[docs] [issue24136] document PEP 448: unpacking generalization

[Martin Panter]

Martin Panter added the comment:

Thanks for the review. I committed my patch in the hope that it makes it into 3.5.2, but if people want to suggest further improvements etc that is okay.

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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<http://bugs.python.org/issue24136>
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