(Statements
  (Function
    (Empty)
    (Empty)
  { (Identifier)
  ->(Identifier) }
    (RequiredParameter
      (Empty)
      (Empty)
      (Empty)
      (Identifier)
      (Empty))
    (RequiredParameter
      (Empty)
      (Empty)
      (Empty)
      (Identifier)
      (Empty))
    (StatementBlock
      (Yield
        (Empty))
      (Yield
        (Identifier))))
  (Empty))