* gnu/packages/golang.scm (xurls): New variable.

> --- a/gnu/packages/golang.scm
> +++ b/gnu/packages/golang.scm

> @@ -9760,6 +9760,38 @@ (define-public go-go-uber-org-multierr

> +    (arguments
> +     `(#:import-path "mvdan.cc/xurls/v2"
> +       #:unpack-path "mvdan.cc/xurls/v2"
> +       #:phases (modify-phases %standard-phases
> +                  (replace 'build
> +                    (lambda arguments
> +                      (apply (assoc-ref %standard-phases
> +                                        'build)
> +                             `(,@arguments #:import-path
> +                               "mvdan.cc/xurls/v2/cmd/xurls")))))))

I'm not certain what you're trying to accomplish here, but would you be able
to replace this with:

  (arguments
   `(#:import-path "mvdan.cc/xurls/v2"
     #:unpack-path "mvdan.cc/xurls/v2/cmd/xurls"))

?

> +    (inputs (list go-golang-org-x-sync go-github-com-rogpeppe-go-internal))

Add newlines after the ``inputs'' symbol and between the inputs :)

> +    (description
> +     "Xurls extracts urls from plain text using regular expressions.  It can
> +be used as both a binary and a library.")

s/Xurls extracts/This package provides a Go library for extracting/

    -- (