[fouc]

At least he didn't write it in node.js /s

Other interesting alternatives to c or rust might be vlang or zig.

[xvilka]

For V language there is Vinix[1], for Zig there's a kernel[2] only.

[1] http://vinix-os.org/

[2] https://github.com/jzck/kernel-zig

[tentacleuno]

Well, that's already been done. https://node-os.com