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#include <iostream>
#include <vector>
using namespace std;
 
int main() {
	vector<bool> vec({false, false, true, false});
 
	bool &some_bool = vec[2];
	some_bool = false;
	cout << vec[2] << '\n';
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:8:25: error: invalid initialization of non-const reference of type ‘bool&’ from an rvalue of type ‘bool’
  bool &some_bool = vec[2];
                    ~~~~~^
In file included from /usr/include/c++/6/vector:65:0,
                 from prog.cpp:2:
/usr/include/c++/6/bits/stl_bvector.h:80:5: note:   after user-defined conversion: std::_Bit_reference::operator bool() const
     operator bool() const _GLIBCXX_NOEXCEPT
     ^~~~~~~~

Standard output is empty