Subject: bug#42919: 27.1; Strange byte compile error with `cond' involving cons

From: Mattias Engdegård <[email-masked]>
Date: Wed, 19 Aug 2020 15:29:29 +0200

I'm so sorry about this stupid error, and am very grateful that you found it.
Would you try this patch (applicable to Emacs 27.1)?