static boolean type_parameters(PsiBuilder b, int l) {
    if (!recursion_guard_(b, l, "type_parameters")) return false;
    if (!nextTokenIs(b, IDENTIFIER)) return false;
    boolean r;
    Marker m = enter_section_(b);
    r = type_parameter(b, l + 1);
    r = r && type_parameters_1(b, l + 1);
    exit_section_(b, m, null, r);
    return r;
  }
static boolean type_parameters(PsiBuilder b, int l)