#![allow(unused_variables)]
fn main() {
    use std::collections::BinaryHeap;
    let mut heap = BinaryHeap::from([-10, -5, 1, 2, 4, 13]);
    heap.retain(|x| x % 2 == 0);
    assert_eq!(heap.into_sorted_vec(), [- 10, 2, 4])
}