aa7198dfdd
Legacy const is changed so that a declaration declares a configurable, but non-writable, slot, and the initializer reconfigures it (when possible) to non-configurable non-writable. This avoids the need for "the hole" as marker value in JSContextExtensionObjects and GlobalObjects. Undefined is used instead. BUG= R=rossberg@chromium.org Review URL: https://codereview.chromium.org/379893002 git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22379 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
61 lines
2.8 KiB
JavaScript
61 lines
2.8 KiB
JavaScript
// Copyright 2008 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Check that dynamically introducing conflicting consts/vars
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// is silently ignored (and does not lead to exceptions).
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var caught = 0;
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eval("const a");
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try { eval("var a"); } catch (e) { caught++; assertTrue(e instanceof TypeError); }
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assertTrue(typeof a == 'undefined');
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try { eval("var a = 1"); } catch (e) { caught++; assertTrue(e instanceof TypeError); }
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assertTrue(typeof a == 'undefined');
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eval("const b = 0");
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try { eval("var b"); } catch (e) { caught++; assertTrue(e instanceof TypeError); }
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assertEquals(0, b);
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try { eval("var b = 1"); } catch (e) { caught++; assertTrue(e instanceof TypeError); }
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assertEquals(0, b);
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assertEquals(0, caught);
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eval("var c");
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try { eval("const c"); } catch (e) { caught++; assertTrue(e instanceof TypeError); }
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assertTrue(typeof c == 'undefined');
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assertEquals(1, caught);
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try { eval("const c = 1"); } catch (e) { caught++; assertTrue(e instanceof TypeError); }
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assertEquals(undefined, c);
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assertEquals(2, caught);
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eval("var d = 0");
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try { eval("const d"); } catch (e) { caught++; assertTrue(e instanceof TypeError); }
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assertEquals(0, d);
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assertEquals(3, caught);
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try { eval("const d = 1"); } catch (e) { caught++; assertTrue(e instanceof TypeError); }
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assertEquals(0, d);
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assertEquals(4, caught);
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