assertThat(multiset).isEmpty();
  }

  public void testRemoveOccurrencesIterableEmpty() {
    Multiset<String> multiset = HashMultiset.create();
    Iterable<String> toRemove = Arrays.asList("a", "b", "a");
    assertFalse(Multisets.removeOccurrences(multiset, toRemove));
    assertTrue(multiset.isEmpty());
  }

  public void testRemoveOccurrencesMultisetEmpty() {

            }
        }

        private boolean hasFailures() {
            return !resolveFailures.isEmpty() || !provisioningFailures.isEmpty();
        }

        private String failureMessage() {
            StringBuilder sb = new StringBuilder();
            if (!resolveFailures.isEmpty()) {
                sb.append("Some toolchain resolvers had internal failures: ")

        if (jdk == null) {
            return false;
        }

        String version = context.getSystemProperties().get("java.version");

        if (version == null || version.isEmpty()) {
            problems.add(
                    BuilderProblem.Severity.ERROR,
                    ModelProblem.Version.BASE,
                    "Failed to determine Java version for profile " + profile.getId(),

        if (jdk == null) {
            return false;
        }

        String version = context.getSystemProperties().get("java.version");

        if (version == null || version.isEmpty()) {
            problems.add(new ModelProblemCollectorRequest(Severity.ERROR, Version.BASE)
                    .setMessage("Failed to determine Java version for profile " + profile.getId())

    return rangeContaining(value) != null;
  }

  @Override
  @CheckForNull
  public abstract Range<C> rangeContaining(C value);

  @Override
  public boolean isEmpty() {
    return asRanges().isEmpty();
  }

  @Override
  public void add(Range<C> range) {
    throw new UnsupportedOperationException();
  }

  @Override
  public void remove(Range<C> range) {

            Model target,
            List<? extends DependencyManagement> sources,
            ModelBuilderRequest request,
            ModelProblemCollector problems) {
        if (sources != null && !sources.isEmpty()) {
            Map<String, Dependency> dependencies = new LinkedHashMap<>();

            DependencyManagement depMgmt = target.getDependencyManagement();

            if (depMgmt != null) {

     *
     * So {@code (b : c).plus(a) == (a : b : c)}
     */
    @CheckReturnValue
    public abstract PersistentList<T> plus(T element);

    public abstract boolean isEmpty();

    private PersistentList() {}

    private static final PersistentList<Object> NIL = new PersistentList<Object>() {
        @Override
        public void forEach(Consumer<? super Object> consumer) {
        }

    @Override
    protected void merge(Metadata recessive) {
        List<Plugin> recessivePlugins = recessive.getPlugins();
        List<Plugin> plugins = metadata.getPlugins();
        if (!recessivePlugins.isEmpty() || !plugins.isEmpty()) {
            LinkedHashMap<String, Plugin> mergedPlugins = new LinkedHashMap<>();
            recessivePlugins.forEach(p -> mergedPlugins.put(p.getPrefix(), p));

    }

    /**
     * Returns true if this set contains no elements.
     *
     * @return true if this set contains no elements.
     */
    @Override
    public boolean isEmpty() {
        return map.isEmpty();
    }

    /**
     * Returns true if this set contains the specified element.
     *
     * @param o
     *            element whose presence in this set is to be tested.

    @Override
    public FileCollectionFingerprint read(Decoder decoder) throws IOException {
        Map<String, FileSystemLocationFingerprint> fingerprints = fingerprintMapSerializer.read(decoder);
        if (fingerprints.isEmpty()) {
            return FileCollectionFingerprint.EMPTY;
        }
        ImmutableMultimap<String, HashCode> rootHashes = readRootHashes(decoder);
        HashCode strategyConfigurationHash = hashCodeSerializer.read(decoder);