In Zig, the main function can return either a u8 or void (which always returns 0) or it can return an error union !void, where if you allow an error to bubble u

In Zig, the main function can return either a u8 or void (which always returns 0) or it can return an error union !void, where if you allow an error to bubble up to main, it'll print an error trace and return 1.