facebook/hhvm — pull request #1421 by brandonwamboldt (2013-12-22 17:53:06+00:00)
Title: Fix SplDoublyLinkedList when using array syntax

Fixes #1415

If you append items to a `SplDoublyLinkedList` using array syntax (`$foo[] = 'bar'`), the tail would not be updated.

**Example:**

```