static <A, B extends A> Set<B> antiFilterToSet(Iterable<B> c, IPred<A> pred) {
  Set<B> x = similarEmptySet(c);
  if (c != null) for (B o : c)
    if (!pred.get(o))
      x.add(o);
  ret x;
}

static <A, B extends A> Set<B> antiFilterToSet(IPred<A> pred, Iterable<B> c) {
  ret antiFilterToSet(c, pred);
}

Began life as a copy of #1017203