In file included from class_overrides_new.cpp:5:
./class_overrides_new.h:13:5: warning: [blink-gc] Garbage collected class 'HeapObject' is not permitted to override its new operator.
    WTF_MAKE_FAST_ALLOCATED;
    ^
./heap/stubs.h:14:5: note: expanded from macro 'WTF_MAKE_FAST_ALLOCATED'
    void* operator new(size_t size);            \
    ^
1 warning generated.