/**
     * Invalidates part of the node.
     */
    @CheckReturnValue
    Optional<FileSystemNode> invalidate(VfsRelativePath targetPath, CaseSensitivity caseSensitivity, SnapshotHierarchy.NodeDiffListener diffListener);

    abstract protected boolean isSameNodeType(FileSystemNode node)

    abstract boolean isAllowEmptyChildren()

    def "invalidate child with no common pathToParent has no effect (#vfsSpec)"() {
        setupTest(vfsSpec)

        expect:
        initialRoot.invalidate(searchedPath, CASE_SENSITIVE, diffListener).get() is initialRoot
        removedNodes.empty
        addedNodes.empty

        where:

			runtime.KeepAlive(c.ptr.m)
			return sum
		}
	}
}

func (c *Counter) invalidate() {
	for {
		state := c.state.load()
		if !state.havePtr() {
			debugPrintf("invalidate %s: no ptr\n", c.name)
			return
		}
		if c.state.update(&state, state.clearHavePtr()) {
			debugPrintf("invalidate %s: cleared havePtr\n", c.name)
			return
		}
	}
}

func (c *Counter) refresh() {

 * @since 10.0
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public enum RemovalCause {
  /**
   * The entry was manually removed by the user. This can result from the user invoking {@link
   * Cache#invalidate}, {@link Cache#invalidateAll(Iterable)}, {@link Cache#invalidateAll()}, {@link
   * Map#remove}, {@link ConcurrentMap#remove}, or {@link Iterator#remove}.
   */
  EXPLICIT {
    @Override
    boolean wasEvicted() {

    interface VfsStorer {
        FileSystemLocationSnapshot store(FileSystemLocationSnapshot snapshot);
    }

    /**
     * Removes any information at the absolute paths from the VFS.
     */
    void invalidate(Iterable<String> locations);

    /**
     * Removes any information from the VFS.
     */
    void invalidateAll();

    /**
     * Output with all upgraded properties, merged from multiple projects in to one file.
     * This is also used in InstrumentingClasspathFileTransformer to invalidate instrumentation cache on changes. So output must be stable.
     */
    @get:OutputFile
    abstract val upgradedProperties: RegularFileProperty

    @TaskAction
    fun mergeUpgradedProperties() {

        when:
        allowFileSystemAccess(false)
        def subDir = someDir.file("sub")
        snapshot = read(subDir)
        then:
        assertIsDirectorySnapshot(snapshot, subDir)
    }

    def "invalidate regular file"() {
        def parentDir = temporaryFolder.file("in/some")
        def someFile = parentDir.file("directory/somefile.txt").createFile()
        when:
        allowFileSystemAccess(true)

		}
		// Recover and propagate panics from seq.
		defer func() {
			if p := recover(); p != nil {
				panicValue = p
			} else if !seqDone {
				panicValue = goexitPanicValue
			}
			done = true // Invalidate iterator
			race.Release(unsafe.Pointer(&racer))
		}()
		seq(yield)
		var v0 V
		v, ok = v0, false
		seqDone = true
	})
	next = func() (v1 V, ok1 bool) {
		race.Write(unsafe.Pointer(&racer)) // detect races

 * {@code get}; {@link #getAllPresent} is implemented in terms of {@code getIfPresent}; {@link
 * #putAll} is implemented in terms of {@link #put}, {@link #invalidateAll(Iterable)} is implemented
 * in terms of {@link #invalidate}. The method {@link #cleanUp} is a no-op. All other methods throw
 * an {@link UnsupportedOperationException}.
 *
 * @author Charles Fry
 * @since 11.0
 */
@GwtIncompatible
@ElementTypesAreNonnullByDefault

    }

    /**
     * The macOS native watcher reports the canonical path for watched paths.
     * That means that we would not invalidate the right locations in the virtual file system on macOS.
     * Therefore, we disable file system watching when we try to watch a directory whose parent is a symlink.
     *