Nick Coghlan added the comment:

Implementing this is actually likely to require non-trivial restructuring of 
the runpy internals. contextlib.ExitStack may prove useful in making it easier 
to programmatically select amongst different context managers.

The __mp_main__ helpers in multiprocessing should also be able to take 
advantage of this once it is available, and it may prove useful in finally 
providing -m analogues for pdb etc that play nice when an exception occurs (see 
issue 9325).

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<http://bugs.python.org/issue19982>
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