! hushes IEFE auto-return with named function literal 

``` coco
stuff = !function thing arg
  wow
```

``` js
var stuff;
stuff = (function(){
  function thing(arg){
    wow;
  }
}());
```

compare to:

``` co
stuff = function thing arg
  wow
```

``` js
var stuff;
stuff = (function(){
  function thing(arg){
    return wow;
  }
  return thing;
}());
```
