static <A> A third(L<A> l) {
  return _get(l, 2);
}

static <A> A third(A[] bla) {
  ret bla == null || bla.length <= 2 ? null : bla[2];
}

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