static <A> L<A> mapMethodLike filterByMethod(Collection<A> c, S method) {
  new L<A> l;
  for (A x : c)
    if (booleanValue(call(x, method)))
      l.add(x);
  ret l;
}

static <A> L<A> mapMethodLike filterByMethod(S method, Collection<A> c) {
  ret filterByMethod(c, method);
}