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<T extends core::num, S extends core::List<self::B::T> = core::List<core::num>> extends self::A<self::B::T> {
  constructor •([self::B::T? x = null]) → self::B<self::B::T, self::B::S>
    ;
}
static method main() → dynamic
  ;