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From: "Grein, Christoph" <christoph.grein@eurocopter.com>
Newsgroups: comp.lang.ada
Subject: Re: Access to subprogram
Date: Tue, 7 May 2002 14:56:25 +0200 (MET DST)
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Date: 2002-05-07T14:56:25+02:00

> 
> What is the meaning of this
> " subprogram must not be deeper than access type"

package Pak is

  type Access_P is access procedure;
  Global: Access_P;

end Pak;

with Pak;
procedure Proc is

  procedure Local is separate;
  LA: Pak.Access_P := Local'Access;

begin
  Global := LA;
end Proc;

Here Local has a deeper level than Access_P, i.e. a shorter lifetime. The 
aforementioned rule forbids such a use as LA, since Global will point to a 
non-existing item after Porc has finished.