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Disallow ClassVar in type aliases #19263

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brianschubert
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Reject the following case from the conformance tests:

bad12: TypeAlias = ClassVar[str]  # E: ClassVar not allowed here

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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅

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@hauntsaninja hauntsaninja left a comment

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Nice, thanks!

@hauntsaninja hauntsaninja merged commit fe91422 into python:master Jun 10, 2025
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2 participants