library /*isNonNullableByDefault*/;
import self as self;
import "dart:core" as core;

class A<X extends core::Object? = dynamic> extends core::Object {
  covariant-by-class field self::A::X% field;
  constructor •(self::A::X% field) → self::A<self::A::X%>
    ;
}
abstract class B<Y extends core::Object? = dynamic> extends core::Object implements self::A<self::B::Y%> {
  synthetic constructor •() → self::B<self::B::Y%>
    ;
  abstract get field() → self::B::Y%;
  abstract set field(covariant-by-class self::B::Y% value) → void;
}
abstract class C extends core::Object implements self::A<core::int> {
  synthetic constructor •() → self::C
    ;
  abstract get field() → core::int;
  abstract set field(covariant-by-class core::int value) → void;
}
static method main() → dynamic
  ;