Just a heads-up to say that this still applies to 26.3. The affected files are:
--8<---------------cut here---------------start------------->8--- $ diff -r --no-dereference /tmp/emacs.{1,2} Binary files /tmp/emacs.1/bin/.emacs-26.3-real and /tmp/emacs.2/bin/.emacs-26.3-real differ Binary files /tmp/emacs.1/share/emacs/26.3/lisp/calendar/cal-iso.elc and /tmp/emacs.2/share/emacs/26.3/lisp/calendar/cal-iso.elc differ Binary files /tmp/emacs.1/share/emacs/26.3/lisp/cedet/semantic/lex-spp.elc and /tmp/emacs.2/share/emacs/26.3/lisp/cedet/semantic/lex-spp.elc differ Binary files /tmp/emacs.1/share/emacs/26.3/lisp/cedet/semantic/tag-ls.elc and /tmp/emacs.2/share/emacs/26.3/lisp/cedet/semantic/tag-ls.elc differ Binary files /tmp/emacs.1/share/emacs/26.3/lisp/cedet/semantic/tag-write.elc and /tmp/emacs.2/share/emacs/26.3/lisp/cedet/semantic/tag-write.elc differ Binary files /tmp/emacs.1/share/emacs/26.3/lisp/emacs-lisp/easy-mmode.elc and /tmp/emacs.2/share/emacs/26.3/lisp/emacs-lisp/easy-mmode.elc differ Binary files /tmp/emacs.1/share/emacs/26.3/lisp/eshell/esh-proc.elc and /tmp/emacs.2/share/emacs/26.3/lisp/eshell/esh-proc.elc differ Binary files /tmp/emacs.1/share/emacs/26.3/lisp/progmodes/ada-xref.elc and /tmp/emacs.2/share/emacs/26.3/lisp/progmodes/ada-xref.elc differ Binary files /tmp/emacs.1/share/emacs/26.3/lisp/progmodes/ebnf-bnf.elc and /tmp/emacs.2/share/emacs/26.3/lisp/progmodes/ebnf-bnf.elc differ Binary files /tmp/emacs.1/share/emacs/26.3/lisp/vc/ediff-mult.elc and /tmp/emacs.2/share/emacs/26.3/lisp/vc/ediff-mult.elc differ $ guix describe Generation 117 Nov 27 2019 16:43:08 (current) guix f678cc9 repository URL: https://git.savannah.gnu.org/git/guix.git branch: master commit: f678cc9c793bcf23ced842f815c5d98bbde5fa31 --8<---------------cut here---------------end--------------->8--- Ludo’.