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

> 
> # A named list
> x <- list(a=1, b=base::letters)
> keys <- attachLocally(x)
> stopifnot(identical(keys, names(x)))
> for (key in keys) stopifnot(identical(get(key), x[[key]]))
> 
> 
> # A list with "empty" names
> x <- list(a=1, b=base::letters, "noname", "another one")
> keys <- attachLocally(x)
> stopifnot(identical(keys, setdiff(names(x), "")))
> for (key in keys) stopifnot(identical(get(key), x[[key]]))
> 
> # An environment
> x <- list(a=1, b=base::letters)
> env <- list2env(x)
> stopifnot(identical(ls(envir=env), names(x)))
> keys <- attachLocally(env)
> stopifnot(identical(keys, ls(envir=env)))
> for (key in keys) stopifnot(identical(get(key), env[[key]]))
> 
> # A data.frame
> df <- data.frame(a=1, b=base::letters, stringsAsFactors=FALSE)
> keys <- attachLocally(df)
> stopifnot(identical(keys, names(df)))
> for (key in keys) stopifnot(identical(get(key), df[[key]]))
> 
> proc.time()
   user  system elapsed 
   0.23    0.12    0.34