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warning

warning Condition Type

Class Precedence List:

warning, condition, t

Description:

The type warning consists of all types of warnings.

See Also:

style-warning

Expanded Reference: warning​

The warning Condition Type​

warning is the base type for all warning conditions. Warnings are conditions that are worth noting but do not require the program to stop. When signaled via warn and not handled, they are printed to *error-output*.

(subtypep 'warning 'condition)

=> T
=> T

Warning Is Not a Serious Condition​

Warnings are not subtypes of serious-condition or error.

(subtypep 'warning 'serious-condition)
=> NIL
=> T

Handling All Warnings​

(handler-bind ((warning (lambda (c)
                          (declare (ignore c))
                          (muffle-warning))))
  (warn "First")
  (warn "Second")
  :done)

=> :DONE

Standard Warning Subtypes​

(subtypep 'simple-warning 'warning)

=> T
=> T
(subtypep 'style-warning 'warning)

=> T
=> T