Slava Pestov 45ef0f5dfb Sema: Generic types cannot witness associated type requirements ...

Until recently we didn't allow nested generic types at all.
In Swift 3, generic typealiases were added, and we forgot to
guard against them in witness matching, leading to a crash if
a generic typealias witnesses an associated type requirement.

Now that nested generic nominals are allowed too, add a check.

The diagnostic is not very good, but I'll revisit this later.

2016-12-18 22:34:16 -08:00

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