rid, err := language.EncodeM49(r)
	return Region{rid}, err
}

// ParseRegion parses a 2- or 3-letter ISO 3166-1 or a UN M.49 code.
// It returns a ValueError if s is a well-formed but unknown region identifier
// or another error if another error occurred.
func ParseRegion(s string) (Region, error) {
	r, err := language.ParseRegion(s)
	return Region{r}, err
}

func EncodeM49(r int) (Region, error) {
	return getRegionM49(r)
}

// ParseRegion parses a 2- or 3-letter ISO 3166-1 or a UN M.49 code.
// It returns a ValueError if s is a well-formed but unknown region identifier
// or another error if another error occurred.
func ParseRegion(s string) (r Region, err error) {
	defer func() {
		if recover() != nil {
			r = 0
			err = ErrSyntax
		}

}

ParseResult GraphOp::parse(OpAsmParser &parser, OperationState &result) {
  llvm::SMLoc loc = parser.getCurrentLocation();

  // Parse the body region.
  Region &body = *result.addRegion();
  if (parser.parseRegion(body)) return failure();

  // Ensure that the region is well formed: it contains at least a block with
  // a FetchOp terminator.
  GraphOp::ensureTerminator(body, parser.getBuilder(), result.location);

  for (auto argAndType : llvm::zip(region_args, region_arg_types)) {
    auto& arg = packed_args.emplace_back();
    arg.ssaName = std::get<0>(argAndType);
    arg.type = std::get<1>(argAndType);
  }
  if (parser.parseRegion(body, packed_args)) return failure();

  // Add derived `operandSegmentSizes` attribute based on parsed operands.
  if (!result.attributes.get(kOperandSegmentSizesAttr)) {