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Date: Tue, 30 Oct 2012 06:26:08 -0700 (PDT)
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Subject: Static bounds of loop - compilation error
From: pascal.malaise@gmail.com
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Date: 2012-10-30T06:26:08-07:00
List-Id: <comp.lang.ada>

Hi Ada experts,

can anyone explain the following compilation errors:
procedure T is
  type E is (A, B, C);
  subtype S is E range A .. B;
  X, Y : S;
begin
  X := A;
  Y := B;
  for I in S range X .. Y loop
    case I is
      when A => null;
      when B => null;
    end case;
  end loop;
end T;
>> missing case value: "C"

A similar example where S is a subtype of Positive leads to the same  error and also: bounds of "I" are not static, alternatives must cover base type

Indeed, X and Y are not static but the bounds of S are, and all the values of S are covered in the "case".

So is it a bug?

Thank you