// Copyright 2014 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include "base_requires_tracing.h" namespace WebCore { void A::trace(Visitor* visitor) { } void C::trace(Visitor* visitor) { visitor->trace(m_a); // Missing B::trace(visitor) } void D::trace(Visitor* visitor) { visitor->trace(m_a); C::trace(visitor); } }