Method arith

vm.go:9–20

(rb, rc value, op tm)

)

func (l *State) arith(rb, rc value, op tm) value {
	if b, ok := l.toNumber(rb); ok {
		if c, ok := l.toNumber(rc); ok {
			return arith(Operator(op-tmAdd)+OpAdd, b, c)
		}
	}
	if result, ok := l.callBinaryTagMethod(rb, rc, op); ok {
		return result
	}
	l.arithError(rb, rc)
	return nil
}

func (l *State) tableAt(t value, key value) value {
	for loop := 0; loop < maxTagLoop; loop++ {