This seems to be a successfully generated parser, whereas my situation is that I haven’t gotten that far yet.   I know that I’ve got errors in my grammar, and I am faced with an absence of sensible messages that would point me to the way to find them.

“Grammar debugging,” in any parser, is always an exercise that you are anxious to forget, once “you’ve finally got the damm thing working.”  :-D   But does anyone out there who’s done it fairly recently, have any suggestions or war-stories?