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c++.beta - template template parameter issue 2

I'm not very sure following code is legal, but seems to be!

namespace NS{
 template <typename ONE>
 class some{

template <template <class> class TT, class T = int>
struct RealUse{
 typedef TT<T> type; // the reason I use template template parameter

int main(int argc, char *argv[])

 RealUse<NS::some> a; //error

 //this code work
 use NS::some;
 RealUse<some> a;

 return 0;
Oct 06 2003