*** old/src/java.base/share/classes/java/lang/invoke/MethodHandleImpl.java	Thu Jan 22 20:49:34 2015
--- new/src/java.base/share/classes/java/lang/invoke/MethodHandleImpl.java	Thu Jan 22 20:49:33 2015

*** 1662,1667 ****
--- 1662,1676 ----
      private static MethodHandle buildArrayProducer(Class<?> arrayType) {
          Class<?> elemType = arrayType.getComponentType();
          assert(elemType.isPrimitive());
          return Lazy.MH_copyAsPrimitiveArray.bindTo(Wrapper.forPrimitiveType(elemType));
      }
+ 
+     /*non-public*/ static void assertSame(Object mh1, Object mh2) {
+         if (mh1 != mh2) {
+             String msg = String.format("mh1 != mh2: mh1 = %s (form: %s); mh2 = %s (form: %s)",
+                     mh1, ((MethodHandle)mh1).form,
+                     mh2, ((MethodHandle)mh2).form);
+             throw newInternalError(msg);
+         }
+     }
  }