Meteor fibers "sync" mode is driving me crazy. Here is a simple code example :

```
var feedsData = feeds.fetch(); // [{_id: "1234"}, {_id: "6789", url: "http://...."}]
for(var i = 0, len = feedsData.length; i < len; i++) {
    var feed = feedsData[i];
    parser.parseURL(feed.url, function(err, out){
        console.log(feed._id, i); // outputs "6789" and "2" each times
    });
}

```

I don't understand how to make this work. The callback is called after the loop is over, but the internal internal variables such as feed should be preserved... and they are not.

The url parsed are good (the first one, then the second one), but then i can't update my data since I don't have the good \_id in the callback.

The wanted output would be: "1234" "0" and "6789" "1", not "6789" "2" both times...
How would you make this in Meteor / Fiber code ?