#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let text = "foo\r\nbar\n\nbaz\r";
    let mut lines = text.lines();
    assert_eq!(Some("foo"), lines.next());
    assert_eq!(Some("bar"), lines.next());
    assert_eq!(Some(""), lines.next());
    assert_eq!(Some("baz\r"), lines.next());
    assert_eq!(None, lines.next());
}