type WordDecoder struct {
	// CharsetReader, if non-nil, defines a function to generate
	// charset-conversion readers, converting from the provided
	// charset into UTF-8.
	// Charsets are always lower-case. utf-8, iso-8859-1 and us-ascii charsets
	// are handled by default.
	// One of the CharsetReader's result values must be non-nil.
	CharsetReader func(charset string, input io.Reader) (io.Reader, error)
}

	adec := *dec
	charsetReaderError := false
	adec.CharsetReader = func(charset string, input io.Reader) (io.Reader, error) {
		if dec.CharsetReader == nil {
			charsetReaderError = true
			return nil, charsetError(charset)
		}
		r, err := dec.CharsetReader(charset, input)
		if err != nil {
			charsetReaderError = true
		}
		return r, err
	}
	word, err = adec.Decode(s)
	if err == nil {

	//	"quot": `"`,
	Entity map[string]string

	// CharsetReader, if non-nil, defines a function to generate
	// charset-conversion readers, converting from the provided
	// non-UTF-8 charset into UTF-8. If CharsetReader is nil or
	// returns an error, parsing stops with an error. One of the
	// CharsetReader's result values must be non-nil.
	CharsetReader func(charset string, input io.Reader) (io.Reader, error)

	var lbody io.Reader
	if size > 0 {
		lbody = io.LimitReader(body, size)
	} else {
		lbody = body
	}
	d := xml.NewDecoder(lbody)
	// Ignore any encoding set in the XML body
	d.CharsetReader = nopCharsetConverter
	err := d.Decode(v)
	if errors.Is(err, io.EOF) {
		err = &xml.SyntaxError{
			Line: 0,
			Msg:  err.Error(),
		}
	}
	return err
}

		{
			`John Doe <jdoe@[192.168.0.1]>`,
			[]*Address{{
				Name:    "John Doe",
				Address: "jdoe@[192.168.0.1]",
			}},
		},
	}

	ap := AddressParser{WordDecoder: &mime.WordDecoder{
		CharsetReader: func(charset string, input io.Reader) (io.Reader, error) {
			in, err := io.ReadAll(input)
			if err != nil {
				return nil, err
			}

			switch charset {
			case "iso-8859-15":

	d.t.Fatalf("unexpected Read call on downCaser reader")
	panic("unreachable")
}

func TestRawTokenAltEncoding(t *testing.T) {
	d := NewDecoder(strings.NewReader(testInputAltEncoding))
	d.CharsetReader = func(charset string, input io.Reader) (io.Reader, error) {
		if charset != "x-testing-uppercase" {
			t.Fatalf("unexpected charset %q", charset)
		}
		return &downCaser{t, input.(io.ByteReader)}, nil
	}

		{"Attr.Name", Field, 0},
		{"Attr.Value", Field, 0},
		{"CharData", Type, 0},
		{"Comment", Type, 0},
		{"CopyToken", Func, 0},
		{"Decoder", Type, 0},
		{"Decoder.AutoClose", Field, 0},
		{"Decoder.CharsetReader", Field, 0},
		{"Decoder.DefaultSpace", Field, 1},
		{"Decoder.Entity", Field, 0},
		{"Decoder.Strict", Field, 0},
		{"Directive", Type, 0},
		{"Encoder", Type, 0},
		{"EndElement", Type, 0},