE if HIR and middle types disagree in borrowck error reporting #128172
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We try to match up the
middle::ty::Ty
andhir::Ty
types in borrowck error reporting, but due to things likeSelf
self type alias, or regular type aliases, these might not match up. Don't ICE.This PR also tries to recover the error by looking up the self type of the impl in case we see
Self
. The diagnostic is frankly quite confusing, but I also didn't really want to look at it because I don't understand the conflict error reporting logic. 🤷Fixes #121816