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Absolutely. For a non-exhaustive list of other languages written in Rust, there is https://github.com/alilleybrinker/langs-in-rust. If you are looking for libraries to help you along the way, check out https://github.com/Kixiron/rust-langdev.
As mentioned in other comments, type system features like algebraic data types (that Rust has) are really helpful. If you want a small-but-real example of a compiler in Rust (with an optimizer etc) then the starlark-rust compiler is good.
Absolutely. For a non-exhaustive list of other languages written in Rust, there is https://github.com/alilleybrinker/langs-in-rust. If you are looking for libraries to help you along the way, check out https://github.com/Kixiron/rust-langdev.
Such as OCaml. Incidentally, the first versions of Rust itself were written in OCaml. You can also find a ton of examples in this domain.
The best parsing (for hand coding) https://github.com/segeljakt/pratt
Nice error messages (for YOUR lang) https://github.com/brendanzab/codespan or https://docs.rs/ariadne/0.1.3/ariadne/
There are also libs that can be used for some tasks like parsing https://lib.rs/parsing and code generation like cranelift https://docs.rs/cranelift/0.76.0/cranelift/ and llvm https://github.com/TheDan64/inkwell
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