sclass RunResultWithTimestamps<A> {
  settable Timestamp started;
  settable Timestamp ended;
  settable OKOrError<A> result;
  settable CharSequence printOutput;
  
  selfType run(IF0<A> f) {
    ret setPrintOutput(hijackPrint_tee(r {
      started(tsNow());
      result(okOrError(f));
      ended(tsNow());
    }));
  }
  
  A get() { ret result!!; }
}