before, after, found := bytes.Cut([]byte(s), []byte(sep))
		fmt.Printf("Cut(%q, %q) = %q, %q, %v\n", s, sep, before, after, found)
	}
	show("Gopher", "Go")
	show("Gopher", "ph")
	show("Gopher", "er")
	show("Gopher", "Badger")
	// Output:
	// Cut("Gopher", "Go") = "", "pher", true
	// Cut("Gopher", "ph") = "Go", "er", true
	// Cut("Gopher", "er") = "Goph", "", true
	// Cut("Gopher", "Badger") = "Gopher", "", false
}

pkg bufio, method (*Writer) AvailableBuffer() []uint8
pkg bufio, method (ReadWriter) AvailableBuffer() []uint8
pkg bytes, func Cut([]uint8, []uint8) ([]uint8, []uint8, bool)
pkg bytes, func Title //deprecated
pkg crypto/tls, method (*Conn) NetConn() net.Conn
pkg crypto/tls, type Config struct, PreferServerCipherSuites //deprecated
pkg crypto/x509, method (*CertPool) Subjects //deprecated
pkg debug/buildinfo, func Read(io.ReaderAt) (*debug.BuildInfo, error)

			}
			return i + j
		}
	}
	return -1
}

// Cut slices s around the first instance of sep,
// returning the text before and after sep.
// The found result reports whether sep appears in s.
// If sep does not appear in s, cut returns s, nil, false.
//
// Cut returns slices of the original slice s, not copies.
func Cut(s, sep []byte) (before, after []byte, found bool) {
	if i := Index(s, sep); i >= 0 {

	teamID = getenv("GOIOS_TEAM_ID")

	// Device IDs as listed with ios-deploy -c.
	deviceID = os.Getenv("GOIOS_DEVICE_ID")

	if _, id, ok := strings.Cut(appID, "."); ok {
		bundleID = id
	}

	if err := signApp(appdir); err != nil {
		return err
	}

	if err := uninstallDevice(bundleID); err != nil {
		return err
	}

	var nonblank []string
	for i, line := range lines {
		line = strings.TrimSpace(line)
		if line == "" || strings.HasPrefix(line, "#") {
			continue
		}
		if needApproval {
			feature, approval, ok := strings.Cut(line, "#")
			if !ok {
				log.Printf("%s:%d: missing proposal approval\n", filename, i+1)
				exitCode = 1
			} else {
				_, err := strconv.Atoi(approval)
				if err != nil {

		}

		// The prefix field should never appear in the GNU format.
		var blk block
		copy(blk[:], b.Bytes())
		prefix := string(blk.toUSTAR().prefix())
		prefix, _, _ = strings.Cut(prefix, "\x00") // Truncate at the NUL terminator
		if blk.getFormat() == FormatGNU && len(prefix) > 0 && strings.HasPrefix(name, prefix) {
			t.Errorf("test %d, found prefix in GNU format: %s", i, prefix)
		}