As reported by mroh on #guix, building the current master branch crashes `guix pull`:
------ building /gnu/store/73f1lk43y71byz6zic4ac397s751d50c-guix-cli.drv... [ 8/110] loading... 14.5% of 55 filesBacktrace: In ice-9/boot-9.scm: 222:29 19 (map1 (((gnu packages less)) ((gnu packages linux)) ((gnu packages man)) ((gnu packages nano)) ((gnu packages nvi)) ((gnu packages package-management)) ((gnu packages pciutils)) (#) ?)) 222:29 18 (map1 (((gnu packages linux)) ((gnu packages man)) ((gnu packages nano)) ((gnu packages nvi)) ((gnu packages package-management)) ((gnu packages pciutils)) ((gnu packages texinfo)) # ?)) 222:29 17 (map1 (((gnu packages man)) ((gnu packages nano)) ((gnu packages nvi)) ((gnu packages package-management)) ((gnu packages pciutils)) ((gnu packages texinfo)) ((gnu packages zile)) # ?)) 222:29 16 (map1 (((gnu packages nano)) ((gnu packages nvi)) ((gnu packages package-management)) ((gnu packages pciutils)) ((gnu packages texinfo)) ((gnu packages zile)) ((gnu services)) ((?)) ?)) 222:29 15 (map1 (((gnu packages nvi)) ((gnu packages package-management)) ((gnu packages pciutils)) ((gnu packages texinfo)) ((gnu packages zile)) ((gnu services)) ((gnu services shepherd)) # ?)) 222:29 14 (map1 (((gnu packages package-management)) ((gnu packages pciutils)) ((gnu packages texinfo)) ((gnu packages zile)) ((gnu services)) ((gnu services shepherd)) ((gnu services base)) # ?)) 222:29 13 (map1 (((gnu packages pciutils)) ((gnu packages texinfo)) ((gnu packages zile)) ((gnu services)) ((gnu services shepherd)) ((gnu services base)) ((gnu bootloader)) ((gnu system #)) # ?)) 222:29 12 (map1 (((gnu packages texinfo)) ((gnu packages zile)) ((gnu services)) ((gnu services shepherd)) ((gnu services base)) ((gnu bootloader)) ((gnu system shadow)) ((gnu system nss)) (#) ?)) 222:29 11 (map1 (((gnu packages zile)) ((gnu services)) ((gnu services shepherd)) ((gnu services base)) ((gnu bootloader)) ((gnu system shadow)) ((gnu system nss)) ((gnu system locale)) ((?)) ?)) 222:29 10 (map1 (((gnu services)) ((gnu services shepherd)) ((gnu services base)) ((gnu bootloader)) ((gnu system shadow)) ((gnu system nss)) ((gnu system locale)) ((gnu system pam)) ((gnu ?)) ?)) 222:17 9 (map1 (((gnu services shepherd)) ((gnu services base)) ((gnu bootloader)) ((gnu system shadow)) ((gnu system nss)) ((gnu system locale)) ((gnu system pam)) ((gnu system #)) ((gnu ?)) ?)) 3297:17 8 (resolve-interface (gnu services shepherd) #:select _ #:hide _ #:prefix _ #:renamer _ #:version _) In ice-9/threads.scm: 390:8 7 (_ _) In ice-9/boot-9.scm: 3223:13 6 (_) In ice-9/threads.scm: 390:8 5 (_ _) In ice-9/boot-9.scm: 3507:20 4 (_) 2806:4 3 (save-module-excursion #<procedure 7ffff2527d80 at ice-9/boot-9.scm:3508:21 ()>) 3527:26 2 (_) In unknown file: 1 (primitive-load-path "gnu/services/shepherd" #<procedure 7ffff1cc3500 at ice-9/boot-9.scm:3514:37 ()>) In gnu/services/shepherd.scm: 107:21 0 (_) gnu/services/shepherd.scm:107:21: In procedure allocate-struct: Wrong type argument in position 1 (expecting struct): #<procedure %service-extension?-procedure (obj)> note: keeping build directory `/tmp/guix-build-guix-cli.drv-0' builder for `/gnu/store/73f1lk43y71byz6zic4ac397s751d50c-guix-cli.drv' failed with exit code 1 build of /gnu/store/73f1lk43y71byz6zic4ac397s751d50c-guix-cli.drv failed View build log at '/var/log/guix/drvs/73/f1lk43y71byz6zic4ac397s751d50c-guix-cli.drv.bz2'. cannot build derivation `/gnu/store/bbhcka85bgbjxdi47myz5xf0nrb2qygl-guix-cli-modules.drv': 1 dependencies couldn't be built cannot build derivation `/gnu/store/z6fa0smqmsqnpzsdafncryza40h79yrj-guix-system-tests.drv': 1 dependencies couldn't be built cannot build derivation `/gnu/store/hnfp4fvbnyaw3flqsmsw896iwmy8yds1-guix-dfed0eca9-modules.drv': 1 dependencies couldn't be built cannot build derivation `/gnu/store/fgsx7x6dfs0l13i6ka4c70q0hpk2cv7f-guix-dfed0eca9.drv': 1 dependencies couldn't be built cannot build derivation `/gnu/store/m6ls1fg02fx235x3vkiss18k2ys3jkjw-profile.drv': 1 dependencies couldn't be built guix pull: error: build of `/gnu/store/m6ls1fg02fx235x3vkiss18k2ys3jkjw-profile.drv' failed ------ I've confirmed that commit b5f2a035f93519b27f46673e6d76665767a1fbd9 works, and I'm testing later commits now.