(Program
  (Call
    (MemberAccess
      (This)
      (Identifier))
    (Function
      (Empty)
      (Empty)
      (Empty)
      (RequiredParameter
        (Empty)
        (Empty)
        (Empty)
        (Assignment
          (Identifier)
          (Empty)))
      (Statements
        (Return
          (MemberAccess
            (Identifier)
            (Identifier)))))
    (Empty)))