[issue3611] invalid exception context

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

Ok, it was not enough: exc_{type,value,traceback} have to be 
saved/restored. So here is a new patch. I doesn't change Python 
behaviour for previous pitrou snippet (msg71658): it doesn't crash 
here and display two errors.

I think that this issue mix differents bugs:
 (1) lostcontext.py fixed by « if (why == WHY_EXCEPTION 
&& !throwflag) »
 (2) pitrou snippet
 (3) PyErr_SetObject() is no re-entrant: not fixed yet (please review 
my new patch attached to this comment ;-))

Added file: http://bugs.python.org/file11203/pyerr_setobject_reentrant-v2.patch

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