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FPBT'27 Call for Papers (co-located with POPL'27)
by Ningning Xie 16 Sep '26

16 Sep '26

Call for Papers https://popl27.sigplan.org/home/fpbt-2027 We are excited to announce that the first annual Future of Property-Based Testing Workshop (FPBT'27) will be happening in Mexico City on January 12th (co-located with POPL'27)! FPBT will bring together researchers and educators who work on and teach PBT to talk about what technical advances the research community should focus on in the coming years, and how we can best bring PBT to the next generation of software developers. Submissions are open now (deadline October 23rd); see https://popl27.sigplan.org/home/fpbt-2027 for details.

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[TFP 2027] Call for Papers for the 28th International Symposium on Trends in Functional Programming, Kyoto, Japan, March 2027
by Peter Achten 14 Sep '26

14 Sep '26

# TFP 2027 - Call for Papers (https://trendsfp.github.io/2027/) ## Important Dates Submission deadline (pre-symposium, full papers): Thu 3rd Dec 2026 (AOE) Notification (pre-symposium, full papers): Thu 14th Jan 2027 Submission deadline (pre-symposium, draft papers): Thu 28th Jan 2027 (AOE) Notification (pre-symposium, draft papers): Thu 4th Feb 2027 Submission deadline (post-symposium review): Thu 29th Apr 2027 (AOE)* Notification (post-symposium submissions): Thu 10th Jun 2027* TFPiE Workshop: Mon 12th Mar 2027 TFP Symposium: Sat 13th to Mon 15th Mar 2027 (* tentative) The Symposium on Trends in Functional Programming (TFP) is an international forum for researchers with interests in all aspects of functional programming, taking a broad view of current and future trends in the area. It aspires to be a lively environment for presenting the latest research results, and other contributions. This year, TFP will take place in-person in Kyoto, Japan, held by the Special Interest Group on Programming and Programming Languages (SIG-PPL), Japan Society for Software Science and Technology (JSSST). It is co-located with the Trends in Functional Programming in Education (TFPIE) workshop, which will take on the day before the main symposium. Please be aware that TFP has several submission deadlines. The first, 3rd of December, is for authors who wish to have their full paper reviewed prior to the symposium. Papers that are accepted in this way must also be presented at the symposium. The second, 28th January, is for authors who wish to present their work or work-in-progress at the symposium first without submitting to the full review process for publication. These authors can then take into account feedback received at the symposium and submit a full paper for review by the third deadline, Thu 29th Apr 2027 (AOE) (tentative). ## Scope The symposium recognizes that new trends may arise through various routes. As part of the Symposium's focus on trends we therefore identify the following five paper categories. High-quality submissions are solicited in any of these categories: * Research Papers: Leading-edge, previously unpublished research work * Position Papers: On what new trends should or should not be * Project Papers: Descriptions of recently started new projects * Evaluation Papers: What lessons can be drawn from a finished project * Overview Papers: Summarizing work with respect to a trendy subject Papers must be original and not simultaneously submitted for publication to any other forum. They may consider any aspect of functional programming: theoretical, implementation-oriented, or experience-oriented. Applications of functional programming techniques to other languages are also within the scope of the symposium. Topics suitable for the symposium include, but are not limited to: * Functional programming and multicore/manycore computing * Functional programming in the cloud * High performance functional computing * Extra-functional (behavioural) properties of functional programs * Dependently typed functional programming * Validation and verification of functional programs * Debugging and profiling for functional languages * Functional programming in different application areas: security, mobility, telecommunications applications, embedded systems, global computing, grids, etc. * Interoperability with imperative programming languages * Novel memory management techniques * Program analysis and transformation techniques * Empirical performance studies * Abstract/virtual machines and compilers for functional languages * (Embedded) domain specific languages * New implementation strategies * Any new emerging trend in the functional programming area If you are in doubt on whether your paper is within the scope of TFP, please contact the programme chairs, Alex Gerdes and Kazutaka Matsuda. ## Best Paper Awards TFP awards two prizes for the best papers each year. First, to reward excellent contributions, TFP awards a prize for the best overall paper accepted for the post-conference formal proceedings. Second, each year TFP also awards a prize for the best student paper. TFP traditionally pays special attention to research students, acknowledging that students are almost by definition part of new subject trends. A student paper is one for which the authors state that the paper is mainly the work of students, the students are the paper's first authors, and a student would present the paper. In both cases, it is the PC of TFP that awards the prize. In case the best paper happens to be a student paper, then that paper will receive both prizes. ## Instructions to Authors Submission is via EasyChair: <https://easychair.org/conferences/?conf=tfp2027>. Authors of papers have the choice of having their contributions formally reviewed either before or after the Symposium. Further, pre-symposium submissions may either be full (earlier deadline) or draft papers (later deadline). ## Pre-symposium formal review Papers to be formally reviewed before the symposium should be submitted before the early deadline and will receive their reviews and notification of acceptance for both presentation and publication before the symposium. A paper that has been rejected for publication but accepted for presentation may be revised and resubmitted for the post-symposium formal review. ## Post-symposium formal review Draft papers will receive minimal reviews and notification of acceptance for presentation at the symposium. Authors of draft papers will be invited to submit revised papers based on the feedback received at the symposium. A post-symposium refereeing process will then select a subset of these papers for formal publication. ## Paper categories Draft papers and papers submitted for formal review are submitted as extended abstracts (4 to 10 pages in length) or full papers (up to 20 pages). The submission must clearly indicate which category it belongs to: research, position, project, evaluation, or overview paper. It should also indicate which authors are research students, and whether the main author(s) are students. A draft paper for which all authors are students will receive additional feedback by one of the PC members shortly after the symposium has taken place. ## Format Papers must be written in English, and written using the LNCS style. For more information about formatting please consult the Springer LNCS Guidelines web site (https://www.springer.com/gp/computer-science/lncs/conference-proceedings-gu…) ## Organizing Committee Alex Gerdes University of Gothenburg and Chalmers, SE Program Co-Chair Kazutaka Matsuda Tohoku University, JP Program Co-Chair SIG-PPL Coordination Atsushi Igarashi Kyoto University, JP Local Arrangements Chair Kota Mizushima nextbeat Co., Ltd Sponsorship Chair Casper Bach University of South Denmark, DK General Chair Peter Achten Radboud University Nijmegen, NL Publicity Chair Marco T. Morazán Seton Hall University, US Steering Committee Chair ## Programme Committee <TBA>

