Index: wp-includes/ms-settings.php
===================================================================
--- wp-includes/ms-settings.php	(revision 56098)
+++ wp-includes/ms-settings.php	(working copy)
@@ -97,8 +97,6 @@
 $wpdb->set_prefix( $table_prefix, false ); // $table_prefix can be set in sunrise.php.
 $wpdb->set_blog_id( $current_blog->blog_id, $current_blog->site_id );
 $table_prefix       = $wpdb->get_blog_prefix();
-$_wp_switched_stack = array();
-$switched           = false;
 
 // Need to init cache again after blog_id is set.
 wp_start_object_cache();
Index: wp-includes/rest-api/class-wp-rest-server.php
===================================================================
--- wp-includes/rest-api/class-wp-rest-server.php	(revision 56098)
+++ wp-includes/rest-api/class-wp-rest-server.php	(working copy)
@@ -1079,7 +1079,6 @@
 
 			foreach ( $handlers as $handler ) {
 				$callback = $handler['callback'];
-				$response = null;
 
 				// Fallback to GET method if no HEAD method is registered.
 				$checked_method = $method;