Visual C++ does not handle based enums correctly by Alf P. Steinbach, except MS doesn't accept it

Up to and including Visual C++ 11 (I only have the preview of that compiler) the following code fails to compile:

#ifdef _MSC_VER
# pragma warning( disable: 4480 )     // enum base as "nonstandard extension"
#endif
enum ShouldBeFine: char { hola };

enum Choice { a, b, c };

template< Choice c > struct Traits;

template<> struct Traits<a> { typedef char Type; };
template<> struct Traits<b> { typedef wchar_t Type; };
template<> struct Traits<c> { typedef long Type; };

template< Choice c >
struct Blah
{
    enum X: typename Traits<c>::Type {};
};

int main()
{}