Question about generic formal derived types

[adam@irvine.com]

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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