Make sure to check that the function prototype is a ...

test/mjsunit/instanceof.js

Index: test/mjsunit/instanceof.js
===================================================================
--- test/mjsunit/instanceof.js	(revision 470)
+++ test/mjsunit/instanceof.js	(working copy)
@@ -60,11 +60,14 @@
 
 function TestExceptions() {
   function F() { }
+  function G() { }
+  G.prototype = undefined;
   var items = [ 1, new Number(42), 
                 true, 
                 'string', new String('hest'),
                 {}, [], 
-                F, new F(), 
+                F, new F(),
+                G, new G(),
                 Object, String ];
 
   var exceptions = 0;
@@ -80,8 +83,8 @@
       }
     }
   }
-  assertEquals(10, instanceofs);
-  assertEquals(88, exceptions);
+  assertEquals(12, instanceofs);
+  assertEquals(130, exceptions);
 }
 
 TestExceptions();