From 6c0ff8aacd5b493892878e138b97af66e4bfaf37 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Tue, 18 Mar 2008 23:33:08 +0000
Subject: Issue: 2354: Add 3K warning for the cmp argument to list.sort() and
 sorted().

---
 Objects/listobject.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Objects/listobject.c b/Objects/listobject.c
index 9a8b64e..9e86592 100644
--- a/Objects/listobject.c
+++ b/Objects/listobject.c
@@ -2037,6 +2037,11 @@ listsort(PyListObject *self, PyObject *args, PyObject *kwds)
 	}
 	if (compare == Py_None)
 		compare = NULL;
+	if (compare == NULL && 
+            Py_Py3kWarningFlag &&
+	    PyErr_Warn(PyExc_DeprecationWarning, 
+		       "In 3.x, the cmp argument is no longer supported.") < 0)
+		return NULL;
 	if (keyfunc == Py_None)
 		keyfunc = NULL;
 	if (compare != NULL && keyfunc != NULL) {
-- 
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