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template <template <typename...> class Template, int Exp, typename T>
struct pow {
    typedef Template<typename pow<Template, Exp-1, T>::type> type;
};
 
template <template <typename...> class Template, typename T>
struct pow<Template, 0, T> {
    typedef T type;
};
 
template <typename>
struct shared_ptr {};
 
template <typename> struct show;
 
int main() {
    show<typename pow<shared_ptr, 10, int>::type> _;
}
 

prog.cpp: In function 'int main()':
prog.cpp:17:51: error: aggregate 'show<shared_ptr<shared_ptr<shared_ptr<shared_ptr<shared_ptr<shared_ptr<shared_ptr<shared_ptr<shared_ptr<shared_ptr<int> > > > > > > > > > > _' has incomplete type and cannot be defined

Standard output is empty