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Not only is it possible, being able to do so well is a design constraint on the language.

The RUST FFI is just the C function interface. You can completely fool the C code that you are also C code.

Yep! At our company, for example, we have built a plugin for PAM in Rust which exposes all the necessary functions with a C interface.

This sounds really interesting! Is the source available somewhere?

Theoretically yes, rust binaries can have C-apis and other code can call them just fine.

With the caveat that, naturally, these APIs can only expose concepts that C can understand, so you're a bit limited. No generics, for example.

Also, no memory safety...

Well its the C coding calling the Rust that has no memory safety, the rust code exposed as the C binary will (assuming no unsafe block) be memory safe, despite appearing to C like other C code.