svoid tok_questionDot(LS tok) {
  jreplace(tok, "<id> ?.", "if ($1 != null) $1.");
  /*int i;
  while ((i = jfind(tok, "<id> ?.")) {
    S var = tok.get(i);
    int j = findEndOfStatement(tok, i);
    int dot = indexOf(tok, i, ".");
    tok.set(i+2, "");
    bool isExpression = eqGetOneOf(tok, i-2, "ret", "return"); // just one case so far
    replaceTokens(tok, i, dot+1,
      isExpression
        ? "\*var*/ == null ? null : \*var*/."
        : "if (" + var + " != null) var.");
  }*/
}