Rust doesn't have a repl (well it kind of does: the rust compiler slack bot that runs code you ask it to...), but if you use rust-analyzer the feedback cycle is

Rust doesn't have a repl (well it kind of does: the rust compiler slack bot that runs code you ask it to...), but if you use rust-analyzer the feedback cycle is just as fast. There's also https://play.rust-lang.org/ https://play.rust-lang.org/ for testing short bits of code in a persistent editor.