pkg/front_end/testcases/extension_types/issue53170.dart.textual_outline.expect

extension type S1(num id) implements String {}

extension type S2(int id) implements num {}

extension type V1(num id) {}

extension type V2(String id) implements V1 {}

extension type V3(int id) implements V1 {}

extension type W1<T>(T id) {}

extension type W2(String id) implements W1<num> {}

extension type W3(int id) implements W1<num> {}