NotImplemented is not callable

I understand the points raised here python/mypy#6710

However the current issue is that

raise NotImplemented()

seems perfectly valid to mypy when in fact it isn't, since it's not callable.

So basically, it should have been a NotImplementedError but mypy didn't find it (I found it with pyflakes).

Do you think it is possible to make it an almost-but-non-callable-Any?

Otherwise it could perhaps be mypy to warn about odd uses?

~~We could try to make NotImplemented a sub-class of Any and override __call__():~~

~~from typing import Any class NotImplemented(Any): __call__: None def bar() -> str: return NotImplemented() x: NotImplemented x()~~

~~Not very elegant and the error message is not correct, but maybe better than nothing?~~

Typo in bar(). Does not work.

builtins: NotImplemented is not callable

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