R Under development (unstable) (2024-10-31 r87283 ucrt) -- "Unsuffered Consequences"
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> message("TESTING: attachLocally()...")
TESTING: attachLocally()...
> 
> 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 v1.27.0 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(object, arg1="some value", ...) {
+   cat("Local objects in foo():\n")
+   print(ls())
+ 
+   attachLocally(object)
+ 
+   cat("\nLocal objects in foo():\n")
+   print(ls())
+ 
+   for (name in ls()) {
+     cat("\nObject '", name, "':\n", sep="")
+     print(get(name, inherits=FALSE))
+   }
+ }
> 
> a <- "A string"
> obj <- Object()
> obj$a <- "Another string"
> obj$b <- NA
> foo(obj)
Local objects in foo():
[1] "arg1"   "object"

Local objects in foo():
[1] "a"      "arg1"   "b"      "object"

Object 'a':
[1] "Another string"

Object 'arg1':
[1] "some value"

Object 'b':
[1] NA

Object 'object':
[1] "Object: 0x000001cdf5766ae0"
> print(a)
[1] "A string"
> 
> message("TESTING: attachLocally()...DONE")
TESTING: attachLocally()...DONE
> 
> proc.time()
   user  system elapsed 
   0.32    0.07    0.39