static void printBenchResult(long repetitions) {
  printBenchResult(lastTiming(), repetitions);
}

static void printBenchResult(long time, long repetitions) {
  double secs = toSeconds(time)/repetitions;
  S s = n2(repetitions, "step") + ". Each step took: ";
  if (secs >= 1) ret with print(s + formatDouble(secs, 3) + " s");
  double ms = secs*1000;
  if (ms >= 1) ret with print(s + formatDouble(ms, 3) + " ms");
  double us = ms*1000;
  if (us >= 1) ret with print(s + formatDouble(us, 3) + " µs");
  double ns = us*1000;
  print(s + iround(ns) + " ns");
}