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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: GNAT user-specified (via Raise_Exception) warning message size
 limit
Date: Fri, 16 Feb 2018 18:03:10 -0600
Organization: JSA Research & Innovation
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Date: 2018-02-16T18:03:10-06:00
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<marciant@earthlink.net> wrote in message 
news:789f6417-5e6f-4d5f-8abb-80246f4f405a@googlegroups.com...
...
>It seems that although quite long messages are accepted at calls to it, the
>message then retrieved and printed within a handler that uses
>Ada.Exceptions.Exception_Message on the occurrence only returns a
>truncated part of the original message - around the first 200 characters
>are returned and the rest is truncated.

For what it's worth, portable Ada code should not depend on exception 
messages longer than 200 characters, see RM 11.4.1(18).

For Janus/Ada, the truncation happens because an exception occurrence only 
has space for 200 characters. One could change the limited, but 
recompilation of the runtime clearly would be needed since it would change 
the definition/representation of the Exception_Occurrence type.

It sounds like GNAT is similar.

                                                 Randy.