[ameixaseca]

Please see [1]. Around 28:45 the talk moves to effect types. At around 29:25 the proposed mechanism (with throw) is literally described as "checked exceptions".

AFAIK, this is all part of the roadmap.

[1] https://www.janestreet.com/tech-talks/effective-programming/

[rixed]

Yes thank you, exactly what I was looking for.