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profiles: emacs-subdirs: Avoid building circular lists.

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This is a follow-up to e9b1329470.  If
the EMACSNATIVELOADPATH environment variable (by mistake) has duplicated
paths, Emacs fails to start up with a message along the lines of

  List contains a loop:
  ("$HOME/.guix-profile/lib/emacs/native-site-lisp" […] . #2)

To prevent this issue in the face of possibly duplicated search path elements,
use non-destructive methods where possible.

* guix/profiles.scm (emacs-subdirs): Use 'append' rather than 'nconc'.

Change-Id: If646b806f24666b5247850d30d2819c7482c130b
Fixes: Emacs "List contains a loop" <https://issues.guix.gnu.org/75709>
Signed-off-by: Liliana Marie Prikler <liliana.prikler@gmail.com>
This commit is contained in:
Thiago Jung Bauermann 2025-01-25 01:14:08 -03:00 • committed by Liliana Marie Prikler
parent 97fb1887ad
commit f9b1e548c9
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guix/profiles.scm
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@ -1230,8 +1230,12 @@ MANIFEST. Single-file bundles are required by programs such as Git and Lynx."
(setq native-comp-eln-load-path
(mapcan (lambda (dir)
(if (equal dir needle)
(nconc ',native-comp-dirs
(list dir))
;; Note: needle may be found
;; multiple times, so don't use
;; destructive procedures like
;; nconc.
(append ',native-comp-dirs
(list dir))
(list dir)))
native-comp-eln-load-path))))
port)