SPCconv func(int64) string
}

var spcSpace []spcSet

// RegisterSpecialOperands binds a pretty-printer (SPCconv) for special
// operand numbers to a given special operand number range. Lo is inclusive,
// hi is exclusive (valid special operands are lo through hi-1).
func RegisterSpecialOperands(lo, hi int64, rlconv func(int64) string) {
	spcSpace = append(spcSpace, spcSet{lo, hi, rlconv})
}