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gh-159739: [typing] Handle generic alias construction errors by jelle-openai · Pull Request #159772 · python/cpython · GitHub

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gh-159739: [typing] Handle generic alias construction errors - #159772

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JelleZijlstra merged 1 commit into
python:mainfrom
jelle-openai:jelle/codex/gh-159739-generic-alias-errors
Oct 20, 2026
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gh-159739: [typing] Handle generic alias construction errors#159772
JelleZijlstra merged 1 commit into
python:mainfrom
jelle-openai:jelle/codex/gh-159739-generic-alias-errors

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jelle-openai commented Oct 19, 2026 •
edited by bedevere-app Bot
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pythongh-159739: Handle generic alias construction errors
3304449 
Backport to 3.15 and 3.14 (Objects/typevarobject.c only on 3.14).
bedevere-app Bot mentioned this pull request Oct 19, 2026
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JelleZijlstra added needs backport to 3.14 bugs and security fixes needs backport to 3.15 bugs and security fixes labels Oct 19, 2026
JelleZijlstra enabled auto-merge (squash) October 20, 2026 17:19
JelleZijlstra merged commit 07df106 into python:main Oct 20, 2026
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miss-islington-app Bot commented Oct 20, 2026

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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.
🐍🍒⛏🤖

miss-islington-app Bot commented Oct 20, 2026

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Sorry, @jelle-openai and @JelleZijlstra, I could not cleanly backport this to 3.14 due to a conflict.

Please backport manually with cherry_picker, see the devguide for more information.

cherry_picker 07df106f7efa7e5e3f5fba4b4927eaba5bcd98d0 3.14

bedevere-app Bot commented Oct 20, 2026

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GH-159909 is a backport of this pull request to the 3.15 branch.

bedevere-app Bot removed the needs backport to 3.15 bugs and security fixes label Oct 20, 2026
jelle-openai mentioned this pull request Oct 20, 2026
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bedevere-app Bot commented Oct 20, 2026

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GH-159929 is a backport of this pull request to the 3.14 branch.

bedevere-app Bot removed the needs backport to 3.14 bugs and security fixes label Oct 20, 2026
JelleZijlstra added a commit that referenced this pull request Oct 20, 2026
[3.15] gh-159739: [typing] Handle generic alias construction errors (G…
429ed98 
…H-159772) (#159909)

(cherry picked from commit 07df106)

Co-authored-by: Jelle Zijlstra <jelle@openai.com>
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
JelleZijlstra pushed a commit that referenced this pull request Oct 20, 2026
[3.14] gh-159739: [typing] Handle generic alias construction errors (G…
7615f71 
…H-159772) (#159929)

Backport the typevarobject.c fix; Python 3.14 does not decref subargs on the generic-alias substitution error path.

(cherry picked from commit 07df106)
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