[issue19946] Handle a non-importable __main__ in multiprocessing

[Nick Coghlan]

Changes by Nick Coghlan <ncoghlan at gmail.com>:


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title: Have multiprocessing raise ImportError when spawning a process that can't find the "main" module -> Handle a non-importable __main__ in multiprocessing

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19946>
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