[Macros handler]: case class with generics

[Roger Küng]

I have a case class which uses generics:

case class Root[T](data:Option[T])

when i try to create a macro handler:

object Root{
  implicit val rootFormat = Macros.handler[Root]
}

I receive the following error:

class Root takes type parameters

How exactly can I create a parsing macro for mongo if my case class uses generics?