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| ANSI Common Lisp 5 Data and Control Flow 5.3 Dictionary of Data and Control Flow
5.3.10 functionp | Function
  Syntax: functionp object generalized-boolean Arguments and Values: object - an object. generalized-boolean - a generalized boolean. Description: Returns true if object is of type function; otherwise, returns false. Examples:
       (functionp 'append)  false
       (functionp #'append)  true
       (functionp (symbol-function 'append))  true
       (flet ((f () 1)) (functionp #'f))  true
       (functionp (compile nil '(lambda () 259)))  true
       (functionp nil)  false
       (functionp 12)  false
       (functionp '(lambda (x) (* x x)))  false
       (functionp #'(lambda (x) (* x x)))  true
  Notes:
       (functionp object) ==(typep object 'function)
Allegro CL Implementation Details: None.

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