1 // Testcase from P0136
2 // { dg-do compile { target c++11 } }
3 // { dg-options -fnew-inheriting-ctors }
4 
5 struct A { A(int); };
6 struct B : A { using A::A; };
7 
8 struct C1 : B { using B::B; };
9 struct C2 : B { using B::B; };
10 
11 struct D1 : C1, C2 {
12   using C1::C1;
13   using C2::C2;
14 };
15 
16 struct V1 : virtual B { using B::B; };
17 struct V2 : virtual B { using B::B; };
18 
19 struct D2 : V1, V2 {
20   using V1::V1;
21   using V2::V2;
22 };
23 
24 D1 d1(0); // { dg-error "" } ambiguous
25 D2 d2(0); // OK: initializes virtual B base class, which initializes the A base
26           // class then initializes the V1 and V2 base classes as if by a
27           // defaulted default constructor
28