[issue27122] Hang with contextlib.ExitStack and subprocess.Popen (regression)

[Nick Coghlan]

Nick Coghlan added the comment:

There's an existing scenario test at https://hg.python.org/cpython/file/default/Lib/test/test_contextlib.py#l600 and https://hg.python.org/cpython/file/default/Lib/test/test_contextlib.py#l648 that aims to ensure ExitStack unwinding and context setting matches the behaviour of actual with statements.

It wouldn't hurt to add some explicit checks to the new test for this particular bug, though.

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<http://bugs.python.org/issue27122>
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