tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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superclass-generator-function.js (1121B)

      1 // Copyright (C) 2014 the V8 project authors. All rights reserved.
      2 // This code is governed by the BSD license found in the LICENSE file.
      3 /*---
      4 esid: sec-runtime-semantics-classdefinitionevaluation
      5 description: >
      6  IsConstructor check is performed before "prototype" lookup.
      7  Generator functions are not constructors (MakeConstructor is not called on them).
      8 info: |
      9  ClassDefinitionEvaluation
     10 
     11  [...]
     12  5. Else,
     13    [...]
     14    d. Let superclass be ? GetValue(superclassRef).
     15    e. If superclass is null, then
     16      [...]
     17    f. Else if IsConstructor(superclass) is false, throw a TypeError exception.
     18 features: [generators, class, Proxy]
     19 ---*/
     20 
     21 function* fn() {}
     22 
     23 assert.throws(TypeError, function() {
     24  class A extends fn {}
     25 });
     26 
     27 var bound = (function* () {}).bind();
     28 Object.defineProperty(bound, "prototype", {
     29  get: function() {
     30    throw new Test262Error("`superclass.prototype` is unreachable");
     31  },
     32 });
     33 
     34 assert.throws(TypeError, function() {
     35  class C extends bound {}
     36 });
     37 
     38 var proxy = new Proxy(function* () {}, {});
     39 
     40 assert.throws(TypeError, function() {
     41  class C extends proxy {}
     42 });
     43 
     44 reportCompare(0, 0);