[Bug c++/78065] incorrect behavior with std::is_same with nested class in a template class

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78065

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
If you use typedefs instead of alias declarations then all of GCC, Clang, EDG
and MSVC agree:

template<typename T>
struct foo
{
    typedef struct some_struct sub;
};

template<typename T>
struct bar
{
    typedef struct some_struct { } sub;
};

This declares a type ::some_struct and a temploid bar<T>::some_struct

So this is a bug in EDG and MSVC regarding alias-declarations at class scope.