static boolean paren_list(PsiBuilder b, int l, Parser _item) {
    if (!recursion_guard_(b, l, "paren_list")) return false;
    if (!nextTokenIs(b, T_LPAREN)) return false;
    boolean r;
    Marker m = enter_section_(b);
    r = empty_parens(b, l + 1);
    if (!r) r = paren_list_1(b, l + 1, _item);
    exit_section_(b, m, null, r);
    return r;
  }
static boolean paren_list(PsiBuilder b, int l, Parser _item)