#-*-c++-*-

layerinfo "type" = "core";
layerinfo "majorversion" = 0;

class Tree {  function grow; }
class Maple extends Tree { }
class Oak extends Tree {  }

function Tree::grow { "Tree grows.\n"; }
function Maple::grow { "Maple grows.\n"; }

function main ()
{
  var Tree t;
  $t = new Maple;  $t->grow();
  $t = new Oak;    $t->grow();
  var Tree notree; 
  $notree->grow();
}