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#include <iostream>
using namespace std;
 
struct Beta_ab { int a; };
 
struct Beta {
  Beta_ab ab;
  Beta_ab && getAB() && { cout << "1"; return move(ab); }
  Beta_ab && getAB() { cout << "2"; return move(ab); }
};
 
int main() {
	Beta b;
	Beta_ab ab1 = b.getAB();
 
	Beta_ab ab2 = Beta().getAB();
 
	return 0;
}

prog.cpp:9:14: error: ‘Beta_ab&& Beta::getAB()’ cannot be overloaded
   Beta_ab && getAB() { cout << "2"; return move(ab); }
              ^~~~~
prog.cpp:8:14: error: with ‘Beta_ab&& Beta::getAB() &&’
   Beta_ab && getAB() && { cout << "1"; return move(ab); }
              ^~~~~
prog.cpp: In function ‘int main()’:
prog.cpp:14:24: error: passing ‘Beta’ as ‘this’ argument discards qualifiers [-fpermissive]
  Beta_ab ab1 = b.getAB();
                        ^
prog.cpp:8:14: note:   in call to ‘Beta_ab&& Beta::getAB() &&’
   Beta_ab && getAB() && { cout << "1"; return move(ab); }
              ^~~~~

Standard output is empty