October 2025 - Haskell-Cafe

GHC Steering Committee Call for Nominations
by Simon Marlow 07 Nov '25

07 Nov '25

Dear Haskellers, The GHC Steering Committee is seeking nominations for new members. *To nominate yourself *please send an email to Simon Marlow <marlowsd(a)gmail.com> <marlowsd(a)gmail.com>, briefly summarising your background and relevant experience. See below for details on what committee membership involves, and what kind of experience would be useful. DEADLINE: 6 November 2025 *What's the GHC steering committee?* The committee scrutinizes, debates and eventually decides to accept or reject proposals to change the language or major features supported by GHC. Our processes are described in the GitHub repository <https://github.com/ghc-proposals/ghc-proposals> where proposals are submitted. In particular, please have a look at the Committee bylaws <https://github.com/ghc-proposals/ghc-proposals/blob/master/committee.rst>. *Who are we looking for?* We are looking for members who have the ability to: - understand GHC proposals (e.g. for new language extensions), - find holes and missing corner cases in the specifications, - foresee the interaction with other language or compiler features, - comment constructively and improve proposals through engagement with others, - judge the cost/benefit ratio of changes, and - come to a justifiable conclusion. Ideally, committee members should: - have substantial experience of writing or teaching Haskell; - have a track record of active contributions to the Haskell community; or - have expertise in language design and implementation, in either Haskell or related languages. It is our aim that this committee be diverse; by representing different viewpoints, we will make decisions that benefit larger segments of our community. Even if you are uncertain whether your background qualifies you for the role, you are warmly encouraged to apply. The committee's work requires a small, but non-trivial amount of time, especially when you are assigned a proposal for shepherding. We estimate the workload to be around 2 hours per week, and our process works best if members usually respond to technical emails within 1-2 weeks (within days is even better). Please keep that in mind if your email inbox is already overflowing. Committee members serve for 3 years, but are free to re-nominate themselves when their 3-year term expires. Self-nominations are the norm. You can nominate someone else, but please obtain their explicit consent to do so. (We don't want to choose someone who turns out to be unable to serve.) *What happens after nominations?* In accordance with our Committee bylaws <https://github.com/ghc-proposals/ghc-proposals/blob/master/committee.rst>, the committee deliberates nominations *in private* before communicating the decision. The committee doesn't have a fixed size, although we like to have a minimum of 9 members. There are currently two members rotating off, but as the committee currently has 10 members, we will be looking to appoint at least one but possibly (hopefully!) more. On behalf of the committee, Simon Marlow

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Jeremy Avigad to give this year's LMS/BCS-FACS Evening Seminar -- 6 November 2025, online via Zoom
by Andrei Popescu 03 Nov '25

03 Nov '25

Dear Colleagues, I am delighted to announce that this year’s London Mathematical Society (LMS) / British Computer Society -- Formal Aspects of Computing Science (BCS-FACS) Evening Seminar will feature Jeremy Avigad as the distinguished speaker. Registration is free but required in advance. Date: 6 November 2025 Time: 19:00 (UK time) Format: Online via Zoom Talk title: Mathematics in the Age of AI Jeremy’s website: https://lnkd.in/ep3w-fiB Registration (for access to the Zoom link) is available here: https://lnkd.in/eRE-Bb2A Further details about the talk are included below Best wishes, Andrei Speaker: Jeremy Avigad (Carnegie Mellon University) Title: Mathematics in the Age of AI Abstract: New technologies for reasoning and discovery are bound to have a profound effect on mathematical practice. Proof assistants are already changing the nature of collaboration, communication, and curation of mathematical knowledge. Automated reasoning tools are used to find mathematical objects with specified properties or rule out their existence, and to decide or verify mathematical claims. Machine learning and neural methods can discover patterns in mathematical data, explore complex mathematical spaces, and generate mathematical objects of interest. Neurosymbolic theorem provers, now capable of solving the most challenging competition problems, combine aspects of all of these technologies. It is helpful to keep in mind that the phrase "AI for mathematics" encompasses several distinct technologies that overlap and interact in interesting ways. In this talk, I will survey the landscape, describe a few landmark applications to mathematics, and encourage you to join me in thinking about how mathematicians and computer scientists can collaborate to guide mathematics through this era of technological change. Bio: Jeremy Avigad is a professor in the Department of Philosophy and the Department of Mathematical Sciences at Carnegie Mellon University. He is the director of the Institute for Computer-Aided Reasoning in Mathematics, a new NSF Mathematical Sciences Research Institute, and the director of the Hoskinson Center for Formal Mathematics, a research center at Carnegie Mellon. He has contributed to mathematical logic and the history and philosophy of mathematics, and he is currently working on applications of formal methods and AI to mathematics. He serves on the Lean Community Admin Team and the board of the Lean Focused Research Organization.

