This has been fixed in emacs25 of as at least 18.10 (and possibly 18.04,
but I didn't check to confirm).
** Changed in: emacs24 (Ubuntu)
Status: New => Fix Released
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Thanks for taking the time to report this bug. It looks like you've
managed to pin-point the issue here! Have you considered sending a patch
upstream?
I just had a quick peek at lp:emacs trunk and it seems they still use
mapcar currently. I don't fully understand what that function is trying
to do
