#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let slice = &[1, 1, 2, 3, 2, 3, 2, 3, 4];
    let mut iter = slice.chunk_by(|a, b| a <= b);
    assert_eq!(iter.next(), Some(& [1, 1, 2, 3] [..]));
    assert_eq!(iter.next(), Some(& [2, 3] [..]));
    assert_eq!(iter.next(), Some(& [2, 3, 4] [..]));
    assert_eq!(iter.next(), None);
}