Thanks I was looking for that. I've seen a video about that some time ago and couldn't remember the name or the anything.

For those interested here's a link to the actual project:

* https://github.com/stephenrkell/liballocs

Probably a lot of overlap with the links upthread, but [0] also goes over Unix and Smalltalk (and I only just realized is also by Stephen Kell).

[0] https://dl.acm.org/doi/10.1145/2525528.2525534

This quote from Dan Ingalls is also relevant:

"An operating system is a collection of things that don’t fit into a language. There shouldn’t be one."

Joel Jakubovic's talk is here: https://youtu.be/gD7ajjCHYbU?t=20378 It includes Q+As from a number of people, including Stephen Kell.