)

var (
	// isListCache maintains a cache of types that are checked for lists
	// which is used by IsListType.
	// TODO: remove and replace with an interface check
	isListCache = struct {
		lock   sync.RWMutex
		byType map[reflect.Type]bool
	}{
		byType: make(map[reflect.Type]bool, 1024),
	}
)

// IsListType returns true if the provided Object has a slice called Items.

			return err
		}
		if info.Object == nil {
			return fn(info, nil)
		}
		if !meta.IsListType(info.Object) {
			return fn(info, nil)
		}

		items := []runtime.Object{}
		itemsToProcess := []runtime.Object{info.Object}

		for i := 0; i < len(itemsToProcess); i++ {
			currObj := itemsToProcess[i]
			if !meta.IsListType(currObj) {
				items = append(items, currObj)
				continue
			}

		return
	}

	// ensure that for empty lists we don't return <nil> items.
	// This is safe to modify without deep-copying the object, as
	// List objects themselves are never cached.
	if meta.IsListType(result) && meta.LenList(result) == 0 {
		if err := meta.SetList(result, []runtime.Object{}); err != nil {
			scope.err(err, w, req)
			return
		}
	}

	var obj runtime.Object
	do := func() {

func copyWithoutManagedFields(obj runtime.Object) (runtime.Object, bool, error) {
	isAccessor := true
	if _, err := meta.Accessor(obj); err != nil {
		isAccessor = false
	}
	isList := meta.IsListType(obj)
	_, isTable := obj.(*metav1.Table)
	if !isAccessor && !isList && !isTable {
		return nil, false, nil
	}

	// TODO a deep copy isn't really needed here, figure out how we can reliably

	tests := []struct {
		obj    runtime.Object
		isList bool
	}{
		{&testapigroup.CarpList{}, true},
		{&testapigroup.Carp{}, false},
	}
	for _, item := range tests {
		if e, a := item.isList, meta.IsListType(item.obj); e != a {
			t.Errorf("%v: Expected %v, got %v", reflect.TypeOf(item.obj), e, a)
		}
	}
}

func TestExtractList(t *testing.T) {
	list1 := []runtime.Object{

		Cells:  []interface{}{status.Status, status.Reason, status.Message},
	}}, nil
}

func printObjectMeta(obj runtime.Object, options PrintOptions) ([]metav1.TableRow, error) {
	if meta.IsListType(obj) {
		rows := make([]metav1.TableRow, 0, 16)
		err := meta.EachListItem(obj, func(obj runtime.Object) error {
			nestedRows, err := printObjectMeta(obj, options)
			if err != nil {
				return err
			}