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#include <iostream>
using namespace std;
 
class String { };
template<class T> class Array { /* ... */ };
template<class T> void sort(Array<T>& v) { /* ... */ }
 
//template<> void sort<String>(Array<String>& v)    {}
void f(Array<String>& v) {
  sort(v);          // use primary template sort(Array<T>&), T is String
}
 
template<> void sort<String>(Array<String>& v)    {}
template<> void sort<>(Array<char*>& v)       {}
 
int main() {
	// your code goes here
	return 0;
}

prog.cpp:13:46: error: specialization of ‘void sort(Array<T>&) [with T = String]’ after instantiation
 template<> void sort<String>(Array<String>& v)    {}
                                              ^

Standard output is empty