gistfile1.txt

why does the for-loop consume `evts`:

fn next_start_elem<R: Read>(evts: &mut Events<R>) -> Result<String, Error> {
    for evt in evts {
        if let XmlEvent::StartElement{ name, .. } = try!(evt) {
            return Ok(name.local_name);
        }
    }
    let _ = evts.text_position();
    Err(Error::UnexpectedEof)
}

error:

parser.rs:52:13: 52:17 error: use of moved value: `*evts` [E0382]
parser.rs:52     let _ = evts.text_position();
                         ^~~~
parser.rs:52:13: 52:17 help: run `rustc --explain E0382` to see a detailed explanation
parser.rs:47:16: 47:20 note: `evts` moved here because it has type `&mut xml::reader::Events<R>`, which is non-copyable
parser.rs:47     for evt in evts {
                            ^~~~


while this is ok:

fn next_start_elem<R: Read>(evts: &mut Events<R>) -> Result<String, Error> {
    loop {
        match evts.next() {
            Some(evt) => {
                if let XmlEvent::StartElement{ name, .. } = try!(evt) {
                    return Ok(name.local_name);
                }
            }
            None => break,
        }
    }
    let _ = evts.text_position();
    Err(Error::UnexpectedEof)
}

Events implements Iterator as:

impl<R: Read> Iterator for Events<R> {
    type Item = Result<XmlEvent>;

    #[inline]
    fn next(&mut self) -> Option<Result<XmlEvent>> {
...