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[3.13] gh-140487: Fix Py_RETURN_NOTIMPLEMENTED in limited C API 3.11 (GH-140636) #140670

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Merged
merged 1 commit into from
Oct 27, 2025
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[3.13] gh-140487: Fix Py_RETURN_NOTIMPLEMENTED in limited C API 3.11 (GH-140636) #140670

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9 changes: 7 additions & 2 deletions Include/object.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1130,8 +1130,13 @@ PyAPI_DATA(PyObject) _Py_NotImplementedStruct; /* Don't use this directly */
# define Py_NotImplemented (&_Py_NotImplementedStruct)
#endif

/* Macro for returning Py_NotImplemented from a function */
#define Py_RETURN_NOTIMPLEMENTED return Py_NotImplemented
/* Macro for returning Py_NotImplemented from a function. Only treat
* Py_NotImplemented as immortal in the limited C API 3.12 and newer. */
#if defined(Py_LIMITED_API) && Py_LIMITED_API+0 < 0x030c0000
# define Py_RETURN_NOTIMPLEMENTED return Py_NewRef(Py_NotImplemented)
#else
# define Py_RETURN_NOTIMPLEMENTED return Py_NotImplemented
#endif

/* Rich comparison opcodes */
#define Py_LT 0
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/C API/2025-10-26-16-45-06.gh-issue-140487.fGOqss.rst
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@@ -0,0 +1,2 @@
Fix :c:macro:`Py_RETURN_NOTIMPLEMENTED` in limited C API 3.11 and older:
don't treat ``Py_NotImplemented`` as immortal. Patch by Victor Stinner.
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