(🐞) `classmethod` on `TypedDict` leads to "AssertionError: fallback can't be filled out until semanal" with `--disallow-any-expr`

[KotlinIsland]

from typing import TypedDict

class Foo(TypedDict):
    @classmethod  # E: AssertionError: fallback can't be filled out until semanal
    def baz(cls) -> "Foo": ...

This happens due to the Any expression (no-any-expr) trying to report an error.

• related: Crash on definition of TypedDict method #5653
  playground

[KotlinIsland]

Oops, I was supposed to raise this as crash

[AlexWaygood]

To be clear, this snippet only causes mypy to crash if the --disallow-any-expr option is enabled. If the option is not enabled, everything's fine.

[KotlinIsland]

Yes, but who in their right mind would ever not have that enabled. Also it's enabled by default in basedmypy.

[AlexWaygood]

It's a legitimate crash report (and all crashes are v bad), I'm just laying out the steps needed to reproduce.

[ilevkivskyi]

On master this doesn't crash, but gives a reasonable error

test.py:4: error: Invalid statement in TypedDict definition; expected "field_name: field_type"  [misc]

[ilevkivskyi]

Oh, wait, I missed the flag.