func (r *TXTResource) GoString() string {
	s := "dnsmessage.TXTResource{TXT: []string{"
	if len(r.TXT) == 0 {
		return s + "}}"
	}
	s += `"` + printString([]byte(r.TXT[0]))
	for _, t := range r.TXT[1:] {
		s += `", "` + printString([]byte(t))
	}
	return s + `"}}`
}

func unpackTXTResource(msg []byte, off int, length uint16) (TXTResource, error) {
	txts := make([]string, 0, 1)

// The default case.
template <typename ToPrint, typename OtherOperand>
class FormatForComparison {
 public:
  static ::std::string Format(const ToPrint& value) {
    return ::testing::PrintToString(value);
  }
};

// Array.
template <typename ToPrint, size_t N, typename OtherOperand>
class FormatForComparison<ToPrint[N], OtherOperand> {
 public:

// The default case.
template <typename ToPrint, typename OtherOperand>
class FormatForComparison {
 public:
  static ::std::string Format(const ToPrint& value) {
    return ::testing::PrintToString(value);
  }
};

// Array.
template <typename ToPrint, size_t N, typename OtherOperand>
class FormatForComparison<ToPrint[N], OtherOperand> {
 public:

}

void VLogGraphIfAsked(const Graph& graph) {
  if (VLOG_IS_ON(3)) {
    GraphDef graph_def;
    graph.ToGraphDef(&graph_def);
    string serialized;
    ::tensorflow::protobuf::TextFormat::PrintToString(graph_def, &serialized);
    LOG(INFO) << serialized;
  }
}

struct InductionVarInfo {
  Output induction_var;
  Output loop_cond;
};