alternative format for Haskell packages; documentation

 hpack is a tool to create the usual Haskell packaging metadata, i.e. the
 .cabal file, from a YAML description of the program, with some fields field in
 by inferred defaults and other additional conveniences.
 .
 This package provides the documentation for a library for the Haskell
 programming language.
 See http://www.haskell.org/ for more information on Haskell.