Pavel Yaskevich 08baf67677 [ConstraintSystem] Fix a case of too eager force optional unwrap with optional contextual type ...

If return of optional chaining is assigned to an optional type
or discarded there should be no force optional unwrap attempt
on it because type variable associated with context can be
bound to optional of any depth.

Resolves: rdar://problem/57668873

2019-12-06 15:03:19 -08:00

340 KiB

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