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

class A<T extends core::Object? = dynamic> extends core::Object {
  synthetic constructor •() → self::A<self::A::T%>
    ;
}
class B<U extends core::Object? = dynamic> extends core::Object {
  synthetic constructor •() → self::B<self::B::U%>
    ;
  method fun() → dynamic
    ;
}
static method main() → dynamic
  ;