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From: AdaMagica <christoph.grein@eurocopter.com>
Newsgroups: comp.lang.ada
Subject: Re: Question about default discriminants and mutable objects.
Date: Wed, 5 May 2010 21:56:42 -0700 (PDT)
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Gene,
you guessed quite well. See Ada 83 Rationale

http://archive.adaic.com/standards/83rat/html/ratl-04-07.html#4.7

and especially 4.7.4.