I think a low effort, high value step in the usability direction of a REPL is cargo-script

I've written some on it [0] and there was a recent reddit thread discussing it [1]

[0] https://epage.github.io/blog/2021/09/learning-rust/

[1] https://www.reddit.com/r/rust/comments/rddokp/media_most_up_...