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From: Charles Hixson <charleshixsn@earthlink.net>
Subject: Re: Software landmines (loops)
Date: 1998/09/04
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Loryn Jenkins wrote:
..
> Ah! For some reason, I thought you were testing the first item on the
> stack. So, my amended code, to match your semantics is thus:
> 
>  equal (l,r: LIST): BOOLEAN is
>        require
>                l /= Void and r /= Void
>        do
>                Result := l.count /= r.count
>                if Result then
>                        from
>                                l.start; r.start
>                        until
>                                not Result or l.off
>                        loop
>                                Result := l.item /= r.item
>                                l.forth; r.forth
>                        end
>                end
>        end
> 
...
> 
> Loryn Jenkins
> 
> PS: I really would agree with you if the only counter examples were Tim
> McDermott's and Jim Cochrane's ones.
Is the if test important?  The until test should catch it anyway, and
the code would read more cleanly without it.