Install libghc-classy-prelude-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-classy-prelude-doc
Description:
typeclass-based prelude; documentation
Focuses on using common typeclasses when possible, and creating new ones to avoid name clashing. Exposes many recommended datastructures (Map, ByteString, etc) directly without requiring long import lists and qualified modules. . This package provides the documentation for a library for the Haskell programming language. See http://www.haskell.org/ for more information on Haskell.
Homepage: https://github.com/snoyberg/classy-prelude
Version: 1.2.0.1-1build5
Section: universe/doc