A.I. is useful for this. But it would be even more useful if all new code were written in Rust or some other memory-safe language.
A.I. could also be used to port C/C++ codebases to Rust, which isn't economically feasible at the moment.
I mean I get the sentiment but Rust won't save you against division by zero, it'll just panic at runtime like every other language.
AI will have plenty of security bugs left to find in Rust codebases.