AtomicBoolean alreadyFoundASymlink = new AtomicBoolean(false);
        children.stream()
            .map(child -> child.getValue().relocate(targetPath + File.separatorChar + child.getPath(), interner)
                .map(relocatedSnapshot -> new ChildMap.Entry<FileSystemLocationSnapshot>(child.getPath(), relocatedSnapshot)))
            .forEach(relocatedChild -> {
                if (!alreadyFoundASymlink.get()) {

        expect:
        assertNodesAccessing("/some", ancestor, child, grandChild)
        assertNodesAccessing("/some/location", ancestor, child, grandChild)
        assertNodesAccessing("/some/location/child/within", ancestor, child, grandChild)
        assertNodesAccessing("/some/location/child/other", ancestor)
    }

    def "ancestor accesses location"() {

class NestedModelRuleDescriptor extends AbstractModelRuleDescriptor {

    private final ModelRuleDescriptor parent;
    private final ModelRuleDescriptor child;

    public NestedModelRuleDescriptor(ModelRuleDescriptor parent, ModelRuleDescriptor child) {
        this.parent = parent;
        this.child = child;
    }

    @Override
    public void describeTo(Appendable appendable) {
        parent.describeTo(appendable);
        try {

        T newChild = handler.handleAsDescendantOfChild(targetPath.pathFromChild(childPath), child);
        return withReplacedChild(newChild);
    }

    @Override
    public ChildMap<T> handleAsAncestorOfChild(VfsRelativePath targetPath, String childPath, T child) {
        T newChild = handler.handleAsAncestorOfChild(childPath, child);

        def outerBuild = new BuildTestFile(testDirectory, "root")
        def childBuild = new BuildTestFile(testDirectory.file("child"), "child")

        outerBuild.settingsFile << """
            includeBuild 'child'
        """
        outerBuild.file('buildSrc/src/main/java/Thing.java') << """
            class Thing {
                Thing() { System.out.println("outer thing"); }

            addedNodes.add(node)
        }
    }

    String selectedChildPath
    /**
     * The child, if any, which has a common prefix with the selected path.
     */
    FileSystemNode selectedChild

    abstract protected NODE createInitialRootNode(ChildMap<CHILD> children);

    abstract protected CHILD mockChild()

    void setupTest(VirtualFileSystemTestSpec spec) {

            RESULT handleAsAncestorOfChild(VfsRelativePath targetPath, String childPath, T child);
            RESULT handleExactMatchWithChild(VfsRelativePath targetPath, String childPath, T child);
            RESULT handleSiblingOfChild(VfsRelativePath targetPath, String childPath, T child, int commonPrefixLength);

        for (ClassNode child : classNode.getChildren()) {
            writeLibraryAccessorClass(child, deprecated);
            writeLibrarySubClasses(child, deprecated);
        }
    }

    private void writeVersionSubClasses(ClassNode classNode) throws IOException {
        for (ClassNode child : classNode.getChildren()) {
            writeVersionAccessorClass(child);
            writeVersionSubClasses(child);

//	NewRootObjectFunc().Index().Child("foo") == [{"foo": x}]
//	NewRootObjectFunc().Index().Child("foo").Child("bar") == [{"foo": {"bar":x}}]
//	NewRootObjectFunc().Index().Child("foo").Child("bar").Index() == [{"foo": {"bar":[x]}}]
//
// and:
//
//	NewRootObjectFunc(), then acc(x) == x
//	NewRootObjectFunc().Index(), then acc([x]) == x
//	NewRootObjectFunc().Index().Child("foo"), then acc([{"foo": x}]) == x

        Optional<RESULT> invalidatedChild = handler.handleAsDescendantOfChild(pathInChild, child);
        return invalidatedChild
            .map(this::withReplacedChild)
            .orElseGet(this::withRemovedChild);
    }

    @Override
    public ChildMap<RESULT> handleAsAncestorOfChild(String childPath, T child) {
        handler.handleAsAncestorOfChild(childPath, child);