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.
5 #include "base_requires_tracing.h"
9 void A::trace(Visitor
* visitor
) { }
11 void C::trace(Visitor
* visitor
) {
13 // Missing B::trace(visitor)
16 void D::trace(Visitor
* visitor
) {