I've had "playing with val" on the back-burner for a while. Finally tried to today, only to learn that even after 4,000 commits it's still a long shot from usable. Most of the examples from the language tour don't compile, even seemingly simple ones.

Carbon has yet to deliver on anything yet, even as Sean Baxter has been making lots of progress on the Circle compiler (including implementing lots of the good bits from Carbon).

Hard to be a successor when you can't really be considered a language yet.