asyncio: Sync with github
diff --git a/Lib/test/test_asyncio/test_base_events.py b/Lib/test/test_asyncio/test_base_events.py
index 072fe2f..dff01d2 100644
--- a/Lib/test/test_asyncio/test_base_events.py
+++ b/Lib/test/test_asyncio/test_base_events.py
@@ -782,7 +782,7 @@
         self.loop._selector.select.return_value = (event_sentinel,)
 
         for i in range(1, 3):
-            with self.subTest('Loop %d/2' % i):
+            # with self.subTest('Loop %d/2' % i):  # Not in Python 3.3.
                 self.loop.call_soon(self.loop.stop)
                 self.loop.run_forever()
                 self.assertEqual(callcount, 1)