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Title: Result is not checked in `BINARY_OP_EXTEND` · Issue #144012 · python/cpython · GitHub

Open Graph Title: Result is not checked in `BINARY_OP_EXTEND` · Issue #144012 · python/cpython

X Title: Result is not checked in `BINARY_OP_EXTEND` · Issue #144012 · python/cpython

Description: Bug report Bug description: Code: cpython/Python/bytecodes.c Line 840 in 63cc125 PyObject *res_o = d->action(left_o, right_o); Previous discussion: https://github.com/python/cpython/pull/144006/changes/acd784a95851fc0c63c1c2f718420a43d6f...

Open Graph Description: Bug report Bug description: Code: cpython/Python/bytecodes.c Line 840 in 63cc125 PyObject *res_o = d->action(left_o, right_o); Previous discussion: https://github.com/python/cpython/pull/144006/cha...

X Description: Bug report Bug description: Code: cpython/Python/bytecodes.c Line 840 in 63cc125 PyObject *res_o = d->action(left_o, right_o); Previous discussion: https://github.com/python/cpython/pull/144006/...

Opengraph URL: https://github.com/python/cpython/issues/144012

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og:image:altBug report Bug description: Code: cpython/Python/bytecodes.c Line 840 in 63cc125 PyObject *res_o = d->action(left_o, right_o); Previous discussion: https://github.com/python/cpython/pull/144006/cha...
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Result is not checked in BINARY_OP_EXTENDhttps://patch-diff.githubusercontent.com/python/cpython/issues/144012#top
interpreter-core(Objects, Python, Grammar, and Parser dirs)https://github.com/python/cpython/issues?q=state%3Aopen%20label%3A%22interpreter-core%22
type-bugAn unexpected behavior, bug, or errorhttps://github.com/python/cpython/issues?q=state%3Aopen%20label%3A%22type-bug%22
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on Jan 18, 2026https://github.com/python/cpython/issues/144012#issue-3827050489
cpython/Python/bytecodes.chttps://github.com/python/cpython/blob/63cc1257db468a368d64c0b968d203a0f4c7303a/Python/bytecodes.c#L840
63cc125https://patch-diff.githubusercontent.com/python/cpython/commit/63cc1257db468a368d64c0b968d203a0f4c7303a
https://github.com/python/cpython/pull/144006/changes/acd784a95851fc0c63c1c2f718420a43d6fc6d4a..8e1bcaa84cbdd4ac446b11453ddedadb34ef11f2#r2702550535https://github.com/python/cpython/pull/144006/changes/acd784a95851fc0c63c1c2f718420a43d6fc6d4a..8e1bcaa84cbdd4ac446b11453ddedadb34ef11f2#r2702550535
gh-144012: Check null binary op extend #144014https://github.com/python/cpython/pull/144014
[3.14] gh-144012: Check null binary op extend (GH-144014) #144038https://github.com/python/cpython/pull/144038
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