AssertionError in deeply nested class scenario (incremental with warm cache)

[ilevkivskyi]

This is a small remainder of #2535

Example to reproduce: run mypy -i main.py twice (without touching any files in between) where:

• main.py

import ntcrash

• ntcrash.py

from typing import NamedTuple

class C:
    def f(self) -> None:
        class D:
            class E:
                def g(self) -> None:
                    A = NamedTuple('A', [('x', int), ('y', int)])
                    self.a = A(1, 1)
        self.c = D.E().a

Possible fix would be to store all "anonymous" classes in globals.

[ilevkivskyi]

One needs to add reveal_type(ntcrash.C().c) between two runs to trigger the crash.

[hauntsaninja]

I think this is fixed on master, possibly by #10431