95145fa826
This patch moves the semantics of 'const' in sloppy mode to match those in strict mode, that is, const makes lexical (let-like) bindings, must have an initializer, and does not create properties of the global object. R=adamk LOG=Y BUG=v8:3305 CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel Review URL: https://codereview.chromium.org/1571873004 Cr-Commit-Position: refs/heads/master@{#33218}
87 lines
1.6 KiB
JavaScript
87 lines
1.6 KiB
JavaScript
// Copyright 2015 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --harmony-sloppy --harmony-sloppy-let --harmony-sloppy-function
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// Flags: --legacy-const
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// Legacy-const-let conflict in a function throws, even if the legacy const
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// is in an eval
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// Throws at the top level of a function
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assertThrows(function() {
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let x = 1;
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eval('const x = 2');
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}, TypeError);
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// If the eval is in its own block scope, throws
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assertThrows(function() {
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let y = 1;
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{ eval('const y = 2'); }
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}, TypeError);
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// If the let is in its own block scope, with the eval, throws
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assertThrows(function() {
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{
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let x = 1;
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eval('const x = 2');
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}
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}, TypeError);
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// Legal if the let is no longer visible
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assertDoesNotThrow(function() {
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{
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let x = 1;
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}
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eval('const x = 2');
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});
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// In global scope
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let caught = false;
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try {
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let z = 1;
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eval('const z = 2');
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} catch (e) {
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caught = true;
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}
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assertTrue(caught);
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// Let declarations beyond a function boundary don't conflict
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caught = false;
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try {
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let a = 1;
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(function() {
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eval('const a');
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})();
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} catch (e) {
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caught = true;
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}
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assertFalse(caught);
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// legacy const across with doesn't conflict
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caught = false;
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try {
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(function() {
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with ({x: 1}) {
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eval("const x = 2;");
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}
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})();
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} catch (e) {
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caught = true;
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}
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assertFalse(caught);
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// legacy const can still conflict with let across a with
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caught = false;
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try {
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(function() {
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let x;
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with ({x: 1}) {
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eval("const x = 2;");
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}
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})();
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} catch (e) {
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caught = true;
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}
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assertTrue(caught);
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