The 2025h2 goal period is now over, so I'm closing this issue. Thanks to everyone who contributed! The experimental language specification goal will continue this work in the 2026 period. Authors are welcome to leave a final comment about the goal's outcome.
There has been a lot of progress and the regular meetings were as useful as always, thanks a lot everyone!
(and to Tomas for keeping track of things and taking minutes, even when the meetings ran over :)
I hope the next period will be the one that sees the Linux kernel essentially removing the last three unstable language features we use (modulo the new ones being added), and getting very close to finishing the list of the compiler features side too.