(unmatched-parenthesis via Guix-patches via schreef op zo 23-01-2022 om
13:38 [+0000]:
> +      (version (git-version "0.4.1" revision commit))
> +      (source
> +       (origin
> +         (method git-fetch)
> +         (uri (git-reference
> +               (url "https://github.com/nim-lang/nim-mode")
> +               (commit version)))

I don't think there's a tag by the name "0.4.1-23.744e076"
in the git repo.  Try (git-reference ... (commit commit)) instead.

Greetings,
Maxime.