tp_new_wrapper(): A subtle change in the check for safe use.

gvanrossum · gvanrossum · commit a8c60f478cfa · 2001-09-14T19:43:36.000Z
Allow staticbase != type, as long as their tp_new slots are the same.
diff --git a/Objects/typeobject.c b/Objects/typeobject.c
@@ -2303,7 +2303,7 @@ tp_new_wrapper(PyObject *self, PyObject *args, PyObject *kwds)
 	staticbase = subtype;
 	while (staticbase && (staticbase->tp_flags & Py_TPFLAGS_HEAPTYPE))
 		staticbase = staticbase->tp_base;
-	if (staticbase != type) {
+	if (staticbase->tp_new != type->tp_new) {
 		PyErr_Format(PyExc_TypeError,
 			     "%s.__new__(%s) is not safe, use %s.__new__()",
 			     type->tp_name,
