svoid tok_questionDot(LS tok) {
  jreplace_dyn(tok, "<id> ?.",
    func(L<S> tok, int i) -> S {
      S var = tok.get(i);
      bool isExpression = eqGetOneOf(tok, i-2, "ret", "return", ",", "=", "("); // too few
      ret isExpression
        ? "\*var*/ == null ? null : \*var*/."
        : "if (\*var*/ != null) \*var*/.";
    });
}