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

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

I'm definitely not happy with the effect the current patch has on with
statement execution speed - I think I'll try to come up with a patch
that adds a new SETUP_WITH opcode and see how that performs.

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