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Date: Sat, 15 Nov 2003 19:25:34 -0500
From: "Robert I. Eachus" <rieachus@comcast.net>
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Subject: Re: Clause "with and use"
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Xref: archiver1.google.com comp.lang.ada:2524
Date: 2003-11-15T19:25:34-05:00
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Gautier wrote:

> This is not a problem, because they are *already* very different.
> 
> To take Robert examples,
> 
>   use ASCII;
>   procedure Junk is
>   begin null; end Junk;
> 
> (won't compile) is not at all the same as
> 
>   procedure Junk is
>     use ASCII;
>   begin null; end Junk;
> 
> (meaningful). 
> 
> The example Outer / Inner is interesting.
> 
>   package Outer is
>     package Inner is end;
>     procedure Dummy;  
>   end Outer;
> 
>   use Outer.Inner;
>   package body Outer is
>     procedure Dummy is
>     begin
>       null;
>     end Dummy;
>   end Outer;
> 
> is accepted by GNAT 3.15p but rejected by ObjectAda 7.2.2 !
> At least it could speak for the "with and use" syntax of the
> proposal.

Wow! That was fast, my code sample was only up for a short time and at 
least two bug reports resulted.  I used to say that I had two modes of 
writing Ada, in one I expected to write tens of thousands of lines 
between compiler bug reports.  In the language lawyer mode, if I didn't 
generate one bug report per every twenty lines or so, I was slacking.

Saying use Ascii; in a context clause is almost cheating in the second 
mode.  It is such a special case, probably never occurs in "real" code, 
and takes a lot of work by compiler developers to get right. (If you do 
send in a bug report, please! don't mention my name.  As far as I am 
concerned this is a pathological case.)

The "use Outer.Inner" case is a bit more troubling.  If the compiler 
also breaks on "with Outer; use Outer.Inner; package Foo is..." then I 
think it is worth a bug report.
-- 
                                           Robert I. Eachus

100% Ada, no bugs--the only way to create software.