let summary = "XLA Launch Op. For use by the XLA JIT only.";

  let arguments = (ins
    Variadic<TF_Tensor>:$constants,
    Variadic<TF_Tensor>:$args,
    Variadic<TF_ResourceTensor>:$resources,

    SymbolRefAttr:$function
  );

  let results = (outs
    Variadic<TF_Tensor>:$results
  );

  TF_DerivedOperandSizeAttr Nresources = TF_DerivedOperandSizeAttr<2>;

  );
}

def TF_CalibrationStatisticsSaverOp : TF_Op<"CalibrationStatisticsSaver", []> {
  let summary = "Aggregates and saves calibration statistics.";

  let arguments = (ins
    Variadic<TensorOf<[TF_Float32, TF_Int64]>>:$inputs,

    StrAttr:$output_file_path,
    StrArrayAttr:$ids,
    I32ArrayAttr:$calibration_methods
  );

  TF_DerivedOperandTypeListAttr Tin = TF_DerivedOperandTypeListAttr<0>;

}

func (w *typeWriter) tuple(tup *Tuple, variadic bool) {
	w.byte('(')
	if tup != nil {
		for i, v := range tup.vars {
			if i > 0 {
				w.byte(',')
			}
			// parameter names are ignored for type identity and thus type hashes
			if w.ctxt == nil && v.name != "" && w.paramNames {
				w.string(v.name)
				w.byte(' ')
			}
			typ := v.typ
			if variadic && i == len(tup.vars)-1 {

}

func (w *typeWriter) tuple(tup *Tuple, variadic bool) {
	w.byte('(')
	if tup != nil {
		for i, v := range tup.vars {
			if i > 0 {
				w.byte(',')
			}
			// parameter names are ignored for type identity and thus type hashes
			if w.ctxt == nil && v.name != "" && w.paramNames {
				w.string(v.name)
				w.byte(' ')
			}
			typ := v.typ
			if variadic && i == len(tup.vars)-1 {

					if check.recordTypes() {
						sig := makeSig(S, S, y.typ)
						sig.variadic = true
						check.recordBuiltinType(call.Fun, sig)
					}
					x.mode = value
					x.typ = S
					break
				}
			}
		}

		// check general case by creating custom signature
		sig := makeSig(S, S, NewSlice(T)) // []T required for variadic signature
		sig.variadic = true

struct AssertTypeEq;

template <typename T>
struct AssertTypeEq<T, T> {
  typedef bool type;
};

// A unique type used as the default value for the arguments of class
// template Types.  This allows us to simulate variadic templates
// (e.g. Types<int>, Type<int, double>, and etc), which C++ doesn't
// support directly.
struct None {};

// The following family of struct and struct templates are used to

  %axis = "tf.Const"() {device = "", value = dense<1> : tensor<i32>} : () -> tensor<i32>
  // tf.ConcatV2 accepts a variadic operand. The last operand should be compile
  // time constant.
  %0 = "tf.ConcatV2"(%arg0, %arg0, %arg0, %arg0, %axis) : (tensor<16x1xf32>, tensor<16x1xf32>, tensor<16x1xf32>, tensor<16x1xf32>, tensor<i32>) -> tensor<16x4xf32>

struct AssertTypeEq;

template <typename T>
struct AssertTypeEq<T, T> {
  typedef bool type;
};

// A unique type used as the default value for the arguments of class
// template Types.  This allows us to simulate variadic templates
// (e.g. Types<int>, Type<int, double>, and etc), which C++ doesn't
// support directly.
struct None {};

// The following family of struct and struct templates are used to

// typesSummary returns a string of the form "(t1, t2, ...)" where the
// ti's are user-friendly string representations for the given types.
// If variadic is set and the last type is a slice, its string is of
// the form "...E" where E is the slice's element type.
func (check *Checker) typesSummary(list []Type, variadic bool) string {
	var res []string
	for i, t := range list {
		var s string
		switch {
		case t == nil:

	r.Sync(pkgbits.SyncSignature)

	params := r.params()
	results := r.params()
	variadic := r.Bool()

	return types.NewSignatureType(recv, rtparams, tparams, params, results, variadic)
}

func (r *reader) params() *types.Tuple {
	r.Sync(pkgbits.SyncParams)

	params := make([]*types.Var, r.Len())
	for i := range params {