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From: Simon Wright <simon.j.wright@mac.com>
Newsgroups: comp.lang.ada
Subject: Re: contracted exceptions
Date: Mon, 11 Jun 2007 20:50:05 +0100
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"Bob Spooner" <rls19@psu.edu> writes:

> "Simon Wright" <simon.j.wright@mac.com> wrote in message 
> news:m27iqd8g04.fsf@mac.com...

>> ... I agree that an exception message isn't of any use to the end
>> user (I suppose they may grow to learn that some messages happen
>> because of particular sequences of operations, and to avoid those
>> sequences).

> The exception message may be of use if it says that the problem is a
> missing data file that the user forgot to provide.

With GNAT, the exception message would be something like
... NAME_ERROR ... which isn't a lot of help! If the programmer can go
to the trouble of reporting the missing file name, then he has quite
likely considered some sort of recovery mechanisms. I was thinking of
the sort of exception that hadn't been planned for.