func (c *Cursor) FormatMask(mask rune) string {
	r := make([]rune, len(c.input))
	for i := range r {
		r[i] = mask
	}
	return format(r, c)
}
func (c *Cursor) FormatMask(mask rune) string {
	r := make([]rune, len(c.input))
	for i := range r {
		r[i] = mask
	}
	return format(r, c)
}
func ( c * Cursor ) FormatMask ( mask rune ) string { r := make ( [ ] rune , len ( c . input ) ) for i := range r { r [ i ] = mask } return format ( r , c ) }
// FormatMask replaces all input runes with the mask rune.
FormatMask replaces all input runes with the mask rune .