R version 4.4.0 beta (2024-04-09 r86391 ucrt) -- "Puppy Cup"
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Platform: x86_64-w64-mingw32/x64

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> library("matrixStats")
> 
> diff2_R <- function(..., useNames=NA){
+   res <- diff(...)
+   if (is.na(useNames) || !useNames) names(res) <- NULL
+   res
+ }
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # Subsetted tests
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> source("utils/validateIndicesFramework.R")
> x <- runif(6, min = -6, max = 6)
> for (setNames in c(TRUE, FALSE)) {
+   if (setNames) names(x) <- LETTERS[1:6]
+   else names(x) <- NULL
+   for (l in 1:2) {
+     for (d in 1:2) {
+       for (idxs in index_cases) {
+         for (useNames in c(if (!matrixStats:::isUseNamesNADefunct()) NA, TRUE, FALSE)) {
+           validateIndicesTestVector(x, idxs,
+                                     ftest = diff2, fsure = diff2_R,
+                                     lag = l, differences = d, useNames = useNames)
+         }
+       }
+     }
+   }
+ }
> 
> proc.time()
   user  system elapsed 
   0.21    0.00    0.21