I got it a bit wrong. It was Caml.NET.

https://www.microsoft.com/en-us/research/project/f-at-micros...

ML (Meta Language) vs ML (Machine Learning). It is confusing.

When I hear ML, I think the language (cause I am "old"), but it is usually the process (Machine Learning) cause that is what is hot.

https://en.wikipedia.org/wiki/ML_%28programming_language%29

Right - I'm pretty familiar with Ocaml so the distinction is pretty clear on my end. I'm just a bit suspicious of this one thing in the comment I replied to.