tor-browser

The Tor Browser
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star-rhs-iter-thrw-violation-rtrn-call-non-obj.js (2170B)

      1 // Copyright (C) 2016 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-generator-function-definitions-runtime-semantics-evaluation
      5 es6id: 14.4.14
      6 description: >
      7  Non-object value returned by iterator `return` method following protocol
      8  violation
      9 info: |
     10  YieldExpression : yield * AssignmentExpression
     11 
     12  1. Let exprRef be the result of evaluating AssignmentExpression.
     13  2. Let value be ? GetValue(exprRef).
     14  3. Let iterator be ? GetIterator(value).
     15  4. Let received be NormalCompletion(undefined).
     16  5. Repeat
     17     a. If received.[[Type]] is normal, then
     18        [...]
     19     b. Else if received.[[Type]] is throw, then
     20        i. Let throw be ? GetMethod(iterator, "throw").
     21        ii. If throw is not undefined, then
     22            [...]
     23        iii. Else,
     24             1. NOTE: If iterator does not have a throw method, this throw is
     25                going to terminate the yield* loop. But first we need to give
     26                iterator a chance to clean up.
     27             2. Perform ? IteratorClose(iterator, Completion{[[Type]]: normal,
     28                [[Value]]: empty, [[Target]]: empty}).
     29 
     30  7.4.6 IteratorClose
     31 
     32  1. Assert: Type(iterator) is Object.
     33  2. Assert: completion is a Completion Record.
     34  3. Let return be ? GetMethod(iterator, "return").
     35  4. If return is undefined, return Completion(completion).
     36  5. Let innerResult be Call(return, iterator, « »).
     37  6. If completion.[[Type]] is throw, return Completion(completion).
     38  7. If innerResult.[[Type]] is throw, return Completion(innerResult).
     39  8. If Type(innerResult.[[Value]]) is not Object, throw a TypeError exception.
     40 features: [generators, Symbol.iterator]
     41 ---*/
     42 
     43 var badIter = {};
     44 badIter[Symbol.iterator] = function() {
     45  return {
     46    next: function() {
     47      return { done: false };
     48    },
     49    return: function() {
     50      return 87;
     51    }
     52  };
     53 };
     54 function* g() {
     55  try {
     56    yield * badIter;
     57  } catch (err) {
     58    caught = err;
     59  }
     60 }
     61 var iter = g();
     62 var caught;
     63 
     64 iter.next();
     65 iter.throw();
     66 
     67 assert.sameValue(typeof caught, 'object');
     68 assert.sameValue(caught.constructor, TypeError);
     69 
     70 reportCompare(0, 0);