// use original key
        return parent.computeIfAbsent(key, mappingFunction);
    }

    @Override
    public V computeIfPresent(final K key, final BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
        // use original key
        return parent.computeIfPresent(key, remappingFunction);
    }

    @Override

   * @throws UnsupportedOperationException always
   * @deprecated Unsupported operation.
   */
  @Deprecated
  @Override
  @DoNotCall("Always throws UnsupportedOperationException")
  public final @Nullable V computeIfPresent(
      K key, BiFunction<? super K, ? super V, ? extends @Nullable V> remappingFunction) {
    throw new UnsupportedOperationException();
  }

  /**