filter cross context eval

src/v8natives.js

Index: src/v8natives.js
diff --git a/src/v8natives.js b/src/v8natives.js
index 602d75b5b9ffadb5b395f06e3339d5bb7d76b456..68ca9001864afa5888bd1a6316f657e39f8bf414 100644
--- a/src/v8natives.js
+++ b/src/v8natives.js
@@ -1840,7 +1840,9 @@ function FunctionConstructor(arg1) {  // length == 1
   var global_receiver = %GlobalReceiver(global);
   // Compile the string in the constructor and not a helper so that errors
   // appear to come from here.
-  var f = %_CallFunction(global_receiver, %CompileString(source, true));
+  var f = %CompileString(source, true);
+  if (!IS_FUNCTION(f)) return f;
+  f = %_CallFunction(global_receiver, f);
   %FunctionMarkNameShouldPrintAsAnonymous(f);
   return f;
 }