static LS tok_splitAtAnyOperator(S s) {

  ret tok_splitAtAnyOperator(javaTok(s));

}

static LS tok_splitAtAnyOperator(LS tok) {

  new LS l;

  int i = 1;

  while ping (i < l(tok)) {

    S t;

    int lastI = i, j = i;

    while (l(t = get(tok, j)) == 1 && !startsWithLetterOrDigit(t))

      j += 2;

    addIfNempty(l, trimJoinSubList(tok, i, j));

    i = j;

    while (j < l(tok) && !(l(t = get(tok, j)) == 1 && !startsWithLetterOrDigit(t)))

      j += 2;

    addIfNempty(l, trimJoinSubList(tok, i, j));

    i = j;

    assertTrue("safety", i > lastI);

  }

  ret l;

}