[Type checker] Tolerate missing generic environments better. #14567
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Before matching witnesses, ensure that we have a valid signature, and be more tolerant of null generic environments by using the mapTypeIntoContext entry point meant to handle null. We haven't managed to get a decent reproducer for this, but it's happening often enough, and this change hardens the affected code paths. Should fix rdar://problem/37255982.
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@swift-ci please smoke test and merge |
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@swift-ci please smoke test Linux |
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Before matching witnesses, ensure that we have a valid signature, and be
more tolerant of null generic environments by using the
mapTypeIntoContext entry point meant to handle null.
We haven't managed to get a decent reproducer for this, but it's
happening often enough, and this change hardens the affected code
paths.
Should fix rdar://problem/37255982.