In file included from stack_allocated.cpp:5:
./stack_allocated.h:14:1: warning: [blink-gc] Class 'PartObject' requires a trace method.
class PartObject {
^
./stack_allocated.h:17:5: note: [blink-gc] Untraced field 'm_obj' declared here:
    Member<HeapObject> m_obj; // Needs tracing.
    ^
./stack_allocated.h:26:28: warning: [blink-gc] Stack-allocated class 'AnotherStackObject' derives class 'PartObject' which is not stack allocated.
class AnotherStackObject : public PartObject { // Invalid base.
                           ^
./stack_allocated.h:32:1: warning: [blink-gc] Class 'HeapObject' contains invalid fields.
class HeapObject : public GarbageCollected<HeapObject> {
^
./stack_allocated.h:36:5: note: [blink-gc] Stack-allocated field 'm_part' declared here:
    StackObject m_part; // Cannot embed a stack allocated object.
    ^
stack_allocated.cpp:12:1: warning: [blink-gc] Class 'AnonStackObject' contains invalid fields.
class AnonStackObject : public StackObject {
^
stack_allocated.cpp:14:5: note: [blink-gc] Raw pointer field 'm_obj' to a GC managed class declared here:
    HeapObject* m_obj;
    ^
4 warnings generated.