ignore_fields.cpp:9:1: warning: [blink-gc] Class 'C' has untraced fields that require tracing.
void C::trace(Visitor* visitor)
^
./ignore_fields.h:36:5: note: [blink-gc] Untraced field 'm_one' declared here:
    Member<HeapObject> m_one;
    ^
1 warning generated.