(Program
  (Module
    (Identifier))
  (Function
    (Empty)
    (Identifier)
    ([])
    (Assignment
      (Identifier)
      (Function
        (Empty)
        (Empty)
        (
          (
          { (Identifier)
          ->(Identifier) }
          { (Identifier)
          ->(Identifier) }))
        (
        { (Identifier)
        ->(Identifier) }
        { (Identifier)
        ->(Identifier) })
        (Return
          (
            (Integer)
            (Integer)))))))