compiler bug with templates, VC++2005

c:\documents and settings\niall\my documents\visual studio 2005\projects\test\test\test.cpp(23) : warning C4267: 'argument' : conversion from 'size_t' to 'unsigned int', possible loss of data


void test(size_t x, unsigned int y)
{
}

template<typename T>
struct Traits
{
 typedef T Parameter;
};

template<typename A, typename B>
class Functor
{
public:
 typedef typename Traits<A>::Parameter Parm1;
 typedef typename Traits<B>::Parameter Parm2;
 void go(Parm1 p1, Parm2 p2) { test(p1,p2); }
};

void run()
{
 size_t x = 100;
 unsigned int y = 200;

 Functor<size_t, unsigned int> f;
 f.go(x,y); //compiler warning on this line!
}