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Newsgroups: comp.lang.ada
Date: Sun, 29 Oct 2017 17:16:42 -0700 (PDT)
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Subject: Re: What am I doing wrong with contracts?  Why are they succeeding
 when they should be failing?
From: Shark8 <onewingedshark@gmail.com>
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Xref: news.eternal-september.org comp.lang.ada:48650
Date: 2017-10-29T17:16:42-07:00
List-Id: <comp.lang.ada>

> procedure Multiply_By_Two(Arr : in out Int_Array)
>   with Pre  => (for all Item in Arr'Range =>
>                   Arr(Item) /= 6),
>        Post => (for all Item in Arr'Range =>
>                   Arr(Item) = Arr'Old(Item) * 2);
> 
> 
> I simply pass in the array into Multiply_By_Two and then print out the array as needed.  This is what gets me.  The array has elements going from 6 to 45.  

Your precondition is wrong then, all it's checking is that the [elements of the] inputs aren't 6, leaving things like 2 or 3 (or -17) as valid. I would recommend something like "with Pre  => (for all Item in Arr'Range => Arr(Item) in 6..45)".