1 // Core Issue #1331 (const mismatch with defaulted copy constructor) 2 // { dg-do compile { target c++11 } } 3 4 struct M 5 { 6 M(); 7 M(M&); 8 }; 9 10 template<typename T> struct W 11 { 12 W(); 13 W(W&) = default; 14 // T1 and T2 may have differing ref-qualifiers (copy assign op). 15 constexpr W& operator=(const W&) && = default; // { dg-error "defaulted" "" { target c++11_down } } 16 T t; 17 }; 18 19 W<M> w; 20