How to matching guix records outside the module where they are defined?

[Development of GNU Guix and the GNU System distribution.]

On 7/14/26 19:07, civodul wrote:

+            <system76-power-configuration>
As a rule of thumb, we generally don't export record type descriptors 
<https://guix.gnu.org/manual/devel/en/html_node/Data-Types-and-Pattern- 
Matching.html>.

I experimented with creating better graphs[1] and my first attempt 
failed miserably, because I started with a new `mygraph.scm` in which I 
copied the `export-graph` procedure.  But that procedure looks like this:

(define* (export-graph  backend)
  (match backend
    (($ <graph-backend> _ _ emit-prologue emit-epilogue emit-node 
emit-edge)
     ...

and I could only make that work by exporting `<graph-backend>` in my 
local guix clone.

Is there a way to write such a procedure that matches a record without 
having it placed in the module that defines the record?

Thanks,

Hugo

[1] WIP for better graphs: https://codeberg.org/guix/guix/pulls/9725