Don't use local variable after its scoped has been left.

src/d8.cc

 // Copyright 2012 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 1479 matching lines @@
   delete[] chars;
   return result;
 }
 
 
 void Shell::RunShell(Isolate* isolate) {
   Locker locker(isolate);
   Context::Scope context_scope(evaluation_context_);
   HandleScope outer_scope;
   Handle<String> name = String::New("(d8)");
-  DumbLineEditor dumb_line_editor(isolate);
   LineEditor* console = LineEditor::Get();
   printf("V8 version %s [console: %s]\n", V8::GetVersion(), console->name());
   console->Open();
   while (true) {
     HandleScope inner_scope;
     Handle<String> input = console->Prompt(Shell::kPrompt);
     if (input.IsEmpty()) break;
     ExecuteString(input, name, true, true);
   }
   printf("\n");
@@ skipping 384 matching lines @@
   }
 #endif  // V8_SHARED
   return 0;
 }
 
 
 int Shell::Main(int argc, char* argv[]) {
   if (!SetOptions(argc, argv)) return 1;
   int result = 0;
   Isolate* isolate = Isolate::GetCurrent();
+  DumbLineEditor dumb_line_editor(isolate);
   {
     Initialize(isolate);
     Symbols symbols(isolate);
     InitializeDebugger(isolate);
 
     if (options.stress_opt || options.stress_deopt) {
       Testing::SetStressRunType(options.stress_opt
                                 ? Testing::kStressTypeOpt
                                 : Testing::kStressTypeDeopt);
       int stress_runs = Testing::GetStressRuns();
@@ skipping 49 matching lines @@
 }
 
 }  // namespace v8
 
 
 #ifndef GOOGLE3
 int main(int argc, char* argv[]) {
   return v8::Shell::Main(argc, argv);
 }
 #endif