I reconfigured my Guix system on commit 0d455d9	(Nov 22), and since then I can't
login into EXWM from GDM.  I get

--8<---------------cut here---------------start------------->8---
split-string: wrong type argument: stringp nil
--8<---------------cut here---------------end--------------->8---

if I recall correctly.

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