There are many, here's a simple Google search:

https://github.com/jyn514/saltwater

https://github.com/ClementTsang/rustcc

https://github.com/maekawatoshiki/rucc

Language doesn't really matter, it's not how things are mapped in the latent space. It only needs to know how to do it in one language.

Being written in rust is meaningless IMHO. There is absolutely zero inherent value to something being written in rust. Sometimes it's the right tool for the job, sometimes it isn't.