message("TESTING: local()...") library("R.oo") setConstructorS3("Foo", function() { extend(Object(), "Foo") }) setMethodS3("finalize", "Foo", function(this, ...) { cat("Finalized Foo\n") }) x <- Foo() print(x) # Trigger finalizer via garbage collection rm(list="x") gc() 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() }) message("TESTING: local()...DONE")