(Program
  (Call
    (MemberAccess
      (This)
    { (Identifier)
    ->(Identifier) })
    (Function
      (Empty)
      (Empty)
      (Empty)
      (RequiredParameter
        (Empty)
        (Empty)
        (Assignment
          (Identifier)
          (Empty)))
      (
        (Return
          (MemberAccess
          { (Identifier)
          ->(Identifier) }
          { (Identifier)
          ->(Identifier) }))))
    (Empty)))