Edit: class-feed.php

<?php /** * Feed API * * @package WordPress * @subpackage Feed * @deprecated 4.7.0 */ _deprecated_file( basename( __FILE__ ), '4.7.0', 'fetch_feed()' ); if ( ! class_exists( 'SimplePie\SimplePie', false ) ) { require_once ABSPATH . WPINC . '/class-simplepie.php'; } require_once ABSPATH . WPINC . '/class-wp-feed-cache.php'; require_once ABSPATH . WPINC . '/class-wp-feed-cache-transient.php'; require_once ABSPATH . WPINC . '/class-wp-simplepie-file.php'; require_once ABSPATH . WPINC . '/class-wp-simplepie-sanitize-kses.php';

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