[es6] parse destructuring assignment

src/parser.h

Index: src/parser.h
diff --git a/src/parser.h b/src/parser.h
index 9080160c7590f21cce5a7ac3e619e86b60d383f0..f39dccefa0349a7592eb1c1025735582cd692947 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -847,6 +847,8 @@ class ParserTraits {
                                       ZoneList<v8::internal::Expression*>* args,
                                       int pos);
 
+  inline Expression* RewriteDestructuringAssignment(Expression* expr);
+
  private:
   Parser* parser_;
 };
@@ -1074,6 +1076,8 @@ class Parser : public ParserBase<ParserTraits> {
       ForStatement* loop, Statement* init, Expression* cond, Statement* next,
       Statement* body, bool* ok);
 
+  Expression* DesugarDestructuringAssignment(Expression* expr);
+
   FunctionLiteral* ParseFunctionLiteral(
       const AstRawString* name, Scanner::Location function_name_location,
       bool name_is_strict_reserved, FunctionKind kind,
@@ -1278,6 +1282,12 @@ Expression* ParserTraits::SpreadCallNew(
     Expression* function, ZoneList<v8::internal::Expression*>* args, int pos) {
   return parser_->SpreadCallNew(function, args, pos);
 }
+
+
+inline Expression* ParserTraits::RewriteDestructuringAssignment(
+    Expression* expr) {
+  return parser_->DesugarDestructuringAssignment(expr);
+}
 } }  // namespace v8::internal
 
 #endif  // V8_PARSER_H_