tor-browser

The Tor Browser
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privatefieldset-evaluation-order-1.js (1183B)

      1 // Copyright (C) 2021 André Bargull. All rights reserved.
      2 // This code is governed by the BSD license found in the LICENSE file.
      3 
      4 /*---
      5 description: >
      6  Evaluation order when resolving private fields.
      7 esid: sec-runtime-semantics-keyeddestructuringassignmentevaluation
      8 info: |
      9  13.15.5.6 Runtime Semantics: KeyedDestructuringAssignmentEvaluation
     10    1. If DestructuringAssignmentTarget is neither an ObjectLiteral nor an ArrayLiteral, then
     11      a. Let lref be the result of evaluating DestructuringAssignmentTarget.
     12      b. ReturnIfAbrupt(lref).
     13  2. ...
     14 
     15  9.1.1.3.4 GetThisBinding ( )
     16    1. Assert: envRec.[[ThisBindingStatus]] is not lexical.
     17    2. If envRec.[[ThisBindingStatus]] is uninitialized, throw a ReferenceError exception.
     18    3. ...
     19 
     20 features: [class, class-fields-private]
     21 ---*/
     22 
     23 class C extends class {} {
     24  #field;
     25 
     26  constructor() {
     27    var init = () => super();
     28 
     29    var object = {
     30      get a() {
     31        init();
     32      }
     33    };
     34 
     35    // Accessing |this| should throw a ReferenceError before there's an attempt
     36    // to invoke the getter.
     37    ({a: this.#field} = object);
     38  }
     39 }
     40 
     41 assert.throws(ReferenceError, function() {
     42  new C();
     43 });
     44 
     45 reportCompare(0, 0);