bug#50739: Wrong type argument in position 158 (expecting empty list): #<package...

bug#50739: Wrong type argument in position 158 (expecting empty list): #<package...

[Brendan Tildesley]

I have a Guix with a 100+ packages updated, and a ran a guix build command with a long list of packages, getting this backtrace just after building a package. Note that it took hours of sucessfully building packages to get to this one error, and I'm not sure it will reproduce.
The error appears to be in processing the long list of packages.

The branch: https://notabug.org/Brendan/guix/src/wip-kde-updates-21.08

Backtrace:

...
validating RUNPATH of 0 binaries in "/gnu/store/lhypns0s7y9vcrxsk2zvqfg6kj2iarm7-ytfzf-1.2.0/bin"...
phase `validate-runpath' succeeded after 0.0 seconds
starting phase `validate-documentation-location'
phase `validate-documentation-location' succeeded after 0.0 seconds
starting phase `delete-info-dir-file'
phase `delete-info-dir-file' succeeded after 0.0 seconds
starting phase `patch-dot-desktop-files'
phase `patch-dot-desktop-files' succeeded after 0.0 seconds
starting phase `install-license-files'
installing 1 license files from '.'
phase `install-license-files' succeeded after 0.0 seconds
starting phase `reset-gzip-timestamps'
phase `reset-gzip-timestamps' succeeded after 0.0 seconds
starting phase `compress-documentation'
phase `compress-documentation' succeeded after 0.0 seconds
successfully built /gnu/store/382mwvir2hq5rvlk4k2d4a3sawl9vbzh-ytfzf-1.2.0.drv
Backtrace:
In ice-9/eval.scm:
    619:8 19 (_ #(#(#<directory (guile-user) 7f3a9349fc80>)))
In guix/ui.scm:
   2185:7 18 (run-guix . _)
  2148:10 17 (run-guix-command _ . _)
In ice-9/boot-9.scm:
  1752:10 16 (with-exception-handler _ _ #:unwind? _ # _)
In guix/status.scm:
    800:4 15 (call-with-status-report _ _)
In ice-9/boot-9.scm:
  1752:10 14 (with-exception-handler _ _ #:unwind? _ # _)
In guix/store.scm:
   658:37 13 (thunk)
   1320:8 12 (call-with-build-handler _ _)
   1320:8 11 (call-with-build-handler #<procedure 7f3a90176a50 at g…> …)
In guix/ui.scm:
    464:3 10 (_)
In ice-9/boot-9.scm:
  1747:15  9 (with-exception-handler #<procedure 7f3a81018d80 at ic…> …)
  1752:10  8 (with-exception-handler _ _ #:unwind? _ # _)
In guix/ui.scm:
    451:6  7 (_)
In guix/scripts/build.scm:
    608:5  6 (_)
In srfi/srfi-1.scm:
   673:15  5 (append-map _ _ . _)
   586:17  4 (map1 ("x86_64-linux"))
In unknown file:
           3 (concatenate ((#<derivation /gnu/store/z1x25h4kh8qv…>) …))
In ice-9/boot-9.scm:
  1685:16  2 (raise-exception _ #:continuable? _)
  1685:16  1 (raise-exception _ #:continuable? _)
  1685:16  0 (raise-exception _ #:continuable? _)

ice-9/boot-9.scm:1685:16: In procedure raise-exception:
In procedure append: Wrong type argument in position 158 (expecting empty list): #<package guvcview@2.0.6 gnu/packages/video.scm:5183 7f3a84448820>



