About on par with C/C++ and Go. In that you don't have one and don't want for one. REPL driven development is difficult with languages like Rust, both to implement and use.
I think there are some projects floating around out there, but I personally don't see a purpose for one. It's not python or matlab.
The latest TWIR development summary mentions evcxr, a notebook-based environment for Rust that's currently being worked on, link https://blog.abor.dev/p/evcxr
Notebooks work better than raw REPL's for a language that's so heavily based on static typing, but they're idiomatically quite similar.
About on par with C/C++ and Go. In that you don't have one and don't want for one. REPL driven development is difficult with languages like Rust, both to implement and use.
I think there are some projects floating around out there, but I personally don't see a purpose for one. It's not python or matlab.