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From: Robert A Duff <bobduff@TheWorld.com>
Newsgroups: comp.lang.ada
Subject: Re: Finalization of library level tasks
Date: Tue, 17 Apr 2018 18:00:04 -0400
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Date: 2018-04-17T18:00:04-04:00
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"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:

>    task body T is
>    begin
>       while T'Callable loop
>          ...
>       end loop;
>    end T;
>
> must work, GNAT is correct, I am happy.

I'm not sure what you mean by "work".  GNAT correctly
compiles that into an infinite loop, as J-P explained.
Here's a complete example:

with Text_IO; use Text_IO;
package Foo is
   task T;
end Foo;

package body Foo is
   task body T is
   begin
      while T'Callable loop
         Put_Line("Hello");
         delay 2.0;
      end loop;
   end T;
end Foo;

procedure Foo.Main is
begin
   null;
end Foo.Main;

This prints "Hello" every 2 seconds until you get 
bored and kill it.

I think perhaps you wanted to query Callable on the environment
task, not T.  If so, please post a complete example, and say
what GNAT is doing, and why you think that's wrong (or right?).

- Bob