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