library;
import self as self;
import "dart:core" as core;

class A extends self::B {
  constructor •({required invalid-type field}) → self::A
    ;
}
class B extends core::Object {
  final field core::int field;
  constructor named({required core::int field}) → self::B
    ;
}
class C extends self::D {
  constructor •({required core::int field}) → self::C
    ;
}
class D extends core::Object {
  final field core::int field;
  constructor named({required core::int field}) → self::D
    ;
}