*/
    @IgnoreJRERequirement // Users will use this only if they're already using streams.
    @CanIgnoreReturnValue
    public Builder addAll(LongStream stream) {
      Spliterator.OfLong spliterator = stream.spliterator();
      long size = spliterator.getExactSizeIfKnown();
      if (size > 0) { // known *and* nonempty
        ensureRoomFor(Ints.saturatedCast(size));
      }

        .containsExactly(0L, 1L, 3L, 6L, 10L, 15L, 21L)
        .inOrder();
  }

  public void testAsListIterator() {
    PrimitiveIterator.OfLong longIterator =
        (PrimitiveIterator.OfLong) ImmutableLongArray.of(1, 2, 3).asList().iterator();
    assertThat(longIterator.nextLong()).isEqualTo(1);
    assertThat(longIterator.nextLong()).isEqualTo(2);