installed plugin Easy Digital Downloads version 3.1.0.3

wp-content/plugins/easy-digital-downloads/includes/utils/interface-static-registry.php

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+<?php
+/**
+ * Static_Registry interface
+ *
+ * @package     EDD
+ * @subpackage  Interfaces/Utilities
+ * @copyright   Copyright (c) 2018, Easy Digital Downloads, LLC
+ * @license     http://opensource.org/licenses/gpl-2.0.php GNU Public License
+ * @since       3.0
+ */
+namespace EDD\Utils;
+
+/**
+ * Defines the contract for a static (singleton) registry object.
+ *
+ * @since 3.0
+ */
+interface Static_Registry {
+
+	/**
+	 * Retrieves the one true registry instance.
+	 *
+	 * @since 3.0
+	 *
+	 * @return \EDD\Utils\Static_Registry Registry instance.
+	 */
+	public static function instance();
+
+}