For Rust I've seen people reference Rust Koans (https://github.com/crazymykl/rust-koans https://github.com/crazymykl/rust-koans), but I haven't looked at that m

For Rust I've seen people reference Rust Koans (https://github.com/crazymykl/rust-koans https://github.com/crazymykl/rust-koans), but I haven't looked at that myself. I wanted a project that was sizeable enough to force me to use a good number of language features (but not all). I think the interpreter was a pretty good balance there, but it definitely took a time investment.