https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78065
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This shows that the alias declaration declares some_struct in the enclosing
namespace:
template<typename T>
struct foo
{
using sub = struct some_struct;
};
some_struct s;
All of EDG, GCC and Clang say that some_struct is incomplete at that point,
which means they all (correctly, I believe) add it to the enclosing namespace.
So MSVC is wrong to treat foo<int>::sub and foo<double>::sub as distinct types,
they both refer to ::some_struct
EDG seems to also add bar<T>::some_struct to the enclosing namespace, which I
think is wrong.
