Now all modules are in core modules folder

modules/diff/includes/node.inc

@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * @file
+ * Implementation of hook_diff() for node.module (body and title).
+ */
+
+/**
+ * Implementation of hook_diff() for node.module (body and title).
+ */
+function node_diff($old_node, $new_node) {
+
+  $result = array();
+  $type = node_get_types('type', $new_node);
+  $result['title'] = array(
+    '#name' => $type->title_label,
+    '#old' => array($old_node->title),
+    '#new' => array($new_node->title),
+    '#weight' => -5,
+    '#format' => array(
+      'show_header' => FALSE,
+    )
+  );
+  if ($type->has_body) {
+    $result['body'] = array(
+      '#name' => $type->body_label,
+      '#old' => explode("\n", $old_node->body),
+      '#new' => explode("\n", $new_node->body),
+    );
+  }
+  return $result;
+}