#![allow(unused_variables)]
fn main() {
    use std::collections::TryReserveError;
    fn process_data(data: &str) -> Result<String, TryReserveError> {
        let mut output = String::new();
        output.try_reserve(data.len())?;
        output.push_str(data);
        Ok(output)
    }
    process_data("rust").expect("why is the test harness OOMing on 4 bytes?");
}