link within markdown-enabled div

[gbacon]

I expect

<div id="myid" markdown="1">
Use the [Google][1]!

[1]: http://www.google.com/
</div>

to become something like

<div id="myid">
<p>Use the <a href="http://www.google.com/">Google</a>!</p>
</div>

but the link isn't being processed. See related testcase.