With guix 20161208.12 I see the following, which would probably take me a while to debug as I don't know my way around. (With the 0.11.0 version I got a different error without a backtrace. I upgraded after seeing a bug fix for hackage in the tracker.) $ guix import hackage -t darcs Backtrace: In ice-9/boot-9.scm: 160: 16 [catch #t # ...] In unknown file: ?: 15 [apply-smob/1 #] In ice-9/boot-9.scm: 66: 14 [call-with-prompt prompt0 ...] In ice-9/eval.scm: 432: 13 [eval # #] In ice-9/boot-9.scm: 2404: 12 [save-module-excursion #] 4056: 11 [#] 1727: 10 [%start-stack load-stack ...] 1732: 9 [#] In unknown file: ?: 8 [primitive-load "/gnu/store/hckw4cw3m6r55afrldhn9gf66wrznh7i-guix-0.11.0-8.8d12/bin/.guix-real"] In guix/ui.scm: 1222: 7 [run-guix-command import "hackage" "-t" "darcs"] In guix/scripts/import.scm: 110: 6 [guix-import "hackage" "-t" "darcs"] In guix/scripts/import/hackage.scm: 110: 5 [guix-import-hackage "-t" "darcs"] In guix/import/hackage.scm: 247: 4 [hackage->guix-package "darcs" #:include-test-dependencies? ...] 113: 3 [hackage-fetch "darcs"] In guix/import/cabal.scm: 580: 2 [read-cabal # #f] In system/base/lalr.upstream.scm: 1956: 1 [___run] 1851: 0 [___push 1 6 ...] system/base/lalr.upstream.scm:1851:2: In procedure ___push: system/base/lalr.upstream.scm:1851:2: Wrong number of arguments to #