asyncio, Tulip issue 158: Task._step() now also sets self to None if an

exception is raised.  self is set to None to break a reference cycle.

diff --git a/Lib/asyncio/tasks.py b/Lib/asyncio/tasks.py
index 19fa654edbed1355d29f89e60bd486d24ade2760..0967e7e62839fa2473e43efce2f92e738325db5a 100644 (file)
--- a/Lib/asyncio/tasks.py
+++ b/Lib/asyncio/tasks.py
@@ -325,7 +325,7 @@ class Task(futures.Future):
                         'Task got bad yield: {!r}'.format(result)))
         finally:
             self.__class__._current_tasks.pop(self._loop)
-        self = None
+            self = None  # Needed to break cycles when an exception occurs.
 
     def _wakeup(self, future):
         try: