R Under development (unstable) (2024-01-23 r85822 ucrt) -- "Unsuffered Consequences"
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> message("TESTING: local()...")
TESTING: local()...
> 
> 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

> 
> setConstructorS3("Foo", function() {
+   extend(Object(), "Foo")
+ })
> 
> setMethodS3("finalize", "Foo", function(this, ...) {
+   cat("Finalized Foo\n")
+ })
NULL
> 
> x <- Foo()
> print(x)
[1] "Foo: 0x000001c66101e810"
> 
> # Trigger finalizer via garbage collection
> rm(list="x")
> gc()
Finalized Foo
         used (Mb) gc trigger (Mb) max used (Mb)
Ncells 396969 21.3     817258 43.7   633877 33.9
Vcells 719157  5.5    8388608 64.0  2002878 15.3
> 
> 
> 
> local({
+ 
+ setConstructorS3("Bar", function() {
+   extend(Object(), "Bar")
+ })
+ 
+ setMethodS3("finalize", "Bar", function(this, ...) {
+   cat("Finalized Bar\n")
+ })
+ 
+ x <- Bar()
+ print(x)
+ 
+ # Trigger finalizer via garbage collection
+ rm(list="x")
+ gc()
+ 
+ })
[1] "Bar: 0x000001c66378e298"
         used (Mb) gc trigger (Mb) max used (Mb)
Ncells 397315 21.3     817258 43.7   633877 33.9
Vcells 719423  5.5    8388608 64.0  2002878 15.3
> 
> message("TESTING: local()...DONE")
TESTING: local()...DONE
> 
> proc.time()
   user  system elapsed 
   0.26    0.17    0.36