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POPL 2026 Call for Participation - Early registration: 12 December
by Ningning Xie 31 Oct '25

31 Oct '25

======================================= Call for Participation ACM SIGPLAN Symposium on Principles of Programming Languages (POPL 2026) January 11-17, 2026, Rennes, France. https://popl26.sigplan.org/ ======================================= - Early registration deadline: ** 12 December 2025 ** - Register here: https://popl26.sigplan.org/attending/registration ======================================= The 53rd ACM SIGPLAN Symposium on Principles of Programming Languages (POPL 2026) is a forum for the discussion of all aspects of programming languages and programming systems. Location: le Couvent des Jacobins, 20 place Saint-Anne, 35000 Rennes, France Dates: - Main conference: Wed 14 - Fri 16 January - Workshops, tutorials, co-located events: Sun 11, Mon 12, Tue 13 and Sat 17 January Full details of the conference and co-located events: https: // popl26.sigplan.org/

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2nd Call for Contributions: BOB 2026 (Berlin, March 13 - Deadline Nov 17)
by Michael Sperber 31 Oct '25

31 Oct '25

Haskell is always big at BOB - send us your best! ================================================================================ BOB Conference 2026 "What happens when we use what's best for a change?" https://bobkonf.de/2026/cfc.html Berlin, Mar 13 Call for Contributions Deadline: November 17, 2025 ================================================================================ 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 vibecoding and chatbots - 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 17, 2025 - Notification: December 5, 2025 - Program: December 12, 2025 Submit here: https://pretalx.com/bob-2026/submit/ Program Committee ----------------- (more information here: https://bobkonf.de/2026/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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[TFP 2026] 2nd Call for Papers for the 27th International Symposium on Trends in Functional Programming, Odense, Denmark, January 27-30 2026
by Peter Achten 30 Oct '25

30 Oct '25

# TFP 2026 - Second Call for Papers (trendsfp.github.io) ## Important Dates Submission deadline (pre-symposium, full papers): Thu 13th Nov 2025 (AOE) Notification (pre-symposium, full papers): Thu 11th Dec 2025 Submission deadline (pre-symposium draft papers): Thu 11th Dec 2025 (AOE) Notification (pre-symposium draft papers): Fri 19th Dec 2025 Symposium: Tue 27th Jan - Thu 30th Jan 2026 (TFPiE 26th Jan 2025) Submission deadline (post-symposium review): Thu 5th Mar 2026 (AOE) Notification (post-symposium submissions): Thu 16th Apr 2026 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 at the University of Southern Denmark, in Odense, Denmark. 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, 13th November, 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, 11th December, 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, 5th March. ## 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 chair, Casper Bach. ## 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. ## Student and Early Career Scholarships Our sponsors have generously offered to fund seven scholarships of DKK 3000 (approximately USD 460) to cover expenses in connection with traveling to and staying in Denmark in connection with the conference. Information on how to apply for these scholarships will be available soon on https://trendsfp.github.io/ ## Instructions to Authors Submission is via HotCRP: https://tfp26.hotcrp.com/ 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 Casper Bach University of Southern Denmark, DK Programme Chair Jeremy Gibbons University of Oxford, UK General Chair Jason Hemann Seton Hall University, US Conference Chair Peter Achten Radboud University Nijmegen, NL Publicity Chair Marco T. Morazán Seton Hall University, US Steering Committee Chair ## Programme Committee Alex Gerdes University of Gothenburg and Chalmers, SE Ben Greenman University of Utah, US Bruno Oliveira University of Hong Kong, HK Cas van der Rest Shielded Technologies, NL Cristina Matache University of Edinburgh, UK Eric Van Wyk University of Minnesota, US Jeremy Yallop University of Cambridge, UK Jules Jacobs Cornell University, US Mart Lubbers Radboud University, NL Max S. New University of Michigan, US Nicolas Wu Imperial College London, UK Patrick Bahr IT University of Copenhagen, DK Matthew Lutze Aarhus University, DK Dylan McDermott University of Oxford, UK Andrew Tolmach Portland State University, US Di Wang Peking University, CN Jesper Cockx Delft University of Technology, NL Jan de Muijnck-Hughes Strathclyde, UK

