You can do this sort of thing with Objective C precisely because the layer between ObjC and C is so clean and concise. It's a strict superset of the C language;

You can do this sort of thing with Objective C precisely because the layer between ObjC and C is so clean and concise. It's a strict superset of the C language; the C at its core is pure and entirely unmolested. What makes interoperability possible is Rust's existing C interop. Rust doesn't have any Swift interop.