inner_class.cpp:9:1: warning: [blink-gc] Class 'InnerObject' has untraced fields that require tracing.
void SomeObject::InnerObject::Trace(Visitor* visitor)
^
./inner_class.h:18:9: note: [blink-gc] Untraced field 'm_obj' declared here:
        Member<InnerObject> m_obj;
        ^
1 warning generated.