Install libghc-monadplus-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-monadplus-doc
Description:
Haskell98 partial maps and filters over MonadPlus; documentation
Filtering and folding over arbitrary `MonadPlus` instances. This package generalizes many common stream operations such as `filter`, `catMaybes` etc. . 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://hackage.haskell.org/package/monadplus
Version: 1.4.2-3build1
Section: universe/doc