Subject: Re: 28.0.50; when building emacs 28.0.50 ./temacs is stopped with core

From: Paul Eggert <[email-masked]>
Date: Thu, 3 Sep 2020 12:17:15 -0700

Thanks for isolating the commit that caused the problem. I can't easily debug it 
on macOS, so I reverted the commit and its dependents. This should fix your 
problem, whatever it is.