> In your example it's more or less guaranteed that putting "b" 
> and "c" will
> never happen, because the result of the combinated IO action 
> isn't demanded.

well yes, it was a bad example.  i got another answer basically saying
that threading could screw it up (i'm not using thread) as could,
perhaps, speculative evaluation, which is somewhat unfortunate, but i
can live with it.

 - hal
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