September 2025 - Haskell-Cafe

TFPIE 2026 - Call for Papers
by Mart Lubbers 29 Sep '25

29 Sep '25

TFPIE 2026 Call for papers https://wiki.tfpie.science.ru.nl/TFPIE2026 (January 26th 2026, Odense, Denmark, co-located with TFP 2026 at University of Southern Denmark) TFPIE 2026 welcomes submissions describing techniques used in the classroom, tools used in and/or developed for the classroom and any creative use of functional programming (FP) to aid education in or outside Computer Science. Topics of interest include, but are not limited to: - FP and beginning CS students - FP and Computational Thinking - FP and Artificial Intelligence - FP in Robotics - FP and Music - Advanced FP for undergraduates - FP in graduate education - Engaging students in research using FP - FP in Programming Languages - FP in the high school curriculum - FP as a stepping stone to other CS topics - FP and Philosophy - The pedagogy of teaching FP - FP and e-learning: MOOCs, automated assessment etc. - Best Lectures - more details below In addition to papers, we are requesting best lecture presentations. What's your best lecture topic in an FP related course? Do you have a fun way to present FP concepts to novices or perhaps an especially interesting presentation of a difficult topic? In either case, please consider sharing it. Best lecture topics will be selected for presentation based on a short abstract describing the lecture and its interest to TFPIE attendees. The length of the presentation should be comparable to that of a paper. In addition, the speaker can provide commentary on effectiveness or student feedback. ## Submissions Potential presenters are invited to submit an extended abstract (4-6 pages) or a draft paper (up to 20 pages) in EPTCS style. The authors of accepted presentations will have their preprints and their slides made available on the workshop's website. Papers and abstracts can be submitted via easychair at the following link: https://easychair.org/conferences/?conf=tfpie2026 After the workshop, presenters are invited to submit (a revised version of) their article for the formal review. The PC will select the best articles for publication in the Electronic Proceedings in Theoretical Computer Science (EPTCS). Articles rejected for presentation and extended abstracts will not be formally reviewed by the PC. ## Important Dates Submission deadline: December 26th 2023, Anywhere on Earth Notification: by December 30th 2023 (Note: submissions will be evaluated on a rolling basis, so earlier submissions will receive an earlier response) TFPIE Registration Deadline: Workshop: January 26th 2026 Submission for formal review: April 22nd 2026, Anywhere on Earth Notification of full article: May 27th 2026 Camera ready: June 24th 202 ## Program Committee Mart Lubbers, Radboud University, Nijmegen, Netherlands (PC Chair) Tim Steenvoorden, Open Universitei, Heerlen, Netherlands Marco T. Morazán, Seton Hall University, South Orange, NJ, USA Guannan Wei, Tufts University, Medford, MA, USA Marcos Viera, Universidad de la República, Montevideo, Uruguay Johannes Åman Pohjola, Chalmers University of Technology, Götenburg, Sweden ## Registration information See https://wiki.tfpie.science.ru.nl/TFPIE2026 for updated information. Registration and attendance are mandatory for at least one author of every paper that is presented at the workshop. Only papers that have been presented at TFPIE may be submitted to the post-reviewing process.

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[TFP 2026] Call for Papers for the 27th International Symposium on Trends in Functional Programming, Odense, Denmark, January 2026
by Peter Achten 22 Sep '25

22 Sep '25

# TFP 2026 -- 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 * 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, 19th February. ## 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. ## 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). See below for more details. Submission is single-blind. Submissions are welcome from PC members (except the chair). Accepted papers from the pre-symposium and post-symposium formal review will appear in a formal proceedings, published by Springer. 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…) ### 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. ## Organizing Committee | Casper Bach | University of Southern Denmark, DK | Programme Chair | | Jeremy Gibbons | University of Oxford | General 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 | | Andrew Tolmach | Portland State University, US | | 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 | | Di Wang | Peking University, CN | | Dylan McDermott | University of Oxford, UK | | Eric Van Wyk | University of Minnesota, US | | Jan de Muijnck-Hughe | Strathclyde, UK | | Jeremy Yallop | University of Cambridge, UK | | Jesper Cockx | Delft University of Technology, NL | | Jules Jacobs | Cornell University, US | | Mart Lubbers | Radboud University, NL | | Matthew Lutze | Aarhus University, DK | | Max S. New | University of Michigan, US | | Nicolas Wu | Imperial College London, UK | | Patrick Bahr | IT University of Copenhagen, DK |

