Fix issue 221:...

src/runtime.cc

Index: src/runtime.cc
===================================================================
--- src/runtime.cc	(revision 1201)
+++ src/runtime.cc	(working copy)
@@ -4061,7 +4061,9 @@
   while (!context.is_null()) {
     receiver = context->Lookup(Factory::eval_symbol(), FOLLOW_PROTOTYPE_CHAIN,
                                &index, &attributes);
-    if (attributes != ABSENT) break;
+    // Stop search when eval is found or when the global context is
+    // reached.
+    if (attributes != ABSENT || context->IsGlobalContext()) break;
     if (context->is_function_context()) {
       context = Handle<Context>(Context::cast(context->closure()->context()));
     } else {
@@ -4069,6 +4071,15 @@
     }
   }
 
+  // If eval could not be resolved, it has been deleted and we need to
+  // throw a reference error.
+  if (attributes == ABSENT) {
+    Handle<Object> name = Factory::eval_symbol();
+    Handle<Object> reference_error =
+        Factory::NewReferenceError("not_defined", HandleVector(&name, 1));
+    return Top::Throw(*reference_error);
+  }
+
   if (context->IsGlobalContext()) {
     // 'eval' is bound in the global context, but it may have been overwritten.
     // Compare it to the builtin 'GlobalEval' function to make sure.