这个问题在这里已有答案：

我的目标是编写一个函数，它将 Rc<RefCell<&'a mut [u8]>> 作为参数并返回一个包含对内部切片的引用的结构，但我不能满足借用检查器 . 我的第一次尝试看起来像这样：

pub fn mk_buf_holder<'a>(buf: Rc<RefCell<&'a mut [u8]>>) -> BufHolder<'a> {
    BufHolder::<'a> { buf: buf.borrow_mut().deref_mut()}
}

但是，这当然不起作用，因为 borrow_mut 的结果超出了范围 . 我的下一次尝试为结构添加了额外的成员，只是为了保持原本可能是暂时的值 . 我认为将它们放入结构中将使它们具有与_983143相同的生命周期，但借用检查器不同意 . 这是完整的例子：

use std::cell::{Ref, RefCell, RefMut};
use std::ops::DerefMut;
use std::rc::Rc;

pub struct BufHolder<'a> {
    buf: &'a mut [u8],
    bufclone: Rc<RefCell<&'a mut [u8]>>,
    bufref: RefMut<'a, &'a mut[u8]>
}

pub fn mk_buf_holder<'a>(buf: Rc<RefCell<&'a mut [u8]>>) -> BufHolder<'a> {
    let bufclone = buf.clone();
    let bufref = bufclone.borrow_mut();
    BufHolder::<'a> { bufclone: bufclone,
                      buf: bufref.deref_mut(),
                      bufref: bufref }
}

编译器仍然告诉我， borrow_mut() 的结果并不像编译器正在复制到输出中，而是移动它 . 我该如何修复这个功能？

error: `bufclone` does not live long enough
  --> src/main.rs:13:18
   |
13 |     let bufref = bufclone.borrow_mut();
   |                  ^^^^^^^^ does not live long enough
...
19 | }
   | - borrowed value only lives until here
   |
note: borrowed value must be valid for the lifetime 'a as defined on the body at 11:74...
  --> src/main.rs:11:75
   |
11 |   pub fn mk_buf_holder<'a>(buf: Rc<RefCell<&'a mut [u8]>>) -> BufHolder<'a> {
   |  ___________________________________________________________________________^ starting here...
12 | |     let bufclone = buf.clone();
13 | |     let bufref = bufclone.borrow_mut();
14 | |     BufHolder::<'a> {
15 | |         bufclone: bufclone,
16 | |         buf: bufref.deref_mut(),
17 | |         bufref: bufref,
18 | |     }
19 | | }
   | |_^ ...ending here

error: `bufref` does not live long enough
  --> src/main.rs:16:14
   |
16 |         buf: bufref.deref_mut(),
   |              ^^^^^^ does not live long enough
...
19 | }
   | - borrowed value only lives until here
   |
note: borrowed value must be valid for the lifetime 'a as defined on the body at 11:74...
  --> src/main.rs:11:75
   |
11 |   pub fn mk_buf_holder<'a>(buf: Rc<RefCell<&'a mut [u8]>>) -> BufHolder<'a> {
   |  ___________________________________________________________________________^ starting here...
12 | |     let bufclone = buf.clone();
13 | |     let bufref = bufclone.borrow_mut();
14 | |     BufHolder::<'a> {
15 | |         bufclone: bufclone,
16 | |         buf: bufref.deref_mut(),
17 | |         bufref: bufref,
18 | |     }
19 | | }
   | |_^ ...ending here
rust