Block scoped const variables.

src/scopes.h

 // 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
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   // Lookup a variable in this scope. Returns the variable or NULL if not found.
   Variable* LocalLookup(Handle<String> name);
 
   // Lookup a variable in this scope or outer scopes.
   // Returns the variable or NULL if not found.
   Variable* Lookup(Handle<String> name);
 
   // Declare the function variable for a function literal. This variable
   // is in an intermediate scope between this function scope and the the
   // outer scope. Only possible for function scopes; at most one variable.
-  Variable* DeclareFunctionVar(Handle<String> name);
+  Variable* DeclareFunctionVar(Handle<String> name, VariableMode mode);
 
   // Declare a parameter in this scope.  When there are duplicated
   // parameters the rightmost one 'wins'.  However, the implementation
   // expects all parameters to be declared and from left to right.
   void DeclareParameter(Handle<String> name, VariableMode mode);
 
   // Declare a local variable in this scope. If the variable has been
   // declared before, the previously declared variable is returned.
   Variable* DeclareLocal(Handle<String> name, VariableMode mode);
 
@@ skipping 357 matching lines @@
   }
 
   void SetDefaults(Type type,
                    Scope* outer_scope,
                    Handle<SerializedScopeInfo> scope_info);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_SCOPES_H_