bnf - "Non-exhaustive patterns in case" error while parsing the BNFC file -


i getting

bnfc: src/lexbnf.x:(80,13)-(86,20): non-exhaustive patterns in case

error. mean?

it doesn't what's wrong bnf grammar, , have no idea how find error. tried looking for past few days, unsuccessfully.

i checked if every symbol defined somewhere in file, fixed rules, nothing helped.

i used have 2.6, , had same problem. however, on tool's webpage, says improvements error messages have been made since earlier versions, installed latest version (2.8), , gave me more informative error message. i'd recommend same.


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