[issue5251] contextlib.nested inconsistent with, well, nested with statements due exceptions raised in __enter__

[Nick Coghlan]

Changes by Nick Coghlan <ncoghlan at gmail.com>:


----------
versions: +Python 3.2 -Python 3.0

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5251>
_______________________________________