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