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GHC 9.12.3-rc1 is now available
by Zubin Duggal 22 Sep '25

22 Sep '25

The GHC developers are very pleased to announce the availability of the release candidate for GHC 9.12.3. Binary distributions, source distributions, and documentation are available at [downloads.haskell.org][] and via [GHCup](https://www.haskell.org/ghcup/). GHC 9.12.3 is a bug-fix release fixing several issues of a variety of severities and scopes. A full accounting of these fixes can be found in the [release notes][]. As always, GHC's release status, including planned future releases, can be found on the GHC Wiki [status][]. This release candidate will have a two-week testing period. If all goes well the final release will be available the week of 2 October 2025. We would like to thank Well-Typed, Tweag I/O, Juspay, QBayLogic, Channable, Serokell, SimSpace, the Haskell Foundation, and other anonymous contributors whose on-going financial and in-kind support has facilitated GHC maintenance and release management over the years. Finally, this release would not have been possible without the hundreds of open-source contributors whose work comprise this release. As always, do give this release a try and open a [ticket][] if you see anything amiss. [release notes]: https://gitlab.haskell.org/ghc/ghc/-/blob/ghc-9.12/docs/users_guide/9.12.3-… [status]: https://gitlab.haskell.org/ghc/ghc/-/wikis/GHC-status [downloads.haskell.org] https://downloads.haskell.org/ghc/9.12.3-rc1 [ticket]: https://gitlab.haskell.org/ghc/ghc/-/issues/new

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Haskell Symposium 2025 Last Call for Talks (deadline Sept 15th)
by Ningning Xie 14 Sep '25

14 Sep '25

======================================================== Haskell Symposium 2025 Call for Talks Thu 16 - Fri 17 Oct 2025, Singapore https://conf.researchr.org/home/icfp-splash-2025/haskellsymp-2025 ======================================================== The ACM SIGPLAN Haskell Symposium 2025 will be co-located with the 2025 International Conference on Functional Programming (ICFP) and the 2025 International Conference on Systems, Programming, Languages and Applications: Software for Humanity (SPLASH). The Haskell Symposium presents original research on Haskell, discusses practical experience and future development of the language, and promotes other forms of declarative programming. We invite proposals from potential speakers for talks. Talk proposals should report work in progress relevant to Haskell language design, theory, tools, or applications. Talks are proposed by submitting an abstract. Please submit a talk title and abstract of no more than 300 words. There will be no published proceedings. Papers should be submitted through HotCRP at: https://haskell25.hotcrp.com/ Submission deadline: 15 September 2025 (Mon) Deadlines are valid anywhere on Earth. Talk proposals will go through a lightweight reviewing process, evaluated by the PC for relevance to the Haskell community, but are not expected to include finished results. Talk proposals will not be distributed to attendees, but authors of talk proposals may provide links to materials to be included on the program. Topics of interest include: * Language design, with a focus on possible extensions and modifications of Haskell as well as critical discussions of the status quo; * Theory, such as formal semantics of the present language or future extensions, type systems, effects, metatheory, and foundations for program analysis and transformation; * Implementations, including program analysis and transformation, static and dynamic compilation for sequential, parallel, and distributed architectures, memory management, as well as foreign function and component interfaces; * Libraries, that demonstrate new ideas or techniques for functional programming in Haskell; * Tools, such as profilers, tracers, debuggers, preprocessors, and testing tools; * Applications, to scientific and symbolic computing, databases, multimedia, telecommunication, the web, and so forth; * Experience Reports, to document general practice and experience in education, industry, or other contexts; * System Demonstrations, based on running software rather than novel research results.

