anchor.diff:  
   	m.destroy();
   	
  -	if check(m2, '5 4 3 -1 -2 1') then
  -		writeln('Ok')
  -	else
  -		writeln('Foo');
  +	check(m2, '5 4 3 -1 -2 1');
   
   	m2.destroy();
   end;
  
positive.code: 	m.push_back(4);
  	m.push_back(5);
  
  	if check(m, '1 2 3 4 5') then
  		writeln('Ok')
  	else
  		writeln('Foo');
  
  	it := m.get_begin();
  	it.next();
  
negative.code: 	m.erase(it);
  	it.destroy();
  
  	check(m, '1 -2 -1 3 4 5');
  	
  	m2 := container.create();
  	while not m.empty() do
  