Converting a Vec<Item> to Vec<Option<Item>> in Rust

vec-to-vec-option.rs

// We need to use Vec::into_iter() instead of Vec::iter() to create a consuming
// iterator that moves each value out of the vector.

fn main() {
    let v = vec![1, 2, 3];
    let v: Vec<Option<i32>> = v.into_iter().map(Some).collect();
    assert_eq!(v, [Some(1), Some(2), Some(3)]);
}