Remove support for legacy const, part 1

test/mjsunit/regress/regress-799761.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
-
-// const variables should be read-only
-const c = 42;
-c = 87;
-assertEquals(42, c);
-
-
-// const variables are not behaving like other JS variables when it comes
-// to scoping - in fact they behave more sanely. Inside a 'with' they do
-// not interfere with the 'with' scopes.
-
-(function () {
-  with ({ x: 42 }) {
-    const x = 7;
-  }
-  x = 5;
-  assertEquals(7, x);
-})();
-
-
-// const variables may be declared but never initialized, in which case
-// their value is undefined.
-
-(function (sel) {
-  if (sel == 0)
-    with ({ x: 42 }) {
-    const x;
-    }
-  else
-    x = 3;
-  x = 5;
-  assertTrue(typeof x == 'undefined');
-})(1);
-
-
-// const variables may be initialized to undefined.
-(function () {
-  with ({ x: 42 }) {
-    const x = undefined;
-  }
-  x = 5;
-  assertTrue(typeof x == 'undefined');
-})();
-
-
-// const variables may be accessed in inner scopes like any other variable.
-(function () {
-  function bar() {
-    assertEquals(7, x);
-  }
-  with ({ x: 42 }) {
-    const x = 7;
-  }
-  x = 5
-  bar();
-})();
-
-
-// const variables may be declared via 'eval'
-(function () {
-  with ({ x: 42 }) {
-    eval('const x = 7');
-  }
-  x = 5;
-  assertEquals(7, x);
-})();