[SimonSapin]

Yes, I've had Rust code and C++/mbed code in the same program. But C++ is still an issue, I wrote a C wrapper for the one C++ method I was using. Doing so for all of mbed would be very tedious and fragile.

Servo's fork of rust-bindgen https://github.com/servo/rust-bindgen has some C++ support and might be able to generate bindings for all(?) of mbed (at least for a given hardware configuration), but I haven't tried.