Install libghc-dependent-sum-template-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-dependent-sum-template-doc
Description:
Automatically generate instances of classes in dependent-sum package; documentation
Using the Template Haskell code in this package, you can create instances for classes liek GEq and GCompare automatically. . 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/dependent-sum-template
Version: 0.0.0.6-1build4
Section: universe/doc