Install libghc-monad-unlift-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-monad-unlift-doc
Description:
typeclasses for representing monad transformer unlifting; documentation
This package provides typeclasses for providing for unlifting of monad transformers and stacks. . Note that concrete implementations of common transformers implementing these type classes are provided by the monad-unlift-ref 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: https://github.com/fpco/monad-unlift
Version: 0.2.0-3build6
Section: universe/doc