static Pair<LS, O> prepareEvalWithDollarVars(S code) {
  ret prepareEvalWithDollarVars(code, tok_dollarVarTokens(javaTok(code)));
}
  
static Pair<LS, O> prepareEvalWithDollarVars(S code, Set<S> vars) {
  temp tempSetThreadLocal(evalJava_prep_args, joinWithComma(map(func(S var) -> S { "S " + var }, vars)));
  S src = evalJava_prep(code);
  O c = evalJava_prep2(src);
  ret pair((L<S>) asList(vars), c);
}