void setPredecessorInValueSet(ValueSetLink<K, V> entry);

    void setSuccessorInValueSet(ValueSetLink<K, V> entry);
  }

  private static <K extends @Nullable Object, V extends @Nullable Object> void succeedsInValueSet(
      ValueSetLink<K, V> pred, ValueSetLink<K, V> succ) {
    pred.setSuccessorInValueSet(succ);
    succ.setPredecessorInValueSet(pred);
  }