You could in principle use LLM as a formatter, linter and a borrow checker, but an actual linter, formatter and rust compiler are still faster and cheaper to run on a million lines of code. They are more reliable too because of context size limits and attention thingy (read those thinking traces when it approaches 1M limit an fucks up tool calls -- you will get the sleep deprived person vibes from it).

So first you would run the three above to pick the low hanging fruit and then ask the shaitan in a box to find more bugs. Looking from another angle -- rust is another a tool AI can use to find memory bugs, so why not have rust.

Then again, I asked the thing to write some C (more or less from scratch) few weeks ago and the next time I looked it was chasing segfaults and wondering where they came from.