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Fwd: [TYPES/announce] PLMW@POPL 26 Call for scholarship applications
by Haniel Barbosa 29 Oct '25

29 Oct '25

Fcc: /home/hbarbosa/Mail/ufmg/Sent/cur/1761756249.051868f6e32d5522.eru:2,S Date: Wed, 29 Oct 2025 12:40:49 -0400 References: <4b4fe1d8-dccf-4ddc-9aca-a3c136732286(a)di.ku.dk> <87cy7pmbfp.fsf(a)dcc.ufmg.br> <GVYP280MB1497071010E4C6D0A56BED70DA11A(a)GVYP280MB1497.SWEP280.PROD.OUTLOOK.COM> <GVYP280MB14974DB42BBA384BCE1B9E9FDA11A(a)GVYP280MB1497.SWEP280.PROD.OUTLOOK.COM> <87wm4g4av6.fsf(a)dcc.ufmg.br> <87frb2iqrh.fsf(a)dcc.ufmg.br> <CAFUr5pEvrMNGOn3YoohG0=8bXdqZCqnKOtmrMF1SJ5CCVh762w(a)mail.gmail.com> User-Agent: mu4e 1.12.1; emacs 30.2 https://urldefense.com/v3/__https://popl26.sigplan.org/home/PLMW-POPL-2026_… https://urldefense.com/v3/__https://docs.google.com/forms/d/e/1FAIpQLSfv8Hu… Organisers: https://hanielbarbosa.com/ FYI Além de uma ótima oportunidade, casaria bem com facilitar financiamento pra CPP/VMCAI de acordo com as submissões de pessoas. Abraço, ------------------- Start of forwarded message -------------------- [ The Types Forum (announcements only), http://lists.seas.upenn.edu/mailman/listinfo/types-announce ] CALL FOR SCHOLARSHIP APPLICATIONS PLMW @ POPL 26 (Deadline: November 10) ACM SIGPLAN Programming Languages Mentoring Workshop, Rennes, France Tuesday, January 13, 2016, Co-located with POPL 2026 Following the success of the first thirteen Programming Languages Mentoring Workshops at POPL 2012-2025, we are pleased to announce the 14th SIGPLAN Programming Languages Mentoring Workshop (PLMW), co-located with POPL 2026. The workshop will take place in person in Rennes, France. PLMW aims to encourage graduate students and senior undergraduate students to pursue careers in programming language (PL) research. This workshop will bring together world leaders in PL research and teaching from both academia and industry to provide (a) technical sessions on cutting-edge PL research and (b) mentoring sessions on how to prepare for a research career. The workshop will help students imagine how they might contribute to our vibrant and thriving research community. We especially encourage women, members of underrepresented minorities, and people with disabilities to attend PLMW. This workshop is part of the activities surrounding POPL, the Symposium on Principles of Programming Languages, and takes place the day before the main conference. One goal of the workshop is to make the POPL conference more accessible to newcomers. We hope that participants will stay for the whole conference. Our sponsors have generously donated scholarship funds for qualified students who do not have the funds to attend PLMW. These scholarships can cover expenses (airfare, hotel, and registration fees) for attendance at both the workshop and the POPL conference itself. Note that you do not need to apply here if you just want to attend PLMW: Attendance is open to everybody who is registered to workshops for the day. We strongly recommend to also apply for student volunteering at POPL if possible. Application deadline: November 10 2025 AoE Scholarship Application Form: Yannick Forster <yannick.forster(a)inria.fr> Andrew Hirsch <akhirsch(a)buffalo.edu> Jenna DiVincenzo <jennad(a)purdue.edu> -------------------- End of forwarded message -------------------- -- Haniel Barbosa

