libghc-focuslist-dev 0.1.0.2-2build3 (amd64 binary) in ubuntu hirsute

 A FocusList is a sequence of elements which has one element as its
 Focus. It supports quick insertion and indexing by its implementation
 with Seq.
 .
 This package provides a library for the Haskell programming language.
 See http://www.haskell.org/ for more information on Haskell.