export fn _start() noreturn {
    add(3, 4);

    exit();
}

fn add(a: i32, b: i32) void {
    if (a + b != 7) unreachable;
}

fn exit() noreturn {
    asm volatile ("syscall"
        :
        : [number] "{rax}" (231),
          [arg1] "{rdi}" (0)
        : "rcx", "r11", "memory"
    );
    unreachable;
}