Install libghc-th-orphans-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-th-orphans-doc
Description:
orphan instances for TH datatypes; documentation
Orphan instances for TH datatypes. In particular, instances for Ord and Lift, as well as a few missing Show / Eq (Show Eq for Loc, and Ppr for Loc Lit) . 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/th-orphans
Version: 0.13.4-1build3
Section: universe/doc