Callable ClassVar is incorrectly treated as a method

[NeilGirdhar]

from typing import Callable, MutableMapping, ClassVar

class C:
    x: ClassVar[Callable[[], MutableMapping]] = dict
    def f(self) -> MutableMapping:
        return self.x()  

c = C()
print(c.f())

Gives

a.py:6: error: Attribute function "x" with type "Callable[[], MutableMapping[Any, Any]]" does not accept self argument

[sobolevn]

This is a known problem / feature. The same happens without ClassVar as well:

from typing import Callable, MutableMapping, ClassVar

class C:
    x: Callable[[], MutableMapping] = dict
    def f(self) -> MutableMapping:
        # error: Attribute function "x" with type "Callable[[], MutableMapping[Any, Any]]" does not accept self argument
        return self.x()

c = C()
print(c.f())

Related #9489

[thejcannon]

FWIW #9489 was fixed by #10548. But this appears to still be an issue

[AlexWaygood]

Closing as a duplicate of #6910 (which is not about ClassVars, but is the same but nonetheless)