R Under development (unstable) (2024-05-22 r86590 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> source("helper/helper.R")
> 
> wb = function(...) backports:::...names()
> 
> if (exists("...names", envir = baseenv()) && getRversion() > "4.1.2") {
+   f = get("...names", envir = baseenv())
+   wf = function(...) f()
+   expect_same = makeCompareFun(wf, wb)
+ 
+   expect_same(1, 2)
+   expect_same(a = 1)
+   expect_same(1, b = 2)
+   expect_same()
+ 
+   expect_identical(wb(a = 1, 2), c("a", ""))
+ }
> 
> expect_identical(wb(a = 1, b = 2), c("a", "b"))
> 
> 
> # issue 64
> bp_...names = getFromNamespace("...names", "backports")
> 
> test1 <- function(...) {
+   ...names()
+ }
> 
> test2 <- function(...) {
+   bp_...names()
+ }
> 
> expect_identical(
+   test1("ABC"),
+   test2("ABC")
+ )
> 
> expect_identical(
+   test1(a = "b", ),
+   test2(a = "b", )
+ )
> 
> proc.time()
   user  system elapsed 
   0.20    0.10    0.29