Default value: nil

The value should be one of:


Eliminate all conditions.


Keep only the conditions that are in the class-precedence-list of simple-error . ( simple-error , simple-condition error, and serious-condition condition). This is useful for applications that use only ignore-errors . It is equivalent to

:keep-conditions '(simple-error) :packages-to-remove-conditions '("common-lisp")


Keep all conditions.

A list

A list of conditions to keep. For each condition, all the precedence list is kept.

See Deleting of condition classes.

LispWorks Delivery User Guide - 12 Sep 2005