(Program
  (Module
    (Identifier))
  (Function
    (Identifier)
    (Args)
  {+(FunctionCall
      (Identifier)
      (Identifier)
      (Identifier))+}
    (FunctionCall
    { (Identifier)
    ->(Identifier) }
      (Identifier)
      (Identifier))
  {+(FunctionCall
      (Identifier)
      (Identifier)
      (Identifier))+}
  {-(FunctionCall
      (Identifier)
      (Identifier)
      (Identifier))-}
  {-(FunctionCall
      (Identifier)
      (Identifier)
      (Identifier))-}))