simple programs -> one file with gps 2008 (gpl)?

[Marcus Lauster <marcus.lauster@gmx.de>]

Hi,

I'm new to Ada and therefore I'm digging through the book "Programming 
in Ada 2005". In Chapter 4 on Page 57 the autor states: "Complete simple 
Programms might be presented in a single file." Furthermore he outlines 
the structure of how such a simple program might look.

package x is -- spec and body of Objects
with x; use x;
package xx is --
with xx; use xx;
...
procedure Main is...

I typed a program with similar structure into GPS 2008 (GPL) and while 
trying to compile the GPS compiler aborted with the following message

"end of file expected, file can have only one compilation unit"

So my question is how to convince the underlying compiler of GPS that my 
program is a simple program.

Regards