hoogle software package provides Haskell API Search for Debian system, 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 hoogle
hoogle is installed in your system.
Make ensure the hoogle package were installed using the commands given below,
$ sudo dpkg-query -l | grep hoogle *
You will get with hoogle package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Miscellaneous |
| Package | hoogle |
| Version | 4.2.43-3+b10 [amd64, arm64, i3 |
| Description | Haskell API Search for Debian system |
| Sub Section | Miscellaneous |