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Rollup merge of #120899 - compiler-errors:non-wf-alias, r=lcnr
Gracefully handle non-WF alias in `assemble_alias_bound_candidates_recur`
See explanation in test. I think it's fine to delay a bug here -- I don't believe we ever construct a non-wf alias on the good path? If so, then we can just remove the delay.
Fixes #120891
r? lcnr
