Issue #22079: Deprecation warning now is issued in PyType_Ready() instead of

raising TypeError when statically allocated type subclasses dynamically
allocated type

Objects/typeobject.c

@@ -4803,11 +4803,14 @@ PyType_Ready(PyTypeObject *type)
             PyObject *b = PyTuple_GET_ITEM(bases, i);
             if (PyType_Check(b) &&
                 (((PyTypeObject *)b)->tp_flags & Py_TPFLAGS_HEAPTYPE)) {
-                PyErr_Format(PyExc_TypeError,
+                char buf[300];
+                PyOS_snprintf(buf, sizeof(buf),
                               "type '%.100s' is not dynamically allocated but "
                               "its base type '%.100s' is dynamically allocated",
                               type->tp_name, ((PyTypeObject *)b)->tp_name);
+                if (PyErr_Warn(PyExc_DeprecationWarning, buf) < 0)
                     goto error;
+                break;
             }
         }