Twig/lib/Twig/FileExtensionEscapingStrategy.php

<?php

use Twig\FileExtensionEscapingStrategy;

class_exists('Twig\FileExtensionEscapingStrategy');

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

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