1 // PR c++/78890 2 // { dg-do compile { target c++11 } } 3 4 int main()5 main() 6 { 7 union { 8 int a; 9 int &b = a; // { dg-error "may not have reference type" } 10 }; 11 a = 1; 12 auto c = b + 1; 13 } 14