guix environment -E DISPLAY --expose=/tmp/.X11-unix \
--ad-hoc -C emacs emacs-geiser emacs-guix guile \
Things like M-x run-guile (from Geiser) or M-x guix are not accessible
by default. I have to explicitly (require 'geiser) etc. to get them.
It seems to me that it used to be the case that Emacs packages were
readily usable in fresh environments, no? Did something change