Issue #23782: Fixed possible memory leak in _PyTraceback_Add() and exception

loss in PyTraceBack_Here().

diff --cc Misc/NEWS
index e0ec447487ab4a4ad5300a8ad109577e94c11abf,5d972fdea804ea73f5bcede44eb2d60b6ba2030d..f5a36f0f412a1aa00c0f7a277e5cb4f70a1983be
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -10,6 -10,38 +10,9 @@@ What's New in Python 3.7.0 alpha 
  Core and Builtins
  -----------------
  
 -Library
 --------
 -
 -- Issue #24452: Make webbrowser support Chrome on Mac OS X.
 -
 -- Issue #20766: Fix references leaked by pdb in the handling of SIGINT
 -  handlers.
 -
 -Build
 ------
 -
 -- Issue #28208: Update Windows build to use SQLite 3.14.2.0.
 -
 -- Issue #28248: Update Windows build to use OpenSSL 1.0.2j.
 -
 -Tests
 ------
 -
 -- Issue #28409: regrtest: fix the parser of command line arguments.
 -
 -
 -What's New in Python 3.6.0 beta 2
 -=================================
 -
 -*Release date: 2016-10-10*
 -
 -Core and Builtins
 ------------------
 -
+ - Issue #23782: Fixed possible memory leak in _PyTraceback_Add() and exception
+   loss in PyTraceBack_Here().
+ 
  - Issue #28183: Optimize and cleanup dict iteration.
  
  - Issue #26081: Added C implementation of asyncio.Future.