Is this a compiler bug?

My compiler is VC++ 2005.

Could some wise soul please explain to me why the following code does
not work as I expect it to?

//Begin snippet

#include <iostream>
#include <tchar.h>

template<typename T>
void Test(const char *Name, const T &Func) {
  std::cout<<Name<<std::endl;
  Func();
}

template<typename T>
struct func {
  const T &_a;
  func(const T& A): _a(A) {}
  void operator()() const {
    std::cout<<"a="<<_a<<std::endl;
  }
};

struct int_func: func<int> {
  int_func(int a): func<int>(a) {}
};

int _tmain(int argc, _TCHAR* argv[]) {
  Test("using func", func<int>(42)); //writes 42 to cout
  Test("using int_func", int_func(42)); //writes random int to cout
  return 0;
}

//End snippet

Of course I could do this with a typedef but the real code is a bit
more complicated than this simple test case.

The temporary 'int_func' object seems to get created correctly, but as
soon as the constant "using int_func" then _a gets corrupted. Any
insights into what is going on here would be much appreciated.

--
Martin