Very cool idea! I can't wait to use this next time I need bindings to an API.
As a side note, I wanted to go see what code was generated (and check the quality) but I couldn't find a docs.rs or github for the rust example (did I miss it?). I ended up having to look it up on docs.rs and was surprised that there were no comments there.
Do you have plans to add language-level documentation for the generated code?