bug#42161: Confusing '' error message

[Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>]

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Hi,

When doing guix system system.scm /path/to/empty/directory, I have the
following error message:

> # guix system --verbosity=99 --debug=99 --no-bootloader  init
> system.scm /srv/distros/guix/ guile: warning: failed to install locale
> acquiring global GC lock `/var/guix/gc.lock'
> acquiring read lock on `/var/guix/temproots/14408'
> acquiring write lock on `/var/guix/temproots/14408'
[...]
> acquiring write lock on `/var/guix/temproots/14408'
> downgrading to read lock on `/var/guix/temproots/14408'
> Backtrace:
>            1 (primitive-load "/root/.config/guix/current/bin/guix")
> In guix/ui.scm:
>   1949:12  0 (run-guix-command _ . _)
> 
> guix/ui.scm:1949:12: In procedure run-guix-command:
> In procedure struct-vtable: Wrong type argument in position 1
> (expecting struct): #f

so I'm probably doing something wrong here as I'm probably not supposed
to abuse guix system init to create chroots for lxc.

However the issue is that there is no clear error message nor backtrace
telling me what exactly is wrong here. I don't even have a line in my
file that tells me what line is wrong.

I've attached the system.scm used for reference.

Denis.

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(use-modules (gnu))
(use-service-modules networking ssh)
(use-package-modules irc screen ssh tor)

(operating-system
 (host-name "test")
 (timezone "Europe/Paris")
 (locale "en_US.utf8")

 (bootloader (bootloader-configuration
	      (bootloader grub-bootloader)
	      (target "/dev/sdX")))
 (file-systems %base-file-systems)

 (users (cons (user-account
	       (name "irssi")
	       (group "users")
	       (home-directory "/home/irssi"))
	      %base-user-accounts))

 (packages (cons* irssi openssh screen tor %base-packages ))
 (services (cons* (service dhcp-client-service-type)
                  (service openssh-service-type
                           (openssh-configuration
			    (port-number 222)
			    (permit-root-login #t)
			    ; No passwords logins
			    (password-authentication? #f)
			    (challenge-response-authentication? #f)
			    (use-pam? #f)
			    )
			   )
;                 (service tor-service)
;                 (service tor-hidden-service ((222 "127.0.0.1:222")) )
		  %base-services)))

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