> Bradd W. Szonye wrote:
>> That's why it "raises an exception" rather than "signals an error."
>> While it isn't necessarily an error, it is an exceptional condition,
>> because the procedure can't supply the requested data.

xxxxxx@freenetproject.org wrote:
> Nevertheless, I'm not sure its a good fit with whats happening.
> Besides, both models are possible with an absence thunk:
>
> (define (absence-exception) (raise foo))
>
> (operator value absence-exception)
>
> ... while the absence thunk itself is conceptually and mechanically
> simpler.

I wouldn't go that far, but I'll agree that the exception-raising method
is not clearly superior. Therefore, this is a matter of personal
preference, barely even a minor issue.
--
Bradd W. Szonye
http://www.szonye.com/bradd