While attempting to do some sorting, I ran across Down. The docs: http://hackage.haskell.org/packages/archive/base/latest/doc/html/Data-Ord.html#t:Down say it's in Data.Ord, but GHCi 7.4.1 complains the Down data constructor isn't in scope, but if I import GHC.Exts (http://hackage.haskell.org/packages/archive/base/latest/doc/html/GHC-Exts.html#t:Down), I get the constructor I expect.