Index: wp-includes/class-wp-walker.php
===================================================================
--- wp-includes/class-wp-walker.php     (Revision 19296)
+++ wp-includes/class-wp-walker.php     (Arbeitskopie)
@@ -52,7 +52,7 @@
         *
         * @param string $output Passed by reference. Used to append additional content.
         */
-       function start_lvl(&$output) {}
+       function start_lvl(&$output, $depth, $args) {}

        /**
         * Start the element output.
@@ -80,7 +80,7 @@
         *
         * @param string $output Passed by reference. Used to append additional content.
         */
-       function start_el(&$output)  {}
+       function start_el(&$output, $category,$depth, $args)  {}

         * Ends the element output, if needed.
@@ -93,7 +93,7 @@
         *
         * @param string $output Passed by reference. Used to append additional content.
         */
-       function end_el(&$output)    {}
+       function end_el(&$output, $category,$depth, $args)    {}

        /**
         * Traverse elements to create list from elements.
@@ -396,4 +396,4 @@
        }
 }

Index: wp-admin/includes/class-wp-list-table.php
===================================================================
--- wp-admin/includes/class-wp-list-table.php   (Revision 19296)
+++ wp-admin/includes/class-wp-list-table.php   (Arbeitskopie)
@@ -273,7 +273,7 @@
         * @since 3.1.0
         * @access public
         */
-       function bulk_actions() {
+       function bulk_actions($which) {
                $screen = get_current_screen();

                if ( is_null( $this->_actions ) ) {
@@ -814,7 +814,7 @@
         *
         * @param object $item The current item
         */
-       function single_row( $item ) {
+       function single_row( $item, $data ) {
                static $row_class = '';
                $row_class = ( $row_class == '' ? ' class="alternate"' : '' );