Help! type extensions - Gnat for Win95

[lance@lainet.com (Lance )]

I am trying to make a hierarchy of data structures as a hierarchy of
types.   Consider the following code:

---------------------------------------------------------------------------
package Containers is
  type Container is abstract tagged private;
private
  type Container is abstract tagged null record;
end Containers;

package Containers.Stacks is
  type Stack is new Container with private;
  procedure Put (S: Stack) is abstract;
private
  type Stack is new Container with null record;
end Containers.Stacks;

package Containers.Stacks.Bounded_Stacks is
  type Bounded_Stack is limited private;
private
  type Bounded_STack is new *Stack with record
      ---------
      ---------
  end record;
end Containers.Stacks.Bounded_Stacks;
------------------------------------------------------------------------------------

All of the above code compiles fine.  However, I try to use the
package in test program the compiler tells me  "type extension at
deeper accessibility level than parent." at the line in
Containers.Stacks.Bounded_STacks that defines the type. (marked with *
above)
  

Thanks in advance for any help that you may be able to provide.

Lance
lance@lainet.com