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#include <iostream>
 
namespace N {
	class C {};
 
	template<typename X>
	char const * found(X && x) {
		return "found";
	}
 
	template<typename, typename X>
	char const * notfound(X && x) {
		return "not found";
	}
}
 
int main() {
	N::C object;
	std::cout
		<< found(object) << std::endl
		<< notfound<bool>(object) << std::endl
		<< notfound<bool, N::C>(object) << std::endl;
}

prog.cpp: In function ‘int main()’:
prog.cpp:21:6: error: ‘notfound’ was not declared in this scope
   << notfound<bool>(object) << std::endl
      ^~~~~~~~
prog.cpp:21:6: note: suggested alternative:
prog.cpp:12:15: note:   ‘N::notfound’
  char const * notfound(X && x) {
               ^~~~~~~~
prog.cpp:21:15: error: expected primary-expression before ‘bool’
   << notfound<bool>(object) << std::endl
               ^~~~

Standard output is empty