If you allow me, my take on the list: * Clojure is a really nice and simple language, but the tooling and documentation comes nowhere near go, also it uses JVM

If you allow me, my take on the list: * Clojure is a really nice and simple language, but the tooling and documentation comes nowhere near go, also it uses JVM, which would already disquilify as go replacement. * Rust is nice (or even better in a lot points) but a lot harder. Concurrency in go is just lot easier. * Elixir, I agree, although I don't have much experience of the language. * Crystal, not clue about this lang xD.