trace_after_dispatch.cpp:11:1: warning: [blink-gc] Missing dispatch to class 'D' in manual trace dispatch. void A::Trace(Visitor* visitor) ^ trace_after_dispatch.cpp:30:1: warning: [blink-gc] Base class 'A' of derived class 'B' requires tracing. void B::TraceAfterDispatch(Visitor* visitor) ^ trace_after_dispatch.cpp:38:1: warning: [blink-gc] Class 'C' has untraced fields that require tracing. void C::TraceAfterDispatch(Visitor* visitor) ^ ./trace_after_dispatch.h:36:5: note: [blink-gc] Untraced field 'm_a' declared here: Member m_a; ^ 3 warnings generated.