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#include <iostream>
#include <stdint.h>
 
template <typename T>
union test
{
	using mytype = T;
    friend std::ostream& operator<<(std::ostream& stream, test<T> t)
    {
    	stream << static_cast<mytype>(65);
    }
};
 
int main() {
	test<int> t;
	std::cout << t;
	return 0;
}
 

prog.cpp: In function ‘std::ostream& operator<<(std::ostream&, test)’:
prog.cpp:10:28: error: ‘mytype’ does not name a type
      stream << static_cast<mytype>(65);
                            ^~~~~~
prog.cpp: In function ‘int main()’:
prog.cpp:15:10: error: non-template type ‘test’ used as a template
  test<int> t;
          ^

Standard output is empty