Huon Wilson ea1560f43b [AST] Member lookup in the GSB needs to understand equivalence classes with concrete types. ...

A constraint like `Parameter == SomethingConcrete` means references to
`Parameter` in that context behave like `SomethingConcrete`, including for name
resolution. Handling the parameter as just a parameter type means that it won't
find any non-protocol nested types (i.e. things other than associated types and
protocol typealiases are invisible).

Fixes rdar://problem/42136457 and SR-8240.

2018-07-17 22:54:22 +10:00

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