@jadi I enjoyed tickling my mind with #Haskell after learning #RustLang. I have no intention to use Haskell, I don't think it is practical for what I do and prefer, especially because it doesn't offer the highest performance. But learning it was fun, a small challenge though.
You will see how Rust borrows many of the useful and practical concepts of functional programming languages. Seeing something from a different angle gives me a deeper understanding sometimes.
@jadi
If you want even newer and more of a work in progress then Zig, I stumbled upon a language called C3 a bit ago. Haven't actually tried to program in it yet.
@jadi
And if you decide to go that path I highly recommend these slides:
https://github.com/google/haskell-trainings/releases
I attended his training on Google campus in 2016 and it was two days of pure fun.