Temporal dead zone behaviour for let bindings.

src/heap.cc

 // Copyright 2011 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 4016 matching lines @@
   context->set_global(previous->global());
   return context;
 }
 
 
 MaybeObject* Heap::AllocateBlockContext(JSFunction* function,
                                         Context* previous,
                                         SerializedScopeInfo* scope_info) {
   Object* result;
   { MaybeObject* maybe_result =
-        AllocateFixedArray(scope_info->NumberOfContextSlots());
+        AllocateFixedArrayWithHoles(scope_info->NumberOfContextSlots());
     if (!maybe_result->ToObject(&result)) return maybe_result;
   }
-  // TODO(keuchel): properly initialize context slots.
   Context* context = reinterpret_cast<Context*>(result);
   context->set_map(block_context_map());
   context->set_closure(function);
   context->set_previous(previous);
   context->set_extension(scope_info);
   context->set_global(previous->global());
   return context;
 }
 
 
@@ skipping 2045 matching lines @@
 }
 
 
 void ExternalStringTable::TearDown() {
   new_space_strings_.Free();
   old_space_strings_.Free();
 }
 
 
 } }  // namespace v8::internal