You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: compose.go
    path of file: ./repos/devspace/vendor/golang.org/x/text/internal/language
    
    the code of the file until where you have to start completion: // Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package language

import (
	"sort"
	"strings"
)

// A Builder allows constructing a Tag from individual components.
// Its main user is Compose in the top-level language package.
type Builder struct {
	Tag Tag

	private    string // the x extension
	variants   []string
	extensions []string
}

// Make returns a new Tag from the current settings.
func (b *Builder) Make() Tag {
	t := b.Tag

	if len(b.extensions) > 0 || len(b.variants) > 0 {
		sort.Sort(sortVariants(b
    
func (b *Builder) Make() Tag {
	t := b.Tag

	if len(b.extensions) > 0 || len(b.variants) > 0 {
		sort.Sort(sortVariants(b.variants))
		sort.Strings(b.extensions)

		if b.private != "" {
			b.extensions = append(b.extensions, b.private)
		}
		n := maxCoreSize + tokenLen(b.variants...) + tokenLen(b.extensions...)
		buf := make([]byte, n)
		p := t.genCoreBytes(buf)
		t.pVariant = byte(p)
		p += appendTokens(buf[p:], b.variants...)
		t.pExt = uint16(p)
		p += appendTokens(buf[p:], b.extensions...)
		t.str = string(buf[:p])
		// We may not always need to remake the string, but when or when not
		// to do so is rather tricky.
		scan := makeScanner(buf[:p])
		t, _ = parse(&scan, "")
		return t

	} else if b.private != "" {
		t.str = b.private
		t.RemakeString()
	}
	return t
}