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

class _Y<T extends core::Object = dynamic> extends core::Object {
  const constructor •() → self::_Y<self::_Y::T>
    ;
}
class A<T extends core::Object = dynamic> extends core::Object {
  generic-covariant-impl field self::_Y<self::A::T> x;
  constructor •(self::_Y<self::A::T> x) → self::A<self::A::T>
    ;
}
class B<T extends core::Object = dynamic> extends self::A<self::B::T> {
  constructor •() → self::B<self::B::T>
    ;
}
static method main() → dynamic
  ;