Class Precedence List:
simple-condition, condition, t
The type simple-condition represents conditions that are signaled by signal whenever a format-control is supplied as the function's first argument. The format control and format arguments are initialized with the initialization arguments named :format-control and :format-arguments to make-condition, and are accessed by the functions simple-condition-format-control and simple-condition-format-arguments. If format arguments are not supplied to make-condition, nil is used as a default.