Laravel 5.1 IDE Helper Request doesn't work?

Laravel 5.1 IDE Helper Is there any difference between this

use Illuminate\Http\Request;

and that

use Request;

It would seem that it should not be. But it is!

In the second case, the application is not running. Why ? Code of _IDEHelper.php

class Request extends \ Illuminate \ Support \ Facades \ Request

for example   

public static function all () {
             return \ Illuminate \ Http \ Request :: all ();
         }

Why is it not working?

via Chebli Mohamed