1 // RUN: %clang_cc1 -std=c++1z -verify %s
2 
3 // no objects of an abstract class can be created except as subobjects of a
4 // class derived from it
5 
6 struct A {
7   A() {}
8   A(int) : A() {} // ok
9 
10   virtual void f() = 0; // expected-note 1+{{unimplemented}}
11 };
12 
13 void f(A &&a);
14 
15 void g() {
16   f({}); // expected-error {{abstract class}}
17   f({0}); // expected-error {{abstract class}}
18   f(0); // expected-error {{abstract class}}
19 }
20 
21 struct B : A {
22   B() : A() {} // ok
23 };
24