Pavel Yaskevich 9f7d91323b [Sema] Don't allow member type lookup on existential types ...

Existential types don't support nested types so let's not
allow the lookup to make such access, with only exception
for typealias or associated types without type parameters,
they are currently allowed.

Resolves: rdar://problem/38505436

2018-03-16 13:53:09 -07:00

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