The multiple implementation story of Rust isn't as great as some older languages, but it's getting there. There are at least two e2e implementations of Rust:

The multiple implementation story of Rust isn't as great as some older languages, but it's getting there. There are at least two e2e implementations of Rust: - rustc, the reference implementation. - mrustc, an alternative written in C++ [1]. There are also multiple implementations Rust's IR (MIR): - rustc compiles MIR to LLVM. - A backend that compiles MIR to Cranelift [2]. - Miri, a MIR interpreter used for dynamic analysis [3]. mrustc doesn't perform the borrow check, so it can't prevent you from triggering UB like rustc. But you can use rustc for the borrow check and mrustc for codegen. [1]: https://github.com/thepowersgang/mrustc https://github.com/thepowersgang/mrustc [2]: https://github.com/bjorn3/rustc_codegen_cranelift https://github.com/bjorn3/rustc_codegen_cranelift [3]: https://github.com/rust-lang/miri https://github.com/rust-lang/miri