/**
     * Creates a copy of this reference for the given entry.
     *
     * <p>{@code value} may be null only for a loading reference.
     */
    ValueReference<K, V> copyFor(
        ReferenceQueue<V> queue, @CheckForNull V value, ReferenceEntry<K, V> entry);

    /**
     * Notify pending loads that a new value was set. This is only relevant to loading value
     * references.
     */

          return null;
        }
        StrongKeyWeakValueEntry<K, V> newEntry = newEntry(segment, entry.key, entry.hash, newNext);
        newEntry.valueReference = entry.valueReference.copyFor(segment.queueForValues, newEntry);
        return newEntry;
      }

      @Override
      public void setValue(
          StrongKeyWeakValueSegment<K, V> segment, StrongKeyWeakValueEntry<K, V> entry, V value) {

          return null;
        }
        StrongKeyWeakValueEntry<K, V> newEntry = newEntry(segment, entry.key, entry.hash, newNext);
        newEntry.valueReference = entry.valueReference.copyFor(segment.queueForValues, newEntry);
        return newEntry;
      }

      @Override
      public void setValue(
          StrongKeyWeakValueSegment<K, V> segment, StrongKeyWeakValueEntry<K, V> entry, V value) {

      List<ReferenceEntry<K, V>> writeOrder) {
    if (map.evictsBySize() || map.expiresAfterAccess()) {
      assertSameEntries(readOrder, ImmutableList.copyOf(segment.accessQueue));
    }
    if (map.expiresAfterWrite()) {
      assertSameEntries(writeOrder, ImmutableList.copyOf(segment.writeQueue));
    }
  }

  private static <K, V> void assertSameEntries(

      List<ReferenceEntry<K, V>> writeOrder) {
    if (map.evictsBySize() || map.expiresAfterAccess()) {
      assertSameEntries(readOrder, ImmutableList.copyOf(segment.accessQueue));
    }
    if (map.expiresAfterWrite()) {
      assertSameEntries(writeOrder, ImmutableList.copyOf(segment.writeQueue));
    }
  }

  private static <K, V> void assertSameEntries(

   *       one with {@link CharSequence#charAt(int)}.
   *   <li>use {@link Appendable#append(CharSequence)} in {@link #copyTo(Appendable)} and {@link
   *       #copyTo(CharSink)}. We know this is correct since strings are immutable and so the length
   *       can't change, and it is faster because many writers and appendables are optimized for

  private ListGenerators() {}

  public static class ImmutableListOfGenerator extends TestStringListGenerator {
    @Override
    protected List<String> create(String[] elements) {
      return ImmutableList.copyOf(elements);
    }
  }

  public static class BuilderAddListGenerator extends TestStringListGenerator {
    @Override
    protected List<String> create(String[] elements) {

    assertFalse(out.closed());
    source.copyTo(out);
    assertFalse(out.closed());
  }

  public void testClosesOnErrors_copyingToByteSinkThatThrows() {
    for (TestOption option : EnumSet.of(OPEN_THROWS, WRITE_THROWS, CLOSE_THROWS)) {
      TestByteSource okSource = new TestByteSource(bytes);
      assertThrows(IOException.class, () -> okSource.copyTo(new TestByteSink(option)));

      return ImmutableSortedSet.copyOf(elements);
    }
  }

  public static class ImmutableSortedSetHeadsetGenerator extends TestStringSortedSetGenerator {
    @Override
    protected SortedSet<String> create(String[] elements) {
      List<String> list = Lists.newArrayList(elements);
      list.add("zzz");
      return ImmutableSortedSet.copyOf(list).headSet("zzy");
    }
  }

    assertFalse(out.closed());
    source.copyTo(out);
    assertFalse(out.closed());
  }

  public void testClosesOnErrors_copyingToByteSinkThatThrows() {
    for (TestOption option : EnumSet.of(OPEN_THROWS, WRITE_THROWS, CLOSE_THROWS)) {
      TestByteSource okSource = new TestByteSource(bytes);
      assertThrows(IOException.class, () -> okSource.copyTo(new TestByteSink(option)));