Convert iterator __len__() methods to a private API.
diff --git a/Lib/test/test_itertools.py b/Lib/test/test_itertools.py
index 5db128c..635d156 100644
--- a/Lib/test/test_itertools.py
+++ b/Lib/test/test_itertools.py
@@ -670,6 +670,7 @@
 class LengthTransparency(unittest.TestCase):
 
     def test_repeat(self):
+        from test.test_iterlen import len
         self.assertEqual(len(repeat(None, 50)), 50)
         self.assertRaises(TypeError, len, repeat(None))