Install libghc-snap-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-snap-doc
Description:
Snap Web Framework; documentation
This is the top-level package for the official Snap Framework libraries. It includes: . * The Snaplets API . * Snaplets for sessions, authentication, and templates . 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://snapframework.com/
Version: 1.0.0.2-2build4
Section: universe/doc