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From: Robert A Duff <bobduff@shell01.TheWorld.com>
Newsgroups: comp.lang.ada
Subject: Re: Possible Ada deficiency? (goto)
Date: 15 Jan 2005 14:34:06 -0500
Organization: The World Public Access UNIX, Brookline, MA
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Date: 2005-01-15T14:34:06-05:00
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"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:

> On 15 Jan 2005 12:34:59 -0500, Robert A Duff wrote:
> 
> >     procedure P is
> >         --(1)
> >     begin
> >         for Mumble in 1..10 loop
> >             <<Mumble>> --(2)
> >             null;
> >         end loop;
> >     end P;
> > 
> > Here's why the above is illegal:  There is an implicit declaration of
> > label Mumble at that place marked "--(1)".
> 
> Why not in the loop's body? After all one cannot jump into the loop body?

I don't know.  Perhaps because the rules for goto labels are the same as
for block names, and maybe it makes expanded names work better.

> > At the place marked "--(2)",
> > this this declaration is not directly visible, because it is hidden by
> > the loop parameter Mumble.  Thus, the reference to Mumble at "--(2)"
> > is illegal.  That's just plain weird.
> 
> Interesting is that labels, types and objects share the same name space.

Seems like the simplest rule, for both programmer and compiler.

> For labels it looks as if somebody planned to implement FORTRAN's:
> 
> ASSIGN 100 K
> ...
> GOTO K
> 
> (I like that language! (:-))

;-)

- Bob