Nothing at all. But, if Julia takes off, I would not expect it to be the main selling point.<p>It can be a very interesting feature for somebody into language design, but the average Joe working in a lab is not going to learn a completely new language and rewrite all his Matlab code because of it. Most probably, he has not idea what it is or why he would want it.<p>It was an example of how, at this point, it seems like the web site is more directed towards language developers than potential users.