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[draft] gh-116946: Emit RuntimeError if a heap type does not implement traverse #116947

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[draft] gh-116946: Emit RuntimeError if a heap type does not implement traverse #116947

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9 changes: 9 additions & 0 deletions Objects/typeobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -4709,6 +4709,15 @@ _PyType_FromMetaclass_impl(
}
}

if (!(type->tp_flags & Py_TPFLAGS_HAVE_GC)
|| type->tp_traverse == NULL)
{
if (PyErr_WarnFormat(PyExc_RuntimeError, 1,
"heap type %N should implement tp_traverse and visit their type",
type)) {
goto finally;
}
}
assert(_PyType_CheckConsistency(type));

finally:
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