Actually, on second thought, Lennart is probably right.  Continuations are probably overkill for this situation.
Since not wanting to continue is probably an 'erroneous condition,' you may as well use Error.

Cheers,
 - Tim

2010/6/10 Lennart Augustsson <lennart@augustsson.net>
I would not use the continuation monad just for early exit.  Sounds
like the error monad to me.

2010/6/10 Günther Schmidt <gue.schmidt@web.de>:
> Hi everyone,
>
> I'm about to write a rather lengthy piece of IO code. Depending on the
> results of some of the IO actions I'd like the computation to stop right
> there and then.
>
> Now I know in general how to write this but I'm wondering if this is one of
> those occasions where I should make use of the Cont monad to make an early
> exit.
>
> Günther
>
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