use std::str::Chars;

fn scan_name(stream: &mut Chars) -> String {
    stream.take_while(|character| !character.is_whitespace() && *character != ':').collect()
}

#[test]
fn test_it() {
    let foo = "foobar:baz";
    assert_eq!(scan_name(&mut foo.chars()), "foobar")
}