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Haskell Symposium 2021

** Virtual **, 26–27 August 2021
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Early track:
Submission deadline: 19 March 2021 Friday
Notification: 23 April 2021 Friday
Regular track and demos:
Submission deadline: 21 May 2021 Friday
Notification: 23 June 2021 Friday
Camera ready: 5 July 2021 Monday
Deadlines valid anywhere on Earth
Submission details
Program Committee
Chair's e-mail: j.hage@uu.nl
Edwin BradyUniversity of St Andrews
Koen Claessen Chalmers University of Technology
Dominique Devriese Vrije Universiteit Brussel
Andy Gill University of Kansas
Jurriaan Hage (chair) Universiteit Utrecht
Zhenjiang Hu Peking University
Ranjit Jhala University of California
Patricia Johann Appalachian State University
Yukiyoshi Kameyama University of Tsukuba
George Karachalias Tweag
Ralf Lämmel University of Koblenz-Landau
Daan Leijen Microsoft Research
Ben Lippmeier Ghost Locomotion
Neil Mitchell Facebook
Alberto Pardo Universidad de la República, Uruguay
Matt Roberts Macquarie University
Janis Voigtländer University of Duisburg-Essen
Nicolas Wu Imperial College London

The ACM SIGPLAN Haskell Symposium 2021 will be co-located with the 2021 International Conference on Functional Programming (ICFP), that will be held ** virtually **.

Please use the ICFP website to register for the Symposium. Note: this website has the same content as this one, under the ICFP umbrella.


The Haskell Symposium presents original research on Haskell, discusses practical experience and future development of the language, and promotes other forms of declarative programming.

Topics of interest include:

Regular papers should explain their research contributions in both general and technical terms, identifying what has been accomplished, explaining why it is significant, and relating it to previous work, and to other languages where appropriate.

Experience reports and functional pearls need not necessarily report original academic research results. For example, they may instead report reusable programming idioms, elegant ways to approach a problem, or practical experience that will be useful to other users, implementors, or researchers. The key criterion for such a paper is that it makes a contribution from which other Haskellers can benefit. It is not enough simply to describe a standard solution to a standard programming problem, or report on experience where you used Haskell in the standard way and achieved the result you were expecting.

A new submission category for this year's Haskell Symposium is the tutorial. Like with the experience report and the functional pearl, the key criterion for such a paper is that it makes a contribution from which other Haskellers can benefit. What distinguishes a tutorial is that its focus is on explaining an aspect of the Haskell language and/or ecosystem in a way that is generally useful to a Haskell audience. Tutorials for many such topics can be found online; the distinction here is that by writing it up for formal review it will be vetted by experts and formally published.

System demonstrations should summarize the system capabilities that would be demonstrated. The proposals will be judged on whether the ensuing session is likely to be important and interesting to the Haskell community at large, whether on grounds academic or industrial, theoretical or practical, technical, social or artistic. Please contact the program chair with any questions about the relevance of a proposal.

If your contribution is not a research paper, please mark the title of your experience report, functional pearl, tutorial or system demonstration as such, by supplying a subtitle (Experience Report, Functional Pearl, Tutorial Paper, System Demonstration).

Submission Details

Page Limits
Regular paper12 pages
Functional pearl12 pages
Tutorial12 pages
Experience report6 pages
Demo proposal2 pages

[Early and Regular Track] The Haskell Symposium uses a two-track submission process so that some papers can gain early feedback. Strong papers submitted to the early track are accepted outright, and the others will be given their reviews and invited to resubmit to the regular track. Papers accepted via the early and regular tracks are considered of equal value and will not be distinguished in the proceedings. Although all papers may be submitted to the early track, authors of functional pearls and experience reports are particularly encouraged to use this mechanism. The success of these papers depends heavily on the way they are presented, and submitting early will give the program committee a chance to provide feedback and help draw out the key ideas.

[Formatting] Submitted papers should be in portable document format (PDF), formatted using the ACM SIGPLAN style guidelines.

[Lightweight Double-blind Reviewing] Haskell Symposium 2021 will use a lightweight double-blind reviewing process. To facilitate this, submitted papers must adhere to two rules:

  1. Author names and institutions must be omitted, and
  2. References to authors’ own related work should be in the third person (e.g., not “We build on our previous work …” but rather “We build on the work of …”).
The purpose of this process is to help the reviewers come to an initial judgment about the paper without bias, not to make it impossible for them to discover the authors if they were to try. Nothing should be done in the name of anonymity that weakens the submission or makes the job of reviewing the paper more difficult (e.g., important background references should not be omitted or anonymized). In addition, authors should feel free to disseminate their ideas or draft versions of their paper as they normally would. For instance, authors may post drafts of their papers on the web or give talks on their research ideas.

A reviewer will learn the identity of the author(s) of a paper after a review is submitted.

[Limits] The length of submissions should not exceed the following limits:
Regular paper: 12 pages
Functional pearl: 12 pages
Tutorial: 12 pages
Experience report: 6 pages
Demo proposal: 2 pages
There is no requirement that all pages are used. For example, a functional pearl may be much shorter than 12 pages. In all cases, the list of references is not counted against these page limits.


As a published ACM author, you and your co-authors are subject to all ACM Publications Policies, including SIGPLAN's republication policy, ACM's policies on plagiarism, and ACM's new Publications Policy on Research Involving Human Participants and Subjects.

Program Committee members are allowed to submit papers, but their papers will be held to a higher standard.

The paper submission deadline and length limitations are firm There will be no extensions, and papers violating the length limitations will be summarily rejected.

Papers should be submitted through HotCRP.

Improved versions of a paper may be submitted at any point before the submission deadline using the same web interface.

Supplementary material: Authors have the option to attach supplementary material to a submission, on the understanding that reviewers may choose not to look at it. This supplementary material should not be submitted as part of the main document; instead, it should be uploaded as a separate PDF document or tarball.

Supplementary material should be uploaded at submission time, not by providing a URL in the paper that points to an external repository.

Authors are free to upload both anonymized and non-anonymized supplementary material. Anonymized supplementary material will be visible to reviewers immediately; non-anonymized supplementary material will be revealed to reviewers only after they have submitted their review of the paper and learned the identity of the author(s).

Resubmitted Papers: Authors who submit a revised version of a paper that has previously been rejected by another conference have the option to attach an annotated copy of the reviews of their previous submission(s), explaining how they have addressed these previous reviews in the present submission. If a reviewer identifies him/herself as a reviewer of this previous submission and wishes to see how his/her comments have been addressed, the principal editor will communicate to this reviewer the annotated copy of his/her previous review. Otherwise, no reviewer will read the annotated copies of the previous reviews.


Accepted papers will be included in the ACM Digital Library. Their authors will be required to choose one of the following options:

For more information, please see ACM Copyright Policy and ACM Author Rights.

Accepted proposals for system demonstrations will be posted on the symposium website but not formally published in the proceedings.

Publication date: The official publication date of accepted papers is the date the proceedings are made available in the ACM Digital Library. This date may be up to two weeks prior to the first day of the conference. The official publication date affects the deadline for any patent filings related to published work.


Authors of accepted papers are encouraged to make auxiliary material (artifacts like source code, test data, etc.) available with their paper. They can opt to have these artifacts published alongside their paper in the ACM Digital Library (copyright of artifacts remains with the authors).

[Badge] If an accepted paper's artifacts are made permanently available for retrieval in a publicly accessible archival repository like the ACM Digital Library, that paper qualifies for an Artifacts Available badge. Applications for such a badge can be made after paper acceptance and will be reviewed by the PC chair.