Haskell-src-exts (hsx, haskell-source with extensions) is an extension of the standard haskell-src package, and handles most common syntactic extensions to haskell, including:
* multi-parameter type classes with functional dependencies
* indexed type families (including associated types)
* empty data declarations
* gadts
* implicit parameters (ghc and hugs style)
* template haskell
this package provides a library for the haskell programming language. see http://www.haskell.org/ for more information on haskell.