Account for return-position impl Trait
in trait in opt_suggest_box_span
#105846
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RPITITs are the only types where their opaque bounds might normalize to some other self type than the opaque type itself. To avoid needing to do normalization, let's just match on either alias kind.
Ideally, we'd just get rid of
opt_suggest_box_span
. It's kind of a wart on type-checkingif
/match
. I've recently refactored this expression for being confusing/wrong, but moving it into the error path is pretty hard.Fixes #105838