#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let s = "Can you find a needle in a haystack?";
    assert_eq!(s.find("you"), Some(4));
    assert_eq!(s.find('n'), Some(2));
    assert_eq!(s.find(& ['a', 'e', 'i', 'o', 'u']), Some(1));
    assert_eq!(s.find(& ['a', 'e', 'i', 'o', 'u'] [..]), Some(1));
    assert_eq!(s.find(| c : char | c.is_ascii_punctuation()), Some(35));
}