edit: You are right, I did not know there was a third version. If only this thing had release notes. I have no idea the current state of the language is. Hongwei, if you're listening!
If this language is going to be a thing it needs community development.
doublec 2 minutes ago [-]
ATS2 has been effectively frozen for a number of years, the recent commits have mostly been build changes so it can compile ATS3. ATS2 is stable and usable today and release notes are in the CHANGES-ats2 in the repo. I have a few posts showing some of the features on my blog (https://bluishcoder.co.nz/tags/ats/) for ATS2 and the previous version, ATS1. ATS3 is under development. It compiles itself but from what I can tell it is not generally usable at the moment. It's main design change is two-layer type checking. ML-style first, dependent types on top, in an attempt to lower the learning curve. The ats-lang-users google group is probably the best place to follow progress.
mlinksva 6 hours ago [-]
It's "very very minorly" (that's the only commit message used) difficult to follow, but I'm pretty sure ATS2 (Postiats) is in maintenance mode (activity is build changes), with ATS3 (Xanadu) https://github.com/githwxi/ATS-Xanadu being the focus of active development.
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https://hn.algolia.com/?query=The%20ATS%20Programming%20Lang...
MLton and Felix would be two other ML inspired languages that whole program optimizes to generate fast code.
http://www.mlton.org/
https://felix.readthedocs.io/en/latest/
edit: You are right, I did not know there was a third version. If only this thing had release notes. I have no idea the current state of the language is. Hongwei, if you're listening!
If this language is going to be a thing it needs community development.