[mercurial]

> Rust is a compiled language. There's a compile step when you make a code change.

That said, it really depends on what you're doing. If you are debugging something, it can be a bit painful but not terrible (typically, you're just changing a few things as you go along). If you're implementing a feature or refactoring, you're better served using "cargo check" (especially in combination with "cargo watch") to only run typechecking but not code generation, which means extremely fast feedback.