Comment by rekoil

As I understand it everything Rust is seen as "optional", so a CONFIG_RUST=n build that succeeds means a-OK, then some Rust person will do a CONFIG_RUST=y build, see it's broken, fix it, and submit a patch.

I may be wrong, but that's how I understood it, but who knows how Linus will handle any given situation. ¯\_(ツ)_/¯