ignore_class.cpp:14:1: warning: [blink-gc] Class 'C' has untraced fields that require tracing.
void C::trace(Visitor* visitor)
^
./ignore_class.h:35:5: note: [blink-gc] Untraced field 'm_obj' declared here:
    Member<HeapObject> m_obj;
    ^
1 warning generated.