Function parse_experiment

libs/error-stack/examples/demo.rs:23–49

(description: &str)

    reason = "false-positive, try_fold is fail-fast, our implementation is fail-slow"
)]
fn parse_experiment(description: &str) -> Result<Vec<(u64, u64)>, Report<ParseExperimentError>> {
    let values = description
        .split(' ')
        .map(|value| {
            value
                .parse::<u64>()
                .attach_with(|| format!("{value:?} could not be parsed as experiment"))
        })
        .map(|value| value.map(|ok| (ok, 2 * ok)))
        .fold(Ok(vec![]), |accum, value| match (accum, value) {
            (Ok(mut accum), Ok(value)) => {
                accum.push(value);

                Ok(accum)
            }
            (Ok(_), Err(err)) => Err(err.expand()),
            (Err(accum), Ok(_)) => Err(accum),
            (Err(mut accum), Err(err)) => {
                accum.push(err);

                Err(accum)
            }
        })
        .change_context(ParseExperimentError)?;

    Ok(values)
}

#[derive(Debug)]
struct ExperimentError;