@@ -4,9 +4,9 @@
 import driver;
 
 class GUI(Solver) : Form, GameObserver
 {
-	this(const(Game) g)
+	this(in Game g)
 	{
 		this.solver = new Solver(g);
 		setup_size(g.map.W, g.map.H);
 		setup_resources();