@J2ObjCIncompatible
    REAL_CALLER {
      // We call the method only after checking that it's present.
      @IgnoreJRERequirement
      @SuppressWarnings({
        "Java8ApiChecker",
        "NewApi",
        // This method is a helper, which we call from a `finally` block, as recommended.
        "ReachabilityFenceUsage",
      })
      @Override
      void reachabilityFence(@Nullable Object o) {