[issue2334] Backport set comprehensions

[Alexandre Vassalotti]

Changes by Alexandre Vassalotti <alexandre at peadrop.com>:


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resolution:  -> duplicate
stage:  -> committed/rejected
status: open -> closed
superseder:  -> Backport set and dict comprehensions

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue2334>
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