Edit File: Defined.php
<?php use Twig\Node\Expression\Test\DefinedTest; class_exists('Twig\Node\Expression\Test\DefinedTest'); @trigger_error(sprintf('Using the "Twig_Node_Expression_Test_Defined" class is deprecated since Twig version 2.7, use "Twig\Node\Expression\Test\DefinedTest" instead.'), E_USER_DEPRECATED); if (\false) { /** @deprecated since Twig 2.7, use "Twig\Node\Expression\Test\DefinedTest" instead */ class Twig_Node_Expression_Test_Defined extends DefinedTest { } }