Slava Pestov 665b870f7f Sema: Fix yet another crash when accessing nested types of an existential ...

We diagnose usage of invalid existential types but we might still
try to compute substitutions. Just whip up an ErrorType instead.

Fixes <rdar://problem/16803384>.

Swift SVN r29567

2015-06-23 06:39:22 +00:00

60 KiB

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