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d33a5c16f2
If there was any requirements in the @objc protocol, the user got an error in
some form (a complaint about those requirements), but giving the direct error is
better, and handles @objc protocol with no requirements.
Also, fix a hole in that existing @objc method check: in `class Outer<T> { class
Inner {} }`, Inner should be considered generic, but the loop that was checking
for this didn't consider it.
Fixes https://bugs.swift.org/browse/SR-7370 and rdar://problem/39239512.