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

    exit();
}

fn add(a: u32, b: u32) void {
    const c = a + b; // 7
    const d = a + c; // 10
    const e = d + b; // 14
    assert(e == 14);
}

pub fn assert(ok: bool) void {
    if (!ok) unreachable; // assertion failure
}

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