Excellent example of a place where the file compiler can differ from the REPL, and as you point out this is perfectly legal. It's why #'eq is often not the best

Excellent example of a place where the file compiler can differ from the REPL, and as you point out this is perfectly legal. It's why #'eq is often not the best equality predicate unless you know what you're doing. CCL and Lispworks return NIL for this test in both cases.