R Under development (unstable) (2025-06-05 r88281 ucrt) -- "Unsuffered Consequences"
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> source("incl/start.R")
Loading required package: parallelly
Loading required package: future
> library("listenv")
> 
> message("*** batchtools_local() ...")
*** batchtools_local() ...
> 
> message("*** batchtools_local() without globals")
*** batchtools_local() without globals
> 
> f <- batchtools_local({
+   42L
+ })
[04:37:21.557] Launched future #1
> stopifnot(inherits(f, "BatchtoolsFuture"))
> 
> ## Check whether a batchtools_local future is resolved
> ## or not will force evaluation
> print(is_resolved <- resolved(f))
[1] TRUE
> stopifnot(is_resolved)
> 
> y <- value(f)
> print(y)
[1] 42
> stopifnot(y == 42L)
> 
> 
> message("*** batchtools_local() with globals")
*** batchtools_local() with globals
> ## A global variable
> a <- 0
> f <- batchtools_local({
+   b <- 3
+   c <- 2
+   a * b * c
+ })
[04:37:23.152] Launched future #1
> 
> ## Although 'f' is a batchtools_local future and therefore
> ## resolved/evaluates the future expression only
> ## when the value is requested, any global variables
> ## identified in the expression (here 'a') are
> ## "frozen" at the time point when the future is
> ## created.  Because of this, 'a' preserved the
> ## zero value although we reassign it below
> a <- 7  ## Make sure globals are frozen
> v <- value(f)
> print(v)
[1] 0
> stopifnot(v == 0)
> 
> 
> message("*** batchtools_local() with globals (tricky)")
*** batchtools_local() with globals (tricky)
> x <- listenv()
> for (ii in 1:2) x[[ii]] <- batchtools_local({ ii }, globals = TRUE)
[04:37:24.979] Launched future #1
[04:37:26.103] Launched future #1
> v <- unlist(value(x))
> stopifnot(all(v == 1:2))  ## Make sure globals are frozen
> 
> 
> message("*** batchtools_local() and errors")
*** batchtools_local() and errors
> f <- batchtools_local({
+   stop("Whoops!")
+   1
+ })
[04:37:27.635] Launched future #1
> v <- value(f, signal = FALSE)
Warning in delete.BatchtoolsFuture(future) :
  Will not remove batchtools registry, because the status of the batchtools was 'error', 'defined', 'finished', 'started', 'submitted' and option 'future.delete' is FALSE or running in an interactive session: 'D:/temp/2025_06_06_04_35_16_24916/RtmpimuSmu/.future/20250606_043719-imuSmu/batchtools_1439723328'
> print(v)
<simpleError in eval(quote({    {        stop("Whoops!")        1    }}), new.env()): Whoops!>
> stopifnot(inherits(v, "simpleError"))
> 
> res <- try({ v <- value(f) }, silent = TRUE)
> print(res)
[1] "Error in eval(quote({ : Whoops!\n"
attr(,"class")
[1] "try-error"
attr(,"condition")
<simpleError in eval(quote({    {        stop("Whoops!")        1    }}), new.env()): Whoops!>
> stopifnot(inherits(res, "try-error"))
> 
> ## Error is repeated
> res <- try(value(f), silent = TRUE)
> print(res)
[1] "Error in eval(quote({ : Whoops!\n"
attr(,"class")
[1] "try-error"
attr(,"condition")
<simpleError in eval(quote({    {        stop("Whoops!")        1    }}), new.env()): Whoops!>
> stopifnot(inherits(res, "try-error"))
> 
> message("*** batchtools_local() ... DONE")
*** batchtools_local() ... DONE
> 
> source("incl/end.R")
> 
> proc.time()
   user  system elapsed 
   1.62    0.48    9.75 
Warning message:
In delete.BatchtoolsFuture(f, onRunning = "skip", onMissing = "ignore",  :
  Will not remove batchtools registry, because the status of the batchtools was 'error', 'defined', 'finished', 'started', 'submitted' and option 'future.delete' is FALSE or running in an interactive session: 'D:/temp/2025_06_06_04_35_16_24916/RtmpimuSmu/.future/20250606_043719-imuSmu/batchtools_1439723328'