pkg/front_end/testcases/general/top_level_promotion.dart.textual_outline_modelled.expect

abstract class Class1 {
  String get field1;
}

abstract class Class2<V> {}

class Class3<V, D> {}

class Class4<K, V> {
  Class2<V> operator [](K key) => throw '';
}

class Class5 {
  Class2<Class1?> get getter1 => throw '';
  late final field2 = Class4<String?, bool>();
  late final field3 = getter1.method1(
    (o) => o != null ? field2[o.field1] : null,
  );
  method2() {}
}

extension Extension1<V> on Class2<V> {
  Class3<M, V> method1<M>(Function1<M, V> f) {}
}

typedef Function1<O, I> = Class2<O>? Function(I i);