7 fn chars(self) -> std::str::Chars<'static> {
14 let def = String::from("def");
15 let mut s = String::new();
18 s.extend(abc.chars());
21 s.extend("abc".chars());
24 s.extend(def.chars());
26 s.extend(abc.chars().skip(1));
27 s.extend("abc".chars().skip(1));
28 s.extend(['a', 'b', 'c'].iter());