構造体や列挙体などオブジェクト要素にCopy/Cloneが実装されてない型の複製(@Rust)

  |     #[derive(Copy, Clone)]
  |              ^^^^
  |     struct S {
  |         x: Vec,
  |         ----------- this field does not implement `Copy`

fn main() {
    #[derive(Copy, Clone)]
    struct S {
        x: Vec<i32>,
    }
    /*impl Clone for S {
        fn clone(&self) -> Self {
            S { x: self.x.clone() }
        }
    }*/
    let mut s1 = S { x: vec![12] };
    let s2 = s1.clone();
    s1.x[0] += 1;
    print!("{} {}", s1.x[0], s2.x[0]);

    //
    // same as above(this field(x: Vec) does not implement `Copy`)
    // Object members are out of target, Copy/Clone is applied only to struct S/S1
    //

    struct S1 {
        x: Vec<i32>,
    }
    impl Copy for S1 {}
    impl Clone for S1 {
        fn clone(&self) -> Self {
            *self
        }
    }
}