Capturing errors within ON-EXIT Simon Hutchinson

​Having been busy recently performing presentations to various user groups and conferences I noticed an oversight in my work. In my presentations I had given an example of using the ON-EXIT group showing how I can use an indicator to indicate if an error had occurred in the procedure or subprocedure. In my post, on this website, about ON-EXIT I only mentioned it in passing. In this post I want to overcome oversight to show how I can do this.
The ON-EXIT group can be added to the end of every procedure or subprocedure in a RPG program. Regardless of whether the procedure or subprocedures errors or not, the code within the ON-EXIT group is always executed.
Let me start with my first example program, this one does not have any procedures or subprocedures:
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