Fix a problem with const initialization in the top-level code generator....

src/compiler.cc

 // Copyright 2009 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 870 matching lines @@
 void CodeGenSelector::VisitAssignment(Assignment* expr) {
   // We support plain non-compound assignments to properties, parameters and
   // non-context (stack-allocated) locals, and global variables.
   Token::Value op = expr->op();
   if (op == Token::INIT_CONST) BAILOUT("initialize constant");
 
   Variable* var = expr->target()->AsVariableProxy()->AsVariable();
   Property* prop = expr->target()->AsProperty();
   ASSERT(var == NULL || prop == NULL);
   if (var != NULL) {
+    if (var->mode() == Variable::CONST) {
+      BAILOUT("Assignment to const");
+    }
     // All global variables are supported.
     if (!var->is_global()) {
       ASSERT(var->slot() != NULL);
       Slot::Type type = var->slot()->type();
       if (type == Slot::LOOKUP) {
         BAILOUT("Lookup slot");
       }
     }
   } else if (prop != NULL) {
     ProcessExpression(prop->obj(), Expression::kValue);
@@ skipping 219 matching lines @@
 
 void CodeGenSelector::VisitThisFunction(ThisFunction* expr) {
   // ThisFunction is supported.
 }
 
 #undef BAILOUT
 #undef CHECK_BAILOUT
 
 
 } }  // namespace v8::internal