tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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instn-local-bndng-let.js (1284B)

      1 // |reftest| module
      2 // Copyright (C) 2016 the V8 project authors. All rights reserved.
      3 // This code is governed by the BSD license found in the LICENSE file.
      4 /*---
      5 description: >
      6    Mutable bindings are created in the lexical environment record prior to
      7    execution for `let` declarations
      8 esid: sec-moduledeclarationinstantiation
      9 info: |
     10    [...]
     11    17. For each element d in lexDeclarations do
     12        a. For each element dn of the BoundNames of d do
     13           i. If IsConstantDeclaration of d is true, then
     14              [...]
     15           ii. Else,
     16               1. Perform ! envRec.CreateMutableBinding(dn, false).
     17    [...]
     18 includes: [fnGlobalObject.js]
     19 flags: [module]
     20 ---*/
     21 
     22 var global = fnGlobalObject();
     23 
     24 assert.throws(ReferenceError, function() {
     25  typeof test262;
     26 }, 'Binding is created but not initialized.');
     27 assert.sameValue(
     28  Object.getOwnPropertyDescriptor(global, 'test262'), undefined
     29 );
     30 
     31 let test262;
     32 
     33 assert.sameValue(test262, undefined);
     34 assert.sameValue(
     35  Object.getOwnPropertyDescriptor(global, 'test262'), undefined
     36 );
     37 
     38 test262 = null;
     39 
     40 assert.sameValue(test262, null, 'binding is mutable');
     41 assert.sameValue(
     42  Object.getOwnPropertyDescriptor(global, 'test262'),
     43  undefined,
     44  'global binding is not effected by modification'
     45 );
     46 
     47 reportCompare(0, 0);