return new Predicate<StackTraceElement>() {
      @Override
      public boolean apply(StackTraceElement element) {
        return element.getClassName().equals(clazz.getName());
      }
    };
  }

  private static final class CallerClass1 {
    static ListenableFuture<String> makeImmediateCancelledFuture() {
      return immediateCancelledFuture();