This is how I sometimes test patches sent to guix-patches mailing list using @cbaines's service:
guix time-machine --url='https://git.guix-patches.cbaines.net/git/guix-patches'--branch=issue-67260 --disable-authentication -- shell emacs-pgtk emacs-magit --pure -E '.*GTK.*|.*XDG.*|.*DISPLAY.*' -- emacs -Q
Hey, this look rather feasible! I'll give it a try.
The patch-branches provided by @cbaines are rather helpful anyway.
@abcdw