I've reviewed and tested the patch:

- review: 5/5 stars :D
- test: pass!

I've tested the following:

--8<---------------cut here---------------start------------->8---
$ /home/ambrevar/projects/guix/pre-inst-env guix package -i emacs-2048-game emacs -p ~/temp/foo
$ cd ~/temp
$ env -i $(which bash) --login --noprofile --norc
bash-5.0$ /run/current-system/profile/bin/env DISPLAY=:1 emacs
--8<---------------cut here---------------end--------------->8---

Content of *Messages*:

--8<---------------cut here---------------start------------->8---
Loading /gnu/store/ghdkfqnvrxipp4ikakags5rl7flywb72-profile/share/emacs/site-lisp/guix.d/2048-game-20151026.1233/2048-game-autoloads.el (source)...done
For information about GNU Emacs and the GNU system, type C-h C-a.
--8<---------------cut here---------------end--------------->8---

And 

--8<---------------cut here---------------start------------->8---
M-x 2048-game RET
--8<---------------cut here---------------end--------------->8---

works!

Can we merge this on master?  We have some 700 emacs packages that are
going to be rebuilt, but it's rather light for the build farm.  What do
you think?

-- 
Pierre Neidhardt
https://ambrevar.xyz/