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[Call for participation]: North American Haskell Hackathon in New York
by Jose Calderon 13 Sep '25

13 Sep '25

Hello Haskell Cafe, The Haskell Foundation is proud to announce the inaugural AmeriHac, a two day haskell hackathon, with this iteration being in New York City! Jane Street has kindly offered to host the Haskell Foundation’s first North American Haskell event. The event will take place on Feb 7th and Feb 8th 2026 within Jane Street’s New York premises (https://maps.app.goo.gl/eHweQfEGkRJiYkct6) Registration will be free, thanks to Jane Street’s generosity as hosts. ## Organization Much like ZuriHac, there will be dedicated space for specific projects (GHC, cabal, stack, etc.), with the full details being determined by registrant interest. The webpage, https://haskell.foundation/events/2026-amerihac.html, will be updated with more information as we finalize keynote speakers and the schedule. ## Summary: - Who: Haskell Foundation and Jane Street - What: Weekend Haskell hackathon - Where: Jane Street NYC (https://maps.app.goo.gl/eHweQfEGkRJiYkct6) Register here: https://forms.gle/3dZvn3VAvwa3JgJK8 We look forward to seeing you there! -Jose

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GHC 9.10.3 is now available
by Zubin Duggal 11 Sep '25

11 Sep '25

The GHC developers are very pleased to announce the availability of the final release for GHC 9.10.3. Binary distributions, source distributions, and documentation are available at [downloads.haskell.org][]. GHC 9.10.3 is a bug-fix release fixing many issues of a variety of severities and scopes, including: * Fix a number of crashes in the compiler frontend (#25960, #25004, #25056) * Fix incorrect results in the NCG (#25601, #26061) * Support for far jumps in the AArch64 NCG (#24648) * A fix for a segfault in the RTS when running certain code involving STM (#26205) * And many more! A full accounting of these fixes can be found in the [release notes][]. As always, GHC's release status, including planned future releases, can be found on the GHC Wiki [status][]. We would like to thank Well-Typed, Tweag I/O, Juspay, QBayLogic, Channable, Serokell, SimSpace, the Haskell Foundation, and other anonymous contributors whose on-going financial and in-kind support has facilitated GHC maintenance and release management over the years. Finally, this release would not have been possible without the hundreds of open-source contributors whose work comprise this release. As always, do give this release a try and open a [ticket][] if you see anything amiss. [release notes]: https://downloads.haskell.org/~ghc/9.10.3/docs/users_guide/9.10.3-notes.html [status]: https://gitlab.haskell.org/ghc/ghc/-/wikis/GHC-status [downloads.haskell.org] https://downloads.haskell.org/ghc/9.10.3 [ticket]: https://gitlab.haskell.org/ghc/ghc/-/issues/new

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CGO 2026 - Call For Tutorials
by Luisa Cicolini 10 Sep '25

10 Sep '25

Dear all, This is a reminder that only one week is left to submit tutorial proposals<https://2026.cgo.org/track/cgo-2026-workshops-and-tutorials> for CGO 2026 (deadline 17th September). The International Symposium on Code Generation and Optimization (CGO) provides a premier venue to bring together researchers and practitioners working at the interface of hardware and software on a wide range of optimization and code generation techniques and related issues. The conference spans the spectrum from purely static to fully dynamic approaches, and from pure software-based methods to specific architectural features and support for code generation and optimization. CGO will be held in Sydney, Australia from 31st January – 4th February 2026 and tutorials (half- or full-day) will be held before the main conference. Best, Luisa

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[ANN] Copilot 4.5.1
by Ivan Perez 09 Sep '25

