This thread might be pertinent to your question: [link:cs.hubfs.net]
You might also be interested in FParsec, which was designed to generate informative error messages for syntax errors.
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Hello,
I am developing a parser for a non trivial language, and I have come to a place where I would really like to see which productions are used. Is there a way of doing this without too much trouble?
Also, there must be some way of improving the error message incurred when a syntax error happens: It would be nice to know the symbol just read, the parser state and the set of expected symbols in that particular state etc.
If these two problems are not solvable, I would have to question the applicability of the whole parser framework for developing production parsers.
BR pvillads