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Newsgroups: comp.lang.ada
Date: Mon, 2 Apr 2018 04:25:09 -0700 (PDT)
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Subject: Re: limited agregate and limited components default initialization
From: Jean-Claude Rostaing <00120260a@gmail.com>
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Xref: reader02.eternal-september.org comp.lang.ada:51293
Date: 2018-04-02T04:25:09-07:00
List-Id: <comp.lang.ada>

It works, so much for "impossible" dmitry.

I probably read before the implementation you mentioned, I don't remember exactly. I saw something strange writing this. Shouldn't the expression function 
function GET (Pointer : Pointer_Type) return Accessor_Type is
     (if Pointer.Pointer = null or else POINTER.Pointer.Value = null then raise EXC_NULL_POINTER_ACCESS
      else ACCESSOR_TYPE'(Data_Link => Pointer.Pointer.Value));
be strictly equivalent to 
function GET (Pointer : Pointer_Type) return Accessor_Type is
   begin
      if Pointer.Pointer = null or else POINTER.Pointer.Value = null then raise EXC_NULL_POINTER_ACCESS;
      else
         return ACCESSOR_TYPE'(Data_Link => Pointer.Pointer.Value);
      end if;
   end GET;
? Yet no, the second is fine, the second raises at run time
raised CONSTRAINT_ERROR : pointers.adb:20 discriminant check failed