Remove support for legacy const, part 1

test/mjsunit/global-const-var-conflicts.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.
-
-// Check that dynamically introducing conflicting consts/vars
-// is silently ignored (and does not lead to exceptions).
-
-// Flags: --legacy-const
-
-var caught = 0;
-
-eval("const a");
-try { eval("var a"); } catch (e) { caught++; assertTrue(e instanceof TypeError); }
-assertTrue(typeof a == 'undefined');
-try { eval("var a = 1"); } catch (e) { caught++; assertTrue(e instanceof TypeError); }
-assertTrue(typeof a == 'undefined');
-
-eval("const b = 0");
-try { eval("var b"); } catch (e) { caught++; assertTrue(e instanceof TypeError); }
-assertEquals(0, b);
-try { eval("var b = 1"); } catch (e) { caught++; assertTrue(e instanceof TypeError); }
-assertEquals(0, b);
-assertEquals(0, caught);
-
-eval("var c");
-try { eval("const c"); } catch (e) { caught++; assertTrue(e instanceof TypeError); }
-assertTrue(typeof c == 'undefined');
-assertEquals(1, caught);
-try { eval("const c = 1"); } catch (e) { caught++; assertTrue(e instanceof TypeError); }
-assertEquals(undefined, c);
-assertEquals(2, caught);
-
-eval("var d = 0");
-try { eval("const d"); } catch (e) { caught++; assertTrue(e instanceof TypeError); }
-assertEquals(0, d);
-assertEquals(3, caught);
-try { eval("const d = 1"); } catch (e) { caught++; assertTrue(e instanceof TypeError); }
-assertEquals(0, d);
-assertEquals(4, caught);