From 239aba7874d83eee798b19fe3fc11880516fb356 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Mon, 20 Jul 2015 03:09:22 -0400
Subject: Issue #19663: Improve error message for defaultdict.

---
 Modules/_collectionsmodule.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c
index 627fad5..65803a4 100644
--- a/Modules/_collectionsmodule.c
+++ b/Modules/_collectionsmodule.c
@@ -1682,7 +1682,7 @@ defdict_init(PyObject *self, PyObject *args, PyObject *kwds)
             newdefault = PyTuple_GET_ITEM(args, 0);
             if (!PyCallable_Check(newdefault) && newdefault != Py_None) {
                 PyErr_SetString(PyExc_TypeError,
-                    "first argument must be callable");
+                    "first argument must be callable or None");
                 return -1;
             }
         }
-- 
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