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From: xorque <xorquewasp@googlemail.com>
Newsgroups: comp.lang.ada
Subject: Workaround for invariant SPARK condition
Date: Wed, 24 Jun 2009 16:03:44 -0700 (PDT)
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Date: 2009-06-24T16:03:44-07:00
List-Id: <comp.lang.ada>

Hello.

I have a piece of code that does this:

function Check_Support (Request : in Request_t) return Boolean is
begin
  return Request /= Unsupported;
end Check_Support;

I'm using it in some code:

if Check_Support (Request_Push) then
  ...
end if;

Request_Push is a compile-time constant with an implementation-defined
value. Given that the value is detected at compile-time, SPARK thinks
the
condition is invariant.

Is there some way I can tell SPARK that this condition isn't actually
invariant,
even though it appears to be?