Subject: bug#76472: nconc should fail for dotted lists

From: Mattias Engdegård <[email-masked]>
Date: Fri, 21 Feb 2025 18:25:21 +0100

> The current behavior is: (nconc '(1 . 2) '(3 4)) => (1 3 4) 

Actually that is probably intended and completely fine. It's what Common Lisp defines for this operation, and I don't think adding a nil check would be an improvement.