diff -r 469ff344f8fd Objects/typeobject.c
--- a/Objects/typeobject.c	Sat Jan 31 12:20:40 2015 -0800
+++ b/Objects/typeobject.c	Sun Feb 01 14:23:48 2015 +0200
@@ -2690,6 +2690,14 @@ PyType_FromSpecWithBases(PyType_Spec *sp
         _PyDict_SetItemId(type->tp_dict, &PyId___module__,
             PyUnicode_FromStringAndSize(
                 spec->name, (Py_ssize_t)(s - spec->name)));
+    else {
+        if (PyErr_WarnFormat(PyExc_SyntaxWarning, 1,
+                "builtin type %.200s has no the __module__ attribute",
+                spec->name)) {
+            Py_DECREF(res);
+            return NULL;
+        }
+    }
 
     return (PyObject*)res;