Thanks. I can't find optionMaybe in my version 2.1 of Parsec, but in any case,
defining my only_prod as
only_prod = do { reserved "only"; option [] identifier }
or
only_prod = do { reserved "only"; identifier <|> return [] }
gives the same error responses as before. I will anyway look closer at option.
You're right that I don't understand try, but it's not for lack of trying. My
examples' use of try though was just a stab at a readable failure. Maybe I
should refactor my example.
Paul
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