Sloppy-mode let parsing

src/preparser.cc

 // Copyright 2011 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 <cmath>
 
 #include "src/allocation.h"
 #include "src/base/logging.h"
 #include "src/conversions-inl.h"
 #include "src/conversions.h"
@@ skipping 181 matching lines @@
     case Token::FUNCTION:
       return ParseFunctionDeclaration(ok);
     case Token::CLASS:
       return ParseClassDeclaration(ok);
     case Token::CONST:
       if (allow_const()) {
         return ParseVariableStatement(kStatementListItem, ok);
       }
       break;
     case Token::LET:
-      if (allow_let()) {
+      if (IsNextLetKeyword()) {
         return ParseVariableStatement(kStatementListItem, ok);
       }
       break;
     default:
       break;
   }
   return ParseStatement(ok);
 }
 
 
@@ skipping 673 matching lines @@
 PreParser::Statement PreParser::ParseForStatement(bool* ok) {
   // ForStatement ::
   //   'for' '(' Expression? ';' Expression? ';' Expression? ')' Statement
 
   Expect(Token::FOR, CHECK_OK);
   Expect(Token::LPAREN, CHECK_OK);
   bool is_let_identifier_expression = false;
   if (peek() != Token::SEMICOLON) {
     ForEachStatement::VisitMode mode;
     if (peek() == Token::VAR || (peek() == Token::CONST && allow_const()) ||
-        (peek() == Token::LET && allow_let())) {
+        (peek() == Token::LET && IsNextLetKeyword())) {
       int decl_count;
       Scanner::Location first_initializer_loc = Scanner::Location::invalid();
       Scanner::Location bindings_loc = Scanner::Location::invalid();
       ParseVariableDeclarations(kForStatement, &decl_count,
                                 &first_initializer_loc, &bindings_loc,
                                 CHECK_OK);
       bool accept_IN = decl_count >= 1;
       bool accept_OF = true;
       if (accept_IN && CheckInOrOf(accept_OF, &mode, ok)) {
         if (!*ok) return Statement::Default();
@@ skipping 316 matching lines @@
 
   DCHECK(!spread_pos.IsValid());
 
   return Expression::Default();
 }
 
 #undef CHECK_OK
 
 
 } }  // v8::internal