Install hlint by entering the following commands in the terminal:
sudo apt update sudo apt install hlint
Description:
Haskell source code suggestions
HLint gives suggestions on how to improve your source code. It can either print them directly, or generate a colored HTML output.
Homepage: http://community.haskell.org/~ndm/hlint/
Version: 2.0.11-1build1
Section: universe/haskell