Duh! :(
So there is another issue, I'll fix it.

Regarding the `guix pull` discussion: it seems that `--dry-run` does not
build the package cache (beside many other things) and thus it does not
catch many errors.

So the trick of running

--8<---------------cut here---------------start------------->8---
  guix pull --url=... --dry-run
--8<---------------cut here---------------end--------------->8---

does *not* work :(

Shouldn't we change --dry-run so that it does *everything* except
updating the symlink of the guix checkout profile?

-- 
Pierre Neidhardt
https://ambrevar.xyz/