ekmett/trifecta — pull request #26 by aavogt (2014-02-17 20:06:57+00:00)
Title: GHC.Exts exports a toList/fromList with ghc-7.8

you could also `import GHC.Exts hiding (toList, fromList)`, but that's a warning with ghc-7.6 and an error with earlier versions of ghc.