#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let mut words = ["hello", "world", "of", "Rust"].into_iter();
    let hello_world: Vec<_> = words.by_ref().take(2).collect();
    assert_eq!(hello_world, vec!["hello", "world"]);
    let of_rust: Vec<_> = words.collect();
    assert_eq!(of_rust, vec!["of", "Rust"]);
}