R Under development (unstable) (2025-05-01 r88184 ucrt) -- "Unsuffered Consequences"
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> library("R.cache")
R.cache v0.17.0 successfully loaded. See ?R.cache for help.
> 
> options(R.cache.rootPath = NULL)
> 
> ## -----------------------------------------------
> ## DEPRECATED & DEFUNCT
> ## -----------------------------------------------
> options("R.cache.path"="foo")
> res <- tryCatch(getCacheRootPath(), error = identity)
> print(res)
<defunctError in getCacheRootPath.default(): R.cache option 'R.cache::path' has been renamed to 'R.cache.rootPath'>
> stopifnot(inherits(res, "error"))
> options("R.cache.path"=NULL)
> 
> Sys.setenv("R_CACHE_PATH"="foo")
> res <- tryCatch(getCacheRootPath(), error = identity)
> print(res)
<defunctError in getCacheRootPath.default(): R.cache environment variable 'R_CACHE_PATH' is deprecated. Use option 'R.cache.rootPath' instead>
> stopifnot(inherits(res, "error"))
> Sys.setenv("R_CACHE_PATH"="")
> 
> proc.time()
   user  system elapsed 
   0.18    0.04    0.21