opal.diff

--- opal-orig.js	2014-02-10 18:34:16.493742000 +0100
+++ opal.js	2014-02-10 18:37:39.227193495 +0100
@@ -681,6 +681,7 @@
     // }
 
     if (included_in) {
+      print("loop-start, included_in.length=" + included_in.length);
       for (var i = 0, length = included_in.length; i < length; i++) {
         var includee = included_in[i];
         var dest = includee._proto;
@@ -695,6 +696,7 @@
           Opal.donate(includee, defined, true);
         }
       }
+      print("loop-done");
     }
   };