Rintaro Ishizaki bccfd85b70 [CodeComplete] Typecheck SubscriptDecl context prior to completion ...

Completing signature depends on its GenericEnvironment which is set
during typechecking. Previously, completing signature using generic type
used to cause assertion failure. e.g.

  extension Collection {
    subscript(some index: Int) -> Iterator.<COMPLETE HERE>

rdar://problem/41227754

2018-06-28 17:39:07 +09:00

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