Doug Gregor 293e31658c Prefer witnesses with no difference effects to ones that have fewer effects. ...

One can overload on async vs. non-async, and the constraint solver has a
preference rule based on context. Extend that preference rule to
witness matching, so we prefer a witness that exactly matches the
effects of the requirement to one that has fewer effects.

Fixes rdar://84034057.

2021-11-08 16:36:39 -08:00

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