Install libghc-dependent-sum-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-dependent-sum-doc
Description:
Dependent sum type; documentation
Dependent sums and supporting typeclasses for comparing and formatting them. . 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/mokus0/dependent-sum
Version: 0.4-1
Section: universe/doc