pkg/front_end/testcases/extension_types/issue53212.dart.textual_outline.expect

extension type E1(int foo) {
  E1.named(this.foo, super.bar);
}

extension type E2(int foo) {
  E2.named(this.foo, {required super.bar});
}

extension type E3(int foo) {
  E3.named(this.foo, [super.bar = null]);
}

extension type E4(super.foo) {}