comma := strings.IndexRune(value, ',')
			if comma < 0 {
				continue
			}

			// If the character before a comma is a space, this is suspicious.
			if comma > 0 && value[comma-1] == ' ' {
				return errTagValueSpace
			}
			value = value[comma+1:]
		case "json":
			// JSON allows using spaces in the name, so skip it.
			comma := strings.IndexRune(value, ',')
			if comma < 0 {
				continue

func TrimFunc(s string, f func(rune) bool) string {
	return TrimRightFunc(TrimLeftFunc(s, f), f)
}

// IndexFunc returns the index into s of the first Unicode
// code point satisfying f(c), or -1 if none do.
func IndexFunc(s string, f func(rune) bool) int {
	return indexFunc(s, f, true)
}

// LastIndexFunc returns the index into s of the last
// Unicode code point satisfying f(c), or -1 if none do.

	}
	for _, tt := range tests {
		if got := IndexRune(tt.in, tt.rune); got != tt.want {
			t.Errorf("IndexRune(%q, %d) = %v; want %v", tt.in, tt.rune, got, tt.want)
		}
	}

	haystack := "test世界"
	allocs := testing.AllocsPerRun(1000, func() {
		if i := IndexRune(haystack, 's'); i != 2 {
			t.Fatalf("'s' at %d; want 2", i)
		}
		if i := IndexRune(haystack, '世'); i != 4 {
			t.Fatalf("'世' at %d; want 4", i)

	fmt.Println(strings.IndexByte("gophers", 'h'))
	fmt.Println(strings.IndexByte("golang", 'x'))
	// Output:
	// 0
	// 3
	// -1
}
func ExampleIndexRune() {
	fmt.Println(strings.IndexRune("chicken", 'k'))
	fmt.Println(strings.IndexRune("chicken", 'd'))
	// Output:
	// 4
	// -1
}

func ExampleLastIndex() {
	fmt.Println(strings.Index("go gopher", "go"))
	fmt.Println(strings.LastIndex("go gopher", "go"))

	var r []string
	for _, str := range pv {
		if str != "" {
			str = strings.ReplaceAll(str, escapedPathSeparator, pathSeparator)
			// Is str of the form node[expr], convert to "node", "[expr]"?
			nBracket := strings.IndexRune(str, '[')
			if nBracket > 0 {
				r = append(r, str[:nBracket], str[nBracket:])
			} else {
				// str is "[expr]" or "node"
				r = append(r, str)
			}
		}
	}
	return r
}

// has been uploaded using the S3 singlepart API.
//
// Parts may panic if the ETag is an invalid multipart
// ETag.
func (e ETag) Parts() int {
	if !e.IsMultipart() {
		return 1
	}

	n := bytes.IndexRune(e, '-')
	parts, err := strconv.Atoi(string(e[n+1:]))
	if err != nil {
		panic(err) // malformed ETag
	}
	return parts
}

// Format returns an ETag that is formatted as specified
// by AWS S3.
//

			break
		}
		s.buf.writeRune(r)
	}
	return s.buf
}

var errComplex = errors.New("syntax error scanning complex number")
var errBool = errors.New("syntax error scanning boolean")

func indexRune(s string, r rune) int {
	for i, c := range s {
		if c == r {
			return i
		}
	}
	return -1
}

// consume reads the next rune in the input and reports whether it is in the ok string.

	var r []string
	for _, str := range pv {
		if str != "" {
			str = strings.ReplaceAll(str, EscapedPathSeparator, PathSeparator)
			// Is str of the form node[expr], convert to "node", "[expr]"?
			nBracket := strings.IndexRune(str, '[')
			if nBracket > 0 {
				r = append(r, str[:nBracket], str[nBracket:])
			} else {
				// str is "[expr]" or "node"
				r = append(r, str)
			}
		}
	}
	return r
}

	}
	for _, tt := range tests {
		if got := IndexRune([]byte(tt.in), tt.rune); got != tt.want {
			t.Errorf("IndexRune(%q, %d) = %v; want %v", tt.in, tt.rune, got, tt.want)
		}
	}

	haystack := []byte("test世界")
	allocs := testing.AllocsPerRun(1000, func() {
		if i := IndexRune(haystack, 's'); i != 2 {
			t.Fatalf("'s' at %d; want 2", i)
		}
		if i := IndexRune(haystack, '世'); i != 4 {

parseField:
	for {
		if r.TrimLeadingSpace {
			i := bytes.IndexFunc(line, func(r rune) bool {
				return !unicode.IsSpace(r)
			})
			if i < 0 {
				i = len(line)
				pos.col -= lengthNL(line)
			}
			line = line[i:]
			pos.col += i
		}
		if len(line) == 0 || line[0] != '"' {
			// Non-quoted string field
			i := bytes.IndexRune(line, r.Comma)
			field := line
			if i >= 0 {