bug#47391: 27.2; static list return from function and nconc

[Philipp Stephani]

Am Do., 25. März 2021 um 16:23 Uhr schrieb Rajeev Narang via Bug
reports for GNU Emacs, the Swiss army knife of text editors
<bug-gnu-emacs@gnu.org>:
>
> (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.