static boolean option_key(PsiBuilder b, int l) {
    if (!recursion_guard_(b, l, "option_key")) return false;
    if (!nextTokenIs(b, "", DOT, IDENTIFIER)) return false;
    boolean r;
    r = qualified_option_key(b, l + 1);
    if (!r) r = flat_option_key(b, l + 1);
    return r;
  }
static boolean option_key(PsiBuilder b, int l)