Error Handling for when I omit 'proc' in a function call

In a function, I mistakenly had:

SET Streetname := GetWordN(StreetAddress, ' ', StreetNameFirstWordPosition);

The correct statement is:
SET Streetname := proc.GetWordN(StreetAddress, ' ', StreetNameFirstWordPosition);

Can someone please post the code I need to add to my function so that I will get a meaningful error message for the original statement instead of just "OK" in Workbench?  It took me an hour to track that omission down!
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