On Thu, Dec 02, 2004 at 02:48:07PM +0000, Mark Carroll wrote:
> Is there a way in Parsec to, within a parser, throw an error generated
> by another parser? For instance, something of type
>
> ParseError -> GenParser tok st a
>
> or whatever.
I guess no. I tried hard to find this about a month ago, but my best
approximation was something like this:
do setPosition (errorPos err)
fail (messageString (head (errorMessages err)))
which is very, very unsatisfying.
It would be nice, if there were explicit functions in Parsec for this and
also:
instance Control.Monad.Error.MonadError ParseError (GenParser tok st) ...
Best regards,
Tomasz
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