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Showing content from http://www.lispworks.com/documentation/HyperSpec/Body/09_ac.htm below:

CLHS: Section 9.1.3

CLHS: Section 9.1.3 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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