libghc-haddock-library-dev 1.5.0.1-2 (amd64 binary) in ubuntu eoan

 Haddock is a documentation-generation tool for Haskell
 libraries. These modules expose some functionality of it
 without pulling in the GHC dependency.
 .
 For interacting with Haddock itself, see the ‘haddock’ package.
 .
 This package provides a library for the Haskell programming language.
 See http://www.haskell.org/ for more information on Haskell.