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

class A extends core::Object {
  field core::int* x;
  synthetic constructor •() → self::A*
    ;
}
class B extends core::Object {
  field self::A* a;
  synthetic constructor •() → self::B*
    ;
}
class C extends core::Object {
  field self::B* b;
  synthetic constructor •() → self::C*
    ;
}
class D extends core::Object {
  field self::C* c;
  synthetic constructor •() → self::D*
    ;
}
static method main() → void
  ;