Merge 3.4

diff --cc Misc/NEWS
index 28474bb626f17c143976eb7493389a12a32475d9,e718bcd12117315132a41f6e606396645dc9568a..96fe99e4c5a9272ad9193cd62d72f04c92d13b63
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -92,11 -22,12 +92,15 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #21326: Add a new is_closed() method to asyncio.BaseEventLoop.
+   run_forever() and run_until_complete() methods of asyncio.BaseEventLoop now
+   raise an exception if the event loop was closed.
+ 
  - Issue #21310: Fixed possible resource leak in failed open().
  
 +- Issue #21256: Printout of keyword args should be in deterministic order in
 +  a mock function call. This will help to write better doctests.
 +
  - Issue #21677: Fixed chaining nonnormalized exceptions in io close() methods.
  
  - Issue #11709: Fix the pydoc.help function to not fail when sys.stdin is not a