Null ON-unit
The
effect of a null statement ON-unit is to execute normal return from
the condition.
Use of the null ON-unit is different from disabling a condition
for two reasons:
- A null ON-unit can be specified for any condition, but not all
conditions can be disabled.
- Disabling a condition, if possible, can save time by avoiding
any checking for this condition. (If a null ON-unit is specified,
the PL/I must still check for the raising of the condition.)
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