Command: 
./pre-inst-env guix build sddm@0.19.0 fcitx-configtool@0.4.10 genimage@11 sameboy@0.14.4 mupen64plus-rsp-z64@2.0.0 mupen64plus-video-arachnoid@2.0.0 mednafen@1.27.1 mupen64plus-video-z64@2.0.0 emulation-station@2.0.1-1.9cc42ad nestopia-ue@1.48 bsnes@115 higan@110 mupen64plus-ui-console@2.5 blastem@0.6.2 ioquake3@1.3.6-1.95b9cab libtcod@1.15.1 mrrescue@1.02e dhewm3@1.5.1 supertuxkart@1.2 wesnoth-server@1.14.17 7kaa@2.15.4p1 xonotic@0.8.2 0ad@0.0.23b-alpha stepmania@5.1.0-b2 openclonk@8.1 openrct2@0.3.3 lugaru@1.2 endless-sky@0.9.14 vkquake@1.01.0 fizmo@0.8.5 astromenace@1.4.1 arx-libertatis@1.2 freeorion@0.4.10 yamagi-quake2@7.45 paperview@0.0.1-1.9f8538e megaglest@3.13.0 warzone2100@4.0.1 gzdoom@4.3.2 quakespasm@0.93.2 bzflag@2.4.22 mygui@3.2.2 mrg@0.1.4 jami-gnome@20210606.1.e2f9490 cl-sdl2@0.0.0-1.bb2aa2a ecl-sdl2@0.0.0-1.bb2aa2a zrythm@1.0.0-alpha.12.0.1 milkytracker@1.03.00 ocaml-tsdl@0.9.7 qtgamepad@5.15.2 aseba@1.6.0-0.3b35de8 neverball@1.6.0-1.760a25d dosbox-staging@0.76.0 lure-de@1.1 sky@1.2 queen-it@1.0 queen-de@1.0 queen-fr@1.0 lure-it@1.1 drascula@1.0 lure@1.1 lure-es@1.1 lure-fr@1.1 queen@1.1 jumpnbump@1.61 ufoai@2.6.0_dev-0.a542a87 easyrpg-player@0.6.2.3 taisei@1.3.2 julius@1.6.0 frotz-sdl@2.45pre chocolate-doom@3.0.1 crispy-doom@5.8.0 odamex@0.9.3 augustus@2.0.1 tesseract-engine@20200615-2411 python-pygame-sdl2@2.1.0-for-renpy-7.4.8 python-pyxel@1.4.3 meandmyshadow@0.5a widelands@1.0 pioneer@20210203 trigger-rally@0.6.6.1 colobot@0.2.0-alpha blobwars@2.00 tome4@1.7.4 abbaye@2.0.1 flare-game@1.12 wesnoth@1.14.17 solarus-quest-editor@1.6.5 red-eclipse@2.0.0 edgar@1.34 freedink@109.6 python-kivy@1.10.1 python2-kivy@1.10.1 gource@0.51 instead@3.3.5 cdogs-sdl@0.8.0 cataclysm-dda@0.F-2 supertux@0.6.2 teeworlds@0.7.5 unknown-horizons@2019.1 crawl-tiles@0.27.0 starfighter@2.4 raincat@1.2.1 sdl2-cs@B1-1.1a35564 guile-sdl2@0.6.0 guile-chickadee@0.7.0 tsukundere@0.3.2 ccextractor@0.88 tadbit@1.0.1 saga@7.9.0 nomacs@3.16.224 libfreenect-opencv@0.6.2 moc@2.5.2 libvideogfx@1.0.9 theorafile@0.0.0-1.404b14d lightspark@0.8.5 stackistry@0.3.0 bs1770gain@0.7.0 audacity@2.4.2 ardour@6.8 denemo@2.5.0 lmms@1.2.2 r-gganimate@1.0.7 reprotest@0.7.16 emacs-telega-contrib@0.7.025 retroarch@1.9.4 mgba@0.9.2 dolphin-emu@5.0-13178.a34823d pcsxr@1.9.95 ppsspp@1.11.3-1.69fa207 renpy@7.4.8 warsow-qfusion@2.5-1.c4de15d oshu@2.0.1 corsix-th@0.65 hedgewars@1.0.0 gnome-music@3.34.5 gnome-tweaks@3.34.1 gnome-photos@3.34.2 gnunet-gtk@0.13.1 guile-gnunet@0.0-1.d12167a icedove-wayland@78.13.0 geierlein@0.9.13 monado@21.0.0 flightgear@2018.3.5 blender@2.92.0 blender@2.79b openscenegraph@3.6.5 directfb@1.7.7 openmw@0.46.0 cozy@1.0.3 rapid-photo-downloader@0.9.18 cawbird@1.4.1 gaupol@1.9 pitivi@0.999.0-2021.01.0 julia-ffmpeg@0.4.1 kodi@18.8 kodi-wayland@18.8 mswebrtc@1.1.1-0.946ca70 msamr@1.1.3-0.5ab5c09 mssilk@1.1.1-0.dd0f31e linphone-desktop@4.2.5 msopenh264@1.2.1-0.88697cc numix-gtk-theme@2.6.7 gnome-shell-extension-gsconnect@33 arc-theme@20201013 gnome@3.34.5 ungoogled-chromium-wayland@92.0.4515.159-0.8164c91 xdg-desktop-portal-wlr@0.4.0 xdg-desktop-portal-gtk@1.7.1 ecl-fof@0.2.0 cl-fof@0.2.0 qtox@1.17.3 beets-bandcamp@0.1.4 strawberry@0.9.3 picard@2.4.4 clementine@1.4.0rc1-450-g2725ef99d cantata@2.4.2 mpd@0.22.10 audacious@4.1 pianobar@2020.11.28 