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From: Gautier Write-only <gautier@fakeaddress.nil>
Newsgroups: comp.lang.ada
Subject: Re: Clause "with and use"
Date: Sat, 15 Nov 2003 17:40:54 +0100
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Russ:

> > No, absolutely not. The implied "with" would apply only to "use"
> > clauses in the context section at the top of the file. You need
> > something at the top of the file to let the reader (and the compiler)
> > know what external packages will be used.

Chad R. Meiners:

> Which would imply that use clauses would have very different semantics based
> upon the scope in which they are placed.

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.

________________________________________________________
Gautier  --  http://www.mysunrise.ch/users/gdm/gsoft.htm

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