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Newsgroups: comp.lang.ada
Date: Fri, 30 Jun 2017 14:29:36 -0700 (PDT)
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Subject: Puzzled by SPARK global aspect
From: digitig <digitig@gmail.com>
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Xref: news.eternal-september.org comp.lang.ada:47243
Date: 2017-06-30T14:29:36-07:00
List-Id: <comp.lang.ada>

Suppose in my package specification I have

   type Quadrant_Specification_Array is 
   array(Global.Quadrant_X_Index'Range, Global.Quadrant_Y_Index'Range) 
   of Quadrant_Specification;

(With QuadrantSpecification being a record type) and in my package body I have:

   function N_Total_Klingons return Global.Klingon_Counter
       with
         Refined_Global => (Input => Quadrant_Specifications)
   is
      Total: Global.Klingon_Counter := 0;
   begin
      for X in Quadrant_Specifications'Range loop
         for Y in Quadrant_Specifications'Range(2) loop
            Total := Total + Quadrant_Specifications(X, Y).N_Klingons;
         end loop;
      end loop;
      return Total;
   end N_Total_Klingons;

Spark gives me an error
  useless refinement, subprogram "N_Total_Klingons" does not depend on abstract state with visible refinement

But if I take the Refined_Global specification out I get the error

  "Quadrant_Specifications" must be listed in the Global aspect of "N_Total_Klingons"

I feel I'm losing either way - if I do specify it I'm wrong, if I don't specify it I'm wrong.

How *do* I fix this?