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From: "Peter C. Chapin" <pcc482719@gmail.com>
Subject: Q: SPARK visibility rules and inherit annotations.
Newsgroups: comp.lang.ada
Date: Wed, 19 May 2010 11:04:05 -0400
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Date: 2010-05-19T11:04:05-04:00
List-Id: <comp.lang.ada>

I'm working on a SPARK program. Right now I'm just doing design so my focus is
on package specifications; there are no package bodies. I'm having some
trouble with the following:

with TMLib.Cryptographic_Services;

--# inherit TMLib.Cryptographic_Services;
package TMLib.Credentials is
   type Credential_Type is private;

   -- Converts the raw bytes of a certificate transfer format to a credential.
   procedure Certificate_To_Credential
     (Raw_Data   : in TMLib.Cryptographic_Services.Octet_Array;
      Credential : out Credential_Type;
      Valid      : out Boolean);
   --# derives Credential from Raw_Data &
   --#         Valid      from Raw_Data;

   -- Other stuff not shown here...
end TMLib.Credentials;

The SPARK Examiner complains about the use of "Cryptographic_Services" in the
declaration of the Raw_Data parameter to the procedure. Specifically I get
error 754 that says (roughly) "The identifier Cryptographic_Services is not
declared or not visible." I am then told that I probably need both a 'with'
statement in the context clause and an 'inherit' annotation. Don't I have
those things?

Note that TMLib.Cryptographic_Services examines without error but it does
generate a warning because the private section is empty and currently hidden
from SPARK with a 'hide' annotation. It seems unlikely to me that has
anything to do with my problem. Note that TMLib.Cryptographic_Services is a
public child of TMLib.

I tried adding a 'with TMLib;' in the context clause but that didn't have any
effect. I realize the problem is probably something silly but I'm a bit
baffled here. Any pointers would be appreciated.

Thanks!

Peter