// Create empty then branch region.
  auto& then_branch = host_side_if.getThenBranch();
  then_branch.push_back(new Block);
  builder.setInsertionPointToEnd(&then_branch.front());
  builder.create<mlir::TF::YieldOp>(if_region.getLoc(),
                                    /*operands=*/ArrayRef<Value>{});

  // Create empty else branch region.
  auto& else_branch = host_side_if.getElseBranch();

  // regions attached to the op's in the block.
  if (metadata_map.empty()) {
    for (Operation& op : *block) {
      for (Region& region : op.getRegions()) {
        if (!llvm::hasSingleElement(region))
          return op.emitOpError("Expected single block region");
        if (failed(FormClustersInBlock(&region.front(), side_effect_analysis,

    OptionalAttr<DictArrayAttr>:$res_attrs
  );

  let results = (outs);

  // When the regions is empty, the tfr.func is an external function and used
  // to model the element type constraints of the tf op. Otherwise, there is one
  // region containing the composition.
  let regions = (region VariadicRegion<AnyRegion>:$body);

  let skipDefaultBuilders = 1;

  let builders = [

		})
		var lastTimestamp trace.Time
		var n int
		// Select only the outermost regions.
		for _, i := range intervals {
			if lastTimestamp <= i.start {
				intervals[n] = i // new non-overlapping region starts.
				lastTimestamp = i.end
				n++
			}
			// Otherwise, skip because this region overlaps with a previous region.
		}
		gToIntervals[g] = intervals[:n]
	}
	return gToIntervals, nil
}

  // Build a subgraph with a given name out of the region either corresponding
  // to a function's body or while op. Modifies *region by calling
  // ExtractControlEdges.
  std::optional<BufferOffset<tflite::SubGraph>> BuildSubGraph(
      const std::string& name, Region* region, int index);

  // Modifies *block by unwrapping all ControlNodeOps. The DAG of the control

		{
			name: "invalid LocalityLoadBalancerSetting specify both failoverPriority and region in failover",
			in: &networking.LocalityLoadBalancerSetting{
				Failover: []*networking.LocalityLoadBalancerSetting_Failover{
					{
						From: "region1",
						To:   "region2",
					},
				},
				FailoverPriority: []string{"topology.kubernetes.io/region"},
			},
			outlier: &networking.OutlierDetection{},
			err:     true,

 * different types of failures.
 */
class ResolutionFailureHandlerIntegrationTest extends AbstractIntegrationSpec {
    // region resolution failures
    // region Graph Variant failures
    def "demonstrate ambiguous graph variant selection failure with single disambiguating value for project"() {
        ambiguousGraphVariantForProjectWithSingleDisambiguatingAttribute.prepare()

// Sinks `tf.Const` operations in the ClusterOp region using them. This is
// performed in order to limit the number of values implicitly captured in this
// region before outlining.
std::unique_ptr<OperationPass<func::FuncOp>> CreateClusterConstantSinkingPass(
    llvm::function_ref<bool(tf_device::ClusterOp, ElementsAttr)> filter = {});

// Creates a pass that outlines regions of tf_device.cluster operations.

  unformat_operands.append(replicated_block_args.begin(),
                           replicated_block_args.end());
  unformat_operands.append(packed_block_args.begin(), packed_block_args.end());
  unformat_operands.push_back(state);

  // Insert the default key as the second last operand.
  unformat_operands.insert(
      unformat_operands.begin() + unformat_operands.size() - 1,
      default_state_key.getResult());

	ntype := strings.Split(value, "~")[0]
	return newOption("nodeType", ntype)
}

func XdsType(value string) Instance {
	return newOption("xds_type", value)
}

func Region(value string) Instance {
	return newOptionOrSkipIfZero("region", value)
}

func Zone(value string) Instance {
	return newOptionOrSkipIfZero("zone", value)
}

func SubZone(value string) Instance {