simple-condition-format-arguments condition format-arguments
format-control - a format control.
format-arguments - a list.
simple-condition-format-arguments returns a list of format arguments needed to process the condition's format control.
(setq foo (make-condition 'simple-condition :format-control "Hi ~S" :format-arguments '(ho))) #<SIMPLE-CONDITION 26223553> (apply #'format nil (simple-condition-format-control foo) (simple-condition-format-arguments foo)) "Hi HO"