return set1.isEmpty() && set2.isEmpty();
      }

      @Override
      public UnmodifiableIterator<E> iterator() {
        return new AbstractIterator<E>() {
          final Iterator<? extends E> itr1 = set1.iterator();
          final Iterator<? extends E> itr2 = set2.iterator();

          @Override
          @CheckForNull
          protected E computeNext() {
            if (itr1.hasNext()) {

        return set1.isEmpty() && set2.isEmpty();
      }

      @Override
      public UnmodifiableIterator<E> iterator() {
        return new AbstractIterator<E>() {
          final Iterator<? extends E> itr1 = set1.iterator();
          final Iterator<? extends E> itr2 = set2.iterator();

          @Override
          @CheckForNull
          protected E computeNext() {
            if (itr1.hasNext()) {

    }

    def "can iterate over domain objects ordered by order added"() {
        addToContainer(b)
        addToContainer(a)
        addToContainer(c)

        expect:
        def seen = []
        def iterator = container.iterator()
        seen << iterator.next()
        seen << iterator.next()
        seen << iterator.next()
        !iterator.hasNext()
        seen == iterationOrder(b, a, c)

        # See autograph/converters/control_flow.py - the function has a single
        # argument, the iterate before any expansion.
        assert self._for_loop_target_types[f_name_str] & {TFRTypes.ATTR}
        # Assume all loops are TF loops. Then the iterates are autoboxed into
        # Tensors.
        return {TFRTypes.INDEX}
      else:
        return None

    func = ns[f_name]

}

// typePointers is an iterator over the pointers in a heap object.
//
// Iteration through this type implements the tiling algorithm described at the
// top of this file.
type typePointers struct {
	// elem is the address of the current array element of type typ being iterated over.
	// Objects that are not arrays are treated as single-element arrays, in which case
	// this value does not change.

	// Note that we iterate through the init containers in reverse order to find
	// the next init container to run, as the completed init containers may get
	// removed from container runtime for various reasons. Therefore the kubelet
	// should rely on the minimal number of init containers - the last one.
	//
	// Once we find the next init container to run, iterate through the rest to

func (t *Type) Methods() []*Field {
	return t.methods.Slice()
}

// AllMethods returns a pointer to all the methods (including embedding) for type t.
// For an interface type, this is the set of methods that are typically iterated
// over. For non-interface types, AllMethods() only returns a valid result after
// CalcMethods() has been called at least once.
func (t *Type) AllMethods() []*Field {
	if t.kind == TINTER {

	OverflowUint(x uint64) bool

	// CanSeq reports whether a [Value] with this type can be iterated over using [Value.Seq].
	CanSeq() bool

	// CanSeq2 reports whether a [Value] with this type can be iterated over using [Value.Seq2].
	CanSeq2() bool

	common() *abi.Type
	uncommon() *uncommonType
}

include::sample[dir="snippets/files/fileCollections/groovy",files="build.gradle[tags=simple-params]"]
====

File collections have important attributes in Gradle.
They can be:

* created lazily
* iterated over
* filtered
* combined

_Lazy creation_ of a file collection is useful when evaluating the files that make up a collection when a build runs.

   * elements in {@code a}, followed by the elements in {@code b}, followed by the elements in
   * {@code c}. The source iterators are not polled until necessary.
   *
   * <p>The returned iterator supports {@code remove()} when the corresponding input iterator
   * supports it.
   */
  public static <T extends @Nullable Object> Iterator<T> concat(