[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:

Attached simple benchmark script to check for any slowdowns introduced
by the planned with statement changes.

Added file: http://bugs.python.org/file13264/pep377_bench.py

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