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   // So that W wouldn't have had "const W&" copy ctor if it were
8   // implicitly declared.
9   M(M&);
10 };
11 
12 template<typename T> struct W
13 {
14   W();
15   // This should now compile and be =deleted.
16   W(const W&) = default;
17   T t;
18 };
19 
20 W<M> w;
21