func MaxLength(pow int) Option {
	if pow <= 0 || pow > 30 {
		panic("demangle: invalid MaxLength value")
	}
	return Option(pow << maxLengthShift)
}

// isMaxLength reports whether an Option holds a maximum length.
func isMaxLength(opt Option) bool {
	return opt&maxLengthMask != 0
}

// maxLength returns the maximum length stored in an Option.
func maxLength(opt Option) int {

	max := 0
	for _, o := range options {
		switch {
		case o == NoTemplateParams:
			tparams = false
		case o == NoEnclosingParams:
			enclosingParams = false
		case o == LLVMStyle:
			llvmStyle = true
		case isMaxLength(o):
			max = maxLength(o)
		}
	}

	ps := printState{
		tparams:         tparams,
		enclosingParams: enclosingParams,
		llvmStyle:       llvmStyle,
		max:             max,
		scopes:          1,
	}