fill in actual issue number in tests

Lib/test/test_deque.py

@@ -420,7 +420,7 @@ class TestBasic(unittest.TestCase):
             gc.collect()
 
     def test_container_iterator(self):
-        # Bug # XXX: tp_traverse was not implemented for deque iterator objects
+        # Bug #3680: tp_traverse was not implemented for deque iterator objects
         class C(object):
             pass
         for i in range(2):

Lib/test/test_dict.py

@@ -556,7 +556,7 @@ class DictTest(unittest.TestCase):
         d = {}
 
     def test_container_iterator(self):
-        # Bug # XXX: tp_traverse was not implemented for dictiter objects
+        # Bug #3680: tp_traverse was not implemented for dictiter objects
         class C(object):
             pass
         iterators = (dict.iteritems, dict.itervalues, dict.iterkeys)

Lib/test/test_set.py

@@ -324,7 +324,7 @@ class TestJointOps(unittest.TestCase):
         self.assertEqual(d3, dict.fromkeys(d, 123))
 
     def test_container_iterator(self):
-        # Bug # XXX: tp_traverse was not implemented for set iterator object
+        # Bug #3680: tp_traverse was not implemented for set iterator object
         class C(object):
             pass
         obj = C()