Hm...

```
[23:37] dev-nelson ~> cat test.php
<?php
namespace some\ns;

ini_set('display_errors', true);

$x = new stdClass();
$x->test = 5;
print_r($x);
[23:37] dev-nelson ~> php test.php

Fatal error: Class 'some\ns\stdClass' not found in /home/nelson/test.php on line 6
[23:37] dev-nelson ~>
```