@LazyInit @RetainedWith @CheckForNull private transient ImmutableList<E> asList;

  @Override
  public ImmutableList<E> asList() {
    ImmutableList<E> result = asList;
    return (result == null) ? asList = createAsList() : result;
  }

  ImmutableList<E> createAsList() {
    return ImmutableList.asImmutableList(toArray());
  }

  /*

    @LazyInit private transient ImmutableList<E> asList;

    @Override
    public ImmutableList<E> asList() {
      ImmutableList<E> result = asList;
      if (result == null) {
        return asList = createAsList();
      } else {
        return result;
      }
    }

    ImmutableList<E> createAsList() {
      return new RegularImmutableAsList<E>(this, toArray());

    @LazyInit @RetainedWith @CheckForNull private transient ImmutableList<E> asList;

    @Override
    public ImmutableList<E> asList() {
      ImmutableList<E> result = asList;
      if (result == null) {
        return asList = createAsList();
      } else {
        return result;
      }
    }

    ImmutableList<E> createAsList() {
      return new RegularImmutableAsList<>(this, toArray());