Rational Developer for System z
Enterprise PL/I for z/OS, Version 3.8, Language Reference Manual

On-units

ON statement
Null ON-unit
Scope of the ON-unit
Dynamically descendent ON-units
ON-units for file variables

An implicit action exists for every condition. When an enabled condition is raised, the implicit action is executed unless an ON-unit for the enabled condition is established. If the implicit action is to raise ERROR and no ON-unit has been established for the condition, a message will be written before the ERROR condition is raised.


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