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simple-warning

simple-warning Condition Type

Class Precedence List:

simple-warning, simple-condition, warning, condition, t

Description:

The type simple-warning represents conditions that are signaled by warn whenever a format control is supplied as the function’s first argument.

Expanded Reference: simple-warning​

The simple-warning Type​

simple-warning is the default condition type signaled by warn when a format string is passed. It inherits from both simple-condition and warning.

(subtypep 'simple-warning 'warning)

=> T
=> T
(subtypep 'simple-warning 'simple-condition)

=> T
=> T

Created Implicitly by warn​

(handler-bind ((simple-warning (lambda (c)
                                 (declare (ignore c))
                                 (muffle-warning))))
  (warn "Low disk space")
  :warned)

=> :WARNED

Accessing Format Information​

(handler-case
    (warn "~D files remaining" 3)
  (simple-warning (c)
    (simple-condition-format-arguments c)))

=> (3)