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From: Philipp Stephani
Newsgroups: gmane.emacs.devel
Subject: Re: bug#47391: 27.2; static list return from function and nconc
Date: Thu, 25 Mar 2021 16:28:26 +0100
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Cc: 47391@debbugs.gnu.org, Emacs developers
To: Rajeev Narang
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Am Do., 25. M=C3=A4rz 2021 um 16:23 Uhr schrieb Rajeev Narang via Bug
reports for GNU Emacs, the Swiss army knife of text editors
:
>
> (defun fn () '(1 2))
>
> (nconc (fn) '(3))
> -> (1 2 3)
This is undefined behavior/unsupported. The value that (fn) evaluates
to is immutable, but nconc mutates it.
>
> (nconc (fn) '(3))
> -> (1 2 3 3) ? should be (1 2 3)
>
> If this is not a bug, then hfy-invisible, hfy-face-to-style-i may need to=
be fixed.
If they use this pattern, then they should indeed be fixed.