Thanks! Macroexpanded:

P: A programming language for asynchrony, fault-tolerance and uncertainty - https://news.ycombinator.com/item?id=14377941 - May 2017 (40 comments)

The P programming language - https://news.ycombinator.com/item?id=12673739 - Oct 2016 (87 comments)

I don't remember seeing it back then. I hope that it has somehow improved during the 6 years that passed.

Yes, P has been updated a lot in the last 6 years. Much better documentation and compiler. There is going to be a new release in a couple of months with a verifier as well as a way to check P specifications on implementation.