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| ANSI Common Lisp 9 Conditions 9.1 Condition System Concepts ### 9.1.3 Printing Conditions If the `:report` argument to define-condition is used, a print function is defined that is called whenever the defined condition is printed while the value of *print-escape* is false. This function is called the condition reporter; the text which it outputs is called a report message. When a condition is printed and *print-escape* is false, the condition reporter for the condition is invoked. Conditions are printed automatically by functions such as invoke-debugger, break, and warn. When *print-escape* is true, the object should print in an abbreviated fashion according to the style of the implementation (e.g., by print-unreadable-object). It is not required that a condition can be recreated by reading its printed representation. No function is provided for directly accessing or invoking condition reporters. 9.1.3.1 Recommended Style in Condition Reporting

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