Non-standard partial ordering of variadic template partial specialization

The compiler fails to compile an example from C++14 Section 14.8.2.5 paragraph 9. The code has been adapted with a self-check below:

template<class T, class... U> struct A
{ static constexpr bool f()

{ return false; } }; // #1

template<class T1, class T2, class... U> struct A<T1, T2*, U...>
{ static constexpr bool f() { return true; } }; // #2

template<class T1, class T2> struct A<T1, T2>
{ static constexpr bool f() { return false; }

}; // #3

using x = A<int, int*>; // selects #2
static_assert(x::f(), "Whoops!");