Port r69837: Fix keyword arguments for itertools.count(). Step arg without a start arg was ignored.
diff --git a/Lib/test/test_itertools.py b/Lib/test/test_itertools.py
index cf0ca24..af2efa0 100644
--- a/Lib/test/test_itertools.py
+++ b/Lib/test/test_itertools.py
@@ -354,6 +354,10 @@
 
     def test_count_with_stride(self):
         self.assertEqual(lzip('abc',count(2,3)), [('a', 2), ('b', 5), ('c', 8)])
+        self.assertEqual(lzip('abc',count(start=2,step=3)),
+                         [('a', 2), ('b', 5), ('c', 8)])
+        self.assertEqual(lzip('abc',count(step=-1)),
+                         [('a', 0), ('b', -1), ('c', -2)])
         self.assertEqual(lzip('abc',count(2,0)), [('a', 2), ('b', 2), ('c', 2)])
         self.assertEqual(lzip('abc',count(2,1)), [('a', 2), ('b', 3), ('c', 4)])
         self.assertEqual(lzip('abc',count(2,3)), [('a', 2), ('b', 5), ('c', 8)])