[issue2833] __exit__ silences the active exception

[Antoine Pitrou]

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

I've just discovered that the patch in r62847 doesn't clean up the
exception state if the except clause does not mention a local variable,
e.g. "except MyException" instead of "except MyException as e".

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Tracker <report at bugs.python.org>
<http://bugs.python.org/issue2833>
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