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diff --git a/v8/test/mjsunit/const.js b/v8/test/mjsunit/const.js
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+// Copyright 2008 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.
+
+// Test const properties and pre/postfix operation.
+function f() {
+  const x = 1;
+  x++;
+  assertEquals(1, x);
+  x--;
+  assertEquals(1, x);
+  ++x;
+  assertEquals(1, x);
+  --x;
+  assertEquals(1, x);
+  assertEquals(1, x++);
+  assertEquals(1, x--);
+  assertEquals(2, ++x);
+  assertEquals(0, --x);
+}
+
+f();
+
+// Test that the value is read eventhough assignment is disallowed.
+// Spidermonkey does not do this, but it seems like the right thing to
+// do so that 'o++' is equivalent to 'o = o + 1'.
+var valueOfCount = 0;
+
+function g() {
+  const o = { valueOf: function() { valueOfCount++; return 42; } }
+  assertEquals(42, o);
+  assertEquals(1, valueOfCount);
+  o++;
+  assertEquals(42, o);
+  assertEquals(3, valueOfCount);
+  ++o;
+  assertEquals(42, o);
+  assertEquals(5, valueOfCount);
+  o--;
+  assertEquals(42, o);
+  assertEquals(7, valueOfCount);
+  --o;
+  assertEquals(42, o);
+  assertEquals(9, valueOfCount);
+}
+
+g();