func (i Identifier) String() string {
	s := string(i)
	if reSimple.MatchString(s) {
		return s
	}
	return strconv.Quote(s)
}
func (i Identifier) String() string {
	s := string(i)
	if reSimple.MatchString(s) {
		return s
	}
	return strconv.Quote(s)
}
func ( i Identifier ) String ( ) string { s := string ( i ) if reSimple . MatchString ( s ) { return s } return strconv . Quote ( s ) }
// String implements Stringer interface.
String implements Stringer interface .