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Matthias Krüger
6009cb776a
Fix incorrect suggestion for undeclared hrtb lifetimes in where clauses.
For poly-trait-ref like `for<'a> Trait<T>` in `T: for<'a> Trait<T> + 'b { }`.
We should merge the hrtb lifetimes: existed `for<'a>` and suggestion `for<'b>` or will get err: [E0316] nested quantification of lifetimes
fixes #122714