I can only speak about the Rust side. Seriously, pick it up. It is more than a replacement for C. You get a total replacement of C + a loooot of extra stuff, like no null pointers, memory safety, C compatibility for FFI, iterator and list comprehension goodness, and just a lot of good practices. At least for me, Rust is the perfect mix between C and Haskell. YOu get the low level stuff of C, and the expressiveness and joy of Haskell, without all the brain-hurt from Haskell.

Side note: I do love Haskell, but let's admit it, the learning curve is pretty steep once you hit monads/comonads.