[Rust] Cloning the value

Following code has borrow problem:

#[test]
fn main() {
    let vec0 = vec![22, 44, 66];

    let vec1 = fill_vec(vec0);

    assert_eq!(vec0, vec![22, 44, 66]);
    assert_eq!(vec1, vec![22, 44, 66, 88]);
}

fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
    let mut vec = vec;

    vec.push(88);

    vec
}

⚠️  Compiling of exercises/move_semantics/move_semantics2.rs failed! Please try again. Here's the output:
error[E0382]: borrow of moved value: `vec0`
  --> exercises/move_semantics/move_semantics2.rs:16:5
   |
12 |     let vec0 = vec![22, 44, 66];
   |         ---- move occurs because `vec0` has type `Vec<i32>`, which does not implement the `Copy` trait
13 |
14 |     let vec1 = fill_vec(vec0);
   |                         ---- value moved here
15 |
16 |     assert_eq!(vec0, vec![22, 44, 66]);
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ value borrowed here after move
   |
note: consider changing this parameter type in function `fill_vec` to borrow instead if owning the value isn't necessary
  --> exercises/move_semantics/move_semantics2.rs:20:18
   |
20 | fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
   |    --------      ^^^^^^^^ this parameter takes ownership of the value
   |    |
   |    in this function
   = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider cloning the value if the performance cost is acceptable
   |
14 |     let vec1 = fill_vec(vec0.clone());
   |                             ++++++++

error: aborting due to previous error

For more information about this error, try `rustc --explain E0382`.

 

Follow the suggestion, we can use clone():

let vec1 = fill_vec(vec0.clone());