Lots of comments praising LLM's understanding of Common Lisp macros. I've seen them break badly at the macros-writing-macros level. I saw a current frontier model get so disoriented by one (a simple one!), it created something that expanded into a "(let (((".
(That's an impossible count (3) of parentheses on the RHS—like a six-fingered hand).
(That's an impossible count (3) of parentheses on the RHS—like a six-fingered hand).