| class Default { | 
 |   const Default(this.defaultValue); | 
 |   final Object? defaultValue; | 
 | } | 
 |  | 
 | class Settings { | 
 |   const factory Settings({ | 
 |     @Default(Sidebar()) Sidebar sidebar, | 
 |   }) = _SSettings; | 
 | } | 
 |  | 
 | class Sidebar { | 
 |   const factory Sidebar() = _SSidebar; | 
 | } | 
 |  | 
 | abstract class _SSettings implements Settings { | 
 |   const factory _SSettings({Sidebar sidebar}) = _$_SSettings; | 
 | } | 
 |  | 
 | class _$_SSettings implements _SSettings { | 
 |   const _$_SSettings({this.sidebar = const Sidebar()}); | 
 |   final Sidebar sidebar; | 
 | } | 
 |  | 
 | abstract class _SSidebar implements Sidebar { | 
 |   const factory _SSidebar() = _$_SSidebar; | 
 | } | 
 |  | 
 | class _$_SSidebar implements _SSidebar { | 
 |   const _$_SSidebar(); | 
 | } | 
 |  | 
 | void main() {} |