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#include <iostream>
using namespace std;
 
template <class T>
struct test1 {
	enum test2 {
		test3, test4
	};
};
 
template <class T>
typename test1<T>::test2 operator | (typename test1<T>::test2 f1, typename test1<T>::test2 f2) {
	return static_cast<typename test1<T>::test2>(
		static_cast<unsigned>(f1) | static_cast<unsigned>(f2)
	);
}
 
int main() {
	test1<int>::test2 flags = test1<int>::test3 | test1<int>::test4;
}

prog.cpp: In function 'int main()':
prog.cpp:19:60: error: invalid conversion from 'int' to 'test1<int>::test2' [-fpermissive]
  test1<int>::test2 flags = test1<int>::test3 | test1<int>::test4;
                                                            ^

Standard output is empty