bug#69282: 30.0.50; warning for obsolete macro in version 30.0.50

[Eli Zaretskii]

> Date: Tue, 20 Feb 2024 02:10:11 +0100
> From: Niels Søndergaard <niels@algon.dk>
> 
> Starting emacs from a newbuild version from sources 30.0.50 gives this 
> warning: 
> 
> Warning (bytecomp): ‘pcase--flip’ is an obsolete macro (as of 30.1); use ‘_’ 
> instead. [2 times]
> 
> The pcase—flip is found in “emacs-lisp/pcase.el” and “emacs-lisp/map.el” .
> 
> This is not fatal, but annoying.

I cannot reproduce this with the current master branch.  Could you
please post a recipe for reproducing the problem, starting from
"emacs -Q"?