[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:

Second draft attached, this time with tests and sans segmentation faults :)

Limitations of this version of the patch:
- still includes some unrelated marshal.c changes (improved error messages)
- no documentation changes yet

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Added file: http://bugs.python.org/file13336/pep377_v2.diff

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