[es6] parse destructuring assignment

src/parser.h

Index: src/parser.h
diff --git a/src/parser.h b/src/parser.h
index 39d0d9278b132fd4dfc5a9ebd104661f1f846205..86c5592399f8a30d57dd491e1ba85f41f517dbbf 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -837,6 +837,8 @@ class ParserTraits {
                                       ZoneList<v8::internal::Expression*>* args,
                                       int pos);
 
+  inline Expression* RewriteDestructuringAssignment(Expression* expr, bool* ok);
+
  private:
   Parser* parser_;
 };
@@ -1064,6 +1066,8 @@ class Parser : public ParserBase<ParserTraits> {
       ForStatement* loop, Statement* init, Expression* cond, Statement* next,
       Statement* body, bool* ok);
 
+  Expression* DesugarDestructuringAssignment(Expression* expr, bool* ok);
+
   FunctionLiteral* ParseFunctionLiteral(
       const AstRawString* name, Scanner::Location function_name_location,
       bool name_is_strict_reserved, FunctionKind kind,
@@ -1292,6 +1296,12 @@ void ParserTraits::DeclareFormalParameter(Scope* scope, Expression* pattern,
         parser_->scanner()->location());
   }
 }
+
+
+inline Expression* ParserTraits::RewriteDestructuringAssignment(
+    Expression* expr, bool* ok) {
+  return parser_->DesugarDestructuringAssignment(expr, ok);
+}
 } }  // namespace v8::internal
 
 #endif  // V8_PARSER_H_