Slava Pestov fc21ecce68 AST: Don't return hasTypeParameter() for DependentMemberTypes with an ErrorType base ...

Instead, introduce a new hasDependentMember() recursive property.

The only place that cares about this is associated type inference,
where I changed all existing hasTypeParameter() checks to instead
check (hasTypeParameter() || hasDependentMember()). We could
probably refine this over time and remove some of the
hasTypeParameter() checks, but I'm being conservative for now.

Fixes <https://bugs.swift.org/browse/SR-4575> and
<rdar://problem/31603113>.

2017-05-26 18:10:13 -07:00

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