Remove support for legacy const, part 1

test/mjsunit/const.js

-// 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.
-
-// Flags: --legacy-const
-
-// 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();