@janua It generates this:
```
def bestsellers(format:String): Call = {
   (format: @unchecked) match {
// @LINE:29
case (format) if format == "html" => Call("GET", _prefix + { _defaultPrefix } + "commercial/books/bestsellers")
                                                        
// @LINE:30
case (format) if format == "json" => Call("GET", _prefix + { _defaultPrefix } + "commercial/books/bestsellers.json")
                                                        
   }
}
```