Make reversed() transparent with respect to length.
diff --git a/Lib/test/test_enumerate.py b/Lib/test/test_enumerate.py
index ab1a60d..00ecbcc 100644
--- a/Lib/test/test_enumerate.py
+++ b/Lib/test/test_enumerate.py
@@ -145,6 +145,10 @@
         s = 'hello'
         self.assertEqual(list(reversed(reversed(s))), list(s))
 
+    def test_len(self):
+        s = 'hello'
+        self.assertEqual(len(reversed(s)), len(s))
+
 def test_main(verbose=None):
     testclasses = (EnumerateTestCase, SubclassTestCase, TestEmpty, TestBig,
                    TestReversed)