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(defparameter *handlers-1* nil) (defun reg-handler-1 (fun) (let ((real-fun (typecase fun (symbol (symbol-function fun)) (function fun) (t (error "Invalid type"))))) (push real-fun *handlers-1*))) (defun call-handlers-1 () (dolist (handler *handlers-1*) (funcall handler))) (defparameter *handlers-2* nil) (defun reg-handler-2 (fun) (unless (typep fun '(or function symbol)) (error "Invalid type")) (push fun *handlers-2*)) (defun call-handlers-2 () (dolist (handler *handlers-2*) (typecase handler (symbol (funcall (symbol-function handler))) (function (funcall handler))))) (defun foo () (format t "def 1!~%")) (reg-handler-1 #'foo) (reg-handler-1 'foo) (reg-handler-2 #'foo) (reg-handler-2 'foo) (call-handlers-1) (call-handlers-2) ;; eval interactively! ;; (defun foo () ;; (format t "def 2!~%")) ;; (call-handlers-1) ;; (call-handlers-2)