func TokenString(tok rune) string {
	if s, ok := tokenString[tok]; ok {
		return s
	}
	return fmt.Sprintf("%q", string(tok))
}
func TokenString(tok rune) string {
	if s, ok := tokenString[tok]; ok {
		return s
	}
	return fmt.Sprintf("%q", string(tok))
}
func TokenString ( tok rune ) string { if s , ok := tokenString [ tok ] ; ok { return s } return fmt . Sprintf ( " " , string ( tok ) ) }
// TokenString returns a printable string for a token or Unicode character.
TokenString returns a printable string for a token or Unicode character .