Another common error is to declare a pointer (usually a pointer to an object) and then use it without the memory for the target data being allocated.
/* You don't want to do this */ DEF p:PTR TO object p.element:=99
There are two ways of correcting this: either dynamically allocate the memory using
NEW or, more simply, let an appropriate declaration allocate it.
See 14 Memory Allocation.
DEF p:PTR TO object NEW p p.element:=99 DEF p:object p.element:=99
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