Issue #4183: Some tests didn't run with pickle.HIGHEST_PROTOCOL.
diff --git a/Lib/test/test_xrange.py b/Lib/test/test_xrange.py
index 7a2eea5..7e2a1a3 100644
--- a/Lib/test/test_xrange.py
+++ b/Lib/test/test_xrange.py
@@ -61,7 +61,7 @@
     def test_pickling(self):
         testcases = [(13,), (0, 11), (-22, 10), (20, 3, -1),
                      (13, 21, 3), (-2, 2, 2)]
-        for proto in range(pickle.HIGHEST_PROTOCOL):
+        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
             for t in testcases:
                 r = xrange(*t)
                 self.assertEquals(list(pickle.loads(pickle.dumps(r, proto))),