Anecdotally, Gemini 2.5 Pro has been yielding good results lately for Rust. It's been able to one-shot pretty intricate proc macros that required multiple supporting functions (~200 LoC).

Strong typing is super helpful when using AI, since if you're properly grounded and understand the interface well, and you are specifying against that interface, then the mental burden of understanding the output and integrating with the rest of the system is much lower compared to when large amounts of new structure is created without well defined and understood bounds.