Rustlings: move_semantics1.rs #Issue23 — Move Semantics in Rust

Rustlings Challenge: move_semantics1.rs Solution Walkthrough

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This is the twenty-third (23rd) issue of the Rustlings series. In this issue, we provide solutions to Rustlings exercises along with detailed explanations. In this issue we will solve the challenge on move_semantics1.rs.

Previous challenge #Issue 22

Rustlings: vecs2.rs #Issue22 — Vectors in Rust

Challenge:

// move_semantics1.rs
//
// Execute `rustlings hint move_semantics1` or use the `hint` watch subcommand
// for a hint.

// I AM NOT DONE

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

    let vec1 = fill_vec(vec0);

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

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

    vec.push(88);

    vec
}

If you run the code on your editor, the compiler will throw the error:

   Compiling playground v0.0.1 (/playground)
error[E0596]: cannot borrow `vec` as mutable, as it is not declared as mutable
  -->…