libghc-semigroups-doc 0.16.2.2-1build1 (amd64 binary) in ubuntu xenial

 It contains a Haskell 98 logically-uninhabited data type used to
 indicate that a given term should not exist.
 .
 This package provides the documentation for a library for the Haskell
 programming language.
 See http://www.haskell.org/ for more information on Haskell.