bug#40375: 27.0.50; yank unexpectedly depends on progn

[Eli Zaretskii]

> From: Markus Triska <triska@metalevel.at>
> Cc: schwab@linux-m68k.org,  40375@debbugs.gnu.org,  npostavs@gmail.com
> Date: Mon, 13 Apr 2020 20:52:48 +0200
> 
> Alternatively, is there a way to get `yank' to do what this states,
> i.e., to always insert the most recently killed or yanked text,
> disregarding the clipboard contents of the operating platform?

Yes, set interprogram-paste-function to nil.