pkg sync/atomic, func CompareAndSwapUintptr(*uintptr, uintptr, uintptr) bool
pkg sync/atomic, func LoadInt32(*int32) int32
pkg sync/atomic, func LoadInt64(*int64) int64
pkg sync/atomic, func LoadPointer(*unsafe.Pointer) unsafe.Pointer
pkg sync/atomic, func LoadUint32(*uint32) uint32
pkg sync/atomic, func LoadUint64(*uint64) uint64
pkg sync/atomic, func LoadUintptr(*uintptr) uintptr

		return emptyStruct{}, i
	}
	v := ValueOf(f).Call(nil)[0] // out[0] should not alias out[1]'s memory, so the finalizer should run.
	timeout := time.After(5 * time.Second)
	for atomic.LoadUint32(&finalized) == 0 {
		select {
		case <-timeout:
			t.Fatal("finalizer did not run")
		default:
		}
		runtime.Gosched()
		runtime.GC()
	}
	runtime.KeepAlive(v)
}