Install libghc-contravariant-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-contravariant-doc
Description:
Contravariant functors; documentation
This packages provides a type class for contravariant functors, i.e. those with a method contramap :: (a -> b) -> f b -> f a. . 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://github.com/ekmett/contravariant/
Version: 1.4-3build2
Section: universe/doc