const unicode/utf8.RuneError

67 uses

	unicode/utf8 (current package)
		utf8.go#L16: 	RuneError = '\uFFFD'     // the "error" Rune or "Unicode replacement character"
		utf8.go#L65: 	runeErrorByte0 = t3 | (RuneError >> 12)
		utf8.go#L66: 	runeErrorByte1 = tx | (RuneError>>6)&maskx
		utf8.go#L67: 	runeErrorByte2 = tx | RuneError&maskx
		utf8.go#L160: 		return RuneError, 0
		utf8.go#L169: 		return rune(p[0])&^mask | RuneError&mask, 1
		utf8.go#L174: 		return RuneError, 1
		utf8.go#L178: 		return RuneError, 1
		utf8.go#L185: 		return RuneError, 1
		utf8.go#L192: 		return RuneError, 1
		utf8.go#L208: 		return RuneError, 0
		utf8.go#L217: 		return rune(s[0])&^mask | RuneError&mask, 1
		utf8.go#L222: 		return RuneError, 1
		utf8.go#L226: 		return RuneError, 1
		utf8.go#L233: 		return RuneError, 1
		utf8.go#L240: 		return RuneError, 1
		utf8.go#L256: 		return RuneError, 0
		utf8.go#L280: 		return RuneError, 1
		utf8.go#L296: 		return RuneError, 0
		utf8.go#L320: 		return RuneError, 1

	bufio
		scan.go#L301: var errorRune = []byte(string(utf8.RuneError))

	bytes
		bytes.go#L144: 	case r == utf8.RuneError:
		bytes.go#L147: 			if r1 == utf8.RuneError {
		bytes.go#L231: 				if r == utf8.RuneError {
		bytes.go#L245: 			r = utf8.RuneError
		bytes.go#L270: 		if r != utf8.RuneError {
		bytes.go#L318: 				if r == utf8.RuneError {
		bytes.go#L332: 			cr = utf8.RuneError
		bytes.go#L354: 		if r != utf8.RuneError {

	crypto/x509
		verify.go#L1128: 		if c == utf8.RuneError {

	encoding/json
		decode.go#L1217: 		if rr == utf8.RuneError && size == 1 {
		encode.go#L1023: 		if c == utf8.RuneError && size == 1 {

	fmt
		format.go#L471: 		r = utf8.RuneError
		format.go#L482: 		r = utf8.RuneError

	github.com/google/go-cmp/cmp
		report_slices.go#L121: 			if (unicode.IsPrint(r) || unicode.IsSpace(r)) && r != utf8.RuneError {

	go.uber.org/zap/zapcore
		json_encoder.go#L557: 	if r == utf8.RuneError && size == 1 {

	go/scanner
		scanner.go#L73: 			if r == utf8.RuneError && w == 1 {

	golang.org/x/net/idna
		idna10.0.0.go#L444: 			return s, bidi, runeError(utf8.RuneError)
		idna10.0.0.go#L492: 				err = runeError(utf8.RuneError)
		idna10.0.0.go#L635: 			return runeError(utf8.RuneError)

	google.golang.org/protobuf/internal/encoding/json
		decode_string.go#L29: 		case r == utf8.RuneError && n == 1:
		encode.go#L98: 		case r == utf8.RuneError && n == 1:
		encode.go#L134: 		if r < ' ' || r == '\\' || r == '"' || r == utf8.RuneError {

	google.golang.org/protobuf/internal/encoding/text
		decode_string.go#L61: 		case r == utf8.RuneError && n == 1:
		encode.go#L124: 		case r == utf8.RuneError && n == 1:

	path
		match.go#L222: 	if r == utf8.RuneError && n == 1 {

	path/filepath
		match.go#L225: 	if r == utf8.RuneError && n == 1 {

	regexp
		onepass.go#L59: 	for iop(i) == syntax.InstRune && len(i.Rune) == 1 && syntax.Flags(i.Arg)&syntax.FoldCase == 0 && i.Rune[0] != utf8.RuneError {
		regexp.go#L277: 			if r == utf8.RuneError {

	regexp/syntax
		parse.go#L2103: 		if rune == utf8.RuneError && size == 1 {
		parse.go#L2113: 	if c == utf8.RuneError && size == 1 {
		prog.go#L160: 	for i.op() == InstRune && len(i.Rune) == 1 && Flags(i.Arg)&FoldCase == 0 && i.Rune[0] != utf8.RuneError {

	strconv
		quote.go#L46: 		if width == 1 && r == utf8.RuneError {
		quote.go#L61: 		r = utf8.RuneError
		quote.go#L222: 		if r == utf8.RuneError {
		quote.go#L440: 				valid = len("'")+n+len("'") == end && (r != utf8.RuneError || n != 1)

	strings
		strings.go#L132: 	case r == utf8.RuneError:
		strings.go#L134: 			if r == utf8.RuneError {
		strings.go#L210: 			r = utf8.RuneError
		strings.go#L243: 			rc = utf8.RuneError
		strings.go#L263: 			rc = utf8.RuneError
		strings.go#L539: 		if r == c && c != utf8.RuneError {
		strings.go#L544: 		if c == utf8.RuneError {
		strings.go#L790: 		if c != utf8.RuneError {

	vendor/golang.org/x/net/idna
		idna10.0.0.go#L444: 			return s, bidi, runeError(utf8.RuneError)
		idna10.0.0.go#L492: 				err = runeError(utf8.RuneError)
		idna10.0.0.go#L635: 			return runeError(utf8.RuneError)