fields_require_tracing.cpp:9:1: warning: [blink-gc] Class 'PartObject' has untraced fields that require tracing.
void PartObject::Trace(Visitor* visitor) const {
^
./fields_require_tracing.h:31:5: note: [blink-gc] Untraced field 'm_obj1' declared here:
    Member<HeapObject> m_obj1;
    ^
./fields_require_tracing.h:33:5: note: [blink-gc] Untraced field 'm_obj3' declared here:
    Member<HeapObject> m_obj3;
    ^
fields_require_tracing.cpp:16:1: warning: [blink-gc] Class 'PartBObject' has untraced fields that require tracing.
void PartBObject::Trace(Visitor* visitor) const {
^
./fields_require_tracing.h:21:5: note: [blink-gc] Untraced field 'm_set' declared here:
    HeapHashSet<PartBObject> m_set;
    ^
fields_require_tracing.cpp:21:1: warning: [blink-gc] Class 'HeapObject' has untraced fields that require tracing.
void HeapObject::Trace(Visitor* visitor) const {
^
./fields_require_tracing.h:43:5: note: [blink-gc] Untraced field 'm_part' declared here:
    PartObject m_part;
    ^
3 warnings generated.