libghc-monoid-extras-doc 0.4.2-3build3 (amd64 binary) in ubuntu bionic

 This package contains various extra monoid-related definitions and utilities,
 such as monoid actions, monoid coproducts, "deletable" monoids, "split"
 monoids, and "cut" monoids.
 .
 This package provides the documentation for a library for the Haskell
 programming language.
 See http://www.haskell.org/ for more information on Haskell.