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Call for Contributions: BOB 2027 (Berlin, Feb 26 - Deadline Nov 2)
by Michael Sperber 03 Sep '26

03 Sep '26

================================================================================ BOB Conference 2027 "What happens when we use what's best for a change?" https://bobkonf.de/2027/cfc.html Berlin, Feb 26 Call for Contributions Deadline: November 2, 2026 ================================================================================ You are actively engaged in advanced software engineering methods, solve ambitious problem with software and are open to cutting-edge innovation? Attend this conference, meet people that share your goals, and get to know the best software tools and technologies available today. We strive to offer a day full of new experiences and impressions that you can use to immediately improve your daily life as a software developer. If you share our vision and want to contribute, submit a proposal for a talk or tutorial! NOTE: The conference fee will be waived for presenters. Travel expenses will not be covered (for exceptions see "Speaker Grants"). Shepherding ----------- The program committee offers shepherding to all speakers. Shepherding provides speakers assistance with preparing their sessions. Specifically: - advice on structure and presentation - review of talk slides Speaker Grants -------------- BOB has Speaker Grants available to support speakers from groups under-represented in technology. We specifically seek women speakers, speakers of color, and speakers who are not able to attend the conference for financial reasons. Topics ------ We are looking for talks about best-of-breed software technology, e.g.: - functional programming - persistent data structures and databases - event-based modelling and architecture - "fancy types" (dependent types, gradual typing, linear types, ...) - formal methods for correctness and robustness - abstractions for concurrency and parallelism - metaprogramming - probabilistic programming - math and programming - controlled side effects - program synthesis - AI beyond chatbots, vibecoding, and agents - linked data - symbolic AI - next-generation IDEs - effective abstractions for data analytics - ... everything really that isn’t mainstream, but you think should be - ... including rough ideas that are worth discussing. Presenters should provide the audience with information that is practically useful for software developers. Challenges ---------- Furthermore, we seek contributions on successful approaches for solving hard problems, for example: - bias in machine-learning systems - digital transformation in difficult settings - accessibiltity - systems with critical reliability requirements - ecologically sustainable software development We're especially interested in experience reports. Other topics are also relevant, e.g.: - introductory talks on technical background - overviews of a given field - demos and how-tos Requirements ------------ We accept proposals for presentations of 45 minutes (40 minutes talk + 5 minutes questions), as well as 90 minute tutorials for beginners. The language of presentation should be either English or German. Your proposal should include (in your presentation language of choice): - An abstract of max. 1500 characters. - A short bio/cv - Contact information (including at least email address) - A list of 3-5 concrete ideas of how your work can be applied in a developer's daily life - additional material (websites, blogs, slides, videos of past presentations, …) Organisation ------------ - Direct questions to konferenz at bobkonf dot de - Proposal deadline: November 2, 2026 - Notification: November 23, 2026 - Program: November 30, 2026 Submit here: https://pretalx.com/bob-2027/submit/ Program Committee ----------------- (more information here: https://bobkonf.de/2027/programmkomitee.html) - Matthias Fischmann, Wire - Matthias Neubauer, SICK AG - Nicole Rauch, Softwareentwicklung und Entwicklungscoaching - Michael Sperber, Active Group - Stefan Wehr, Hochschule Offenburg Scientific Advisory Board - Annette Bieniusa, TU Kaiserslautern - Torsten Grust, Uni Tübingen - Peter Thiemann, Uni Freiburg

