commandsTree := trie.NewTrie()

	// registerCommand registers a cli command.
	registerCommand := func(command cli.Command) {
		commands = append(commands, command)
		commandsTree.Insert(command.Name)
	}

	findClosestCommands := func(command string) []string {
		var closestCommands []string
		closestCommands = append(closestCommands, commandsTree.PrefixMatch(command)...)

func adbCopyGoroot() error {
	goTool, err := goTool()
	if err != nil {
		return err
	}
	cmd := exec.Command(goTool, "version")
	cmd.Stderr = os.Stderr
	out, err := cmd.Output()
	if err != nil {
		return fmt.Errorf("%v: %w", cmd, err)
	}
	goVersion := string(out)

	// Also known by cmd/dist. The bootstrap command deletes the file.
	statPath := filepath.Join(os.TempDir(), "go_android_exec-adb-sync-status")