Haskell Weekly

Newsletter

Issue 536 2026-08-06

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Welcome to another issue of Haskell Weekly! Haskell is a safe, purely functional programming language with a fast, concurrent runtime. This is a weekly summary of what’s going on in its community.

Featured

  • A Revised Haskell 2010 Language Report by David Binder

    Many members of our community express some pessimism when it comes to the possibility of a new report. Sure, they would also love to have a new and updated report, but they think that it is either too hard or not worth the effort. I think that is not true. Having an up-to-date report is essential for the health of our community, and it is actually possible for us to get there in a reasonable amount of time with a reasonable amount of work. Here is my plan for how we can get there, and how we can finish the process before the new year.

  • Daml for Haskellers: interview with Heitor Toledo Lassarote de Paula by Serokell

    In this interview with our Daml Team Lead, Heitor, we examine which Haskell intuitions transfer successfully to Daml, where analogies such as Update and IO break down, and how developers should reason about authorization, visibility, contract lifecycles, and testing.

  • Designing A Hook (in Haskell) by Joe Warren

    In 2018, I designed a Parametric Hook in OpenSCAD, a Programmable CAD framework. Since then, I’ve built my own library for Programmable CAD, called Waterfall-CAD. It’s written in Haskell, a purely functional programming language. In this video, I use Haskell and Waterfall-CAD, to reimplement the hook.

  • “Five-Point Haskell”: Unconditional Election (via Parametricity) by Justin Le

    Welcome back to Five-Point Haskell! This is my attempt to codify principles of writing robust, maintainable, correct, clear, and effective code in Haskell and to dispel common bad practices (or, heresies) I have run into in my time.

  • GHC 9.12.5-rc3 is now available by MangoIV

    The GHC developers are very pleased to announce the availability of the third release candidate for GHC 9.12.5, ghc-9.12.5-rc3.

  • GHC 9.14.2-rc1 is now available by Zubin

    The GHC developers are very pleased to announce the availability of the release candidate for GHC 9.14.2.

  • How to not write parsers by Chin Jen Sem

    Writing parsers is tricky and cumbersome, and that’s even with provided grammars. This post is about approaching parsing from a different angle.

  • Tomorrow comes by Mark Karpov

    Now, it’s been a while! Time sure flies. With a little bit of spare time on my hands, I decided to do a few useful things rather than simply remember and reminisce. This post presents them. It is a kind of public announcement, really.

  • Twenty Years of Pandoc by John MacFarlane

    How did this happen? I want to take advantage of pandoc’s birthday to tell the story of the project, as best I can remember it.

Jobs

  • Channable is hiring a Haskell Team Lead! by Ioana

    We are looking for a team lead for one of the teams within our Infra Platform Group. Your mission in this role is to architect and deliver foundational services that empower the product engineering teams building our e-commerce platform. Location: Utrecht, hybrid.

In brief

Show & tell

  • Explicit query-string escaping is coming to Servant! by Flavio Corpa

    We have just merged servant#1901, which makes query-string encoding explicit throughout Servant’s client stack. This will be available in the next release of Servant. It is merged into master, but it is not part of a released version yet.

  • Ghc-vis-ds: a modern port of ghc-vis with a Datastar frontend by Carlo Hämäläinen

    Here’s my port of ghc-vis with a Datastar web frontend. My hope is that this will be easy to run for beginners who want to learn about the GHC runtime, lazy evaluation, etc. It has very minimal dependencies (no gtk2, libcairo) so it ought to work if you can get GHC running with ghcup.

Call for participation