bug Eloquent

// (SQL: select (select `user`.`id` from `user` where `user`.`id` in (2013, 2015) limit 1)
// as ff from `user` as `tmp_user` 
// where `tmp_user`.`year` in (?, ?))

    public function arrayUser(){
        $arrayUser = [5,6];
        $arrayYear = [2013,2015];
        $subSelect = DB::table('user')
            ->select('user.id')
            ->wherein('user.id',$arrayUser)
            ->limit(1)
            ->toSql();
        DB::table('user as tmp_user')
            ->select(  DB::raw('('.$subSelect.') as ff')
            )
            ->wherein('tmp_user.year',$arrayYear)
            ->get();
    }