Doug Gregor 4cadee421b Handle nested generic extensions in TypeBase::gatherAllSubstitutions(). ...

The code in TypeBase::gatherAllSubstitutions() walks a declaration
context and type to form a complete set of substitutions for a
(nested) type. When provided with a context for a nested
extension---e.g., "extension OuterGeneric.InnerGeneric", it would skip
over OuterGeneric due to the lexical nesting of DeclContexts not
matching the semantic nesting.

Teach this function to determine the type parameters without walking DeclContexts.

2016-11-06 01:48:26 -08:00

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