static SS ai_operands_upperCaseVars(S operator, S s) {
  ret ai_operands_upperCaseVars(javaTokC(operator), s);
}

static SS ai_operands_upperCaseVars(L<S> operator, S s) {
  L<S> tok = javaTokPlusBracketsC_unquote(s);
  assertSameLength(operator, tok);
  new SS operands;
  for i over operator: {
    S t = operator.get(i);
    if (isUpperCaseVar(t))
      operands.put(t, tok.get(i));
  }
  ret operands;
}