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From: Jeffrey Carter <spam.jrcarter.not@spam.acm.not.org>
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Subject: Re: Structured exception information
References: <eog0g5$2bn$1@cernne03.cern.ch>
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Applying the KISS principle, I'd think the way to do this would be

with Ada.Exceptions;
generic -- Exceptions_With_Info
    type Problem_Info (<>) is limited private;

    with function Image (Value : Problem_Info) return String;
    with function Value (Image : String) return Problem_Info;
package Exceptions_With_Info is
    procedure Raise_With_Info (ID   : in Ada.Exceptions.Exception_ID;
                               Info : in Problem_Info);

    procedure Raise_With_Info
       (Occurrence : in Ada.Exceptions.Exception_Occurrence;
        Info       : in Problem_Info);

    function Info (Occurrence : Ada.Exceptions.Exception_Occurrence)
    return Problem_Info;
end Exceptions_With_Info;