(Program
  (Module
    (Identifier))
  (Function
    (Empty)
    (Identifier)
    ([]))
  (Function
    (Empty)
  { (Identifier)
  ->(Identifier) }
    ([]))
  (Function
    (Identifier)
  { (Identifier)
  ->(Identifier) }
    (
      (Identifier)
      (Identifier))
    (Identifier)
    (Identifier)
    (
      (Identifier)
      (Identifier))
    ([]))
  (Error)
  (Error))