pre := fmt.Sprintf("%s(%q): ", statname, devNullName)
	if fi.Size() != 0 {
		t.Errorf(pre+"wrong file size have %d want 0", fi.Size())
	}
	if fi.Mode()&ModeDevice == 0 {
		t.Errorf(pre+"wrong file mode %q: ModeDevice is not set", fi.Mode())
	}
	if fi.Mode()&ModeCharDevice == 0 {
		t.Errorf(pre+"wrong file mode %q: ModeCharDevice is not set", fi.Mode())
	}
	if fi.Mode().IsRegular() {

				data, origdata)
		}
	}
}

func TestWriterAddFSNonRegularFiles(t *testing.T) {
	fsys := fstest.MapFS{
		"device":  {Data: []byte("hello"), Mode: 0755 | fs.ModeDevice},
		"symlink": {Data: []byte("world"), Mode: 0755 | fs.ModeSymlink},
	}
	var buf bytes.Buffer
	tw := NewWriter(&buf)
	if err := tw.AddFS(fsys); err == nil {
		t.Fatal("expected error, got nil")
	}

        tf_device.return %identity : tensor<i32>
      }) {device = "some_device"} : () -> (tensor<i32>)
      return %launch : tensor<i32>
    }
    ```

    will be transformed into:

    ```mlir
    func @computation(%arg0: tensor<i32>) -> tensor<i32> {
      %launch = "tf_device.launch_func"(%arg0) {device = "some_device", func = @_func} : (tensor<i32>) -> tensor<i32>
      return %launch : tensor<i32>

		{"FileMode", Type, 16},
		{"FormatDirEntry", Func, 21},
		{"FormatFileInfo", Func, 21},
		{"Glob", Func, 16},
		{"GlobFS", Type, 16},
		{"ModeAppend", Const, 16},
		{"ModeCharDevice", Const, 16},
		{"ModeDevice", Const, 16},
		{"ModeDir", Const, 16},
		{"ModeExclusive", Const, 16},
		{"ModeIrregular", Const, 16},
		{"ModeNamedPipe", Const, 16},
		{"ModePerm", Const, 16},
		{"ModeSetgid", Const, 16},