From mboxrd@z Thu Jan  1 00:00:00 1970
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From: dewar@cs.nyu.edu (Robert Dewar)
Subject: Re: type casting tagged types in the wrong direction
Date: 1996/03/28
Message-ID: <dewar.828062940@schonberg>#1/1
X-Deja-AN: 144774080
references: <3159B860.28A6@csehp3.mdc.com>
 <4je8f8$174r@watnews1.watson.ibm.com>
organization: Courant Institute of Mathematical Sciences
newsgroups: comp.lang.ada
Date: 1996-03-28T00:00:00+00:00
List-Id: <comp.lang.ada>

Norman said:

"The expression Jim.Z is perfectly legal, but the type conversion C(Jane)
is not.  This should be flagged as a compile-time error, because it does
not satisfy the conditions in either 4.6(22) or 4.6(23)."

GNAT certainly agrees:

    28.   Jim := C (Jane);
                    |
        >>> downward conversion of tagged objects not allowed

:-)