Unstable compilers

Certainly not, but the stability of `rustc` is often much higher than many give it credit for, and that Rust gives much better ABI(*)/linking guarantees. It is often not plausible to use a different GCC version from what compiled the kernel to compile custom modules for example. Rust can provide much stronger guarantees here by default, though as mentioned in the article there is in-kernel work to be done for the module symbol naming/linking.

Rust in *most* cases will either halt compilation with an Error, and InternalCompilerError, or result in symbols that will fail at linking time instead of (used to be more) commonly "compiling" fine but crashing/failing at runtime or `insmod` time.

* Rust technically has no ABI, but you can expose/use one via various exports/macro things, commonly of course a "c-abi". This is mostly handled by `rust-bindgen` for automation with a dash of human control when required.