R Under development (unstable) (2024-01-23 r85822 ucrt) -- "Unsuffered Consequences"
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> message("TESTING: abort()...")
TESTING: abort()...
> 
> library("R.oo")
Loading required package: R.methodsS3
R.methodsS3 v1.8.2 (2022-06-13 22:00:14 UTC) successfully loaded. See ?R.methodsS3 for help.
R.oo v1.26.0 successfully loaded. See ?R.oo for help.

Attaching package: 'R.oo'

The following object is masked from 'package:R.methodsS3':

    throw

The following objects are masked from 'package:methods':

    getClasses, getMethods

The following objects are masked from 'package:base':

    attach, detach, load, save

> 
> foo <- function() {
+   cat("foo()...\n")
+   on.exit(cat("foo()...done\n"))
+   tryCatch({
+     stop("Woops!")
+   }, error = function(ex) {
+     cat("An error was caught: ", ex$message, "\n", sep="")
+   })
+   cat("Continuing...\n")
+ }
> 
> bar <- function() {
+   cat("bar()...\n")
+   on.exit(cat("bar()...done\n"))
+   tryCatch({
+     abort("Woops!")
+   }, error = function(ex) {
+     cat("An error was caught: ", ex$message, "\n", sep="")
+   })
+   cat("This message will never be displayed...\n")
+ }
> 
> # An error generated by stop() can be caught
> foo()
foo()...
An error was caught: Woops!
Continuing...
foo()...done
> 
> ## abort() will abort covr::package_coverage() and
> ## and any other evaluations beyond this point.
> if (!"covr" %in% loadedNamespaces() && FALSE) {
+ # ...which is not possible when using abort()
+ bar()
+ 
+ # This expression is never reached
+ cat("This line will never be outputted.\n")
+ } #
> 
> message("TESTING: abort()...DONE")
TESTING: abort()...DONE
> 
> proc.time()
   user  system elapsed 
   0.26    0.06    0.31