make-condition type &rest slot-initializations → condition

type — a type specifier (for a subtype of condition).

slot-initializations — an initialization argument list.

condition — a condition.

Constructs and returns a condition of type type using slot-initializations for the initial values of the slots. The newly created condition is returned.

 (defvar *oops-count* 0) 

 (setq a (make-condition 'simple-error 
                         :format-control "This is your ~:R error." 
                         :format-arguments (list (incf *oops-count*)))) 
→ #<SIMPLE-ERROR 32245104> 

 (format t "~&~A~%" a) 
⊳ This is your first error. 
→ NIL 

 (error a) 
⊳ Error: This is your first error. 
⊳ To continue, type :CONTINUE followed by an option number: 
⊳  1: Return to Lisp Toplevel. 
⊳ Debug>

The set of defined condition types.

define-condition, Section 9.1 (Condition System Concepts)