1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #include "base_requires_tracing.h"
6 
7 namespace blink {
8 
trace(Visitor * visitor)9 void A::trace(Visitor* visitor) { }
10 
trace(Visitor * visitor)11 void C::trace(Visitor* visitor) {
12   visitor->trace(m_a);
13   // Missing B::trace(visitor)
14 }
15 
trace(Visitor * visitor)16 void D::trace(Visitor* visitor) {
17   visitor->trace(m_a);
18   C::trace(visitor);
19 }
20 
21 }
22