This demo is live on Heroku:
http://haskell-buildpack-demo.herokuapp.com/
It uses the Haskell Buildpack:
https://github.com/pufuwozu/heroku-buildpack-haskell
Clone this repository:
git clone https://github.com/pufuwozu/haskell-buildpack-demo.git
Create a new Heroku application:
heroku create --stack=cedar --buildpack https://github.com/pufuwozu/heroku-buildpack-haskell.git
Push!
git push heroku master
Note: the push will take some time to install dependencies and might not show any output for quite a while. It will also show a lot of warnings.