Topic: default exception handler

Summary

All systems provide a default exception handler for run-time errors and exceptions. A common handler is to display an error message and return to the command interpreter. If users want control over errors, they define exception handlers. The user wants to trap certain errors, leaving other exceptions to the default handler. So the default exception handler may be invoked from within a user-defined handler. (cbb 5/80)

Subtopic: default handler

QuoteRef: goodJB12_1975 ;;693 default handler may be explicitly attached to any SIGNAL or NOTIFY statement

QuoteRef: goodJB12_1975 ;;693 RESUME (DEFAULT) in user defined handler for default condition, causes escape to default handler

Subtopic: stack trace

Quote: an unhandled exception raises a 'failure' exception that is either handled or generates trace-back information [»hullTE9_1988]

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