static <A> A foldr_noSeed(F2<A, A, A> f, Cl<A> l) {
  ret foldr_noSeed((O) f, l);
}

static <A> A curry1Like foldr_noSeed(IF2<A, A, A> f, Cl<A> l) {
  ret foldr_noSeed((O) f, l);
}

static <A> A foldr_noSeed(O f, Cl<A> l) {
  Iterator<A> it = reversedIterator(asList(l));
  if (!it.hasNext()) null;
  A a = it.next();
  while (it.hasNext())
    a = (A) callF(f, it.next(), a);
  ret a;
}

Began life as a copy of #1017064