checkPositionIndex(index, size());
    if (isEmpty()) {
      return (UnmodifiableListIterator<E>) EMPTY_ITR;
    } else {
      return new Itr<E>(this, index);
    }
  }

  /** A singleton implementation of iterator() for the empty ImmutableList. */
  private static final UnmodifiableListIterator<Object> EMPTY_ITR =
      new Itr<Object>(RegularImmutableList.EMPTY, 0);

                        "Please remove the version from the offending request and make sure the module containing the " +
                        "requested plugin '%s' is an implementation dependency",
                    pluginRequest, pluginRequest.getId()));
            }
        }
        if (!validationErrors.isEmpty()) {

                // work graph calculation and then later during resolution. It would be better if the configuration
                // implementation took care of this instead
                reference = new SoftReference<>(state);
                cachedValue = null;
            }
        }
    }

    public static class Factory {

  /*
   * This class is used to serialize all ImmutableSortedSet instances,
   * regardless of implementation type. It captures their "logical contents"
   * only. This is necessary to ensure that the existence of a particular
   * implementation type is an implementation detail.
   */
  @J2ktIncompatible // serialization
  private static class SerializedForm<E> implements Serializable {

        ClassPath classpath;
        List<File> searchClassPath;

        if (gradleInstallation == null) {
            // When not running from a Gradle distro, need the daemon main jar and the daemon server implementation plus the search path to look for other modules
            classpath = registry.getModule("gradle-daemon-server").getAllRequiredModulesClasspath();

      super("Returned value '" + actual + "' not found. Remaining elements: " + expected);
    }

    private static final long serialVersionUID = 0;
  }

  /**
   * Quasi-implementation of {@link ListIterator} that works from a list of elements and a set of
   * features to support (from the enclosing {@link AbstractIteratorTester} instance). Instead of

        contents = new ObjectCountLinkedHashMap<E>(contents);
        isLinkedHash = true;
        // to preserve insertion order through deletions, we have to switch to an actual linked
        // implementation at least for now, but this should be a super rare case
      } else if (buildInvoked) {
        contents = new ObjectCountHashMap<E>(contents);
        isLinkedHash = false;
      }
      buildInvoked = false;

    static final String CLASSES_PATTERN = "**/*.class";
    static final String BAD_IMPL_CLASS_WARNING_MESSAGE = "%s: A valid plugin descriptor was found for %s but the implementation class %s was not found in the jar.";
    static final String INVALID_DESCRIPTOR_WARNING_MESSAGE = "%s: A plugin descriptor was found for %s but it was invalid.";

  }

  /**
   * Serialized type for all ImmutableBiMap instances. It captures the logical contents and they are
   * reconstructed using public factory methods. This ensures that the implementation types remain
   * as implementation details.
   *
   * <p>Since the bimap is immutable, ImmutableBiMap doesn't require special logic for keeping the
   * bimap and its inverse in sync during serialization, the way AbstractBiMap does.

        if (scopes.put(scopeAnnotation, scope) != null) {
            throw new DIException(
                    "Cannot rebind scope annotation class to a different implementation: " + scopeAnnotation);
        }
        return this;
    }

    public <U> Injector bindInstance(Class<U> clazz, U instance) {
        Key<?> key = Key.of(clazz, ReflectionUtils.qualifierOf(clazz));