Function safeAdd

ext/costs.go:106–115

(x, y uint64, rest ...uint64)

}

func safeAdd(x, y uint64, rest ...uint64) uint64 {
	if y > 0 && x > math.MaxUint64-y {
		return math.MaxUint64
	}
	next := x + y
	if len(rest) == 0 {
		return next
	}
	return safeAdd(next, rest[0], rest[1:]...)
}

func safeMul(x, y uint64) uint64 {
	if y != 0 && x > math.MaxUint64/y {