[Bug c++/86823] [6/7/8/9 Regression] private member template struct/class is publicly accessible

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86823

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Confirmed by commenting out the two:
  tentative_firewall firewall (parser);
lines and the testcase is rejected again.