public static <E extends Enum<E>> ImmutableSet<E> immutableEnumSet(Iterable<E> elements) {
    if (elements instanceof ImmutableEnumSet) {
      return (ImmutableEnumSet<E>) elements;
    } else if (elements instanceof Collection) {
      Collection<E> collection = (Collection<E>) elements;
      if (collection.isEmpty()) {
        return ImmutableSet.of();
      } else {

  public static <E extends Enum<E>> ImmutableSet<E> immutableEnumSet(Iterable<E> elements) {
    if (elements instanceof ImmutableEnumSet) {
      return (ImmutableEnumSet<E>) elements;
    } else if (elements instanceof Collection) {
      Collection<E> collection = (Collection<E>) elements;
      if (collection.isEmpty()) {
        return ImmutableSet.of();
      } else {

  }

  // TODO b/327389044 - `Set<? extends Object> elements` should be enough but J2KT needs the <E>
  private static <E> void assertPowerSetHashCode(int expected, Set<E> elements) {
    assertEquals(expected, powerSet(elements).hashCode());
  }

  private static void assertPowerSetSize(int i, Object... elements) {
    assertEquals(i, powerSet(newHashSet(elements)).size());
  }

   * should use an explicit {@code break} or be certain that you will eventually remove all the
   * elements.
   */
  @SafeVarargs
  public static <T extends @Nullable Object> Iterator<T> cycle(T... elements) {
    return cycle(Lists.newArrayList(elements));
  }

  /**
   * Returns an Iterator that walks the specified array, nulling out elements behind it. This can
   * avoid memory leaks when an element is no longer necessary.
   *

   * should use an explicit {@code break} or be certain that you will eventually remove all the
   * elements.
   */
  @SafeVarargs
  public static <T extends @Nullable Object> Iterator<T> cycle(T... elements) {
    return cycle(Lists.newArrayList(elements));
  }

  /**
   * Returns an Iterator that walks the specified array, nulling out elements behind it. This can
   * avoid memory leaks when an element is no longer necessary.
   *

    }

    @SuppressWarnings("GrUnnecessaryPublicModifier")
    public <S extends T> Class<S> getOtherType() {
        return d.class as Class<S>
    }

    List<T> iterationOrder(T... elements) {
        return elements
    }

    abstract boolean isExternalProviderAllowed()

    abstract boolean isDirectElementAdditionAllowed()

    abstract boolean isElementRemovalAllowed()

        result.groupedOutput.task(":outgoingVariants").assertOutputContains """--------------------------------------------------
Variant apiElements
--------------------------------------------------
API elements for the 'main' feature.

Capabilities
    - org:myLib:1.0 (default capability)
Attributes
    - org.gradle.category            = library
    - org.gradle.dependency.bundling = external

the<SourceSetContainer>()["main"].srcDir("src/core/java")
----

The snippet above also demonstrates one way of configuring the elements of a project extension that is a container.

==== Elements in project-extension containers

Container-based project extensions, such as `SourceSetContainer`, also allow you to configure the elements held by them.

        !collection.explicit
    }

    def "elements provider tracks changes to content"() {
        given:
        def file1 = new File("1")
        def file2 = new File("2")
        def callable = Mock(Callable)

        collection.from(callable)
        def elements = collection.elements

        when:
        def f1 = elements.get()

        then:
        f1*.asFile == [file1, file2]

        property.convention(["other"])
        assertValueIs(["a"])
    }

    def "ignores convention after elements added"() {
        expect:
        property.addAll(["a", "b"])
        property.convention(["other"])
        assertValueIs(["a", "b"])
    }

    def "ignores convention after elements added using provider"() {
        expect:
        property.addAll(Providers.of(["a", "b"]))