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Date: Fri, 12 Oct 2018 17:48:04 -0700 (PDT)
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Subject: In mode parameter in an assignment statement
From: Anh Vo <anhvofrcaus@gmail.com>
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Xref: reader02.eternal-september.org comp.lang.ada:54557
Date: 2018-10-12T17:48:04-07:00
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   -- ...

   ------------------
   -- Compute_Data --
   ------------------

   procedure Compute_Data (Region : Mapped_Region) is
      Data_Shift : constant Storage_Offset :=
         Storage_Offset (Region.User_Offset - Region.System_Offset);
   begin
      if Region.User_Size = 0 then
         Region.Data := Empty_String'Address;
      elsif Region.Mapped then
         Region.Data := Region.Mapping.Address + Data_Shift;
      else
         Region.Data := Region.Buffer.all'Address + Data_Shift;
      end if;
   end Compute_Data;

end GNATCOLL.Mmap;

The above code is the tail end of package gnatcoll-mmap.adb.

I thought it should be rejected during compilation because in mode parameter is not allowed in an assignment statement. But, it was compiled successfully under GNAT obviously.

What did I miss? Thanks in advance.

Anh Vo