diff -r ea421c534305 Lib/test/test_traceback.py
--- a/Lib/test/test_traceback.py	Sat Dec 17 07:08:30 2011 +0100
+++ b/Lib/test/test_traceback.py	Sun Dec 18 00:24:46 2011 +0100
@@ -300,6 +300,10 @@
         msg = self.get_report(e).splitlines()
         self.assertEqual(msg[-2], '              ^')
 
+class PrintExceptionTests(unittest.TestCase):
+
+    def test_print_exception_with_none(self):
+        self.assertEqual(None, traceback.print_exception(None, None, None))
 
 class PyExcReportingTests(BaseExceptionReportingTests, unittest.TestCase):
     #