A Roundup of ICFP/SPLASH 2025 happenings / Oct 2025

I had an amazingly fun week at ICFP/SPLASH in Singapore; it was the first time that these two major programming languages conferences were held simultaneously. My submissions turned into a bit of a success disaster; I ended up chairing a workshop, giving several talks and a keynote, and organising a tutorial, and helping out a bunch of colleague and students. And if this wasn't enough to fill up the week, collaborators I hadn't seen in a few years were also presenting a tonne of interesting work, so there was no time to breathe!

So much went on that I've split up the post into a five parter:

• Part 1: Chairing the 2nd Programming for the Planet Workshop
• Part 2: Holding a tutorial on OxCaml
• Part 3: Migrations to OCaml 5 with Jane Street and Docker
• Part 4: My case for post-POSIX IO being important for runtime designers
• Part 5: What I learnt from other people's talks and chats