GeezerVison is showing github.com — [3.14] gh-155752: Do not crash when GenericAlias parameters change during substitution (GH-155761) by miss-islington · Pull Request #155771 · python/cpython
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miss-islington
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Aug 14, 2026
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An alias argument can gain typing_subst after parameters has been cached, including during a preparation or substitution callback. Check that the argument is present before indexing the substitution arguments.
(cherry picked from commit c0006fa)
Co-authored-by: Darius Houle [email protected]
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…ing substitution (pythonGH-155761)
An alias argument can gain __typing_subst__ after __parameters__ has been cached, including during a preparation or substitution callback. Check that the argument is present before indexing the substitution arguments.
(cherry picked from commit c0006fa)
Co-authored-by: Darius Houle <[email protected]>
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