libghc-src-exts-doc 1.23.1-2 (amd64 binary) in ubuntu groovy

 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 the documentation for a library for the Haskell
 programming language.
 See http://www.haskell.org/ for more information on Haskell.