"only memory regions");

  if (ops->data == nullptr)
    return errors::FailedPrecondition(
        "Trying to register filesystem without `data` operation on read only "
        "memory regions");

  if (ops->length == nullptr)
    return errors::FailedPrecondition(
        "Trying to register filesystem without `length` operation on read only "

            if (!testCaseRegions.containsKey(testId)) {
                TestCaseRegion region = new TestCaseRegion();
                testCaseRegions.put(testId, region);
            }

            TestCaseRegion region = testCaseRegions.get(testId);

            Region streamRegion = isStdout ? region.stdOutRegion : region.stdErrRegion;

            long total = output.getWritePosition();

			t.Errorf("wanted region start event %s, got %s", wantStart, kind)
		}
		if kind == trace.EventRegionBegin {
			if region.Start.Region().Type != region.Name {
				t.Errorf("region name mismatch: event has %s, summary has %s", region.Start.Region().Type, region.Name)
			}
		} else {
			st := region.Start.StateTransition()
			if st.Resource.Kind != trace.ResourceGoroutine {

  ParallelExecuteOp op = *this;
  const auto& regions = op.getOperation()->getRegions();
  if (regions.empty()) {
    return op.emitOpError() << "must have at least one region.";
  }

  int output_index = 0;
  for (const auto& region_and_index : llvm::enumerate(regions)) {
    auto& region = region_and_index.value();
    auto* region_terminator = region.front().getTerminator();

	if region.Start != nil {
		startStack = region.Start.Stack()
		startTime = region.Start.Time()
		goroutine = region.Start.Goroutine()
	}
	if region.End != nil {
		endStack = region.End.Stack()
		endTime = region.End.Time()
		goroutine = region.End.Goroutine()
	}
	if goroutine == trace.NoGoroutine {
		return
	}
	arg := struct {
		TaskID uint64 `json:"taskid"`
	}{

    // Update the regions. The dialect conversion framework wants new regions to
    // be created and updated, rather than updating the old op. Thus we use an
    // OperationState so we can add regions to the new up.
    OperationState state(op->getLoc(), op->getName().getStringRef(), operands,
                         new_results, op->getAttrs(), op->getSuccessors());
    for (Region &region : op->getRegions()) {

func isParadigmLocale(lang language.Language, r language.Region) bool {
	for _, e := range paradigmLocales {
		if language.Language(e[0]) == lang && (r == language.Region(e[1]) || r == language.Region(e[2])) {
			return true
		}
	}
	return false
}

// regionGroupDist computes the distance between two regions based on their
// CLDR grouping.

	return s.scriptID.IsPrivateUse()
}

// Region is an ISO 3166-1 or UN M.49 code for representing countries and regions.
type Region struct {
	regionID language.Region
}

// EncodeM49 returns the Region for the given UN M.49 code.
// It returns an error if r is not a valid code.
func EncodeM49(r int) (Region, error) {
	rid, err := language.EncodeM49(r)
	return Region{rid}, err
}

</ul>

<h2>User-defined tasks and regions</h2>
<p>
  The trace API allows a target program to annotate a <a
  href='https://pkg.go.dev/runtime/trace#Region'>region</a> of code
  within a goroutine, such as a key function, so that its performance
  can be analyzed.

  <a href='https://pkg.go.dev/runtime/trace#Log'>Log events</a> may be
  associated with a region to record progress and relevant values.

    // collect effects for all ops in the regions instead of collecting effects
    // for the op itself. This is important to avoid conservatism and to find
    // resource variable accesses in regions which are not exposed to the op
    // interface.
    for (Region& region : op->getRegions()) {
      for (Operation& region_op : region.front().without_terminator()) {