Why type hinting based on method return type doesn"t work in PhpStorm?

I'm switching from Eclipse to PhpStorm and noticed that I won't get type hinting in this code:

class Bar{

    public function hintMe(){...}

}



class Foo{

    private $bars = array();



    /**

    * @return Bar

    */

    public function getBar($pos){

        $this->bars[$x] = new Bar();



        return $this->bars[$x];

    }

}



$foo = new Foo();



$bar = $foo->getBar(2);



$bar->__hint-should-appear__

In Eclipse when typing $bar-> hinting will be active, but not in PhpStorm. Any ideas why it doesn't work?