[es6] parse destructuring assignment

src/parser.h

Index: src/parser.h
diff --git a/src/parser.h b/src/parser.h
index 05961414098186770fe538b6c0df619daedd78f4..abc549853e0190464d8b3f3ea393398106270eb6 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -849,6 +849,8 @@ class ParserTraits {
                                       ZoneList<v8::internal::Expression*>* args,
                                       int pos);
 
+  inline Expression* RewriteDestructuringAssignment(Expression* expr);
+
  private:
   Parser* parser_;
 };
@@ -1076,6 +1078,8 @@ 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,
@@ -1280,6 +1284,12 @@ 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_