}
	if s == "" {
		return "", fmt.Errorf("empty string")
	}
	const illegalChars = `!"#$%&'()*,:;<=>?[\]^{|}` + "`\uFFFD"
	for _, r := range s {
		if !unicode.IsGraphic(r) || unicode.IsSpace(r) || strings.ContainsRune(illegalChars, r) {
			return s, fmt.Errorf("invalid character %#U", r)
		}
	}
	return s, nil
}

// declarePkgObj declares obj in the package scope, records its ident -> obj mapping,

	}
	if s == "" {
		return "", fmt.Errorf("empty string")
	}
	const illegalChars = `!"#$%&'()*,:;<=>?[\]^{|}` + "`\uFFFD"
	for _, r := range s {
		if !unicode.IsGraphic(r) || unicode.IsSpace(r) || strings.ContainsRune(illegalChars, r) {
			return s, fmt.Errorf("invalid character %#U", r)
		}
	}
	return s, nil
}

// declarePkgObj declares obj in the package scope, records its ident -> obj mapping,

	{[]byte("a☺b☻c☹d"), '☻', true},
	{[]byte("aRegExp*"), '*', true},
}

func TestContainsRune(t *testing.T) {
	for _, ct := range ContainsRuneTests {
		if ContainsRune(ct.b, ct.r) != ct.expected {
			t.Errorf("ContainsRune(%q, %q) = %v, want %v",
				ct.b, ct.r, !ct.expected, ct.expected)
		}
	}
}

func TestContainsFunc(t *testing.T) {
	for _, ct := range ContainsRuneTests {

		for _, flag := range state.flags {
			// TODO: Disable complaint about '0' for Go 1.10. To be fixed properly in 1.11.
			// See issues 23598 and 23605.
			if flag == '0' {
				continue
			}
			if !strings.ContainsRune(v.flags, rune(flag)) {
				pass.ReportRangef(call, "%s format %s has unrecognized flag %c", state.name, state.format, flag)
				return false
			}
		}
	}

		p.expect('*')
		p.expect('/')
	}

	name := p.parseName()
	f := types.NewFunc(token.NoPos, pkg, name, p.parseFunctionType(pkg, nil))
	p.skipInlineBody()

	if name[0] == '.' || name[0] == '<' || strings.ContainsRune(name, '$') {
		// This is an unexported function,
		// or a function defined in a different package,
		// or a type$equal or type$hash function.
		// We only want to record exported functions.
		return nil
	}

	return enc.encode
}

func isValidTag(s string) bool {
	if s == "" {
		return false
	}
	for _, c := range s {
		switch {
		case strings.ContainsRune("!#$%&()*+-./:;<=>?@[]^_{|}~ ", c):
			// Backslash and quote chars are reserved, but
			// otherwise any punctuation chars are allowed
			// in a tag name.
		case !unicode.IsLetter(c) && !unicode.IsDigit(c):

	}
	// This is valid for AWS S3 but it will never
	// work with file systems, we will reject here
	// to return object name invalid rather than
	// a cryptic error from the file system.
	return !strings.ContainsRune(object, 0)
}

// checkObjectNameForLengthAndSlash -check for the validity of object name length and prefis as slash
func checkObjectNameForLengthAndSlash(bucket, object string) error {

			if m.objSize == 0 {
				m.objSize = ei.V2Obj.Size
			}
			m.data = ei.V2Obj.EcM
			m.parity = ei.V2Obj.EcN
			if len(ei.V2Obj.PartNums) == 1 && !strings.ContainsRune(ei.V2Obj.MetaUsr.Etag, '-') {
				m.wantMD5 = ei.V2Obj.MetaUsr.Etag
			}
			if m.shards == 0 {
				m.shards = m.data + m.parity
			}
			idx = ei.V2Obj.EcIndex - 1

				chars = "0123456789ABCDEF"
			default:
				pattern = "PTR"
				chars = "0123456789abcdefABCDEF"
			}
			p := s[:i] + pattern
			for j := i; j < len(s); j++ {
				if !strings.ContainsRune(chars, rune(s[j])) {
					p += s[j:]
					break
				}
			}
			s = p
		}
		if s != tt.out {
			if _, ok := tt.val.(string); ok {
				// Don't requote the already-quoted strings.

	// U+FFFD."
	if s == "" {
		return lit
	}
	const illegalChars = `!"#$%&'()*,:;<=>?[\]^{|}` + "`\uFFFD"
	for _, r := range s {
		if !unicode.IsGraphic(r) || unicode.IsSpace(r) || strings.ContainsRune(illegalChars, r) {
			return lit
		}
	}

	// otherwise, return the double-quoted path
	s = strconv.Quote(s)
	if s == lit.Value {
		return lit // nothing wrong with lit
	}