How do I return a reference to an object downloaded via a function?

Okay, I'm not sure if this is my brain having a meltdown or what, but I'm trying to get a reference to a downloaded object.. The DownloadSomethingFunction downloads an asset bundle. The problem I have is that any function that downloads something, requires a yield statement in order to allow the download however, this means that becomes impossible to return a value and thus be able to reference the object in question.

 myDownloadedObject : GameObject=DownloadSomething();//My reference object
 
 function DownloadSomething()
 {
        //do the download code here
        while(downloading)
          {
            yield;
          }
    return (someDownloadedObject);//ERROR:RETURNS ARE NOT ALLOWED FROM GENERATORS!
 }

Fingers crossed that my explanation makes some sense to somebody. Thanks in advance!