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Haskell.org is not feeling well
by X Y 28 Aug '26

28 Aug '26

L.S., I am trying to update the Haskellwiki; I keep getting 503 errors and one 502 error. The most recent message is: ---------------------------------------------------- Error 503 Backend is unhealthy Backend is unhealthy Error 54113 Details: cache-rtm-ehrd2290036-RTM 1787867570 777577883 Varnish cache server ---------------------------------------------------- Can someone do something about this? Regards, ಹೆಂಕ್-ಜಾನ್ ವ್ಯಾನ್ ಟುಯ್ಲ್ Henk-Jan van Tuyl

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IFL 2026 - Second call for draft papers
by Mart Lubbers 28 Aug '26

28 Aug '26

======================================================================= IFL 2026 38th Symposium on Implementation and Application of Functional Languages venue: Aspenäs Herrgård, Gothenburg, Sweden October 28 - 30 2026 https://ifl26.cse.chalmers.se/ ======================================================================= ### Scope The goal of the IFL symposia is to bring together researchers actively engaged in the implementation and application of functional and function-based programming languages. IFL 2026 will be a venue for researchers to present and discuss new ideas and concepts, work in progress, and publication-ripe results related to the implementation and application of functional languages and function-based programming. ### Topics of interest Topics of interest to IFL include, but are not limited to: - language concepts - type systems, type checking, type inferencing - compilation techniques - staged compilation - run-time function specialisation - run-time code generation - partial evaluation - (abstract) interpretation - meta-programming - generic programming - automatic program generation - array processing - concurrent/parallel programming - concurrent/parallel program execution - embedded systems - web applications - (embedded) domain specific languages - security - novel memory management techniques - run-time profiling performance measurements - debugging and tracing - virtual/abstract machine architectures - validation, verification of functional programs - tools and programming techniques ### Peer-review process Following IFL tradition, IFL 2026 will use a post-symposium review process for the formal proceedings. Authors are invited to submit draft papers before the symposium. The program chairs will screen submissions for relevance to IFL, and accepted drafts will be shared with all participants. Each accepted paper must be presented at the symposium by at least one author. If submissions exceed capacity, selection will be based on quality, maturity, and relevance. Authors of accepted presentations will have the opportunity to revise their work in response to symposium feedback and submit a full paper to the post-proceedings. These submissions will be reviewed by the program committee for correctness, novelty, originality, relevance, significance, and clarity. The post-symposium review process is single-blind, with at least three reviews per paper. Camera-ready versions may include minor revisions without further review. ### Important dates Submission of draft papers September 4, 2026 Draft papers notification September 11, 2026 Deadline for early registration September 18, 2026 Deadline for late registration September 25, 2026 IFL symposium October 28-30, 2026 Submission of papers for proceedings November 25, 2026 Notification of acceptance February 12, 2027 Camera-ready version March 12, 2027 Deadlines are end of day Anywhere on Earth (UTC-12). ### Submission details All contributions must be written in English. Papers must use the ACM two columns conference format, which can be found at: http://www.acm.org/publications/proceedings-template Submit your paper here: https://easychair.org/conferences/?conf=ifl26 Register here: https://ifl26.cse.chalmers.se/registration/ Important note to authors about the new ACM open access publishing model: ACM has introduced a new open access publishing model for the International Conference Proceedings Series (ICPS). Authors based at institutions that are not yet part of the ACM Open program and do not qualify for a waiver will be required to pay an article processing charge (APC) to publish their ICPS article in the ACM Digital Library. To determine whether or not an APC will be applicable to your article, please follow the detailed guidance here: https://www.acm.org/publications/icps/author-guidance Further information: ICPS publishing model FAQ: https://www.acm.org/publications/icps/faq ACM Open program details: https://www.acm.org/publications/openaccess Questions: icps-info(a)acm.org ### Peter Landin Prize The Peter Landin Prize is awarded to the best paper presented at the symposium every year. The honoured article is selected by the program committee based on the submissions received for the formal review process. The prize carries a cash award equivalent to 150 Euros. ### Organisation PC Chairs: - Alex Gerdes, Chalmers and University of Gothenburg, Sweden - Koen Claessen, Chalmers and University of Gothenburg, Sweden Publicity Chair: - Mart Lubbers, Radboud University, The Netherlands Local Chairs: - Alex Gerdes, Chalmers and University of Gothenburg, Sweden - Koen Claessen, Chalmers and University of Gothenburg, Sweden Please direct any questions you may have towards alexg(a)chalmers.se. ### Program committee - Abhiroop Sarkar, ETH Zurich - Andres Löh, Well-Typed LLP - Daan Leijen, Microsoft - Dominic Orchard, University of Kent - Fritz Henglein, DIKU - Graham Hutton, University of Nottingham - Guillaume Allais, University of Strathclyde - Jesper Cockx, Delft University of Technology - Mart Lubbers, Radboud University - Nachiappan Valliappan, University of Edinburgh - Nicolas Wu, Imperial College London - Niki Vazou, IMDEA Software Institute The program committee is still being finalized and may be updated. ### Venue IFL 2026 will be held at Aspenäs Herrgård, just outside Gothenburg, Sweden. Aspenäs Herrgård is a residential conference center by Lake Aspen in Lerum, approximately 20 minutes from central Gothenburg. See the website for more information: https://ifl26.cse.chalmers.se/venue/ ### Acknowledgments This call-for-papers is an adaptation and evolution of content from previous instances of IFL. We are grateful to prior organisers for their work, which is reused here.

