/// This example demonstrates the difference between `iter()` and `into_iter()`.
fn main() {
let vec1 = vec![1, 2, 3];
let vec2 = vec![4, 5, 6];
// `iter()` for `Vec<i32>` yields `&i32`, which we
// destructured via the `&x` pattern.
// It only borrows `vec1` and its elements,
// so they can be used again.
println!("2 in vec1: {}", vec1.iter().any(|&x| x == 2));
// `into_iter()` for vecs yields `i32`. No destructuring is required.
// `into_iter()` does move `vec2` and its elements, so they cannot be
// used again
println!("2 in vec2: {}", vec2.into_iter().any(|x| x == 2));
}