// out: func(L<S> tok, int cIndex) -> S
// condition: func(L<S> tok, int nIndex) -> S  [yeah it's inconsistent]
sbool jreplace_dyn_allowDollarRefs(LS tok, S in, IF1<Int, S> out) {
  ret jreplace_dyn(tok, in, (_tok, cIdx) -> {
    S replacement = out.get(cIdx);
    LS subList = subList(tok, cIdx-1); // N to N
    ret jreplaceExpandRefs(replacement, subList);
  });
}