import javax.lang.model.SourceVersion;
import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.AnnotationValue;
import javax.lang.model.element.Element;
import javax.lang.model.element.ElementKind;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.TypeMirror;
import javax.tools.Diagnostic;

  // Query Operations

  /**
   * Returns the number of occurrences of {@code element} in this multiset.
   *
   * @param element the element to look for
   * @return the nonnegative number of occurrences of the element
   */
  @Override
  public int count(@CheckForNull Object element) {
    AtomicInteger existingCounter = Maps.safeGet(countMap, element);
    return (existingCounter == null) ? 0 : existingCounter.get();
  }

	// list element (l.Back()) and the previous element of the first list
	// element (l.Front()).
	next, prev *_Element[T]

	// The list to which this element belongs.
	list *_List[T]

	// The value stored with this element.
	Value T
}

// Next returns the next list element or nil.
func (e *_Element[T]) Next() *_Element[T] {
	if p := e.next; e.list != nil && p != &e.list.root {
		return p

      contents.put(element, occurrences + contents.get(element));
      return this;
    }

    /**
     * Adds or removes the necessary occurrences of an element such that the element attains the
     * desired count.
     *
     * @param element the element to add or remove occurrences of
     * @param count the desired count of the element in this multiset
     * @return this {@code Builder} object

//
//   - If the XML element contains a sub-element whose name matches
//     a struct field's XMLName tag and the struct field has no
//     explicit name tag as per the previous rule, unmarshal maps
//     the sub-element to that struct field.
//
//   - If the XML element contains a sub-element whose name matches a
//     field without any mode flags (",attr", ",chardata", etc), Unmarshal
//     maps the sub-element to that struct field.
//

   * Creates a new {@code EnumMultiset} containing the specified elements.
   *
   * <p>This implementation is highly efficient when {@code elements} is itself a {@link Multiset}.
   *
   * @param elements the elements that the multiset should contain
   * @throws IllegalArgumentException if {@code elements} is empty
   */
  public static <E extends Enum<E>> EnumMultiset<E> create(Iterable<E> elements) {
    Iterator<E> iterator = elements.iterator();

     *
     * @param type The type of element to select.
     * @param action The action to execute for each element becomes known.
     */
    <S> void whenElementKnown(Class<S> type, Action<? super S> action);

    /**

                prefixes.put(element, getParent(prefixElement));
                return true;
            }
            return false;
        }

        private void renameTo(T element, String newName) {
            elementsByName.remove(getCurrentlyAssignedName(element), element);
            elementsByName.put(newName, element);
            newNames.put(element, newName);
        }

  /**
   * A collector that converts a stream of zero or one elements to an {@code Optional}.
   *
   * @throws IllegalArgumentException if the stream consists of two or more elements.
   * @throws NullPointerException if any element in the stream is {@code null}.
   * @return {@code Optional.of(onlyElement)} if the stream has exactly one element (must not be
   *     {@code null}) and returns {@code Optional.empty()} if it has none.

  /**
   * A collector that converts a stream of zero or one elements to an {@code Optional}.
   *
   * @throws IllegalArgumentException if the stream consists of two or more elements.
   * @throws NullPointerException if any element in the stream is {@code null}.
   * @return {@code Optional.of(onlyElement)} if the stream has exactly one element (must not be
   *     {@code null}) and returns {@code Optional.empty()} if it has none.