[es6] implement destructuring assignment

src/ast/prettyprinter.cc

Index: src/ast/prettyprinter.cc
diff --git a/src/ast/prettyprinter.cc b/src/ast/prettyprinter.cc
index 00b31168ea5c31c445fff69570f2982ae44a0972..cebe0de015254cb82b01725ca6852576a3a8e230 100644
--- a/src/ast/prettyprinter.cc
+++ b/src/ast/prettyprinter.cc
@@ -13,6 +13,15 @@
 namespace v8 {
 namespace internal {
 
+#define RETURN_IF_FIND_NODE(node) \
+  do {                            \
+    AstNode* tmp = node;          \
+    if (tmp != nullptr) {         \
+      Find(tmp);                  \
+      return;                     \
+    }                             \
+  } while (false)
+
 CallPrinter::CallPrinter(Isolate* isolate) {
   output_ = NULL;
   size_ = 0;
@@ -397,6 +406,11 @@ void CallPrinter::VisitSuperCallReference(SuperCallReference* node) {
 }
 
 
+void CallPrinter::VisitRewritableExpression(RewritableExpression* node) {
+  Find(node->expression());
+}
+
+
 void CallPrinter::FindStatements(ZoneList<Statement*>* statements) {
   if (statements == NULL) return;
   for (int i = 0; i < statements->length(); i++) {
@@ -908,6 +922,11 @@ void PrettyPrinter::VisitSuperCallReference(SuperCallReference* node) {
 }
 
 
+void PrettyPrinter::VisitRewritableExpression(RewritableExpression* node) {
+  Visit(node->expression());
+}
+
+
 const char* PrettyPrinter::Print(AstNode* node) {
   Init();
   Visit(node);
@@ -1659,6 +1678,11 @@ void AstPrinter::VisitSuperCallReference(SuperCallReference* node) {
 }
 
 
+void AstPrinter::VisitRewritableExpression(RewritableExpression* node) {
+  Visit(node->expression());
+}
+
+
 #endif  // DEBUG
 
 }  // namespace internal