With `--disallow-any-decorated`, `Any` detection logic changes w/wo decorator

Commencez par exécuter le cas de test testDisallowAnyDecoratedShouldNeverAffect avec --disallow-any-decorated et le fixture builtins fixtures/classmethod.pyi fourni. Comparez les cas non décoré, classmethod et décorateur personnalisé, puis rendez le comportement cohérent et couvrez la condition d’erreur choisie avec des tests de régression.

Bug Report

(A clear and concise description of what the bug is.)

We expect that adding a decorator to a method will never produce a new mypy error unless the decorator itself introduces a new Any annotation, i.e. expect no new error if the decorator itself does not introduce any additional Any.

We also believe that it is difficult to call this behavior a bug. The behavior of the option itself seems self-evident in its own way.

But we would expect a situation where simply applying a harmless decorator would not change the presence or absence of errors.

To Reproduce

Here is a test case.

[case testDisallowAnyDecoratedShouldNeverAffect]
# flags: --disallow-any-decorated

import dataclasses
from typing import Any, Callable

from typing_extensions import TypedDict, TypeVar

class CtxAny(TypedDict):
    place: Any

CallableT = TypeVar("CallableT")

def custom_decorator(func: CallableT) -> CallableT:
    return func

class Something:
    # No error
    def do(self, ctx: CtxAny) -> None:
        pass

    @classmethod
    # This emits an error, unexpected.
    def do_classmethod(cls, ctx: CtxAny) -> None:  # E: Type of decorated function contains type "Any" ("Callable[[Type[Something], CtxAny], None]")
        pass

    @custom_decorator
    # This emits an error, unexpected.
    def do_custom_decorator(self, ctx: CtxAny) -> None:  # E: Type of decorated function contains type "Any" ("Callable[[Something, CtxAny], None]")
        pass
[builtins fixtures/classmethod.pyi]

Expected Behavior

We expect do and others to be the same error-condition.

i.e. one of:

• No mypy errors emitted.
• All (containing do method) emits an error.
  • If some option allows us to emit an error on do method, it will be fine.

Actual Behavior

As shown in reproduction code.

Your Environment

• Mypy version used:current master
• Mypy command-line flags:--disallow-any-decorated
• Mypy configuration options from mypy.ini (and other config files):
• Python version used: 3.8.16, 3.11.3