这段程序会输出什么？

这段程序会输出什么？

fn main() {
    let mut tasks = vec!["parse", "index", "publish"];
    let first = tasks.remove(0);
    tasks.push("notify");

    println!("first: {first}");
    println!("left: {tasks:?}");
}

1. first: parse left: ["index", "publish", "notify"]
2. first: publish left: ["parse", "index", "notify"]
3. first: parse left: ["parse", "index", "publish", "notify"]
4. 编译失败，因为 remove 不能把元素移出向量。