Newbie question about pointers in GNAT 3.15p on Windows 2000

[David Gressett <gressett@airmail.net>]

I have the following package which I am trying to compile with GNAT
3.15p on Windows 2000:

-----------------------------------------------------------------------
package Miscellaneous3 is

  
  function X
    return String;
    
end Miscellaneous3;


package body Miscellaneous3 is

  -----------------------
  -- X --
  -----------------------
  
  type P_Integer is access all Integer;

  function X
    return String
  is
    Bufsize: Aliased Integer;
    P_Size: P_Integer;
    
  begin
    Bufsize := 1;
    P_Size := BufSize'Access;
    return "";
  end X;

end Miscellaneous3;

---------------------------------------------------------------------
Compilation produces this error message:

miscellaneous3.adb:17:15 non-local pointer cannot point to local
object

I have no idea what "local" means here -  both the pointer P_Size and
the pointed-to variable Bufsize are defined in the same place.

What am I doing wrong?