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john@jocasta:~$ guix package --install=hello
The following package will be installed:      
   hello-2.9    out     /nix/store/3r2n9zm3kxb28klpzgarjxj8x3y3y6wf-hello-2.9

The following derivation will be built:
   /nix/store/9bjvfizkjvvkjvrpgmjj40myw63rfsjn-profile.drv
building profile '/nix/store/q9rq33lg1z9663d0lrzbxbp86bns4yvw-profile' with 26 packages...
Backtrace:
In ice-9/boot-9.scm:
 157: 13 [catch #t #<catch-closure 8498bf0> ...]
In unknown file:
   ?: 12 [apply-smob/1 #<catch-closure 8498bf0>]
In ice-9/boot-9.scm:
  63: 11 [call-with-prompt prompt0 ...]
In ice-9/eval.scm:
 432: 10 [eval # #]
In ice-9/boot-9.scm:
2320: 9 [save-module-excursion #<procedure 84b0de0 at ice-9/boot-9.scm:3961:3 ()>]
3966: 8 [#<procedure 84b0de0 at ice-9/boot-9.scm:3961:3 ()>]
1645: 7 [%start-stack load-stack ...]
1650: 6 [#<procedure 84b3df8 ()>]
In unknown file:
   ?: 5 [primitive-load "/nix/store/0pwlxicwd39q1ai1yhdfsd1kbyp3mhlj-profile-guile-builder"]
In ice-9/eval.scm:
 387: 4 [eval # ()]
 432: 3 [eval # #]
In /nix/store/2gdjbl23rk998yg9v2srjrixib9vpik8-module-import/guix/build/union.scm:
 205: 2 [union-build "/nix/store/q9rq33lg1z9663d0lrzbxbp86bns4yvw-profile" # # ...]
In srfi/srfi-1.scm:
 646: 1 [append-map #<procedure 865ad38 at ice-9/boot-9.scm:1042:8 args> #]
 576: 0 [map #<procedure 865ad38 at ice-9/boot-9.scm:1042:8 args> #]

srfi/srfi-1.scm:576:29: In procedure map:
srfi/srfi-1.scm:576:29: Throw to key `match-error' with args `("match" "no matching pattern")'.
builder for `/nix/store/9bjvfizkjvvkjvrpgmjj40myw63rfsjn-profile.drv' failed with exit code 1
guix package: error: build failed: build of `/nix/store/9bjvfizkjvvkjvrpgmjj40myw63rfsjn-profile.drv' failed
john@jocasta:~$