Install libghc-reform-happstack-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-reform-happstack-doc
Description:
Happstack support for reform; documentation
Reform is a library for building and validating forms using applicative functors. This package add support for using reform with Happstack. . 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://www.happstack.com/
Version: 0.2.5.2-1build1
Section: universe/doc