Install libghc-prettyclass-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-prettyclass-doc
Description:
Pretty printing class similar to Show.; documentation
Pretty printing class similar to Show, based on the HughesPJ pretty printing library. Provides the pretty printing class and instances for the Prelude types. . 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/prettyclass
Version: 1.0.0.0-6build1
Section: universe/doc