pkg/front_end/testcases/extension_types/nullable_access.dart.textual_outline_modelled.expect

extension E on ET? {
  void foo(int i) {}
}

extension type ET(int? i) {
  void foo() {}
}

method<X extends ET, Y extends ET?>(
    ET et1, ET? et2, X x1, X? x2, Y y1, Y? y2) {}