possible fix for drush_drupal_version

drupal.inc.patch

diff --git a/includes/drupal.inc b/includes/drupal.inc
index b24dc52..f34fee2 100644
--- a/includes/drupal.inc
+++ b/includes/drupal.inc
@@ -47,15 +47,23 @@ function drush_drupal_version($drupal_root = NULL) {
         }
       }
       else {
-        // D7 stores VERSION in bootstrap.inc.
-        // D6 and below does it in system.module.
-        $version_constant_paths = array('/includes/bootstrap.inc', '/modules/system/system.module');
-        foreach ($version_constant_paths as $path) {
-          if (file_exists($drupal_root . $path)) {
-            require_once $drupal_root . $path;
-            if (defined('VERSION')) {
-              $version = VERSION;
-              break;
+        if (file_exists($drupal_root . '/core/misc/backdrop.js')) {
+          require_once $drupal_root . '/core/includes/bootstrap.inc';
+          if (defined('Drupal::VERSION')) {
+            $version = Drupal::VERSION;
+          }
+        }
+        else {
+          // D7 stores VERSION in bootstrap.inc.
+          // D6 and below does it in system.module.
+          $version_constant_paths = array('/includes/bootstrap.inc', '/modules/system/system.module');
+          foreach ($version_constant_paths as $path) {
+            if (file_exists($drupal_root . $path)) {
+              require_once $drupal_root . $path;
+              if (defined('VERSION')) {
+                $version = VERSION;
+                break;
+              }
             }
           }
         }