Haskell Weekly

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

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• r/Haskell is going dark by Taylor Fausak

  As one of its moderators, I am making the Haskell sub-Reddit private to protest Reddit’s planned changes to API pricing.

• Anonymous sums from scratch by Jason Shipman

  Haskell has strong support for sum types, but has no built-in notion of anonymous sum types.

• Coverage-guided fuzzing of Haskell programs for cheap by Cheng Shao

  I discovered a simple trick that allows us to compile Haskell code in a manner that these fuzzers can handle.

• Derived Instances Can Break Smart Constructors, Too by Jezen Thomas

  When you have a newtype which wraps some primitive text value, it can be tempting to ask the compiler to derive the FromJSON instance using the GeneralizedNewtypeDeriving language extension.

• GHC Language Extensions Compatibility by Damián Franco Álvarez

  GHCanIUse is a tool that generates an HTML page with a table of supported language extensions for different versions of GHC (Glasgow Haskell Compiler).

• Haddock+Doctest+Cairo = ♥ by David Luposchainsky

  This is not only a great appetizer for casually browsing the lib, but also features loads of small examples that can be copypasted and played around with, cutting the whole path from I want to use this to I use this short.

• Monad transformers 101 by William Yao

  In this post, I go over what monad transformers are and how to use them.

• ZuriHac 2023 trip report by Tristan de Cacqueray

  The Haskell community gathered on the OST campus for the ZuriHac, a three days hackathon, packed with all sort of events.

Jobs

• Senior Software Engineer at Freckle

Trying to hire a Haskell developer? You should advertise with us!

In brief

• CLC Update (June 2023) by Dmitrii Kovanikov

  As part of my Core Libraries Committee (CLC) involvement, I committed to writing monthly CLC updates, and this is the 4th update.

• GHC+DH Weekly Update #7, 2023-06-14 by Andrei Borzenkov

• Haskell Foundation DevOps Weekly Log, 2023-06-14 by Bryan Richter

  During the last week, I attended Zurihac and the GHC Contributors’ Workshop that preceded it.

• The Haskell Unfolder Episode 5: composing left folds by Andres Löh

  In this episode, which is based on a former Well-Typed interview problem, we will discuss how to perform multiple simultaneous computations on a text file, gathering some statistics.

• IOG GHC Update #12 by IOG

  Biweekly update from the GHC DevX team at IOG.

• Stability Working Group May 2023 Update by Trevis Elser

  The Stability Working Group has continued to meet and this is to provide a monthly view into the discussions, and projects.

Show & tell

• Fourmolu version 0.13.0.0

  Fourmolu is a formatter for Haskell source code. It is a fork of Ormolu, with upstream improvements continually merged.

• Tiki Tech by Phil Curzon

  Tiki Tech is a football simulation engine/game that attempts to simulate the game of football from first principles.

Call for participation

• gigaparsec: Low hanging optimizations
• hoauth2: Implement instance HasRefreshTokenRequest 'ResourceOwnerPassword