==================
super-qualified call stays a flat selector chain
==================

class A extends B {
  void m() {
    super.turnOn();
  }
}

---

(program
  (class_definition
    (identifier)
    (superclass
      (type_identifier))
    (class_body
      (method_signature
        (function_signature
          (void_type)
          (identifier)
          (formal_parameter_list)))
      (function_body
        (block
          (expression_statement
            (super)
            (unconditional_assignable_selector
              (identifier))
            (selector
              (argument_part
                (arguments)))))))))
