fields_require_tracing.cpp:9:1: warning: [blink-gc] Class 'PartObject' has untraced fields that require tracing.
void PartObject::trace(Visitor* visitor) {
^
./fields_require_tracing.h:19:5: note: [blink-gc] Untraced field 'm_obj1' declared here:
    Member<HeapObject> m_obj1;
    ^
./fields_require_tracing.h:21:5: note: [blink-gc] Untraced field 'm_obj3' declared here:
    Member<HeapObject> m_obj3;
    ^
fields_require_tracing.cpp:15:1: warning: [blink-gc] Class 'HeapObject' has untraced fields that require tracing.
void HeapObject::trace(Visitor* visitor) {
^
./fields_require_tracing.h:28:5: note: [blink-gc] Untraced field 'm_part' declared here:
    PartObject m_part;
    ^
2 warnings generated.