R Under development (unstable) (2024-06-20 r86796 ucrt) -- "Unsuffered Consequences"
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> require(salad)
Loading required package: salad

Attaching package: 'salad'

The following object is masked from 'package:stats':

    dnorm

> 
> A <- prod(dual(1:5))
> A0 <- new("dual", x = 120, d = structure(list(x1 = 120, x2 = 60, x3 = 40, 
+     x4 = 30, x5 = 24), class = "differential"))
> 
> stopifnot(salad:::test_near_equality(A, A0, 0))
> 
> # mb <- microbenchmark::microbenchmark(prod(dual(1:5)), times = 1000)
> # print(mb)
> 
> proc.time()
   user  system elapsed 
   0.31    0.03    0.28