Re: Meaning of symbol prefixed with "#$"

[N. Y.]

Thanks so much for your suggestion! Can I ask for a name for these
notations, #~ and #$? I would like to learn more about them, but they are
difficult to Google for.

On Fri, May 26, 2023 at 7:17 PM Ricardo Wurmus <rekado@elephly.net> wrote:

>
> (Moving this to help-guix instead of guile-user.)
>
> "N. Y." <ningyuan.sg@gmail.com> writes:
>
> > (arguments
> >   '(#:phases (modify-phases %standard-phases
> >     (add-after 'unpack 'amend-version
> >       (lambda _
> >         (substitute* "setup.py"
> >           (("versioneer.get_version\\(\\)")
> >           (string-append "\"" #$version "\"")))))
>
> You can only use #$ inside an expression starting with #~.  This should
> work:
>
> --8<---------------cut here---------------start------------->8---
> (arguments
>   (list
>     #:phases
>     #~(modify-phases %standard-phases
>        (add-after 'unpack 'amend-version
>          (lambda _
>            (substitute* "setup.py"
>              (("versioneer.get_version\\(\\)")
>              (string-append "\"" #$version "\""))))))))
> --8<---------------cut here---------------end--------------->8---
>
> --
> Ricardo
>