// last.
	related2(1.2, []float64{})
	related2(1.0, []int{})
	related2 /* ERROR "Slice (type []int) does not satisfy interface{[]Elem}" */ (float64(1.0), []int{}) // TODO(gri) better error message
}

type List[P any] []P

func related3[Elem any, Slice []Elem | List[Elem]]() Slice { return nil }

func _() {
	// related3 can be instantiated explicitly
	related3[int, []int]()
	related3[byte, List[byte]]()

// the receiver stops reading them.
func _Ranger[Elem any]() (*_Sender[Elem], *_Receiver[Elem]) {
	c := make(chan Elem)
	d := make(chan struct{})
	s := &_Sender[Elem]{
		values: c,
		done:   d,
	}
	r := &_Receiver[Elem]{
		values: c,
		done:   d,
	}
	runtime.SetFinalizer(r, (*_Receiver[Elem]).finalize)
	return s, r
}

// A _Sender is used to send values to a Receiver.

  // CHECK: TensorListReserve
  %tl = "tf.TensorListReserve"(%elem_shape, %size) : (tensor<2xi32>, tensor<i32>) -> tensor<!tf_type.variant<tensor<?x1xf32>>>
  %elem_1 = "tf._SomeOtherOp"() : () -> tensor<8x1xf32>
  %tl_set_item = "tf.TensorListSetItem"(%tl, %one, %elem_1) : (tensor<!tf_type.variant<tensor<?x1xf32>>>, tensor<i32>, tensor<8x1xf32>) -> tensor<!tf_type.variant<tensor<?x1xf32>>>
  func.return
}

func (mapError) Error() string { return "mapError" }

var _ error = mapError{}
var _ error = new(mapError)

func TestImplements(t *testing.T) {
	for _, tt := range implementsTests {
		xv := TypeOf(tt.x).Elem()
		xt := TypeOf(tt.t).Elem()
		if b := xv.Implements(xt); b != tt.b {
			t.Errorf("(%s).Implements(%s) = %v, want %v", TypeString(xv), TypeString(xt), b, tt.b)
		}
	}
}

var assignableTests = []struct {
	x any
	t any

// allocated temporary variable of type [len]elem. This variable is
// initialized, and elem must not contain pointers.
func stackBufAddr(len int64, elem *types.Type) *ir.AddrExpr {
	if elem.HasPointers() {
		base.FatalfAt(base.Pos, "%v has pointers", elem)
	}
	tmp := typecheck.TempAt(base.Pos, ir.CurFunc, types.NewArray(elem, len))
	return typecheck.Expr(typecheck.NodAddr(tmp)).(*ir.AddrExpr)

func TestLookupPtrToStruct(t *testing.T) {
	type Elem struct {
		Key   string
		Value string
	}
	type Outer struct {
		Inner []Elem `json:"inner" patchStrategy:"merge" patchMergeKey:"key"`
	}
	outer := &Outer{}
	elemType, patchStrategies, patchMergeKey, err := LookupPatchMetadataForStruct(reflect.TypeOf(outer), "inner")
	if err != nil {
		t.Fatal(err)
	}
	if elemType != reflect.TypeOf([]Elem{}) {

	ch := make(chan bool, 1)
	i := 0
	v := reflect.ValueOf(&i)
	go func() {
		v.Elem().Set(reflect.ValueOf(1))
		ch <- true
	}()
	_ = v.Elem().Int()
	<-ch
}

func TestRaceReflectWW(t *testing.T) {
	ch := make(chan bool, 1)
	i := 0
	v := reflect.ValueOf(&i)
	go func() {
		v.Elem().Set(reflect.ValueOf(1))
		ch <- true
	}()
	v.Elem().Set(reflect.ValueOf(2))
	<-ch
}

func TestRaceReflectCopyWW(t *testing.T) {

  size_t offset = 0;
  for (auto const& e : v) {
    Tensor elem = e.tensor;
    if (first.tensor.dtype() == DT_STRING) {
      for (int i = 0; i < elem.NumElements(); ++i) {
        t.flat<tstring>()(offset + i) = elem.flat<tstring>()(i);
      }
      offset += elem.NumElements();
    } else {
      std::copy_n(elem.tensor_data().data(), elem.TotalBytes(),
                  const_cast<char*>(t.tensor_data().data()) + offset);

				return nil
			}

			want := true
			elem := ""

			// Don't use GOROOT/src but do walk down into it.
			if pkgDir == root {
				if importPathRoot == "" {
					return nil
				}
			} else {
				// Avoid .foo, _foo, and testdata subdirectory trees.
				_, elem = filepath.Split(pkgDir)
				if strings.HasPrefix(elem, ".") || strings.HasPrefix(elem, "_") || elem == "testdata" {
					want = false
				}
			}

	return strings.Split(path, string(ListSeparator))
}

func abs(path string) (string, error) {
	return unixAbs(path)
}

func join(elem []string) string {
	// If there's a bug here, fix the logic in ./path_plan9.go too.
	for i, e := range elem {
		if e != "" {
			return Clean(strings.Join(elem[i:], string(Separator)))
		}
	}
	return ""
}

func sameWord(a, b string) bool {
	return a == b