In file included from ref_ptr_to_gc_managed_class.cpp:5:
./ref_ptr_to_gc_managed_class.h:14:1: warning: [blink-gc] Class 'PartObject' contains invalid fields.
class PartObject {
^
./ref_ptr_to_gc_managed_class.h:17:5: note: [blink-gc] RefPtr field 'm_obj' to a GC managed class declared here:
    RefPtr<HeapObject> m_obj;
    ^
./ref_ptr_to_gc_managed_class.h:20:1: warning: [blink-gc] Class 'HeapObject' contains invalid fields.
class HeapObject : public GarbageCollectedFinalized<HeapObject> {
^
./ref_ptr_to_gc_managed_class.h:25:5: note: [blink-gc] RefPtr field 'm_objs' to a GC managed class declared here:
    Vector<RefPtr<HeapObject> > m_objs;
    ^
2 warnings generated.