Description:
------------
namespace mynamespace;

use Symfony\Component\Validator\Constraints as Assert;

class myClass
{
    function classExists($name == 'NotBlank')
    {
        return function_exists('Assert\\' . $name)
    }

    function classExistsExt($name == 'NotBlank')
    {
        return function_exists('Symfony\Component\Validator\Constraints\\' . 
$name)
    }
}

myClass::classExists()
// returns false

myClass::classExists()
// returns true



Expected result:
----------------
To fully benefit from namespace importing and "aliasing", I would expect that 
method to return true when namespace alias is used instead of full/original one.