Additional keyword args in class declaration not supported

In Python 3 you can have arbitrary keyword args in a class declaration, as follows:

class C(metaclass=MyMeta, extra=42):
    ...

Here, mypy reports a syntax error at the comma.

Ah, I didn't know about that!

Bumping priority since I want to work towards full Python 3 syntax support.

This is fixed; there are tests in test-data/unit/parse.test that do class Foo(metaclass=Bar, _root=None): pass.

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