R Under development (unstable) (2023-11-19 r85561 ucrt) -- "Unsuffered Consequences"
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> ## Regression test for bug reported by John Nolan:
> ##
> ## Whenever the pair (x[i], a[i]) == (0,1), NA would be returned, due
> ## to an internal computation of ( 0 * -Inf ) => NaN
> ##
> ## The code now checks for this particular issue and sets the value of
> ## ( 0 * -Inf ) to 0, which is correct for this calculation.
> ##
> library(gtools)
> 
> x <- c(0, 0, 1)
> alpha <- c(1, 2, 3)
> 
> stopifnot(ddirichlet(x = x, alpha = alpha) == 0)
> 
> proc.time()
   user  system elapsed 
   0.18    0.09    0.26