static <A, B> L<B> lambdaMapLike reallyLazyMap(IF1<A, B> f, L<A> l) {
  ret lazyMap_noSave(f, l);
}

static <A, B> L<B> reallyLazyMap(L<A> l, IF1<A, B> f) {
  ret lazyMap_noSave(f, l);
}