harmony-scoping: Catch variable should be VAR, not LET

R=rossberg@chromium.org
BUG=v8:2858
LOG=N

Review URL: https://codereview.chromium.org/748113003

Cr-Commit-Position: refs/heads/master@{#25503}

src/parser.cc

@@ -2796,9 +2796,7 @@ TryStatement* Parser::ParseTryStatement(bool* ok) {
     Expect(Token::RPAREN, CHECK_OK);
 
     Target target(&this->target_stack_, &catch_collector);
-    VariableMode mode =
-        allow_harmony_scoping() && strict_mode() == STRICT ? LET : VAR;
-    catch_variable = catch_scope->DeclareLocal(name, mode, kCreatedInitialized);
+    catch_variable = catch_scope->DeclareLocal(name, VAR, kCreatedInitialized);
     BlockState block_state(&scope_, catch_scope);
     catch_block = ParseBlock(NULL, CHECK_OK);
 

test/mjsunit/harmony/block-conflicts.js

 // 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:
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
 //
-//     * 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
 
 // Test for conflicting variable bindings.
@@ -175,7 +152,7 @@ for (var v = 0; v < varbinds.length; ++v) {
 
 // Test conflicting catch/var bindings.
 for (var v = 0; v < varbinds.length; ++v) {
-  TestConflict('try {} catch(x) {' + varbinds[v] + '}');
+  TestNoConflict('try {} catch(x) {' + varbinds[v] + '}');
 }
 
 // Test conflicting parameter/var bindings.

test/mjsunit/harmony/regress/regress-2858.js

+// Copyright 2014 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.
+//
+// Flags: --harmony-scoping
+"use strict";
+
+function f() {
+    var y = 1;
+    var q1;
+    var q;
+    var z = new Error();
+    try {
+        throw z;
+    } catch (y) {
+      assertTrue(z === y);
+      q1 = function() { return y; }
+      var y = 15;
+      q = function() { return y; }
+      assertSame(15, y);
+    }
+    assertSame(1, y);
+    assertSame(15, q1());
+    assertSame(15, q());
+}
+
+f();