[issue21362] concurrent.futures does not validate that max_workers is proper

[Claudiu.Popa]

Claudiu.Popa added the comment:

Attached patch with improvements suggested by Charles-François Natali. Thank you for the review.

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Added file: http://bugs.python.org/file35057/issue21362.patch

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<http://bugs.python.org/issue21362>
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