[bug#46672] [PATCH] gnu: Add usync.

["Léo Le Bouter via Guix-patches via" <guix-patches@gnu.org>]

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Hello!

Somehow after applying your patch and running "$ ./pre-inst-env guix
lint usync" the following error appears, probably syntax error
somewhere, can't figure it out though, can you take a look?

I ran something like this to apply the patch on current GNU Guix master
(a2ece4da1fdccb9e94681e38a3f3a79b0d43e061):

$ curl https://issues.guix.gnu.org/issue/46572/raw/0 | git am

Backtrace:
In ice-9/boot-9.scm:
  1736:10 19 (with-exception-handler _ _ #:unwind? _ # _)
In guix/store.scm:
   636:37 18 (thunk)
   1305:8 17 (call-with-build-handler #<procedure 7f72e83a5360 at i…>
…)
In guix/scripts/build.scm:
    499:2 16 (_)
In srfi/srfi-1.scm:
   673:15 15 (append-map _ _ . _)
   586:17 14 (map1 ((argument . "usync") (build-mode . 0) (# . #t) …))
In guix/scripts/build.scm:
   519:30 13 (_ _)
In gnu/packages.scm:
    477:2 12 (%find-package "usync" "usync" #f)
    362:6 11 (find-best-packages-by-name _ _)
   292:55 10 (_ "usync" _)
In unknown file:
           9 (force #<promise #<procedure 7f72e82e9fc0 at gnu/packag…>)
In gnu/packages.scm:
   239:33  8 (fold-packages #<procedure 7f72e414cf18 at gnu/package…>
…)
In guix/discovery.scm:
   153:11  7 (all-modules _ #:warn _)
In srfi/srfi-1.scm:
   460:18  6 (fold #<procedure 7f72e83aa760 at guix/discovery.scm:1…>
…)
In guix/discovery.scm:
   143:19  5 (_ _ ())
In srfi/srfi-1.scm:
   691:23  4 (filter-map #<procedure 7f72e83aa740 at guix/discove…> .
#)
In guix/discovery.scm:
   118:22  3 (_ . _)
In ice-9/eval.scm:
    619:8  2 (_ #(#(#<directory (guix ui) 7f72e9e08500> (# "re…" …))))
In ice-9/boot-9.scm:
  1669:16  1 (raise-exception _ #:continuable? _)
  1669:16  0 (raise-exception _ #:continuable? _)

ice-9/boot-9.scm:1669:16: In procedure raise-exception:
Throw to key `match-error' with args `("match" "no matching pattern"
(unbound-variable "resolve-interface" "no binding `~A' in module ~A"
(python (gnu packages python)) #f))'.

Thank you!

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