Couldn’t make it to Rapperswil, or want to revisit a talk? The recordings from this year’s Haskell Implementors’ Workshop and Haskell Ecosystem Workshop are now available online. Both workshops were held on the lakeside campus of the University of Applied Sciences of Eastern Switzerland (OST) in Rapperswil on June 4th and 5th, alongside ZuriHac, and hosted by the Haskell Foundation.

Haskell Implementors’ Workshop

The Haskell Implementors’ Workshop is a forum for everyone interested in the design and development of Haskell implementations, tools, libraries, and supporting infrastructure — whether you build them or just want to follow along. Watch the Haskell Implementors’ Workshop 2026 playlist.

This year’s program ranged from the state of the compiler to concrete tooling you can use today:

• GHC Status Report — Andreas Klebinger
• Stable Haskell, on making GHC easier to build and ship — Julian Ospald
• MicroHs Dead or Alive? — A status report — Lennart Augustsson
• Lightweight profiling with ghc-stack-profiler — Hannes Siebenhandl
• Evolving the Haskell Debugger — Rodrigo Mesquita
• Is There a Future for a Formally Specified Haskell Report — David Binder
• Towards better implicit parameters — Lorenzo Tabacchini
• GHC String interpolation — Brandon Chinn

The recordings also include a round of lightning talks. See the workshop page for the full schedule and abstracts.

Haskell Ecosystem Workshop

The Haskell Ecosystem Workshop is for everyone interested in using Haskell to build real-world tools and applications — from side projects to large production systems. Speakers share hard-won lessons on developing and maintaining Haskell software, and stay around during ZuriHac to answer questions and dig into the details. Watch the Haskell Ecosystem Workshop 2026 playlist.

The talks:

• Optimising for fast builds with GHC — Teo Camarasu
• Servant at Bitnomial — Expanding type-safety from applications to systems — Laurent P. René de Cotret
• Why you should want to contribute to the Haskell Ecosystem — Andreas Klebinger
• Flora — Théophile Choutri de Tarle
• 50,000 Lines of LLM Haskell: What Broke, What Held, and Letting Go — Jappie Klooster
• Stackage: a community Haskell source package distribution — Jens Petersen
• Haskell Security — Fraser Tweedale (published at a later date)

The full program is on the workshop page.

Enjoy!