// 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);
}
}