static AlphanumComparator alphaNumComparatorIC_instance;

static Comparator<S> alphaNumComparatorIC() {
  if (alphaNumComparatorIC_instance == null) {
    new AlphanumComparator ac;
    ac.ignoreCase = true;
    alphaNumComparatorIC_instance = ac;
  }
  ret alphaNumComparatorIC_instance;
}

Began life as a copy of #1017303