var tok1 Token = elt
	tok2 := CopyToken(tok1)
	if tok1.(StartElement).Attr[0].Value != "en" {
		t.Error("CopyToken overwrote Attr[0]")
	}
	if !reflect.DeepEqual(tok1, tok2) {
		t.Error("CopyToken(StartElement) != StartElement")
	}
	tok1.(StartElement).Attr[0] = Attr{Name{"", "lang"}, "de"}
	if reflect.DeepEqual(tok1, tok2) {
		t.Error("CopyToken(CharData) uses same buffer.")
	}
}

// The bytes do not include the <! and > markers.
type Directive []byte

// Copy creates a new copy of Directive.
func (d Directive) Copy() Directive { return Directive(bytes.Clone(d)) }

// CopyToken returns a copy of a Token.
func CopyToken(t Token) Token {
	switch v := t.(type) {
	case CharData:
		return v.Copy()
	case Comment:
		return v.Copy()
	case Directive:
		return v.Copy()
	case ProcInst:

		{"(UnmarshalError).Error", Method, 0},
		{"Attr", Type, 0},
		{"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},

pkg encoding/pem, type Block struct, Headers map[string]string
pkg encoding/pem, type Block struct, Type string
pkg encoding/xml, const Header ideal-string
pkg encoding/xml, func CopyToken(Token) Token
pkg encoding/xml, func Escape(io.Writer, []uint8)
pkg encoding/xml, func Marshal(interface{}) ([]uint8, error)
pkg encoding/xml, func MarshalIndent(interface{}, string, string) ([]uint8, error)