[destructuring] Implement BindingArrayPattern

src/parser.h

 // Copyright 2012 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.
 
 #ifndef V8_PARSER_H_
 #define V8_PARSER_H_
 
 #include "src/allocation.h"
 #include "src/ast.h"
 #include "src/compiler.h"  // TODO(titzer): remove this include dependency
@@ skipping 989 matching lines @@
 #undef DECLARE_VISIT
     virtual void Visit(AstNode* node) override;
 
     void RecurseIntoSubpattern(AstNode* pattern, Expression* value) {
       Expression* old_value = current_value_;
       current_value_ = value;
       pattern->Accept(this);
       current_value_ = old_value;
     }
 
-    Variable* CreateTempVar(Expression* value);
+    Variable* CreateTempVar(Expression* value = nullptr);
 
     AstNodeFactory* factory() const { return descriptor_->parser->factory(); }
     AstValueFactory* ast_value_factory() const {
       return descriptor_->parser->ast_value_factory();
     }
     bool inside_with() const { return descriptor_->parser->inside_with(); }
     Zone* zone() const { return descriptor_->parser->zone(); }
 
     Expression* pattern_;
     int initializer_position_;
@@ skipping 27 matching lines @@
                                       bool* ok);
   Statement* ParseForStatement(ZoneList<const AstRawString*>* labels, bool* ok);
   Statement* ParseThrowStatement(bool* ok);
   Expression* MakeCatchContext(Handle<String> id, VariableProxy* value);
   TryStatement* ParseTryStatement(bool* ok);
   DebuggerStatement* ParseDebuggerStatement(bool* ok);
 
   // Support for hamony block scoped bindings.
   Block* ParseScopedBlock(ZoneList<const AstRawString*>* labels, bool* ok);
 
+  // !%_IsSpecObject(result = iterator.next()) &&
+  //     %ThrowIteratorResultNotAnObject(result)
+  Expression* BuildIteratorNextResult(Expression* iterator, Variable* result,
+                                      int pos);
+
+
   // Initialize the components of a for-in / for-of statement.
   void InitializeForEachStatement(ForEachStatement* stmt,
                                   Expression* each,
                                   Expression* subject,
                                   Statement* body);
   Statement* DesugarLexicalBindingsInForStatement(
       Scope* inner_scope, bool is_const, ZoneList<const AstRawString*>* names,
       ForStatement* loop, Statement* init, Expression* cond, Statement* next,
       Statement* body, bool* ok);
 
@@ skipping 197 matching lines @@
 }
 
 
 Expression* ParserTraits::SpreadCallNew(
     Expression* function, ZoneList<v8::internal::Expression*>* args, int pos) {
   return parser_->SpreadCallNew(function, args, pos);
 }
 } }  // namespace v8::internal
 
 #endif  // V8_PARSER_H_