*
     * @param elements the {@code Iterable} to add to the {@code ImmutableList}
     * @return this {@code Builder} object
     * @throws NullPointerException if {@code elements} is null or contains a null element
     */
    @CanIgnoreReturnValue
    @Override
    public Builder<E> add(E... elements) {
      super.add(elements);
      return this;
    }

    /**

  final transient E element;

  SingletonImmutableSet(E element) {
    this.element = Preconditions.checkNotNull(element);
  }

  @Override
  public int size() {
    return 1;
  }

  @Override
  public boolean contains(@CheckForNull Object target) {
    return element.equals(target);
  }

  @Override
  public UnmodifiableIterator<E> iterator() {

Diagnostics from elements:
  for PSI element of type KtClass at (6,1-11)
    ABSTRACT_CLASS_MEMBER_NOT_IMPLEMENTED      text ranges: [(62,69)]
      PSI: KtClass at (6,1-11)
  for PSI element of type KtNamedFunction at (4,3-21)
    ABSTRACT_FUNCTION_IN_NON_ABSTRACT_CLASS      text ranges: [(41,49)]
      PSI: KtNamedFunction at (4,3-21)
  for PSI element of type KtTypeReference at (6,10-11)
    FINAL_SUPERTYPE      text ranges: [(71,72)]

}


private
suspend fun WriteContext.writeCollectionCheckingForCircularElements(collection: Collection<Any?>) {
    var writeCircularMarker = true
    writeCollection(collection) { element ->
        if (element != null && element in circularReferences && element.javaClass.overridesHashCode()) {
            logPropertyProblem("serialize") {
                text("Circular references can lead to undefined behavior upon deserialization.")
            }

                void createElement(CustomToString element) {
                    element.stringRepresentation = "custom string representation"
                }

                @Mutate
                void addEchoTask(ModelMap<Task> tasks, CustomToString element) {
                    tasks.create("echo") {
                        it.doLast {
                            println "element: ${element.toString()}"
                        }

import javax.annotation.Nullable;

/**
 * Represents an element which belongs to some hierarchy.
 *
 * @since 1.0-milestone-5
 */
public interface HierarchicalElement extends Element {

    /**
     * Returns the parent of this element, or {@code null} if there is no parent.
     *
     * @return The parent of this element, or {@code null} if there is no parent.
     * @since 1.0-milestone-5
     */

/**
 * Represents an element in a model. Elements are arranged in a hierarchy.
 */
@Incubating
public interface ModelElement extends Named {
    /**
     * Returns the name of this element. Each element has a name associated with it, that uniquely identifies the element amongst its siblings.
     * Some element have their name generated or automatically assigned, and for these elements the name may not be human consumable.
     */

  @Override
  public int indexOf(@CheckForNull Object element) {
    return delegate().indexOf(element);
  }

  @Override
  public int lastIndexOf(@CheckForNull Object element) {
    return delegate().lastIndexOf(element);
  }

  @Override
  public ListIterator<E> listIterator() {
    return delegate().listIterator();
  }

  @Override
  public ListIterator<E> listIterator(int index) {

  // This reference is used both by the custom field serializer, and by the
  // GWT compiler to infer the elements of the lists that needs to be
  // serialized.
  //
  // Although this reference is non-final, it doesn't change after set creation.
  E element;

  SingletonImmutableSet(E element) {
    this.element = checkNotNull(element);
  }

  @Override
  public int size() {
    return 1;
  }

  @Override

    public IsolatedSet(ImmutableSet<Isolatable<?>> elements) {
        super(elements);
    }

    @Override
    public ValueSnapshot asSnapshot() {
        ImmutableSet.Builder<ValueSnapshot> builder = ImmutableSet.builderWithExpectedSize(elements.size());
        for (Isolatable<?> element : elements) {
            builder.add(element.asSnapshot());
        }
        return new SetValueSnapshot(builder.build());