Parse harmony let declarations.

src/parser.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 462 matching lines @@
 
   // Check if the given string is 'eval' or 'arguments'.
   bool IsEvalOrArguments(Handle<String> string);
 
   // All ParseXXX functions take as the last argument an *ok parameter
   // which is set to false if parsing failed; it is unchanged otherwise.
   // By making the 'exception handling' explicit, we are forced to check
   // for failure at the call sites.
   void* ParseSourceElements(ZoneList<Statement*>* processor,
                             int end_token, bool* ok);
+  Statement* ParseSourceElement(ZoneStringList* labels, bool* ok);
   Statement* ParseStatement(ZoneStringList* labels, bool* ok);
   Statement* ParseFunctionDeclaration(bool* ok);
   Statement* ParseNativeDeclaration(bool* ok);
   Block* ParseBlock(ZoneStringList* labels, bool* ok);
   Block* ParseScopedBlock(ZoneStringList* labels, bool* ok);
-  Block* ParseVariableStatement(bool* ok);
-  Block* ParseVariableDeclarations(bool accept_IN,
+  Block* ParseVariableStatement(bool accept_LET, bool* ok);
+  Block* ParseVariableDeclarations(bool accept_LET,
+                                   bool accept_IN,
                                    Handle<String>* out,
                                    bool* ok);
   Statement* ParseExpressionOrLabelledStatement(ZoneStringList* labels,
                                                 bool* ok);
   IfStatement* ParseIfStatement(ZoneStringList* labels, bool* ok);
   Statement* ParseContinueStatement(bool* ok);
   Statement* ParseBreakStatement(ZoneStringList* labels, bool* ok);
   Statement* ParseReturnStatement(bool* ok);
   Block* WithHelper(Expression* obj, ZoneStringList* labels, bool* ok);
   Statement* ParseWithStatement(ZoneStringList* labels, bool* ok);
@@ skipping 249 matching lines @@
  private:
   static const int kTypeSlot = 0;
   static const int kElementsSlot = 1;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(CompileTimeValue);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_PARSER_H_