[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:

First draft of patch attached.

Limitations of this version of the patch:
- includes some unrelated marshal.c changes (improved error messages)
- no tests of the new functionality
- contextlib not changed yet
- no documentation changes

The new semantics are in place though, and the existing test_with and
test_contextlib tests all still pass.

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keywords: +patch
Added file: http://bugs.python.org/file13330/pep377_v1.diff

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