Make sure that the body of the function created by calling Function is...

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 183 matching lines @@
   }
 });
 
 
 // ----------------------------------------------------------------------------
 // Global stuff...
 
 %AddProperty(global, "eval", function(x) {
   if (!IS_STRING(x)) return x;
 
-  var f = %CompileString(x, true);
+  var f = %CompileString(x, 0, true);
   if (!IS_FUNCTION(f)) return f;
 
   return f.call(%EvalReceiver(this));
 }, DONT_ENUM);
 
 
 // execScript for IE compatibility.
 %AddProperty(global, "execScript", function(expr, lang) {
   // NOTE: We don't care about the character casing.
   if (!lang || /javascript/i.test(lang)) {
-    var f = %CompileString(ToString(expr), false);
+    var f = %CompileString(ToString(expr), 0, false);
     f.call(global);
   }
   return null;
 }, DONT_ENUM);
 
 
 // ----------------------------------------------------------------------------
 // Boolean
 
 %AddProperty($Boolean.prototype, "toString", function() {
@@ skipping 173 matching lines @@
     // Array.prototype.join replaces null with empty strings which is
     // not appropriate.
     for (var i = 0; i < n - 1; i++) p[i] = ToString(%_Arguments(i));
     p = p.join(',');
     // If the formal parameters string include ) - an illegal
     // character - it may make the combined function expression
     // compile. We avoid this problem by checking for this early on.
     if (p.indexOf(')') != -1) throw MakeSyntaxError('unable_to_parse',[]);
   }
   var body = (n > 0) ? ToString(%_Arguments(n - 1)) : '';
-  var source = '(function anonymous(' + p + ') { ' + body + ' })';
+  var source = '(function(' + p + ') {\n' + body + '\n})';
 
   // The call to SetNewFunctionAttributes will ensure the prototype
   // property of the resulting function is enumerable (ECMA262, 15.3.5.2).
-  return %SetNewFunctionAttributes(%CompileString(source, false)());
+  var f = %CompileString(source, -1, false)();
+  %FunctionSetName(f, "anonymous");
+  return %SetNewFunctionAttributes(f);
 };
 
 %SetCode($Function, NewFunction);