gistfile1.rs

fn process_files(files: Vec<File>, progress: Sender<uint>) {
    let mut it = files.iter().filter(|&f| test_file(f)).enumerate();
    loop {
        let (i, f) = match it.next() {
            None => break,
            Some(x) => x
        };
        if i % 100 == 0 {
            let (lower, upper) = it.size_hint();
            progress.send(upper.unwrap_or(lower));
        }
        process_file(f);
    }
}