#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let x = [1, 2, 3];
    let y = x.map(|v| v + 1);
    assert_eq!(y, [2, 3, 4]);
    let x = [1, 2, 3];
    let mut temp = 0;
    let y = x
        .map(|v| {
            temp += 1;
            v * temp
        });
    assert_eq!(y, [1, 4, 9]);
    let x = ["Ferris", "Bueller's", "Day", "Off"];
    let y = x.map(|v| v.len());
    assert_eq!(y, [6, 9, 3, 3]);
}