[es6] implement destructuring assignment

src/crankshaft/typing.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/crankshaft/typing.h"
 
 #include "src/ast/scopes.h"
 #include "src/frames.h"
 #include "src/frames-inl.h"
 #include "src/ostreams.h"
@@ skipping 752 matching lines @@
 void AstTyper::VisitThisFunction(ThisFunction* expr) {
 }
 
 
 void AstTyper::VisitSuperPropertyReference(SuperPropertyReference* expr) {}
 
 
 void AstTyper::VisitSuperCallReference(SuperCallReference* expr) {}
 
 
+void AstTyper::VisitRewritableExpression(RewritableExpression* expr) {
+  Visit(expr->expression());
+}
+
+
 void AstTyper::VisitDeclarations(ZoneList<Declaration*>* decls) {
   for (int i = 0; i < decls->length(); ++i) {
     Declaration* decl = decls->at(i);
     RECURSE(Visit(decl));
   }
 }
 
 
 void AstTyper::VisitVariableDeclaration(VariableDeclaration* declaration) {
 }
 
 
 void AstTyper::VisitFunctionDeclaration(FunctionDeclaration* declaration) {
   RECURSE(Visit(declaration->fun()));
 }
 
 
 void AstTyper::VisitImportDeclaration(ImportDeclaration* declaration) {
 }
 
 
 void AstTyper::VisitExportDeclaration(ExportDeclaration* declaration) {
 }
 
 
 }  // namespace internal
 }  // namespace v8