Oops. Forgot to throw *new* $EvalError.

src/v8natives.js

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 88 matching lines @@
 // ECMA-262 - 15.1.2.3
 function GlobalParseFloat(string) {
   return %StringParseFloat(ToString(string));
 }
 
 
 function GlobalEval(x) {
   if (!IS_STRING(x)) return x;
 
   if (this !== %GlobalReceiver(global)) {
-    throw $EvalError('The "this" object passed to eval ' + 
-                     'must be the global object from which eval originated');
+    throw new $EvalError('The "this" object passed to eval must ' + 
+                         'be the global object from which eval originated');
   }
   
   var f = %CompileString(x, 0, true);
   if (!IS_FUNCTION(f)) return f;
 
   return f.call(%EvalReceiver(this));
 }
 
 
 // execScript for IE compatibility.
@@ skipping 410 matching lines @@
 // ----------------------------------------------------------------------------
 
 function SetupFunction() {
   InstallFunctions($Function.prototype, DONT_ENUM, $Array(
     "toString", FunctionToString
   ));
 }
 
 SetupFunction();