(Program
  (Function
    (Empty)
    (Empty)
    (Empty)
    (RequiredParameter
      (Empty)
      (Empty)
      (Assignment
        (Identifier)
        (Empty)))
    (RequiredParameter
      (Empty)
      (Empty)
      (Assignment
        (Identifier)
        (Empty)))
    (
    { (Identifier)
    ->(Identifier) }))
  (Empty))