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Date: Fri, 20 Jun 2008 00:48:36 +0200
From: Georg Bauhaus <rm.tsoh.plus-bug.bauhaus@maps.futureapps.de>
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Subject: Re: Defect with formal package parameters
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Date: 2008-06-20T00:48:37+02:00
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Eric Hughes wrote:
> GNAT 2008 (just installed) fails to compile the following example,
...
> =======================================================
> package Foo is
>    pragma Elaborate_Body( Foo ) ;
> 
>    generic
>       with procedure Operation is <> ;
>    package Signature is end ;
> 
>    procedure Operation_Actual is null ;
>    package Impl is new Signature( Operation => Operation_Actual ) ;
> 
>    generic
>       with package S is new Signature( others => <> ) ;
>       -- with package S is new Signature( <> ) ;
>    package Module is end ;
> 
>    package M is new Module( S => Impl ) ;
> end ;
> =======================================================

Another workaround:

package Foo is
   pragma Elaborate_Body( Foo ) ;

   generic
      with procedure Operation is <> ;
   package Signature is end ;

   procedure Operation is null ;
   package Impl is new Signature ;

   generic
      with package S is new Signature( others => <> ) ;
   package Module is end ;

   package M is new Module( S => Impl ) ;
end ;