Zig is nowhere near mature enough to be considered for the kernel yet. There are breaking changes to it regularly still - which is a good thing for Zig now, but

Zig is nowhere near mature enough to be considered for the kernel yet. There are breaking changes to it regularly still - which is a good thing for Zig now, but not so good for huge, long-lived codebases like Linux. Also compiler bugs happen. Saying this as someone who generally likes Zig's direction.