rustlings/exercises/06_move_semantics/move_semantics4.rs

// Refactor this code so that instead of passing `vec0` into the `fill_vec`
// function, the Vector gets created in the function itself and passed back to
// the test function.

// `fill_vec()` no longer takes `vec: Vec<i32>` as argument - don't change this!
fn fill_vec() -> Vec<i32> {
    // Instead, let's create and fill the Vec in here - how do you do that?
    let mut vec = vec;

    vec.push(88);

    vec
}

fn main() {
    // You can optionally experiment here.
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn move_semantics4() {
        let vec0 = vec![22, 44, 66];

        let vec1 = fill_vec(vec0);

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