On balance I think using dot for record selection in GHC (OverloadedRecordDot) was a mistake. Having dot be either function composition or record selection depending on whitespace is just not a good design, for either experienced or inexperienced users. 1/2

Blog post: Indexing Hackage: Glean vs. hiedb simonmar.github.io/posts/2025-0...

I'm thinking about a second edition of Parallel and Concurrent Programming in Haskell. Any thoughts on what should be added (or removed)? What's missing, what updates are needed to reflect common usage? The obvious new things are async and Haxl. Should the chapter on distributed-process be kept?

Yesterday I left Meta after 12 years. Freedom feels good!

"Indexing code at scale with Glean" We finally got round to writing a blog post about Glean, the thing I work on. engineering.fb.com/2024/12/19/d...

If you have a bytecode interpreter and you want to make it faster, do you (a) JIT it using LLVM or (b) use Wasm or (c) something else? Given that LLVM is already a dependency (and dependencies matter), but you would like sandboxing/safety too.

I sometimes get compliments on my laptop stickers in meetings. Especially the one in the middle, which I tracked down after seeing it on my daughter's laptop (and who now insists on getting credit for it, ergo)