When running (bash syntax) "env GUILE_LOAD_PATH=/tmp:$GUILE_LOAD_PATH
guix repl <(echo '(display %load-path) (newline)')" /tmp is placed after
guix-module-union and guile modules.
While this may be desired behavior (judging from commit message of
459f0d07a1b), it leads to the user being unable to overwrite modules in
guix-module-union using environmental variables.
This doesn't really break anything documented, but it makes pre-inst-env
with unbuilt scripts/guix pull modules from guix-modules-union instead
of working directory. (i.e. "make check-system" will ignore changes to
gnu/tests subdirectory). Also I think it's logical for user paths to
take priority over system ones.
I think these entries are added by
https://git.savannah.gnu.org/cgit/guix.git/tree/guix/self.scm?id=2a242e86379ebddbdddf2927f26e5e27a98fc605#n616.
