Php, code competion for inline-factory / dynamic method name?

Question

given this snippet:

class Test
{
    public function run2()
    {
    }
}

class Factory
{
    public function createTest()
    {
        return new Test();
    }
}

$factory = new Factory();
$m = 'createTest';
$factory->{$m}->run2();

Phpstorm will say most of it are unused:

of course I can extract the calls:

$factory = new Factory();
$m = 'createTest';
$x = $factory->{$m}();
/** @var $x Test */
$x->run2();

that way at least run2() is shown:

is there a "magic" phpdoc which Im not aware of? I dont want to extract method calls.