Hi,

Currently no substitutes are built for the testing branch because the
evaluation fails. The log at https://ci.guix.gnu.org/eval/16794/log/raw
ends with:

--8<---------------cut here---------------start------------->8---
Generating package cache for '/gnu/store/shv4x9d7ghpxgvxira3hy85hs3c2b73j-profile'...
(values (value "/gnu/store/wgclirmri8k1ipgyxwwxh9glig66mfvd-guix-package-cache/lib/guix/package.cache"))
@ build-succeeded /gnu/store/n4ipmdc02n8g02g5d1jysf07dq51vsfq-guix-package-cache.drv -
@ build-started /gnu/store/jq8cw17rywlb9ab0ln2cn9icywmblp1z-profile.drv - x86_64-linux /var/log/guix/drvs/jq//8cw17rywlb9ab0ln2cn9icywmblp1z-profile.drv.gz 30881
@ build-succeeded /gnu/store/jq8cw17rywlb9ab0ln2cn9icywmblp1z-profile.drv -
Backtrace:
In ice-9/boot-9.scm:
  1736:10  8 (with-exception-handler _ _ #:unwind? _ # _)
In unknown file:
           7 (apply-smob/0 #<thunk 7f07a90835c0>)
In ice-9/boot-9.scm:
    718:2  6 (call-with-prompt _ _ #<procedure default-prompt-handle?>)
In ice-9/eval.scm:
    619:8  5 (_ #(#(#<directory (guile-user) 7f07a8ca5f00>)))
   293:34  4 (_ #(#(#(#(#(#(#(#(#(#(#(?) ?) ?) ?) ?) ?) ?) ?) ?) ?) ?))
    159:9  3 (_ _)
    159:9  2 (_ _)
In guix/utils.scm:
    705:8  1 (call-with-temporary-directory _)
In guix/inferior.scm:
    247:2  0 (_ _)

guix/inferior.scm:247:2: ERROR:
  1. &inferior-exception:
      arguments: (keyword-argument-error #f "Unrecognized keyword" () (#:builder))
      inferior: #<<inferior> pid: pipe socket: #<input-output: string 7f07952ae690> close: #<procedure close-pipe (p)> version: (0 1 1) packages: #<promise #<procedure 7f07951d62c0 at guix/inferior.scm:162:32 ()>> table: #<promise #<procedure 7f079e960480 at guix/inferior.scm:163:32 ()>>>
      stack: ((#f ("ice-9/boot-9.scm" 1763 13)) (raise-exception ("ice-9/boot-9.scm" 1666 16)) (raise-exception ("ice-9/boot-9.scm" 1668 16)) (#f ("guix/build-system/asdf.scm" 279 2)) (thunk ("guix/packages.scm" 1397 22)) (package-derivation ("guix/packages.scm" 1079 16)) (job ("gnu/ci.scm" 383 24)) (filter-map ("srfi/srfi-1.scm" 690 23)) (#f ("gnu/ci.scm" 497 31)) (map1 ("srfi/srfi-1.scm" 585 17)) (append-map ("srfi/srfi-1.scm" 672 15)) (hydra-jobs ("gnu/ci.scm" 482 4)) (#f ("ice-9/eval.scm" 158 9)) (#f ("ice-9/eval.scm" 158 9)) (with-exception-handler ("ice-9/boot-9.scm" 1735 10)) (call-with-prompt ("ice-9/boot-9.scm" 717 2)) (dynamic-wind ("ice-9/boot-9.scm" 141 2)) (#f (#f #f #f)) (#f ("guix/repl.scm" 92 21)) (with-exception-handler ("ice-9/boot-9.scm" 1735 10)) (with-exception-handler ("ice-9/boot-9.scm" 1730 15)) (#f ("guix/repl.scm" 119 7)))
--8<---------------cut here---------------end--------------->8---

If I understand this correctly, there's a '#:builder' keyword somewhere
that is causing a problem. Does someone know where it can come from, or
how to fix the issue?

Thanks.