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)>
```