managed_file example problem

API page: http://api.drupal.org/api/drupal/developer!topics!forms_api_reference.ht...

Is:

 // Save.
file_save($file);
// Record that the module (in this example, user module) is using the file.
file_usage_add($file, 'user', 'user', $account->uid); 

Does not work for me now. Warnings about files not referenced.

Should be:

// Record that the module (in this example, user module) is using the file.
file_usage_add($file, 'user', 'user', $account->uid);
// Save.
file_save($file); 

That way works all right.