MSVC compilation failure on explicit variadic template function instantiation

Question

I've distilled my problem to a small example, pardon the macros. It seems a similar problem from this post is no longer an issue in VS and compiles fine. I believe I have a more specialized version of this problem that hasn't been fixed but want to make sure I'm not missing something. The following code compiles in GCC and runs expectedly, but gives error C2893 (Failed to specialize function template) in VS:

Macros.h:

#define If(x) \
  template<class T,class...Args, typename std::enable_if<std::is_same<T, x>::value>::type* = nullptr>
#define Do void Func(Args... args)

Definition.cpp:

#include <string>
#include <iostream>
#include "Macros.h"
using namespace std;


int answer  = 42;
double pie  = 3.14;
string s    = "Hello World";

// Function Definitions
If(int)    Do { cout << answer << endl; }
If(double) Do { cout << pie << endl; }
If(string) Do { cout << s << endl; }

// Explicit Instantiations
template void Func<int>(int, double, string);
template void Func<double>();
template void Func<string>();

Usage.cpp:

#include <string>
#include <type_traits>
#include "Macros.h"

// Template Function Declaration
If(T) Do;

int main() {
    using namespace std;
    Func<int>(5, 2.0, string("hello"));
    Func<double>();
    Func<string>();
}

As with the example in the other post it works correctly if the instantiations come from actual use in a function. Doing so is simple with this example but not so simple with my code.