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

> 
> pkg <- Package("datasets")
> load(pkg)
[1] TRUE
> print(isLoaded(pkg))
[1] TRUE
> unload(pkg)
> print(isLoaded(pkg))
[1] FALSE
> 
> message("TESTING: Package unloading...DONE")
TESTING: Package unloading...DONE
> 
> proc.time()
   user  system elapsed 
   0.15    0.14    0.28