[bug#53317] how to test it

[Attila Lendvai]

you can test it using:

```

$ ./pre-inst-env guix shell guile guile-srfi-189 -- guile

GNU Guile 3.0.7

[...]

scheme@(guile-user)> (use-modules (srfi srfi-189))

scheme@(guile-user)> (nothing)

$1 = #<<nothing>>

scheme@(guile-user)>

```