toks := *args
	if len(toks) == 0 || toks[0] == "(" {
		return VersionInterval{}, fmt.Errorf("expected '[' or version")
	}
	if toks[0] != "[" {
		v, err := parseVersion(verb, path, &toks[0], fix)
		if err != nil {
			return VersionInterval{}, err
		}
		*args = toks[1:]
		return VersionInterval{Low: v, High: v}, nil
	}
	toks = toks[1:]

	if len(toks) == 0 {

// license that can be found in the LICENSE file.

package xml

import (
	"bytes"
	"fmt"
	"io"
	"reflect"
	"strings"
	"testing"
	"unicode/utf8"
)

type toks struct {
	earlyEOF bool
	t        []Token
}

func (t *toks) Token() (Token, error) {
	if len(t.t) == 0 {
		return nil, io.EOF
	}
	var tok Token
	tok, t.t = t.t[0], t.t[1:]
	if t.earlyEOF && len(t.t) == 0 {
		return tok, io.EOF
	}