R Under development (unstable) (2023-11-16 r85542 ucrt) -- "Unsuffered Consequences"
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> library("R.utils")
Loading required package: 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 v1.25.0 (2022-06-12 02:20:02 UTC) 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

R.utils v2.12.3 successfully loaded. See ?R.utils for help.

Attaching package: 'R.utils'

The following object is masked from 'package:utils':

    timestamp

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

    cat, commandArgs, getOption, isOpen, nullfile, parse, warnings

> 
> x <- list()
> 
> x$case1 <- env({
+  # Cut'n'pasted from elsewhere
+  a <- 1
+  b <- 2
+ })
> 
> x$case2 <- env({
+  # Cut'n'pasted from elsewhere
+  foo <- function(x) x^2
+  a <- foo(2)
+  b <- 1
+  rm(foo) # Not needed anymore
+ })
> 
> # Turn into a list of lists
> x <- lapply(x, FUN=as.list)
> 
> str(x)
List of 2
 $ case1:List of 2
  ..$ b: num 2
  ..$ a: num 1
 $ case2:List of 2
  ..$ b: num 1
  ..$ a: num 4
> 
> proc.time()
   user  system elapsed 
   0.25    0.12    0.35