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LEFUNK 2026 (Leipzig, Germany, September 29-30) - register now
by Johannes Waldmann 24 Aug '26

24 Aug '26

register now for: Leipziger Workshop Funktionale Programmierung, September 29-30 https://www.imn.htwk-leipzig.de/LFUNK2026/ program includes talks, tutorials, and music live coding performances. we are looking for sponsors: buy extra “industry tickets” and advertise your company at the workshop. - J.W.

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like "deriving Read" but faster?
by Johannes Waldmann 22 Aug '26

22 Aug '26

Dear Cafe, I could use a parser that is equivalent to the one produced by "deriving Read" but ... A) faster, and using less space (Data.Text(.Lazy) instead of String) B) streaming (parse a long list literal "[0,1,2, ... ]" in constant space, produce the first cons of the result right after reading "[0") C) with some minimal error reporting (e.g., some prefix of not-consumed input) perhaps attoparsec with some form of early-commited choice? I do have something (only for A) at https://codeberg.org/jwaldmann/text-read (attoparsec on lazy text) and it seems twice as fast as "deriving Read" in my tests. NB: I was quite shocked to see that "deriving Read" accepts "Just Foo { foo = 42 }" (no parentheses around the record literal) (while "deriving Show" produces them). - J.W.

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HExpat
by Ivan Perez 19 Aug '26

19 Aug '26

Hi, Does anyone have a valid email address to contact a current maintainer of HExpat? https://hackage.haskell.org/package/hexpat The ones I tried (including the one listed on the package page on Hackage) all bounced. Thanks, Ivan

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Accessing haskell.org returns 503 errors
by Ivan Perez 19 Aug '26

19 Aug '26

Hi, I just tried to access https://wiki.haskell.org/Base_package and got the following messages: Error 503 Backend is unhealthy and Error 503 first byte timeout It also happens when I try to access https://downloads.haskell.org/ghc/latest/docs/users_guide/. Ivan

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Errors downloading packages from Hackage in CI job on Github
by Ivan Perez 16 Aug '26

16 Aug '26

Hi, My Github actions have been failing all day with messages like: Unexpected response 404for http://objects-us-east-1.dream.io/hackage-mirror/package/StateVar-1.2.2.tar… Error: Process completed with exit code 1. It's not always the same package. If I keep insisting, they may eventually succeed, but it can take dozens of attempts over several hours. Is this a problem of Github or Hackage? Thanks, Ivan

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