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We allow impl lookup to use `Self` which is partially identified, but we were only allowing this for the `Self` facet appearing in the impl lookup query self. We should also allow it when `Self` appears in the impl lookup query target facet type. But demonstrate that `Self` appearing in the interface of an ImplWitnessAccess (a compound member access) is not sufficient at this time, as it does not put `Self` into the type structure.