Additional keyword args in class declaration not supported

[gvanrossum]

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.

[JukkaL]

Ah, I didn't know about that!

[JukkaL]

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

[JelleZijlstra]

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