libghc-text-dev 1.2.2.0-1 (amd64 binary) in ubuntu xenial

 This is a Haskell time and space-efficient implementation of Unicode
 text using packed Word16 arrays. Suitable for performance critical use,
 both in terms of large data quantities and high speed.
 .
 It supports many basic string operations and has some substring search
 tools.
 .
 This package provides a library for the Haskell programming language.
 See http://www.haskell.org/ for more information on Haskell.