==================== Parser ====================
module CommentsDataInstanceDeriving where
<document comment>
data family U a
<document comment>
data instance U ()
  = UUnit
  deriving (Eq " Comment on the derived  Eq   (U ())  instance",
            Ord " Comment on the derived  Ord  (U ())  instance",
            Show " Comment on the derived  Show (U ())  instance")