[Bug c++/80670] Member specialization of alias declaration from different namespace

[rs2740 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80670

TC <rs2740 at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rs2740 at gmail dot com

--- Comment #2 from TC <rs2740 at gmail dot com> ---
namespace A {
    template<class> class X { struct P; };
}

namespace B {
    using Y = A::X<int>;
}

namespace A {
    template<> struct B::Y::P {};
}

main.cpp:10:29: error: declaration of 'struct A::X<int>::P' in namespace 'A'
which does not enclose 'using Y = class A::X<int>'
     template<> struct B::Y::P {};