happy software package provides Parser generator for Haskell, you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install happy
happy is installed in your system.
Make ensure the happy package were installed using the commands given below,
$ sudo dpkg-query -l | grep happy *
You will get with happy package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Haskell |
| Package | happy |
| Version | 1.19.4-1+b2 [arm64], 1.19.4-1+ |
| Description | Parser generator for Haskell |
| Sub Section | Haskell |
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