是VC6.0太弱了，还是我的代码太弱了？

全部代码如下，运行时出错？为何?谢谢

#include <iostream>
#include <vector>

class Test
{
public:
int *data;
static int counter;

Test()
{
data = new int[5];
std::cout << "Test constructor." << ++counter << "\n";
}

~Test()
{
delete [] data;
std::cout << "Test destructor." << counter << "\n";
}

Test& operator = (Test const& tt)
{
//delete [] data;
//data = new int[5];
std::cout << "assignment operator\n";
return *this;
}
};
int Test::counter = 0;

int main()
{
std::vector<Test> vec(8);
return 0;
}