Fix edge-case Protocol bug on Python 3.7
#242
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This line is buggy. As a result of the bug, several of the assertions added in python/cpython#105835 don't pass on Python 3.7:
typing_extensions/src/typing_extensions.py
Line 743 in bc9ce4f
It should be
But we can also rewrite the condition more elegantly using the new
is_protocolfunction, so that's what I've done in this PR.