Just for the record ...

[KMP at MIT-MC (Kent M. Pitman)]

(DEFUN&) => NIL
(PLIST 'NIL) => (EXPR (LAMBDA NIL (COMMENT ARGLIST = NIL)))
(NIL)
;NIL UNDEFINED FUNCTION OBJECT


Yes, I realize this is hard to get NIL to do correctly -- presumably 
EVAL is looking at NIL's other CDR ... Mostly just noting this oddity for
the record. 

(DEFUN NIL NIL NIL) 

gives the same bug. Perhaps these guys should complain about bad format to
DEFUN or something, for the case where some macro (eg, DEFUN&) produces them
without realizing it ...

-kmp