Install libghc-lens-action-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-lens-action-doc
Description:
Monadic Getters and Folds; documentation
This package contains combinators and types for working with monadic getters and folds as split off from the original lens package. . 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/lens-action/
Version: 0.2.2-1
Section: universe/doc