On Tue, 2008-03-25 at 11:47 -0400, Albert Y. C. Lai wrote: > Paul Keir wrote: > > I’m having some difficulty using the Parsec library, perhaps you could > > help. I’ve reduced my problem as shown below. I would like the > > ‘only_prod’ parser to require the reserved string “only”, _optionally_ > > followed by an identifier. As part of ‘mytest’, this should then be > > followed by the reserved string “end”. > > Look into option, optional, and optionMaybe.
And in particular, try doesn't do what you (Paul) think it does. try however is a rather important combinator of Parsec so I would behoove you to look up it's documentation and the explanations of it in the Parsec letter. _______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
