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PL Scaffolding project?
3 projects | reddit.com/r/ProgrammingLanguages | 25 Oct 2022
Andrej Bauer's plzoo?
Can i use rust to write my compiler??
8 projects | reddit.com/r/rust | 31 Aug 2021
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.
What are some alternatives?
rust-langdev - Language development libraries for Rust
langs-in-rust - A list of programming languages implemented in Rust, for inspiration.
inkwell - It's a New Kind of Wrapper for Exposing LLVM (Safely)
starlark-rust - A Rust implementation of the Starlark language
codespan - Beautiful diagnostic reporting for text-based programming languages.