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Plists and NIL.

1) NIL is a symbol.  Like all symbols, it has a plist (see CLtL p.4 for an 


2) NIL is a list.

Therefore, does (SETQ z NIL)

                (SETF (GETF z :a) :b)


return NIL or (:a :b)? (That is, does the property go on NIL's plist or

directly into the list referenced by z?)

Golden Common LISP (ver. 2.2LM) resolves this by having no plist on NIL.  I 

consider this a bug, however.

David Loewenstern