For example, original program:

    ```mlir
    module {
      func @while_body {
        %input = "tf.IteratorGetNext"(...) {device = "/CPU:0"}: -> tensor<2x224x224x3xf32>
        %device_launch = "tf_device.cluster_func"(%input,...) {func = @_func,...)
        return ...
      }

    ConfinedAttr<TF_ShapeAttrArray, [ArrayMinCount<1>]>:$output_shapes
  );

  let results = (outs
    Res<TF_ResourceTensor, [{A handle to the iterator that can be passed to a "MakeIterator" or
"IteratorGetNext" op. In contrast to Iterator, AnonymousIterator prevents
resource sharing by name, and does not keep a reference to the resource
container.}], [TF_DatasetIteratorAlloc]>:$handle
  );
}