static <A> A second(L<A> l) {
  return get(l, 1);
}

static <A> A second(Iterable<A> l) {
  if (l == null) null;
  Iterator<A> it = iterator(l);
  if (!it.hasNext()) null;
  it.next();
  ret it.hasNext() ? it.next() : null;
}

static <A> A second(A[] bla) {
  ret bla == null || bla.length <= 1 ? null : bla[1];
}

ifclass Pair
static <A, B> B second(Pair<A, B> p) {
  ret p == null ? null : p.b;
}
endif

ifclass T3
static <A, B, C> B second(T3<A, B, C> t) {
  ret t == null ? null : t.b;
}
endif

ifclass Producer
static <A> A second(Producer<A> p) {
  if (p == null) null;
  if (p.next() == null) null;
  ret p.next();
}
endif

static char second(S s) {
  ret charAt(s, 1);
}

ifclass Either
static <A, B> B second(Either<A, B> e) {
  ret e == null ? null : e.bOpt();
}
endif