Ticket #48558: 48558.diff

src/wp-includes/taxonomy.php

@@ -408 +408 @@
  *     @type bool          $_builtin              This taxonomy is a "built-in" taxonomy. INTERNAL USE ONLY!
  *                                                Default false.
  * }
- * @return void|WP_Error Void on success, WP_Error object on failure.
+ * @return WP_Taxonomy|WP_Error The registered taxonomy object on success, WP_Error object on failure.
  */
 function register_taxonomy( $taxonomy, $object_type, $args = array() ) {
         global $wp_taxonomies;
@@ -441 +441 @@
          * @param array        $args        Array of taxonomy registration arguments.
          */
         do_action( 'registered_taxonomy', $taxonomy, $object_type, (array) $taxonomy_object );
+
+        return $taxonomy_object;
 }
 
 /**