range_not_long_enough.rs

fn cluster(trimmed: i64) {
    let range: Vec<i64> = (0..trimmed + 1).collect();
    range.par_iter()
        .map(|i| thread::spawn(move || run(i.to_le())))
        .map(|runner| runner.join());
}

Back to the original way

    let mut runners = vec![];

    for i in 0..trimmed + 1 {
        let runner = thread::spawn(move || run(i));
        runners.push(runner);
    }

    for runner in runners {
        &runner.join();
    }