bug#28265: guix system build fails

[Efraim Flashner]

address@hidden:~/workspace/guix$ time nice ./pre-inst-env guix system build 
~/lightweight-desktop.scm
Backtrace:
          11 (primitive-load "/home/efraim/workspace/guix/scripts/gu…")
In guix/ui.scm:
  1331:12 10 (run-guix-command _ . _)
In ice-9/boot-9.scm:
    837:9  9 (catch _ _ #<procedure 7f4e83aea8c0 at guix/ui.scm:448…> …)
    837:9  8 (catch _ _ #<procedure 7f4e83aea8d8 at guix/ui.scm:536…> …)
In guix/scripts/system.scm:
   1022:8  7 (_)
    905:6  6 (process-action _ _ _)
In guix/store.scm:
  1441:24  5 (run-with-store _ _ #:guile-for-build _ #:system _)
In guix/scripts/system.scm:
    637:2  4 (_ _)
In gnu/system.scm:
    884:4  3 (_ _)
In gnu/bootloader/grub.scm:
   343:29  2 (grub-configuration-file #<<bootloader-configuration> …> …)
   207:30  1 (eye-candy #<<bootloader-configuration> bootloader: #<…> …)
   149:22  0 (grub-background-image #<<bootloader-configuration> bo…> …)

gnu/bootloader/grub.scm:149:22: In procedure grub-background-image:
gnu/bootloader/grub.scm:149:22: In procedure struct_vtable: Wrong type argument 
in position 1 (expecting struct): 5

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Efraim Flashner   <address@hidden>   אפרים פלשנר
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lightweight-desktop.scm
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