diff --git a/Lib/test/test_set.py b/Lib/test/test_set.py
index 45f61b2..b46cac4 100644
--- a/Lib/test/test_set.py
+++ b/Lib/test/test_set.py
@@ -285,10 +285,14 @@
         s = self.thetype(d)
         self.assertEqual(sum(elem.hash_count for elem in d), n)
         s.difference(d)
-        self.assertEqual(sum(elem.hash_count for elem in d), n)    
+        self.assertEqual(sum(elem.hash_count for elem in d), n)
         if hasattr(s, 'symmetric_difference_update'):
             s.symmetric_difference_update(d)
-        self.assertEqual(sum(elem.hash_count for elem in d), n)      
+        self.assertEqual(sum(elem.hash_count for elem in d), n)     
+        d2 = dict.fromkeys(set(d))
+        self.assertEqual(sum(elem.hash_count for elem in d), n)
+        d3 = dict.fromkeys(frozenset(d))
+        self.assertEqual(sum(elem.hash_count for elem in d), n)
 
 class TestSet(TestJointOps):
     thetype = set