(Program
  (Package
    (Identifier))
  (Function
    (Empty)
    (Identifier)
    ([])
    (
      (Call
      { (Identifier)
      ->(Identifier) }
        (
          (Identifier)
          (Variadic
            (Identifier)))
        (Empty))
      (Call
      { (Identifier)
      ->(Identifier) }
        (
          (Identifier)
          (Identifier))
        (Empty))
    {+(Call
      {+(Identifier)+}
      {+(
        {+(Identifier)+}
        {+(Variadic
          {+(Identifier)+})+})+}
      {+(Empty)+})+}
      (Call
      { (Identifier)
      ->(Identifier) }
      {+([])+}
      {-(
        {-(Identifier)-}
        {-(Variadic
          {-(Identifier)-})-})-}
        (Empty)))))