#![allow(unused_variables)]
fn main() {
    use std::collections::BinaryHeap;
    use std::collections::TryReserveError;
    fn find_max_slow(data: &[u32]) -> Result<Option<u32>, TryReserveError> {
        let mut heap = BinaryHeap::new();
        heap.try_reserve_exact(data.len())?;
        heap.extend(data.iter());
        Ok(heap.pop())
    }
    find_max_slow(&[1, 2, 3]).expect("why is the test harness OOMing on 12 bytes?");
}