Vs crash, template function virtual

In debug mode, VS 2010,

#include <iostream>
using namespace std;
template<typename T,void (T::*m)(int)>
    struct B{

    void f(T* a,int x){
        (a->*m)(x);
    }
};



struct A{


   virtual void v(int){}
   B<A,&v> b;


};


int main(){
   A a;
 
}

This code crashes. Remove the virtual, it will compile