impl Run {
/// Create a new `Run`.
pub fn new(run_dir: &Path, run_id: RunId) -> Result<Self, RunError> {
let run_log_filename = run_dir.join(format!("{}", run_id));
let run_log_filename = run_dir.join("log.html");
let run_log = RunLog::new(&run_log_filename);
Ok(Self {