comment the skipping of the current frame

Author: ebonnal

Lib/test/test_concurrent_futures/executor.py

@@ -77,7 +77,10 @@ def test_map_exception(self):
         )
 
         frames = map(itemgetter(0), traceback.walk_tb(exception.__traceback__))
+
+        # skip current frame
         next(frames)
+
         self.assertFalse(
             [
                 (var, val)