diff -r ef3b3f026a51 Objects/typeobject.c
--- a/Objects/typeobject.c	Fri Nov 30 17:35:48 2012 +0100
+++ b/Objects/typeobject.c	Fri Nov 30 18:57:54 2012 +0100
@@ -2387,6 +2387,15 @@
 #include "typeslots.inc"
 };
 
+static PyObject *
+PyObject_FailingNew(PyTypeObject *type, PyObject *args, PyObject *kwargs)
+{
+    PyErr_Format(PyExc_TypeError,
+                "cannot create '%.100s' instances",
+                type->tp_name);
+    return NULL;
+}
+
 PyObject *
 PyType_FromSpecWithBases(PyType_Spec *spec, PyObject *bases)
 {
@@ -2395,7 +2404,7 @@
     char *s;
     char *res_start = (char*)res;
     PyType_Slot *slot;
-    
+
     /* Set the type name and qualname */
     s = strrchr(spec->name, '.');
     if (s == NULL)
@@ -2416,7 +2425,7 @@
     type->tp_name = spec->name;
     if (!type->tp_name)
         goto fail;
-    
+
     /* Adjust for empty tuple bases */
     if (!bases) {
         base = &PyBaseObject_Type;
@@ -2449,6 +2458,10 @@
         goto fail;
     }
 
+    if(!type->tp_new){
+       type->tp_new = PyObject_FailingNew;
+    }
+
     /* Initialize essential fields */
     type->tp_as_number = &res->as_number;
     type->tp_as_sequence = &res->as_sequence;