#![allow(unused_variables)]
fn main() {
    use std::collections::TryReserveError;
    use std::collections::VecDeque;
    fn process_data(data: &[u32]) -> Result<VecDeque<u32>, TryReserveError> {
        let mut output = VecDeque::new();
        output.try_reserve(data.len())?;
        output.extend(data.iter().map(|&val| { val * 2 + 5 }));
        Ok(output)
    }
    process_data(&[1, 2, 3]).expect("why is the test harness OOMing on 12 bytes?");
}