Slava Pestov c365ef32c6 Sema: Handle protocol compositions containing type variables in matchTypes() ...

We would previously fail to match something like (C<$T1> & P) against
(C<Int> & P) when the constraint kind was <= Subtype, because we would
fall back to a type equality test in that case.

However, this was only valid for protocol compositions without superclass
constraints since the superclass could contain a type variable on one
side of the constraint.

Fix this by adding support for protocol composition types to
matchDeepEqualityTypes().

2019-06-17 18:40:31 -04:00

272 KiB

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