bug#53165: "guix import opam coq-of-ocaml" unexpected error

[zimoun]

Hi,

For some reasons, the Opam importer is failing for coq-of-ocaml:

--8<---------------cut here---------------start------------->8---
$ guix import opam coq-of-ocaml

Starting download of /tmp/guix-file.058Nel
>From 
>https://github.com/clarus/coq-of-ocaml/releases/download/2.5.1/coq-of-ocaml-full.2.5.1.tar.gz...
following redirection to 
`https://github.com/foobar-land/coq-of-ocaml/releases/download/2.5.1/coq-of-ocaml-full.2.5.1.tar.gz'...
following redirection to 
`https://objects.githubusercontent.com/github-production-release-asset-2e65be/14023027/b17b0f80-d4ea-11eb-8861-d8d0c56a130f?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWNJYAX4CSVEH53A%2F20220110%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20220110T165945Z&X-Amz-Expires=300&X-Amz-Signature=7422a35182a4ae9cf511471dca445a65316a70e8baa7ffefc9381ce3588002da&X-Amz-SignedHeaders=host&actor_id=0&key_id=0&repo_id=14023027&response-content-disposition=attachment%3B%20filename%3Dcoq-of-ocaml-full.2.5.1.tar.gz&response-content-type=application%2Foctet-stream'...
 …ll.2.5.1.tar.gz  2.3MiB            44.3MiB/s 00:00 [##################] 100.0%
Backtrace:
           8 (primitive-load "/home/simon/.config/guix/current/bin/guix")
In guix/ui.scm:
   2206:7  7 (run-guix . _)
  2169:10  6 (run-guix-command _ . _)
In guix/scripts/import.scm:
   124:11  5 (guix-import . _)
In guix/scripts/import/opam.scm:
   105:23  4 (guix-import-opam . _)
In guix/build/utils.scm:
    251:8  3 (call-with-temporary-output-file #<procedure 7ff70d73d500 at 
guix/import/opam.scm:348:12 (temp port)>)
In guix/import/opam.scm:
   374:37  2 (_ _ _)
In guix/import/utils.scm:
   244:19  1 (beautify-description #f _)
In unknown file:
           0 (string-prefix? "A " #f #<undefined> #<undefined> #<undefined> 
#<undefined>)

ERROR: In procedure string-prefix?:
In procedure string-prefix?: Wrong type argument in position 2 (expecting 
string): #f
--8<---------------cut here---------------end--------------->8---


Cheers,
simon