Re: [PATCH 4/4] environment: Add '--debug' flag.

[David Craven <david@craven.ch>]

Maybe I'm doing something wrong then, this is what I get:
I was symlinking individual files into .guix, now I'm symlinking
the whole $HOME/guix/gnu folder into .guix

guix package -i qemu -L $HOME/guix

guix package: warning: failed to load '(build-aux check-available-binaries)':
Backtrace:
In ice-9/boot-9.scm:
1729: 19 [#<procedure 237aea0 ()>]
In unknown file:
   ?: 18 [primitive-load
"/gnu/store/vw26xsn24jmrijn939fjjk50m5i4hfq3-guix-0.10.0-0.e901/bin/.guix-real"]
In guix/ui.scm:
1209: 17 [run-guix-command package "-i" "qemu" "-L" "/home/dvc/guix"]
In ice-9/boot-9.scm:
 157: 16 [catch srfi-34 #<procedure 32a70a0 at guix/ui.scm:425:2 ()> ...]
 157: 15 [catch system-error ...]
In guix/scripts/package.scm:
 857: 14 [#<procedure 32a70c0 at guix/scripts/package.scm:845:4 ()>]
 815: 13 [process-actions #<build-daemon 256.15 32a8200> (# # # # ...)]
 574: 12 [options->installable (# # # # ...) #<<manifest> entries: #>]
In srfi/srfi-1.scm:
 664: 11 [filter-map #<procedure 32a1220 at
guix/scripts/package.scm:574:16 (expr)> ...]
In guix/scripts/package.scm:
 583: 10 [#<procedure 32a1220 at guix/scripts/package.scm:574:16 (expr)> #]
In gnu/packages.scm:
 342: 9 [specification->package+output "qemu" "out"]
 297: 8 [%find-package "qemu" "qemu" #f #:fallback? #f]
 265: 7 [find-best-packages-by-name "qemu" #f]
In guix/combinators.scm:
  43: 6 [#<procedure 329cf90 at guix/combinators.scm:39:4 args>]
In gnu/packages.scm:
 214: 5 [fold-packages #<procedure 3291180 at gnu/packages.scm:247:20 (p r)> #]
In srfi/srfi-1.scm:
 481: 4 [fold-right #<procedure 3291620 at gnu/packages.scm:185:14
(spec result)> ...]
In gnu/packages.scm:
 188: 3 [#<procedure 3291620 at gnu/packages.scm:185:14 (spec result)>
"/home/dvc/guix" ...]
In srfi/srfi-1.scm:
 664: 2 [filter-map #<procedure 6b7e420 at gnu/packages.scm:168:14 (file)> #]
In gnu/packages.scm:
 176: 1 [#<procedure be9e240 at gnu/packages.scm:174:20 args> quit #f]
In unknown file:
   ?: 0 [display-error #f #<output: file /dev/pts/0> #f]

ERROR: In procedure display-error:
ERROR: Wrong number of arguments to #<procedure display-error (_ _ _ _ _ _)>