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PLMW@POPL 26 Call for scholarship applications
by Ningning Xie 29 Oct '25

29 Oct '25

CALL FOR SCHOLARSHIP APPLICATIONS PLMW @ POPL 26 (Deadline: November 10) ACM SIGPLAN Programming Languages Mentoring Workshop, Rennes, France Tuesday, January 13, 2016, Co-located with POPL 2026 https://popl26.sigplan.org/home/PLMW-POPL-2026 Following the success of the first thirteen Programming Languages Mentoring Workshops at POPL 2012-2025, we are pleased to announce the 14th SIGPLAN Programming Languages Mentoring Workshop (PLMW), co-located with POPL 2026. The workshop will take place in person in Rennes, France. PLMW aims to encourage graduate students and senior undergraduate students to pursue careers in programming language (PL) research. This workshop will bring together world leaders in PL research and teaching from both academia and industry to provide (a) technical sessions on cutting-edge PL research and (b) mentoring sessions on how to prepare for a research career. The workshop will help students imagine how they might contribute to our vibrant and thriving research community. We especially encourage women, members of underrepresented minorities, and people with disabilities to attend PLMW. This workshop is part of the activities surrounding POPL, the Symposium on Principles of Programming Languages, and takes place the day before the main conference. One goal of the workshop is to make the POPL conference more accessible to newcomers. We hope that participants will stay for the whole conference. Our sponsors have generously donated scholarship funds for qualified students who do not have the funds to attend PLMW. These scholarships can cover expenses (airfare, hotel, and registration fees) for attendance at both the workshop and the POPL conference itself. Note that you do not need to apply here if you just want to attend PLMW: Attendance is open to everybody who is registered to workshops for the day. We strongly recommend to also apply for student volunteering at POPL if possible. Application deadline: November 10 2025 AoE Scholarship Application Form: https://docs.google.com/forms/d/e/1FAIpQLSfv8HuJpgsjso6_D_CZtp5AD17HPu2JTLW… Organisers: Yannick Forster <yannick.forster(a)inria.fr> Andrew Hirsch <akhirsch(a)buffalo.edu> Jenna DiVincenzo <jennad(a)purdue.edu>

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[ANNOUNCE] Ajla 0.3.0 with formal verification using Z3
by Mikulas Patocka 28 Oct '25

28 Oct '25

Hi I announce a new release of a purely functional programming language Ajla 0.3.0 - https://www.ajla-lang.cz/ It has a new feature - the capability to formally verify programs using the Z3 library - see https://www.ajla-lang.cz/tutorial.html#verifying_ajla_programs_with_z3 Mikulas

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GHC 9.12.3 status update
by Zubin Duggal 28 Oct '25

28 Oct '25

Hi all, I'm currently working on the final set of backports for GHC 9.12.3-rc2. This has been delayed due to #26166 making bootstrapping GHC impossible on the new macOS release. I am currently in the process of backporting the fix for this ticket (among a few other patches) to GHC 9.12. I expect to have rc2 out in the next few days, by the end of this week. Cheers, Zubin. #26166: https://gitlab.haskell.org/ghc/ghc/-/issues/26166

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Adding `reverse` and `sortBy` to `Traversable`
by Keith 27 Oct '25

27 Oct '25

Folks[1] have known for a long time that `reverse` and `sortBy` can both be implemented in terms of `mapAccumL`. Would it make sense to add those to `Data.Traversable` as functions or methods? [1] For example, Will Fancher wrote about it in 2017. --- Sent from my phone with K-9 Mail.

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