auto& region = op->getRegion(region_idx);
  region.getArgument(0).replaceAllUsesWith(implicit_operand);
  region.front().eraseArguments(0, region.getNumArguments());
}

// Rewrites an `mhlo.if` op or its region. If `region_idx` is not set, the op
// operands and results are rewritten. If `region_idx` is set, region

import com.amazonaws.regions.RegionUtils
import com.amazonaws.regions.Regions
import com.amazonaws.services.s3.model.Region
import com.google.common.base.Optional
import spock.lang.Specification

import static com.amazonaws.regions.Region.getRegion

class S3RegionalResourceTest extends Specification {

    def "should determine the aws region from virtual hosted urls"() {
        expect:

  }

  // Returns if its legal to inline 'src' region into the 'dest' region
  // attached to a TF operation.
  bool isLegalToInline(Region *dest, Region *src, bool wouldBeCloned,
                       IRMapping &valueMapping) const final {
    // Allow inlining in regions attached to region based control flow
    // operations only if the src region is a single block region

         *
         * Lock file is {@link java.io.RandomAccessFile} that has two regions:
         * - lock state region, locked for the duration of the operation
         * - lock info region, locked just to write the lock info or read info from it
         * <br><br>
         *
         * Algorithm:<br>
         * 1. We first try to acquire a lock on the state region with retries, see {@link #lockStateRegion(LockMode)}.<br>

	LabelTopologyRegion  = "topology.kubernetes.io/region"
)

// AugmentLabels adds additional labels to the those provided.
func AugmentLabels(in labels.Instance, clusterID cluster.ID, locality, k8sNode string, networkID network.ID) labels.Instance {
	// Copy the original labels to a new map.
	out := make(labels.Instance, len(in)+6)
	for k, v := range in {
		out[k] = v
	}

	region, zone, subzone := SplitLocalityLabel(locality)

    --project "${PROJECT}" \
    --region "${REGION}" \
    --protocol tcp \
    --region "${REGION}" \
    --load-balancing-scheme internal \
    --health-checks "${MASTER_NAME}-hc"

  gcloud compute forwarding-rules create "${MASTER_NAME}-internal" \
    --project "${PROJECT}" \
    --region "${REGION}" \
    --load-balancing-scheme internal \
    --network "${NETWORK}" \

  // Remove the original TPUExecute op.
  execute_launch.erase();

  // Move all regions from old parallel_execute to new parallel_execute.
  for (auto region : llvm::zip(new_parallel_execute_op->getRegions(),
                               parallel_execute_op->getRegions()))
    std::get<0>(region).takeBody(std::get<1>(region));

  // Remove the original parallel_execute.
  parallel_execute_op->dropAllUses();

  SymbolUserMap symbol_map(table, module);

  // Regions that contains ops requiring token input attributes.
  absl::flat_hash_set<Region*> regions_with_token;
  while (!worklist.empty()) {
    Operation* op = worklist.back();
    worklist.pop_back();

    Region* region = op->getParentRegion();
    regions_with_token.insert(region);

  }

  // Checks if a region only consists of ops that are quantizable in a nested
  // region.
  // tf.CustomAggregator op cannot be inserted into region of a StableHLO op,
  // thus calibration is impossible within a nested region. Therefore, when an
  // op involves a region, the op is only quantizable when the region only
  // consists of ops whose quantization parameters can be propagated from

  return 0;
}

void MoveTpuCompileToFrontPass::runOnOperation() {
  MarkCompilationOps(getOperation());
  getOperation().walk([](Operation* op) {
    for (Region& region : op->getRegions()) {
      for (Block& block : region.getBlocks()) {
        if (block.empty()) continue;
        auto ops = SortBlockTopologically(block, OutsideCompilationOrdering);
        // Replace the block with the reordered block.