[docs] [issue23677] Mention dict and set comps in library reference

Josh Rosenberg added the comment: Heck, with the addition of additional unpacking generalizations in 3.5, you can make an empty set even without a comprehension: {*()} Not really recommending the "one-eyed monkey operator", but the addition of unpacking generalizations undoes several of the limits on literals that previously existed. ---------- nosy: +josh.r _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue23677> _______________________________________