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It always surprises me when new languages don't make a REPL a top priority. It's such a crucial thing for a good developer experience. Rust still doesn't have one, as far as I know, and it's a major pain point for me as a light user of the language.

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Rust expressions are very contextual due to things like the borrow checker, though, and a REPL basically means that every bound top level name has an infinite lifetime. That would make some things very awkward.

Rust has a REPL under development on github: https://github.com/murarth/rusti

Seems to be active up until around July-August

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