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69ebffbace
We have a special hack to infer the 'Failure' type witness in
'AsyncIteratorProtocol' by considering the type of 'next()'
witness.
In eaf06eae0e I added a check to
fix some assertions that could happen if 'next()' was witnessed
by a declaration in a protocol extension or superclass, which
has a different generic signature.
However my check was too narrow, because it also prohibited
this form of inference when 'next()' was in a different
extension of the same nominal type.
Allow this again.
Fixes https://github.com/swiftlang/swift/issues/79367.
Fixes rdar://problem/145341658.