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Auto merge of #117088 - lcnr:generalize-alias, r=compiler-errors
generalize: handle occurs check failure in aliases
mostly fixes #105787, except for the `for<'a> fn(<<?x as OtherTrait>::Assoc as Trait<'a>>::Assoc) eq ?x` case in https://github.com/rust-lang/trait-system-refactor-initiative/issues/8.
r? `@compiler-errors`
