Bun is an unrepresentative example of a Rust codebase for this purpose because (1) it was a direct port from a memory-unsafe language, and (2) it has a major C++ dependency (JavaScriptCore) whose objects in memory are deeply entangled with its own in very lifetime-complicated ways, which is something like the worst-case scenario for Rust's model of memory safety encapsulation.

Ah, so it's more that "LLMs just bypass Rust's safety" rather than "LLMs write perfect C"? That's a more fair argument.