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Hac4: Haskell Hackathon

Dates: Apr 11-13, 2008.

Chalmers University of Technology, Göteborg, Sweden


The 4th Haskell Hackathon will be held over 3 days, April 11-13 2008, at the Department of Computer Science and Engineering at Chalmers University of Technology in Göteborg, Sweden. It is a coding festival, focusing on producing and improving Haskell libraries, tools and infrastructure.

To attend, please register, and get ready to hack!

The Hackathon itself will be free, but you will have to pay for travel, accommodation and food.


If you will be attending, please register. Numbers may be limited, depending on availablity of space.


Map of Hac4 location, including some accomodation and travel info

Getting there


There are two airports close to Göteborg, Göteborg Landvetter Airport (GOT) and Göteborg City Airport (GSE). Landvetter airport is the main airport. It is serviced by a large number of airlines. Despite the name, Göteborg City Airport is less convenient to get to and from, since the airport bus runs less frequently. Its main advantage is that it is serviced by budget airlines, mainly Ryanair. See the Wikipedia pages linked to above for more airline and destination information.

Because of the excellent connections between Göteborg Landvetter Airport (GOT) and Chalmers, arriving early in the morning of the first day and leaving in the evening of the last day is entirely possible. The airport bus runs every 15-20 min, and takes 20 min from GOT to Korsvägen, and from Korsvägen to Chalmers, trams 6 and 8 run about every 10 min, taking only a few minutes. From experience, we know that it's better to be on time the first day and leave early the last day, rather than the opposite.


SJ has fast train connections to Stockholm, Oslo and Copenhagen, and overnight trains to other european destinations. The trains arrive at the Central Station, right in the city center.


Stena Line operates ferries from continental Europe along two routes. Fredrikshavn (Denmark) can be reached in 2h on a high-speed craft and in 3.15h on a car ferry. Kiel (Germany) can be reached in 14h. The terminals are situated near the city center.

Local transportation

The Landvetter Airport Bus stops at Korsvägen, where you can take trams 6 or 8 to Chalmers. Tram 7 takes you from the Central Station to Chalmers. See the map of the tram and trunk bus network for more information. The Chalmers stop is located somewhat below the center of the map.


The Hac4 map includes these accomodation options:

  • SGS Veckobostäder rents rooms in a student housing complex close to Chalmers. The price depends on the length of stay. 3 nights cost SEK 1140 for a single room, 1450 for a double room, and 1690 for a four bed room. The web site is mostly in Swedish. E-mail vb@sgsveckobostader.se or call +46 31 333 63 90.
  • Göteborgs Vandrarhem, a youth hostel with prices starting from SEK 200 per person per night, depending on the size of the room. Unfortunately the site is in Swedish only, but try e-mailing info@goteborgsvandrarhem.se or calling +46 31 401050. This is a bit further from Chalmers than the other 3 options.
  • Nice Bed & Breakfast is also located close to Chalmers. Single rooms from SEK 425 per night, double 495, triple 695 and four bed room from SEK 995 per night.
  • Quality Hotel Panorama is located close to Chalmers. Single rooms from SEK 490 per night, and double rooms from SEK 840 per night.


The Hackathon will be held from 10am to 6pm each day, with dinner after at local venues. From experience, we know that it is a good idea to be on time the first day in order not to miss the introductions of all the attendees.


What to bring

  • A laptop
  • Wireless card if necessary. There will be wireless network access. Ethernet access will probably not be available. If you really need ethernet access, please contact the organizers.
  • Power adaptors if necessary. Power sockets in Sweden are CEE 7/4, delivering 230V at 50Hz.
  • Mobile phone

Before you arrive

  • Pick out a couple of projects to work on and familiarise yourself with them
  • Install an up to date Haskell toolchain (preferrably ghc-6.8.2).

Projects to work on

Add ideas here for which you think hacking together as a group (rather than individually) would be beneficial. See also the more detailed projects page.

Group projects

  • Building tests that give 100% code coverage for package base.
  • Lots of Cabal hacking still to be done
  • Bindings for <your favourite C library>
  • Haskell library for <your favourite task>

Other things

Previous Haskell hackathons


IRC channel



in Freenode.


The organisers for the Hackathon are: