#![allow(unused_variables)]
#![feature(binary_heap_drain_sorted)]
fn main() {
    use std::collections::BinaryHeap;
    let mut heap = BinaryHeap::from([1, 2, 3, 4, 5]);
    assert_eq!(heap.len(), 5);
    drop(heap.drain_sorted());
    assert_eq!(heap.len(), 0);
}