code: @CanIgnoreReturnValue
    public static boolean removeAll(Iterator<?> removeFrom, Collection<?> elementsToRemove) {
      return removeIf(removeFrom, in(elementsToRemove));
    }
docs: Traverses an iterator and removes every element that belongs to the
  provided collection. The iterator will be left exhausted: its
  {@code hasNext()} method will return {@code false}.
  
  @param removeFrom the iterator to (potentially) remove elements from
  @param elementsToRemove the elements to remove
  @return {@code true} if any element was removed from {@code iterator}