Missing undefined-variable for metaclass custom keyword argument

[douglas-raillard-arm]

Hello, here is an "interesting" corner case, derived from the one I posted to exhibit #1630

Since I'm not sure if that is sharing the same root cause, I opened a separate ticket.

Steps to reproduce

class Meta(type):
    def __new__(cls, name, bases, dct, *args, x=None, **kwargs):
        print(x)
        return super().__new__(cls, name, bases, dct, *args, **kwargs)

class C(metaclass=Meta, x=var):
    pass

Current behavior

Not reporting any error.

Expected behavior

test.py:6:6: E0602: Undefined variable 'var' (undefined-variable)

pylint --version output

pylint 2.6.0
astroid 2.4.2
Python 3.8.7 (default, Dec 24 2020, 17:53:09) 
[GCC 10.2.0]

[PCManticore]

Thanks, this makes sense.