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From: adam@irvine.com
Subject: Question about generic formal derived types
Date: 1999/03/30
Message-ID: <7dpgl4$h2j$1@nnrp1.dejanews.com>#1/1
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Date: 1999-03-30T00:00:00+00:00
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In this program fragment:

-------------------------------------------------------------------------------
package Pack1 is
    type Root_Type is tagged record
        Field1 : Integer;
        Field2 : Boolean;
    end record;
end Pack1;

with Pack1;
generic
    type Formal_Type is new Pack1.Root_Type with private;
package Pack2 is
    type New_Type is new Formal_Type with record
        Field3 : Character;
    end record;
end Pack2;

with Pack1;
package Pack3 is
    type Root_Type_Extension is new Pack1.Root_Type with record
        Field3 : Float;
    end record;
end Pack3;

. . .

with Pack2;
with Pack3;
package body Pack4 is

    package Instantiation is new Pack2 (Pack3.Root_Type_Extension);

    procedure Inner is
        X : Character;
        Y : Instantiation.New_Type;
    begin
        X := Y.Field3;
    end Inner;

end Pack4;

-------------------------------------------------------------------------------

I can't believe that a record type can have two components of the same name,
but it appears that Instantiation.New_Type would have two components named
Field3.

When Y.Field3 is accessed, which Field3 is meant?

Which language rules in the RM govern this situation?

				-- thanks, Adam

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