}

  public void testFindLast_refStream() {
    assertThat(findLast(Stream.of())).isEmpty();
    assertThat(findLast(Stream.of("a", "b", "c", "d"))).hasValue("d");

    // test with a large, not-subsized Spliterator
    List<Integer> list =
        IntStream.rangeClosed(0, 10000).boxed().collect(Collectors.toCollection(LinkedList::new));
    assertThat(findLast(list.stream())).hasValue(10000);

     */
    fun findLast(fir: FirElement): CFGNode<*>? {
        val directNodes = mapping[fir]
        if (directNodes != null) {
            return directNodes.last()
        }

        if (fir is FirBlock) {
            return fir.statements
                .asReversed()
                .firstNotNullOfOrNull(::findLast)
        }

        return null
    }

   * RandomAccess} support, then this operation is guaranteed to be {@code O(1)}.
   *
   * <p><b>{@code Stream} equivalent:</b> {@link Streams#findLast Streams.findLast(stream).get()}
   *
   * @return the last element of {@code iterable}
   * @throws NoSuchElementException if the iterable is empty
   */
  @ParametricNullness

   * RandomAccess} support, then this operation is guaranteed to be {@code O(1)}.
   *
   * <p><b>{@code Stream} equivalent:</b> {@link Streams#findLast Streams.findLast(stream).get()}
   *
   * @return the last element of {@code iterable}
   * @throws NoSuchElementException if the iterable is empty
   */
  @ParametricNullness