[issue2507] Exception state lives too long in 3.0

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

This is a complementary patch that should fix the remaining cases
(funnily doctest was relying on the old behaviour).
Unfortunately #2833 still remains, and would probably need some
discussion on the ML for proper resolution.

Added file: http://bugs.python.org/file10424/better_exc_cleanup.patch

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