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<?php namespace Sonata\CoreBundle\Validator; class_alias( \Sonata\Form\Validator\ErrorElement::class, __NAMESPACE__.'\ErrorElement' ); namespace Sonata\Form\Validator; class ErrorElement { public function test(\Sonata\CoreBundle\Validator\ErrorElement $test) { echo 'OK'; } } namespace something; $a = new \Sonata\Form\Validator\ErrorElement(); $a->test($a);