Haskell Weekly


Issue 380 2023-08-10

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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.


Typeclass instances are a powerful tool for specifying which overloaded operations are allowed on which types. But what about specifying which operations are disallowed on which types?

The Cabal team would like to ask our users if anyone would object to the Nix Integration 19 being removed (following a reasonable deprecation cycle).

Randomly generated inputs tend to be large and should therefore be minimised. Traditionally this is done with an explicitly provided shrinker, but in this paper we propose a way to write generators that obsoletes the need to write a separate shrinker.

The GHC team would like input on module/package naming for the planned restructuring of the libraries shipped with GHC. Please take a look at the proposal and let us know what you think!

The GHC developers are happy to announce the availability of GHC 9.4.6.

This blog post explains a new feature for GHC & Cabal, which allows multiple simultaneously running GHC processes to coordinate their use of compute resources.

This article is about profiling and picking the low-hanging fruit of tree-sitter-haskell (warning: C(++)).


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In brief

As part of my Core Libraries Committee (CLC) involvement, I committed to writing monthly CLC updates.

Put the power of Haskell to work in your programs, learning from an engineer who uses Haskell daily to get practical work done efficiently.

We introduce the framework FreeCHR, which formalizes the embedding of Constraint Handling Rules (CHR) into a host-language.

The last few days have been spent on emergent issues.

Triweekly update from the GHC DevX team at IOG.

Show & tell

I’m happy to announce Saturn, a small Haskell library for handling POSIX cron schedules.

cfg is a library that provides Generic machinery for generating configuration accessors, and parsers from Haskell types.

I’m happy to announce the release of a new library for web-servers. It offers simple and concise functions to build servers from small parts.

Check out this Haskell Competitive Programming Template I’ve created for solving competitive programming challenges (e.g. CodeForces).

I’m very happy to announce the release of Yampa 0.14.4 and yampa-test 0.14.4.

Call for participation

The ACM SIGPLAN Workshop on Functional Software Architecture - FP in the Large aims to disseminate and enable the use of functional programming in the large and long-lived software projects.

The ACM SIGPLAN International Workshop on Functional Art, Music, Modelling and Design (FARM) gathers together people who are harnessing functional techniques in the pursuit of creativity and expression.