|  | library; | 
|  | import self as self; | 
|  | import "dart:core" as core; | 
|  |  | 
|  | class A1 extends core::Object { | 
|  | final field core::int foo; | 
|  | constructor •({required core::int foo = null}) → self::A1 | 
|  | ; | 
|  | } | 
|  | class B1 extends self::A1 { | 
|  | constructor •({required core::int foo = null}) → self::B1 | 
|  | ; | 
|  | } | 
|  | class C1 extends self::A1 { | 
|  | constructor •({required core::int foo = null}) → self::C1 | 
|  | ; | 
|  | } | 
|  | class A2 extends core::Object { | 
|  | final field core::int foo; | 
|  | final field core::String bar; | 
|  | constructor •({required core::int foo = null, required core::String bar = null}) → self::A2 | 
|  | ; | 
|  | } | 
|  | class B2 extends self::A2 { | 
|  | constructor •() → self::B2 | 
|  | ; | 
|  | } | 
|  | class C2 extends self::A2 { | 
|  | constructor •({required core::int foo = null}) → self::C2 | 
|  | ; | 
|  | constructor other({required core::int foo = null}) → self::C2 | 
|  | ; | 
|  | } | 
|  | static method main() → dynamic | 
|  | ; |