09 Sep '25

Hi everyone!! We are really excited to announce Copilot 4.5.1 [1,2]. Copilot is a stream-based EDSL in Haskell for writing and monitoring embedded C programs, with an emphasis on correctness and hard realtime requirements. Copilot is typically used as a high-level runtime verification framework, and supports temporal logic (LTL, PTLTL and MTL), clocks and voting algorithms. Compilation to Bluespec, to target FPGAs, is also supported. Copilot is NASA Class D open-source software, and is being used at NASA in drone test flights. Through the NASA tool Ogma [3] (also written in Haskell), Copilot also serves as a programming language and runtime framework for NASA's Core Flight System, Robot Operating System (ROS2), FPrime (the software framework used in the Mars Helicopter). Ogma now supports producing flight and robotics applications directly in Copilot, not just for monitoring, but for implementing the logic of the applications themselves. Since the last announcement, the major updates and improvements are: - Copilot maintream now includes the verification, FPGA and visualization backends. - Copilot now includes a tutorial showing how to generate code for FPGA and run it (thanks to Sukhman Kahlon!). - Compatibility with newer versions of dependencies has been extended. - Cleaning efforts in `copilot-theorem`, and `copilot-core`. A picture of the Copilot visualizer can be seen at [5]. The new implementation is compatible with versions of GHC from 8.6 to 9.12. This release has been made possible thanks to key submissions from Sukhman Kahlon (NASA). We also thank Corey Carter (NASA), Ryan Scott (Galois) and Kaveh Zare (NASA) for their input. We are grateful to them for their contributions, and for making Copilot better every day. For details on this release, see [1]. As always, we're releasing exactly 2 months since the last release. Our next release is scheduled for Nov 7th, 2025. We want to remind the community that Copilot is now accepting code contributions from external participants again. Please see the discussions and the issues in our github repo [4] to learn how to participate. Current emphasis is on using Copilot for full data processing applications (e.g, system control, arduinos, rovers, drones), improving usability, performance, and stability, increasing test coverage, removing unnecessary dependencies, hiding internal definitions, and formatting the code to meet our coding standards. Users are encouraged to participate by opening issues, asking questions, extending the implementation, and sending bug fixes. Happy Haskelling! Ivan -- [1] https://github.com/Copilot-Language/copilot/releases/tag/v4.5.1 [2] https://hackage.haskell.org/package/copilot [3] https://github.com/nasa/ogma [4] https://github.com/Copilot-Language/copilot [5] https://www.reddit.com/r/haskell/comments/1nci0u6/ann_copilot_451/

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IFL2025 Call for Participation
by Mart Lubbers 05 Sep '25

