Install libghc-pretty-show-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-pretty-show-doc
Description:
Documentation for Haskell pretty printing library; documentation
A library that can parse derived Show instances into a generic data structure which can then be pretty printed. For complex data structures, the pretty printed version is significantly more readable that the standard Show output. . This package provides the documentation for a library for the Haskell programming language. See http://www.haskell.org/ for more information on Haskell.
Homepage: http://wiki.github.com/yav/pretty-show
Version: 1.6.15-1
Section: universe/doc