Introduce a function variable.
(defunvar fvar (* ... *) => * :print ...)
A symbol, which names the
function variable. It must be a valid function name that is not already in use.
A list of zero or more
* signs, which defines the arity offvar .
An option to customize the screen output:
:all to print all the output;nil (the default) to print only any error output.
(defstub fvar (* ... *) => *)
;; A unary function variable: (defunvar ?f (*) => *)
;; A unary function variable: (defunvar ?p (*) => *)
;; A binary function variable: (defunvar ?g (* *) => *)