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From: "Grein, Christoph" <christoph.grein@eurocopter.com>
Newsgroups: comp.lang.ada
Subject: Re: Extension of non-limited type needs limited component
Date: Fri, 15 Nov 2002 11:47:49 +0100 (MET)
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Date: 2002-11-15T11:47:49+01:00

> >This is not SmallTalk, where you can dispatch to a method that does not
> >exist.
> 
> Sure? And what about this:
> 
> type A is tagged ...
> procedure Foo (L, R : A);
> 
> type B is new A with ....
> 
> X : A'Class := Some_A;
> Y : A'Class := Some_B;
> 
> Foo (X, Y); -- Oops, dispatching to nowhere!

Either compiler catches this and does not compile.
Or during runtime, tag check is performed and will raise Constraint_Error.

No dispatching to nowhere!