ekmett/lens — pull request #22 by mvv (2012-08-21 03:34:47+00:00)
Title: Make it compile with GHC 7.6 branch snapshot

1. Use new data types for pragma generation (template-haskell 2.8+)
2. Added `Num` constraint to `traverseBits`
3. Added Rank2Types here and there
(see http://hackage.haskell.org/trac/ghc/ticket/7137)