Rust indeed has good features I enjoy having them. But the joy I can have in Lisp, I cannot have in other traditional(or ordinary?) languages. I've developed an ML backend with Rust over 3 years to learn that for algorithm research and testing, Lisp ecosystem is much better than Rust. But I haven't done the research yet to see if there is a Lisp other than CL which is performant enough. Because CL is quite obscure and has self contradicting features, thus not mature.