在“匹配”声明“使用的部分移动值”错误

Question

我的代码：

fn main() { 
    let mut messages = vec![]; 

    let msg = Message::Write{message: "msg".to_string()}; 
    match msg { 
     Message::Write{message} => println!("{}", message), 
    }; 

    messages.push(msg); 
} 

enum Message { 
    Write{message: String}, 
} 

错误：

error: use of partially moved value: `msg` [--explain E0382] 
    --> <anon>:9:19 
6 |>   Message::Write{message} => println!("{}", message), 
    |>      ------- value moved here 
... 
9 |>  messages.push(msg); 
    |>     ^^^ value used here after move 
note: move occurs because `msg.message` has type `std::string::String`, which does not implement the `Copy` trait 

error: aborting due to previous error 

它看起来像的message领域的变化在match块所有权。我只想在输入enum的值之前输入Vec。我如何进行编译？

Answer 1

通过引用而不是通过值绑定到message字段。

match msg { 
     Message::Write{ref message} => println!("{}", message), 
    };