// doesn't perform any sanity checks...
// and this is NL-level, not SNL.
static Lisp snlJoinOps(L<Lisp> ops) {
  Lisp t = lisp("[]");
  for (Lisp op : ops) {
    int i = op.head.indexOf(' ');
    t.add(lisp(substring(op.head, 0, i)));
    t.add(op.get(0));
  }
  ret t;
}