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| ANSI Common Lisp 9 Conditions 9.1 Condition System Concepts ### 9.1.1 Condition Types The next figure lists the standardized condition types. Additional condition types can be defined by using define-condition.
arithmetic-error | floating-point-overflow | simple-type-error
cell-error | floating-point-underflow | simple-warning
condition | package-error | storage-condition
control-error | parse-error | stream-error
division-by-zero | print-not-readable | style-warning
end-of-file | program-error | type-error
error | reader-error | unbound-slot
file-error | serious-condition | unbound-variable
floating-point-inexact | simple-condition | undefined-function
floating-point-invalid-operation | simple-error | warning
Standardized Condition Types
All condition types are subtypes of type condition. That is,
     (typep c 'condition)  true
if and only if c is a condition. Implementations must define all specified subtype relationships. Except where noted, all subtype relationships indicated in this document are not mutually exclusive. A condition inherits the structure of its supertypes. The metaclass of the class condition is not specified. Names of condition types may be used to specify supertype relationships in define-condition, but the consequences are not specified if an attempt is made to use a condition type as a superclass in a defclass form. The next figure shows operators that define condition types and creating conditions.
define-condition | make-condition
Operators that define and create conditions.
The next figure shows operators that read the value of condition slots.
arithmetic-error-operands | simple-condition-format-arguments
arithmetic-error-operation | simple-condition-format-control
cell-error-name | stream-error-stream
file-error-pathname | type-error-datum
package-error-package | type-error-expected-type
print-not-readable-object | unbound-slot-instance
Operators that read condition slots.
9.1.1.1 Serious Conditions

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- File last updated 2022-07-25