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Expression is of type "type[int]", not "type[int]" when using assert_type and TypeAlias #18974

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MarcoGorelli opened this issue Apr 26, 2025 · 0 comments · Fixed by #18975
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Expression is of type "type[int]", not "type[int]" when using assert_type and TypeAlias #18974

MarcoGorelli opened this issue Apr 26, 2025 · 0 comments · Fixed by #18975
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assert-type assert_type() bug mypy got something wrong topic-type-alias TypeAlias and other type alias issues

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@MarcoGorelli
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Bug Report

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

To Reproduce

https://mypy-play.net/?mypy=latest&python=3.12&gist=f8dfcc539a523e88dc63f9e6bb423d40

from typing import TypeAlias
from typing_extensions import assert_type

a: TypeAlias = int

assert_type(a, type[int])

Expected Behavior

No issues reported

Actual Behavior

g.py:6: error: Expression is of type "type[int]", not "type[int]"  [assert-type]
    assert_type(a, type[int])

Your Environment

  • Mypy version used: mypy g.py
  • Mypy command-line flags:
  • Mypy configuration options from mypy.ini (and other config files):
  • Python version used: 3.12.8
@MarcoGorelli MarcoGorelli added the bug mypy got something wrong label Apr 26, 2025
@sterliakov sterliakov added topic-type-alias TypeAlias and other type alias issues assert-type assert_type() labels Apr 26, 2025
@sterliakov sterliakov mentioned this issue Apr 26, 2025
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assert-type assert_type() bug mypy got something wrong topic-type-alias TypeAlias and other type alias issues
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Add missing branch for is_subtype(TypeType, Overload) sterliakov/mypy
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@MarcoGorelli @sterliakov