Issue #13188: When called without an explicit traceback argument,

generator.throw() now gets the traceback from the passed exception's
``__traceback__`` attribute.  Patch by Petri Lehtinen.

diff --cc Misc/NEWS
index 375b945c20091ef381adfd65a79e8769ccfd2547,dd31b4bb59f7133410dec8e4551bb2d2934b93aa..24fadae6cc8c9eb594cf842daca239738a1ad293
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -10,8 -10,10 +10,12 @@@ What's New in Python 3.3 Alpha 1
  Core and Builtins
  -----------------
  
+ - Issue #13188: When called without an explicit traceback argument,
+   generator.throw() now gets the traceback from the passed exception's
+   ``__traceback__`` attribute.  Patch by Petri Lehtinen.
+ 
 +- Issue #13146: Writing a pyc file is now atomic under POSIX.
 +
  - Issue #7833: Extension modules built using distutils on Windows will no
    longer include a "manifest" to prevent them failing at import time in some
    embedded situations.

diff --cc Objects/genobject.c
Simple merge