sclass FlexThreadLocal<A> extends BetterThreadLocal<A> {
  static new ThreadLocal<Thread> motherThread;

  public A get() {
    ret isSet() ? super! : get(motherThread());
  }
  
  static void setMotherThread(Thread t) {
    motherThread.set(t);
  }
  
  static Thread motherThread() {
    ret motherThread!;
  }
}