[issue19946] Handle a non-importable __main__ in multiprocessing

[Nick Coghlan]

Nick Coghlan added the comment:

Issue 19700 isn't quite finished, but I believe it is finished enough to let me get this working properly.

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dependencies:  -Update runpy for PEP 451
resolution: fixed -> 

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<http://bugs.python.org/issue19946>
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