tor-browser

The Tor Browser
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instn-named-bndng-gen.js (2315B)

      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    Imported binding reflects state of exported generator function binding
      7 esid: sec-moduledeclarationinstantiation
      8 info: |
      9    [...]
     10    12. For each ImportEntry Record in in module.[[ImportEntries]], do
     11        a. Let importedModule be ? HostResolveImportedModule(module,
     12           in.[[ModuleRequest]]).
     13        b. If in.[[ImportName]] is "*", then
     14           [...]
     15        c. Else,
     16           i. Let resolution be ?
     17              importedModule.ResolveExport(in.[[ImportName]], « », « »).
     18           ii. If resolution is null or resolution is "ambiguous", throw a
     19               SyntaxError exception.
     20           iii. Call envRec.CreateImportBinding(in.[[LocalName]],
     21                resolution.[[Module]], resolution.[[BindingName]]).
     22    [...]
     23    16. Let lexDeclarations be the LexicallyScopedDeclarations of code.
     24    17. For each element d in lexDeclarations do
     25        a. For each element dn of the BoundNames of d do
     26           i, If IsConstantDeclaration of d is true, then
     27              1. Perform ! envRec.CreateImmutableBinding(dn, true).
     28           ii. Else,
     29               1. Perform ! envRec.CreateMutableBinding(dn, false).
     30           iii. If d is a GeneratorDeclaration production or a
     31                FunctionDeclaration production, then
     32                1. Let fo be the result of performing InstantiateFunctionObject
     33                   for d with argument env.
     34                2. Call envRec.InitializeBinding(dn, fo).
     35    [...]
     36 
     37    8.1.1.5.5 CreateImportBinding
     38 
     39    [...]
     40    5. Create an immutable indirect binding in envRec for N that references M
     41       and N2 as its target binding and record that the binding is initialized.
     42    6. Return NormalCompletion(empty).
     43 flags: [module]
     44 features: [generators]
     45 ---*/
     46 
     47 assert.sameValue(
     48  g2().next().value,
     49  23,
     50  'binding is initialized to function value prior to module evaluation'
     51 );
     52 
     53 assert.throws(TypeError, function() {
     54  g2 = null;
     55 }, 'binding rejects assignment');
     56 
     57 assert.sameValue(g2().next().value, 23, 'binding value is immutable');
     58 
     59 import { g as g2 } from './instn-named-bndng-gen.js';
     60 export function* g() { return 23; }
     61 
     62 reportCompare(0, 0);