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#include <iostream>
#include <functional>
using namespace std;
template<typename T, typename F>
class Test {
	public:
	T hello;
	F& _func;
	Test() {
	}
};
 
void print() {
 cout << "lol";	
}
int main() {
	Test <int, std::function<void>> t;
	return 0;
}

prog.cpp: In instantiation of ‘Test<T, F>::Test() [with T = int; F = std::function<void>]’:
prog.cpp:17:34:   required from here
prog.cpp:9:2: error: uninitialized reference member in ‘class std::function<void>&’ [-fpermissive]
  Test() {
  ^~~~
prog.cpp:8:5: note: ‘std::function<void>& Test<int, std::function<void> >::_func’ should be initialized
  F& _func;
     ^~~~~

Standard output is empty