View file phpBB3/vendor/twig/twig/lib/Twig/ExtensionSet.php

<?php

use Twig\ExtensionSet;

class_exists('Twig\ExtensionSet');

@trigger_error('Using the "Twig_ExtensionSet" class is deprecated since Twig version 2.7, use "Twig\ExtensionSet" instead.', \E_USER_DEPRECATED);

if (false) {
    /** @deprecated since Twig 2.7, use "Twig\ExtensionSet" instead */
    class Twig_ExtensionSet extends ExtensionSet
    {
    }
}