cmus@2.9.1 demlo@3.8-0.fe9ec4c python-pydub@0.24.1 emacs-ob-sclang@20210519 zeal@0.6.1-1.d3c5521 qmapshack@1.15.2 jami-qt@20210606.1.e2f9490 movim-desktop@0.14.0-3.83d583b emacs-calibredb@2.10.0 orange@3.28.0 ghostwriter@2.0.2 openconnect-sso@0.7.3 qutebrowser@2.3.1 kiwix-desktop@2.0.5 sdrangel@6.16.1 weston@9.0.0 vinagre@3.22.0 readymedia@1.3.0 handbrake@1.3.3 motion@4.3.2 aegisub@3.2.2 emacs-youtube-dl@1.0-2.af877b5 emacs-ytdl@1.3.6 gpodder@3.10.21 instantmusic@1.0-1.300891d kodi-cli@1.1-1.104dc23 youtube-dl-gui@0.4 youtube-viewer@3.8.1 you-get@0.4.1500 guvcview@2.0.6 mplayer@1.4 vapoursynth@53 synfigstudio@1.2.2 obs-wlrobs@1.0 obs-websocket@4.9.0 obs-spectralizer@1.3.3 spacefm@1.0.6 wlstream@0.0-1.182076a openshot@2.5.1 shotcut@21.06.29 wf-recorder@0.2.1 simplescreenrecorder@0.4.2 pipe-viewer@0.1.4 arcan-wayland@0.5.5.2-1.b4dd1fb xarcan@0.5.4-1.8e6ee02 arcan-sdl@0.5.5.2-1.b4dd1fb gnome-arcade@0.218.2 transcode@1.1.7 anki@2.1.16 ytfzf@1.2.0 curseradio@0-1.1bd4bd0 gfeeds@0.16.2 mpv-mpris@0.5 celluloid@0.21 dvdstyler@3.0.4 opencpn@5.0.0 xpra@4.2.1 retux@1.5 bambam@1.0.0 seahorse-adventures@1.3 roguebox-adventures@3.0.1 childsplay@3.4 omnitux@1.2.1 slingshot@0.9 impressive@0.12.1 frozen-bubble@2.2.1-1.d6a0291 virt-manager@3.2.0 looking-glass-client@a12-182c475 remmina@1.4.20 lagrange@1.5.2 wine64@6.16 fcitx5-gtk@5.0.7 fcitx5-chinese-addons@5.0.6 modemmanager-qt@5.86.0 bluez-qt@5.86.0 owncloud-client@2.7.6.3261 quiterss@0.19.4 kimageformats@5.86.0 drawpile@2.1.17-1.ed1a75deb telegram-desktop@2.5.9 fcitx5-configtool@5.0.5 screengrab@2.2.0 lxqt-connman-applet@0.15.0-0.db1618d gcompris-qt@1.1 poxml@21.08.1 kajongg@21.08.1 kdesu@5.86.0 ksshaskpass@5.22.5 kxstitch@2.2.0 ffmpegthumbs@21.08.1 zeroconf-ioslave@21.08.1 kcachegrind@20.04.1 kio-extras@21.08.1 krdc@21.08.1 juk@21.08.1 dragon@21.08.1 kwave@21.08.1 kaffeine@2.0.18 krfb@21.08.1 ksystemlog@21.08.1 kmouth@21.08.1 kmag@21.08.1 rsibreak@0.12.14 sweeper@21.08.1 krusader@2.7.2 kmousetool@21.08.1 kronometer@2.2.3 kdf@21.08.1 krita@4.4.8 kblog@20.04.1 kmix@21.08.1 kate@21.08.1 smb4k@3.1.0 kamoso@21.08.1 ark@21.08.1 kjsembed@5.86.0 khelpcenter@21.08.1 nextcloud-client@3.1.3 elisa@21.08.1 kmplayer@0.12.0b k3b@21.08.1 audiocd-kio@21.08.1 kleopatra@21.08.1 kdenlive@20.08.3 kscreenlocker@5.22.5 lxqt@17.0 kgpg@21.08.1 kaddressbook@21.08.1 knotes@21.08.1 korganizer@21.08.1 massif-visualizer@0.7.0 kdevelop@5.6.2 qgis@3.16.3 kopete@21.08.1 konversation@21.08.1 ktorrent@21.08.1 kget@21.08.1 kdepim-runtime@21.08.1 okteta@0.26.6 kpmcore@21.08.1 kdeconnect@21.08.1 psi@1.5 psi-plus@1.5.1484 choqok@1.7.0 quassel@0.13.1 ktouch@21.08.1 kiriki@21.08.1 bomber@21.08.1 konquest@21.08.1 ksnakeduel@21.08.1 ksudoku@21.08.1 kigo@21.08.1 ksquares@21.08.1 kbreakout@21.08.1 kubrick@21.08.1 kblocks@21.08.1 kblackbox@21.08.1 kjumpingcube@21.08.1 kbounce@21.08.1 kshisen@21.08.1 picmi@21.08.1 killbots@21.08.1 palapeli@21.08.1 kollision@21.08.1 kmines@21.08.1 kdiamond@21.08.1 kolf@21.08.1 ksirk@21.08.1 knavalbattle@21.08.1 kgoldrunner@21.08.1 kfourinline@21.08.1 kmahjongg@21.08.1 lskat@21.08.1 granatier@21.08.1 kreversi@21.08.1 kapman@21.08.1 klines@21.08.1 ktuberling@21.08.1 knetwalk@21.08.1 kspaceduel@21.08.1 bovo@21.08.1 okular@21.08.1 kmail@21.08.1 labplot@2.8.2 akregator@21.08.1 dolphin-plugins@21.08.1 yakuake@21.08.1