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From: Shark8 <OneWingedShark@gmail.com>
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Subject: Re: Generic formals and Aspects
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Date: 2014-10-17T19:43:37-06:00
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The following does work, though it doesn't catch it at compile-time:

    generic
       type Source_Type is range <>;
       type Destination_Type is range <>;

       S_First : Long_Long_Integer:= Long_Long_Integer(Source_Type'First);
       S_Last  : Long_Long_Integer:= Long_Long_Integer(Source_Type'Last);
       D_First : Long_Long_Integer:= 
Long_Long_Integer(Destination_Type'First);
       D_Last  : Long_Long_Integer:= 
Long_Long_Integer(Destination_Type'Last);
    function Saturate (X : Source_Type) return Destination_Type
      with Pre =>
               D_First >= S_First
           and D_Last  <= S_Last
      ;

Maybe this would be a good thing to suggest for the corrigenda -- 
addition of SUBTYPE to generic formals; the purpose thereof would be to 
"hang" Predicates on and [I think] Static_Predicate could be checked at 
compile-time.