Slava Pestov fbd1f1acbd Sema: Fix a couple of problems in checkContextualRequirements() ...

The original bug was a crash-on-invalid with a missing '}', but it
actually exposed a bug with nested protocols (SE-0404) and another
long-time bug.

- Whatever we do, we should skip this for protocols because their 'Self'
  parameter is not bound from context.

- getTrailingWhereClause() is not the right proxy for "has a generic
  signature different than its parent", in particular it doesn't
  round-trip through serialization. Instead, just compare generic
  signatures for pointer equality in the early return check.

The second change is source-breaking because it was possible to
write a nested type with a `where` clause and use it contradicting
its requirements across a module boundary.

Fixes rdar://113103854.

2023-08-08 15:06:08 -04:00

4.2 KiB

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