Recompute the special getattr/setattr/delattr cache slots after

changing __dict__ *or* __bases__.

Objects/classobject.c

@@ -227,21 +227,26 @@ set_slot(slot, v)
 	Py_XDECREF(temp);
 }
 
-static char *
-set_dict(c, v)
+static void
+set_attr_slots(c)
 	PyClassObject *c;
-	PyObject *v;
 {
 	PyClassObject *dummy;
 
-	if (v == NULL || !PyDict_Check(v))
-		return "__dict__ must be a dictionary object";
-	set_slot(&c->cl_dict, v);
-
 	set_slot(&c->cl_getattr, class_lookup(c, getattrstr, &dummy));
 	set_slot(&c->cl_setattr, class_lookup(c, setattrstr, &dummy));
 	set_slot(&c->cl_delattr, class_lookup(c, delattrstr, &dummy));
+}
 
+static char *
+set_dict(c, v)
+	PyClassObject *c;
+	PyObject *v;
+{
+	if (v == NULL || !PyDict_Check(v))
+		return "__dict__ must be a dictionary object";
+	set_slot(&c->cl_dict, v);
+	set_attr_slots(c);
 	return "";
 }
 
@@ -263,6 +268,7 @@ set_bases(c, v)
 			return "a __bases__ item causes an inheritance cycle";
 	}
 	set_slot(&c->cl_bases, v);
+	set_attr_slots(c);
 	return "";
 }