Index: src/library/scala/runtime/ScalaRunTime.scala
===================================================================
--- src/library/scala/runtime/ScalaRunTime.scala	(revision 16448)
+++ src/library/scala/runtime/ScalaRunTime.scala	(working copy)
@@ -82,7 +82,7 @@
     caseFields(x).mkString(x.productPrefix + "(", ",", ")")
 
   def _hashCode(x: Product): Int = {
-    var code = x.getClass().hashCode()
+    var code = 37
     val arr =  x.productArity
     var i = 0
     while (i < arr) {