Reject uses of lexical for-loop variable on the RHS.

R=mstarzinger@chromium.org
BUG=v8:2322

Review URL: https://codereview.chromium.org/11031045

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12664 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/parser.cc

@@ -2790,8 +2790,6 @@ Statement* Parser::ParseForStatement(ZoneStringList* labels, bool* ok) {
       if (peek() == Token::IN && !name.is_null()) {
         Interface* interface =
             is_const ? Interface::NewConst() : Interface::NewValue();
-        VariableProxy* each =
-            top_scope_->NewUnresolved(factory(), name, interface);
         ForInStatement* loop = factory()->NewForInStatement(labels);
         Target target(&this->target_stack_, loop);
 
@@ -2799,6 +2797,8 @@ Statement* Parser::ParseForStatement(ZoneStringList* labels, bool* ok) {
         Expression* enumerable = ParseExpression(true, CHECK_OK);
         Expect(Token::RPAREN, CHECK_OK);
 
+        VariableProxy* each =
+            top_scope_->NewUnresolved(factory(), name, interface);
         Statement* body = ParseStatement(NULL, CHECK_OK);
         loop->Initialize(each, enumerable, body);
         Block* result = factory()->NewBlock(NULL, 2, false);
@@ -2838,16 +2838,18 @@ Statement* Parser::ParseForStatement(ZoneStringList* labels, bool* ok) {
         // implementing stack allocated block scoped variables.
         Variable* temp = top_scope_->DeclarationScope()->NewTemporary(name);
         VariableProxy* temp_proxy = factory()->NewVariableProxy(temp);
-        Interface* interface = Interface::NewValue();
-        VariableProxy* each =
-            top_scope_->NewUnresolved(factory(), name, interface);
         ForInStatement* loop = factory()->NewForInStatement(labels);
         Target target(&this->target_stack_, loop);
 
+        // The expression does not see the loop variable.
         Expect(Token::IN, CHECK_OK);
+        top_scope_ = saved_scope;
         Expression* enumerable = ParseExpression(true, CHECK_OK);
+        top_scope_ = for_scope;
         Expect(Token::RPAREN, CHECK_OK);
 
+        VariableProxy* each =
+            top_scope_->NewUnresolved(factory(), name, Interface::NewValue());
         Statement* body = ParseStatement(NULL, CHECK_OK);
         Block* body_block = factory()->NewBlock(NULL, 3, false);
         Assignment* assignment = factory()->NewAssignment(

test/mjsunit/regress/regress-2322.js

+// Copyright 2012 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
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Flags: --harmony-scoping
+
+assertThrows("'use strict'; for (let x in x);", ReferenceError);
+