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ICFP 2017
Sun 3 - Sat 9 September 2017 Oxford, United Kingdom

The Haskell Implementors’ Workshop is a forum for those involved in implementing Haskell systems, infrastructure, libraries and tools, for people generally involved in implementing Haskell technology. We share our work and discuss future directions and collaborations with others.

In 2017, the Haskell Implementors’ Workshop will be co-located with ICFP 2017 in Oxford.

The workshop does not have proceedings. Talks and/or demos are proposed by submitting an abstract and selected by a small program committee. The workshop will be informal and interactive, with a flexible timetable and plenty of room for ad-hoc discussion, demos, and impromptu short talks.

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Sat 9 Sep
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09:00 - 10:10: State of GHCHIW at L1
Chair(s): Richard A. EisenbergBryn Mawr College, USA
09:00 - 09:30
Simon Peyton JonesMicrosoft Research, Cambridge
09:30 - 10:00
Ben GamariWell-Typed LLP
10:00 - 10:10
Andrey Mokhov, Zhen ZhangUniversity of Washington, Ben GamariWell-Typed LLP, Neil Mitchell
10:30 - 11:30: Compiling to LLVMHIW at L1
Chair(s): Jan StolarekUniversity of Edinburgh, UK
10:30 - 10:55
Kavon FarvardinUniversity of Chicago, Simon Peyton JonesMicrosoft Research, Cambridge
10:55 - 11:20
Siddharth BhatIIT Hyderabad
11:20 - 11:30
12:00 - 12:25: ConstraintsHIW at L1
Chair(s): Ben GamariWell-Typed LLP
12:00 - 12:25
J. Garrett MorrisUniversity of Kansas, USA
14:00 - 15:00: Working in CoreHIW at L1
Chair(s): Adam GundryWell-Typed LLP
14:00 - 14:25
14:25 - 14:50
Sebastian GrafKarlsruhe Institute of Technology
14:50 - 15:00
15:30 - 16:30: Tool SupportHIW at L1
Chair(s): Wren RomanoX
15:30 - 15:55
15:55 - 16:20
16:20 - 16:30
16:50 - 17:50: All Broken UpHIW at L1
Chair(s): Bartosz NitkaFacebook
16:50 - 17:15
Philipp SchusterUniversity of Tübingen
17:15 - 17:50

Call for Talks

The Ninth Haskell Implementors’ Workshop is to be held alongside ICFP 2017 this year in Oxford. It is a forum for people involved in the design and development of Haskell implementations, tools, libraries, and supporting infrastructure, to share their work and discuss future directions and collaborations with others.

Talks and/or demos are proposed by submitting an abstract, and selected by a small program committee. There will be no published proceedings. The workshop will be informal and interactive, with open spaces in the timetable and room for ad-hoc discussion, demos, and impromptu short talks.

Scope and target audience

It is important to distinguish the Haskell Implementors’ Workshop from the Haskell Symposium which is also co-located with ICFP 2017. The Haskell Symposium is for the publication of Haskell-related research. In contrast, the Haskell Implementors’ Workshop will have no proceedings – although we will aim to make talk videos, slides and presented data available with the consent of the speakers.

The Implementors’ Workshop is an ideal place to describe a Haskell extension, describe works-in-progress, demo a new Haskell-related tool, or even propose future lines of Haskell development. Members of the wider Haskell community encouraged to attend the workshop – we need your feedback to keep the Haskell ecosystem thriving. Students working with Haskell are specially encouraged to share their work.

The scope covers any of the following topics. There may be some topics that people feel we’ve missed, so by all means submit a proposal even if it doesn’t fit exactly into one of these buckets:

  • Compilation techniques
  • Language features and extensions
  • Type system implementation
  • Concurrency and parallelism: language design and implementation
  • Performance, optimisation and benchmarking
  • Virtual machines and run-time systems
  • Libraries and tools for development or deployment


We invite proposals from potential speakers for talks and demonstrations. We are aiming for 20-minute talks with 5 minutes for questions and changeovers. We want to hear from people writing compilers, tools, or libraries, people with cool ideas for directions in which we should take the platform, proposals for new features to be implemented, and half-baked crazy ideas. Please submit a talk title and abstract of no more than 300 words.

Submissions should be made via HotCRP. The website is:

We will also have a lightning talks session which will be organized on the day. These talks will be 5-10 minutes, depending on available time. Suggested topics for lightning talks are to present a single idea, a work-in-progress project, a problem to intrigue and perplex Haskell implementors, or simply to ask for feedback and collaborators.

Program Committee

  • Richard A. Eisenberg – chair (Bryn Mawr College)
  • Adam Gundry (Well-Typed)
  • Bartosz Nitka (Facebook)
  • Wren Romano (X, formerly Google[x])
  • Alejandro Serrano Mena (Utrecht University)
  • Jan Stolarek (University of Edinburgh)