R Under development (unstable) (2024-02-28 r85999 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> source("incl/start.R")
> stopCluster <- parallel::stopCluster
> 
> message("*** Connections ...")
*** Connections ...
> 
> con <- stdin()
> idx <- as.integer(con)
> id <- connectionId(con)
> valid <- isConnectionValid(con)
> stopifnot(inherits(con, "connection"), idx == 0L, id == 0L, isTRUE(valid))
> 
> con <- stdout()
> idx <- as.integer(con)
> id <- connectionId(con)
> valid <- isConnectionValid(con)
> stopifnot(inherits(con, "connection"), idx == 1L, id == 1L, isTRUE(valid))
> 
> con <- stderr()
> idx <- as.integer(con)
> id <- connectionId(con)
> valid <- isConnectionValid(con)
> stopifnot(inherits(con, "connection"), idx == 2L, id == 2L, isTRUE(valid))
> 
> message("- Connections cannot be serialized")
- Connections cannot be serialized
> 
> con <- file(tempfile(), open = "w")
> x <- list(value = 42, stderr = stderr(), con = con)
> y <- unserialize(serialize(x, connection = NULL))
> print(connectionId(x$stderr))
[1] 2
> print(connectionId(x$con))
[1] 71
attr(,"raw_id")
[1] "<pointer: 0x0000000000000047>"
> print(isConnectionValid(x$stderr))
[1] TRUE
> print(isConnectionValid(x$con))
[1] TRUE
> print(connectionId(y$stderr))
[1] 2
> print(connectionId(y$con))
[1] -1
> print(isConnectionValid(y$stderr))
[1] TRUE
> print(isConnectionValid(y$con))
[1] FALSE
attr(,"reason")
[1] "Connection (connection: index=3, description=\"D:\\temp\\RtmpWyno5f\\fileb7b477fe45ed\", class=\"file\", mode=\"w\", text=\"text\", opened=\"opened\", can read=\"no\", can write=\"yes\", id=-1) is no longer valid. It differ from the currently registered R connection with the same index 3 (connection: index=3, description=\"D:\\temp\\RtmpWyno5f\\fileb7b477fe45ed\", class=\"file\", mode=\"w\", text=\"text\", opened=\"opened\", can read=\"no\", can write=\"yes\", id=71, raw_id=\"<pointer: 0x0000000000000047>\")"
> 
> stopifnot(
+   identical(y$value, x$value),
+   connectionId(x$stderr) == 2L,
+   isConnectionValid(x$stderr),
+   isConnectionValid(y$stderr),
+   identical(connectionId(y$stderr), connectionId(x$stderr)),
+   connectionId(x$con) >= 3L,
+   isConnectionValid(x$con),
+   connectionId(y$con) == -1L,
+   !isConnectionValid(y$con)
+ )
> close(con)
> 
> message("*** Connections ... DONE")
*** Connections ... DONE
> 
> source("incl/end.R")
> 
> proc.time()
   user  system elapsed 
   0.25    0.03    0.21