[issue19946] Handle a non-importable __main__ in multiprocessing

[Nick Coghlan]

Nick Coghlan added the comment:

Current work in progress patch. The existing multiprocessing tests all pass, but the new main handling tests fail.

The fork start_method passes all the tests
The forkserver and spawn start methods fail the directory, zipfile and package tests.

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Added file: http://bugs.python.org/file33162/issue19946_pep_451_multiprocessing_v2.diff

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