R Under development (unstable) (2024-02-16 r85931 ucrt) -- "Unsuffered Consequences"
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> library("R.rsp")
R.rsp v0.46.0 successfully loaded. See ?R.rsp for help.
> 
> path <- system.file("rsp_tests", package="R.rsp")
> pathname <- file.path(path, "recursive.txt.rsp")
> print(pathname)
[1] "D:/RCompile/CRANincoming/R-devel/lib/R.rsp/rsp_tests/recursive.txt.rsp"
> 
> R.utils::withTimeout({
+   res <- try({ rcat(file=pathname) })
+   stopifnot(inherits(res, "try-error"))
+ }, timeout=30L)
Error in preprocess.RspDocument(doc, envir = envir, ..., verbose = less(verbose,  : 
  Too many nested RSP 'include' preprocessing directives. This indicates an endless recursive loop of including the same file over and over. This was detected while trying to include 'D:/RCompile/CRANincoming/R-devel/lib/R.rsp/rsp_tests/recursive.txt.rsp' (file='recursive.txt.rsp' with type='application/x-rsp') in RSP document 'D:/RCompile/CRANincoming/R-devel/lib/R.rsp/rsp_tests/recursive.txt.rsp'.
> 
> proc.time()
   user  system elapsed 
   1.20    0.35    1.54