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

class B<T extends core::Object = dynamic> extends core::Object {
  generic-covariant-impl field self::B::T x;
  generic-covariant-impl field self::B::T y;
  synthetic constructor •() → self::B<self::B::T>
    ;
}
abstract class C<T extends core::Object = dynamic> extends core::Object implements self::B<core::num> {
  generic-covariant-impl field core::num x;
  synthetic constructor •() → self::C<self::C::T>
    ;
  abstract get y() → core::num;
  abstract set y(generic-covariant-impl core::num value) → void;
}
abstract class D<T extends core::Object = dynamic> extends core::Object implements self::B<self::D::T> {
  generic-covariant-impl field self::D::T x;
  synthetic constructor •() → self::D<self::D::T>
    ;
  abstract get y() → self::D::T;
  abstract set y(generic-covariant-impl self::D::T value) → void;
}
static method main() → dynamic
  ;