// (Content ID in the new content-based build IDs.)
		const marker = `build id "`
		i := bytes.Index(data, []byte(marker))
		if i < 0 {
			t.Fatal("cannot find build id in archive")
		}
		j := bytes.IndexByte(data[i+len(marker):], '"')
		if j < 0 {
			t.Fatal("cannot find build id in archive")
		}
		i += len(marker) + j - 1
		if data[i] == 'a' {
			data[i] = 'b'
		} else {
			data[i] = 'a'
		}

// with the replacement text repl.
// Inside repl, $ signs are interpreted as in [Regexp.Expand].
func (re *Regexp) ReplaceAll(src, repl []byte) []byte {
	n := 2
	if bytes.IndexByte(repl, '$') >= 0 {
		n = 2 * (re.numSubexp + 1)
	}
	srepl := ""
	b := re.replaceAll(src, "", n, func(dst []byte, match []int) []byte {
		if len(srepl) != len(repl) {
			srepl = string(repl)
		}

		// of uinptrs this function consumes. Store the argsize and discard
		// the %n suffix if any.
		m.argsize = -1
		extName := ldr.SymExtname(s)
		if i := strings.IndexByte(extName, '%'); i >= 0 {
			var err error
			m.argsize, err = strconv.Atoi(extName[i+1:])
			if err != nil {
				ctxt.Errorf(s, "failed to parse stdcall decoration: %v", err)
			}

		kv := env[n-1]

		// Reject NUL in environment variables to prevent security issues (#56284);
		// except on Plan 9, which uses NUL as os.PathListSeparator (#56544).
		if !nulOK && strings.IndexByte(kv, 0) != -1 {
			err = errors.New("exec: environment variable contains NUL")
			continue
		}

		i := strings.Index(kv, "=")
		if i == 0 {

			return ""
		}
		i += lenp + k + 1
		if c := sub[lenp+k]; c == '\'' || c == '"' {
			sep = c
			break
		}
	}
	if sep == 0 {
		return ""
	}
	j := strings.IndexByte(s[i:], sep)
	if j < 0 {
		return ""
	}
	return s[i : i+j]

}

// needed for re-marshaling tests
func (u unmarshalerText) MarshalText() ([]byte, error) {
	return []byte(u.A + ":" + u.B), nil
}

func (u *unmarshalerText) UnmarshalText(b []byte) error {
	pos := bytes.IndexByte(b, ':')
	if pos == -1 {
		return errors.New("missing separator")
	}
	u.A, u.B = string(b[:pos]), string(b[pos+1:])
	return nil
}

var _ encoding.TextUnmarshaler = (*unmarshalerText)(nil)

		t.Errorf("Log differs after %d common lines.\n\nGot:\n%s\n\nWant:\n%s\n", lines, got, want)
	}
}

func removeCommonLines(a, b string) (asuffix, bsuffix string, commonLines int) {
	for {
		nl := strings.IndexByte(a, '\n')
		if nl < 0 {
			return a, b, commonLines
		}
		line := a[:nl+1]
		if !strings.HasPrefix(b, line) {
			return a, b, commonLines
		}
		commonLines++
		a = a[len(line):]

	}
}

type indenter struct {
	c *common
}

func (w indenter) Write(b []byte) (n int, err error) {
	n = len(b)
	for len(b) > 0 {
		end := bytes.IndexByte(b, '\n')
		if end == -1 {
			end = len(b)
		} else {
			end++
		}
		// An indent of 4 spaces will neatly align the dashes with the status
		// indicator of the parent.
		line := b[:end]

	if !bytes.HasPrefix(data[i:], []byte("ok  \t")) {
		if cache.DebugTest {
			fmt.Fprintf(os.Stderr, "testcache: %s: test output malformed\n", a.Package.ImportPath)
		}
		return false
	}
	j := bytes.IndexByte(data[i+len("ok  \t"):], '\t')
	if j < 0 {
		if cache.DebugTest {
			fmt.Fprintf(os.Stderr, "testcache: %s: test output malformed\n", a.Package.ImportPath)
		}
		return false
	}

		prefix := "type:"
		if name[5] == '.' {
			prefix = "type:."
		}
		return prefix + base64.StdEncoding.EncodeToString(hash[:6])
	}
	// instantiated symbol, replace type name in []
	i := strings.IndexByte(name, '[')
	j := strings.LastIndexByte(name, ']')
	if j == -1 || j <= i {
		j = len(name)
	}
	hash := notsha256.Sum256([]byte(name[i+1 : j]))