Oops. Forgot to throw *new* $EvalError.

src/v8natives.js

Index: src/v8natives.js
===================================================================
--- src/v8natives.js	(revision 757)
+++ src/v8natives.js	(working copy)
@@ -106,8 +106,8 @@
   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);