out.w--
				}
			case !rooted:
				// cannot backtrack, but not rooted, so append .. element.
				if out.w > 0 {
					out.append(Separator)
				}
				out.append('.')
				out.append('.')
				dotdot = out.w
			}
		default:
			// real path element.
			// add slash if needed
			if rooted && out.w != 1 || !rooted && out.w != 0 {
				out.append(Separator)
			}

var getHostname = os.Hostname // variable for testing

type dnsConfig struct {
	servers       []string      // server addresses (in host:port form) to use
	search        []string      // rooted suffixes to append to local name
	ndots         int           // number of dots in name to trigger absolute lookup
	timeout       time.Duration // wait before giving up on a query, including retries

// uses slash separated paths.
func WalkDir(root string, fn fs.WalkDirFunc) error {
	info, err := os.Lstat(root)
	if err != nil {
		err = fn(root, nil, err)
	} else {
		err = walkDir(root, fs.FileInfoToDirEntry(info), fn)
	}
	if err == SkipDir || err == SkipAll {
		return nil
	}
	return err
}

// Walk walks the file tree rooted at root, calling fn for each file or

)

func IsPathSeparator(c uint8) bool {
	return c == '\\' || c == '/'
}

func isLocal(path string) bool {
	if path == "" {
		return false
	}
	if IsPathSeparator(path[0]) {
		// Path rooted in the current drive.
		return false
	}
	if stringslite.IndexByte(path, ':') >= 0 {
		// Colons are only valid when marking a drive letter ("C:foo").
		// Rejecting any path with a colon is conservative but safe.

func (conf *dnsConfig) nameList(name string) []string {
	// Check name length (see isDomainName).
	l := len(name)
	rooted := l > 0 && name[l-1] == '.'
	if l > 254 || l == 254 && !rooted {
		return nil
	}

	// If name is rooted (trailing dot), try only that name.
	if rooted {
		if avoidDNS(name) {
			return nil
		}
		return []string{name}
	}

        when:
        def outputFile = compiler.getOutputFileDir(sourceFile, testDir, extension)

        then:
        // Creates directory
        outputFile.parentFile.exists()
        // Rooted under test directory
        outputFile.parentFile.parentFile == testDir
        // TODO: Test for MD5 directory name?
        outputFile.name == "source$extension"

        where:
        extension | _

		// Rather than calling BytesOrPanic, we explicitly handle this error, in
		// order to provide a reasonable error message. It should be basically
		// impossible for this to panic, and routing errors back through the
		// tree rooted in this function is quite painful. The labels are fixed
		// size, and the context is either a fixed-length computed hash, or
		// parsed from a field which has the same length limitation. As such, an

		if err != nil {
			t.Fatalf("Open(%q) failed: %v", test, err)
		}
		dir.Close()
	}
}

func testMkdirAllAtRoot(t *testing.T, root string) {
	// Create a unique-enough directory name in root.
	base := fmt.Sprintf("%s-%d", t.Name(), os.Getpid())
	path := filepath.Join(root, base)
	if err := os.MkdirAll(path, 0777); err != nil {
		t.Fatalf("MkdirAll(%q) failed: %v", path, err)
	}
	// Clean up

	Short:     "package lists and patterns",
	Long: `
Many commands apply to a set of packages:

	go <action> [packages]

Usually, [packages] is a list of import paths.

An import path that is a rooted path or that begins with
a . or .. element is interpreted as a file system path and
denotes the package in that directory.

Otherwise, the import path P denotes the package found in

// but may produce false positives on non-trivial paths.
func pathNeedsClean(path []byte) bool {
	if len(path) == 0 {
		return true
	}

	rooted := path[0] == '/'
	n := len(path)

	r, w := 0, 0
	if rooted {
		r, w = 1, 1
	}

	for r < n {
		switch {
		case path[r] > 127:
			// Non ascii.
			return true
		case path[r] == '/':
			// multiple / elements