djinn software package provides generate Haskell expressions from types, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install djinn
djinn is installed in your system.
Make ensure the djinn package were installed using the commands given below,
$ sudo dpkg-query -l | grep djinn *
You will get with djinn package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Haskell |
| Package | djinn |
| Version | 2014.9.7-6 |
| Description | generate Haskell expressions from types |
| Sub Section | Haskell |