/usr/share/doc/libtexttools-doc/examples/basic.adb is in libtexttools-doc 2.1.0-6build2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | with Common, OS, UserIO, Controls, Windows;
use  Common, OS, UserIO, Controls, Windows;
procedure basic is
   ch : character; -- key pressed
   pragma Unreferenced (Ch);
begin
  StartupCommon( "TIA", "tia" );
  StartupOS;
  StartupUserIO;
  StartupControls;
  StartupWindows;
  OpenWindow( "Basic Window", 0, 0, 40, 20, normal, false );
  DrawWindow;
  MoveTo( 2, 2 );
  Draw( "This is a basic TextTools window." );
  MoveTo( 2, 3 );
  Draw( "It contains no controls." );
  MoveTo( 2, 18 );
  Draw( "Press any key to quit." );
  GetKey( ch );
  CloseWindow;
  ShutdownWindows;
  ShutdownControls;
  ShutdownUserIO;
  ShutdownOS;
  ShutdownCommon;
end basic;
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