bors 1d67eba687 Auto merge of #112891 - oli-obk:impl_trait_in_assoc_tys_cleanup, r=compiler-errors
Various impl trait in assoc tys cleanups

r? `@compiler-errors`

All commits except for the last are pure refactorings. 274dab5bd658c97886a8987340bf50ae57900c39 allows struct fields to participate in deciding whether a function has an opaque in its signature.

best reviewed commit by commit
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