[issue2335] Backport set literals

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

Guido, I thought you had decided for this to just be a 3.x feature.

Alex, if this goes forward, were you also going to change the repr() for
sets and the corresponding pprint code?  Are set comprehensions on the
radar screen also.  IMO, these all go hand in hand.

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assignee:  -> gvanrossum
nosy: +gvanrossum, rhettinger
priority: critical -> normal

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