diff --git a/vala/gvala/gvala.vala b/vala/gvala/gvala.vala
index 92a2fbe..9ced8a6 100644
--- a/vala/gvala/gvala.vala
+++ b/vala/gvala/gvala.vala
@@ -1,28 +1,45 @@
 class Base : GLib.Object {
-  public virtual void copy () {
-    stdout.printf ("Base copy() called\n");
+  public int b;
+
+  public virtual void copy_from (Base b) {
+    stdout.printf ("Base copy_from() called\n");
+    this.b = b.b;
   }
 }
 
 class Sub : Base {
-  public override void copy () {
-    stdout.printf ("Sub copy() called\n");
+  public int s;
+
+  public override void copy_from (Base b) {
+    stdout.printf ("Sub copy_from() called\n");
+    this.s = ((Sub)b).s;
   }
 }
 
 class SubSub : Sub {
-  public override void copy () {
-    stdout.printf ("SubSub copy() called\n");
+  public int ss;
+  public int s;
+
+  public override void copy_from (Base b) {
+    stdout.printf ("SubSub copy_from() called\n");
+    this.ss = ((SubSub)b).ss;
+    //((Sub)this).copy_from(b);
   }
 }
 
 class GVala : GLib.Object {
   public static int main (string[] args) {
-    // var base = new Base();
-    // var sub = new Sub();
-    Base b = new SubSub();
+    var src = new SubSub();
+    src.b = 1;
+    src.s = 2;
+    src.ss = 3;
 
-    b.copy();
+    Base b = new SubSub();
+    b.copy_from(src);
+
+    var ss = (SubSub) b;
+
+    stdout.printf ("b = %d, s = %d, ss = %d\n", ss.b, ss.s, ss.ss);
 
     return 0;
   }