Just guessing: If you see that the writer form is a funcall to a setf function, you can then check with fboundp if such a function actually exists. This is probably a bit shaky, but maybe good enough for practical purposes? Pascal On 8 Oct 2012, at 16:56, Didier Verna <didier@lrde.epita.fr> wrote:
Raymond Wiker <rwiker@gmail.com> wrote:
#'get-setf-expansion, perhaps?
Nope, because it gives you something by default.
CL-USER> (get-setf-expansion '(not-previously-defined)) NIL NIL (#:NEW886) (FUNCALL #'(SETF NOT-PREVIOUSLY-DEFINED) #:NEW886) (NOT-PREVIOUSLY-DEFINED)
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Scientific site: http://www.lrde.epita.fr/~didier Music (Jazz) site: http://www.didierverna.com
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