[Bug c++/124604] [C++20] cp_preserve_using_decl = true causes parse errors in libstdc++

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124604

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Also we are going to remove cp_preserve_using_decl  in later versions of GCC,
see PR 124169 .