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Date: Thu, 02 Oct 2008 16:35:39 +0200
From: Georg Bauhaus <rm.dash-bauhaus@futureapps.de>
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Subject: On pragma Precondition and types
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Date: 2008-10-02T16:35:40+02:00
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Suppose there is a type T with operations P and F,

   type T is private;

   procedure P (X: in out T);
   function  F (X: T) return Boolean;


I want to add a precondition of P. The precondition
involves F,

   procedure P (X: in out T);
   pragma Precondition (F(X));

   function  F (X: T) return Boolean;


But when the compiler sees the pragma Precondition,
it has not yet seen F.  Therefore, by the principle
of linear reading, the precondition cannot be compiled,
IIUC.

Could there be a rule for pragmas, say, allowing forward
references? Or can these rules be tied to some suitable
constraint syntax?