Set<Feature<?>> moreAbsentFeatures = moreRequirements.getAbsentFeatures();
    checkConflict("absent", absentFeatures, "present", morePresentFeatures, source);
    checkConflict("present", presentFeatures, "absent", moreAbsentFeatures, source);
    presentFeatures.addAll(morePresentFeatures);
    absentFeatures.addAll(moreAbsentFeatures);
    return requirements;
  }

                Arguments.of(NbtException.ERR_SSN_SRVC, NbtException.CALLED_NOT_PRESENT, "ERR_SSN_SRVC/Called name not present"),
                Arguments.of(NbtException.ERR_SSN_SRVC, NbtException.NO_RESOURCES,
                        "ERR_SSN_SRVC/Called name present, but insufficient resources"),
                Arguments.of(NbtException.ERR_SSN_SRVC, NbtException.UNSPECIFIED, "ERR_SSN_SRVC/Unspecified error"),

         */
        boolean isResolved();

        /**
         * Indicates whether the requested artifact is not present in any of the specified repositories.
         *
         * @return {@code true} if the artifact is not present in any repository, {@code false} otherwise.
         */
        boolean isMissing();
    }

  SUPPORTS_PUT,
  SUPPORTS_REMOVE,
  FAILS_FAST_ON_CONCURRENT_MODIFICATION,
  /**
   * Indicates that the constructor or factory method of a map, usually an immutable map, throws an
   * {@link IllegalArgumentException} when presented with duplicate keys instead of discarding all
   * but one.
   */
  REJECTS_DUPLICATES_AT_CREATION,

  GENERAL_PURPOSE(SUPPORTS_PUT, SUPPORTS_REMOVE);

  private final Set<Feature<? super Map>> implied;

    _failedRoutes.add(failedRoute)
  }

  /** Records success connecting to [route]. */
  @Synchronized fun connected(route: Route) {
    _failedRoutes.remove(route)
  }

  /** Returns true if [route] has failed recently and should be avoided. */
  @Synchronized fun shouldPostpone(route: Route): Boolean = route in _failedRoutes

        + nodes()
        + ", edges: "
        + edgeIncidentNodesMap(this);
  }

  /**
   * Returns a {@link Set} whose methods throw {@link IllegalStateException} when the given edge is
   * not present in this network.
   *
   * @since 33.1.0
   */
  protected final <T> Set<T> edgeInvalidatableSet(Set<T> set, E edge) {
    return InvalidatableSet.of(

    return keyComparator;
  }

  @Override
  public Comparator<? super V> valueComparator() {
    return valueComparator;
  }

  /**
   * @since 14.0 (present with return type {@code SortedSet} since 2.0)
   */
  @Override
  @GwtIncompatible // NavigableSet
  public NavigableSet<V> get(@ParametricNullness K key) {
    return (NavigableSet<V>) super.get(key);
  }

            MetadataGraph res = new MetadataGraph(vertices.size());
            res.setVersionedVertices(false);
            res.setScopedVertices(false);

            MetadataGraphVertex resEntry = res.addVertex(entry.getMd());
            res.setEntry(resEntry);

            res.setScope(requestedScope);

            for (MetadataGraphVertex v : vertices) {
                final List<MetadataGraphEdge> ins = graph.getIncidentEdges(v);

    expectAdded(entry(null, v3()));
  }

  @MapFeature.Require(SUPPORTS_PUT)
  @CollectionSize.Require(absent = ZERO)
  public void testMergePresent() {
    assertEquals(
        "Map.merge(present, value, function) should return function result",
        v4(),
        getMap()
            .merge(
                k0(),
                v3(),
                (oldV, newV) -> {

        assertTrue(
                !message.contains("[WARNING]") || message.contains("[WARNING] Deprecated plugin usage"),
                "Warnings should be filtered when errors are present or shown if explicitly included");
    }

    @Test
    void testExceptionMessageWithOnlyWarnings() {
        List<ProjectBuildingResult> results = new ArrayList<>();