Bug report (Regression): bad overload resolution in `--strict` mode

[thierry-martinez]

Bug Report

The following code type-checked with mypy 1.16.1 in --strict mode but does not type-check with mypy 1.17 and the master branch (currently eb07c06) in --strict mode. Bisecting points to the commit 33d1eed.

Note that the problem does not occur if --strict mode is disabled.

To Reproduce

import inspect
import typing
from typing import Any, ClassVar

def is_classvar(cls: type, scope: dict[Any, type]) -> bool:
    ann = inspect.get_annotations(cls, eval_str=True, locals=scope).get("kind")
    if ann is None:
        raise Exception("Should be annotated.")
    return typing.get_origin(ann) is not ClassVar

Actual Behavior

mypy --strict test_any.py
test_any.py:9: error: Non-overlapping identity check (left operand type: "ParamSpec", right operand type: "<typing special form>")  [comparison-overlap]
Found 1 error in 1 file (checked 1 source file)

Your Environment

• Mypy version used: mypy 1.17 and master (bad), mypy 1.16.1 (good)
• Mypy command-line flags: --strict
• Mypy configuration options from mypy.ini (and other config files):
• Python version used: 3.13

Note that reveal_type(ann) gives Any | None and that annotating ann: Any | None solves the problem.