How do I use pointers to receive values?

I've seen that JSCocoa allows to do this using an outArgument:

```
var error = new outArgument
if (![headerString writeToFile:headerFile atomically:true encoding:NSUTF8StringEncoding error:error]) {
   log("error" + error.outValue)
}
```

but this doesn't seem to work in JSTalk. Is it possible to do something like this?
