(Program
  (Module
    (Identifier))
  (Function
    (Empty)
    (Identifier)
    (Match
      (Pattern
        (LessThan
          (Identifier)
          (Identifier))
        (Call
          (Identifier)
          (Empty)))
      (
        (Pattern
          (LessThan
            (Identifier)
            (Identifier))
          (Call
            (Identifier)
            (Empty)))
        (Pattern
          (Equal
            (Identifier)
            (Integer))
          (Call
            (Identifier)
            (Empty)))))))