}

  @Override
  public boolean equals(@Nullable Object obj) {
    if (obj == this) {
      return true;
    }
    if (obj instanceof FunctionalEquivalence) {
      FunctionalEquivalence<?, ?> that = (FunctionalEquivalence<?, ?>) obj;
      return function.equals(that.function) && resultEquivalence.equals(that.resultEquivalence);
    }
    return false;
  }

  @Override

            if (node2.metadata == null) {
                return metadata == null;
            }

            return metadata != null && metadata.toString().equals(node2.metadata.toString());
        } else {
            return super.equals(obj);
        }
    }

    @Override
    public int hashCode() {
        if (metadata == null) {
            return super.hashCode();
        }

        return metadata.toString().hashCode();

      Object target = endpointPair.target();
      return (node.equals(source) && successorsOrEmpty(node).contains(target))
          || (node.equals(target) && predecessorsOrEmpty(node).contains(source));
    } else {
      Set<N> adjacent = graph.adjacentNodes(node);
      Object nodeU = endpointPair.nodeU();
      Object nodeV = endpointPair.nodeV();

      return (node.equals(nodeV) && adjacent.contains(nodeU))

                }
                if ("fess_config".equals(index)) {
                    index = fessConfig.getIndexConfigIndex();
                } else if ("fess_user".equals(index)) {
                    index = fessConfig.getIndexUserIndex();
                } else if ("fess_basic_config".equals(index) && !"fess_config".equals(fessConfig.getIndexConfigIndex())) {

        int e = stackTrace.length;

        for (int i = s; i < e; i++) {
            final StackTraceElement se = stackTrace[i];

            if (i == s && SmbTreeImpl.class.getName().equals(se.getClassName()) && "close".equals(se.getMethodName())) {
                s++;
                continue;
            }

            if (se.getClassName().startsWith("org.junit.runners.")) {
                e = i - 4;

            Element plugins = build.child("plugins").orElse(null);

            Element cleanPlugin = plugins.children("plugin")
                    .filter(p -> "maven-clean-plugin"
                            .equals(p.child("artifactId").orElse(null).textContent()))
                    .findFirst()
                    .orElse(null);
            assertNotNull(cleanPlugin);

            }

            private boolean isQualifiedForInterpolation(Field field, Class<?> fieldType) {
                if (Map.class.equals(fieldType) && "locations".equals(field.getName())) {
                    return false;
                }
                if (InputLocation.class.equals(fieldType)) {
                    return false;
                }

                //noinspection SimplifiableIfStatement

   */
  protected boolean standardIsEmpty() {
    return !entrySet().iterator().hasNext();
  }

  /**
   * A sensible definition of {@link #equals} in terms of the {@code equals} method of {@link
   * #entrySet}. If you override {@link #entrySet}, you may wish to override {@link #equals} to
   * forward to this implementation.
   *
   * @since 7.0
   */
  protected boolean standardEquals(@Nullable Object object) {

    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        AbstractLanguageElement that = (AbstractLanguageElement) o;
        return Objects.equals(rawCommentText, that.rawCommentText) &&
            Objects.equals(annotationNames, that.annotationNames);
    }

     */
    public boolean equals(Object other) {
        if (this == other) {
            return true;
        } else if (other instanceof ToolchainModel that) {
            return java.util.Objects.equals(this.getType(), that.getType())
                && java.util.Objects.equals(this.getProvides(), that.getProvides());
        } else {
            return false;
        }