ekmett/lens — pull request #352 by sonyandy (2013-10-17 02:02:12+00:00)
Title: ensure Control.Lens.Tuple builds with ghc-7.4.2

It looks like `tagged` does not enable `PolyKinds` for ghc-7.4. It may be worth just removing use of `DataKinds` entirely for ghc-7.4.2.