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Artwork for The Haskell Interlude

The Haskell Interlude

Haskell Podcast
Haskell
Functional Programming
Programming Languages
Scheme
Helium Haskell Compiler
Type Classes
Functional Reactive Programming
Type Systems
Plagiarism Detection
Agda
Hardware Design
GHC
Java
Software Architecture
Computer Graphics
Higher Order Abstract Syntax
AI Coding Assistants
Fintech
Instance Chains
Extensibility

This is the Haskell Interlude, where the five co-hosts (Wouter Swierstra, Andres Löh, Alejandro Serrano, Niki Vazou, and Joachim Breitner) chat with Haskell guests!

PublishesTwice monthlyEpisodes85Founded5 years ago
Number of ListenersCategory
Technology

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Artwork for The Haskell Interlude

Latest Episodes

In this episode of the Haskell Interlude, we are joined by Sylvain Henry, one of the all-time top contributors to GHC. He tells us about his work on GHC, the bignum library, modularization, and the secret to becoming a top contributor!

This is the first part of a miniseries on this year’s Symposium on Principles of Programming Languages, a.k.a. POPL 2026, hosted by Jessica Foster.

In this episode we talk about: symbolic execution monads, what a lazy linear core in Haskell might ha... more

We talked to Fraser Tweedale. Fraser works at Red Hat, and is on the Haskell Security Response Team. We talked about security in the context of Haskell, both technical and organizational issues, and also the political issues involved. Fraser's work i... more

Mike and Andres sat down with Torsten Grust, who is a professor of DB systems at the University of Tübingen. Even though Torsten loves SQL, he's used functional programming and Haskell to inform his work on query language design and compilation. We t... more

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Recent Guests

Sylvain Henry
Top contributor to GHC, involved in GHC modularization and backend work
GHC/IOG
Episode: 84: Sylvain Henry
Andrew Hirsch
Assistant Professor at University of Buffalo
Episode: 83: POPL 2026 - Part 2
Apal Jostet
Imperial College London speaker
Episode: 83: POPL 2026 - Part 2
Yanning Chen
Co-author on extensible data and polymorphism talks
Episode: 83: POPL 2026 - Part 2
Edward Comet
Contributor referenced for hyperfunctions library
Episode: 83: POPL 2026 - Part 2
Tom Divers
PhD student at Bristol
Episode: 83: POPL 2026 - Part 2
Damien Pouss
Keynote speaker on robustness in proofs
Episode: 83: POPL 2026 - Part 2
Amal Ahmed
Researcher at Northeastern referenced for feedback on poster
Episode: 83: POPL 2026 - Part 2
Ralph Young
Judge at student research competition
Episode: 83: POPL 2026 - Part 2

Host

Andres Löh
Co-host and long-time host, central to show discussions on Haskell and FP tooling.

Reviews

4.9 out of 5 stars from 51 ratings
  • I listen to this through and through weekly, on apple podcast, but audible has a better user experience imho. Every episode is a gem! Brilliant and amazing work! Definitely worth several listens.

    Audible
    5
    Omari Enso
    United States4 years ago
  • Enlightening & Entertaining

    I listen to this through and through weekly, on apple podcast, but audible has a better user experience imho. Every episode is a gem! Brilliant and amazing work! Definitely worth several listens.

    Audible
    5
    Omari Enso
    United States4 years ago

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Talking Points

Recent interactions between the hosts and their guests.

84: Sylvain Henry
Q: Can you summarize the modularization effort and its impact on GHC?
The modularization project redefined the GHC structure into clearer components, enabling easier maintenance and the potential for independent evolution of parts of the compiler. It involved redesigning the module hierarchy, decoupling core components from the rest of the pipeline, and addressing historical naming and boundary issues that made the codebase hard to navigate.
84: Sylvain Henry
Q: What were the main challenges in building JavaScript and Wasm backends for GHC, and how did you address them?
Handling FFI in a JS environment is tricky, so a significant portion of work involved implementing pure Haskell alternatives where feasible and wiring up a Node.js-based environment to support Template Haskell and annotations. Reusing infrastructure from GHC's external interpreter for Template Haskell helped, but some features required careful preservation of type information and pipeline details to keep TLS compatibility and TH semantics intact.
84: Sylvain Henry
Q: How did you get started with optimizing Haskell code and what practical steps would you recommend?
Profiling with a Haskell tool, focusing on allocation and GC behavior, and using profiling data to guide improvements. Tools like Tiki profiling and the WellTyped debug tools can help traverse and inspect memory usage, while perf can provide hardware-level insights. The key is reducing allocations to cut down on runtime and improve predictability in CI environments.
82: Fraser Tweedale
Q: What are the funding options for security work in the Haskell ecosystem?
Possible avenues include government grants, EU or national funding programs, and potentially direct funding from commercial users via the Haskell Foundation, including offering consulting hours or other benefits to fund security efforts.
82: Fraser Tweedale
Q: What happened with the cross-site scripting issue on Hackage and how long did it take to resolve?
It was a critical vulnerability that could have compromised user sessions across many packages; it took about 18 months to fully resolve, though there were earlier mitigations.

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Frequently Asked Questions About The Haskell Interlude

What is The Haskell Interlude about and what kind of topics does it cover?

The discussions tend to center on functional programming, with a strong emphasis on Haskell, its tooling, and practical application in academia, industry, and education. Episodes frequently explore language design, compilers, type systems, and how FP concepts map to real-world problems, such as database interfacing, live coding, teaching methodologies, and conference logistics. Notable throughlines include historical context for Haskell's evolution, hands-on pedagogy, and the intersection of research with production systems, often featuring guests who are leading researchers, educators, or industry practitioners. The show also stands out for its deep dives into tooling, performance, and interoperability, making it a valuable resource for de... more

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1. Type Theory Forall
2. CoRecursive: Coding Stories
3. Oxide and Friends
4. Iowa Type Theory Commute
5. Software Engineering Radio - the podcast for professional software developers

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The Haskell Interlude launched 5 years ago and published 85 episodes to date. You can find more information about this podcast including rankings, audience demographics and engagement in our podcast database.

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What guests have appeared on The Haskell Interlude?

Recent guests on The Haskell Interlude include:

1. Sylvain Henry
2. Andrew Hirsch
3. Apal Jostet
4. Yanning Chen
5. Edward Comet
6. Tom Divers
7. Damien Pouss
8. Amal Ahmed

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