private static void rethrow(ExecutionException e) throws ExecutionException {
    Throwable wrapper = e.getCause();
    if (wrapper instanceof WrapperException) {
      Throwable cause = wrapper.getCause();
      if (cause instanceof RuntimeException) {
        throw (RuntimeException) cause;
      } else if (cause instanceof Error) {
        throw (Error) cause;
      }
    }
    throw e;
  }

  @Override

        assertUniqueKey(key);

        SetWithResolutionResult artifacts;
        if (projectArtifacts instanceof SetWithResolutionResult setWithResolutionResult) {
            artifacts = setWithResolutionResult;
        } else if (projectArtifacts instanceof ArtifactsSetWithResult artifactsSetWithResult) {
            artifacts = new SetWithResolutionResult(artifactsSetWithResult.getResult(), projectArtifacts);

    for (Collection<V> valueCollection : multimap().asMap().values()) {
      assertTrue(valueCollection instanceof Set);
    }
  }

  public void testAsMapGetImplementsSet() {
    for (K key : multimap().keySet()) {
      assertTrue(multimap().asMap().get(key) instanceof Set);
    }
  }

  @MapFeature.Require(SUPPORTS_REMOVE)
  public void testAsMapRemoveImplementsSet() {

  }

  public static final class NullsBeforeB extends NullsBefore {
    public static final NullsBeforeB INSTANCE = new NullsBeforeB();

    private NullsBeforeB() {
      super("b");
    }
  }

  public static final class NullsBeforeTwo extends NullsBefore {
    public static final NullsBeforeTwo INSTANCE = new NullsBeforeTwo();

    private NullsBeforeTwo() {

    return MoreObjects.toStringHelper(ServiceManager.class)
        .add("services", Collections2.filter(services, not(instanceOf(NoOpService.class))))
        .toString();
  }

  /**
   * An encapsulation of all the mutable state of the {@link ServiceManager} that needs to be
   * accessed by instances of {@link ServiceListener}.
   */
  private static final class ServiceManagerState {

    return MoreObjects.toStringHelper(ServiceManager.class)
        .add("services", Collections2.filter(services, not(instanceOf(NoOpService.class))))
        .toString();
  }

  /**
   * An encapsulation of all the mutable state of the {@link ServiceManager} that needs to be
   * accessed by instances of {@link ServiceListener}.
   */
  private static final class ServiceManagerState {

        while (enclosingElement instanceof TypeElement enclosingTypeElement) {
            className.insert(0, "$").insert(0, enclosingTypeElement.getSimpleName());
            enclosingElement = enclosingElement.getEnclosingElement();
        }

        if (enclosingElement instanceof PackageElement packageElement) {

        return this;
    }

    @Override
    public Path getPath() {
        return null;
    }

    @Override
    public Nature getNature() {
        if (metadata instanceof RepositoryMetadata repositoryMetadata) {
            return switch (repositoryMetadata.getNature()) {
                case RepositoryMetadata.RELEASE_OR_SNAPSHOT -> Nature.RELEASE_OR_SNAPSHOT;

    }

    @Override
    public int hashCode() {
        return name.hashCode();
    }

    @Override
    public boolean equals(Object other) {
        return (other instanceof Parameter parameter) && getName().equals(parameter.getName());
    }

    public String getAlias() {
        return alias;
    }

    public void setAlias(String alias) {
        this.alias = alias;

        NodeList childNodes = element.getChildNodes();
        for (int i = 0; i < childNodes.getLength(); i++) {
            Node node = childNodes.item(i);
            if (node instanceof Element) {
                Element childElement = (Element) node;
                if (childElement.getTagName().equals(childName)) {
                    matches.add(childElement);
                }
            }