static <A, B extends A> void _addAll(Collection<A> c, Iterable<B> b) {
  addAll(c, b);
}



static <A, B extends A> bool _addAll(Collection<A> c, Collection<B> b) {
  ret addAll(c, b);
}



static <A, B extends A> bool _addAll(Collection<A> c, B... b) {
  ret addAll(c, b);
}