05 Sep '25

========================================================== Call for Participation IFL 2025 37th Symposium on Implementation and Application of Functional Languages Montevideo, Uruguay October 1-3, 2025 (Tutorials September 29-30) https://www.fing.edu.uy/inco/congresos/ifl2025 ========================================================== 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 2025 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. ### Registration The registration fee covers use of facilities, participation in the tutorials and symposium, lunches, coffee breaks, social outing, symposium dinner and access to draft proceedings. Early Bird Registration Deadline is Sep 5, 2025. https://www.fing.edu.uy/inco/congresos/ifl2025/register.html If you choose online payment at registration, you will receive payment instructions during the week. ### Keynote speakers Roberto Ierusalimschy Departamento de Informática, PUC-Rio, Río de Janeiro, Brazil Functions in Lua Iván Pérez NASA Ames Research Center, California, USA Making Haskell Fly https://www.fing.edu.uy/inco/congresos/ifl2025/keynotes.html ### Tutorials On September 29 and 30, the two days prior to the symposium, four tutorials will be held: Gradual typing Éric Tanter, University of Chile, Chile Type Based Static Analysis Jurriaan Hage, Heriot-Watt University, UK Development of dApps in the UTxO model TxPipe, Argentina Programming-Based Automata Theory Marco T. Morazán, Seton Hall University, USA https://www.fing.edu.uy/inco/congresos/ifl2025/tutorials.html ### Accepted Papers Regular Papers: Compilation of the Stochastic Language ALEA, Baltasar Trancón Y Widemann and Markus Lepper. Design and Implementation of DSLs for Unit Testing, Marco T. Morazán and Andres Garced. Recipe-Based Errors: Methodology, Implementation, and Evaluation, Marco T. Morazán, Shamil Dzhatdoyev, Josephine Des Rosiers, Rose Bohrer, Andres Garced and David Anthony Fields. Refinement-Types Driven Development: A study, Facundo Domínguez and Arnaud Spiwack. Draft Papers: AI-Assisted Program Design Using Structural Recursion, Marco T. Morazán. A Quantum-Control Lambda-Calculus with Multiple Measurement Bases, Nicolas A. Monzon and Alejandro Díaz-Caro. Automatic Testing for Finite-State Machines, Marco T. Morazán, Sophia G. Turano, Andres Garced and David Anthony Fields. Closures in a Higher-Order Polymorphic DSL for GPU programming, Andre Rauber Du Bois, Henrique Gabriel Rodrigues and Rodrigo Geraldo Ribeiro. Energy-aware Data-Parallel Functional Array Processing for Heterogeneous Platforms, Clemens Grelck. Formalizating System I with type Top in Agda, Agustín Séttimo, Cristian Sottile and Cecilia Manzino. Foundations of Gradual Abstract Interpretation, Gaspar Ricci, Sebastian Erdweg, Éric Tanter and Matías Toro. Heuristics-based Type Error Diagnosis for Haskell: the case of type families, Niels Kwadijk and Jurriaan Hage. Higher-ranked region inference for polymorphic, lazy languages, Ivo Gabe de Wolff and Jurriaan Hage. Improving a Group Membership Protocol Implementation using Liquid Haskell and QuickCheck, Jianhao Li and Viktoria Zsok. List Fold Operators in Dafny, Juan Michelini, Nora Szasz and Alvaro Tasistro. Reducibility candidates modulo isomorphisms, Cristian Sottile and Alejandro Díaz-Caro. Type Checking Dependently Sorted Nominal Signatures, Maribel Fernandez, Miguel Pagano, Nora Szasz and Alvaro Tasistro. Unrestricted Grammar Design and Visualization: A Design Recipe and Dynamic Visualization Tool, Marco T. Morazán, Andres Garced and Tijana Minić.

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Haskell Symposium 2025 Call for Talks (deadline Sept 15th)
by Ningning Xie 02 Sep '25

02 Sep '25

======================================================== Haskell Symposium 2025 Call for Talks Thu 16 - Fri 17 Oct 2025, Singapore https://conf.researchr.org/home/icfp-splash-2025/haskellsymp-2025 ======================================================== The ACM SIGPLAN Haskell Symposium 2025 will be co-located with the 2025 International Conference on Functional Programming (ICFP) and the 2025 International Conference on Systems, Programming, Languages and Applications: Software for Humanity (SPLASH). The Haskell Symposium presents original research on Haskell, discusses practical experience and future development of the language, and promotes other forms of declarative programming. We invite proposals from potential speakers for talks. Talk proposals should report work in progress relevant to Haskell language design, theory, tools, or applications. Talks are proposed by submitting an abstract. Please submit a talk title and abstract of no more than 300 words. There will be no published proceedings. Papers should be submitted through HotCRP at: https://haskell25.hotcrp.com/ Submission deadline: 15 September 2025 (Mon) Deadlines are valid anywhere on Earth. Talk proposals will go through a lightweight reviewing process, evaluated by the PC for relevance to the Haskell community, but are not expected to include finished results. Talk proposals will not be distributed to attendees, but authors of talk proposals may provide links to materials to be included on the program. Topics of interest include: * Language design, with a focus on possible extensions and modifications of Haskell as well as critical discussions of the status quo; * Theory, such as formal semantics of the present language or future extensions, type systems, effects, metatheory, and foundations for program analysis and transformation; * Implementations, including program analysis and transformation, static and dynamic compilation for sequential, parallel, and distributed architectures, memory management, as well as foreign function and component interfaces; * Libraries, that demonstrate new ideas or techniques for functional programming in Haskell; * Tools, such as profilers, tracers, debuggers, preprocessors, and testing tools; * Applications, to scientific and symbolic computing, databases, multimedia, telecommunication, the web, and so forth; * Experience Reports, to document general practice and experience in education, industry, or other contexts; * System Demonstrations, based on running software rather than novel research results.

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