[es6] parse destructuring assignment

src/parser.h

Index: src/parser.h
diff --git a/src/parser.h b/src/parser.h
index 3d907184bce0edf52846d40c7535a166f83d6a08..7b3eea68afe2cdf1e0aca0a9f7753fb7db10d045 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -796,6 +796,8 @@ class ParserTraits {
       const Scanner::Location& params_loc,
       Scanner::Location* duplicate_loc, bool* ok);
 
+  Expression* RewriteDestructuringAssignment(Expression* expression);
+
   void ReindexLiterals(const ParserFormalParameters& parameters);
 
   // Temporary glue; these functions will move to ParserBase.
@@ -1103,6 +1105,8 @@ 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,
       FunctionNameValidity function_name_validity, FunctionKind kind,
@@ -1367,6 +1371,12 @@ void ParserTraits::AddParameterInitializationBlock(
     }
   }
 }
+
+
+inline Expression* ParserTraits::RewriteDestructuringAssignment(
+    Expression* expr) {
+  return parser_->DesugarDestructuringAssignment(expr);
+}
 } }  // namespace v8::internal
 
 #endif  // V8_PARSER_H_