1. struct S {
    2.     a: String,
    3. }
    4. fn main() {
    5.     let mut s1 = S {
    6.         a: String::from("aaa"),
    7.     };
    8.     let mut s2 = S {
    9.         a: String::from("bbb"),
    10.     };
    12.     let a = (&mut s1, &mut s2);
    14.     let b = a.1;  // the second element of a has been moved, thus only the first element left
    15.     let d = a.0; // this is ok;
    16.     let c = a; //compile failed
    17. }
    19. error[E0382]: use of moved value: `a`
    20.   --> src/main.rs:15:13
    21.    |
    22. 14 |     let b = a.1;
    23.    |             --- value moved here
    24. 15 |     let c = a;
    25.    |             ^ value used here after partial move
    26.    |
    27.    = note: move occurs because `a.1` has type `&mut S`, which does not implement the `Copy` trait