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gh-159739: Keep generic alias arguments alive while formatting errors - #159981
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JelleZijlstra merged 1 commit intoOct 21, 2026
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JelleZijlstra merged 1 commit into
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…errors Backport to 3.15 and 3.14.
JelleZijlstra
added
needs backport to 3.14
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Thanks @jelle-openai for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14, 3.15. |
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GH-160020 is a backport of this pull request to the 3.15 branch. |
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GH-160021 is a backport of this pull request to the 3.14 branch. |
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Keep generic alias arguments alive while formatting errors. When a generic alias contains a list of parameters and an object claiming to be an unpacked type-variable tuple returns a non-tuple from
__typing_subst__, the error path frees the temporary argument tuple before reading it to format aTypeError. That use-after-free can crash the interpreter instead of reporting the invalid substitution.Backport to 3.15 and 3.14.