Provides a list of all potentially dead data items in the program.
A data item is regarded as dead if neither it, nor any of its related data items, are referenced in the Procedure Division.
This generally gives a very good indication of whether an item declared in the Data Division is actually required by the program
or not. Care should be taken with:
- Data items used by conditionally compiled code.
- Data items defined in special clauses and not referenced explicitly in the Procedure Division (for example, FILE STATUS IS
...) and Screen Section (TO, FROM).