Disable const in strict mode.

src/parser.cc

 // Copyright 2010 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 1497 matching lines @@
                                          bool* ok) {
   // VariableDeclarations ::
   //   ('var' | 'const') (Identifier ('=' AssignmentExpression)?)+[',']
 
   Variable::Mode mode = Variable::VAR;
   bool is_const = false;
   if (peek() == Token::VAR) {
     Consume(Token::VAR);
   } else if (peek() == Token::CONST) {
     Consume(Token::CONST);
+    if (temp_scope_->StrictMode()) {
+      ReportMessage("strict_const", Vector<const char*>::empty());
+      *ok = false;
+      return NULL;
+    }
     mode = Variable::CONST;
     is_const = true;
   } else {
     UNREACHABLE();  // by current callers
   }
 
   // The scope of a variable/const declared anywhere inside a function
   // is the entire function (ECMA-262, 3rd, 10.1.3, and 12.2). Thus we can
   // transform a source-level variable/const declaration into a (Function)
   // Scope declaration, and rewrite the source-level initialization into an
@@ skipping 3586 matching lines @@
                                    info->is_global(),
                                    info->StrictMode());
     }
   }
 
   info->SetFunction(result);
   return (result != NULL);
 }
 
 } }  // namespace v8::internal